Memorex | MPH-6929 | inTRS -80 Personal Computers

inTRS -80 Personal Computers
Popular Electronics
WORLD'S LARGEST SELLING ELECTRONICS MAGAZINE
APRIL 1982/$1
Adapt a Turntable to Play 78 -rpm Collector Records
How to Eliminate Data Loss
inTRS -80 Personal Computers
DIGITAL MEMORY
DEVICE CONVERTS
A STANDARD
OSCILLOSCOPE INTO
A STORAGE SCOPE
OZ9PT
2131S3H00è
IS N3aNI1
dOd2lO SAS
£$nî
1111
40 24 14278
OTbO
111
13313 21311IW
260`15490
2l311IW d
71W
SLS
d _
2lW
88S98S' this
s
s
issue:
"Phoenix" 19" Color TV Receiver
Pioneer CT-BR Cassette Deck
Intelligent Systems Video Display Terminal
Make waves with an Apple.
If you'd like to spend more of your research budget on
research and less on computer costs, consider the discoveries
of Dr. John Lilly and the Human /Dolphin Foundation.
Dolphins vocalize at 2,000 - 40,000 Hz (compared with
300 -3,000 Hz for humans) and `converse" 10 -15 times faster
than their bipedal brethren.
In 1968, Dr. Lilly's interspecies communication experiments stalled for lack of affordable computer power to bridge
this gap. But today, with the help of Apple Personal Computers
and a DEC`` PDP/11, things are going swimmingly.
A new program called JANUS (JointAnalog Numeric
Understanding System) uses a 48K Apple II Plus to generate
dolphin- comprehensible wave forms matched to dolphin-
viewable symbols on an underwater
screen. Dolphin responses are analyzed
through a PDP/11. A second Apple
monitors and analyzes data from all
phases of the experiment.
The objective is to create an
artificial language that is mutually
intelligible to both species, with
a beginning vocabu ary of 48 sound/symbol morphemes
associated with objects, locations and actions.
But, with all the micros available, why pick Apples?
Because they're inexpensive enough to allow the use
of a stand -alone computing system for dedicated functions.
Because they're portable and rugged enough for
field use in a wide range of environments.
And because they can be configured for many scientific
APPLE
APPLE
applications with no special I/O
Maximum
devices. (Apple's IEEE-488 interI/O
expansion
+
expansion
built interfaces
and printer.
face card will program and
Drives
+ up
Up
floppies.
additional floppies.
operate virtually any test, measAvailable with ProFile"
hard
urement or control instrument.)
Languages
BASIC,
Enhanced
Pascal'
COBOL,
There's more software
programmable
Keyboard
96-character
available for Apples than for
ASCII.
character, includes
numeric keypad.
any other microcomputer on
the market. And more full service dealers worldwide.
Communicate with one and find out how an Apple
can make waves for you, whatever your, ah ... porpoise.
II
RAM
III
256K
64K
slots
8
4
slots
for
-in
disks
Disk
to 6 140K
Built -in 140K
to
3
5MB
Pascal,"
PILOT,
Assembly.
Fixed
disk.
BASIC,
U C SD
Assembly.
Fully
128-
The personal computer.
Sappia
The Human/Dolphin Foundation is a non -profit research organization, For more information, write Dr John Lilly, P.O. Box 4172, Malibu, CA 90265.
For the authorized Apple dealer nearest you, call (8001538-9696. In California, call (800)662-9238. Or write: Apple Computer Inc., 10260 Bandley Dr., Cupertino, CA 95014.
CIRCLE
NO
6
ON
FREE
INFORMATION
CARD
APRIL 1982
We Beat
All Prices!
I
-
v
1
1. --
tunics
Feature Articles
AIMMOINMiiii
Woo
$1989
Your Choice -NEW HP- 87.... CALL
--oirrr`.f
5V." Dual Master Disk Drive
8" Dual Master Disk Drive
CALL
CALL
5meg WINCHESTER Hard Disk
5meg WIN. w151/4 DSDD floppy
$3599
$4399
APPLE
APPLE
CALL
CALL
II
Popular
20, NUMBER 4
WORLDS LARGEST-SELLING ELECTRONICS MAGAZINE
HEWLETT,,.,
Cn/11 PACK14RO
HP -85
or
HP -125
VOLUME
PLUS, 48K
III
TI 9914
$367
$255
$989
$2489
$3095
COMMODORE VIC-20
NEC PC- 8001 -A, 32K
,;EROX 820 53/4" Disk Drives
XEROX 820 8" Disk Drives
/Fredrick
/James E Lindensmith
LEARNING QUIZZES FOR ELECTRONICS
DOWN THE TUBE
W.
57
106
Hughes
Construction Articles
Wang and Dennis Murphy_.
Store waveforms on your oscilloscope for approximately $228.
43
DISTINCTIVE EXTENSION PHONE RING TO YOUR TELEPHONE /Mark
56
ADD WAVEFORM STORAGE TO YOUR OSCILLOSCOPE /Jonathan
ADD
A
BUILD A SYNCHRONOUS DETECTOR FOR AM RADIO /Dave
Forbes
61
Hirschberger
Improves frequency response and removes distortion.
CHARGE TWO CAR BATTERIES AT ONCE /Charles Cohn
Speeds up charging time of lead -acid batteries.
76
77
/Raymond Bintliff
Adapt your turntable to rotate at 78 rpm.
ELIMINATE DATA LOSS IN YOUR TRS-80/ Robert E. Wilson
Simple circuit addition will avoid outages due to line disturbances.
78 -RPM RECORDS LIVE AGAIN!
81
TI CALCULATORS
TIP-55-II
TIP -Business Analysis II
TIP -58C
TIP -59
TIP- P -100C
$36
$36
$79
8169
$149
HP -41CV with five times more
memory built in.
HP-41C
List $325
List $250
$249
$189
HP-41CV Printer
HP-41CV Quad Memory
HP-41CV CardReader
HP82160A HP -IL Module
HP82161A Digital Cassette
HP11C
HP12C
HP33C
HP34C
Drive....
ATARI °800
1
..,..,lull
$289.00
$83.95
$167.95
$99.00
$449.00
$107.95
$119.95
$74.95
$117.95
$689
will
r,n,i ,I litt
Equipment Reviews
COLOR "PHOENIX" CHASSIS
SANWA MODEL LCD -900 MULTITESTER
31
41
SONY MODEL ICF -2001 RECEIVER FOR AM -FM BROADCAST AND SHORTWAVE
97
INTELLIGENT SYSTEMS MODEL 3651 MICROCOMPUTER SYSTEM
Columns
ENTERTAINMENT ELECTRONICS /Len Feldman
Audio Goes Digital in Las Vegas.
20
COMPUTER BITS /Carl Warren
38
Training Tools and System Add-Ons.
83
88
94
COMPUTER SOURCES /Leslie Solomon
HOBBY SCENE /Leslie
Solomon
/Forrest M. Mims
Mercury, Vacuum. and Solid -State Pressure Sensors.
SOLID -STATE DEVELOPMENTS
EXPERIMENTER'S CORNER /Forrest M. Mims
100
How to Protect Profitable Ideas.
Part 2. Notebooks, Lawyers and Patent Applications.
PROJECT OF THE MONTH /Forrest M. Mims
107
Event -Failure Alarm.
_
___
as,
.Uofa
U.30).
1U
AL
,
VVUV-c,..-
ATARI'
Departments
EDITORIAL /Art Salsberg
ATARI 400
$349
Atari 830 Acoustic Modem
Atari 825 80 Col. Impt. Ptr
Atari 410 Prog. Recorder
Atari 810 Disk Drive
$145
$565
$69
$419
rs o n a I
8
NEW PRODUCTS
ELECTRONICS LIBRARY
NEW LITERATURE
OPERATION ASSIST
ADVERTISER'S INDEX
PERSONAL ELECTRONICS NEWS
87
89
104
105
20
26
1
1
COVER PHOTO BY JAY BRENNER Copyright a 1982
WAVEFORM BY JACK WARD COLOR SERVICES, INC
omputar
SystQms
P.O. Box 1073
Syracu se, N.Y.13201
(315) 475-6800
(800) 448-5259
6
Looking Backward.
TIPS AND TECHNIQUES
For Placing Orders Only
Prices do not include shipping bt UPS. All prices and
offers are subject to change without notice
2
25
29
PIONEER MODEL CT-8R CASSETTE DECK
MAGNAVOX 19
CIRCLE NO. 39 ON FREE INFORMATION CARD
COPYRIGHT o 1982 BY ZIFF -DAVIS PUBLISHING COMPANY. All rights reserved. Popular Electronics (ISSN 0032 -4485) April
1982, Volume 20, Number 4. Published monthly by Ziff -Davis Publishing Co., at One Park Ave., New York, NY 10016. Richard P.
Friese, President; Selwyn Taubman, Treasurer; Bertram A. Abrams, Secretary. One year subscription rate for U.S. and Possessions, $15.00; Canada, $20.00; all other countries, $23.00 (cash orders only, payable in U.S. currency). Second Class Postage
Paid at New York, N.Y. 10016 and at additional mailing offices. Authorized as second class mail by the Post Office Dept., Ottawa,
Canada, and for payment of postage in cash. POPULAR ELECTRONICS including ELECTRONICS WORLD, Trade Mark Registered.
Indexed in the Reader's Guide to Periodical Literature. Ziff -Davis also publishes Boating, Car and Driver. Cycle, Flying, Popular
Photography, Skiing, Stereo Review, Electronic Experimenter's Handbook, and Tape Recording 8 Buying Guide. Forma 3579 and
all Subscription Correspondence: POPULAR ELECTRONICS. Circulation Dept. P.O. Box 2774, Boulder, CO 80302. Please allow
at least eight weeks for change of address, enclosing, it possible, an address label from a recent issue. Permissions. Material in
this publication may not be reproduced in any form without permission. Requests for permission should be directed to John
Babcock, Rights and Permissions, Ziff-Davis Publishing Co., One Park Ave., New York, NY 10016.
POPULAR ELECTRONICS
TEK
THE PERFORMANCE/
PRICE STANDARD
DUAL TRACE OSCILLOSCOPES
Introducing a direct line
to a 60 MHz Tektronix scope
built for your bench!
From the world's most
respected name in oscilloscopes: a new scope,
plus a new direct order
number, that finally
makes it practical to put
Tektronix quality on your
bench... at work or home.
Among professional engineers and technicians
there is no substitute for the
performance and reliability
of Tektronix oscilloscopes.
Now, for the first time,
Tektronix is offering an advanced scope at an unprecedented low price
and has a direct order line
that lets you get your order
processed today!
-
The scope: the 2213.
Its radical new design
brings you Tektronix
quality for well below
what you would pay for
lesser-name scopes.
The 2213's practical de-
sign includes 65% fewer
mechanical parts, fewer
circuit boards, electrical
connectors and cabling.
Result: a lower price for you
plus far greater reliability.
Yet
Tektronix: there's 60 MHz
bandwidth for digital and
high -speed analog circuits.
The sensitivity for low signal
measurements. The sweep
speeds for fast logic families
A complete trigger system
for digital, analog or video
waveforms. And new high performance Tektronix
probes are included!
2213 PERFORMANCE
DATA
Bandwidth: Two channels,
-60
do
MHz from 10 V /div
to 20 mV/div. (50 MHz from
'Price F.O.B. Beaverton. OR
Copyright ©1982 Tektronix, Inc. All rights reserved
APRIL 1982
performance
is pure
121
2 mV
div to 10 mV/div).
Sweep speeds: Sweeps
from 0.5 s to 50 ns (to 5
ns /div with X10 mag).
Sensitivity: Scale factors
from 100 V /div (10X probe)
to 2 mV/div (1X probe). Accurate to ± 3 %. Ac or dc
coupling.
Delayed sweep measurements: Standard
sweep, intensified after
delay, and delayed.
(Need dual time -base
performance and timing
accuracy to ± 1.5%? Ask
about our 2215 priced at
$1400.)
Complete trigger system:
Modes include TV field,
normal, vertical mode, and
automatic; internal, external, and line sources; variable holdoff.
Probes: High perform-
ance, positive attachment,
10 -14 pF and 60 MHz at the
probe tip.
The price: Just $1100
complete *. Order direct
from Tektronix National
Marketing Center. Phones
are staffed by technical
people to answer your
questions about the 2213.
Your direct order includes a
15 -day return policy and full
Tektronix warranty
Now it's easier than
ever to get your hands on
a Tek scope!
ORDER TOLL -FREE
800 -547-1845
Ask for Department 100
(In Oregon, Alaska and
Hawaii: 1- 503-627 -5402
collect.) Lines are open
from 8 am EST to 5 pm PST.
Téktronix
l'1IMMI11E111flExf:F11F.Nf,F
3
Introducing
the Sinclair ZX81
If you're ever going to buy
personal computer, now is the
time to do it.
The new Sinclair ZX81 is the
most powerful, yet easy -to -use
computer ever offered for anywhere
near the price: only $149.95* completely
assembled.
Don't let the price fool you. The
ZX81 has just about everything you
could ask for in a personal computer.
a
A breakthrough
in personal computers
The ZX81 is a major advance over
the original Sinclair ZX80 -the world's
largest selling personal computer and
the first for under $200.
In fact, the ZX81's new 8K Extended
BASIC offers features found only on computers costing two or three times as much.
Just look at what you get:
Continuous display, including moving
graphics
Multi-dimensional string and numerical
arrays
Plus shipping and handling. Price includes connectors
for TV and cassette. AC adaptor. and FREE manua
NEW SOFTWARE:Sinclair has
published pre-recorded programs on cassettes for your
ZX81, or ZX80 with 8K BASIC.
We're constantly coming out
with new programs, so we'll
send you our latest software
catalog with your computer.
Mathematical and scientific functions
accurate to 8 decimal places
Unique one-touch entry of key words
like PRINT, RUN and LIST
Automatic syntax error detection and
easy editing
Randomize function useful for both
games and serious applications
Built -in interface for ZX Printer
1K of memory expandable to 16K
The ZX81 is also very convenient
to use. It hooks up to any television set
to produce a clear 32-column by 24 -line
display. And you can use a regular
cassette recorder to store and recall
programs by name.
ZX PRINTER: The Sinclair ZX
Printer will work with your ZX81,
or ZX80 with 8K BASIC. It will
be available in the near future
and will cost less than $100.
If you already own a ZX80
The 8K Extended BASIC
chip used in the ZX8' is available
as a plug -in replacement for your
ZX80 for only $39.95, plus shipping
and handling-complete with new keyboard overlay and the ZX81 manual.
So in just a few minutes, with no
special skills or tools required, you can
upgrade your ZX80 to have all the
powerful features of the ZX81. (You'll
have everything except continuous display, but you can still use the PAUSE
and SCROLL commands to get moving
graphics.)
With the 8K BASIC chip, your
ZX80 will also be equipped to use the
ZX Printer and Sinclair software.
Warranty and Service Program **
The Sinclair ZX81 is covered by a
10 -day money -back guarantee and a
limited 90-day warranty that includes free
parts and labor through our national
service -by -mail facilities.
*
*Does not apply to ZX81 ki*s.
16K MEMORY MODULE:
Like any powerful, full fledged
computer, the ZX81 is expandable. Sinclair's 16K memory
module plugs right onto the
back of your ZX81 (or ZX80,
with or without 8K BASIC).
Cost is $99.95, plus shipping
and handling.
ZX81 MANUAL: The Z(81
comes with a comprehensive
164 -page programming guide
and operating manual designed for both beginners and
experienced computer users.
A $10.95 value, it's yours free
with the ZX81.
Introducing
the ZX8'i kit
If you really wart to
save money, anc you enjoy
building electronic kits. you
can order the Zh ".81 in kit fo-m
for the incredible price of just
$98..95' It's the same, full -featured
computer, only you pu' it together
yourself. We'll send complete, easy to-follow instructions on how you can
assemble your ZX81 in just a few hours.
All you have to supply is the soldering iron.
How to order
Sinclair Research is tie world's ia-gestmanufacturer of personal compute -s.
The ZX81 represents the latest
technology in microelectronics, and it
picks up right where the ZÁ.80 left off.
Thousands are settling every week.
We urge you to place your order
for the new ZX81 today. The sooner you
order, the sooner you can start e'ijoying
your own computer.
To order, simply call our loll free
number, and use your MasterCard or VISA.
To order by mail,, please Jse the
moon. And serdd your check or money
order. We regret that we cannot accep*
purchase orders or C.O.D:s.
AD CODE
`.11
-.
CALL 800-543- 300C. As for operator #509. In Ohio call 800-582-1364.
In Canada call 513-729-4300. Ask for
operator #509. Phones open 24 hours
a day, 7 days a week. Have your Master,
Card or VISA ready.
These numbers are for orders
only. For information, you must write to
Sinclair Research Ltd., One Sinclair Plaza,
Nashua, NH 03061.
5ü1-1Cair
ZX81
$149.95
ZX81 Kit
99.95
8K BASIC chip (for ZX80)
39.95
16K Memory Module (for ZX81 or ZX80)
99.95
Shipping and Handling
4.95
'
------
[t;
/
//
PRICEt
PE
r
i/lk---'---
To
QTY.
AMOUNT
$4.95
ship outside USA add $10.00
TOTAL
MAIL TO: Sinclair Research Ltd., One Sinclair Plaza, Nashua, NI- 03061.
NAME
ADDRESS
CITY /STATE /ZIP
t U.S. Dollars
EDI1OR1PL
Looking Backward
A small percentage of laboratory -brew
developments wend their way into successful
consumer products. Merit alone is not
enough, however. Risk capital, backed by
corporate courage and the profit motive, are
the real driving forces. Even these do not
assure success, though. A new product also
faces a fickle public's acceptance.
Consumer video machines could serve
well as a business management lesson. Industrialists and media experts touted the
concept for almost a generation, but only
now are tasting success. I authored a cover
story in September 1965, for example, that
trumpeted, "Home Video Tape Recorders
Are Here!" All the right forces were combined, it seemed. Sony even incorporated a
9 "- screen TV set into its unit. The price barrier of $3000+ was broken, with a round
$1000 displacing it. Companies such as
Sony, Panasonic, and Ampex had thrown
their hats into the video ring, and there was
talk of a $10- million first year in sales, with
$100 -million within five years. Rumors were
rampant that other companies would soon
enter the field -RCA, 3M, Rheem, Del monico, among them. Notwithstanding this,
it did not fly. The public evidently did not
accept the absence of color -TV capability,
there were no prerecorded tape companies
beating the drum, every entry used a differ-
Popular Electronics
JOE MESICS
Publisher
ARTHUR P. $ALSKRO
Editorial Director
DONALD NOME
Executive Editor
LESLIE SOLOMON
Technical Director
JOHN R. moos
Managing Editor
EDWARD I.SUXSAUM
Art Director
JOSEPH DSSPOSITO
Technical Editor
DAVID M. WESER
Features Editor
ANDRE DUSANT
Technical Illustrator
CARMEN ROBLES
Production Editor
JEFF NEWMAN
Editorial Assistant
Contributing Editors:
wan.r B
baum.
Carl Wann, Stan Prentiss. Glenn Haus.r,
Julian Hirsch, Porv.st Mims, Lon P.Idman
MARIE MAESTRI
Executive Assistant
6
ent system, video tape was reel -to-reel, and
the $1000 price tag in 1965 was too high.
Five years later, play -only systems were
introduced including a film system called
Electronic Video Recording (EVR) from
CBS, RCA's "Selecta Vision" video disc
with 30 minutes play time, and A.E.G. Telefunken and Decca (Teldec) with a 12 -minute -play time "Video Disc." At the same
time, Avco demonstrated its "Cartrivision"
video recording machine with color TV
capability, and Ampex also introduced a
cartridge machine called "Instavision."
About five years later, companies got
their acts together and the present Beta and
VHS tape systems were marketed. In another five years, RCA's CED and Philips'
LaserVision disc systems reached the marketplace, with a VHD system expected later
in 1982. All are incompatible, of course.
But it appears that we are off and running
very well with all the machines marketed
today. In fact, they're selling better than
color TV receivers did in a comparable number of years after their introduction.
Not surprising, the rise of video recorders
has taken its toll of 8 -mm movie cameras,
whose sales have been more than halved as
more and more people have turned to VCRs.
This trend promises to continue.
There are other video products and refine-
Editorial and Executive Offices
One Park Avenue
New York, New York 10016
212 725 -3500
Publisher
Joe E. Mesics
212 725 -3568
New York Office
Advertising Manager:
Richard Govatski (725 -7460)
Sales:
Tom Ballou (725 -3578)
Ken Lipka (725 -3580)
Midwestern Office
Suite 1400, 180 N. Michigan Ave.,
Chicago, IL 60601 (312 346 -2600)
Sales: Ted Welch
Western Representative
Norman S. Schindler & Associates, Inc.
7050 Owensmouth Ave., #209
Canoga Park, CA 91303 (213 999 -1414)
Sales: Norm Schindler
Representation In Japan
J. S. Yagi
Iwai Trading Co., Ltd.
603 Ginza Sky Heights Bldg.
18 -13, Ginza 7 -Chome
Tokyo, Japan 104
ments that will reach the public in the
future. Looking back at what transpired can
be helpful in avoiding mistakes. To sustain
the growth of video disc machines, it's clear
prices will have to be reduced further to
attract more people. Doubtlessly, this will
occur, particularly with the CED play -only
machine, as it is really a very simple design.
Furthermore, discs hold the promise for
much lower cost since they can be produced
more expeditiously than can tape. The
recording facility of the latter as well as the
rental of prerecorded tapes will carry the
day for tape machines, though.
Down the road you may look for tape
recording facilities that are incorporated
into video cameras, which would likely
sound the death knell for 8 -mm movie cameras. And you will certainly be able to get
stereo -sound TV at some future time. I hope
that the quality of sound that becomes available once a system is chosen from among
those submitted to the FCC is "high- fidelity." After all, there's more to hi-fi than a
50- to- 15,000 -Hz frequency range.
Ziff-Davis Publishing Company
Richard P. Friese
President
Albert S. Traina
President, Consumer
Magazine Division
Furman Hebb
Executive Vice President
Phillip T. Heffernan
Senior Vice Presidents
Sidney Holtz
Edward D. Muhlfeld
Philip Sine
Vice Presidents
Robert Bavier
Baird Davis
George Morrissey
Selwyn Taubman
Treasurer
Bertram A. Abrams
Secretary
Editorial correspondence: POPULAR ELECTRONICS,
I Park Ave., New York, NY 10016. Editorial contributions
must be accompanied by return postage and will be handled
with reasonable care; however, publisher assumes no responsibility for return or safety of manuscripts, art work, or
models submitted.
The publisher has no knowledge of any proprietary rights
which will be violated by the making or using of any items
disclosed in this issue.
ABC
Member Audit Bureau
of Circulations
Q
POPULAR ELECTRONICS
Let us
show you how to
shoot video like a pro
In my videotape production company, our crews turn out
award- winning commercials, sales films, and features for
some of the largest companies and television networks in the
country. Now we would like to share our vast experience and
award- winning capabilities to help you shoot your video with
a professional -quality look- through an exciting new concept
called VC 2000 An Association of Video Camera Owners.
Now, for a limited time, only when you join VC 2000,
I'll send you FREE our one -hour instructional tape
"Shooting Home Video: The Basics."
There's nothing like it on the market. In an entertaining, step by-step format, our directors, cameramen, engineers and
editors share their trade secrets. This could be the most valuable videotape a video enthusiast could ever own ... and
open up possibilities you never thought possible.
In one hour, I can demonstrate more techniques than
you'd get from reading a dozen books.
You'll learn:
THE VIDEO CAMERA: How to use its full potential to make
your tapes really come alive.
VIDEO SOUND: Get clean, true sound under every shooting
situation.
VIDEO LIGHTING: Achieve that distinctive professional
look, inside and outside.
A library of other professionally -produced instructional
videotapes at special member prices, like:
HOW TO SHOOT A WEDDING
HOW TO SHOOT A SPORTS EVENT
HOW TO SHOOT FAMILY VIDEO "ALBUMS"
PLUS MANY MORE
FREE quarterly newsletter with state -of- the -art developments in the world of video.
Discount prices on blank cassettes and equipment.
Don't miss out on this exciting introductory offering. Send
in this coupon and your check today. Or use our toll -free
number for further information, or to charge your membership to your VISA or MasterCard account. Offer ends
June 30, 1982.
All this for
only $90.00
P.S. Before you buy a video
Jim Kartes, Kartes Video Communications, Inc.
camera or recorder, call us first.
E Please send me my VC 2000 membership card and
FREE "Shooting Home Video: The Basics"
60-minute instructional tape.
I
will need:
VHS Cassette
BETA
II
D
Cassette
NAME
ADDRESS
VIDEO COMPOSITION: Apply the five artistic guidelines for
winning composition.
VIDEO DIRECTING: Think like a director, utilizing the principles of continuity, to make the simplest situation a story.
CITY
STATE
_ZIP
Also send me the program: "HOW TO SET UP YOUR OWN
VIDEOTAPE BUSINESS" at the discount price of $45.*
reside0 n add
Enclosed is my check for
$90.00
$135.00 (M
51.8 sales taxts )
Bill my
VISA or
MasterCard account. My account
Plus...look at all the other great member benefits you'll
number is
get with this introductory offer to join VC 2000
A five year membership card.
A $20 discount on our instructional videotape "How to Set
Up Your Own Video Business."
Learn about possible tax advantages of working for yourself in the
exciting videotape production business...the services you can
offer and how to sell them.
Expires
Signature
do not presently own a videotape camera but am interested
in more information on VC 2000. For further information in a
hurry, call toll -free: 1- 800 -428 -6163 (except in Alaska or Hawaii),
1-800-692-604.8 (in Indiana).
VC 2000
TM
10 E. 106th St.
Indianapolis, Indiana
;
46280
ElI
L
7
INN
Programmable DMM
NCW
P
Additional information on new products
covered in this section is available from the
manufacturers. Either circle the item's code
number on the Free Information Card
or write to the manufacturer at the
address given.
Numeric Keypad for
Apple Il
The Hewlett -Packard Model 3468A is a
five- function 31/2- to -51/2-digit multimeter
that offers the new Hewlett- Packard Interface Loop (HP -IL). HP -IL is a two wire serial interface bus intended for
field-portable and simple bench -top systems using portable controllers such as the
HP 41C or HP 41CV handheld calculators. (A thermal printer can also be
included in the loop.) The multimeter
itself features an integrating multi -slope
A-to -D converter that permits the tradeoff of reading speed for resolution. The
user can, from the front panel or remotely,
increase resolution from 31/2 to 51/2 digits,
but reading speed is reduced by a factor of
about ten. The HP 3468A has four full-
The Keyboard Company's Numeric Keypad is designed for use with the Apple II
computer. One section of the unit is dedicated for arithmetic calculations. It has a
standard keypad with double zero and
decimal point, as well as operator keys for
parenthesis, print, return, and the four
basic arithmetic functions. The other section inputs Visicalc commands using three
keys to control cursor movement: two for
directional control, and a third to change
cursor horizontal movement to vertical.
Holding down either directional movement key initiates the auto -repeat mode,
scale ac ranges from 0.3 V to 300 V. The
ac accuracy at mid -range is given as
0.25%. Dc voltage is measured in four
ranges from 30 mV to 300 V. Accuracy is
0.008%. Resistance encompasses six full scale ranges from 300 ohms to 30 megohms, and one additional range down to
30 ohms. Resistance accuracy is 0.004%.
The unit has one 3 -A dc current range and
two ac current ranges: 0.3 and 3.0 A.
Bandwidth for the HP 3468A is 20 Hz to
300 kHz; crest factor is 4.1 at full scale.
The multimeter also features electronic
calibration with self -test; a 12- character,
14-segment alphanumeric LCD with 12
annunciators; and a single -piece silicone
rubber keyboard. $695.
CIRCLE NO.89 ON FREE INFORMATION CARD
which moves the cursor across the screen
until the key is released. A fourth key deletes entries. The keypad is coordinated
with the Apple in color and design. Cost,
with interface board, cord and directions,
is $150.
Video Color Camera
with Nikon Lens
CIRCLE NO. 87 ON FREE INFORMATION CARD
100-dB S/N Tape Recorder
The TEAC X -1000R open -reel tape deck
is reported to have a S/N of 100 dB
through use of its built -in dbx noisereduction system and the new Extra Efficiency tapes that the recorder can handle.
The transport system uses dual -capstan,
closed -loop drive, with full- tension servo
8
control. Bidirectional record and playback
facilities are included, using a six -head
arrangement. Reel sizes up to 101/2" can
be accommodated. Transport functions
are handled through a logic system that
also permits "Search to Zero," "Search to
Cue," and "Block Repeat" operations. A
five -digit linear counter reads directly in
hours, minutes, and seconds. An "AutoSpacer" function is claimed to ensure
noiseless, evenly timed transitions between recorded selections. Also included
are adjustable pitch control and switch able external timer activation for either
play or record modes, wide -range VUtype meters, full mic /line mixing, and
separate -channel input and output controls. At 71/2 ips, overall frequency range
is given as 30 to 34,000 Hz with wow and
flutter at 0.03%. At 33/4 ips, the range is
from 30 to 24,000 Hz, with wow and flutter at 0.04 %. $1400.
CIRCLE NO. 88 ON FREE INFORMATION CARD
The IK -1900 from Toshiba is the first video camera to incorporate a Nikon lens.
The camera features a viewing system,
called Tru Image, claimed to permit a
user to see almost 100% of a scene, rather
than a black- and -white electronic image..
The system is said to eliminate the need
for split- screen focusing by blurring the
entire image when the camera is out of
focus. The lens (Nikkor 12.5 mm-100
mm) includes a motorized 8X zoom. A
balance adjustment permits user control
of indoor and outdoor tint; and a boomPOPULAR ELECTRONICS
NEW HIGHER PRINTING SPEED,
NEW LOWER PRINTER PRICE
High -speed printer
Low -priced printer
The Heath /Zenith 25 Printer is a heavy -duty, high -speed
dot matrix printer that gives you sharp, clear printouts. It
prints crisp, clear copy at speeds over 150 characters per
second with quiet smoothness.
Baud rates from 110 to 9600 are user -selectable.
The 25 has all the features you've been looking for in a high
quality, high -speed dot matrix printer for only $1095 in kit
form, or for only $1595 assembled and tested.
Versatile printer
Pick the store nearest you from the list below. And stop in
today for a demonstration of the new Heath /Zenith 25 Printer.
If you can't get to a store, send $1.00 for the latest Zenith
Data Systems Catalog of assembled commercial computers.
We'll also send you a free copy of the latest Heathkit®
catalog. Write to Heath Company, Dept. 010 -884, Benton
Harbor, MI 49022
-
Free demonstration awaits you at
your Heathkit Electronic Center t
The 25 prints the entire 95- character ASCII set in upper
case and lower case with descenders, in a 9x9 matrix. Also,
33 block graphic characters which are compatible with
the Heath /Zenith 89 All -In -One Computer and the 19 Smart
Video Terminal let you create graphs and charts. All functions and timing are microprocessor -controlled.
Plug -in ribbon cartridges make ribbon replacement a
no -mess snap.
The 25 works with most computers and terminals
using an RS -232C Serial Interface or a 20 mA
current loop with handshaking control signals.
-
-
HEATH /ZENITH
-
Your strong partner
*150 characters per second
Visit your Heathkit Electronic Centert
Where Heath /Zenith Products are displayed, sold and serviced.
SAN ANTONIO, TX
(Rt 30) 7111 Blanco Rd.
PHOENIX, AZ
SACRAMENTO, CA
2727 W Indian School Rd 1860 Fulton Ave
602 -279 -6247
916- 486 -1575
ATLANTA, GA
5285 Roswell Rd
404 -252 -4341
PAUL, MN
1645 White Bear Ave
612- 778 -1211
ROCHESTER. NY
937 Jefferson Rd
716 -424 -2560
FRAZER, PA
301- 861 -4446
215- 647 -5555
512- 341 -8876
ANAHEIM,
CHICAGO, IL
3462 -66 W. Devon Ave.
312 -583 -3920
ROCKVILLE, MD
5542 Nicholson Lane
301- 881 -5420
BRIDGETON, MO
3794 McKelvey Rd.
314- 291 -1850
N. WHITE PLAINS. NY
330 E. Ball Rd.
714- 776 -9420
WOODLAND HILLS, CA
22504 Ventura Blvd.
213 -883 -0531
PHILADELPHIA, PA
6318 Roosevelt Blvd
215- 288 -0180
MIDVALE, UT
58 East 7200 South
801 -566 -4626
CAMPBELL, CA
2350 S. Bascom Ave.
408- 377 -8920
DENVER. CO
5940 W. 38th Ave.
303 -422 -3408
DOWNERS GROVE. IL
224 Ogden Ave
312 -852 -1304
PEABODY, MA
242 Andover St (Rt. t 14)
617 -531 -9330
OMAHA, NE
9207 Maple St.
CLEVELAND, OH
28100 Chagrin Blvd
402- 391 -2071
216- 292 -7553
PITTSBURGH, PA
3482 Wm Penn Hwy.
412- 824 -3564
ALEXANDRIA, VA
6201 Richmond Hwy.
703 -765 -5515
EL CERRITO, CA
AVON, CT
395 W. Main St. (Rt 44)
203 -678 -0323
INDIANAPOLIS. IN
2112 E. 62nd St.
317- 257 -4321
WELLESLEY, MA
ASBURY PARK, NJ
165 Worcester Ave. (Rt. 9) 1013 State Hwy. 35
201-775 -1231
617 -237 -1510
COLUMBUS. OH
2500 Morse Rd
614- 475-7200
WARWICK, RI
558 Greenwich Ave
401 -738.5150
VIRGINIA BEACH, VA
1055 Independence Blvd.
804 -460 -6997
HIALEAH, FL
4705 W 16th Ave.
305- 823 -2280
MISSION, KS
5960 Lamar Ave.
913- 362 -4486
DETROIT, MI
18645 W Eight Mile Rd.
313 -535 -6480
FAIR LAWN, NJ
35 -07 Broadway (Rt 4)
201 -791 -6935
TOLEDO. OH
48 S Byrne Rd.
419 -537 -1887
DALLAS, TX
SEATTLE, WA
2715 Ross Ave
214- 826 -4053
5058th Ave
PLANTATION, FL
LOUISVILLE,
12401 Shelbyville Rd
502-245-7811
EAST DETROIT, MI
18149 E Eigh) Mile Rd.
313 -772 -0416
AMHERST. NY
WOODLAWN, OH
10133 Springfield Pike
513 -771 -8850
FORT WORTH, TX
6825 -A Green Oaks Rd
817- 737 -8822
TUKWILA, WA
15439 53rd Ave.
206 -246 -5358
HOPKINS, MN
101 Shady Oak Rd.
JERICHO. LI, NY
516- 334 -8181
HOUSTON, TX
1704 W Loop N
713- 869 -5263
VANCOUVER, WA
516 S E. Chaklov Da #1
612- 938 -6371
OKLAHOMA CITY. OK
2727 N W Expressway
405 -848 -7593
CA
6000 Potrero Ave.
415- 236 -8870
LA MESA, CA
8363 Center
Dr.
714 -461 -0110
LOS ANGELES, CA
2309 S. Flower St.
213- 749 -0261
7173 W Broward Blvd.
305 -791 -7300
KY
TAMPA, FL
KENNER, LA
POMONA, CA
1555 N. Orange Grove Ave 4019 W Hillsborough Ave. 1900 Veterans Mem. Hwy
504- 467 -6321
714- 623 -3543
813 -886 -2541
REDWOOD CITY, CA
2001 Middlefield Rd.
415- 365 -8155
BALTIMORE. MD
1713 E Joppa Rd.
ST.
3476 Sheridan
716- 835 -3090
15
Dr.
Jericho Turnpike
7 Reservoir Rd.
914-761-7690
630 Lancaster
Pk
tHeathkit is a registered trademark of Heath Company. Heath Company and Ventechnology Electronics Corporation
are wholly -owned subsidiaries of Zenith Radio Corporation. Heathkit Electronic Centers are operated by Verdechnology Electronics Corporation.
N
206 -682 -2172
S
206 254 4441
MILWAUKEE, WI
5215 W. Fond du Lac
414- 873 -8250
CP-208
APRIL 1982
9
new products
zoom microphone (included) fits onto the
top of the camera. Weight is 4.4 lb.
$995.
3 -D Graphics Tablet
CIRCLE NO. 91 ON FREE INFORMATION CARD
Telephone with Built -In
Cassette Recorder
The "Space Tablet" from Penguin Software (hardware manufactured by Micro
Control Systems, Inc.) is a three- dimensional graphics input device designed to
interface with the Apple II microcomputer. The tablet consists of a clear, 16" x 13"
two -dimensional workspace, approxi-
mately proportional to the Apple screen.
An arm is located at the top center of the
tablet, and is capable of rotating on all
three axes, as well as up and down. When
a user enters a line -either by tracing a
real object or by arbitrary pointing of the
arm, the three -dimensional coordinates of
its endpoints are stored by the computer,
which then connects the points with lines
drawn in any of the Apple colors. Thus, a
3 -D object can be displayed on a screen,
rotated on any axis, scaled, edited, and
stored in the computer memory. The
tablet also has two buttons for additional
input (connected to Apple via the paddle
port). Software for the tablet permits
standard 2 -D graphics, as well; and includes machine language subroutines that
can be added to other programs-allowing them to poll the tablet for coordinates.
$395.
CIRCLE NO. 94 ON FREE INFORMATION CARD
DCE or DTE signals. $60. Address: Warren Instrotech, Box 4500, Ogdensburg,
NY 13669.
The APF Electronics Save -A -Call Model
3226 telephone has a built -in microcassette deck that permits storing and playback of telephone conversations. In addition, the unit features a two -way speaker
for hand -free operation. It also has a button for last- number redialing, a fast rewind button, and a stop function. It
measures 2 "W x 71/2 "H plus a base width
of 23/4" and 41/2 "D. $180.
Water -Resistant
Car Door Speakers
CIRCLE NO. 92 ON FREE INFORMATION CARD
Data Line Tester
The W -DLT from Warren Instrotech is
said to be able to identify the seven most
commonly used RS232 data lines in virtually any computer, peripheral, or cable
and locate the source of faulty hook -up.
The tester functions as a null modem
between two outputs and eliminates the
need for diagnostic rewiring as long as the
computer or peripherals use the standard
Wrapped -Wiring Tool
Clearance problems and potential water
damage for door- mounted car stereo
speakers are claimed to have been eliminated by the dual -cone TS -1644 speakers
from Pioneer Electronics of America. The
two -way 61/2" speakers have a mounting
making it possible, acdepth of 15/s
cording to Pioneer, to clear most door
obstructions found in today's smaller automobiles. Constructed with a water- resistant low- distortion paper cone, the speakers are said to have a frequency range of
50 to 20,000 Hz, and a sensitivity of 91
dB. They feature 8.5 -oz high- energy
strontium magnets and are fitted with an
acoustically transparent mesh grill in a
heat -resistant plastic frame. The TS -1644
also has a horn tweeter with a 0.75 -oz
strontium magnet. Maximum input power
is rated at 25 W. $90.
"-
Vector Electronic's Model P184 -1 is
claimed to permit wrapped wiring without
measuring, cutting, or stripping. Tefzelinsulated 28 -gauge wire is routed through
the tool's center past a knife -edge where
the insulation is split lengthwise. As the
tool is rotated, bare wire makes contact
with the post. The P184 -1 features a tension- regulated spool to reduce wire break10
age, and set -screw mounted wrapping bits
designed for easy replacement. A standard 50' spool of wire is said to permit
about 200 daisy- chained, or 150 post -topost, seven -turn wraps with an average
lead length of 2 ". Cost with a 50' spool is
$39; an optional 300' spool bracket is
available at additional cost.
CIRCLE NO. 93 ON FREE INFORMATION CARD
CIRCLE NO. 95 ON FREE INFORMATION CARD
Plug -In Theft Protection
The Alertmate from Biometric Systems is
an electrical plug adapter to protect valuPOPULAR ELECTRONICS
eport Manager and the
PC -8000 Personal Computer:
An unprecedented three dimensions
f management information.
All those legendary electronic spread
sheets that have been making other
kinds of personal computers so useful
for managers are now literally flat
by comparison to the remarkable
combination of Report Manager" and
the NEC PC -8000 Personal Computer.
Here you get the power and versatility
of an electronic book not a mere
electronic page. An axis of depth joins
the horizontal and vertical -so you can,
for instance, track a number of different
profit centers over the same period of
time or follow actual performance
against prcjections by both department
and time frame.
.
The fact is :hat any sort of planning
work you fnd useful in two dimensions,
you will fird that much more useful in
three. The irogram allows you to see
four separate "slices" of your 3 -D "Data
Cube - "on one screen, for fast, real time
comparisons. There are, besides dozens
of math and editing functions, built -in
clock and calendar functions, too
an immensely useful convenience for
scheduling flow- charting, project
management, and the like.
-
Watch Report Manager run -easy as
B, C anc powerful as X, Y, Z -on the
PC -8000 at any NEC Home Electronics
A,
(USA) dealer.
Productivity
at your fingertips
NEC
NEC Home Electronics (USA)
Personal Computer Division
printout showing use of X, Y, and Z axes.
Report Manager and Data Cube are trademarks of The image Producers, Inc.
Sample
1401 Estes Avenue
Elk Grove Village, IL 60007
ens,
products
the proper code being dialed in, a loud
noise will occur. Codes are preset at the
factory, with 256 choices possible. $25.
CIRCLE NO. 96 ON FREE INFORMATION CARD
TV /VCR Video Switch
Winegard has introduced a new video
selector, the Model VS -4002. The selector
uses slide switches that permit the viewer
to watch, record, and edit programming
without connecting or disconnecting cables. Four 75 -ohm inputs accept any combination of the following: cable TV, over-
able equipment and appliances from unauthorized removal. The unit plugs into
an ac outlet and receives the plug from the
equipment you want to protect. Then the
alarm is set. If the cord is cut or unplugged; or if Alertmate is unplugged without
Universal breadboarding elements
with 840 solderless plug -in tie points.
Combines distribution system with
1 "x.1" matrix.
Compatible with all DIPs
and discretes with lead diameters up to
.032 ". Needs no special patch cords.
ERASABLE CIRCUIT BUILDING.
Build a circuit almost as fast
as you dream it up. Pull it
as many as nine 14 -pin DIPs.
Instant -mount backing
and quick-removal screws
make stacking and racking
a snap, too.
Where to buy? Phone (toll free) 800 -321 -9668 for the
name of your local A P distributor. In Ohio, call collect
apart and do anothereverything's as good as new.
Our versatile Super-Strip
mini -breadboards give you
the same top-quality contacts you get in our full scale ACE All- Circuit Evaluators. Not so "mini;' either.
You can build circuits with
A P
the -air pay TV, outdoor antenna, VCR
disc, video games, earth station, computer
terminals, etc. Viewers can watch any one
of four inputs on the TV receiver while
recording any one of three inputs on a
VCR, as well as monitor and edit videotape on a second receiver. The selector
reportedly has high-isolation circuitry to
prevent interference. $125.
CIRCLE NO. 97 ON FREE INFORMATION CARD
Polk Speaker
The Monitor Four is Polk Audio's lowest
priced speaker. Said to incorporate most
of the design concepts of the larger Polks
the speaker has a 1" soft -dome tweeter, a
trilaminate polymer driver, moving -coil
high - frequency radiator, and isophase
crossover network. It also includes a computer- designed anti- diffraction grille
frame. Some specs: sensitivity, 90 dB at
W /m; impedance, 8 ohms; frequency response (± 3 dB), 70- 20,000 Hz. Dimensions are 141/2"H x 81/2"W x 71/2" D;
designed for either bookshelf or pedestal
mounting. $100.
1
CIRCLE NO. 98 ON FREE INFORMATION CARD
Instrument Panel for
Bicycles
216- 354 -2101. And ask for our
complete A P catalog.
PRODUCTS INCORPORATED
9450 Pineneedle Drive
P.O. Box 603
Mentor, Ohio 44060
[216) 354 -2101
TWX: 810-425 -2250
In Europe,
contact A
Baeumlesweg 21
P PRODUCTS GmbH
D -7031 Weil 1
W. Germany
CIRCLE NO. 5 ON FREE INFORMATION CARD
12
A digital display of three functions: dis
tance, speed, and cadence is possible with
the OSCar meter introduced by Hilgraeve
POPULAR ELECTRONICS
What makes this radar detector
so desirable that people
used to willingly wait months for it?
Anyone who has used
a conventional passive radar
detector knows that they don't work over hills, around
corners, or from behind. The ESCORT' radar warning
receiver does. Its uncanny sensitivity enables it to pick
up radar traps 3 to 5 times farther than common detectors. It detects the thinly scattered residue of a radar
beam like the glow of headlights on a dark, foggy road.
You don't need to be in the direct beam. Conventional
detectors do. Plus, ESCORT's extraordinary range
doesn't come at the expense of more false alarms. In
fact, ESCORT has fewer types and sources of false
alarms than do the lower technology units. Here's how
of speaking with the most knowledgable experts available and saving us both money at the same time. Further,
your purchase as well as pay for your postage costs to
return it. In fact, try an ESCORT and any other detector
in the unlikely event that your ESCORT ever needs re-
of your choice. Test them both for 30 days and return
the one you don't like. We're not worried because we
know which one you'll keep. As further insurance for
your investment, ESCORT comes with a full one year
limited warranty on both parts and labor. This doesn't
worry us either because ESCORT has a reputation for
reliability. We know that once you try an ESCORT,
radar will never be the same again. So go ahead and
pair, our service professionals are at your personal
disposal. Everything you need is only a phone call or
parcel delivery away.
Carrying case
and
visor clip
included
we do it.
The unfair advantage
ESCORT's secret weapon is its superheterodyne
receiving circuitry. The technique was discovered by
Signal Corps Capt. Edwin H. Armstrong in the military's
quest for more sensitive receiving equipment. ESCORT's
Varactor -Tuned Gunn Oscillator singles out X and K
band (10.525 and 24.150Hz) radar frequencies for close,
careful, and timely examination. Only ESCORT uses this
costly, exacting component. But now the dilemma.
The right stuff
ESCORT looks and feels right. Its inconspicious size
(1.5H x 5.25W x 5D), cigar ig hterpower con nector and hook
I
and loop or visor clip mounting make installation easy,
flexible, and attractive. The aural alarm is volume ad-
justable and the alert lamp is photoelectrically dimmed
after dark to preserve your night vision. And, a unique
city /highway switch adjusts X band sensitivity for
fewer distractions from radar burglar alarms that share
the police frequency while leaving K band at full strength.
Another nice thing about owning an ESCORT is that
you deal directly with the factory. You get the advantage
How many ESCORTs you want.
Any special shipping instructions.
Your daytime telephone number.
A check or money order.
mow
V/SA
Corroborating evidence
...
CAR and DRIVER
"Ranked according to performance, the ESCORT is first choice
it looks like
precision equipment, has a convenient visor mount,
and has the most informative warning system of any
unit on the market
the ESCORT boasts the most
careful and clever planning, the most pleasing packaging, and the most solid construction of the lot :'
BMWCCA ROUNDEL
"The volume control has a
'silky' feel to it; in fact, the entire unit does. If you want
the best, this is it. There is nothing else like it :'
PLAYBOY
"ESCORT radar detectors
(are)
generally acknowledged to be the finest, most sensitive,
most uncompromising effort at high technology in the
field :'
PENTHOUSE ... " ESCORT's performance stood out
like an F -15 in a covey of Sabrajets :'
...
...
to the mail box.
CALL TOLL FREE.... 800 -543 -1608
IN OHIO CALL
800 -582 -2696
ESCORT
...
AUTOWEEK... "The ESCORT detector by Cincinnati
Microwave
is still the most sensitive, versatile
detector of the lot!'
...
There's only one way to really find out what ESCORT
is all about. We'll give you 30 days to test it for
yourself. If you're not absolutely satisfied, we'll refund
(Includes everything).
.
$ 245.00
Ohio residents add $13.48 sales tax
...
...
(6wr.eae
Visa and MasterCard buyers may substitute
their credit card number and expiration date for
the check. Or call us toll free and save the trip
The acid test
Made in Cincinnati
You don't have to wait
Just send the following to the address below:
O Your name and complete street address.
O
O
O
The Lady or The Tiger
At the instant of contact, how can you tell a faint
glimmer from an intense radar beam? Is it a far away
glint or a trigger type radar dead ahead? With ESCORT
it's easy: smooth, accurate signal strength information.
A soothing, variable speed beep reacts to radar like a
Geiger counter, while an illuminated meter registers fine
gradations. You'll know whether the radar is miles away
or right next to you. In áddition, the sound you'll hear is
different for each radar band. K band doesn't travel as
far, so its sound is more urgent. ESCORT keeps you
totally informed.
do it. Order today.
Extra speedy delivery
order with a bank check, money order,
Visa, or MasterCard, yotir order is processed for
shipping immediately. Personal or company
checks require an additional 18 days.
If you
ESCORT.
RADAR WARNING RECEIVER
O CINCINNATI MICROWAVE
Department 531
255 Northland Boulevard
Cincinnati, Ohio 45246
nets' producth
Here's
why we're
Number
One.
When it comes to logic
probes, more people buy
Global Specialties. Because
no one can match us for value.
Our four logically-priced
probes including our
remarkable new 150 MHz
ECL- deliver more speed,
accuracy, flexibility and
reliability than others costing
considerably more! So why
compromise? Discover
for yourself why were
the number -one
logical choice!
-
Standard LP-1, $50.001 with memory
-captures pulses to
50 nsec,
Inc. Designed for the serious cyclist, OS-
Car (Odometer/Speedometer /Cadence)
uses metal detectors to sense motion of the
bicycle's spokes. The sensor is encapsulated in silicone rubber and is claimed to
be immersible and impact- resistant. A 9V transistor battery powers the unit,
which offers continuous storage of the
odometer reading. Accuracy depends on
tire size and design and inflation pressure,
but is said to be within ± 1.5% for the
speedometer and 1.3% for the cadence
meter. $129.95. Address: Hilgraeve, Inc.,
Box 941, Monroe, MI 48161.
Microcomputer
Enclosure
To convert the AIM 65 micro system
from a "bare bones" unit to one with a
finished look, an accessory enclosure, with
or without an integral power supply, has
been introduced by Rockwell International. The enclosure includes an on /off
switch, a pushbutton reset switch mated
to the AIM 65 reset switch, and pre-wiring with internal ac lines. Removable
plugs in the cover allow access to the
AIM 65 run /single-step and KB /TTY
switches. The paper supply for the thermal printer is kept in an external holder to
facilitate ease of replacement. The enclosure with power supply (Model A65 -006)
provides +5 V dc at 3 A and +24 V dc at
0.5 A. Model A65 -002 (without power
supply) costs $95. With power supply,
cost is $165.
CIRCLE NO. 99 ON FREE INFORMATION CARD
10 MHz, guaranteed.
Economy LP-2, $32.00', to 50 nsec,
1.5 MHz.
High -speed LP-3, $77.00' with
memory, guaranteed to
10
Power Amplifier
nsec
wraparound main -frame and mounted
handles. Specs: THD from 20- 20,000 Hz,
0.05 %; S /N, 105 dB (damping factor,
200); slew rate, 40 V /µs. $649.
CIRCLE NO. 100 ON FREE INFORMATION CARD
Duty -Cycling
Thermostat
The Savlt, from Electronic Systems International, is an internally fused, preprogrammed thermostat that is designed to
operate in series with an existing thermostat. It works through two closed relay
contacts, said to be capable of switching
up to two amperes at 50 V ac. The unit
makes use of the principle of duty
cycling-shutting off a central heater or
air conditioner for a predetermined short
interval to save electricity that would be
needed to keep the equipment running
constantly. There is a choice of six time
functions -three each in the heating and
cooling modes -that correspond to the
low, medium, and high settings on a heater or central air conditioner. An internal
circuit uses the 60 -Hz waveform for timing control; and the current requirement
is rated at 0.2 A. $298. Address: Electronic Systems International, Inc., 5600 Roswell Rd., Ste 200, Prado East Atlanta,
GA 30342.
Receiver /Monitor
Conversion Kit
The ACVM -2 from V.A.M.P. Inc. is a
direct video conversion kit that can be
installed in a B &W or color receiver for
the purpose of eliminating ghosting, color
shifting, r -f radiation, and signal interference. It works by bypassing the tuner and
r -f sections of a conventional receiver, providing high -resolution displays of up to 80
characters in the monitor mode. Modes
are shifted via a two -position switch. The
ACVM -2 will work with any receiver currently on the market, except those whose
chassis common is not directly connected
to ac neutral. $35. Address: V.A.M.P.
Inc., 6753 Selma Ave., Los Angeles, CA
90028.
(6 nsec, typical), 50 MHz!
New ECL LP-4, $150.00 the new
industry standard -with memory,
guaranteed to 4 nsec (2 nsec, typical),
*,,
Surge Suppressor
150 MHz!
GLOBAL
SPECIALTIES
CORPORATION
70
Fulton Terr New Haven. CT 06509 ß03I624 -3103 TWX 710- 465 -1227
OTHER OFFICES San Francisco (4151648 -0611. TWX 910- 372 -7992
Europe. Phone Saffron -Walden 0799 -21682 TLX 817477
Canada Len Finkler Ltd Downsview. Ontano
Call toll -free for details
1-800 -243 -6077
During business hours
Suggested
U
specifications sublerr 10 change without notice
O Copyright 1981 Global Specialties Corporation
S resale Prices
CIRCLE NO. 21 ON FREE INFORMATION CARD
Power MOSFETs are featured in the new
LA2502 amplifier from Soundcraftsmen.
The unit is said to be capable of delivering
380 W total at 4 ohms impedance, or 125
W /ch at 8 ohms in the stereo mode. Dual
strings of 20 LEDs each provide calibrated metering at 1 -3 -dB intervals up to
500 W output. True Clipping LEDs are
said to indicate the actual onset of waveform distortion. Also provided: speaker
switching with A plus B capability, zero to- maximum gain controls, and modular
chassis construction with a 16 -gauge steel
Manufactured by Advanced Electronics
and marketed by National Field Sales, the
Stedi -Watt, Jr. is a six -outlet surge suppressor that plugs into any standard threewire, duplex receptacle to protect equipment against damaging voltage spikes.
The unit responds to filter out transients
of up to 6000 V within less than a ten thousandth of a second. Continuous operation is indicated by an amber light.
Available in ivory or dark brown. $59.50.
Address: National Field Sales Inc., 2660
West Chester Pike, Broomall, PA
19008.
POPULAR ELECTRONICS
TOOL & SOLDER STATION
Model 3K-25
;SOLDER
CIRCLE NO. 36 ON FREE INFORMATION CARD
A
If you have put off
learning more
electronics for any
of these reasons,
act now!
I
don't have the time.
High school was hard for me and
electronics sounds like it may be
hard to learn.
I can't
afford any more education.
I have a family now.
I-1
I'm here. You're there. I've never
learned that way before. I'm not
sure it will work for me.
Read the opposite page and see how you can get started today!
16
POPULAR ELECTRONICS
Be honest with yourself. Are
the reasons really excuses? You
already know enough about
electronics to be interested in
reading this magazine. So why
not learn more? If you need
encouragement, read on and
see how excuses can be turned
into results.
You don't have the time. Be realistic.
All you have in life is a period of time.
Use it. Try to know more tomorrow
than you do today. That's the proven
way to success. CIE studies require just
about 12 hours of your time a week, two
hours a day. You probably do have the
time.
Electronics sounds like it may be hard
to learn. You already know something
about electronics or you wouldn't be
reading this. Now, build on that. CIE
Auto -Programmed ® Lessons help you
learn. Topics are presented in simple,
logical sequence. All text is clear and
concise for quick, easy understanding.
You learn step by step, at your own
pace. No classes to attend. Nobody
pressures you. You can learn.
You can't afford any more education.
Actually, you can't afford NOT to
gain the skills that can put you ahead of
the others. You know what inflation is
doing to you now. Education -learning
a skill-is an inflation -fighter that can
be yours. If you are not able to pay full
tuition now, CIE will lend you funds on
a monthly payment plan.
You have a family now. All the more
reason why you have the responsibility
to advance yourself. For the sake of
your family. Do you want them to have
what you had or have more than you
had? The choice is yours. Electronics is
a rewarding career choice. CIE can help
you to get started on that career.
You're there. We're here. How does
CIE help you learn? First, we want you
to succeed. You may study at home, but
you are not alone. When you have a
question about a lesson, a postage
stamp gets you your answer fast. You
may find this even better than having a
classroom teacher. CIE understands
people need to learn at their own pace.
When CIE receives your completed
lesson before noon any day of the week,
it will be graded and mailed back the
same day with appropriate instructional
help. Your satisfaction with your
progress comes by return mail. That's
how CIE helps you learn.
NOW, IF YOU AGREE CIE
TRAINING CAN WORK
FOR YOU, HOW ELSE
CAN CIE HELP YOU?
Cleveland Institute of Electronics is the
largest independent home study school
in the world that specializes exclusively
in electronics. Although "big" does not
always mean "best;' it is evidence that
CIE is a strong, successful institution
with the people and resources to help
you succeed.
APRIL 1982
Find out more!
Today. Now.
There's a card with this ad. Fill it in
and return. If some other ambitious
person has already removed it, use the
coupon.
You'll get a copy of CIE's free
school catalog, along with a complete
package of personal home study
information.
For your convenience, we'll try to
arrange for a CIE representative to
contact you to answer any questions
Step -by -step learning includes
"hands -on " training.
The kind of professional you want to be
needs more than theory. That's why
some of our courses include the
Personal Training Laboratory, which
helps you put lesson theory into actual
practice. Other courses train you to use
tools of the trade such as a 5MHz
triggered- sweep, solid -state oscilloscope
you build yourself -and use to practice
troubleshooting. Or a Digital Learning
Laboratory to let you apply the digital
theory that's essential today for anyone
who wants to keep pace with electronics
in the eighties.
you may have.
If you are serious about a rewarding
career, about learning electronics or
building on your present skills, your
best bet is to go with the electronics
specialists-CIE. Mail the card or
coupon today or write CIE (please
mention the name and date of this
magazine), 1776 East 17th Street,
Cleveland, Ohio 44114.
This could be the best decision
you've made all year.
Associate Degree
Now, CIE offers an Associate in
Applied Science Degree in Electronics
Engineering Technology. In fact, all
or most of every CIE Career Course
is directly creditable towards the
Associate Degree.
"If you're going to learn
electronics, you might as well
learn it right:'
John Cunningham
Senior Technical Director
Your FCC License can impress
employers.
For some electronics jobs, you must
have your FCC License. For others,
employers usually consider it a mark in
your favor. Either way, your License is
government- certified proof of your
knowledge and skills. More than half
of CIE's courses prepare you to pass
this exam. Surveys show that some
80% of CIE graduates who take the
exam are successful.
CIE
IM
Cleveland Institute
of Electronics, Inc.
PE-60
1
1776 East 17th Street, Cleveland, Ohio 44114
1
YES. -1 want to learn from the specialists in electronics -CIE. Send me my FREE
CIE school catalog...including details about the Associate Degree program...plus my
FREE package of home study information.
Print Name
i
Address
Apt
'City
State
Age
Zip
Phone (area code)
Check box for G.I. Bill bulletin on Educational Benefits:
Veteran
Active Duty
MAIL TODAY!
1!
CN1E1INMCNT
ELECTRONICS
By Len Feldman
Audio Goes Digital in Las Vegas
HAT the recently concluded
Winter Consumer Electronics
Show (Las Vegas, NV) lacked in quantity of new product introduction, it made
up for in quality. In the world of audio
there was further evidence of a digital
revolution. Here the big news was about
tape recording, rather than discs, with
significant product and price breakthroughs from both Sony and Technics.
These two companies have taken different approaches to pulse code modulation
(PCM) recording. Sony has introduced
a third -generation PCM audio processor, while Technics showed an all -in-one
PCM audio tape deck. (While much has
already been written about compact digital discs, now promised for early 1983
by just about every major audio equip -.
ment manufacturer, some doubts about
the date of delivery exist; largely because of difficulties in the production of
software.)
Iv-
Digital Audio from VCRs. By way of
background, in the mid -1970s Sony produced the first digital audio processor
for consumer use, the Model PCM -1.
This rather bulky unit was designed to
be used with the (then) newly introduced video cassette recorders such as
Betamax, U -Matic and, later, the competing VHS format. The Sony processor
converted an audio signal to digital
pulse -code (14 -bit "words" were used)
so that, during playback, frequency response was ruler -flat to 20 kHz, distortion negligible, and wow or flutter was,
for all practical purposes, nonexistent.
This meant that millions of digital bits
were stored on the tape every second.
This information -density requirement
was best met by video tape formats
designed to handle video- signal (MHz)
bandwidths.
So complex was the first PCM audio
processor, that its suggested retail price
was around $5000. Then there was the
cost of a VCR (another $1000); hardly
the sort of setup that audio recording
enthusiasts were going to buy in droves.
Other companies began experimenting
with PCM recording tied into VCRs and
it soon became clear that standards
would be required if any inter-system
compatibility was to prevail. After
lengthy meetings, the Electronics Industry Association of Japan (EIAJ) formulated such standards and Sony introduced their second PCM processor, the
Model PCM -10 in 1980. While the new
20
-
processor adhered to the new EIAJ standards, it still cost around $5000. All of
which makes Sony's introduction of the
PCM -Fl PCM processor more significant; its suggested retail price is around
$1900.
New large -scale integrated circuits
(LSIs), some of them designed by Sony,
enable the PCM -F1 to be one-eighth the
volume and one -fifth the weight of earlier processors. In fact, the PCM -F1
weighs less than nine pounds, can be
powered from ordinary ac, an optional
rechargeable battery, or a car /boat battery adapter, and measures only 81/2 in.
by 3'/s in. by 12 in. While it will work
with any available VCR format, Sony is
promoting its use with its portable SL2000 "BetaPak." The PCM- F1 /SL2000 combination is a state -of- the -art
audio recording system that weighs only
18 pounds!
Sony executives feel strongly that the
PCM -F1 (combined with a VCR) offers
an attractive alternative to the best
open -reel audio deck-even decks that
handle the new "EE" tape formulations.
And the $1900 price may well attract
audiophile, semiprofessional, and even
professional recordists. Newly developed LSIs were essential to obtaining
size and weight reduction for the new
processor according to the PCM -F1
block diagram.
The Technics approach to PCM digital recording involves a new all -in-one
digital tape deck (reminiscent of the
analog Elcaset deck in configuration).
The new deck (Model SV- P100), uses
VHS video cassettes and conforms to
the EIAJ standards for VCR -related
(4.0
digital audio recording. And the SVP100's built -in tape transport is fundamentally the same as the transport systems used in VHS video recorders. But
by building a one -piece, dedicated audio
product (instead of adapting a video
recorder), Technics can offer several
convenience features that are particularly, suited to sound recording. For
example, the SV -P100 can be programmed to "skip over" specified selections during playback. Moreover, its
four -digit tape counter allows precise
cueing, rudimentary editing, etc. Unlike
the Sony PCM -F1, however, the SVP100 is strictly a homebound machine
operable only from 120 volts ac and
weighing about 50 pounds.
A roundup of new digital audio technology at the Winter CES would not be
complete without mentioning the first
prototype of an upcoming product that
the people at Acoustic Research were
demonstrating. Called an Adaptive Digital Signal Processor, the device performs a computer analysis of sound
reproduction at any location in a room
and then, after making about four million calculations in a minute and a half,
"designs" the reciprocal filter needed
for a "flat" speaker- and -room response-even if that filter involves fifty
or more wide and narrow peaks and dips
in its own response curve! The ADSP is
likely to be a consumer product within a
few months.
Video Forefront. This year at CES
there was relatively little new to report
concerning video disc players and video
cassette recorders, with the exception of
a surprise introduction by Technicolor.
They have cleverly combined a color
video camera with a new, more compact
version of its I/4 -inch micro -video tape
recording mechanism to create an "almost-in-camera" VCR system -well
ahead of many larger video-product
companies.
Meanwhile, Henry Kloss of Kloss
Video Corporation, who can always be
relied upon to come up with products
that his competitors have dismissed as
technically "impossible," demonstrated
his legendary finesse again this year.
Kloss's new Novabeam® Model Two is a
compact, portable television projector
that produces a bright 3' by 4' color-TV
SONY
.IVICESS,,, RAI E.
DraTA.L
Sony's PCM-Fl Digital Audio Processor
POPULAR ELECTRONICS
ANNOUNCING TWO
NEW TERMINALS
Smart
Fast
Matching Modem and $295 Printer
Graphics
Netron,cs announces a state of the art
breakthrough in terminals. now at prices you
can afford, you can go on -line with data-bank
and computer phone-line services. Its all
yours. "electronic newspapers." educational
services, Dow -Jones stock reports, games,
recipes. personal computing with any level
language, program exchanges, electronic bulletm boards ... and more every day!!!
Netronics offers two new terminals. both
feature a full 56 key /128 character typewriter
style keyboard. baud rates to 19.2 kilobaud, a
rugged steel cabinet and power supply. The
simplest one, FASTERM -64, is a 16 line by 64 :.,r 32 'aracter per line unit, w
. -a
printer port for making hard copy of all incoming data, and optional provisions tor block a'.ú
special character graphics. The "smart" version. SMARTERM -80, features either 24 line by Bu
characters per line or 16 by 40 characters per line, it otters on- screen editing with page -at-atime printing, 12,000 pixel graphics, line graphics, absolute cursor addressing, underlining.
reverse video, one -half intensity and much more ... simply plug them into your computer or
our phone modem and be on -line instantly. Use your TV set (RF modulator required) or our
deuux green- phosphor monitor pictured above. For hard copy just add our matched printer.
Price breakthrough!!! Own the FASTERM -64, a complete terminal kit, ready to plug in for
just $199.95 or order the SMARTERM -80 kit for just $299.95, (both available wired and tested.)
Be on -line with the million -dollar computers and data services today ... we even supply the
necessary subscription forms.
More good news: All the components in our terminals are available separately (see
coupon), so you buy only what you need!!!
FASTERM-64 ... DISPLAY FORMAT: 64 or 32 characters/line by t6 lines
96 displayable
ASCII characters (upper 8 lower case) ... 8 baud rates: 150, 300, 600, 1200, 2400 4800, 9600.
19, 200, (switch sel.) .. LINE OUTPUT: RS232/C or 20 ma current loop
VIDEO OUTPUT: 1V
P/P (EIA RS-1701... CURSOR MODES: home & clear screen, erase to end of line, erase cursor
line, cursor up & down. auto carriage return /line feed at end of line & auto scrolling
REVERSE VIDEO... BLINKING CURSOR ... PARITY, oft, even or odd .. STOP BITS: 1, 1.5,
2 ... DATA BITS PER CHARACTER: 5, 6, 7 or 8
CHARACTER OUTPUT: 5 by 7 dot matrix
1K ON BOARD RAM
..
in a 7 by 12 cell
PRINTER OUTPUT: prints ali incoming data
2K ON BOARD ROM .. CRYSTAL CONTROLLED .. COMPLETE WITH POWER SUPPLY ..
OPTIONAL GRAPHICS MODE: includes 34 Greek & math characters plus 30 specie, graphics
characters ... ASCII ENCODED KEYBOARD: 56 key /128 characters.
SMARTERM8O .. DISPLAY FORMAT. 80 characters by 24 lines or 40 characters by 16 lines
128 displayable ASCII characters (upper 8 lower case) 8 baud rates: 110, 300, 600, 1200, 2400.
4800, 9600, 19, 200 ... LINE OUTPUT: RS232IC or 20 ma current loop .. VIDEO OUTPUT. 1V
pp (EPA RS-1701... EDITING FEATURES: insert/delete line. insert /delete character, forward /back tab ... LINE OR PAGE TRANSMIT
PAGE PRINT FUNCTION
CURSOR POSITIONING: up, down, right, left, plus absolute cursor positioning with read back
VISUAL
ATTRIBUTES: underline. blink, reverse video, half intensity, & blank
GRAPHICS: 12.000
PARITY'. off.
pixel resolution block plus line graphics
ON- SCREEN PARITY INDICATOR
110
2.
all
others
1
...
7
11
even or odd.
STOP BITS:
baud
CHAR. OUTPUT: by
character in
BLINKING
60 OR 50 Hz VERTICAL REFRESH
a 9 by 12 block ... PRINTER OUTPUT
BLOCK CURSOR ... CRYSTAL CONTROLLED ... 2K ON BOARD RAM .. ASCII ENCODED
KEYBOARD: 56 key /128 character ... 4K ON BOARD ROM ... COMPLETE WITH POWER
SUPPLY.
FULL DUPLEX, FCC APPROVED
DATA RATE. 300 baud
TELEPHONE MODEM 103 O/A
INTERFACE RS232IC and TTY
CONTROLS: talk/data switch (no need to connect and
NO POWER SUPPLY REdisconnect phone). originate /answer switch on rear panel
QUIRED.
56 KEY/128 CHARACTER ASCII
ASCII KEYBOARD ASCII.3
FULLY DEBOUNCED
ENCODED
UPPER & LOWER CASE
POS OR NEG LOGIC WITH POS STROBE ..
2 KEY ROLLOVER ..
REQUIRES a- & -12V DC (SUPPLIED FROM VIDEO BOARDS(
PRINTER COMET ... SERIAL I/O TO 9600 BAUD .. 80
CHARACTER COLUMN (132 COMPRESSED) .. 10" TRACTOR FEED
INDUSTRY STANDARD RIBBONS
UPPER/LOWER CASE
4 CHARACTER SIZES
BIDIRECTIONAL
9 BY 7 DOT MATRIX
PRINTING
.
.
.
.
.
.
.
FOR ONLY $129.95 Learn Computing
From The Ground Up
Build a Computer kit that grows
with you, and can expand to 64k
RAM, Microsoft BASIC, lèxt Editor /Assembler, Nord Processor,
Floppy Disks and more.
EXPLORER /85
Here's the low cost way to learn the fundamentals of ove'
need
puling. the all-important
in
you'll
niece a,9d
bast
lust
mom as
you get he advanced'design Explorer/85 motherboard
with all the features you need to learn how to write and
it
can
grow
into
a
system
that is a
use programs. And
match for any personal computer un the market Look at
these features 8085 Control Prnre.s.srna I!n,l, the
microprocessor "heart'' of the Explorer /85 (loin the
millions who will buy and
the 8080/(1085 this rar
:done.)
Four Bhdpt.orneSbtt Input /output ports from
which you can input and output your programs. as well as
a cassette
ontrol extenor swat lies. nays lights. etc.
interface that leis sou Siam and reload erorams you've
(,'loge 2.O01 byte npernling
learned to write
system /monitor makes !I easy to learn computing in
It allows simpler. faster writ.
several important ways
permits access by you
ing and entering of programs
to all parts of the system sown] ran check on the status of
any point in the program
it allows (racing each pro.
gram step by step. with pmvisron for displaying all the
intents of the CPU (register, nag.. etc
and iI
thing much more!
You get all this in the starling level (level A) of the
,
-
special offers elow
O Level A computer kit (terminal Version)
8129.96
plus S3 P&I.'
7 level A kit (Hex Keypad /Display Version)
3128.95
plus $3 P81
LEVEL
This -building black- converts the motherboard into a Iwo-slot St00 bus (industry standard) computer. Now you can plug in any of the hundreds of S100
cards available.
17 level B kit
$49.95 plus S2 P81
D S100 bus connectors (Iwo required)
$4.85 each.
postpaid
B-
.
I
.
Continental U.S.A. Credit Card Buyers Outside Connecticut
CALL TOLL FREE 800.243.7428
NETRONICS
333
R &D
LTD.
bus connectors (five
required)
postpaid
LEVEL
When you reach the pant in learning that requires more memory. we l l
choices either add 4k
of a memory directly on the motherboard. or add 16k to
64k of memory by means of .r single Stoll card. our famous
D-
i
,
.
o
PAWS.
level D kv: (CHECK ONEI
plus 32 Pal D 16k S1í10
D 4k on- boar('
$19.%
"IAWti'.
5149.95 plus $2
32k S100 "TAWS"
$1 99.95 plus $2 PSI' :O 48k
S100 'TAWS'.
$249.85 plus $2 PAP'.' 54k 5100
'PAWS'
3299.95 plus S2 Pur
P&1
-
LEVEL E
An important "building black. a activates
thesk ROM/EPROM space on the mntherfoanl Now pig
plug in
r Bk Microsoft BASIC or your own custom
programs a
D level E kit
90.00 plus 50c Pal
Microsoft BASIC
Ifs the language that allows you to
talk English to your computer! It is mailable three ways
ek cassette version of Microsoft BAST: (requires level
B and 12k of RAM minimum/
m m/
e cuge
mtge., a /Ilk S100
-
$64.95
)
png,.n,I
ck
Litchfield Road, New Milford, CT 06776
-
TEXT EDITOR/ASSEMBLER
The editor /assembler
.,ftw :,m linil (a programl designed to simplify the task
of awriting programs. As your
ograms heroine longer
COMPLETE FASTERM -64 TERMINAL (includes FASTVID -64 video board
ASCII -3 keyboard, steel cabinet and power supply) ... kit $199.95 plus $3 P &I
wired & tested $249.95 plus $3 P &I ... graphics option: add $19.95 to
each of above
C COMPLETE SMARTERM -80 TERMINAL (includes SMARTVID -80 video
board, ASCII -3 keyboard, steel cabinet and power supply) ... kit $299.95 plus
$3 P &I ... wired and tested $369.95 plus $3 P&I
E FASTVID64 VIDEO BOARD (requires + 5 & -12V DC) ... kit $99.95 plus $3
P &I ... graphics option add $19.95 ... wired & tested $129.95 plus $3 P &I ..
graphics option add $19.95
E SMARTVID-80 VIDEO BOARD (requires +5 & +/ -12V DC) ... kit $199.95
plus $3 P &I ... wired & tested $249.95 plus $3 P&I
L DELUXE STEEL TERMINAL CABINET ... $19.95 plus $3 P &1
ASCII -3 KEYBOARD (requires +5 & -12VDC) ... kit $69.95 plus $3 P&I
wired and tested $89.95 plus $3 P &I
POWER SUPPLY (powers ASCII -3 keyboard & video boards) ... kit only
$19.95 plus $2 PSI
E ZENITH VIDEO MONITOR (high resolution green phosphor) ... wired &
tested $149.95 plus $6 P &I
L' TELEPHONE MODEM MODEL 103 O/A ... wired & tested $189.95 plus $3
and more wimples. the assembler can save you many
hours of programming lime This software includes an
editor program that renters the programs you write. makes
changos and saws the programs on cassrue., The assem'
tiler performs the clerical ,ask of translating symMdir.
,:ale inio the ampule, readable ol.inci rode. The editor/
ROMmhler program is available milker in cassette or a
P &I
$1.50 Pal'
.
.
.
.
DOT MATRIX PRINTER Comet I ... wired 8 tested $299.95 plus $10 P &I
RF MODULATOR MOD RF -1 ... kit only $8.95 plus $1 P&I
3FT -25 LEAD MODEM /TERMINAL OR PRINTER/TERMINAL CONNECTOR
CABLE ... $14.95 ea plus $2 P &I
:
For Canadian orders, double the postage Conn. res. add sales tax.
.
Total Enclosed $
Cashier's Check/Money Order
Personal Check
MasterCard (Bank No.
VISA
Exp. Date
Acct. No.
Signature
Print Name
Address
City
version
Editor /Assembler (Cassette rsn,n requires Level
B" and 8k (min of RAM
we
ggest 16k "TAWS"
see above)
S59.95 plus $2 PSI.'
Editor/Assembler (ROM i,rstoo supplied on an S100
requires level B and 4k RAM (min
we suggest
either level D or tus "TAWS'
$99.95 plus 52 P8I
8" FLOPPY DISK
A remarkable budding Klock"
Add our e' floppy disk when you nwst trim, operation
ant program storage. perhaps a business up.
more
pbcation. and access 'tithe horsily 1honsands of programs
program languages available helm You simply plug
and m, your
p s.r185 disk sysum
it a,,'pin all
IBM-formatted CP/
ograms
D 6" Floppy Disk Drive
$100.95 plus $12 P81
D Floppy Controller Card
11 99.95 plus 52 Put
D Disk Drive Cabinet a Power Supple
908 95 plus
-
I
-
Pat'
S, Drive Cables Ian( up fur two drives)
D
Hex Keypad / Dis
IT
FASTERM
64
pl'
TERM',
u
I
r,nntc,'r norminot
it you have an RF modulator)
169.95 plus $2 PSI'
AL NIT
Detu.,
plus
S:1
l'sl
-
J RE Modulator kit lull
s,
7minaret
S8.% p,slpaid
12
Vidin Monitor HMI! / han, l ii all hl
Il' sel
as
a
5139.95
pies AS PSI
D IMk...Steel Cabinet for the
Explorer /HS
549.95 plus 53
PSI
1
Fan for cabinet
phis SI 50 t'SI
515.08
ORDER A SPECIAL -PRICE
EXPLORER/85 PAK -THERE'S
ONE FOR EVERY NEED.
Hex Keypad /Display Version) with Hex Keypad/
Display. Intel lve.S User Manual. level A Hex Monitor
Senate Listing. and AP.I,S-amp power .supply
(Reg
5279 951 SPECIAL 5219.95 plus s5 PSI
Special Microsoft BASIC Pak (Save 5103.00I- Toupin
Levels A (Terminal Verstonl. B D 14k RAM) E. ilk
Microsoft in ROM. Intel 6085 tiger Manual, Level A Moiling Source Listing. and AP-I, 5 -amp power supply
I(Leg $43970) SPECIAL 5329.95 plus 57 PSI'
O Add a Rom -Version Text Editor /Assembler (Requires
levels B and D or Sim Memory)
599.95 plus 52 P81
.
Sraner 8" Disk System - Includes Level
A. R Poppy disk
controller. one CDc: H-- disk -drive. Iwo-drive cable. two
5100 connecting. lust add v
n power supplies.
rahinetsaand hardware
(tRegw51(051811 SPECIAL
D :0k Starter System. 51045.95
$999.95 plus 513 PSI
plus 513 PSI ' D 48k Stoner System. 01095.95 plus $l:i
P81. D 64k Viarier Synlrm. $1145.95 plus 51.1 PSI
Add to any of adwe Explorer .steel ,ahinel. AP.I five
rep power supply. level (: with two Sttxl connectors.
disk drive Pahmer and power supply. Iwo sub -U connectors for connecting your printer
terminal
Ile g
025 951 SPECIAI. 51 99.95 plus $13 Pal'
Complete 64K Sesrem Wire) A 'Healed
51650.00
plus 526 PA!
Special' Complete Business Software Pak (Save
Includes (:P /M 2.2 Mic.n,snfl BASIC. Cannel
5625
ledger. Accounts Receivable. Accounl.s Payahle. Payroll
Package
(Reg 51325) SPECIAL 5699.95 'postpaid
nil
al)-
'l'FI
derc.
stands for "pastime I' insomnie
a,l,l,, this mmiunl.
ForC,mndi,tn,v-
Continental Credit Card Buyers Outside Connecticut:
TO ORDER
Call Toll Free:
800 -243 -7428
To Order From Connecticut,
or For Technical Assistance,
Call (203) 354 -9375
CP /M is
*
a
rep trademark of
Digital Research
(Clip and mod entire
ndl*
SEND ME THE ITEMS CHECKED ABOVE
Tula/ Enclimed (Conn Residents add sales taxi
l'os by
'l
Personal Check
S
'J Cashier's Check/Money Order
125.80 plies
Disk Operas ing System. includes Text
Editgive emhler. dynamic debugger and oilier fealurn
features
That give y
your Explorer/65 access to stpaidds of mexisting
(:PlM -based programs
Step OD postpaid
D VISA
C MAS'IF.R CARD (Bank No
Z 2
NEED A POWER SUPPLY? Consider our AP'1 II can
supply all the power you need fur a fully expanded Ex.
plorer /851 note disk doves hair- (heirown power supply)
Plus the AP-1 his neatly ini the attractive Explorer steel
,..hint (see below)
'T AP -1 Power Supply kn OW 'O 5 amps) in deluxe steel
,shine!
.139.% plus 52 Put'
NEED A TERMINAL? We
offer ymi choies the least ex-
Exp Date
Acct No
Sign ,hire
--
pensive one
r
Prins Nome
Address
Hex
Keypad /Display kit that displays the information on
ulatorlype
n The
other choice
rr ASCII
Keyboard /Computer Terminal
lui that can he used with either
!
Zip
-
I-
rd.
cal
State
v
s
-
1
CPIM
Tl' v"
CRT monitor or :r
a
(
$4.95 each
version of Mu.mson BASIC (requires level B
& level E and 4k RAM. lust plug into your Level E sockets.
We suggest either the 9k level D RAM expansion or a thk
5100 "PAWS '')
SW.95 plus so PSI.
Disk version of Microsoft BASIC Inquires U'vel B.
32k of RAM. floppy disk controller. R' floppy
drivel
$325 postpaid
Please send the items checked below'
'
Ad,l41. HAM
.I
r
Ad,lr.io5ltolNa,rris
os/of,"
A,I,t
sipr, Ai ping inn
-
P81
-PAWS"- see As*.
Dept. PE
tiltxl
,
Beginner Pak (Save 526001- Yoo gel level A (Terminal Venlun) with Monitor Source Listing ($25 value/
AP -1..5 -amp power supply. Intel 8085 Users Manual
(Reg 519995) SPECIAL 5169.95 plus $4 PSI
You get Level A
:.' Eaperimearer Pak (Save 5.5340)
the motherboard and expands
the Sim bus to six slots.
D Level kit
S311.98 plus S2
:7 8k ROM
To Order From Connecticut Or For Tech. Assist. Call (203) 354 -9375
Microsoft H.\Sli.
l:iilun/AYSmhlerIII MAI
s
in cul,vcrl n,
Ad,l
'
-
.
.
Vetron
Nog in
I
5
'
LEVEL C
Add still m
nmputing power: this "build
ing block" mounts directly on
`7 S100
t
k,sinallDlspkit
11
Explorer/85 for only 8129.95. Incredible! To one lust
your 8VDC power supply and terminal or
plug
if you don't have them. see our
keyboard/display
a
0443
44.1
111
sloe
/ip
NETRONICS Research &DevelopmentLtd.
333 Litchfield Road, New Milford, CT 06776
audio
Audio Input Signal
(ICH)
o-+
(RCH)o
-
Low
Pass
Filter
Quartz
OSC
AID
a1iTi7,r17
Cx -7940
Ree Data
cx -99
cony
Video Output Signal
tor
SL-2000
BetaPak
1
.,..
Low
Pass
Filter
16K b1I RAM
Audio O ,LtpttSSignal
Low
(ICH)o---- P a s-s
Filter
Playback
Data`
D/A
411117,111
(RCH)O
Low
Pass
Filter
Playback
TM-m51.
enkrerto
li
%7791.ïc
Video Input Signal
Analoc
Sync Separator
Y11'
I6K bit RAM
CX -899
CX -890
Made By Sony
CX -7914
CX -4505P
CX -7940 Made By Sony, Toshiba, Sanyo
V.PLL
Block diagram showing basic operation of the Sony PCM -F7 Digital Audio Processor.
Technics
Model SV -P 100
Digital Audio
Cassette Recorder
Kloss Novabeam
Model Two
Portable
Projection TV
picture directly on any flat white wall.
No special curved projection screen required! This Novabeam picture can be
watched from any point in a darkened
room at full picture brightness. However, ambient light must be kept low. The
projector unit is placed four feet away
from the wall "screen."
Pricing has been set at around $2000,
but please note that the system does not
include a TV tuner. A video signal from
an already -available VCR {which contains a multi -channel tuner) must be fed
to the input of the Novabeam Model
Two. With the current trend toward separate video components and the surge of
interest expected when the FCC approves stereo TV audio, Kloss's introduction of an easy -to -use and easy-to22
position projection TV monitor couldn't
have come at a better time. With its lid
closed, the unit measures only 211/2"
high by 24V2" wide by 12" deep. It
weighs about 60 pounds.
For at least two years, everyone's been
talking about the pending "marriage" of
audio and video.. While no one manufacturer can yet be credited with pulling off
the ceremony, Kenwood certainly qualifies as one of several "matchmakers"
with its introduction of the Model KVA502 audio -video integrated amplifier.
This 50 -watt per channel amplifier can
serve as the control center of a home
audio -video entertainment room. Key
features and operating capabilities include extended audio and video dubbing
facilities, sound mixing, TV /video
sound enhancement (simulated stereo
effect), noise reduction for video tapes,
picture quality enhancement, and
straight dubbing of pictures and sound
from one VCR (or video -disc player) to
another VCR. All this is in addition to
the KVA-502's usual function as an
integrated audio amplifier for handling
audio program sources. The unit will
carry a suggested retail price of $400.
Soup and Sonatas. What do music
and supermarkets have in common?
Nothing I was aware of until I visited
Casio's winter CES exhibit. There I was
intrigued by a latter -day player pianoan electranic, computerized keyboard.
No coded paper rolls here. The user simply passes an optical scanner (lightPOPULAR ELECTRONICS
audio
Casio CT--701 electronic computerized player piano
uses a tune printed in bar code.
Kenweod Model KVA -502, with a VCR, makes an audioïvideo center
and also provides an amplifier for stereo audio.
Visitors at Winter CES sending
telegrams to Congress in
support of the right to
tape record video programs.
wand) over a printed bar code and an
encoded tune is instantly put into the
keyboard's memory. Casio has taken
regular sheet music and converted it into
bar codes -like those you see on soup
cans and breakfast cereal packages.
I was ready to regard the computerized keyboard as an amusing novelty
until discovering that, in addition to
playing back the stored melody, complete with chords and a multitude of
instrument voices (organ, flute, piano,
etc.), the keyboard can also be used as a
le arning tool. It contains a "melody
guide" of tiny lights, identifying the correct keys to be pressed, note by note.
Students needn't be able to read music!
As the unit silently displays a memorized melody, you simply follow the
APRIL.
1982
lights and press the corresponding key.
Best of all, if you hit a wrong (unlighted) key, it will not sound! Could
this be the beginning of a whole new
way to learn about music? As a Casio
demonstrator pointed out, bar -coded
representation of a melody is really no
more arbitrary than the "accepted" musical score notation.
The Right to Tape. Though CES
events are normally nonpolitical, the recent decision of the Ninth District Court
of Appeals (Los Angeles, CA) ruling
against the home videotaping of TV
broadcasts is of such far -reaching importance (audio taping might soon be
affected) that the Electronic Industries
Association (CES sponsors) opted for
direct action. They set up a booth at the
show encouraging visitors to send telegrams to their congressmen and senators
supporting pending legislation favorable
to home (noncommercial) videotaping.
Such legislation, if enacted, would effectively bypass the court decision by
amending the copyright act of 1976.
(The appeals court based its ruling
reversal of a lower court decision favorable to home taping -on the copyright
act.) If you feel that in -home videotaping of programs for later viewing doesn't
make you guilty of criminal activity, you
might want to make your feelings
known to your own legislators, too. After
all, anyone owning or planning to buy a
VCR has a stake in this important,
home -entertainment issue.
-a
23
MAXELL IS PLEASED TO PRESENTAN
EVEN HIGHER PERFORMANCE TAPE.
If you're familiar with Maxell UD -XL tapes you probably find it hard to believe that any
tape could give you higher performance.
But heanng is believing. And while we can't play our newest tape for you right here on
this page, we can replay the comments of Audio Video Magazine.
"Those who thought it was impossible to improve on Maxell's UD -XL II were mistaken.
The 1981 tape of the year award goes to Maxell XL II -S"
How does high bias XL II -S and our normal bias equivalent XL I -S give you such high
performance? By engineering smaller and more uniformly shaped epitaxial oxide particles we were able to pack more into a given area of tape. Resulting in a higher maximum
output level, improved signal -to-noise ratio and better frequency response.
To keep the particles from rubbing off on your recording heads Maxell XL -S also has
an improved binder system. And to eliminate tape deformation, XL -S comes with our unique Quin -Lok Clamp /Hub
Assembly to hold the leader firmly in place.
Of course, Maxell XL 11-S and XL I -S carry a little higher
price tag than lesser cassettes.
We think you'll find it a small price to pay for higher
IT'S WORTH IT.
performance.
24
CIRCLE NO. 32 ON FREE INFORMATION CARE)
POPULAR ELECTRONICS
Audio
e Month
CHOSEN BY Tu
!TORS OF POP
ELECTRONICS
PioneerModel CTBRCassette Deck
THE Pioneer CT -8R is a three -head,
three -motor machine featuring
built-in Dolby B and Dolby C noise reduction systems and bidirectional
playback with auto -reverse operation.
Its style matches that of other current
Pioneer audio components, finished in
satin gold with a dark brown center panel on which are displays of the signal
path through the machine and the exact
operating mode being used.
The CT -8R has a number of unusual
tape transport functions and operating
features, controlled through an internal
microprocessor system. These include
automatic tape bias and equalization
optimization, a logic-controlled solenoid
operated tape transport, and an elaborate program- search-and -selection system based on sensing unrecorded tape
segments.
Overall dimensions of the Pioneer CT8R are approximately 161/2" W X 125/s"
D X 5'/s' H. It weighs 14 lb 5 oz. Suggested retail price is $575.
General Description. The front panel
of the Pioneer CT -8R is divided into
three essentially equal parts. On the left
is a bottom- hinged door containing the
cassette guides. It opens at the touch of
the nearby EJECT button. The right third
APRIL 1982
of the panel contains almost all the operating controls, consisting of four small
knobs and a number of rectangular buttons of different sizes and shapes. The
center section (in contrasting dark
brown) contains illuminated displays of
tape transport mode, signal path, and
the internal operating conditions of the
machine.
The CT -8R tape transport uses three
miniature direct-drive motors to turn
the capstan and the two tape hubs. The
motors' speeds and torques are controlled by ICs to provide a smooth, even
wind on the hubs.
The head movement required for bidirectional play is accomplished by a
rotating head turret, whose design allows the playback head azimuth to be
adjusted separately for each direction of
tape motion. The combination record/
playback head (two separate heads in a
common housing) is shaped to insure
close, stable contact between the tape
and the head during operation.
The heads themselves are made of
Sendust alloy, formed into a ribbon by a
proprietary Pioneer process. According
to Pioneer, its Ribbon Sendust head has
a very low loss and high permeability,
which is largely responsible for the machine's excellent performance charac-
teristics. Data offered by Pioneer to
compare the magnetic and physical
properties of the Ribbon Sendust head
with conventional Sendust, Permalloy,
and ferrite core heads shows a modest
but definite superiority for Ribbon Sendust in most cases.
Automatic tape optimization systems
have been available for a few years, and
this feature is now offered in at least
some models from almost every cassette
recorder manufacturer. They vary
somewhat in operating details and their
criteria for setting the bias, equalization, and recording level; but all of them
are capable of extracting the maximum
performance from almost any kind of
tape.
Early automatic tape optimizing systems (actually, it is the recorder rather
than the tape that is optimized) required
as much as 20 to 30 seconds to perform
their adjustment cycle, but in the Pioneer CT -8R, this time has been reduced
to about 8 seconds! When the AUTO BLE
( "bias, level, equalization ") button is
pressed, the tape is first recorded with a
1 -kHz test signal and the output from
the playback head is measured. If the
output is absent or too low, the sequence
stops; otherwise the recording level is set
roughly and the bias is stepped through
25
audio
18,000 Hz. A check with our previous
tape (the TDK AC -337) showed a
± 1.5 -dB frequency response from 40 to
1111111111MIN8111
OtlB
Lo
N
ó
TD.
FREQUENCY(Hz)
Frequency responses for three different types of tape.
a sequence of levels until the output
meets an (unstated) criterion for correctness. If that condition cannot be
met, the adjustment is terminated and
the recorder is automatically set to its
internal reference bias setting for that
type of tape.
When the correct bias has been determined, its value is set into the computer
memory and the final level setting is
made. Again, if the optimum value cannot be reached, the machine reverts to
its internal preset value. The third automatic adjustment is of recording equalization, with the same default procedure
if the tape cannot be optimized. When
all three key parameters have been set
for flattest frequency response and correct output level, they are stored in the
computer memory, and the AUTO BLE
light (which has been blinking during
the process) remains on. The tape rewinds to the point at which the process
started and the machine stops, ready for
use.
Although Dolby B noise reduction has
been universally adopted by manufacturers of cassette recorders, the newer
Dolby C system is only now beginning to
appear in regular production recorders.
It is very similar in concept to the B systern, but operates at lower signal levels
and extends its noise reduction to lower
frequencies. The final result is an overall
noise reduction of about 20 dB, corn pared to the 10 dB of the Dolby B systern. A certain degree of compatibility
exists between the two systems, so that
tapes recorded with Dolby C can be
played (if necessary) on any Dolby B
machine with about the same degree of
success as would occur if a Dolby B tape
were played without any Dolby decoding in the playback. The "incompatibility" in either case is a slightly brighter
sound. However, a properly decoded
Dolby C tape will sound dramatically
quieter than a Dolby B tape, as well as
having the correct frequency response.
Laboratory
Measurements. Although the AUTO BLE system should
make the Pioneer CT -8R usable with
practically any tape, we measured its
frequency response with a number of
tapes, including TDK D, OD, SA -X,
26
and MA, as well as Maxell XL -IS and
XL -IIS. The AUTO BLE adjustment was
used for each tape before making any
measurements.
Frequency response differences between all the tapes were exceedingly
small, typically 2 to 4 dB of variation
from 10,000 to 20,000 Hz at a -20 -dB
recording level. The only exceptions to
this pattern were the Maxell XL -IS (a
"normal" ferric tape) and TDK MA
(metal), both of which gave an extremely flat response all the way to 20,000 Hz.
All the tapes had the same mid- and
low- frequency response, with moderate
"head bumps" visible between 20 and
40 Hz. The overall response was typically ± 2.5 dB from 20 to 20,000 Hz
( ±2 dB with the XL -IS and MA tapes).
If the low- frequency variations are averaged out, the overall response with XLIS or MA was within ± 1.5 dB from 20
to 20,000 Hz, which is superb performance for any cassette deck. For our full
tests of the CT -8R, we used Maxell XLIS (normal), Maxell XL -IIS (CrO2)
and TDK MA (metal).
When the response was measured at a
0 -dB recording level, the differences between the tapes were slightly more visible. However, one of the most unusual
characteristics of the frequency response was that the 0 -dB curve did not
intersect the -20 -dB curve, up to
20,000 Hz, with any of the tapes. This
indicates the superior quality of the Pioneer recording head, which evidently
requires less recording equalization
boost at high frequencies than do less
efficient heads (and thus produces less
tape saturation). The MPX filter, designed to remove any 19 -kHz pilot carrier from an FM signal being recorded,
was highly effective. It had virtually no
effect on the response up to about
16,500 Hz, and cut off rapidly above
that frequency.
The playback equalization of the CT8R was checked using the new standard
calibration tapes from BASF, whose recorded frequencies span from 31.5 to
18,000 Hz (previous tapes were limited
to 12,500 Hz). The 70- and 120 -As playback responses were essentially identical, within ± 1.5 dB from 31.5 to 12,000
or 14,000 Hz, and rising 4 or 5 dB at
12,500 Hz.
At the maximum gain setting, a 0 -dB
recording level indication required a line
input of 63 mV. The microphone sensitivity was 0.27 mV, with overload occurring at 48 mV. Since plugging in one
microphone jack replaces only its corresponding line input, it is not possible to
make a mono recording from a single
microphone unless an external "Y" connection is used.
The playback output from a 0 -dB signal was in the range of 0.64 to 0.68 V,
depending on the tape used. The third
harmonic distortion in the playback
from a 0 -dB, 1000 -Hz recorded reference signal was down 41 to 42 dB for
Maxell XL -IIS and TDK MA, and 47
dB for Maxell XL -IS. To reach a reference playback distortion of 3% (third
harmonic down 32 dB) we had to record
at 5.5 dB above reference with XL -IIS
and at 7 dB above reference with the
other two tapes.
Referred to the playback from those
recording levels, the unweighted S/N in
the output was 50.5 dB (XL -IS), 51.5
dB (XL -IIS) and 52.5 dB (MA). With
CCIR /ARM weighting and using Dolby B noise reduction, those readings
improved to 62.2, 66.2, and 66.4 dB.
Finally, with Dolby C, the S/N readings
were impressively high, respectively 73,
74, and 74.5 dB for the three tapes.
The Dolby tracking (the change in
overall record /playback frequency response with Dolby on or off, at various
recording levels) was excellent. With
Dolby B, the response changes were visible only above 10,000 Hz and did not
exceed dB up to 15,000 Hz, for recording levels between 0 and -30 dB (TDK
MA tape). The results with Dolby C
were also good, with smooth variations
in output (1.5 to 2 dB) at various frequencies up to 15,000 Hz.
A standard Dolby level -test tape produced a +3 -dB reading on the CT -8R's
LED display. The LEDs responded very
rapidly, giving the same readings on
steady signals or on 0.3- second tone
bursts. The tape transport, which ran
about 0.65% fast, moved a C60 cassette
from end to end in 110 seconds (fast forward) or 114 seconds (rewind). The
weighted peak flutter (CCIR) was
±0.05% and the weighted rms flutter
(JIS) was 0.03 %, both very low readings
for a cassette deck.
1
User Comment. The recording and
playback performance of the Pioneer
CT -8R are so outstanding that little
additional comment is needed. Recording and playing back records, FM programs, and even interstation FM tuner
hiss did not reveal any significant difference in sound between the incoming program and the playback. This was the
case even at indicated recording levels of
0 dB, which normally result in dulled
high- frequency output due to tape saturation. We have never used a cassette
POPULAR ELECTRONICS
audio
deck that could surpass this performance, and very few can even come
close to matching it. Even without considering the many special operating features of the CT -8R, its basic performance alone would justify its price.
Not long ago, the better open -reel
home -type tape recorders could not
match the flutter readings of the CT8R, even at 15 inches per second. None
of the several automatic tape optimizing
systems we have used were any more
effective than the AUTO BLE, and all of
them were much slower in operation.
We found only one operating flaw in
the CT -8R. Cassettes lacking rear
notches to identify the tape type cannot
be used properly in this machine (they
will be automatically assigned the 120µs playback equalization). We have a
number of early Advent chromium dioxide tapes that will never sound right
on the CT -8R because there is no way to
select the 70 -As equalization manually.
There was a similar problem in trying to
test the machine with different metal
tapes, since few of our early samples had
the rear keying holes. A manual tape
selection override would have been a
most desirable feature on this deck.
The proximity of the EJECT button to
the edge of the cassette door requires
considerable care when opening the
door, which can easily be blocked by the
tip of the finger that is pressing the button. Left- handed operation of the button
would be extremely awkward.
Experience with other recent Pioneer
components featuring the same styling
as the CT -8R has left us with strong
positive feelings about the informative
center display panel. The signal flow
and function display is both attractive
and useful. In view of the many special
control features of the CT -8R, a clearly
visible display of its operating modes
would seem to be a virtual necessity.
We used all of the special features of
the CT -8R to verify their operation.
Everything worked exactly as described
in the instructions. However, this is not
a machine that can be used to full
advantage without a careful study of the
manual, and considerable practice. Until the use of all the buttons becomes
automatic on the part of the user, the
CT -8R can be a formidable challenge.
Fortunately, it can be used as a perfectly conventional cassette deck, without bothering about its various search
and fast -scan modes. We chose to do
just that, since it became obvious that
sustained practice would be needed to
use any of these modes effectively.
The "bottom line" of our evaluation of
the Pioneer CT -8R is that it is one of the
finest cassette recorders we have used
and is an exceptional value in its price
range. Its basic performance- frequency response, distortion, S /N, and flutter -would be very difficult to surpass
at any price. And once its special tape handling features are mastered, it offers
another good reason to choose the CT8R. The unit earns top honors as a
superb cassette recorder at a surprisingly low price. -Julian Hirsch.
CIRCLE NO. 101 ON FREE INFORMATION CARD
PIONEER CT -8R CONTROLS AND INDICATORS
Front Panel
PAUSE
Knobs
INPUT
OUTPUT
MODE
TIMER
Concentric L and R channel recording level controls.
Playback program level
control.
Three -position switch for
normal stop at end of
tape, auto- reverse (playback only), and autoreverse with four complete plays before stopping.
Three -position
switch
for unattended operation with external ac power switched
by timer.
Flat plates for fast forward, rewind and reversing tape direction, identified by arrow symbols.
PLAY and STOP controlled
by
pressing opposite
ends of a single large
plate.
REC
REC MUTE
MS/SKIP
INDEX SCAN
Pushbuttons
EJECT
POWER
AUTO BLE
CLEAR
BLANK SEARCH
APRIL 1982
Opens cassette door.
Controls ac line power to
recorder.
Activates automatic system for optimizing tape
bias, level, and equalization.
Clears AUTO BLE data, replacing with reference
values built into machine.
Puts tape in fast forward
until a nonrecorded segment of at least 8 seconds is encountered. At
that point, tape stops and
is positioned to play following section.
Display Panel Features
COUNTER
LEVEL
AUTO REVERSE
ing head to add silent in-
(OFF, REC, PLAY)
Operations
Switches
Alternate pressures stop
and start tape without affecting operating mode
(not operative in fast
speeds).
Single red button initiates
recording mode of operation.
While held in during recording, removes incoming program from record-
MUSIC REPEAT
MEMORY
MONITOR
terval to tape.
When set to ON, pressing
the fast -forward or rewind
control moves the tape to
beginning of next recorded selection and resumes play from that
point. Cancelled by second operation.
Causes tape to scan in
fast speed in direction set
by
operations switch.
Stops at each recorded
section, plays 7 seconds,
and resumes scan until either PLAY Or STOP is
pressed.
Pressing during playback
causes selection to be repeated up to 8 times (or
until cancelled by pressing one of the operations
switches).
Push to ON to engage
AUTO STOP at 000 counter
reading in fast speeds.
Connects line outputs to
RECORDING MODE
TAPE AUTO
SELECT
AUTO BLE
DOLBY TYPE
Three small buttons turn
on Dolby system, select B
or C system, and engage
the MPX filter.
back) Or SOURCE.
Lights Show NORM, Cr02,
METAL selection of bias
and playback EO according to index holes on the
back of the cassette.
Green AUTO DATA light
flashes while automatic
tape optimization is in
progress, speeding up as
it continues and remaining
on when it is complete.
Letters B or C illuminate
showing the Dolby system in use.
Jacks
MIC
(L and R)
TAPE Or SOURCE.
DOLBY NR
Three -digit mechanical index counter with reset
button.
Two vertical rows of LEDs
reading
instantaneous
program levels from -20
to +8 dB.
Green, lighted arrows and
bar pattern to show travel / stop status of tape.
Rate of light movement
shows speed and direction. Arrows show when
machine is set for autoreverse.
Lights show REC, PAUSE,
and REC MUTE status. Arrows show whether MONITOR is set to TAPE (play-
PHONES
These 1i4" jacks automatically replace the rear line
inputs when microphone
plugs are inserted (mono
recording not possible
with single microphone).
Stereo headphone jack.
Rear Panel
LINE IN, LINE OUT
Phono jacks.
27
Why use their flexible discs:
Athana, BASF, Control Data, Dysan, IBM, Maxell, Nashua,
Scotch, Shugart, Syncom, 3M, Verbatim or Wabash
when you could be using
MEMOREX
high quality error free discs?
CE quant.
100 price
per disc ($)
Part #
Product Description
8"
8"
8"
8"
8"
8"
8"
SSSD IBM Compatible (128 B/S, 26 Sectors)
SSSD Shugart Compatible, 32 Hard Sector
SSDD IBM Compatible (128 B /S, 26 Sectors)
DSDD Soft Sector (Unformatted)
DSDD Soft Sector (128 B /S, 26 Sectors)
DSDD Soft Sector (1024 B/S, 8 Sectors)
DSDD Burroughs B -80 Comp., 32 Hard Sector
51/4" SSSD Soft Sector (Unformatted)
51/4" SSDD Soft Sector w/Hub Ring
51/4" SSDD 10 Hard Sector w/Hub Ring
51/4" SSDD 16 Hard Sector w/Hub Ring
51/4" DSDD Soft Sector w/Hub Ring
51/4" DSDD 10 Hard Sector w/Hub Ring
51/4" DSDD 16 Hard Sector w/Hub Ring
3062
3015
3090
3102
3115
3104
3092
3401
3481
3483
3485
3491
3493
3495
2.09
2.09
2.74
3.14
3.34
3.34
3.34
1.94
2.34
2.34
2.34
3.09
3.09
3.09
SSSD = Single Sided Single Density; SSDD = Single Sided Double Density
DSDD = Double Sided Double Density
Memorex Flexible Discs...The Ultimate in Memory Excellence
Quality
Memorex means quality products that you can depend
on. Quality control at Memorex means starting with the
best materials available. Continual surveillance throughout the entire manufacturing process. The benefit of
Memorex's years of experience in magnetic media production, resulting, for instance, in proprietary coating
formulations. The most sophisticated testing procedures you'll find anywhere in the business.
100 Percent Error Free
Each and every Memorex Flexible Disc is certified to be
100 percent error free. Each track of each flexible disc
is tested, individually, to Memorex's stringent standards
of excellence. They test signal amplitude, resolution,
low -pass modulation, overwrite, missing pulse error
and extra pulse error. They are torque -tested, and
competitively tested on drives available from almost
every major drive manufacturer in the industry including drives that Memorex manufacturers. Rigid quality
audits are built into every step of the manmanufacturing
process and stringent testing result in a standard of
excellence that assures you, our customer, of a quality
product designed for increased data reliability and
consistent top performance.
Customer- Oriented Packaging
Memorex's commitment to excellent does not stop
with a quality product. They are proud of their flexible
discs and they package them with pride. Both their
packaging and their labeling have been designed with
your ease of identification and use in mind. The desktop box containing ten discs is convenient forfiling and
storage. Both box labels and jacket labels provide full
information on compatibility, density, sectoring, and
record length. Envelopes with multi -language care and
handling instructions and and color-coded removable
labels are included. A write -protect feature is available
to provide data security.
Full One Year Warranty -Your Assurance of Quality
Memorex Flexible Discs will be replaced free of charge
by Memorex if they are found to be defective in materials
or workmanship within one year of the date of purchase.
Other than replacement, Memorex will not be responsible for any damages or losses (including consequential
damages) caused by the use of Memorex Flexible
Discs.
Quantity Discounts Available
Memorex Flexible Discs are packed 10 discs to a
carton and 10 cartons to a case. Please order only in
increments of 100 units for quantity 100 pricing. We
are also willing to accommodate your smaller orders.
Quantities less than 100 units are available in increments of 10 units at a 10% surcharge. Quantity
discounts are also available. Order 500 or more discs
at the same time and deduct %; 1,000 or more saves
you 2 %; 2,000 or more saves you 3 %; 5,000 or more
saves you 4 %; 10,000 or more saves you 5 %; 25,000 or
more saves you 6 %; 50,000 or more saves you 7% and
100,000 or more discs earns you an 8% discount off our
super low quantity 100 price. Almost all Memorex
Flexible Discs are immediately available from CE. Our
warehouse facilities are equipped to help us get you
the quality product you need, when you need it. If you
need further assistance to find the flexible disc that's
right for you, call the Memorex compatibility hotline.
Dial 800 -538 -8080 and ask for the flexible disc hotline
extension 0997. In California dial 800 -672 -3525 extension 0997. Outside the U.S.A. dial 408-987 -0997.
Buy with Confidence
High Quality
Error Free
VISA
1
(MasterCard'',
Order Toll -Free!
(800) 521 -4414
In
Michigan (3131994-4444
To get the fastest delivery from CE of your Memorex Flexible
Discs, send or phone your order directly to our Computer
Products Division. Be sure to calculate your price using the CE
prices in this ad. Michigan residents please add 4% sales tax.
Written purchase orders are accepted from approved government agencies and most well rated firms at a 30% surcharge
for net 30 billing. All sales are subject to availability, acceptance
and verification. All sales are final. Prices, terms and specifications are subject to change without notice. Out of stock
items will be placed on backorder automatically unless CE is
instructed differently. Minimum order $50.00. International
orders are invited with a$20.00 surcharge for special handling
in addition to shipping charges. All shipments are F.O.B. Ann
Arbor, Michigan. No COD's please. Non -certified and foreign
checks require bank clearance.
Mail orders to Communications Electronics, Box 1002.
Ann Arbor, Michigan 48106 U.S.A. Add $8.00 per case or
partial -case of 100 8 -inch discs or $6.00 per case or partial
case of 1005'. -inch mini -discs for U.P.S. ground shipping and
handling in the continental U.S.A. If you have a MasterCard or
Visa card, you may call anytime and place a credit card order.
Order toll -free in the U.S. Call anytime 800 -521 -4414. If you
If you are outside the U.S. or in Michigan, dial 313- 994 -4444.
Order your high quality, error free Memorex discs today.
Copyright '1982 Communications Electronics'
CIRCLE
NO
I
ON
FREE
INFORMATION
CARD
For Data
Reliability- Memorex Flexible Discs
TM
MCOMMUNICATIONS
ELECTRONICS''
Computer Products Division
O Box 1002 O Ann Arbor, Michigan 48106 U.S.A.
Call TOLL -FREE (8001521-4414 or outside U.S.A. (313) 994-4444
854 Phoenix
video
Popular Electronics Tests
Magnavox 19 "Color "PhoenixChassis
THE "Phoenix chassis has arrived.
This new modular chassis will first
be installed in the company's existing
T809 and T815 cabinets, until the entire
line is converted during model year
1982. It represents an overall advance in
Magnavox's fine earlier chassis.
Gonoral Description. We reviewed
the BB4242WA01 19 -inch table model,
which already uses the new Phoenix
chassis. It has an MV19VMFP22 90°
Sylvania picture tube; 10-key direct address, frequency- locked and synthesized tuner with 105 uhf /vhf/CATV
channels; light- dependent resistor for
tracking room lighting changes; tone
and volume controls; and a "V- Matic"
arrangement for those who can't manage manual tuning. Under the front
apron are thumbwheel controls for
brightness, picture, tint, and color.
Around back you'll find sharpness, vertical hold, and a normal /CATV
switch.
Up front, inside the cabinet, is a 4-by6 -inch oval speaker; separate, shielded
tuner packages with controls; a plug -in
comb filter; and aluminum heat sinks
for horizontal, vertical, and audio outputs. There are also trimmers for sub
brightness; red, blue, and green drives
and cutoffs; vertical height; horizontal
hold; volume; and the 3.58 -MHz oscillator. Focus and G2 potentiometers are on
a separate board. Suggested retail price
is $550.
The signal board is the larger of the
APRIL 1982
set's two main pc boards. It holds three
integrated circuits, 13 transistors, three
plug -in tuner packages (and their controls), the i -f amplifiers, and a comb filter. Five hex -head screws and several
plastic connectors remove tuner and
controls, allowing the signal board to be
easily extracted. The board includes the
sound processor, the sync processor, and
the chroma luminance processor, as well
as discrete vertical outputs, RG &B amplifiers, and a horizontal pre- driver.
Let's briefly discuss some of the ICs.
The sync processor is a Sanyo
LA1460 containing the vertical and horizontal oscillators, sync separator, vertical SAW and vertical pre-driver outputs, burst -gate pulse, automatic frequency control, and video inputs and
outputs. Obviously, this 22 -pin IC is
fairly complex, and uses differential amplifiers as well as gates, flip -flops and
diodes. It does not, however, possess a
separately tuned high -frequency oscillator for the IC counter. Thus, both horizontal and vertical holds are included.
Vertical hold is a customer control.
The chroma /luma processor is the
major chip in the set, with 28 pins
and a number of separate video and
color functions. The IC is designated
izPC1352C or AN5310 by Nippon Electric and Matsushita, respectively. All
oscillator and interstage transformers
have been eliminated; there is diode protection against stray transients; and
color and contrast controls are interlocked.
A Philips TDA2541 chip contains a
gain -controlled, wide -band amplifier
with video preamplifier, synchronous
video detector, agc circuit with noiseprevent gating, and automatic fine tuning that can be switched on and off by dc
levels. It is preceded by a surface -wave
acoustical filter and preamplifier that
effectively rejects most CB intrusion
and other interference.
Inputs to the TDA2541 enter a gain controlled amplifier, which supplies
midpoint 44 -MHz i -f frequencies to
both a synchronous video demodulator
and tuned reference amplifier. The automatic fine tuning receives a 45.75 MHz video carrier from the reference
amplifier and delivers a filtered dc correction voltage to the tuners, restoring
any frequency deviation from assigned
channels. Full -wave detected video (free
of spurious high- frequency transients)
then reaches the video preamplifier and
its white spot (peak reduction) inverter.
The signal then returns to a combined
automatic gain detector and noise inverter, where filtered dc voltages prevent i -f and tuner overloads.
Plugged into the Signal Board is a
"high- resolution filter" that's a simplified version of comb filters used in other
Magnavox units.
The power board, as its name implies,
delivers ac into the receiver, where it is
rectified. The board is protected against
high -voltage spikes by a metal -oxide
sink and a 5 -A fuse. A startup transformer and rectifier supply initial poten29
video
MAGNAVOX 19" MODEL BB4242WA01
LABORATORY DATA
Parameter
Measurement
Tuner /receiver sensitivity (before snow):
vhf (Ch. 3):
uhf (Ch. 20):
Voltage regulation (with signal applied
and ac varied between 105 and 130V):
Low voltage: 12 -V supply -98.6 °/o
110 -V supply -97%
High voltage: 25 -kV supply- 96.2%
S / N ratio at CRT:
42 dB
83%
4 MHz
4 MHz
63 dB
Dc restoration:
Luminance bandpass at video detector:
Luminance bandpass at CRT:
Agc swing from saturation to cutoff:
CRT color temperature:
Horizontal overscan:
Convergence:
Power requirements (signal applied):
-8 dBmV
-3 dBmV
7400 °K
Spectrum analysis of video
at the cathode ray tube
shows an excellent S /N.
11%
98%
100 W (avg.)
Note: Instruments used in these measurements are: Tektronix 7L12/7L5 spectrum analyzers; Talequipment D66,
D67A oscilloscopes; Sadelco FS -3D VU f/s meter; Winegard DX -300 amplifier; Data Precision 245, 258, 1750
multimeters; B 8 K- Precision 1250 and 3020 NTSC and sweep /function generators and PR57 power supply; Tektronix C -5A and Minolta XD-11 cameras; and Gossen Luna -Pro light meter.
tial for horizontal driver kickoff and
then a switch -mode power supply with
SCR regulator takes over as soon as flyback operation begins at 15,734 Hz. A
three -transistor comparator, latch, and
shutdown circuit protects the receiver
from excess high -voltage runaway. On
this board there are no ICs.
Comments. Totally modular (including the removable U/V /CATV tuners
and tuner controls), this receiver is
Multiburst shows 4 -MHz luma
response at video detector (top)
and at CRT (bottom).
equally serviceable in the home or shop,
and features highly identifiable stenciled test points. Its well -regulated voltages, sharp convergences, full agc swing,
good tuner sensitivity, color temperature, and signal -to -noise measurements
allow us to confidently applaud the
design and performance of this set.
If we had any criticism, it would be in
the 4.08 -MHz chroma roll -off, and
somewhat wide vector petals. You won't
notice it in the video pictures, however.
Chroma and vector patterns are good.
The 4.08-MHz trace at CRT shows
some loss of signal strength.
The waveform photos show some degradation at the higher chroma frequencies,
but the vector indicates nothing more
than a slightly extended chroma band pass. This results in rise and fall times
that are a bit longer than optimum.
Otherwise, as both oscilloscope and
spectrum analyzer illustrate, luma and
chroma, including a full 4-MHz bandwidth at the CRT, are considerably better than most high -end competition, and
represent a real improvement over just
about any set in this price range.
-Stan Prentiss
CIRCLE NO. 103 ON FREE INFORMATION CARD
The modular chassis construction
is easily serviceable at home
or in the shop with
well-identified test points.
30
POPULAR ELECTRONICS
computers
Popular Electronics Tests
Intelligent Systems Model 365!
MicrocomputerSystem
WITTING into
a unique class of
equipment called intelligent terminais, the Model 3651 desktop microcomputer system from Intelligent Systems Corp. features an 8080 microprocessor, 5048 CRT controller, built -in
single- density 5.25 -in. floppy disk, RS232 serial port, and expansion port. Typical pricing for the Model 3651 with a
72 -to -117 incremental keyboard, 32K
bytes for RAM, and a single- density
disk drive is $2355. For software such as
FORTRAN, Editors, Assemblers, and
games, expect to pay from $20 to $300.
You can use any soft -sectored 5.25 -in.
diskettes with the system, but ISC
charges only $4 for formatted diskettes.
Buy them directly and save up to $20.
The 13 -in. diagonal CRT can display
eight foreground and eight background
colors: red, green, blue, yellow, magenta, cyan, black, and white. The display
format is 64 ASCII characters arranged
in a 5 by 7 matrix using a 6 by 8 character cell. There are 64 characters per
line and 32 lines per screen (or when
operating with double -sized characters,
16 lines per screen). In addition, the unit
displays 64 special graphics characters
in a 6 by 8 matrix and offers a resolution
of 128 by 128 for vector -style graphics.
Although the unit has the ability to display upper /lower case, as configured
only upper case is supported. You can
either write your own PROM or order a
APRIL 1982
full upper /lower case character generator from ISC.
The 8080 microprocessor operates at
2 MHz and can address up to 64K bytes
of RAM, however, the unit under evaluation had only 32K bytes. In addition to
RAM, the unit sports 16K bytes of
ROM that contains the operating system and BASIC. An additional 8K
bytes of ROM can be added for plot function keys which was the case in the
unit tested.
The Model 3651 arranges memory
with 4K bytes of RAM used for CRT
screen refresh, 4K bytes for disk buffer,
and up to 32K bytes for user programs.
Although the latter memory space may
appear as a restriction, it isn't since the
system is designed to work in concert
with a larger system as a graphics display and input terminal.
To support the function as a terminal
and to work as a stand -alone unit, the
Model 3651 has a user -programmable
RS -232 serial port for connection either
to a printer or modem and can operate
from 110 to 9600 baud. The 50 -pin
extension bus permits interfacing to a
variety of equipment including an
STOZ80 bus.
Software Features. The Intelligent
Systems computer has a number of
built-in software features that make it
an exciting machine. Editing functions,
for example, include a page -roll mode
which permits paging of large listings,
and the ability to erase a line or a page
(insert /delete).
Included in the ROM code is an
extended disk BASÌC that uses 27 statements. Because the Model 3651 is designed to handle graphics, 18 -math
functions are included, as well as nine
string functions.
Not CP /M. Although the ISC system
does support disk I /O, the control program isn't CP/M. For this model, ISC
elected to employ a file control system
that permits twelve functions: COPY,
DELETE, DEVICE, DIRECTORY, EXECUTIVE, INITIALIZE, LOAD, READ, RENAME,
RUN, SAVE, and WRITE. It will backup,
duplicate, merge, print, and file files,
and it also has the unique ability to save
or load a graphics screen. This latter
attribute makes it possible to call a
graphics screen off the disk in a background operation, and have it displayed
instantly rather than redrawing it.
Should you be more comfortable with
CP /M, ISC offers other intelligent terminals that use this popular operating
system.
The 3651 can support up to three
5.25 -in. drives and four 8 -in. drives. The
former is single- density with 92,160
bytes per drive or 184,320 bytes for the
double -density version. The 8 -in. models
31
ctland
çtröniç
Memory
8/14.95
8/17.95
41 16 -250nS
4116 -200nS
164 -200nS
12
95 ea 8/99.95
8/17.95
2114L
6116 2K x 8 CMOS RAM 200nS ....
1295
3.49
2708 EPROM
5.49
2716 EPROM
12.99
2732 EPROM
34.95
2764 EPROM
24.95
Z6132 4K x 8 Quasi- Static RAM ..
Microprocessor
21L02
2112
2516
2532
2.39 8212.
5.49 8214 ...
12.99 8216
12.95 8224
4044L-2
.
6802
+
-
DAC- 0800... 3.99
1NS8250... 14.90
MM58167... 8.75
TMS9900
29.95
TR16028... 2.49
2 75 SC -01
279
55 00
.
3.29 Z80A-CPU.
2,49 8226
8.99 8228
6.99 8251
11 95 8255
19.95 AY5.10134
4.95 A75.2376
6502
Interface
Et
18.49
4.49
8 95
2.75
3.95
1
2651
6800
...
24.50 6845
34.95 6850
49 8085A
Z8OACTC
7.95
7.49
...
4.49 Z8OADart .. 19,95
6.95 Z80APIO
649
4
'
4
7.49
17.95
74.95
29 95
.
Z8OASIO
95 Z8603
95 Z8671
/435
6883
,9.95
Amp TO -220 Voltage Regulators
1
PART
7805
7812
7815
7818
#
1
(LM340T -5)
(LM340T -12)
(LM340T -1 5)
(LM340T -18)
-24
25 -99 100 -499
.85
.85
.75
.75
.65
.65
.85
.85
.75
.75
.65
.65
Linear Integrated Circuits
8038
3.95 LM393 ..
LF351
.75
1.29
1.39
45
49
LF353
LF357
LM301
LM307
LM311
LM318 ...
LM324
LM339
LM358 ..
LM377
...
LM380 N-14
LM381
LM383
LM384
LM386
LM387
..
.
LM733
LM741 -8
LM741 -14
LM747
LM748 ...
.
77
.
.95 LM1310
1.75 LM1458
97
.99
.35
35
49
2.49
... .69
... 2.49
_
_
_
1
1
.
....
.
.
.
1
90 LM1800
79 LM1818 _._ 3.49
90 LM1889
2.99
.69
2 49 LM2900
25 LM3900 ...
89
.. 1.49
89 LM3905
... 3.79
3 29 LM3914
95 LM3915 ... 3.79
.99 LM3916
.. 3.79 XR4741
._ 3.29 58558
1.49 LM4500
1
.
MC3302 .... 90
.59
MC1458
MC1514
1.39
NE555 ... .. .45
NE556
.98
NE565
.25
NE5534 .... 2.35
NE5538 ...
2.25
SSM2010 ... 7.50
SSM2020... 7.50
SSM2030... 7.50
SS M2040... 7.50
SS M2044... 5.75
SSM2055... 6.50
XR2206 .. 5.19
XR4136
99
1.95
1.99
5% Carbon Film Resistors
We stock all 5% standard values between
Ohm and
Meg Ohm.
1
1
Y.
Watt
20
Package of 5
Package of 100 one value)
Package of 1000 (one value)
'/z
1.65
12.00
Watt
25
1.75
Package of 5
Package of 100 (one value)
Package of 1000 (one value)
15.00
Sampler box consisting of 5 each of all 145
standard 5% values between
Ohm and
1
1
Meg Ohm.
/. Watt Sampler Box
Yz Watt Sampler Box
10 -24.99
25-49.99
22.00
27.00
Minimum Order $10.00
Shipping
FREE
3.00 Above 50.00.
1.50 C.0 D
Add 1.65
.
WESTLAND ELECTRONICS
Westland, Mi 48185
37387 Ford Rd.
Order Line - 1- 800 -521 -0664
In
32
Michigan
- 313 -728 -0650
CIRCLE NO.49 ON FREE INFORMATION CARD
computers
handle 295,680 bytes single-density and
591,360 bytes in double- density.
The 3651 is housed in a plastic package that measures 13.75 in. high by
19.75 in. wide by 27 in. deep including
the built -in keyboard. Total weight of
the system is 51 lb.
Evaluation. The Model 3651 under
test came with a printed warning that it
has not been tested for compliance with
FCC rules for RFI or EMI emissions,
and may cause interference. The system
does in fact generate interference that
was found to cover a broad spectrum of
channels, including 2, 3, 4, 7, 13, and 32.
On opening the unit, we found no serious
attempt at shielding or adequate signal
grounding. Interestingly, though, we
found no ringing on the bus while the
processor was active, nor any interference to the integrated disk drive. However, we did notice some slight ballooning of the display on disk access.
At turn-on (rear -apron switch), the
system immediately comes up in
BASIC. The manual warns that the cap
lock key must be down to enter uppercase characters. In the lower -case mode,
you get the 64 special characters -as
previously mentioned, no lower case.
Reset is accomplished by depressing
the RESET key on the upper right -hand
corner. Doing so results in a green -andcyan display in normal- height characters saying: CRT MODE V9.80. When
first turned on, however, the system
comes up in BASIC giving the version
(in this case 9.80) and the number of
unused bytes available (32,094). You
can achieve the same result by holding
down the COMMAND key on the left hand auxiliary keypad and depressing
RESET.
The CONTROL, or COMMAND, key on
the auxiliary keypad is used to switch
the foreground and background colors.
This is accomplished by depressing either key and the appropriate color key.
To select a black background, for example, tap either of the previously mentioned keys and either the black key on
the auxiliary keypad or the P key. To
select a foreground color, tap the FLG
ON /FLG OFF function key on the top row
and again depress CONTROL or COMMAND and the desired color key.
We employ a single -speed test to show
the power of a microsystem. This test is
designed to push the contents of memory
onto the system stack until memory limits are reached, pointers are lost (a condition that occurs in many two -level
BASIC implementations), or an error is
produced.
The test consists of entering one
BASIC statement -10 GOSUB 10running it, and noting the time elapsed
before an error or out -of- memory condition is produced. In the case of the ISC
unit we tested, 1.9 seconds were required for the out-of- memory error to
display. Although neither the system,
nor its BASIC can be considered fast,
this creates no problem since the machine isn't intended to be used as a num-
ber cruncher or a speed demon.
Surprisingly, this speed limitation is
least critical for graphics display. Most
of the high -speed calculations are done
on a host with the ISC system serving as
an output device. The plotting speed is
directly related to the stack operation
and (as such) is slow -but with very
good resolution.
Normally, we test a unit's file-handling capability using specialized programs that check the read /write channels, error capability of the machine,
and so forth. We ran these programs
and found the disk handling to be slow
but accurate. We also discovered that
ISC likes to rely on memory- resident
data for display, and treats disk systems
almost as very slow virtual memory.
Conclusion. The 3651 shouldn't be
confused with systems designed specifically for business. It should, however, be
looked on favorably as a graphics input/
output terminal device for use in special
applications.
The unit we reviewed reminded us of
the CompuColor Imagination Machine,
which was discontinued because of RFI
problems. The 3651 appears to be the
Imagination Machine repackaged in a
unitized enclosure. And the software
supplied is identical to that made available with the previous design.
We are intrigued that ISC chose the
mature and extremely economical 8080
microprocessor for the 3651's CPU, and
that the 3651 contains a low -level file
management system when the trend is
toward more powerful operating systems-even for "intelligent" graphics
terminals. However, we felt that upper/
lower case should have been standard,
and it would be nice to have an LED display on the disk drive so activity can be
observed.
We did like the way the keyboard was
laid out and the use of special keys to
handle mundane tasks like resetting,
booting, clearing the screen and so forth.
Here, improvement over the Imagination Machine was quite noticeable. Furthermore, we really liked the 3651's
ability to rapidly change foreground/
background colors, to set up nine scrolling windows, and to generate well over
4000 color shades.
The 3651 is a powerful color graphics
system with exceptionally good video
presentation for data. Its NTSC raster
scan was exceptionally tight and sharp
and free of flicker. ISC offers a full
range of options to make the machine
even more powerful, including a CP /M
update, and a host of user-oriented
applications such as a full -featured
word -processor package.
Should you be interested in computer
graphics, approach the buying decision
carefully. If color capability is really
important then you can't go too far
wrong with the ISC Model 3651. Be
aware, though, that ISC offers many
options and it's up to you to specify the
correct mixture. -Carl Warren
CIRCLE NO. 102 ON FREE INFORMATION CARD
-
GET THE
COMPLETE
GUIDE!
If building electronics projects turns
you on, you'll definitely want a copy
of the 1982 ELECTRONIC EXPERIMENTER'S HANDBOOK! This brand new edition is filled with dozens of plans, for
constructing a wide variety of practical and
entertaining home electronic devices you
can put together in your own workshop!
Here's just a partial listing of what you'll
find in the HANDBOOK, with construction
costs for many of the projects:
NASA MOTOR CONTROLLER -Use
space -age technology to optimize the power
consumption of nearly any appliance that
uses a motor. About $36.
AUDIO SOUND -EFFECTS MACHINE
Create an almost unlimited range of sound
effects for your tape recordings. About $25.
ADD I/O PORTS TO A MICROCOMPUTER -Learn about computer port operation and how to use ports for added computer flexibility.
BUILD A TRUE RMS VOLTMETER
Measures true effective AC voltage, instead
of the usual average voltage. About $75.
VIDEO ENHANCER WITH COPYGUARD STABILIZER -Copy tapes from
one VCR to another with little or no loss of
quality. About $110.
STEREO PARAMETRIC EQUALIZER
Tailor the sound of your stereo system to
the room and equipment characteristics.
About $100.
DYNAMIC AUDIO FILTER -Clean up the
signals from radio, tape or records in nearly
any stereo system. About $160.
55 MPH "CRUISE ALERT " -Sounds an
alarm when your car exceeds 55 mph.
About $30.
-
-
-
From the editors of
SOLID-STATE HUMIDITY CONTROL
Feel more comfortable at lower thermostat
settings by adding this circuit to your
humidification system. About $30.
CLIPPING INDICATOR FOR YOUR
AUDIO AMPLIFIER Protect your speakers with this voltage sensor that flashes a
warning LED before the onset of clipping.
About $20.
ULTRASONIC SOUND DETECTOR
Converts ultrasonic sounds to the human
audio range, from insect noises to compressed gas leaks. About $25.
POPULAR ELECTRONICS:
INN
ElEC7ROMC
EXPEMMENTERS
-
Va\Ma,
An
cleavweooupYicaeing
-
COMPUTER "CONTROL CENTER"
CIRCUITS -Modify your small computer
to perform external operations.
PRECISION POWER SUPPLY FOR
YOUR WORKSHOP -This simple project
furnishes 1.25 to 33 volts and up to 1.5 amperes with excellent regulation.
About $35.
TRIGGERED SWEEP FOR OSCILLOSCOPES- Add -on test equipment circuit
increases performance by permitting expansion of waveforms. About $20.
PLAY "SPACE BATTLE" ON YOUR
VIDEO MONITOR -An exciting visual
game program for any computer using an
There's more-over 30 exciting, useful projects in all. Get the complete plans in the
1982 ELECTRONIC EXPERIMENTER'S
HANDBOOK, and start building the ones
you want!
USE THE COUPON TO
ORDER YOUR COPY NOW!
only $2.95!
RCA COSMAC 1802 CPU.
ELECTRONIC
EXPERIMENTER'S HANDBOOK
BUILD A PSYCHO -ACOUSTIC "WHITE
SOUND" PROJECTOR-Device simulates
the sound of surf, gentle rain or white noise
to provide a tranquil background for work
or sleep. About $30.
LOW COST R -F BRIDGE Perform complete impedence measurements on R and X
components over a wide frequency range.
P.O. Box 340, Broomall, PA 19008
YES! Send me the 1982 ELECTRONIC
EXPERIMENTER'S HANDBOOK. Enclosed is $3.95 ($2.95* lus $1.00 postage and
handling). $5.00 outside U.S.A.
-
Mr.
Mrs.
Ms.
-
(please prim full narne)
WALL-LIGHT "SMART" SWITCH
Build a simple, solid -state switch that
remembers to turn off lights when you forget. About $20.
AM LOOP ANTENNA -An easy-toconstruct air-core loop antenna that extends
AM reception for inexpensive radio
receivers.
`',1982
COw8TRUCTOM MANS FOR
Address
Apt.
City
State /Zip
.' Residentsof CA. CO. Dl'. Ft., IL.. M.A. MI. \t0. .1_
Slate. OH. SC. T\ and VT add appli.ahle .ales t.is_
\ \
L
1
Everjyjbodys making money
microcomputers.
to malte money
servicing them.
seuiun
New NRI Home -Study Course Shows You How to Make Money Servicing, Repairing,
and Programming Personal and Small Business Computers
34
POPULAR ELECTRONICS
partment of Labor projects over 100%
increase in job openings for the decade
through 1985. Most of them new jobs
created by the expanding world of the
computer.
Learn at Home
in Your Spare Time
NRI can train you for this exciting, rewarding field. Train you at home
to service not only microcomputers, but
word processors and data terminals, too.
Training includes the new
microcomputer, 6- function LCD Beckman multimeter, and
the NRI Discovery Lab with hundreds of tests
and experiments.
TRS -80 Model III
Seems like every time you turn
around, somebody comes along with a
new computer for home or business
use. And what's made it all possible is the amazing microprocessor,
the tiny little chip that's a computer
in itself.
Using this new technology,
the industry is offering compact,
affordable computers that handle
things like payrolls, billing, inventory, and other jobs for businesses
of every size...perform household
functions including budgeting,
environmental systems control,
indexing recipes. And thousands
of hobbyists are already
owners, experimenting
and developing their
own programs.
Growing
Demand
for Computer
Technicians
This is only one
of the growth factors in-
fluencing the increasing
opportunities for qualified
computer technicians. The U.S. De-
Train you at your convenience, with
clearly written "bite- size" lessons that
you do evenings or weekends, without
going to classes or quitting your present
job.
Your training is built around the
latest model of the world's most popular
computer. It's the amazing TRS -80TM
Model III, with capabilities and features
to perform a host of personal and business functions. No other small computer
has so much
software available
for it, no other is
used and relied on by so. many people.
And it's yours to keep for personal or
business use.
You get plenty of practical experience. Using the NRI Discovery Lab® that
also comes as part of your course, you
build and study circuits ranging from
the simplest to the most advanced. You
analyze and troubleshoot using the professional Beckman LCD digital multimeter you keep to use later in your
work. Then you use the lab and meter to
actually access the interior of your computer...build special circuits and write
programs to control them. You "see"
your computer at work and demonstrate
its power.
Become the
Complete Computer Person
You're also trained in writing and
debugging both BASIC and advanced
machine language programs... gain
hands -on experience in the operation
and application of computers to business and personal jobs. You're trained
to become the fully rounded, new breed
of technician who can interface with
the operational, programming, and
service facets of today's computers.
You're ready to take your place in the
new electronic age.
Other Opportunities
NRI has been giving ambitious
people new electronic skills since 1914.
Today's offerings also include TV/
Audio/Video Systems servicing with
training on our exclusive computer programmable 25" diagonal color
TV... Communications Electronics for
servicing and installing microwave,
broadcast, CB, radar, etc... and other
state -of-the -art courses.
Free Catalog. .. Mail Card
No Salesman Will Call
Send the postage-paid card for
our 100-page catalog showing all
courses with equipment and complete
lesson plans. There's no obligation other
than to yourself. See how NRI can help
you grow with the most exciting and
important new field of the 80's. If card
has been removed, please write to us.
NRI
Ai
NRI SCHOOLS
C
3939 Wisconsin Ave.
Washington, DC 20016
I)
"
McGraw-Hill Continuing
Education Center
We'll give you tomorrow.
(TRS -80 is a trademark of the Radio Shack
division of Tandy Corp.)
APRIL 1982
37
OMPU1R
DifS
By Carl Warren
Training Tools and System Add-Ons
IF you're interested
in learning more
about digital electronics, you might
consider the E &L Instruments Inc.
LD -1 Pencil Box Logic Designer.
The Pencil Box sports such features as
2 pulsers, 8 LED readouts, 8 logic
switches, and an E &L SK-10 solderless
breadboarding socket.
Power to the unit is supplied via four
1.5 -V C cells or you can purchase an
optional ac adapter. The Pencil Box is
available as a kit for $86 as part number
325 -4301 or assembled for $114., part
325 -1301 from E &L Instruments, 61
First St., Derby, CT 06418.
The unit weighs lb, 6 oz and measures 10" x 7.5" x 2.5 ", making it small
enough to carry in a briefcase. The
onboard l -kHz clock is user variable
with an external capacitor and permits a
logic 1 at 3.25 V or a logic 0 output at
0.25 V, both at 10 mA.
The pulsers are fully debounced pushbuttons with logic true and complementary outputs with a logic 1 output current being 400 µA at 2.4V and a logic 0
current 16 mA at 0.4V.
The 8 LEDs serve as output ports or
monitors and are driven by two 4 -bit
latches with separate enables. These can
be used in concert with a microprocessor
to serve as bit indicators of addresses or
data depending on how you implement
the design.
The basic kit takes about 2 hours to
1
build and check out. Everything is
mounted on a single, well- marked circuit board, and all that is necessary is to
follow the instruction manual.
Further enhancing the Pencil Box are
a set of books-Technibooks I and II,
Logic and Memory Experiments Using
TTL Integrated Circuits by Dr. Peter R.
Rony. These books guide you through
basic digital designs and are chock full
of experiments.
The Pencil Box, coupled with the
books, make excellent items to add to
your bag of tricks if you're teaching a
basic digital design course. The nice
thing is that it won't cost you or your
students an arm and a leg to get going.
Moreover, the Pencil Box can serve as
an excellent design station for those
quickie designs you may be working on,
where you have to check out a circuit.
For that system you already have,
you might want to add a printer. A couple that you should consider, are from
C.Itoh Electronics, 5301 Beethoven St.,
Los Angeles, CA 90066.
Since dot -matrix printers provide a
great deal of capability, including near38
letter quality printing, take a look at the
Model 8500. This $775 printer is in C.
Itoh's Prowriter series and sports 80-column capability at 100 cps, single and
bidirectional printing, compressed- or
double -width character sizes and the
ability to do proportional spacing.
In addition you can have friction or
tractor feed at the flip of a switch. The
unit comes with parallel and serial interfaces that are dip- switch configurable.
We checked this printer out under
some fairly hard printing conditions and
found that it performed well. Furthermore, compared to similar printers, we
found that the 8500 was very quiet
mechanically.
The 8500 is also very easy to configure. We set it up for 1200 -baud serial
operation and the only difficulty we had
was understanding the manual. Although very complete, it is a little confusing since C. Itoh forgot to spell out
the exact location of the baud -rate
switches as opposed to the function
switches.
In configuring, you can set up the
desired protocol, DCI, DC2, ACK /NAK, the
busy and the default signals.
We especially liked being able to plug
the 8500 into the parallel printer port on
either the Atari 800 or TRS -80 Model
III and get it to work without special
drivers. We also were surprised at the
wide array of character sets available.
And the printer attaches directly to the
RS -232 output of a Microterm ACT lA
terminal and sends escape codes to get
any desired function including reverse
line feed, an italics -like print set, and
full- raster-style graphics.
Should you be using an Apple with a
serial or parallel interface, you can do a
screen dump to the printer by setting
graphics mode and control -Q in the
command mode. Whatever resides in
high memory will be dumped to the
printer.
And for that unique networking or
multiuser application, the 8500 can be
daisychained (up to four printers) with
each printer having its own unique
address. You don't have to have special
software to use this function, only be
sure to send the proper escape sequence
to toggle the desired printer. Although
we weren't able to daisy -chain a group
of printers, we were able to toggle the
select line of a single printer in both a
parallel or serial operation.
As capable as the 8500 is, you might
elect to have a fully- formed character
printer on your system. C. Itoh has also
introduced a new line of daisy wheels
Models F10- 40/55. The F10 -40 runs at
40 cps, handles 136 columns in pica
pitch, and 163 columns in elite; the F1055 runs at 55 cps and sports the same
column -handling capability.
Both daisy wheels have print spacing
of /12o-in. and a line feed spacing of
/4s -in. The F10 -40, which we had under
test, has a slower carriage return than
the F10 -55, taking 900 ms versus 500.
In addition, the F10 -40 will accept only
a single color cartridge and will handle
an original plus 2 copies, the F10 -55
handles an original plus 5 copies.
Other differences include: the F10-40
will operate at a maximum data rate of
2400 bps while the F10 -55 will operate
at 9600 bps. Both units use xoN /xoFF,
or ETX/ACK protocol, and can be configured, via dip switches or software control, to emulate virtually any other daisy
wheel printer available.
We found that with the F10 -40, we
were able to emulate an NEC Spinwriter and Diablo Model 630 merely by setting the dip switches. We also found that
the throughput equaled a Qume Sprint
III, and that, while using Wordstar in
the spooling mode, the printer was not
requiring a handshake all that frequently. The reason was that the model we
reviewed had the optional 2K buffer
rather than a 136-character one -line
buffer. This appears to make a world of
difference when in a spooling mode.
The unit we tested used a friction feed
which, surprisingly, clamped the paper
well enough so continuous forms could
be used. We printed well over 100 pages
without loosing registration which
speaks well of the mechanism. You can,
however, obtain a tractor feed or an
automatic BDT 160 single -sheet feed.
The manufacturer's suggested retail
prices for the F10 -40/55 range from
about $1300 to $1500.
1
1
(Continued on page 40)
C. Itoh Pro /Writer
Series 8500
Interested in computers or robotics ? Looking for info on
hardware, software, theory, and applications?
-
Thy CaRlpUtar Booti mUh offers you an incredible
range of computer books and a huge variety of tapes
and disks ... ALL at low, low member prices!
Select 6 fact -filled books
for only $2 95 value up
(total
801,1 AC
TIME - SAVING PROGRAM.;
=-
FOR THE TRS-80.
TEACHING 4OLIfi
Ct7TpT
74
il
to $111.70)
How
to Reptdr
Video Games
Mieropvoee //Or
Progromming
for OMPItor NNbyl''
ILLUSTRATED
DICTIONARY OF
MICROCOMPUTER
TERMINOLOGY
Digital
"'°""'
Interfacing
`"
HOw TO SOLVE
STATISTICAL PROBLEMS
WITH Yam_.
Witñ
An Analog World
NOW TO
DEVON
Px
FOR
ck`tta_r
iEtl{i{ib)aiú
ra
.earn Wrap pl!1!a.r PaFr,ws
24 TESTED,
YU
READY-TO-REIN GAME
PROGRAMS IN BASIC
ogre poMreES
nr
IRO
T CONTROL
RCONTROL
PASCAL
neaca,pa-"
J
l,tai.rsiv
NAM IN
STOCK&
MARKETS WITH MIR
PERSONAE COMPUfER
COMPUTER
MASTER HANDBOOK OF
MICROPROCESSOR
wikh
29
rencé.l-YO-nm
w m.cë
programs
,...,
bV LLYn
,
Scvtt Wersx*
Join now and get The "Compulator" Book
.
very good reasons to try
The Computer Book Club
7
Blue Ridge Summit, PA 17214
1
Reduced Member Prices. Save up to 75% on books sure to
increase your know-how
Satisfaction Guaranteed. All books returnable within 10
days without obligation
Club News Bulletins. All about current selections- mains,
alternates, extras -plus bonus offers. Comes 10 times a year
with dozens of up -to-the- minute titles you can pick from
"Automatic Order ". Do nothing, and the Main selection
will be shipped automatically! But
if you want an
Alternate-or no books at all -we'll follow the instructions
you give on the reply form provided with every News
Bulletin
Continuing Benefits. Get a Dividend Certificate with every
book purchased after fulfilling membership obligation, and
qualify for discounts on many other volumes
Extra Bonuses. Take advantage of added -value promotions, plus special discounts of software, games, and more
Exceptional Quality. All books are first -rate publisher's
editions, filled with up -to- the-minute info
...
æxr,>::aia,.cx;:«mes:x:::
M.
éfin\
MLR
,444a*
w.
... FREE! (List $7.95)
THE COMPUTER BOOK CLUB
1
Blue Ridge Summit, PA 17214
Please accept my membership in the Computer Book Club
and send the 6 volumes circled below, plus a free copy of
The "Compulator" Book. I understand the cost of the books
selected is $2.95 (plus shipping/handling). If not satisfied, I
may return the books within ten days without obligation and
have my membership cancelled. I agree to purchase 4 or
more books at reduced Club prices during the next 12
months, and may resign any time thereafter.
952 1028 1045 1055 1062 1070 1085 1088 1095 1101
1108 1111 1199 1200 1205 1241 1250 1251 1276
1277 1290 1293 1295 1299 1303 1330 1345 1369
Name
Phone
Address
City
State
Zip
- - - ---
¡Valid for new members only. Foreign and Canada add 20%. Orders outside I LS.
or Canada must he prepaid with international money orders in t!.S. dollars.
ILmmmmmmm MM-MM-
CIRCLE NO. 44 ON FREE INFORMATION CARD
APRIL 1982
T
HANI:)13t)()K_
PEcc-482
39
r.omputers
(Continued from page 38)
For That Total System Approach
to communications, there is Computer
Development Inc., 6700 SW 105th,
Beaverton, OR 97005, with the Micro corn system. The Microcom employs a
Zenith Z -89 as the basic building block,
but incorporates a built -in smart modem. This modem employs firmware protocol and error -checking control. Furthermore, it operates at either 300 or
1200 baud, and sports auto answer and
dial functionality. Coupled with the
Term software package, the user has the
ability to send Image- formatted documents, hook into remotes systems, stand
as a remote system, or serve in a Local
Area Network environment. This latter
function permits up to 2000 ft between
repeaters, can support up to 255 stations
and will operate at 56K baud on a single
coax line.
Currently, the Microcom is priced at
under $6000 for a 64K byte system,
with Digital Research's CP/M operating system, Image, and Term, modem,
and dual 5.25 -in. single-density floppy
disk drives. In addition, CDI is offering
5M -byte hard -disk add -on bringing the
price up to about $10,000.
CDI is presently unbundling the software and modem. Prices for the individual products are: Image wordprocessor,
$495; Forms, a specialized forms generator, for $295; the Term communication
package, $295. The modem should be
available soon for under $600 (single
unit). All the software packages, should
be available in most computer stores, or
through local distributors. You'll need
to contact CDI directly for specifics on
who has the products.
The Image wordprocessor permits the
use of graphics in the generated text.
Furthermore, the graphics can be
printed on a daisy -wheel printer. Currently, CDI offers drivers for the NEC
Spinwriter and will later provide drivers
for most daisy wheels.
If you're planning on getting the IBM
personal computer, you can expect
Image software for it by mid year, and
by NCC time in June, Zenith is
expected to introduce the Z -100 system
that uses the 8088, the MSDOS operating system (the same one used on the
IBM machine), and CP /M -86. In addition, the new machine is expected to give
you the option of color graphics as well
as full- featured monochrome. And CDI
is expected to offer Image software with
elements that support the new machines
unique display attributes.
Looking for
a
Tape-to -disk Driver?
Then drop a note to E. Mark Mears at
Cheerhart Cleaners, 122 Woodman Dr.,
Dayton, OH 45431. He has developed a
tape /disk system for the Meca Alpha -I
tape system and Meca disk drives using
MDOS. This driver integrates the disk
drives into the Alpha Microsoft extended BASIC, thus giving you the best
of both worlds.
The table printed here is a list of the
commands used, and apparently Mr.
Mears is offering the software free to
any user of the Meca Alpha -I system.
40
Controller Update. This past December, we reviewed the double- density
controller from Magnolia Microsystems. We incorrectly told you that you
couldn't change the density of the drives
under software control. We were only
partly correct.
You can't change the density of the
5.25 -in. standard Heath drives, but you
can change the 8 -in. from single to double or vice versa. You do this by using
A
the
SET command. A typical command
would look like: SET D.DD. On entering.
the CRT will respond that the drive is
now set for double density. Unfortunately, however, the controller won't sense
the density of the diskette on insertion;
you must supply this information. We
think this is a slight shortcoming based
on the reliability of the controller. Ours
has been in use for over 8- months with
no failures.
MECA ALPHA -I COMMAND TABLE
AND TAPE COMMANDS
IIISt' (t)
TO *LOAD NNNNNt
*LOAIt NNNNt AAAA
OR *LOAD NNNNt
Y.
AAAA
*LOAD NNW :X AAAA
NOT *LOAD NNNN AAAAA (TAPE).
SHOULD NOT LOAD ASSY FROG THAT WILL OVERLAY(BASIC
AREA) BUT THEY CAN BE FORCE -LOADED IN HIGH MEMORY.
BASIC --
/MAOS
* LOAID NNt
NOT CLOAD "NNW AAAA
CLOAD " NNNNt TO CLOAD "NNUMMt.
CLOAD "NNNN :X OR CLOAIL _!Nt1NNt :X (TAPE OR DISK)
FNAME MUST HAVE 4/5 CHARACTERS.
CLOAII "NNNNN :X +
CLOAD " NNNNNt +
TAPE FROG ADDED TO ENIt OF CURR PROGRAM.
DISK PROG ADDED TO END OF CURR PROGRAM.
FOR DISK: DRIVE CONTROL CAN BE 'REM* DIRE :DX
IN PROGRAM
CHAINING PROGRAMS IS THE SAME.
PRIOR TO MERGING PROGRAMS.
'
IS RECOMENDED OVER CLOAD " *R NNNNNt
CLOAD " *R NNNNNt :X
CSAVE " *R NNNNNt :X WILL PROMPT AND WAIT FOR CR
FOR ARRAY FILES: THE VARIABLE MUST HAVE BEEN 'DIM'EII
PRIOR TO ARRAY CLOAD.
FUR CSAVE'S AND CSAVE ARRAY'S TO DISK.
THE DISK WILL
BE MOUNTED (IF NOT CURRENT DR) AND OPERATOR PROMPT WILL
WAIT FOR CR.
IF ANY KEI ENTERED: FILING IS SKIPED.
THIS K/B INPUT(STOPF'ING) CAN BE SKIP ED BY THE: AF1C
CHANGE LISTED BELOW.
PROMPT
=
NNNNN AAAA BBBB
OK F = CR
ANY INPUT BUT CR WILL ABORT FILING
OR *DIRE :1
ARE THE SAME(TAPE).
*DIRE :0
WILL READ CURRENT DIR IN OS.
*DIRE :D
WILL FORCE DISC( READ OF THAT DIR.
*DIRE :D1
REM* DIRE :DI
- IS VJALIII BASIC COMMAND.
c
AND DIRECTORY
LRE :[iI: (:AN
OVER -RIDE OPTION,
THE NATURE OF THE ERROR WILL CONTROL
BE OVERIDEN.
THE SUCESS OF THIS.
:
AF1C
B68C
48D7
4517
BEFC
APEO
B001
3B39
3971
'
30
NORMAL
44828 - 35 NO DISK SAVE OPTION
46732 - 195 NO DISK DIR UPDATE
205 NORMAL
200 NORMAL
- 18647 - 201 NO TAPE DIR UPDATE
102 NORMAL
NO WIN IN TAPE DIR
- 17687 - 51
191 NORMAL
- 48892 - 122 NO WIN IN DISK DIR
- 44000 - HOLDS LAST OS ERROR CODE
- 45057 - HOLDS t OF FILES IN DISK DIR
- 151:1 - HOLDS 4 OF FILES IN TAPE DIE: #0
- 14705 - HOLDS 4 OF FILES IN TAPE DIE: #1
-
POPULAR ELECTRONICS
test equipment
Popular Electronics Tests
Sa:iiva LCD- ')OO
Multifester
at an input resistance of 50,000 ohms/
volt. The ac voltage is selected from 10,
30, 100, 300, and 1000 volts, ± 4% full
scale and at 10,000 ohms /volt. The dc
current ranges include 0.3, 3, 30, and
300 mA, ± 3% full scale, while the ac
current range is limited to one range of 3
amperes ±6% full scale. Three resistance ranges cover 1, 10, 100, and 1000
kilohms within ± 3% of arc.
Four rubber bumpers on the underside keep the instrument from slipping
off the work surface. The carrying handle /tilt stand is also provided with a
skidproof rubber fitting.
THE Sanwa LCD -900 Multitester is
an analog multimeter with a difference, and as they say, "Vive la difference!" Although this instrument is an
analog device, using a circuit that has
proven itself over many years, its "meter" is a unique LCD display. Each of its
scales -one for each position of the
displayed
function /range switch
only when required, with each independent scale provided with its own numerical display and function identifier.
Unused scales do not appear, so there is
no confusion as to which scale is in use
at any moment. This action is similar to
what happens to the face of a digital
watch as the function button is operated
to change the readout.
The analog meter movement has a
sensitivity of 17.5 µA full scale, having a
deflection angle of 98 °, and it features
spring -back jewel bearings and diode
overvoltage protection. When the function /range switch is in the OFF position,
the meter movement is shorted, thus
21
-is
highly damped. This makes it safe to
carry the meter around without pegging
the needle and possibly bending it.
The high- impact plastic case is 41/2"
W X 6" H X 21/4" D, and it weighs 28
oz. Two 1.5 -volt cells are used for making resistance measurements, and a single 9 -volt battery drives the LCD readout. When operated between -10 and
50 °C, LCD lifetime is estimated at
50,000 hours. An optional carrying case
is available. The suggested list price is
$162.50.
-
General Description. The LCD -900
is provided with four input connectors
COM(-), +, OUTPUT, and
AC3A
(am-
peres); and three manual controls-0g
ADJ, power ON /OFF (which also doubles
as a polarity inverter), and a 21- position
function /range switch having colorcoded ranges. The OUTPUT terminal is
used to measure ac voltages riding on a
dc level. The carrying handle doubles as
a tilt stand.
Dc voltage ranges are 1, 3, 10, 30,
100, 300, and 1000 volts, ± 3% full scale
APRIL 1982
Comments. The Model LCD -900 was
checked by the Lockheed Electronics
Instrumentation Measurement Labs
(Plainfield, NJ) against standards
traceable to the National Bureau of
Standards. After the tests, the IML
issued a certificate attesting that the
LCD -900 met or exceeded its published
specification in all respects.
The LCD -900 was put to work on the
bench, and immediately made a lot of
friends, mostly due to the unique "meter" display. For the first time, we were
able to use an analog meter without having to worry about which scale we had to
look at. Interestingly enough, since only
one scale at a time appears on the display, we found that we could make more
accurate numerical readings since there
were no extraneous scale distractions. If
you use analog instruments (and there
are some benefits, such as reading a jittery voltage), take a look at the LCD 900. You will like this novel approach to
an old reliable measuring instrument.
-Les Solomon
CIRCLE NO. 104 ON FREE INFORMATION CARD
41
Popular Electronics
APRIL 1982
/\DD
WAVEFORM STORAGE
TO YOUR OSCILLOSCOPE
Converts any scope with external trigger input
into a digital storage unit
BY JONATHAN WANG AND DENNIS MURPHY
HAVE you ever wished you owned a
storage oscilloscope to see those
transient waveforms and random events
that escape you? Now you can savor
these signals without spending thou sa ids of dollars. Moreover, you can
enjoy the advantages of digital storage
as compared to analog (CRT) storage,
all for about S228.
Called the "Wavesaver," this black
box can convert virtually any conventional oscilloscope that has an external
trigger input into a digital storage scope.
Its 1K x 8 memory stores random or
repetitive analog waveforms with a 'vertical resolution of 256 discrete steps
(8 bits) sampling to a 500 -kHz rate. It
features pretriggering to capture signals
before the trigger occurs, as well as post trigger viewing. In conjunction with an
ordinary oscilloscope, you can view signals as they occur or save them for later
examination. Furthermore, the Wavesa ver can save waveforms to obtain hard
copy when used in its plot mode since
interfacing is built in for use with a
chart recorder.
42
How It Works. The Wavesaver combines A/D (analog -to- digital) and D/A
with
converters
(digital -to- analog;
RAM (random access memory) to significantly enhance a conventional single -trace oscilloscope. It also has digital
storage features that provide "sampling" and "quantizing." Sampling involves obtaining voltage levels representing an analog input signal at discrete points in time and quantizing is the
transformation of these values into binary numbers by an A/D converter. You
determine how often this process occurs
by using a very precise digital clock.
Once the data is in the digital memory,
it can be read out at a fixed rate and
reconstructed for displaying. (See box.)
In the Wavesaver, sampling and
quantizing are performed so that every
voltage sample derived from a series of
very narrow contiguous time slots is converted to a binary number using an A/D
converter. The binary data is then stored
in a 1024 by 8 -bit RAM with each time slot's value stored as one 8 -bit byte. The
process continues until all 1024 bytes in
the RAM are filled. The digital data can
then be read out of the memory and
passed through a D/A converter, which
reconstructs the original analog waveform for application to the conventional
single -trace oscilloscope. Since the
RAM can be nondestructively read out
indefinitely, the reconstructed display
will remain on the CRT screen as long
as the user desires.
Besides the previously mentioned
A /D, D /A, and RAM features, the
Wavesaver, shown i-i block diagram
form in Fig. 1, also las provisions for
driving an external plotter or other digital system.
Three operating controls -TIME PER
POINT, ± VOLTS, and TRIG LEVEL -can
be compared to the scope sweep speed,
vertical gain, and sweep trigger controls
respectively. Signals can be sampled up
to 500 kHz (2 µs) producing 256 data
points, enough to make a very smooth
waveform. This sampling can be selected in -2 -5 steps from 2 gs to 100 ms, via
the crystal -controlled internal clock or
an external clock. Input sensitivity is
1
POPULAR ELECTRONICS
Improve Your Memory
With a Free
Scotch® Brand
Data Cartridge.
Buy One,
Get One Free!
We want you to try our Scotch Brand DC100A
Certified Data Cartridge. We're so sure you'll
like it that we'll send you a free cne when you
order one data cartridge at the regular price of
just $18.00. No strings attached. Two of these
superior data cartridges for the price of one.
Scotch Brand
Data Cartridges
are compatible
with all
HewlettPackard
mini cartridge
computers, including the popular HP-85 model.
They also fit the Savin Veritexr 950 word
processor, the TI -770 terminal, Tektronix
models 4041 and DAS -9100 and many others.
We invented the certified data cartridge and
our special back treatment process makes our
tape extra durable and longer lasting. Enlarged
end -of -tape sensor holes are provided for
improved end -sensing reliability. Scotch Data
Cartridges are quiet, too, and come with a one
year warranty.
Order Now! Get a Free
Protective Case.
Order now and we'll send you a rugged, heavy duty protective shipping and storage case
that holds two data cartridges. But don't wait,
quantities are limited. (Offer limited to one free
data cartridge per
customer.) HOW TO
ORDER: Send check
or money order for
$18.00 (plus
applicable state
sales tax) or
charge to
your
Master
Card or
VISA account.
RII out the coupon
and send to the
address shown. Please
allow 6 -8 weeks for delivery
Offer expires September 30, 1982.
rHIP
Name
1
1
Title
Company
1
Address
City
State
Phone
Zip
1
Computer Type
Signature
1
($18 plus state sales tax).
Total enclosed $
Make check or money order payable to 3M.
Visa or
Master Card.
Charge to
Card No.
Expires
1
1
SEND TO: 3M, Dept. CC -S4 DATA RECORDING PRODUCTS DIVISION /3M,
PO. Box 33133, St. Paul, MN 55133.
,
3M hears you ...
3M
wavesaver
1. Block diagram of the
Wavesaver system from the
input signal to the
Fig.
TO
INPUT
AD
SIGNAI
CONVERTER
DA
SCOPE
CONVERTER
lFg 4.
VERTICAL
INPUT
RAM
-
'
..
.Fp
scope's vertical input.
VARIABLE
CLOCK
'Fg
r
81
+15V
+5V
C17
33PF
+ISV
_I-
DIE
T1
C4
JI
V22N39
INPUT
DC
C(//
OL
.33µf
y
+5V
é
39K
I
R22
IK
TO
FIG 5
"RRAN
OK
TRIG
9
LEVEL
OIyF
OFF
RÓR
SI
AC
R51
DII-017: IN4148
C5
IM
SpI
VI
T
V
C15
OIVF
R47
DIT
1008
10
01
R48
10.7K
VOLTS)
V2 2N3958
+05
.05
11
Fig 2 The input to the
Wevesaver is epplied first
to a dual field- effect
transistor which provides
buffering and a high input
impedance. The desired range
is chosen by switch S9.
:-
DI4
25
59A
6
C3
10
D15
47pF
.5
012
SOR 3 R56
10.7
AL
0D
'
RS7
2.67
I.OIyF
4
D13
.5
-
I
#
R58
R59
563
K8
K
R60
218
FIG3
VOL T51
C16
2VOLTS
R4
I
LF357
SJ7 -15V
I
V
R105
I
I
011
-.-
953
9
0.7K
R3
IOK
R49
CAL
7sn
\
Q598
-ISV
0
4B711
+
339F
LDZY
5V
7,5V
Cal
01VF
998voi
TOF,4
A
T
ROM
715
-2
C52
33VF
C32
OIVF
Fig. 3. The analog /digital
converter is an 8-bit
cze
(
successive -approximation circuit
formed by IC35 and IC36.
VF
1.
V
5V
C6
47npF
R39
4.99K
I/ C30
IyF
IC 56
R40
4.99.
1
DAC
09
58
SB
3
SC5
4
13
1
14
3
TO
FIG
(
I
8
LSB
I
I
4
I
l
I
13
l
12
II
6
5
4
3
R36
-comp 5TÀRi:CLK
D
TIME
BASE
FROM
FIG 7
7
.`ÑF
44
+5V'
3 617
from 50 mV to 10 volts at one -megohm
input impedance and is overload protected. The analog output is 8 volts full
scale, trigger output (for external devices) is at TTL level, and the digital
output for the external digital system is
8 -bit parallel, TTL, word serial.
The Wavesaver has three different
triggering modes. The first uses the setting of the front -panel TRIG LEVEL control to preset an input level and polarity
POPULAR ELECTRONICS
so that, when the viewed signal exceeds
ac /dc input selector switch SI to dual
FET QI that provides input buffering
and a high input impedance (1 megohm). Potentiometer R4 determines the
zero offset, while diodes D16 and D17
protect the input stage against excessive
can also be passed to a plotter that can
generate permanent records for later
study.
these parameters, the system starts storing data. In this mode the system can
monitor ( "babysit ") a signal line, allowing you to leave the equipment and go
about other business. If the event occurs
during your absence, it will be recorded.
At your convenience you can "see" what
went on before the event, the event
itself, and a short period after the event.
This is great for observing "glitches."
The second trigger mode, AUTO, updates the stored data every two seconds.
The stored image can be "frozen" on
screen as long as the user desires. In the
third trigger mode, the system is operated manually via a front -panel pushbutton. The data remains on screen until
the manual pushbutton is depressed.
This is ideal for detailed study of a
waveform of interest.
The digital storage technique used in
the Wavesaver allows direct connection
to a computer for further signal processing, or storage on a diskette. The data
Circuit Description. As shown
in Fig.
2, the signal to be observed is applied via
IC4,IC5,FIG.6
FROM
R6
RI
3.6K
iK
Vnwi.-=
LS8
MSB
+15-
R9
4.99K
9.98V
5
7
0
9
8
12
R5
FROM
FIG 3
I33
C38
20K
Mn^
08(81
DAC
J2
V-eINORMAL
OUTPUT
RR
.OI5F
4.991(
Lr,l
I13
1022F
p
V
-15V
+15V
/}C36
T1 .IpF
G3s.IpF
CI
470pF
5V
C33
J3
OIyF LINEAR
3
OUTPUT
R43
13Ñ
Fig. 4. The digitized signal
is converted back to analog
form by IC3.
SCOPE
3
47K
C2
160pF
-15V
C34
.015
F
+5V
S2
PLOT
IOpS
FROM
FIG 3
+5V
mS
Ca
7
.015F
FI2 G
M
+5V
O
+5V
DB
PI
RIG
FIG® TTRIG
9
Fig. 5. The control logic
is shown here and in
Fig. 6 on the next page.
The combination of IC18
and IC 19 supplies the
RII
IOK
54
actual start and stop
signals of the recording mode.
TO
FIG
POST -TRIG
PRE-TRIG
1/2
IC19
7474
R12
101(
6
0
D7
164149
PI
FIG®
+5V
EXT ARM
C8
ARM
S7
.t.
r
47
+5V
R23
4.71(
10K
5
R24
5111
2
3
+5V
tR27
10K
C45
.015F
i
R28
IOK
+5V
MAN.
1726
AUTO.
74221
5V
33pF
10K
ARM
S5
IC22
C49
R25
IOK
+ 5V
14
V2
IC15
T.+C25
3356
1C22 5
74125
C41
ZyF
4
+5V
APRIL 1982
45
wavesaver
L$B
14
8
Cs
IC4
WE
+5V
+ 5V
(:)2
18
1
7
C
3
16
2114L
i
4
5
-- +5V
15
3
16
TO
17
2
SC13,FIG
3
IC3,FIG4
18
8I
ICII
CS
74L5157
IC5
WE
2114L
7
A4A5A6A7
A7
AO Al A2 A3
7
6
4
5
15
3
16
o'
1
2
MSB
II
56 A?
17
V
14
5V
TO
C7
R13
OK
470pF
8
FIG 3
FROM
FIG 5
6
I/2
IC15
74221
16
9
2
1
8
16
9.
2
I
8
16
9
(CLN)
12
(CLEAR)
8
I
437'50
IyF
1 T42
1
IµF
33y F
+5V
supplies the "sync" signal for the oscilloscope.
Selection of the Wavesaver's display
or record mode is determined by the
state of IC11 (Fig. 6). An element within IC17 (Fig. 5) selects either the
SCOPE or PLOT mode via S2, while
another element within ICI7 operates in
conjunction with TRIGGER switch S3 to
determine whether INT or EXT triggering
was selected. The combination of IC18
and IC19 supplies the actual start and
stop signals of the recording mode. A
dual- decade counter (IC16) provides the
auto-arm function and disables the
manual -arm feature (Fig. 5).
The crystal -controlled clock oscillator
is formed by elements of IC28 and its
5 -MHz output is used to clock the A/D
converter (Fig. 7). It also drives a chain
of eight decade counters (IC23 through
IC26, and IC29 through IC32) arranged
in a -2 -5 sequence to produce time
pulses from 2 µs to 100 ms. Multiplexers
IC27 and IC33 of Fig. 8 accept these
timing signals while the 16- position
TIME PER POINT Switch (SIO) determines
the sampling rate.
To display the stored waveform on a
1
J4
TRIG
OUTPUT
Fig. 6. Random- access memory is
contained in IC4 and IC5,
with IC8, IC9, and IC 10 serving
+SV
C58
as address counters.
signal levels. The network consisting of
R48 and a resistance selected by the
± VOLTS switch (S9) provides the desired signal input range. Diodes D14 and
D15 protect the IC38 input against
damage from high -level signals. The signal is amplified in IC38 to provide the
A/D converter (Fig. 3) with the correct
levels, while diodes DII through DI3
act as level clamps to protect the A/D
converter. The output of IC38 also
drives half of IC37, to provide the trigger signal for the control logic (Fig. 5).
The A/D converter of Fig. 3 is
an 8 -bit successive-approximation type
formed by successive- approximation
register IC35, current -sensing A/D converter IC36, and half of IC37. It takes
nine clock cycles for each conversion,
with IC21 and IC20 acting as a start/
stop enabling circuit. On completion of
each conversion, the data at the output
of IC35 and latched into IC13 on the rising edge of the signal and then passed to
the memory (IC4, IC5, Fig. 6) on the
trailing edge of the waveform. Integrated circuit ICI and its associated
components develop the reference current required by both D/A converters
(IC36 and IC3). In Fig. 6, IC8, IC9 and
IC/0 serve as the address counters for
RAMs IC4 and IC5, and are "clocked"
by IC11. Pin 12 of ICIO generates a
"memory full" signal for the system,
and after inversion by a portion of IC21,
46
`
5"
74LS90
D
6'
13
,iI
r200118
IC26
I
500yS
101
C59
+5V
.IVF
+5V
IHiI
St
oy5
Im5
IC32
74L590
14
2OAS
E
12
2m5
TC
TO
} FIG
FIG
e
/(
e
50+5
5m5
I00µS
IOmS
+ 5V
5mHz
OUT TO
FIG 3
xTAL
R31
SHZ
soon
C54,IDmI
.OIyF
C55
OIy F
C9
47pF
7. The crystal -controlled
clock circuit and time
pulse generators.
Fig.
POPULAR ELECTRONICS
scope, requires that the digitized signal
INSIGHTS TO DIGITAL STORAGE
There are two digitizing techniques that
you shouldn't confuse: real-time sampling
and equivalent -time sampling. Digital storage scopes use real -time sampling so that
they can capture both repetitive and single shot signals. Sampling scopes use equivalent -time sampling and are limited to capturing repetitive signals. Equivalent time
sampling- random or sequential -builds
up a picture of the input waveform by capturing a little bit of information during each
signal repetition. Eventually enough information is available to reconstruct the entire
waveform. Among the drawbacks of analog -type storage is fading or blooming of
the recorded waveform, which does not
exist with digital storage.
Accuracy vs. Resolution. The digital
storage scope's A/D converter must be
able to "resolve" (discriminate between)
different input signal levels. Here, resolution is determined by the number of "bits"
Accuracy, on the other hand, means that
apply exactly 150 volts to the instrument, it should display 150 and nothing
else. If you do apply exactly 150 volts, and
the display indicates 147, the accuracy of
the instrument is 2% (3 divided by 150) at
150 volts. Accuracy cannot be better than
the resolution.
if you
A Unique Error. Pushing a digital storage
scope past its upper frequency limit results
in an error different from that encountered
with an analog scope used under similar
conditions. The error is called aliasing, as
illustrated in (B) and there is only one way
to avoid it: always digitize more than twice
as fast as the highest frequency in the analog input signal. If a suitable digitizing rate
is not available, you can use an anti- aliasing filter to eliminate frequencies above the
Nyquist limit. That avoids aliasing, but it
also removes any indication that higher -frequencies are present in your input signal.
ORIGINAL SIGNAL
ANALOG
VOLTAGE
10
8.75
7.5
6.25
A/O
OUTPUT
5
3.75
2.5
1.25
ALIASES SIGNAL
O
A/D converter, the analog input
is sampled at the midpoint of each
quantization level, the distance between
levels being denoted by O, the bit size.
Fig. A. In an
(binary digits) that will be used to approximate the analog input signal. For example,
a 2 -bit number that forms all combinations
of
and 0 produces 11, 10, 01, and 00. If
the analog input range to be measured is
10 volts, as shown in (A), the four possible
sub ranges must be 0 -21/2, 21/2 -5, 5 -71/2,
and 71/2 -10 volts (each bit will switch half
way up its input level -not very smooth).
Thus, the more bits, the better the resolution. In the Wavesaver's 8 -bit converter
there are 256 levels with each level representing 0.3906% of the input voltage, or
3906 parts per million.
Accuracy and resolution are not the
same thing. Resolution is the distinguishing
of individual elements, while accuracy is
another term for repeatability- conformity
to an indicated value with repeated measurements. For example, assume your
DMM has just 3 digits (21/2 digits if you're
fussy). If you apply any level from 149112 1501/2 volts dc to it and the display always
indicates 150 V, the resolution of this particular DMM is volt. It cannot distinguish
between smaller voltage differentials.
1
1
APRIL 1982
Fig. B. If a signal is digitized less
often than necessary, aliasing results.
Here a 120-Hz signal digitized at 160 Hz;
gives an aliased waveform at 40 Hz.
Anti -aliasing filters have at least 12 -dB/
octave rolloff, while bandwidth -limiting filters are 6 dB / octave.
Once you know the maximum digitizing
rate of a digital storage scope, you can
determine if the instrument will meet your
needs by applying sampling theory. Application of the theory shows that any signal
with a frequency denoted by f must be digitized more than 2f times to be fully recovered (exactly two times won't do).
Another way of stating the same rule
uses the Nyquist frequency (half the digitizing frequency). No frequency at or above it
can be recovered without error.
Remember, a digital storage scope is
not the same as a sampling scope. A digital storage scope captures the entire signal-be nt repetitive or single occurrence-in one shot, while a sampling
scope requires many "shots" at a repetitive signal before it can build up a usable
image. Thus, a sampling scope cannot be
used to observe non -repetitive random
events, but it is not constrained by aliasing
when examining high- frequency inputs. 0
into analog form.
This is the purpose of IC3 in Fig. 4. This
chip accepts an 8 -bit digital data stream
from the RAM and, using a fixed reference voltage, generates the analog
equivalent at its output. (Since the D/A
converter is a "current" device, IC34 is
used as a current -to- voltage converter.)
A simple active filter (IC2) smooths the
reconstructed waveform. The digitized
signal, as well as certain "handshake"
signals, are also available from connector PI (Fig. 9). The digitized signal is
buffered by IC6 and IC7, with the handshake signals available for flexibility
when direct interfacing with external
digital devices is involved. The power
supply is shown in Fig. 10.
be converted back
Construction. It
is recommended that
the Wavesaver be constructed using the
dual -sided pc board shown in Figs. 11
and 12. Component installation is shown
in Fig. 13, and external elements are
connected as shown in Fig. 14.
To avoid possible static damage,
mount QI only after its associated components are installed. Rectifier diodes
D3 through D6 are mounted on the
underside of the board so that transformer TI can be properly installed. The
dot on TI specified in the Parts List
indicates pin 1, and sockets should be
used for all semiconductors. After completion, the board can be mounted within a selected metal enclosure.
Other than S9 (the ± VOLTS rotary
switch mounted on the pc board to protrude through the front panel), switches
S3 through S7 along with LEDI (TRIG),
LED2 (POWER), and INPUT Connector JI
are mounted on the front panel of the
selected enclosure. Each front -panel element should be identified with press -on
type.
The three BNC output connectors
J2 (NORM), J3 (LIN), and J4 (TRIG),
along with S2 (SCOPE /PLOT), fuse FI,
and the power line cord should be on the
rear panel of the enclosure. The I 5-pin
external connector P1 should be
mounted on the pc board to protrude
through a slot cut in the rear panel.
-
Calibration. A high -input- resistance
dc voltmeter (preferably a 31/2 -digit
DMM), an oscilloscope, and an audio
signal generator should be used to calibrate the Wavesaver. When power is
applied, the POWER indicator (LED2)
should glow. Check that 5 -, 15 -, and
-15 -volt supplies are delivering the cor-
rect voltages.
To set the reference level, connect the
dc voltmeter between test point A (Fig.
13) and ground. Adjust R2 for 9.92 volts
(given as 9.98 on the schematics to corn47
wa vesa ver
7 -7/8"
Fig. 11. Reduced pattern for foil side of the double -sided pc board. Note correct size.
4. Use either the ARM pushbutton
switch (S7) or pin 13 of the rear panel
PI. LEDI above the TRIG LEVEL control
should glow if arming is successful.
5. After arming, the data recording
process will begin instantly and can be
stopped only by triggering the system.
6. If INT trigger was selected, after the
correct signal level (determined by the
TRIG LEVEL control) is detected, the system will trigger automatically. If EXT
trigger was selected, the system has to
be triggered either manually with the
TRIG pushbutton (S6), or via pin 15 of
PI. After detecting the trigger, the data
recording will stop immediately.
50
If the ARM toggle switch is in the
position, the system will be automatically armed after two seconds of
display time elapses. If it is desired to
"hold" a waveform, flip the ARM toggle
switch to the MAN position before the
two-second interval has elapsed.
8. During pre- trigger recording, if the
trigger occurs before the entire sweep of
the memory has elapsed, the display
might include a portion of the previously
recorded waveform if not erased. To
erase the memory, place the TRIGGER
toggle switch in the EXT position before
arming and after the time interval determined by 1024 times the setting of the
7.
AUTO
switch. After erasing,
place the TRIGGER switch back to the
desired position.
Post - Trigger Mode:
1. Select the desired TIME PER POINT,
± VOLTS, TRIG LEVEL (if INT trigger is
selected), INPUT coupling, and either
MAN or AUTO arm (as required).
2. If MAN arm is selected, use either
the front-panel ARM pushbutton or pin
13 of Pl.
3. After detecting the trigger, the
recording will begin, and after the RAM
has accepted one full sweep, the system
will go to the display mode. Until a new
ARM signal is applied, the data just
TIME PER POINT
POPULAR ELECTRONICS
7 -7/8"
Fig.
12.
Reduced foil pattern for component side of pc board. Note correct size.
stored in the RAM will be continuously
displayed.
4. In the AUTO arm mode, the system
arms itself after displaying the data
stored in the RAM for two seconds.
After two seconds, any new trigger will
automatically initiate updating the
RAM with new data.
5. To retain a waveform when operating in the AUTO mode, place the ARM
toggle switch in the MAN position.
Waveform Voltage Level:
1. Although the ± VOLTS switch can
be set as desired, the analog output level
of the Wavesaver is always 8 volts for a
full -scale display.
APRIL 1982
2. If the recorded waveform measures
two graticule divisions, the scope vertical sensitivity is set at 2 V /division, and
the ± VOLTS switch is set at 0.5 volt, the
recorded signal has an amplitude of 0.5
volt.
Plotter Use:
1. When SCOPE/PLOT switch S2 is
placed in the PLOT position, this enables
connector Pl.
2. On PI, pins through 8 are digital
data with pin the most significant bit
and pin 8 the least significant bit. Pin 9
is ground, pin 10 is sync (or data valid),
pin 11 is the input for an external clock,
and pin 12 is a 50-Hz pulse that can be
1
1
used as the "write" pulse to an external
computer. If the Wavesaver's internal
clock is used, pin 11 and pin 12 must be
shorted together. Pins 13 through 15 are
external inputs for remote arming, triggering, and then clocking data into
memory. All signals to PI must be TTL,
and pins
through 8 can drive three
74LS (low -power Schottky) loads.
1
Applications. Uses for a storage oscilloscope are many. The test instrument
presented here, for example, enables the
user to see events before triggering. This
is useful in solving a variety of problems
before they would normally occur, such
51
wavesaver
--RS-R6--
R43
R7
RI
'Iv
?C21
-CI-
,
+
1
CIO
IC39
PI
3
I
TI
C2
-02-
C34
C61
,III
030405D6
C36
IC4
1
(
I
I
I
I
\ C41
IC3
IC6
IC5
IC7
C12
+1
(
<
IC14
I
C50<
C43
IC9
IC8
ICI
,C45
,C47
-C37-
R36
"1:7-
-R12-I
IC20
ïI
C53C
1
I
IC18
I R
JAI I26
IC22
CIB<
IC19
RI
-R55-
RI2
I
I
D-1R39
C26.<
K
-R41-
IC 36
I
>C17
RI2
RIO-C28-
IC24
1025
D
58
K II
D K1'`^^`
IIN)'15<
R3
IC38
013
C54<
KTAL\
['1
-645-
I
i
CI6
-R46-
31
I
C554
C
-"=IC23
,
R52
1c 37
C27
t-'
-C40-
I
^
1
cz
RI
R21
620
I
C 018
C131
38
I11
1
ICI
`
IC35
CB
R D7R25
V
C32
19
C7
C
C52
R
I
IC15
R37
IC21
R14
R13
051
R2
R044
C48
030
C
I
Io I
7C23
1013
C'
1
C42
C
IC28
1
-R32-R33-R34-
C19
Q
IC33
013
CA
R-RSI-
SIO
-R35-
\
-016Z
-CS-
K
-C347
I
R
48
-D15- K
O
-R491
01
Rq
K
I
DI7-
44
I
^
C14
1`
C20
Fig. 13. Component layout for the pc board.
Fig. 14. Connections
PRE -TRIG
S4
!OST TRIG
SCOPE
S2
PLOT
ExT
53
TINT
-J-
S6
TRIG
MAN
-,1
55
AuTO
=
S7
ARM
=
TRISTRIG
R63
3308
LE02
POWER
52
ro
Si
to external components
from the pc board.
as witnessing a glitch that blows a fuse.
With post- trigger only, it would be too
late. You can record events while you're
out having a cup of coffee, since the
instrument has an automatic mode. In
the manual mode, you can catch those
fleeting one -shots. And the digital output interface enables you to plug in the
stored information to a computer for
analysis.
Here's a sampling of applications:
switch- bounce testing, microphone performance, speech synthesis, loudspeaker
analysis, television servicing, audio system testing, automotive engine performance, logic- circuit testing, capacitor
characteristics, and so on. Clearly, the
Wavesaver can open up new horizons on
your test bench.
POPULAR ELECTRONICS
Complete Satellite Receiver
System brings you movies,
concerts, sports events.*
The first fully programmable
keyer stores commands as well
as text.
The Heathkit Earth Station includes a
heavy -duty, 3 -meter antenna, an integrated low -noise amplifier /downconverter, and a receiver with electroni-
You HAM's will love the
cally- synthesized tuning for stable,
drift -free reception. 24 channels let you
receive just about everything the satellites have to offer. Special Earth
Foundation Kit anchors your antenna
firmly to withstand winds of up to
100 mph. And it's all yours at a very
affordable price.
Heathkit.tMatic
Memory Keyer with custom microprocessor to store up to 240 characters of
text or commands. Variable- length
buffers eliminate wasted memory space.
Command strings take several text buffers and string them together in any
sequence for most efficient use of mem-
:.._...
ory. Command strings can also select
speed, weight, spacing and auto -repeat
count. Integral capacitive touch paddles
unplug and store in their own compartment. Put the fun back in CW.
^ Iat=.1
Complete computer system
in one compact unit.
Solar Water Heater saves you
up to 80% on hot water costs.
The Heathkit All -In -One Computer takes
the guesswork out of selecting a bal-
As fuel costs rise, the Heathkit
anced computer system. It includes
built -in floppy disk drive, smart video
terminal, heavy -duty keyboard, 12 -key
numeric pad, two Z80 CPU's, and 48K
44"1
Solar Water Heater keeps
paying you back. Because
you build it yourself, you
build it better, for less. And with
Federal and State tax credits, solar pays
for itself in no time. Based on computerized data, we help you select the correct system size to produce 50 to 80 percent of the annual BTU requirement for
water heating, based on available sunlight in your area. So you know it's
practical before you buy. The system
RAM -all in one compact unit. Save
30% over comparable assembled units.
Heath makes it easy to build with
detailed, step -by -step assembly
manuals that anyone can follow.
A complete line of software for home,
work and play is also available.
includes solar panels, pumps, heat
exchanger, storage tank, and complete
assembly and installation instructions.
Free Catalog
See all the newest innovations in build -it- yourself
kits in the new, free Heathkit Catalog.
Heathkit
Send to: Heath Co., Dept. 010 -882
Benton Harbor, MI 49022.
If coupon is missing, write Heath Co.
Dept. 010-882 . Benton Harbor, MI 49022
In Canada, write Heath Co.
1480 Dundas Highway East,
Mississauga, Ontario L4X 2R7.
Yes. Send me a Heathkit Catalog.
I
Name
Heathkit Products are displayed, sold and serviced at Heathkit Electronic
Centers+ in major cities in the U.S. and Canada. See your telephone white
pages for locations.
+Units of Veritechnology Electronics Corporation in the U.S.
'Viewing of some satellite TV channels may require the customer to obtain permission from, or make payment(s) to, the programming company. The customer
is responsible for compliance with all local, state and federal governmental
laws and regulations, including but not limited to construction. placement and
use. For use only in Continental U.S.
Address
L
CIRCLE
NO.
am not currently receiving one.
2
ON
FREE
City
State
CL -753
Zip
INFORMATION
CARD
-
ADDA DST\CTVE
EXTENSION PHONE RING
TO YOR TELERHO\E
BY MARK FORBES
ers can be used on a single telephone
line, and a remote can be used on a
25 -foot extension.
low -cost
(approximately
telephone -line -powered
$12)
tone ringer described here will enable
you to add an extension ringer in your
garage or other area where the telephone ring cannot be heard. It will
also make the ringing sound of a standard phone more pleasant.
The tone ringer is based on ICI
(Fig. 1) a two -tone oscillator whose
power supply and interface were designed specifically to be used with the
telephone system (so no dc power supply is required). Up to four tone ring-
THE
Circuit Operation. On
a non -busy
telephone line, about 50 V dc is present between tip and ring (red and
green wires, respectively). As shown
in Fig. 1, capacitor CI blocks this dc
voltage in the normal "hung -up' state.
To ring the telephone, an ac voltage
between 85 and 125 volts (peak -topeak) is applied between tip and ring
(the "ring wire" is not to be confused
TIP
(RED)
RING
IGREEN)
C2
22 yF
*SEE TEXT
Fig.
1.
T
C3
07uF
The tone generated by ICI is about 575 Hz.
PARTS LIST
C1
-1 -µF,
100 -V, capacitor
C2-22-AF, 35 -V, capacitor
C3- 0.47 -µF, capacitor
C4- 0.005 -MF, capacitor
C5- 0.22 -µF disc capacitor
IC1- ML8204
tone ringer (MITEL)
R1 -2.2 -kit, "2 -watt resistor
R2 -See text
R3 -See text
RECT1-Diode bridge (Radio Shack 2761161, or similar)
SPKR
-ohm loudspeaker
Note: The ML8204 (IC1) is available
-8
for
$5 from Mark Forbes, 1000 Shenandoah Drive, Lafayette, IN 47905.
To
SPEAKER
RED
GREEN
Fig. 2. Actual -size foil pattern and component layout are shown above.
58
with the "ring voltage "). This ac signal is coupled by CI and RI (which
acts as a current limiter) to RECTI, a
diode bridge, then filtered by C2.
Thus, the supply voltage for ICI is
provided by the phone line, and is
present only when the ac ring signal is
present. A threshold circuit is provided within the IC to prevent
"chirps" on the ringer often heard
when another phone on the same line
is being dialed.
When ICI is on, it generates an
audio tone of approximately 575 Hz
modulated between 510 and 640 Hz
at a 10 -Hz rate to simulate a bell ringer. The center frequency (575 Hz) is
determined by RC network R3 and
C4. This frequency can be varied
somewhat by the selection of components. For the given value of C4, resistor R3 can range from 180 to 330
kilohms. The modulating frequency is
determined by the R2 -C3 combination and with the given value of C3,
the range for R2 is roughly 120 to 180
kilohms. With proper selection of
these components, several telephones
can be differentiated by different
tones.
Capacitor C5 couples audio to the
speaker. The ICI manufacturer recommends the use of a 1000 -to -8 -ohm
transformer with a 15- kilohm resistor
across the primary. Acceptable performance has been obtained with the
direct connection illustrated in Fig. 1.
If a slight volume increase is desired,
the transformer may be used.
Construction. The simple circuit
can be assembled on a perf board or a
small pc board such as that shown in
Fig. 2. Double -check the polarity of
all components before soldering in
place.
When used with a miniature loudspeaker, the entire ringer can be
mounted within a small plastic enclosure which can be mounted near the
telephone, or up to 25 feet away as a
remote ringer monitor.
Keep in mind that some telephone
companies require that you inform
them that you are using one of these
circuits.
POPULAR ELECTRONICS
LEARNING QUIZZES
FOR
BY FREDRICK W. HUGHES
Device Symbol Quiz
Match each of the following solid -state device schematic symbols with its proper name.
74h,
4.
8.
10.
4
5.
7.
11.
J
1
a
T
17.
Choices:
a. diode
b. zener diode
18.
i.
c. LED (light emitting diode)
d. tunnel diode
o. capacitor diode
f. SCR (silicon -controlled rectifier)
g. DIAC (diode ac semiconductor device
h. TRIAC (triode ac semiconductor
switch)
I.
k.
I.
m.
n.
o.
p.
I
20.
19.
PUT (programmable unijunction
transistor)
LASCR (light activated SCR)
UJT ( unijunction transistor)
NPN bipolar transistor
PNP bipolar transistor
N- channel JFET (junction- field -effect transistor)
P- channel JFET
N- channel depletion -type MOSFET
(metal -oxide- semiconductor FET)
21.
q. P- channel depletion -type MOSFET
r. N- channel enhancement -type MOSFET
s. P- channel enhancement -type MOS-
FET
t. solar cell
u. OP AMP (operational amplifier)
1.1.Z 'e OZ 'a '6l 'i '9l
'Sl 'b't+l 'P 'El 's 71. 'u 'll
'o L '6 9 'd S 'i g 'w g 'e
'o 'LL
'9l
'q
'rot 'l'6'g'9
:sJeasuy
Transistor Troubleshooting Quiz
Troubleshooting transistor circuits is done by comparing dc
voltages of the transistor leads (Ve, Va and V[.) with the values of a normally operating circuit. Generally, when a transistor is conducting heavily its V, will be low. If it is cut off,
V, will equal +Vee. A change in the transistor characteristics or a change in the biasing components can affect the dc
operating voltages. Normal operating voltages are shown on
the circuit. Each question indicates the operating voltages
measured. Select the condition of the component from the
voltage indications given.
APRIL 1982
57
quizzes for learning
1. Vc=
8.
12 V, VB= 0 V, VE= 0 V
a. RA open
b. RB open
c. RL open
d. CE open
2. Vc=
3 V,
c. B -E shorted
d. C -E shorted
9. Vc=
VB= 2.8 V, VE= 2.2 V
a. RA open
b.
c.
d.
RB
RE
CE
3. Vc=
c. CE shorted
d. C -E shorted
VB= 2.4
V,
10. Vc=
VE= 1.8 V
12 V, VB
a. C open
b. C -B shorted
a. RL open
b. RE open
c. CE shorted
d. CE open
4. Vc=
2.4 V, VE= 0 V
E open
d. CE shorted
0 V, VB= 0.7 V, VE=
O
11. Vc=
V
12 V,
a. RL open
b. RE open
c. CE shorted
d. RA open
b.
c.
6 V, VB
=
c.
a. RL open
5. Vc=
VB= 2.4
V,
VE= 0 V
V6= 0.7
V,
VE= 0 V
B open
open
d. RB open
=
2.2 V, VE= 1.6 V, Vo,
=
2 Vp -p
RA
12. Vc=
12 V,
a. RA open
a. RL open
b. R6 open
c. RE open
d. CE open
b. RA open
c. RB open
d. C open
6. Vc=
1 V, VB= 0.7 V,
a. RB open
VE=
O
V
b. RL open
c. CE open
d. CE shorted
7. Vc=
12 V, VB= 0 V, VE= 0 V
a. RL open
b. B -E shorted
c. B -C shorted
d. E open
58
2.5 V, Va= 2.5 V, VE= 1.8 V
a. C -B shorted
b. RB open
open
open
open
12 V,
Vc =2 V, VB= 2.4 V, VE =2 V
a. RL open
b. RA open
(s8utpea.i
leatluapt ut ipso.' latm ialltuia io aseq
undo uy .olstsueil agi jo undo 1euualut
us si aiagl uagm Z I pus `I I`01 smalgo.d
io3 aeltuns aae sluauiainseaw a8e11on ag1
1e111 aloN) 'P Tl 'g 'L L 'o 'Ol 'B '6 'P '8 'q
L
'p
g 'p g
'e
'q
g
'q
'B
L
maNsuy
POPULAR ELECTRONICS
Diode Operation Quiz
A diode conducts when its anode is more positive than its
cathode (about +0.2 V for germanium and +0.4 V for silicon). Diodes can be used as rectifiers to clamp ac voltages to a
reference level and /or clip portions of an ac signal. If the
input to each circuit is a 20 V p -p sinewave, match each of the
following circuits to its proper output waveform. Consider the
diodes ideal, either completely open or shorted. (Answers may
be used more than once.)
loon
loon
VIN
VOUT
VIN
N
10K 0.
VIN
VOUT
10K
Z
ti
fl
2.
1.
oon
OUT
I o
5.
IOKn
4.
-O VOUT
VIN
VOUT
To
5V
O
/L
10K 0.
loon
VINO
ti
v
VOUT
3.
100n
VIN
VIN
VOUT
ti
6.
V
loon
VOUT
ti
5V
o
N
+-
O
7.
5V
=
TO
5V
O
O
8.
Choices:
+10V
a.
- IOV
V^
-I0V
+10V
d.
OV
+5V
c.
b.
OV
+10V
e.
Ov
- 5V
i
OV
, \
+ 5V
OV
-5V
-10V
'P
Op Amp Quiz
47K
8 'e'L' ;9'0'g'e q'q.E'q
¿'e
1.
:sJeMsuyf
The input voltage is + V to all of the op amp circuits shown.
Match each circuit with its proper output voltage. (Power
supply voltage is ± 12 V.)
1
v,
56K
2.
10K
IOK
2K
10K
3.
I0K
6.
APRIL 1982
59
quizzes for learning
Choices:
a. 0 V, b.
+6.6
V, c.
+1
((xs/xol)zA + (xz/xol)IA)
V, d.
Suiuiuins
'" A) utES
-
`S
-4.7 V,
=
g
18
iamollo! aSElIoA
L
(olaz st lndlno `lBnba air
slndut =Fin) lolB.iBdwoo a8E110A `B
- 10.8
e.
V, f.
-
V, g.
-7 V,
h.
V.
laMollo! a8E110A Su9.10nut-uou `o £
oI /31[90 + I = Ab, alagnA ` "'AAt,
_ '" A) JagOw8 Sutl.1anui-uou `g
NOI /NLb = AV aiagAk `"lAAb' =
"rnA) aagildwE SuTllanul `p
:sueMSUrr
s
z
(A+IA)uagAn)
`IBnba a.B siolsisa.c
agildw8 Suiwwns oilawglu8
IlE
'"OA
+Vcc
-2
(,Clddns A- d° %06 lnog8
sal8.[nlBs Jagtlduiz `NoEgpaaj ou) a
Transistor Operation Quiz
VIN
1
I
b
`q
Some transistors are "normally on" (conducting) devices with
zero bias, while others are "normally off " (not conducting)
and must be turned on by a positive or negative bias or voltage. Match the voltages given to the following circuits in
order to turn on the transistors. (Answers may be used more
than once.)
+VDD
+ VDD
N
-Vcc
VIN
VINO
VIN
P-chl.
N-chl.
NPN
Bipolar
1.
N-chl.
JFET
Dep.-type
MOSFET
Bipolar
Enh.-type
MOSFET
2.
3.
4.
5.
+VDD
'NOD
VIN
+vcc
+V88
N
IH
VIN
VIN
PNP
VIN
.=
N-chl.
P-chi.
Dep.-type
MOSFET
Pchl.
6.
JFET
Enh.-type
MOSFET
UJT
Bipolar
7.
8.
9.
10.
NPN
Choices:
+v
a.
b.
p
q
60
'e
g
'e
g
_ó
'o
-1
L
'o
E
g 'q ç 'q p '3
C.
E
'3
z
'e
o
L :sjensuy
POPULAR ELECTRONICS
BUILD A
SYNCHRONOUS DETECTOR
FOR
AV
RADIO
BY DAVE HERSHBERGER, W9GR
Improves frequency response and removes distortion
THERE IS a misconception that
AM radio is inherently a low fidelity medium. Many people assume
that since the channel spacing between AM stations is limited to 10
kHz, there must be some legal restriction to 5 -kHz audio response. This is
not true, since FCC regulations permit full frequency response to 15 kHz
(the same as FM) and the FCC frequency allocation structure takes this
into account. However, geographically adjacent transmitters must be
spaced at least three 10 -kHz channels
apart to provide sideband interference
protection (FCC Part 73.40, par. A,
sub. 12 and 73.182).
AM has a major advantage over
FM radio in that it provides better
reception in moving vehicles because
of the absence of rapid -flutter multi path effects. And AM signals travel
much farther than FM signals, thus
expanding the listening range.
Most AM radios still use envelope
(diode) detection that, when coupled
with narrow i -f filtering, greatly restricts the audio bandwidth to produce "muddy" sounding audio because the higher audio frequencies are
removed. Envelope detection also produces distortion, further adding to the
poor sound.
An advanced method of demodulating an AM signal is to use a wideband
i -f
(when reception conditions per-
used with a wideband AM tuner, the
synchronous detector will offer reception quality rivaling FM.
mit), and replace the envelope detector with a synchronous detector. The
wide i -f allows a better frequency
response, while the synchronous detector will remove distortion produced
by selective fading, slight receiver
mistuning, modulation overshoots in
the i -f filters (transient intermodulation distortion), co- channel interference, and interference or cross modulation. Impulse noise interference is
also reduced.
Theory.
A synchronous detector recovers an unmodulated carrier from
the incoming signal and uses it as a
reference to discriminate against
noise and distortion. Usually, a phase locked loop (PLL) is used to regenerate the carrier, which then drives a
product detector (multiplier or
DIODE
DETECTO
IF
AUDIO
OUT SIGNALS
IF
SIGNA
L
RECOVERED
JNMO DUL ATED
CARRIER
AUDIO
OUT.
T
FILTER
IA)
RI
Fig. 1. Simplified diagram of the basic
synchronous (A) and envelope (B) detection circuits.
This article will show you how to
build a synchronous detector to replace the envelope detector in your
AM receiver. It can be used with most
any AM (or shortwave) receiver having a 455 -kHz i -f. The circuit includes
optional SSB detection capability to
reject interference such as adjacent
channel or other carriers, which occurs primarily in one sideband of a
conventional DSB AM signal. When
R
LOCK
usb
04:6
INb
rune
on
-oc-O
11104.01.1
env.
off
PLI
Synchronous Detector
switch) to recover the modulation. In
a more familiar application, synchronous detection is commonly used to
demodulate FM stereo L -R and color TV chrominance signals. Figure
shows basic synchronous and envelope
detection systems.
Some examples of common AM
phenomena are shown in Fig. 2, along
with the resulting outputs of envelope
and synchronous detectors. In each
case, the synchronous detector gives
an undistorted output, as opposed to
the envelope detector. (The frequency
response may not be flat, but there
will be no distortion.) The envelope
detector works correctly only when
the carrier is large enough, and when
the sidebands are perfect mirror
images of each other in both amplitude and phase. The synchronous detector, not having this restriction, can
demodulate a much wider range of
AM signals such as DSB AM, DSB
AM with reduced carrier, SSB with
full or reduced carrier, vestigial sideband (VSB) AM, quadrature AM,
1
B1
BUY ONE
of these great professional books
when you join the
THE BYTE BOOK OF PASCAL Edited by
Blaise W. Liffick. 340 pp.. illus. In this timely
book you get up -to -date Byte articles on the
subject -from a general introduction to system hardware -from top experts in the field.
Includes two versions of a Pascal compiler.
one written in BASIC and the other in 8080
assembly language ... a p -code interpreter
written in both Pascal and 8080 assembly language ... Pascal vs. COBOL ... a chess playing program ... an APL interpreter ... and
more.
789/673
Club Pr.. $19.95
Pub Pr.. $25.00
MICROPROCESSORS AND LOGIC DESIGN. By Ronald L. Krutz. 467 pp illus. First
.
microcomputer designed for practicing engineers. This logically organized book provides
a thorough understanding of microcomputer
hardware, fabrication technology, software, and
interfacing.
Pub. Pr., $27.95
Club Pr., $21.50
582349 -7
AUTOMATIC DATA PROCESSING
HANDBOOK. Edited by The Diebold Group.
976 pp., 269 illus. Written by a staff of internationally recognized authorities on ADP, this
comprehensive handbook explains systems,
programming and the languages, communications processes, and the design and installation of today's computers.
168/075
Pub. Pr., $49.95
Club Pr., $37.50
MICROPROCESSOR PROGRAMMING
AND SOFTWARE DEVELOPMENT By
F.G. Duncan. 320 pp., with diagrams, tables.
and index. For the experienced professional
who's a newcomer to microprocessors ... this
is the introduction to microprocessor programming you've been hoping for! One careful
step at a time. the author tracks through his
subject with thoroughness and clarity. The detailed discussion is based on four widely used
processors -the Motorola 6800. Intel 8080
and 8085, and Zilog Z80.
582069 -2
Pub Pr., $28.00
Club Pr., $21.50
COMPUTER NETWORKS. By Andrew
S.
Tanenbaum. 517 pp., 201 illus. Covering a
complex subject from the topology design problem to distributed data bases and distributed
operating systems, it uses an ISO model in
which networks are divided into seven layers ...
and follows the structure of the model to a considerable degree without straining your knowledge of calculus.
582362 -4
Pub. Pr., $28.00
Club Pr., $21.50
SOFTWARE ENGINEERING Edited by
Randall W. Jensen and Charles C. Tonies. 580
pp., illus. This book examines all phases of
software engineering. It provides an integrated treatment of the true foundations of effective project management and also serves
as a dependable guide for designing better
programs, implementing them more efficiently,
and protecting them from theft or misuse.
788/367
Pub. Pr., $29.95
Club Pr.. $23.25
THE GIANT HANDBOOK OF COMPUTER PROJECTS By the Editors of 73
BE SIRRE TO CONSIDER THESE
ADVANCES IN COMPUTER PROGRAMMING
MANAGEMEVT. By T A Rullo
582170 -2
Pub.. Pr., 929.50
Club Pr., $23.95
DESIGN AND STRATEGY FOR DISTRIBUTED
DATA PROCESSING. By J. Martin
582437
X
Pub. Pr.. $37.50
Club Pr., $26.50
TELECOMMUNICATION SYSTEM ENGINEERING ANALOG AND DIGITAL NETWORK DE
SIGN. By RL. =reeman
582165 -6
Pub. Pr., $32.50
Club Pr., $25.75
DIGITAL COMPUTER FUNDAMENTALS, 5 /e.
T C
By
Bartee
038/946
Pub. Pr.. 922.95
Club Pr., $17.50
MICROPROCESSORS/MICROCOMPUTERS
SYSTEM DESIGN.
637 585,
By Texas Instruments. Inc
Pub. Pr., $26.95
Club Pr.. $20.95
IMPORTANT TITLES AS WELLHOW TO DESIGN, BUILD A PROGRAM YOUR
OWN WORKING COMPUTER SYSTEM. By R P
Hauland
788/987
Club Pr.. $12.70
Pub. Pr.. $14.95
MICROPROCESSORS AND MICROCOMPUTERS: OneChlp Controllers to High -End Sys
tems.
191/417
By Electronics
Pub. Pr.. $27.50
Club Pr.. $21.50
MICROCOMPUTER INTERFACING HANDBOOK: A/D And
582188 -5
D /A. By
J
J
Pub. Pr., $14.95
Carr
Club Pr.. $12.70
ASSEMBLERS, COMPILERS, AND PROGRAM
TRANSLATION. By P Calmgaert
582110 -9
Pub. Pr., $20.95
APPLE PASCAL.
491/712
Club Pr., $15.95
By A. Luehrmann & H. Peckham
Pub. Pr., $14.95
Club Pr., $10.95
Magazine. 504 pp., 217 illus. This book shows
you how to build computer equipment from
scratch either as a hobby in itself or as part
of another interest such as amateur radio or
electronics. The book starts with the fundamental and then covers such projects as computer games. a bionic clock, a computer controlled thermometer. and much more.
-
582012 -9
Pub Pr., $15.95
Club Pr., $13.50
PRINTED CIRCUITS HANDBOOK.
Edited by C. F. Coombs, Jr. 2nd Ed., 634 pp.,
595 illus. Covering the subject of printed circuits from the design's idea to final acceptance, this enormously well- received work in-
cludes double -sided plated boards through
printed boards and also the major variations
such as multilayer and flexible circuits.
126/089
Pub. Pr., $38.50
Club Pr., $28.95
PRINCIPLES OF INTERACTIVE COMPUTER GRAPHICS. By William M. New-
MICR-?-
_
PROCESSORS
AND-
LOCrIÇ
DESIGN
man and Robert Sproull. 2nd Ed., 544 pp.,
illus. Now in a revised, updated Second Edition, this is a volume that has long been THE
standard source of information for designers!
Club Pr., $22.50
463/387
Pub. Pr., $28.95
COMPILER DESIGN AND CONSTRUC-
TION. By Arthur B Pyster. 357 pp.. with sample programs, charts, diagrams. and a corn prehensive index. A practical introduction to
compiler writing that also shows you how to
transform your design into a working product.
The book uses PASCAL as the source language -and the IBM 360/370 Assembly Landemonstrate
guage as the target language
how to build a clearly organized. error -free corn -
-to
piler.
582026 -9
62
Pub. Pr.. $24.50
Club Pr., $19.95
POPULAR ELECTRONICS
and
GET ONE FREE
(values up to $60.00)
COMPUTER PROFESSIONALS' BOOK CLUB
ELECTRONICS DICTIONARY. Edited
PRINCIPLES OF FIRMWARE ENGINEERING IN MICROPROGRAM
by
John Markus. 4th Ed., 768 pp., 1,173 illus. The
indispensable standard authority on the meaning of 17,090 terms that make up the language
of today's electronics is now available in a revised, updated edition. A model of clarity, conciseness, and authority, it is the best place to
look for speedy retrieval of the information you
need.
404/313
Pub. Pr., $29.95
Club Pr., $22.50
CONTROL. By Michael Andrews. 347 pp.,
202 illus., and tables. Organizing the many design considerations from both the hardware and
software viewpoints, this book provides valuable tools for developing a digital system
through algorithmic state machine techniques in
ROM -centered structures.'
MICROPROCESSOR
APPLICATIONS MANUAL. By Motorola
ELECTRONIC GAMES, Design, Programming and Troubleshooting. By W.
582200 -8
Semiconductor Products, Inc. 720 pp., illus.,
81/2 x 11 format. With nuts - and -bolts practicality, this manual by the Motorola people (who
should know) gives you detailed applications
information on microprocessors and assumes
no prior knowledge on your part about MPUs.
435/278
Pub Pr., $42.50
Club Pr., $29.50
COMPUTER SYSTEMS ARCHITECTURE. By Jean -Loup
Baer. 626 pages, 263
charts. diagrams 8 tables. A book that takes
software and hardware out of their respective
pigeonholes ... and describes their interaction
with the thoroughness of an encyclopedia! You'll
find this is a thorough and valuable integration
of data processing's "two worlds" and their fascinating relationship.
Bruce Artwick, 352pp., 117 illus. In this up -todate, complete design guide you'll find the detailed descriptions and explanations necessary to enable you to seect, build, and interface microcomputer systems to virtually all
applications. Advanced interface devices and
methods are thoroughly examined and illustrated, with emphasis on design procedures.
optimization, performance, and reliability
789/436
Pub. Pr., $24.95
Club Pr., $18.95
Tiberghien. 471 pp., illus. This powerful tool
clarifies and reconciles the major Pascal dialects ... organized alphabetically from ABS to
WRITELN, and through symbols from' to ( ")
helps you get all there is from Pascal!!
.
Club Pr., $27.50
BASIC SCIENTIFIC SUBROUTINES,
DATA STRUCTURES USING PASCAL.
Vol. I1. By Fred Ruckdeschel. 384 pp., illus.
Here's the eagerly awaited second volume of
the complete scientific subroutine package
written in BASIC with program listings in North
Star and standard Microsoft.
542/023
Pub. Pr., $23.95
Club Pr., $18.95
By Aaron M. Tenenbaum and Moshe J. Augenstein. 544 pp., illus. With its emphasis on structured design and programming techniques, this
definitive work takes you on a trailblazing journey through Pascal. Separate chapters are
devoted to the stack. recursion, queues and
lists, Pascal list processing, trees, graphs and
their applications.
Pub. Pr., $23.95
Club Pr.. $18.50
582230 -X
ENCYCLOPEDIA OF COMPUTER SCIENCE. Edited by Anthony Ralston and C. L.
Meek. 1,500 pp., 60 illus., 100 charts, 7 x 10
format. This first and only in -depth coverage of
the entire field of computer science in a single
volume is comprehensive and completely up
to date.
769 /01X
Pub Pr., $60.00
Club Pr., $39.95
582208 -3
THE PASCAL HANDBOOK. By Jacques
Pub. Pr., $35.00
Subrout,
Club Pr., $17.95
H. Buchsbaum and R. Mauro. 335 pp., 338
illus. Information you need to design, program,
and troubleshoot electronic games is right
here in this widely popular hands -on guide.
Pub. Pr., $26.95
Club Pr., $20.95
087/210
MICROCOMPUTER INTERFACING By
582365 -9
Pub. Pr., $21.95
BASIC Scienrtfi(
Pub. Pr., $24.50
Club Pr., $18.95
Choose any one of these books at the special club discount, and
select any other as your gift Free of Charge when you enroll
Why YOU should join now!
-
BEST AND NEWEST IN YOUR FIELD Bt)( ks are selected from a wide
range of publishers by expert editors and consultants to give you continuing access tp the best and latest books in your field.
BIG SAVINGS Build Your library and save money toot Savings ranging
up to 30% or more off publishers' list prices usually 20% to 25 %.
-
-
BONUS BOOKS -You will immediately begin to participate in
our Bonus Book Plan that allows you savings of between 70 % -80%
off the publishers' prices of many professional and general interest hooks!
CONVENIENCE -12 -14 times a year (about once every 3 -4 weeks) you
receive the Club Bulletin FREE. It frilly describes the Main Selection and
alternate selections. A dated Reply Card is included. If you want the Main
Selection, you simply do nothing- it will be shipped automatically. Ifyou
want an alternate selection or no book at all -you simply indicate it on
the Reply Card and return it by the date specified. You will have at least 10
days to decide. IC because of late delivery of the Bulletin you receive a
Main Selection you do not want, you may return it for credit at the Club's
expense.
As a Club Member you agree only to the purchase of 3 hooks (including
your first selection) during your first year of membership. Membership
may he discontinued, by either you or the Club at any time afteryou have
purchased the first selection.plus 2 additional books. Orders from outside the 11.S. cannot be accepted.
rMcGraw -Hill Book Clubs
Computer Professionals'
Book Club
P.O. Box 582,
Hightstown, New Jersey 08520
Please enroll me as a member and send me the two books indicated, billing me for my first selection only at the discounted
member's price, plus local tax, shipping and handling charges.
agree to purchase a minimum of 2 additional books during my first
year of membership as outlined under the Club plan described in
this ad. A shipping and handling charge is added to all shipments.
Write Code No. of the
Write Code No.
FREE selection here
of First Selection here
I
-
Other McGraw -Hill Book Clubs:
Accountants' and Controllers' Book Club Architects' Book Club Chemical
Engineers' Book Club Civil Engineers' Book Club Electronics and Control
Engineers' Book Club Mechanical Engineers' Book Club
For more inlitrmarinn, write to:
McGraw -Hill Book Clubs
1221 Avenue of the Americas, 26th fl., New York, NV 10020
APRIL 1982
Charge my
VISA
MASTERCARD
I
Exp. Date
Credit Card #
Signature
Name
Address /Apt #
City. State. Zip
Corporate Affliation
This order subject to acceptance by McGraw -Hill. All prices subject
to change without notice. Offer good only to new members. Orders
from outside the U.S. cannot be accepted.
P39564
65
synchronous detector
etc. These forms of AM, which envelope detectors cannot properly demodulate, are produced under commonly
occurring natural circumstances.
Even though the broadcast signal
starts out as conventional DSB AM,
receiver mistuning, skywave reflections, etc., can change the AM signal
into one or a combination of these other forms.
Ciroult Description. The block diagram of a synchronous detector appears in Fig. 3. The circuit accepts a
sample of the receiver's i -f (preferably
taken from the last i -f stage) and a
PLL is used to recover the unmodulated carrier. The circuit also provides automatic switching between
envelope and synchronous detection.
When the PLL is unlocked during
tuning or absence of signal, the envelope detector portion provides the audio output. When the PLL locks onto
the carrier, the circuit automatically
switches the audio output to the synchronous detector. This action avoids
audio -disturbing beat notes that
would otherwise occur during tuning.
The circuit in Fig. 3 includes an
optional SSB detection feature
(shown within the dotted box). With
the addition of audio phase -shift networks, it is possible with synchronous
detection to receive SSB, or just one
sideband of a DSB signal. This technique is usually used as a SSB generation method, but works equally well
for reception. The circuit also includes
a notch filter to remove any audible
10 -kHz beats produced by adjacent
channel transmitters. The complete
schematic is shown in Fig. 4.
Emitter follower QI buffers the i -f
input and drives high -speed operational amplifier ICI. Automatic gain
control (agc) of ICI is accomplished
by LED -LDR (light- dependent resistor) combination LDRI, which produces far less distortion than conventional gain control techniques.
AGC /buffer amplifier ICI drives
three analog multiplexers (IC4A,
IC4B, and IC4C) used as balanced
demodulators. The three demodulators, after RC lowpass filtering, provide in -phase ( "I "), quadrature
( "Q "), and envelope audio. The I
channel is the synchronously detected
DSB signal, while the Q channel is
related to sideband asymmetry. Normally, the Q channel is zero, but if
there is phase or amplitude imbalance
between the upper and lower side bands, the Q channel will contain
audio. After the PLL locks, the Q
channel detector detects phase.
de
The envelope detector uses differential pair Q2/Q3 to hard -limit the i -f
signal, and the resulting CMOS level
square wave drives envelope demodulator IC2C. This gets around the limitations of conventional diode detectors, namely, diagonal clipping and
diode- threshold distortion. The envelope detector supplies the audio output
when the PLL is unlocked, and provides AGC sensing voltage to IC5A.
The difference between synchronous
detector IC2A and envelope detector
IC2C is in the drive signals to the analog multiplexers. The synchronous detector always has a pure unmodulated
carrier as its drive signal, while the
envelope detector will have phase
modulation of its drive during any of
the nonideal conditions in Fig. 2.
Switch SI in the I circuit selects the
detection mode with TUNE, the normal
position of the switch. This mode provides slow locking and rapid unlocking. In this mode, the output signal is
taken from envelope detector IC4C.
After tuning in a signal, the logic will
switch the output to synchronous detection. The locked bandwidth at 25
Hz is too narrow to track the carrier
as the receiver tuning knob is being
adjusted. Beat notes are avoided by
deliberately delaying the output of
lock detector IC4D for envelope detection while tuning, and synchronous
detection after the hand is taken from
the tuning knob.
The middle position of switch Si,
HOLD, provides rapid locking and slow
unlocking, and is intended for use
with signals that are subject to fading.
If the carrier amplitude momentarily
drops below the lock threshold, unlocking is delayed several seconds.
With the absence of an input error
P
SPECTRUM
HA SOR
SIGNAL
DIAGRAM
signal, integrator IC5B (the PLL loop
filter) will hold the afc voltage during
fades. This mode cannot be used for
receiver tuning. as beat notes would
be heard during the unlock delay period. The last position of SI selects the
ENV detection mode.
The PLL operates in a wideband
mode when unlocked, and automatically switches to a narrowband mode
when locked. This allows a wide
acquisition range, a fast lock time,
and a narrow bandwidth-conflicting
requirements in a simple PLL. When
unlocked, the hard -limited i -f signal
from Q2/Q3 is compared with the vco
signal in phase /frequency detector
IC8. When the loop locks, a dc component (due to the carrier) will appear
at the output of I- channel detector
IC4A. This level will trip lock detector
IC4D, an op amp used as a comparator. The lock detector switches the
audio output, the PLL control loop,
and drives indicator LEDs. When
locked, the Q- channel detector is used
to control the loop instead of phase/
frequency detector IC8. The locked loop bandwidth is about 25 Hz; therefore, when the loop is locked, it operates as a very narrow bandwidth filter, recovering the unmodulated carrier, and rejecting the modulation
sidebands.
The vco uses analog multiplexer
IC3C as the active element. At first
this may seem a bit strange, but IC3C
is connected as a CMOS logic inverter, and is used as such in a conventional CMOS L/C oscillator. Varactor
diode D6 tunes the oscillator to 455
± 15 kHz.
In PLL loop filter IC5B, dc feedback is entirely through the vco and
Q- channel detector (or IC8 when un-
ENVELOPE
DETECTOR
OUTPUT
SYNCHRONOUS
DETECTOR
OUTPUT
use
CARRIER
LSO
(A)
IIII
USB
CARRIER
(8)
LSB
Use
CARRIER.'
tc)
(D)
V V
I
rnn
LSB
CARRIER
USB
J1.11,_
AA)
LSB
Fig. 2. Some common AM phenomena: (A) Conventional unperturbed
AM signal. Both detectors give undistorted outputs. (B) Reduced carrier.
Caused by selective fading or directional transmitting antenna.
(C) Sideband asymmetry- selective fading or receiver mistuning.
(D) Wrong carrier phase- skywave propagation or receiver i -f phase asymmetry.
POPULAR ELECTRONICS
III
OLOCK INDICATOR
LOCK
DETECTOR
ABC
BUFFER
INPU
OPTIONAL SSO CIRCUITS
I
T
90°
l
AUDIO
IOKH,
ADDER/SUBTRACTORI
TUNING
METER
NOTCH
FILTER
LOOP
FILTER
w
AUDIO
PHASE
SHIFTERS
USB
AF
OUTPUT
DSB
CMOS
SWITCH
VCO
CMOS
SWITCH
LSB
0 AUDIO
ARC SENSING
1
ENVELOPE AUDIO
LIMITER
PHASE
DETECTOR
locked). This forces the Q- channel
detector to have a dc component equal
to zero, which in turn forces the vco
phase to be correct regardless of
receiver tuning (Type II loop). Because ICSB "sees" varying source resistances as IC3B switches, a BiFet or
Fig. 3. Block diagram of the
synchronous detector circuit.
BiMOS type of op amp must be used
to minimize bias current effects.
The vco drive to IC2A, the I -channel demodulator, must be shifted 90
degrees from the drive to IC2B, the
Q- channel demodulator. The network
comprising RS, L2, and C6 forms a
passive L/C 90-degree phase shift
network.
$$B Option. To obtain SSB reception, the I and Q signals are applied to
active audio phase -shift networks having a flat frequency- response charac-
e
Power Line
Filters
NETWORK /NG
filters protect any sensitive electronic
equipment from power line transient damage
These
and radio frequency interference. Both
models offer common mode and differential
mode surge suppression for power line
"spikes ". Rf interference is suppressed using
both inductive and capacitive components.
Ideal for computers. test equipment or TV.
LF2 a duplex outlet, 120V, 8 amps max
$39.95
LF6 three separately filtered duplex outlets,
120 V, total fused capacity 15 amps,
power switch and indicator lamp
'
$59.95
Add $2.50 shipping and handling per order.
with order and provide street address
UPS shipment. Ohio residents add Sales Tax.
Charge card buyers may call toll free:
Send check
for
<X0
R. L.
If you like to communicate with others, the CompuServe
Information Service is your most effective vehicle. Why? Because
we have the largest customer base of any videotex system in North
America. And we have hundreds of new subscribers each week.
"Talk" to other CompuServe subscribers via CB simulation (it's the
most popular offering on our network). Send E -mail, use the
electronic bulletin board and exchange information with computer
manufacturers, Special Interest Groups and publishers.
Play a variety of networking games with your own group or
complete strangers from New York to Chicago to LA.
Ask for a demonstration at a Radio Shack'" Computer Center.
Videotex software is available for various brands of personal
computers.
CompuServe Information Service, 5000 Arlington Centre Blvd.,
Columbus, Ohio 43220. (614) 457-8650.
1. 800.543.5613
In Ohio, or for
information call:
DRAKE
1- 513.866.2421
-
DRAKE COMPANY
CompuServe
540 Richard Street, Miamisburg, Ohio 4534?
INSTITUTIONAL AND DEALER INOUIRIES INVITED.
CIRCLE NO. 13 ON FREE INFORMATION CARD
APRIL 1982
CIRCLE NO 9 ON FREE INFORMATION CARD
67
synchronous detector
+ 6V
+6V
90'PHASE
R2
C6
1008
4551013
INPUT
JI
S0mV
2V
P/P
I
2700E
SHIFT
PHASE ADJ.
L2
30046
R5
3
C3
.I yF
CI
.00IyF
IC4A
AGC/
BUFFER
LORI
/'
6
CI
R
4%
2
_
67
R6
3.36
13
IC2A
C9
2
y
47K
R22
4.7 K
CIO
.001#FT
AV mpm
R21
686
00,,F
LI
C4
IyF
C5
390pF
R4
IRK
TO
ICB
PIN 3
10
R9
6_86
RB
3.3K
IC28
6V
CII
2
00I4F
R12
2.2 6
C7
1
/'
5
IC4B
C12
.001PF/}
I
G41N
R25
R24
R23
5K
2.26
4.7K
TO
.001yF
CI9
ICB
PIN 6
RIO
3.3
3
IC2C
6
K
4
1
B
TI
C13
0010F
T
ENVELOPE
C14
.001yF
9
R26
4.7K
R27
4.76
RI9
R18
+6V
--KKAMNJ
IOOK
156
HOC INTEGRATOR
CIB
R20
3.3M
yF
TUNING
PLL
FILTER
MI
R32
SO
-0 -5044
HOLD
6
R28
ENV.
16914
C20
D2
IN914
UNE
SIA
DI
SIB
MODE
3
C21
1206
IyF
R30
2.2K
+6V
R
D3
16914
IK
1017
10yF
00pF
R29
4H-"OF
T
LOCK
DET
654
IOOK
2
4
CIS
16
2.2,F
NC
IyF
RSB
R31
7500.
V
856
750/1
TO
15
IC3A
IC313
RS7
IOOK
DS
LOCK
PIN II
11
C22
IOOpF
6
FRON
I
74
C19
FROM
ASE/FRED.
DET.
5
4
8
932
IC3B
PIN 10
- 6V
6
2.2
+6V
TO
K
IC7A
PIN
FROM
C24
2.2yF
846
I+
I
3
IC28
PIN 10
3
IC3
q
+8V
750pF
01.,
C30
330pF
R47
ENVELOPE
2.26
C
R34
836
5.6K
22011
IPIN
8
C25
R33
T
390 PF
5.66
R39
36K
C27
11
VCO
635
2.26
2.2 yF
C29
-003yF
30001
3K
4
C23
L3
RIB
6V'
IC3A
C28
D6
MV2115
001yF
R37
.01yF
2.46
R38
47K
+6V
Fig. 4. Schematic diagram of the
synchronous detector is shown
above and opposite. The power-supply
circuit is at top on opposite page.
J2
AUDIO
OUTPUT
IOK
R45
7
R44
330K
3
10
390
IO
KHI
NOTCH FILTER
68
840
83
2.46
R42
106
POPULAR ELECTRONICS
+6V
07
FI
R50
164004
1/24
teristic and a frequency -dependent
phase shift. These networks have a
nearly constant 90- degree audio
phase difference ( ± 3°) over the
range of 50 to 12,000 Hz, which provides a minimum of 31 -dB unwanted
sideband suppression over that
range.
The allpass filter outputs are applied to IC7A, which is used as an
inverting
buffer /adder /subtractor.
For DSB reception, this IC forms a
unity -gain inverting buffer. For lower
sideband (LSB) reception, IC7A adds
the two allpass signals, and subtracts
them for upper sideband (USB).
Switch S2 selects the DSB, USB, and
LSB modes.
The 10 -kHz notch filter is formed
by the IC7B circuit. This stage must
have a high gain /bandwidth product
for proper operation. Do not substitute an op amp of lesser performance
than the TL072 suggested.
3311
+6V
C42
C43
C44
4
S3
POWER
OIyF
C34
-6V
C35
C45,
C46,C47
470yí
470yF
OIyF
+6V
IN4004
08
-6V
C49
014E
435.BHz
30 26z
R59
52 76
C50
IyE
R60
365221
10
T
9
445561
R61
357211
3
ICSC
2
IC6A
IC68
T
C5
C51
14F
5
.01RP
R65
R66
R67
R68
R69
10K
10K
10K
IOK
IOK
R77
R78
10O
108
44.6
R70
IOK
U58
52
p-+0OSB
SIDEBAND
TO
C24
SELECT
LSB
ALL -PASS FILTERS
134.7
1377 Hz
Hz
R62
11
82K
0
C53
IyF
R71
10K
ROO
10K
12'
11
T 3
R.63
56K
C54
.O,yP
1
879
19.87 KHz
IOK
R.64
801K
12
T
^3
1O'
IC60
.0018P
IC6C
T
R72
873
R74
R75
R76
10K
10K
IOK
IOK
10K
PARTS LIST
C1,C2,C9 through C14,C19,C27-0.001AF disc capacitor
C3,C4,C36,C37- 0.1 -µF disc capacitor
C5,C25,C26- 390-pF mica capacitor
C6- 270 -pF mica capacitor
C7,C8,C28,C38 through C49- 0.01 -µF
disc capacitor
C 15,C23,C24- 2.2 -µF, 15 -V electrolytic
C 16
-pF, 15-V electrolytic
10 -µF, 15 -V electrolytic
C 18,C21- 0.1 -µF Mylar capacitor
-1
IC8- 74C932N phase /frequency detector
IC9 -7806 or LM340T -6 voltage regulator
IC 10 -7906 or LM32OT -6 voltage regulator
J1,J2 -RCA phono jack
L
through L3- 230 -440 -0H adjustable
coil (Midland 25 -702, 25 -705, or equiv,)
LDR1- LED /LDR (Vactec VTL5C2 or sim1
M1-50-0-50 microammeter (Midland
C20,C22- 100-pF disc capacitor
01 through
C32- C35 -470 -µF, 25 -V electrolytic
C50,C51,C53- 0.1 -µF, 1% capacitor
C52,C54- 0.01 -AF, 1% capacitor
C55 -.001 -µF, 1% capacitor
D1 through D3 -IN914 diode
D4,D5 -Red LED
D6- MV2115 varactor diode
N4004 diode
D7,D8
IC1- LM318N op amp
IC2,IC3- CD4053BCN triple two -input
CMOS multiplexer
IC4,1C5,IC6- TL074CN quad op amp
IC7- TL072CN dual op amp
-1
APRIL 1982
23-
207 or equiv.)
Q3- 2N3904
transistor
The following are v4 -W, 10% resistors
unless otherwise noted:
R
1- 47 -kt2
R2,R 16 -100
-18 ktl
R6,R8,R10,R48 -3.3
R7,R9,R111
-6.8
-1
kS2
-2.2
k12
R14,R49-470
R15 -2.0 ktl
R18,R54,R57 -100 ktl
R19-15 ktl
10 -ktl
R44 -330 ktl
R50,R51 -33
R52 -2.7 kit
R53 -2.2 MO
t1,
potentiometer
1/2
W
R56,R58-750
R60 -3.65 kt2, 1%
k12
kt2
R 12,R30,R35,R46,R47
R20 -3.3 Mtl
R21 through R23,R26,R27,R38 -4.7 kit
R25
-ktl potentiometer
-5
-1.3 kS2
R32 -82 ktl
R33,R34 -5.6 k12
R36 -220 9
R37,R43 -2.4 162
R39,R41 -36 kt2
kSl, 1%
S2
R3,R5,R13,R17,R45,R55
R4
R31
R40,R42-
ilar)
C17-
C29- 0.003 -µF disc capacitor
C30- 330 -pF mica capacitor
C31- 750 -pF mica capacitor
-1
R28
M12
R29 -120 ktl
-3.57
kt2, 1%
R62-11.8
MI, 1%
R61
R63 -11.6 k12, I%
R64 -8.01 kSl, 1%
R65- R81 -10 kil, 1%
R82 -680 SZ
SI -Dpdt center -off toggle switch
S2 -Spdt center-off toggle switch
S3 -Spat toggle switch
T1.10 V, 250 mA
Misc.- Prototype
board, suitable enclo-
sure, sockets, mounting hardware.
89
synchronous detector
Construction. The synchronous detector can be built using prototyping
pc breadboards. While custom pc
boards may have a "professional" appearance, users of prototype breadboards enjoy a significant luxury
the ability to modify a circuit without
cutting and drilling. If the FCC finally selects an AM stereo system (see
PoPu LA R ELECTRON ICS, December,
1978), some may wish to modify this
circuit for an AM stereo. The synchronous detector can be changed into
an AM stereo decoder for most of the
proposed AM stereo systems, with
some modifications and additions.
The layout is not very critical as
long as good construction practice is
observed. Keep large- signal i -f circuits (Q2, Q3, IC2, IC3, and IC8)
away from the i -f input (Q1, ICI).
Try to keep vco output and limiter
output signal leads short.
SSB detection capability is optional. If it is omitted, leave out SSB
audio phase shifters IC5C, IC5D,
IC6, and adder /subtractor IC7A.
Connect IC4A pin
to C23, and
reverse the polarity of C23. Replace
R24 and R25 with a fixed 4.7 -Id/
resistor.
Because component tolerances are
critical in the allpass (SSB) filters,
some selecting and matching of resistors and capacitors is required to
obtain the exact RC value in each section. Several methods are available
for selecting these components. The
easiest way would be to use I%-tolerance parts. But, since the correct 1%tolerance parts may be hard to find,
there are alternative methods. Resistors R65 through R76 must be
matched pairs. R65 must be matched
to R66, R67 matched to R68, etc., but
each pair need not be matched to any
other pair. For example, R65 and R66
could both be 10.2 kit while R67 and
R68 could both be 9.7 kit. Any value
between
kit and 100 k12 is suitable
for matched pairs R65 -R76. You can
use a digital ohmmeter or bridge to
match these parts. Do not use carbon
composition resistors because they
change value with heat, as during soldering! Carbon -film ( "low noise ") resistors are recommended for use in the
SSB audio phase shifters.
There is an RC pair associated with
each noninverting input (for example
R59/C50). The RC value (ohms, farads) of this pair must satisfy the relationf90 = /(2TrRC), where f9O is the
frequency (in hertz) and the output of
a section is shifted 90° in phase from
its input. The value
for each section is given on the schematic. You
-
1
can use a digital capacitance meter to
measure the capacitors, and a digital
ohmmeter to match a series resistor
combination to obtain the desired RC
product. If you depart from the suggested values on the schematic, keep
resistors in the range of ki2 to l00
kit, and keep capacitors above 0.001
ALF. Do not use ceramic capacitors as
they are unstable with temperature.
If accurate resistance and capacitance measuring devices are not available, there is another method, which
requires accurate frequency- and voltage- measuring devices, and a sine wave audio source. The sine -wave
generator should have a low output
impedance (50 ohms or less). If the
generator does not have a low output
impedance or if it is unknown, temporarily connect one of the op amp sections as a voltage follower and use it to
buffer the output of the signal generator. For each section, temporarily disconnect the inverting input resistor
(for example, R65) and disconnect
the ground lead of the capacitor (for
example, C50). Apply a sine wave at
f90 at about volt rms. Make an accurate measurement of the ac signal
voltage at the output of the allpass
section op amp. Reconnect the capacitor ground lead and adjust the resistor (for example, R59) such that the
ac voltage at the op amp output drops
to 70.71% of its original value. If the
initial voltage is 1.000 volt, it should
drop to 0.707 volt when the capacitor
lead is grounded. After the resistor is
adjusted, reconnect the capacitor lead
to ground and reconnect the inverting
input resistor. Repeat the process for
the other five sections.
The PLL dynamics are dependent
on the vco sensitivity (output frequency change divided by input voltage
1
change), which, in turn, is dependent
on varactor D6 characteristics. The
varactor specified (MV2115) has a
capacitance of 100 pF at 4 volts across
the diode. If you use this varactor, the
vco should tune 455 kHz plus or minus approximately 15 kHz over a -5to -+5 -volt range. The average vco
sensitivity is 2.7 kHz per volt. If you
use a different varactor, measure the
vco frequency versus voltage characteristic and determine the vco sensitivity (kHz /volt), and call this value
"X ". If X is not 2.7 kHz /volt, multiply the values of the resistances of
R28 and R31 by X/2.7.
Phase detector 1C8 (74C932) may
be hard to obtain. The 74C932 is the
phase detector part of the commonly
available CD4046 CMOS PLL. The
CD4046 may be substituted if the pin
connections are rearranged according
to the following:
Function 74C932
pin#
VDD
I
Vss
VCO IN
Limiter In
Output
VCO Inhibit
(connect to
V
CD4046
pin#
8
16
4
8
3
3
6
14
13
5
5
)
All other C134046 pine remain unconnected.
If the unit specified for LDRI cannot be obtained, use a red LED and a
cadmium sulphide photocell. Use a
photocell having 500 ohms or less
resistance at 20 mA of LED current.
Then optically seal the pair in a small
piece of "heat- shrink" tubing.
1
itiRETUNE LAST if
AFTER ADDING
CAPACITIVE TAP
LAST IF STAGE
TO
AUDIO
S
OSTEA
OR
ci
SUGGESTED VALUES FOR CI,C2
SOLID STATE SET CI -iSpF
-
ADDFO
COMPONENTS
SET
I
IF
C2 -1OOpF
TUBE
I
SMPLE
CI-50
C2 -27OpF
1
off
70
L
_
-_J
Fig. 5. The signal sample should be taken
after the last i -f stage with a capacitive
circuit added as shown here.
POPULAR ELECTRONICS
interfering carrier, or introduce an
interfering carrier from a r -f signal
generator. Place sideband selector
switch (52) in the position (USB or
LSB) which most attenuates the interfering carrier. Alternately adjust
Q- channel gain R25 and I -Phase adjust L2 for maximum interference attenuation.
To align the 10 -kHz notch filter,
tune in a station having an adjacent
channel interference (10-kHz beat
note). If the selectivity of your receiver is too narrow, you will not be able
to detect 10 kHz and the notch filter
will be unnecessary. But if your
receiver does have sufficient bandwidth, alternately adjust R40 and
R42 for maximum rejection of the 10kHz beat note.
I and O waveforms at pins
(top) and 15 (bottom) of IC2.
Fig. 6. The
14
Receiver Interfacing. Most receivers will work well with the synchronous detector. The only requirement
is that the local oscillator (LO) does
not have spurious FM modulation. To
test for this, tune in the receiver's
local oscillator on a general- coverage
receiver, using the bfo. If a general coverage receiver is not available, use
a second AM radio for this test, using
a broadcast signal above MHz as the
"bfo." The audio note should be pure,
without warbling sounds or pitch variations which indicate spurious FM. If
you hear 60 -Hz or 120 -Hz FM, try
improving the receiver power -supply
filtering. If you are using a tube -type
receiver and notice 60 -Hz FM, replace the LO /converter tube. Some
tubes may have some heater-to -cathode coupling that, while not affecting
normal operation, will introduce a 60Hz FM component in the LO signal.
The synchronous detector requires
an input signal between 50 mV and 2
volts p -p unmodulated carrier. The
agc circuit in the detector will establish the correct operating level as long
as the input signal is in this range.
The input impedance of the synchronous detector is high enough (about
25 kfl) that it will not disturb most
circuits.
The signal sample for the synchronous detector should be taken from
the host receiver after all i -f filtering
and agc, which usually means at the
i -f strip output. In most receivers, a
capacitive tap across the primary of
the last i -f stage works well, as shown
in Fig. 5. The slight additional capacitance introduced by the divider may
necessitate realignment of the last i -f
transformer. If signal levels are too
1
APRIL 1982
Operation. In normal operation,
SIDEBAND SELECTOR switch S2 should
low for capacitive dividers, try connecting the synchronous detector input directly to the collector of the last
i -f stage. Again, it may be necessary
to retune the last i -f stage transformer
if it exists. If you intend to use your
receiver's audio amplifier with the
synchronous detector, disconnect the
volume control from the envelope detector. Do not disable the envelope
detector entirely, as it usually provides agc. Route the audio signal from
the synchronous detector back into
the volume control, or into an external
amplifier.
If your receiver is ac- operated and
has no power transformer, be sure to
use an isolation transformer to avoid
shock hazard.
Adjustment. After interfacing the
receiver to the synchronous detector,
place mode switch SI in the TUNE
position and tune in a station. If the i -f
signal level is above the 50 mV p -p
minimum, pin
of 105 should be
between -4.5 and +4.5 volts. Tune
L1 for the most negative voltage at
this pin. Adjust L3 until tuning meter
MI indicates correct center -channel
tuning. The PLL should now be
locked, and the LOCK LED should illuminate. Adjust L2 for maximum dc
voltage at pin of 1C4. As there is
also audio present at pin 1, use of a
conventional mechanical- movement
voltmeter (instead of a digital meter)
will avoid confusing readings. This is
a coarse adjustment of L2. The I and
Q channel detector waveforms, at pins
14 and 15 of 1C2, are shown in
1
1
Fig. 6.
To adjust the SSB detection circuits, tune in a station which has an
be set to DSB and MODE switch Si to
TUNE. Tune the radio as you normally
would, but with the aid of tuning
meter MI. Keep in mind that when
the receiver is being tuned, envelope
detection is selected, and the LOCK
LED will be dark. If the station is fading badly enough that the LOCK LED
occasionally goes out, set the MODE
switch to the HOLD position. The PLL
will then track the received signal
through deep fades. The ENV position
of the MODE switch selects envelope
detection, which can be used for comparison with synchronous detection.
When adjacent channel interference, TV receiver horizontal sweep
harmonics, interfering carriers, etc.,
are present, selection of the USB or
LSB mode may provide a significant
reduction of the interference, since
these types of interference usually affect only one sideband of the AM signal. By receiving the unaffected sideband, an otherwise unlistenable signal
can be made usable. For interference
which affects both sidebands equally,
such as atmospheric or impulse noise,
DSB reception is best. (SSB reception
rejects half the power of a DSB signal.)
The SSB modes can also provide
improved frequency response on narrowband receivers. By tuning off to
one side of the station and selecting
the appropriate sideband, the frequency response can be significantly
improved. (Although detuning can
improve frequency response of conventional radios, it will also introduce
large amounts of distortion because of
envelope detection. Synchronous detection eliminates the distortion
caused by detuning.)
71
EQUIPMENT AND TRAINING
NO OTHER SCHOOL CAN MATCH.
NTS HOME TRAINING INVITES YOU TO EXPLORE MICROCOMPUTERS,
DIGITAL SYSTEMS AND MORE, WITH STATE -OF- THE -ART EQUIPMENT
YOU ASSEMBLE AND KEEP
Without question, microcomputers are the
state of the art in electronics. And NTS is the
only home study school that enables you to
train for this booming field by working with
your own production -model microcomputer.
We'll explain the principles of troubleshooting and testing your microcomputer and,
best of all, we'll show you how to
program it to do what you want.
You'll use a digital multimeter,
digital logic probe and other
sophisticated testing
gear to learn how to
localize problems
and solve
Send for the full color catalog in the electronics area of your choice -discover all the
advantages of home study with NTS!
NTS also offers courses in Auto Mechanics,
Air Conditioning and Home Appliances. Check
card for more information.
1.
a
them.
We
believe
that training
on production model equipment,
rather than home -made learning devices,
makes home study more exciting and relevant. That's why you'll find such gear in most
of NTS's electronics programs.
For instance, to learn Color TV Servicing
you'll build and keep the 25 -inch (diagonal)
NTS /HEATH digital color TV.
In Communications Electronics you'll be
able to assemble and keep your own
NTS /HEATH 2 -meter FM transceiver, plus test
equipment.
But no matter which program you choose,
NTS's Project Method of instruction helps you
quickly to acquire practical know -how.
72
POPULAR ELECTRONICS
Simulated
TV
Reception
4.
NATIONAL
TECHNICAL
N
T5 Trauung
Programs
and
IndusConsumer
tnal Elect-onlcs
01.5- SCHOOLS
TECHNICAL -TRADE TRAINING SINCE 1905
Resident and Home -Study Schools
4000 S0. FIGUEROA ST.. LOS ANGELES. CA. 90037
1.
The fTS /Rockwell AIM 65
Microcomputer A single board unit
with on -board 20 column alphanumeric
priiter and 20 character display. A 6502 -based
unit 4K RAM, expandable. 2. The NTS/KIM -1
Microcomputer A single board unit with 6 digit
LED display and on -board 24 key hexadecimal
calculator-type keyboard. A 6502 based
microcomputer with 1K RAM, expandable.
3. The NTS /HEATH H -89 Microcomputer
features floppy disk storage, "smart"
video terminal, two Z80 micro-
processors, 16K RAM memory, expandable to 48K. 4. The NTS/HEATH GR2001 Digital Color TV (25" diagonal)
features specialized AGC -SYNC muting,
filtered color and new solid -state high
voltage tripler rectifier.
APRIL 1982
r
NATIONAL TECHNICAL SCHOOLS
Dept 205,04.
4000 South Figueroa Street.
Los Angeles. California 90037
Please rush FREE color catalog on course checked below
Auto Mechanics
MicroComputers /MicroProcessors
Air Conditioning
Communications Electronics
I-ome Appliances
Digital Electronics
Color TV Servicing
-- Industrial Technology
-
Age
Name
Address
City
Apt.
State
'
I
-
Zip
Check if interested in G.I. information.
Check if interested ONLY in classroom training In Los Angeles
.1
75
CHARGE TWO CAR
BAITERIES AT
Speed charging
time of batteries by doubling up on the circuit
BY CHARLES COHN
CHARGING two or more lead acid batteries with one battery
charger, while keeping them isolated
circuit senses the battery voltage. If
that voltage is below a preset point
(e.g. 13.4 volts), the circuit turns on
the SCR. The SCR, in turn, passes
current to the battery. When the battery is fully charged, its voltage rises
above the preset point and the SCR is
not gated on. Recall that the gate of
an SCR can turn it on but cannot turn
it off. However, SCR turnoff is guaranteed in this circuit because of the
absence of a filter capacitor following
the rectifier. Without filtering, the
rectifier output drops to zero every
half cycle, turning off the SCR. When
self- discharge, electrolyte diffusion,
or loading pulls the battery voltage
below the preset point, the charger
turns on again
long enough to
bring the voltage back up. Thus, the
battery floats at full charge.
from each other, can be a snap with
the simple circuit modification described here. One of its uses is for
recreational vehicles that have a main
battery for starting and ignition and
an auxiliary battery for accessories.
These batteries are isolated from each
other so that overuse of accessories
while the engine is off will not run
down the starting battery and immobilize the vehicle.
Circuit Operation. Figure
shows
a simplified schematic of a commer1
cially available "automatic" battery
charger (the type that can be left permanently connected to a battery without danger of overcharging). A transformer and rectifier feed rectified ac
to the battery through a silicon controlled rectifier (SCR). A recreational vehicle usually has a power converter that charges the auxiliary battery
when line power is available. The converter works in much the same way as
the battery charger. However, in some
converters, the SCR anode is connected directly to one side of the power
transformer.
In the battery charger, the control
least equal to the maximum output of
the charger.
Connect the voltage sensing lead to
one of the batteries. It's best to connect it to the battery that is most likely to need charging, for example, the
auxiliary battery on a recreational vehicle. The other battery will follow. If
the second battery has a higher state
of charge than the controlled battery,
the diodes will steer the charging current away from it. If it is lower than
the controlled battery, the diodes will
steer the current into it. The charger
will not shut off until the controlled
battery comes to full charge. That
won't happen until the other battery
comes up enough to allow current to
be steered to the controlled battery.
Self-discharge will always bring the
controlled battery down enough to
turn on the charger.
If your recreational vehicle has a
solid -state battery isolator, you don't
need the diodes. Simply connect the
SCR cathode to the center terminal of
the isolator, the one to which the
alternator connects.
If you don't want to use individual
diodes, you can use a bridge rectifier
assembly with the appropriate current
rating, as shown in Fig. 3. Here, two
of the diodes are active, while the other two are in series opposing and do
nothing. This circuit has been used
with a Heathkit GP-21 10-A battery
charger installed in a camper van and
it works very well.
0
just
Construction. Figure
2 shows how
to modify the battery charger to
charge two batteries at once. Break
the connections between the SCR
cathode, the output, and the voltage
sensing lead. Connect a diode between
the SCR cathode and each battery,
with the diode cathode going to the
battery. You can use a lug terminal
strip to make connections. Select
diodes that have a current rating at
SCR
117VADII
VOLTAGE
SENSE
Simplified schematic of a typical
commercial "automatic" battery charger.
Fig.
1.
BATTERY
BRIDGE ASSEMBLY
(SEE TEXT)
t-
A
I
SCR
Fig. 2. Modification of the battery charger to
charge two batteries using individual diodes.
ADDED DIODES
(SEE TEXT)
VOLTAGE
SENSE
BATTERY
BATTERY
2
I
VOLTAGE
SENSE
BATTER
9 AT'
A
Fig. 3. The charger circuit can also be
modified by adding a bridge rectifier assembly.
76
POPULAR ELECTRONICS
78-RPM RECORDS
LV ACANi.
Easy- to-make turntable modifications allow you
t, play all your old collector records
BY RAYMOND BINTLFF
THE collector of 78 -rpm records is
faced with a problem when purchasing a new turntable. Only a few of
them provide 78 -rpm operation today:
inexpensive record changers or variable speed audiophile units priced beyond the
average pocketbook.
This problem can be solved by modify!ng an otherwise satisfactory two speed turntable. Belt- driven platters re-
quire a mechanical change, while direct drive designs need electrical modification. The mechanical approach requires
machine -shop facilities and precision
workmanship. But an electrical conversion is relatively simple and easily implemented, as presented here.
The Technics SL -Dl direct -drive
turntable is used as an example of how
such a unit may easily be converted to
Net Lksaámi kg
_
"
78 -rpm operation. (The same change
can be made to the Technics SL -D2,
SL -D3 and SL -D5.) To keep the conversion simple, that portion of the speed
control circuit used for 45 -rpm operation was modified. This approach sacrifices the 45 -rpm capability but avoids
the addition of a switch and subsequent
defacement of the turntable chassis.
A brief look at how the Technics SL-
Ralta tras/east
E~
SHE'S MY CURLY-HEAt7EI
Dtck Hartman's Tennessee R3mFtyrs
Stneuna with RoItars
8 5891 8
78-rpm records
Q,
2SC1846
STOP SWITCH
Q
KC.
N.
SI
D1
SVDS1 RBA20
R5 33
POWER
TRANSFORMER
T
02
DI
2S D637
BLU
Q2
8V
\
L___
BLU
r
RI
3.?tI*
117.3V1
[22.8V1
[I6.6V1
14.6V]
[5.91
15.9V1
122.8V1
119.4V1
14.6V1
16.4V1
16.4V1
12.7V)
ICI
A N630U
1
03
L
D2
[17.4V1
pz4V1 13.2v1
12.7V1
(3.4v1
[21.5V1
[2L5v1
10.9VI
111.4V
12.0V)
12.7V1
120.5V)
(20.5V)
13.2V1
J2SB641
í
18.3v
18.3V
815 22K
119 9V1
Q3'190V
D6
4o
h
D6
MA150
=
78
SPEED SELECTOR
SWITCH
Fig.
1.
S2
Portion of speed- control circuit of the SL -D
I
with new 56- kilohm resistor added for 78 rpm.
Dl direct -drive turntable operates
shows why a simple modification can be
effected. There are two sets of coils
within the turntable platter assembly.
One set applies torque to the platter,
while another set generates a position
signal with a frequency directly related
to platter speed.
The position signal is compared to a
reference frequency by a custom IC
within the turntable chassis. Current to
the drive coils is automatically adjusted
Fig. 2. Detail of pc board with addition of new resistor.
78
until the reference frequency and the
position signal "lock" together. A dc
feedback path external to the IC is part
of the circuit that determines the reference frequency. Different resistances
are switched in and out of this feedback
path, providing the desired two -speed
turntable operation.
The schematic in Fig. l shows the SLD I speed- control circuit, including the
additional 56- kilohm resistor which permits turntable operation at 78 rpm. Both
S2 and VR3 are front -panel controls.
Switch S2 is the SPEED selector and
potentiometer VR3 is the PITCH ADJUSTMENT. Potentiometers VRI and VR2 are
POPULAR ELECTRONICS
screwdriver adjustments that trim turntable speed. They are located under the
turntable platter. To obtain operation at
78 rpm, a 56- kilohm resistor is added in
parallel with R7. The position of R7 is
clearly marked on the SL -DI's printed
circuit board.
Prepare the turntable for modification
by making certain that its line cord is
disconnected. Then lock the tonearm in
place with the arm clamp and remove
the mat and turntable platter. With the
dust cover in place, carefully invert the
unit. Use cloth or newspapers to protect
the dust cover from scratches.
(Place a small piece of masking tape on
the rim of the platter as a counting aid).
Turn VR2 counterclockwise until an approximate speed of 78 rpm is obtained.
(When the turntable is fully assembled,
VR2 is accessible through either of the
two holes in the platter).
With the speed approximately set,
place a stroboscope disc on the turntable
and adjust VR2 for exactly 78 rpm.
Now place the SPEED switch at "33" and
adjust VRI (again use platter access
holes) for correct speed (marks on the
turntable rim serve as a strobe). Replace
the mat, and the turntable unit is ready
WE'LL LURE YOU
WITH OUR PRICES...
AND WIN YOU
WITH OUR
ORDER
TOLL FREE
1800)
SERVICE
221 -8180
In New York
THIS MONTH'S
SUPER SPECIALS
VIDEO & AUDIO
7328600
1212)
SONY MDR 3 MICRO
HEADPHONES
SUPER LIGHTWEIGHT
ME,
PANASONICIN-1270
KA
HI-M
TECHNICS SA.222 IVrce,verl
TECHNICS SL8202 )rUrntaOle,
TEAC 0580 (CaSS Deck)
PIONEER MI amplifier,
SONY TCD.SM (Port Stereo Cass,
SONY Kí2001
Port AM ,F1.9 SW 558,
559
949
VHS,
RCA VF7450M49
SONY 542000 Port Beta,
875
soon TT.2000(tunerlT,men,
SONY a.50001Bet)
275
639
TECHNICS
Shipped 5FFRlOIIt CCMe[t
VIDEO CAMERAS
AKIN VCX1 Auto MT (re
$1449
$959
$649
WC-220)16
SONY
00088A W.190018) zoom
S11URE
OAKEN
VIDICRAFTPROC-AMP
SIn1RE
HEADPHONES
455
10-21455 I2í Remote)
ALL COLOR TELEN510N5
PKD®1NE2300
PKM1®lKEX-20
MOWN IUE5100iaock)
PANASOIKCpS900 )ClecK
screwdriver through
access holes
underneath the
turntable platter.
A
IMMBIRFS38
JB19p1RF512
MABANt2 CAR-427
PANASONIC 9Á11820
6x94 -Way)
RADAR DETECTORS
MX MC
$99.
PDX SUPMEFOE
p
IVmIB7M 15uperhen
109.
át19.
s1
99.90 PAIR
09.90- PAIR
79.90- PAIR
73.90 PAIR
104.90
-
re,
1
$245
ONLY
COMPUTERS
CALCULATORS
f
CANON LC417 ICLOCk Cap
CANON P-70 Awn Printen
SHARP 0.107151DESk Pinte
SHARP 88081 )Palm Printe
715100 Desk Calr
71.5135 Desk Printen
21.90
53.90
58.90
27.90
43.90
68.90
98.90
45.90
78.90
26.90
I
T45142(ponter VIS,)
Ti Bus
Mal.
A )BUS
Calo
/
!enrol,
E-1433U P.ir,
HP-33c
PAIR
COMMODORE U 20
HOME COMPUTER
'111111111 ®
APRIL 1982
S4.90 /PAR
PRICED TOO LOW TO ADVERTISE
CALL FOR LOWEST PRICE
ALL MODELS AVAILABLE
WE WILL MATCH OR BEAT ANY PRICE
$199.
$99.
1:
remembered that the manufacturer's
warranty does not apply to user -modified products.
0
53.90)PA)R
SON0 BLAUPUNKT CONCORD
MITSUBISHI AUDIOVOX CRAK:
239.
gAFaU51@ KITE
for use. The unit will "spin -up" to 78
rpm in just under three revolutions.
The turntable must be shut off when
adjustment is made to VRI or VR2. Do
not leave the power on and stop the platter by hand to make these speed adjustments. Correct speed adjustment is a
trial- and -error process. Potentiometers
VRI and VR2 can also be adjusted from
beneath the unit when the bottom cover
is removed.
If correct speed cannot be obtained
within the range of either VRI or VR2,
a slight offset from midpoint may be
necessary for VR3. Returning the turntable to 33 rpm /45 rpm operation is easily accomplished by removing the 56kilohm resistor and readjusting VRI
and VR2.
A modified SL -D1 turntable has been
operated satisfactorily by the author for
one year. To date, there has been no evidence of excessive heat dissipation or
mechanical wear. However, it should be
99.90 PAIR
44.90/PAW
69.90 )PAIR
181001 2-2033 ,6x9 7/13x III
JENSEN1 -1069 )679 Coax)
139.90 IENSER.1 -1065 16x9 T,Mm)
174.90 JENSEN 2 -2126 )4' r Coaxm
214.90 1095011 -2041 IS' CO. i)
209.90 0050W 13896 6x9 3 wad)
a. 327.90 PIONEER TS695 )6x9 trod
279.90 PIONEER TS-189 6 3 -way)
249.90 PONEER 75116 0-way 110,1
209.90
259.90
CLARMJN7500 'PB AR)
24.90
44.90
59.90
CAR SPEAKERS
CAR STEREO
Pq1®I KP8500
23.90
ter.,
SONY MDR -50T !MCro,
SONY MDR -90T ¡Moro,
8Y-0ASH CASSETTE WON RADIO
10050 Reverse
100.90
SANYOFTC26
,
'129
'149
109.95
99.90
' 4
RSONEERSE6.3
719 KOSS KW
SHIPPED FREIGHT COLLECT
Now remove the seven screws which
retain the isolators (bottom feet) and
the bottom cover. (The front and rear
isolators use different springs. During
reassembly be certain to install the isolators in their correct positions.) Detach
the bottom cover and four isolators.
Next, locate resistor R7 on the printed
circuit board (Fig. 2) and solder a 56kilohm resistor in parallel with it. Do not
use excessive heat.
Finally, replace the bottom cover and
isolators, install the seven mounting
screws, and return the unit to its upright
position. Speed adjustments must now
be performed before the modified turntable is ready for use.
First, turn VR2 to the maximum
clockwise position (Fig. 3) and replace
the turntable platter. Then plug in the
line cord and place the turntable's SPEED
switch in the "45" position. Reidentify
this position as "78" with Presstype
numerics and set VR3 at its midposition.
Now turn on the unit and count the
number of revolutions per minute.
STEREO-TO-CA
1
NOTE
'8
'5
M9107
5;;
COLOR T.V.
SONY
h
)
015 TYPe N
SOLO ICaSS) FM Stereo/
NINA CS/1 Kass I FM stereo'Rec
SONY Walkman E Ca, Stereo)
TOSIEA KTS1,Cass Stereo,
SONY Walkman
COOS Stereo,
SONY KV-1914119 Screen)
1224
115
)
59.95
234.90
SONY KV-1515I15 Screen)
SONY KV -1746M )1I Remote)
'265
'349
'469
LIURE M95EED
'105
'195 K04
I
VIDKRARSTAEJ2E
'
SHURE 619711E
VIDEO ACCESSORIES
VIDICRAFT
WDKRAFT DOTASSI
1209
CARTRIDGES
16:3
rner
19TACMV C-1000 atubee55,
Fig. 3. Potentiometers
VR / and VR2 can be
adjusted with a
23.90EACH
ONLY
VIDEO RECORDERS
S1099
JVC E -7650 New VHS/
PANASONIC
ATAS 400 IBaSK COmputerI
ATARI 800 IDeluxe Computen
ATASE 61101060 Drivel
ATAM8251prinren
355
655
445
EPSON Mx801Pr)nten
Ti PH0004 AlomeComputen
Ti PHP -1900
379
298
369
give)
7111141,19S0
BLANK CASSETTES
MAXELL HOT -120 OK TDK HOT -120
VIDEO TAPE
NCr
9a
ONLY
AUDIO 1: Awlo
mar
T°RnP°EEZI
2. 73
2 .g9
PrO I,IIOr111G90
WA EEXXIOrIIC90
SCOTOI HlghOnderC903Pak
SCOTCII
SCOTp M9Ster II C90 2-Pak
H18M5C-90.
..
SONY INK C,90
SONY FeCr C90
995
MK MAC80tMetall
UDXIIOrUDXLIIC80
MAXML UOXIIorUDXLIIC.90
MAXMLL
MAXIM OD35- 0
MAXELL WOM110 (Wand Derma;
HE-44 (Cassette Oemag
ADDITIONAL 5% DISCOUNT ON
100 OR MORE ASSORTED TAPES
I
COLOR
TV3,
I
27.50
24.50
12.95
MEMOREX 0.120
S1
1399
49 MAXIM 0.120
3..29 ZENITH 1.830 14.4E TDK 7-120 14A9
2.49 AMPEX T52012.95 AMPEX L 5009.95
7120...13.95
F04
L500
10.49
99
FUJI
5.
9.95
9. 95 BASEL-3001 Pure Chromium)
13.95
16. 9$ BASF L-1201Pure Chromium)
A
TDK SAX C-90
KW
I05
ATARI
2.95 ATARI SPACE INVADERS
TCK 56 C90
WE STOCK
10.95
12.95
14.95
239.95
24.30
144.95
16. 99 ATARI Video Game 012600
ALL ATARI GAME CARTRIDGES
1. 25
AVARABLES
T0 00O11Head Demagnetizer,
TDK DCBD
TDK DC90
TOR AO CIO
MUM
EACH
T
2.
3. 25 ALL BETA 4500
4. 49 ALL ETA1.7S0
2. 99 ALL V16T.1201EXCeptnC
1. 59 MATTEL IntelivlSlon Game
2. 79 ALL MATTEL GPM CARTRIDGES
Master)C90
MMAORMX
17.50
.50
S BY AMPEX. BASF
WE CARRY VIDEO
FUJI IOC MAXELL, MEMOREX PANASONIC
RCA SCOTCH SONY 6 SDK
775
SCOTCH
VH3Head Cleaner,
9.90e00ulk Eraser,
,ORTROIECS
17.99
34.99
VHS AND BETA VIDEO RECORDERS AND HOME
MOVIES
FROM ALL MAJOR HOLLYWOOD STUDIOS. SEND FOR FREE CATALOC
WE WILL
MET
OR
EAT
API./ COMPETITORS PRICE IF HE HAS THE MDSE. ON HARD
FOR PROMPT AND COURTEOUS SHIPMENT SEND
NOW TO ORDE MT MAL
MONEY ORDER. CERTIFIED CHECK CASHIERS CHECK. MASTERCARD )VISA 1150102e carol
number interbank no expiration date and signature, DO NOT SND CA94.
PERSONAL AND BUSINESS CHECKS MUST CLEAR OUR BANK BEFORE PROCESSING
SHIPPING HANDLING 6 INSURANCE CHARGE IS 5% OF TOTAL ORDER WRH A $4.95
MINIMUM (Snipping charge t0 Canada Alaska Hawaii 5 Puerto Rico is 1095 with 9 95
m NEW YORK STATE RESIDENTS ADD SALES TAX
mALI. mERCNANDISE N BRAND NEW
FACTORY FRESH AND 100% GUARANTEED.
23 PARK ROW,DEPT.PE4 N YC 10038
SEND FOR FREE 280 PAGE AUDIO/VIDEO CATALOG
CIRCLE NO 30 ON FREE INFORMATION CARD
79
BJLD A
RES STA\CE-CARAOTA\CE
SUBSTITUTION BOX
Provides resistances from 0.5 ohm to 20 megohms and
capacitances from 5000 pF to 2 ,uF
BY CASS LEWART
THE resistance -capacitance substitution box is a simple, yet useful, piece of test equipment. It provides a wide range of resistance and
capacitance values that you can select
quickly and easily.
The substitution box described here
multi -position rotary
uses
two
switch, S2, is used to connect the two
sets of resistors /capacitors in series or
parallel, or select the first set alone.
Depending on the positions of the two
switches, you can select thirty -three
resistor /capacitor values or an open
circuit.
switches and 22 resistors and capacitors. It substitutes for a wide range of
resistors, from 1/2 12 to 20 MS-2, and
capacitors, from 5000 pF to 2 MF. A
S2, 10 S2,
12- position switch selects
100 S2, kS2, 10 k12, 100 kit, MO, 10
MS2, 0.01 ALF, 0.1 MF, 1.0 MF, or an
open circuit. A 3- position switch multiplies the reading on the 12- position
switch by 1/2, or 2. For finer resolution you can build two of these boxes
and connect them together. Also, you
can use two boxes to substitute for
components in series or parallel RC
networks.
Construction. Multiple- section ro-
1
1
1
facilitate mounting of components directly on the switch, disassemble SI
and turn sections SIB and SID by
180 degrees. By doing this, the two
sets of capacitors and resistors can be
mounted on opposite sides of the
switch providing for a neat layout.
Both switches should be wired before
being mounted in the cabinet. Select
proper wattage and voltage ratings for
all components depending on the intended use for the substitution box.
Use only nonpolarized capacitors. Use
a plastic cabinet or an insulated metal
box to protect yourself against shocks
from short circuits.
tary switches are generally available
from industrial distributors and many
surplus suppliers. Set switch SI for 12
positions by removing the index pointer. Set the pointer on switch S2 for 3
positions. Mount all components on a
small board or directly on Sl. To
SIA
1
Circuit Operation. Figure
1
is a
schematic of the circuit. One set of
eight resistors and three capacitors is
connected between sections SIA and
SIC of the 12- position switch, SI. A
second identical set of components is
between SIB and SID. The 3- position
ION
IM
Schematic of
circuit shows how a set of
eight resistors and three
capacitors is used to
provide a wide range
of substitution values.
Fig.
1.
In
0.014F 0.15F I4F
/
10(1
100!1 IK
10K
IOOK
1
f
CIL 5L C_61.
SIC
SIB
C
R9
}RIO
IRII
1R12 1R13 1R14 1R15
R16
SIO
ÎY
t
o
S2B
:2(R)
K2 (R) XI
-21C)
x21C1
OUTPUT
(SERIES)IPARALLEL)
PARTS LIST
1,C4- 0.01 -µF capacitor
C2,C5- 0.1 -µF capacitor
C3,C6- 1.0 -µF capacitor
C
-1
R1,R9
-S2 resistor
R2,R 10 -10-52 resistor
R3,R 11- 100 -52 resistor
R4,R 12
-kS2 resistor
R5,R 13- 10 -kS2 resistor
R6,R 14- 100 -kO2 resistor
R7,R15
-MS2 resistor
-1
-1
R8,R16- 10 -MS2 resistor
-1
-pole per section, 4- section, 2-12 position rotary switch (OAK G- 725550 or
equivalent)
S2
-pole, 1-section, 2 -6- position rotary
switch, (OAK G- 725551 -2 or equivaS
1
-2
lent).
80
POPULAR ELECTRONICS
ELIMINATE DATA LOSS
\ YO.,? TRS-80 COVPTHR
A simple circuit addition, usable with any microcomputer,
will help prevent outages due to line disturbances
BY ROBERT E. WILSON
THE WORST computer head-
arrestor, and a pair of
power outlets to the video monitor for
less than $8. The complete circuit,
shown in Fig. 1, complements the fuse
and switch already in the video monitor. Power switch S/0/ is rated at
5 A (600 W), and the fuse F101 is
A
(120 W).
A Level II 16K -byte system requires 93 W total, including the cassette player. Replacing fuse F101
with a 2 -A type provides up to 240 W,
with no change in safety. Adding the
filter and varistor provides two stages
of protection for the computer.
Although opening the video monitor
cabinet will void the warranty, the
modification does not affect monitor
operation in any way. The filter surge
arrestor fits into an empty space, well
away from any critical signal areas,
and produces no heat. The video monitor cabinet back remains completely
removable for servicing.
1
Modification. The changes needed
are straightforward and are most easily performed in three stages.
AC
F103
LINE
F101
5A
1A
WHITE /BLACK
i
y
T
11
1- Varistor diode
V130LA10A)
M l -R -f interference
22},F
POWER
WHITE
I
c1o4
630
R104
CR101
EXISTING CIRCUITRY
ADDED COMPONENTS
(GE
MOV
r
Series
filter, 250-W (Radio
Shack 15 -1106)
SO 1,SO2- Chassis -mount socket (Radio
Shack 270 -642)
Misc.- Twin -lead lamp cord (12 "), Styrene
cement (modeler's glue)
APRIL 1982
\
5101
crol
PARTS LIST
D
First, cut around the bottom panel
of the filter with a sharp knife to
break the glue line and expose the
interior components. Unsolder the input power cord and plug, and set aside
for later use. Solder about 12 inches
of line cord to the same terminals,
then solder the varistor to the terminal pins of the output (socket) connector. At this point, the filter assembly should look like Fig. 2. Fit the new
line cord through the slot in the plastic (styrene) enclosure, and glue the
bottom panel back in place. Any general- purpose cement will do, but the
type used for building plastic models
is ideal for styrene.
Next, remove the five screws securing the back panel of the video monitor (there is no seal, such as is on the
keyboard unit) with a 114 -in. socket
wrench, and lift off the panel. As
shown in Fig. 3, the new power outlets
will be located on the left -hand side
(looking from the inside) of the rear
panel about 4 to 6 inches up from the
bottom. This is an empty area within
the monitor, and the exact location is
a varistor surge
aches typically involve an unexpected breakdown or random bit errors with no apparent cause. An
examination of the hardware may reveal one or more inoperative ICs. It
may also show that everything is in
good working order; but some (though
not all) of the time, data does not flow
properly between the system and the
cassette or disk.
In most cases, damaged ICs are the
result of very high voltage spikes
(from air conditioner, refrigerator, or
washing machine motors, for example) on the power line. And data flow
can be disturbed by electrical "hash"
from nearby fluorescent lamps or
light dimmers -also coupled through
the power line.
If you have had either of these problems or if you want to avoid them, you
should add a power line filter /surge
arrester to your system. Although designed for the TRS -80, the approach
described here can be used with any
other microcomputer system.
In the case of the TRS -80, extra
outlets are added to the video monitor
for the keyboard power supply and
cassette player so that only one power
cord (the one from the monitor) needs
to be plugged into the wall outlet. Triple taps and extension cords aren't
needed when this modification is
made. The video monitor power
switch controls the entire system; the
keyboard power switch (beside the
cable entrance) will no longer be
needed; and there will be no idling
currents in either the cassette player
or keyboard power transformers.
The modification adds an r -f filter,
,
.--
AC FILTER
VARISTOR
AC OUTLETS
SOI
MI
b
0-0-0
SO2
DI
T
L
ARCHER
15 -1106
j
GE MOV
ARCHER
VI3OLAIOA
270 -642
Fig. 1. Schematic of the circuit to be added
to the fuse and switch already in the video monitor.
81
data loss
not critical. Mark and cut the holes
for the outlets. This is most easily
done by first drilling a series of small
holes around a marked line, then
trimming the hole to proper size and
shape using a sharp knife. Mount the
outlets with suitable hardware, wire
Fig. 2. The opened filter with new line cord attached.
Ili'
I
II
I
IIIII
.,,-+F+,.
Fig. 3. Inside of the back panel with new power outlets.
them together in parallel, then attach
the cord and plug that was salvaged
from the original filter. At this point,
the back panel assembly should look
like Fig. 3. The final step is to type a
paper label saying:
SWITCHED POWER
80 WATTS MAX
and lacquer it onto the outside of the
panel near the new outlets.
The last step is to install the modified filter in the video monitor. With
the cabinet back off, the main chassis
printed circuit board will slide out a
few inches to make tracing of the wire
easier. Follow along from the power
cord through the fuse(s), to a white
wire with black stripe, that goes up to
the power switch, and finally to a solid
white wire that returns from the power switch to a terminal strip at the
front of the circuit board.
Solder one of the filter power inlet
leads to this terminal, and solder the
other lead to the center terminal on
the same strip that extends down to
the chassis plate. Slide the chassis
back into the cabinet. Glue the filter
assembly to the side of the monitor
cabinet while sliding it down against
the bottom of the cabinet for extra
support, as shown in Fig. 4.
This mounting position is out of the
way, yet sturdy enough to take any
abuse that the cabinet as a whole can
take. After the glue has set, the new
outlet cord from the back panel sockets can be plugged into the filter outlet, and the back panel reinstalled on
the monitor cabinet, completing the
modification.
Plug the keyboard power supply
and the cassette player into the new
outlets on the back of the video monitor, and plug the video monitor line
cord into a wall outlet. Turn on the
keyboard power switch near the cable
entrance at the back and forget
you won't need it again. Now turn on
the monitor. After a short warm -up
delay, the beginning messages should
appear on the monitor, and the system
is off and running.
To test the new filter's effectiveness, a particularly noisy fluorescent
desk lamp was plugged into the same
wall outlet as the computer, and
switched on and off repeatedly during
a CLOAD. Although flickering appeared all over the monitor screen, the
0
computer never dropped a bit.
it-
Fig. 4. Glue the filter to the lower inside wall o, the cabinet.
82
POPULAR ELECTRONICS
APRIL SPECIAL
Communications Corp.,
1708 Stierlin Rd., Mountain View, CA
94043 (Tel: 415- 969- 6086).
dress:
OMPUTCR
SOURCES
By Leslie Solomon
Technical Director
Hardware
Heath Sound Effects. The PSGx2
uses two GI AY3 -8910 Programmable
Sound Generator chips to produce a
wide variety of sound effects when
plugged into P504/P505 of the H89
Echo
Memory Management. The Memory
Master 1.0 for the Apple II with Apple
DOS 3.3 provides 44K -bytes of storage
within the 48K on the Apple motherboard by relocating the DOS to any of
the four 16K banks on the 64KC card. It
also manage Integer /Applesoft
firmware, and can be used with any 16K
RAM card similar in function to the
Apple Language Card. An additional
8.5K of RAM is released on the Apple
motherboard, each disk CATALOG
displays unused sectors on diskette, machine- language programs can access the
DOS RWTS routines through standard
DOS page 3 vectors ($3D0 through
#3EC) and no additional page-3 space is
used. The .FLIP command allows user
to flip between DOS 3.3 and 3.2 without
rebooting, the .STAT command displays DOS version in use, and the
.BSTAT command displays the hex
starting address and length of last binary file either Bloaded or BR,UN. Address: Great Lakes Digital Resources,
POB 32133, Detroit, MI 48232 (Tel:
313 -538- 7963).
8-MHz CPU Card. The CP600 Central
Processor Card uses a 6 -MHz, Z80
CPU and conforms to the IEEE 696
Standard for S -100. Two on -board ports
extend memory addressing to 24 bits
and I/O addressing to 16 bits. This
allows 16 megabytes of RAM and 65K
of system I /O. RAM refresh is standard
S -100 memory read cycle, and all 8 lower address bits are used for refresh to
accommodate 64K RAM devices. A refresh localizer allows intensified parity
checking in the area of currently executing programs. All bus cycles are three
"T" times long, including refresh cycle.
A crystal -controlled clock, jumper selectable on -board memory and I/O
wait states, as well as an on -board
EPROM wait are provided. Ready signals are evaluated on rising edge of PHI
during BS2, per IEEE 696. $550. AdAPRIL 1982
MX -80
INTERFACES
IEEE
8
CABLES
$55
APPLE INTERFACE
8
CABLE
RS -232
$90.
$70,
TRS -80 CABLE $35.
will
SM -Byte
buss. The PSGx4 uses four similar chips
and plugs directly into the H8 buss.
Each board comes with a speaker, a
built -in audio monitor, and uses a crystal time base. PSGx2 is $125, PSGx4 is
$225. The MICRO -PIANO 2.0 software can play up to 6 -note polyphony
over an 8- octave range, and features a
graphic screen editor. $24.95. Address:
Mako Data Products, 1441 -B N. Red
Gum, Anaheim, CA 92806 (Tel: 714632- 8583).
$439.00
EPSON
System. The LS525 uses a
Seagate ST506 51/4 -inch Winchester
drive, LDOS, linear power supply, and
an LSI -500 Series controller. All TRS80 user programs currently running under TRSDOS or NEWDOS will run
under LDOS. A separate off-board Host
Adapter allows the LS525 to be cross connected to almost any CPU and bus.
Up to three additional Winchesters can
be added with no software modifications. Size is 13.5" deep, 12" wide, and
51/4" high. $3750. Address: Laredo Systems Inc., 2264 Calle de Luna, Santa
Clara, CA 95050 (Tel: 408 -980 -1888).
PC -8001 Expansion. The PC -Multi
Card replaces the PC -8012A Modular
Expansion Unit to provide disk I/O and
an additional 32K of RAM. While providing 64K of RAM for CP /M, a patch
is provided for another 8K of RAM
available to NBASIC in ROM. Power is
supplied from the PC-8001A. $375. Address: Astar International Co., 5676
Francis Ave., Chino, CA 91710 (Tel:
714 -627 -9887).
128K For Apple. The 128KDE Soft
Disk can be installed in any slot and can
be accessed via DOS 3.3 as if it were an
actual floppy disk. It is as much as 300%
faster than an Apple Disk II. The software supports up to three 128KDE
cards. By switching eight 16K banks
over the existing ROM space, the Soft
Disk triples the RAM capacity. $750.
Address: Great Lakes Digital Resources, Box 32 -133, Detroit, MI 48232
(Tel: 313 -538- 7963).
VIP Memory. The GJK 8K RAM card
allows expanding the RCA VIP computer to full (32K) capacity. Each 4K block
PERSONAL
COMPUTERS
NEC 7710 and 7730 Spinwriter
NEC 3510 and 3530 Spinwriter
NEC 3515 Spinwriter
NEC JB1201 M 12" Monitor
M & R Sup -R-Terminal
Okidata Microline -82A
Microsoft Soft Card (Z -80)
Diablo 630
Televideo 912C
Televideo 920C
Televideo 950
$2345.00
1750.00
1795.00
159.00
279.00
499.00
279.00
1995.00
669.00
.689.00
929.00
CBM 8032 Computer
1149.00
1349.00
CBM 8050 Disk Drive
CBM VIC -20
Amdek 100G
Amdek Color
269.00
169.00
339.00
2095.00
339.00
449.00
749.00
319.00
549.00
729.00
299.00
189.00
-
1
13" Monitor
Qume Sprint 9/45 (Full Panel)
Atari 400 16K
.
Atari 810 Disk Drive
Atari 800 16K
Epson MX -70
Epson MX -80 FT
Epson MX -100 FT
Hayes Micromodem
Sanyo 9"
B
II
(Apple II)
& W
CALL TOLL FREE!
EAST COAST
1- 800 -556 -7586
COMPUTER SHOPPING CENTER INC.
12 Meeting St.
Cumberland, RI 02864
1- 401 -722 -1027
TELEX 952106
WEST COAST
1- 800 -235 -3581
COMPUTER SHOPPING CENTER INC.
3533 Old Conejo Rd. #101
Newbury Park, CA 91320
1- 805-499 -3678
CA. TOLL FREE -800- 322 -1873
TELEX 182889
We Accept C.O.D.'s Stock Shipments Some Day
or Next No Surcharge for Credit Cards All
Equipment Factory Fresh w /MFT Warranty We
Carry the Complete Line of Personal Software
Prices do not Reflect Shipping Charges
Sales Tax Where Applicable
1
COMPUTER SHOPPING CENTER
PRICES ARE SUBJECT TO CHANGE
WITHOUT NOTICE
83
@-
Audio
Modules
1982
DISCOUNT
ELECTRONICS
CATALOG
MOSFET
Power
JOIN THE PAK!
Send for our Free catalog and become
a
Amplifiers
member o' our exclusive Pak. Our
members receive Poly Paks'
exciting catalog several
times
BUILTIN HEATSINKS ONLY
year. We offer:
a
REQUIRED
5
Premiums.and Low,
Low Prices on a wide variety of
Electronic Products such as Computer Periph-
ucts, Semiconductors, and much, much more!
CONNECTIONS
YEAR WARRANTY
<0.006 %.
4 1)
MOS12060WI4 -811 (requires ± 45V)
MOS200120WI4.80 (requires ± 55V)
MOS400240W140 (requires ± 55V)
Take advaitage of our 25 years as America's
foremost Supplier of discount electronics.
$79.95
$129.95
1199.95
WRITE FOR FREE CATALOGUE LISTING;
RUSH ME YOUR FREE DISCOUNTCATALOGI
BIPOLAR POWER AMPLIFIERS 'HIFI PREAMPS
MIXERS POWER SUPPLY UNITS 'CABINETS
'GUITAR PREAMP and more
NAME'
ADDRESE
GtLáGSTO111E
CITY
ZIP
Electronics 901 Fuhrmann Bled., Buffalo, NY, 14203
CALL (716) 849-0735 to order. Have your
VISA or MasterCard ready. For information
call (416) 787.1448 or circle reader number.
CLIP AND NAIL COUPON TODAY TO:
POLY PAKS, INC.
P.O. BOX 1142, P0-4
S. LYNNFIELD, MA. 01940
Dealer /OEM enquiries (416) 787 -1488
Canada: Gladstone Electronics. Toronto
(617) 245- 3926
CIRCLE 40. 40 ON FREE INFORMATION CARO
In
clocks. There is a full- screen editor and
it will handle Orchestra -80 files. Plugs
into any 16K TRS -80 Model I Level II
keyboard or expansion interface without
voiding warrantee. No external power
supply is required. $129.95 plus $2 shipping. Address: Software Affair, 858 Rubis Drive, Sunnyvale, CA 94087 (Tel:
408 -295- 9195).
Heath Disk Systems. The high -density Z -37 disk drive uses a pair of drives
to increase storage capacity to 1.3 million bytes (640,000 bytes per diskette)
by doubling the number of tracks and
using both sides of a diskette. Thus, 160
tracks are used versus 40 tracks in conventional drives. The drive can use
CP /M or HDOS. $1995. The doubledensity disk controller card Z -89 -37 increases the capacity of conventional
51/4" drives from 100K -bytes to 160Kbytes. It uses soft -sectored diskettes.
$395. Address: Zenith Data Systems,
1000 Milwaukee Ave., Glenview, IL
60025 (Tel: 312- 391 -8181).
CIRCLE NO 20 ON FREE INFORMATION CARD
Four-Drive Double- Density Disk Controller
for H Z-89 Includes Parallel Printer Port
$249.95
TRS-80 Music. Orchestra -85 features
music synthesis and percussion with
stereo separation by instrument. The
software supports five -part harmony for
use with 2.66, 3.54, and 4.0-MHz
-
Speakers, Audio
Equipment, Rechargeable Batteries, Solar Prod-
STATE:
separately addressable, and requires
600-mA from the 5 -volt line. Bare board
is $49, assembled is $149. Address: G.J.
Krizek, 722 N. Morada Ave., West
Covina, CA 91790.
is
Choose ILP MOSFET power amps when you need the utmost in performance without spending big money. They
provide the fastest possible slew rate, low distortion at
high frequencies, + better thermal stability. MOSFET
power amps work with complex loads without difficulty
and without crossover distortion. Three models are
available, with integral heatsink to mount on your own
chassis (optional rack mount cabinet available). Con.
nection is simple
via 5 pins. MOSFETs can be combined with other ILP modules to create almost any audio
system, whatever your age or experience.
Ultra -fi specifications: Slew rate 20Vus. Rise time 3 us.
SIN ratio 100 db. Frequency response (-3 db) 15 Hz - 100
kHz. THD (Typical at 1kHz) <0.005 %. IMO (50Hzl7kHz
Penny Sales, Free
erals, Integrated Circuits,
5
tromputPx
4
40- and 80 -Track Add -On Drives
for the H Z -89 and H -8
Software
from $399
Now! Percom Disk Storage for Your Heath Computer.
At Percom we've been making mini -disk systems since 1977.
Our proven disk controller design. featuring digital phase -lock loop data separation,
gives rock -solid performance.
Every Percom drive sold is double tested to Percom specifications.
And every drive receives a 48 -hour operating bum -in, a qc check that virtually
eliminates the possibility of shipping drives with latent defects.
Get all the details about Percom's new
Z line of quality mini -disk systems for Heath
Yes I'd like to know more about Percom Z doves anni
the Percom Z controller.
computers.
Rush me free literature
Fill out and mail us the coupon now.
-
Send to
PERCOM DATA COMPANY. Inc.. Dept 26P01
PEßCOM
11::5
PII Itxl
Oda, tam
75243
Toll -Free Order Number 1- 800 -527 -1222
112211 Pagemill Road. Dallas TX
name
,treet
<Ity
state
np
PRICES AND SPECIFICATIONS SUBJECT
TO CHANGE WITHOUT NOTICE.
© 1981 PERCOM DATA COMPANY, Inc.
75243
phone number
I
IH780
IHR
FORTH Modules. This package contains hundreds of FORTH definitions
not previously published. Included are
data structures, software development
aids, string manipulators, expanded 32bit vocabulary, screen calculator, typing
practice, and a menu- generation /selection program. The diskette provides examples of recursion (BUILDS..DOES),
output number formatting, assembler
definitions, and conversational programs. One hundred screens of software
and one hundred screens of instructional
documentation are supplied. These
screens may be used with Timin
POPULAR ELECTRONICS
contputex
FORTH or other FIG FORTH. $75 for
8" diskette ($15 added for other sizes).
Address: Timin Engineering Co., 9575
Genesee Ave., Suite E -2, San Diego, CA
92121 (Tel: 714 -455- 9008).
Tax Planning. The Individual Tax
Plan is designed for professional tax
practitioners and allows isolation of tax
effects attributable to changes in one or
more items of income/expense. It then
performs comprehensive tax planning
calculations. Automatic computations
include federal tax liability using appropriate tax tables and rate schedules,
income averaging, and maximum tax on
earned income with selection of lowest
tax due; add-on minimum and alternative minimum tax; 10 -year averaging for
lump -sum distributions; charitable contribution, medical expense, capital loss
limitations and capital gain deductions.
Results are displayed on screen or printer. Requires Apple II (48K) or Western
Digital Microengine. Address: Aardvark
Software Inc.,. 783 North Water St.,
Milwaukee, WI 53202 (Tel: 414 -2899988).
Plugs into existing sockets. $495 includes RAM, ROM, CP/M 2.2, and
seven CP/M manuals. Address: Parasitic Engineering Inc., 1101 Ninth Ave.,
Oakland, CA 94606 (Tel: 415 -8392636).
Medical Newsletter. The Micro
Medical Newsletter provides advice on
the use and selection of applications for
microcomputers in the medical office.
Free to practicing physicians and health
professionals when requested on office
stationery. Address: Charles Mann &
Associates, Micro Medical Newsletter,
7594 San Remo Trail, Yucca Valley,
CA 92284.
Heath Morse Code. The CW89 features a split- screen display, 4 to 99 wpm
operation, receive autotrack, 1000 character pretype buffer, 10 user -definable
messages, break -in mode, on- screen system status, disk I /O, hard copy and a
code- practice section. It runs on a Heath
H- 8/H -19, H- 89/Z -89 under HDOS.
TRS -80 Pinball. "Astroball" is a machine- language pinball game for the
TRS -80 Model I and Model II featuring
R-600
Front mounted speaker.
Optional 13.8 VDC operation,
using DCK-1 cable kit.
Carrying handle, headphone
jack, and record jack.
Digital display, easy tuning,
front speaker
The R -600 is a high performance,
R-1000
general coverage communications receiver covering 150 kHz
to 30 MHz in 30 bands, at an
affordable price. Use of PLL synthesized circuitry provides high
accuracy of frequency with
maximum ease of operation.
high -resolution graphics and sound. It
features space craft, flying saucers, and
black holes. Cassette or diskette. $19.95
plus $2 shipping /handling. Address:
Acorn Softward Products, Inc., 634 N.
Carolina Ave., S.E., Washington, DC
20003 (Tel: 202 -544- 4259).
Model Ill CP /M. Shuffleboard III allows a TRS -80 Model III to operate
with 64K CP /M. It comes with 16K of
RAM and 2K of ROM (expandable to
8K). It allows the Model III to have 88K
of memory. It includes Maxi -Disk
CP /M 2.2 having full support for single /double density 5" drives. The CP/
M enhances the keyboard and screen as
the keyboard can directly generate all
128 ASCII characters including CP /M
control characters. The screen can display 255 characters including the 96
printable ASCII characters, Greek and
Japanese letters, and scientific symbols.
It can also handle nondestructive cursor
moves and direct cursor addressing.
High performance,
easy to tune, covers
200 kHz to 30 MHz
Five -digit frequency display
with 1 kHz resolution and
analog dial with precise gear
dial mechanism.
Built-in digital quartz
R -600 FEATURES:
150 kHz to 30 MHz in 30 bands,
-
AM, SSB,
or CW.
Five-digit frequency display.
6 kHz filter for AM (wide), and
2.7 kHz filter for SSB, CW, and
AM (narrow).
Up- conversion PLL circuit, for
improved sensitivity, selectivity,
and stability.
Communications type noise
blanker.
RF attenuator allows 20 dB
attenuation of strong signals.
Coaxial, and wire antenna
terminals for low impedance
(50 Q). Wire terminals for high
impedance (500 Q).
"S" meter, with 1 to 5 SINPO
"S" scale, plus conventional
"S" meter scale.
100, 120, 220, 240 VAC,
50/60 Hz, switch selected.
Tone control.
clock/timer.
Three IF filters, built -in.
Noise blanker.
RF step attenuator.
120 -240 VAC, optional DC.
KENWOOD
TRIO -KENWOOD COMMUNICATIONS
1111
West Walnut, Compton, California 90220
CIRCLE NO. 46 ON FREE INFORMATION CARD
APRIL 1982
85
computers_____
Put Professional Knowledge and a
COLLEGE DEGREE
in your Electronics Career through
r,
HOME
STUDY
,
.4
6",
\1
N.
CONVERTERS
DESCRAMBLERS
Largest Selection
of Equipment Available
Earn Your
DEGREE
$ Buy Warehouse Direct & Save $
L
No commuting to class. Study at your
own pace, while continuing your present
job. Learn from easy -to- understand lessons, with help from your home -study
instructors whenever you need it.
In the Grantham electronics program,
you first earn your A.S.E.T. degree, and
complete
40 channel
converter
c1.cnE OUT
SPEC'IAI.
$3895
36 channel
wired remote
then your B.S.E.T. These degrees are accredited by the Accrediting Commission
of the National Home Study Council.
Our free bulletin gives full details of
the home -study program, the degrees
awarded, and the requirements for each
degree. Write for Bulletin ET-82.
Grantham College of Engineering
2500 So. LaCienega Blvd.
Los Angeles, California 90034
converter
$9495
Send $2 for complete catalog
of converters and unscramblers
Quanlily Discounis
Add
Sao
shipping
-Mich.
Visa Master Charge
residents add 40'o sales as
C &D Electronics, Inc.
P.O. Box 21, Jenison, MI 49428
(616) 669-2440
Popular Electronics
Now your magazines can be a handsome addition to your decor, well
organized, and easy to find, thanks to these durable library -quality
cases or binders. They're made of luxury -look leatherette over high
quality binders board. And both styles are custom -designed for this or
any magazine you save, with size, color, and imprint selected by the
publisher. FREE transfer foil included for marking dates and volumes.
-
Magazine binders
hold
a
year's issues on
individual snap -in rods.
combining them into one
volume. $7.95 each: 3
for $22.50: 6 for $42.95.
Mixed titles OK for
quantity prices.
store your issues for individual
reference. $6.95 each. 3 for $19.75:
6 for $37.50.
Mixed titles OK
Philadelphia. PA 19141
Please send
Cases
Binders
QUANT.
TITLE
Popular Electrongs.
(Other).
Add S 1.00
ENCLOSED IS s
per order for postage L handling. Outside USA
add 52.50 per unit ordered. Send U.S. funds onte
CHARGE IMin. 5I0).
American Express
for quantity
Card
prices.
Exp. Date
VISA
sla,tei Chai.i.
Signature
Print Name
-
86
aCHARGE ORDERS ONLY
for your convenience PHONE 24 HRS.
TOLL FREE 800 -345.8112
In Pennsylvania only 800 -662 -2444
expands the usefulness of H.C. Penning -
ton's "TRS -80 Disk and Other Mysteries" book. It includes procedures for
disassembling system files, disassembled
boot loaders with comments, and popular methods of rendering diskettes difficult to copy. It also includes a utility for
viewing a file's device control block.
Diskette is $17.95 plus $2 postage. Address: Applied Software, 4316 Vermont
Ct., Virginia Beach, VA 23456.
Suporoalo for CP /M. The spreadsheet software package Supercalc is
available in 51/4" and 8" formats for the
Apple CP/M, Xerox 820, North Star,
Superbrain, Micropolis, Zenith, Osborne, and Vector Graphics machines.
Features include merging several sheets
into one, an extensive help command to
guide the user, automatic formatting of
printed reports, and ability to examine
all formulas contained in the worksheet.
$295 including user guide, reference
card, and install program for over 25
terminals. Address: Sorcim Corp., 405
Aldo Ave., Santa Clara, CA 95050 (Tel:
408 -727 -7634).
Scope to Computer. The Nicolet /85
program transfers 4096 sampled data
points from a Nicolet Digital Oscilloscope to a Hewlett- Packard HP -85 in
1.3 seconds. Once transferred, the user
can PLOT the waveform on the CRT or
plotter, STORE the waveform on tape or
diskette, LOAD a previously stored waveform, TRANSMIT a waveform from the
HP -85 to the Nicolet, FORMAT the data
points for the HP -85 waveform analysis
package, and store formatted data on
tape or diskette. $150. Address: Tensegrity Inc., 2424 W. Addison St., Chicago,
IL 60618 (Tel: 312 -935- 8192).
Popular Electronics, P.O. Box 5120.
.
Open-back cases
TRS-80 Information. This package
ONLY
Shelf Conscious?
Now you can organize your copies of
One disk drive and 32K RAM are
required. A hardware interface such as
Commsoft Codem is required. $99.95.
Complete package including Codem, cable, power supply, and complete documentation is $249.95. Address: Comm soft, 665 Maybe!! Ave., Palo Alto, CA
94306 (Tel: 415- 493 -2184).
Address
Graphics Printing. Designed for the
Apple II, Apple II Plus with Apple soft
ROM, 48K, DOS 3.3, and serial interface card, the Graphics Printing System
allows printing of hi -res graphics on
Diablo Model 1620 or 1640 and NEC
Model 5510 or 5520. The program provides a wide variety of print sizes and
formats, and any one or two ASCII
characters can be used. Program operation is displayed on screen as printing
proceeds. A MagicFrame utility pro-
vides for an on- screen selection of the
area to be printed. $104.95 plus $4.95
postage /handling. Address: Progressive
Software, Suite 323, Blue Bell West,
Blue Bell, PA 19422 (Tel: 215 -628U
2383).
City.State.Zip
IL, MA. MI. Mu, NJ. Nn
State. OH. SC. TN and VT add applicable sales tax.
Residents of CA, CO, DC, FL,
POPULAR ELECTRONICS
WE TAKE
YOU BY
THE HAND!
whatever alarm device you choose. As
long as the protected object is left violated the alarm will sound. If the intruder closes the door (or whate4r), the
alarm will continue to sound until the
555 -timer interval (about 25 seconds)
expires. The alarm then shuts off saving
the battery, and rearming. The entrance
delay will be completely restored when
the charge leaks off Cl. (Note: KI is a
1000 -ohm, 8 -mA sensitive dpdt type. A
more sensitive relay will enable the
device to work on a lower voltage.)
Components RI and Cl will vary
according to the voltage, the time delay
desired from intrusion to alarm sounding and the peculiarities of your 555.
The 12 -V dc supply and a 3- second
delay time take one megohm for 121 and
470 µF for Cl with my 555. Use an ordinary electrolytic because a very good
cap will not leak off charge and restore
the opening delay after an intrusion.
l'ps&
1ECHMK?UCS
Security System
I worked out this "universal security
system" to protect a tool chest but it can
be used for other applications. The basic
idea is that opening the device to be protected will close switch Sl. You then
have a few seconds (determined by the
time constant of RICI) to turn off the
alarm or it closes the relay, a dpdt type.
The relay uses one set of contacts to
latch SI shut and thereby hold the
alarm on and the other set to operate
H. Scott McCann, Annapolis, MD
You'll learn all about computers: how
to build, program, service, even play TV
games without knowing the first thing
about it!
The New ELF II
"Beginners" Package
-
Your own expandable micro -computer
kit, 5 diagnostic analyzers plus circuit,
programming, diagnostic manuals, even
games you can play on TV. All only
12v
RI
$ 139.95.
(SEE
TEXT)
IM
Even if you don't know bits
m bytes. now if s easy and
inexpensive to build your ow
icro-computer. learn how it
works, program it. service it edtn play games with it on your
TV! Ifs here in the New ELF II "Beginners" Package, only
from Netronics. Only $139.95. Here's the package: I. your
own micro-computer, the famous ELF II (featuring the RCA
1802 CMOS microprocessor) in kit form with step -by -step
instructions on how to build it. Diagnostic Analysers including
2. your own Logic Probe. 3. Pulse Catcher. 4. 8 bit Test
Registor. 5. Logic Analyzer. 6. Gate Arrays. 7. Non -Technical
Manuals on how to use analyzers. how to get into the guts of the
computer. what makes it tick, how to service it. 8. Sample
Programs that teach you machine language programming plus
how to correct or "debug" any programming mistakes. 9. TV
games you can play. If your TV set has no video input, an
optional converter (RF Modulator). is available. Then, once
you've got this "Beginners' Package under your belt. keep on
expanding your ELF II with additions like the Typewriter Key
Board. added RAM. Full Basic Interpreter, Electric Mouth
Talking Board. Color/Music. A /D -D /A Boards for Robot
Controls and much. much more. We'll take you by the -hand
TO
ALARM
Avoid "Cooked" Solenoids
Every now and then I find someone who
has a "cooked" solenoid in a door chime.
Either the button stuck or the wiring
malfunctioned causing excessive current
and allowing things to overheat. Here is
a circuit to avoid this sort of thing. I
computer and microprocessor products.
Continental U.S.A. Credit Card Buyers Outside Connecticut
CALL TOLL FREE 800- 243 -7428
To Order From Connecticut or For Technical Assistance, Etc.,
Call (203) 354 -9375
NETRONICS R&D LTD.
RI
R2
(SEE
(SEE
TEXT)
333
S139.95
S
8.95
I$6.00 Canada)
Connecticut Residents add sales tax
Total Enclosed
MAT
SWITCH
$
Personal Check
Cashier's Check /Money Order
Visa
Master Charge (Bank No.
CHIME
Acct. No.
Signature
Print
Name
SI
CI
10,
PE -4
Plus S3.00 for postage. handling and insurance
--L-
400V
O,ni
Litchfield Road, New Milford, CT 06776
Please send the items checked below:
ELF II "Beginners- Kit
RF Modulator
32
DOORBELL
BUTTON
IA
AC
marry with keyboard scanning circuits. built. in power regulator. 5 slot plug-in
expansion BUS (less awnectors), stable crystalclock for timing purposes and a
doubk- sided. plated thrall, PC Board plus RCA 1861 video IC to display any
segment of memory on a video monitor or TV screen alongwith the logic adsupport
circuitry you need to learn every one of the RCA 180T scapebilities. Thediagnostic
analyrers aid in understanding and trouble shooting your ELF 11. as well as other
minute. -W. Waite, Wellington, OH
DI
117 V
Specificngns: ELF II "Beginners- Package
The computer features an RCA CMOS 18028 bit microprocessor ddresuble to
64K bytes with DMA. mtermpt, 18 Registers. ALU.256 byte RAM expandable to
64K bytes. Professional -Flea keyboard. fully decoded so there's no need to waste
1
originally used it as an annunciator circuit under a mat at the entrance of my
TV service shop.
The ac from the standard doorbell
transformer is rectified by diode DI, and
charges capacitor Cl through resistor
RI. Switch SI across R2 is normally
closed. Capacitor CI is relatively large,
TEXT)
with the New ELF II "Beginners" Package. Only $139.95.
Mail or phone in your order today and begin.
10,000 -SF, 25 -V nominal value (whatever is available in surplus). Diode DI is
a -A, 400 -V diode, although the voltage rating doesn't have to be that high.
Resistor Rl is chosen by experiment to
pick a time to allow the capacitor to
charge between "pulses" or doorbell
button operations. Pushing the button,
S2, or stepping on the mat to close S3
discharges the capacitor through the
chime. Resistor R2 can be made
much higher in resistance than Rl so
the bell can operate only about once a
000y F
Exp. Date
i
Address
City
State
APRIL 1982
L
Zip
J
Get A GNOME
the original micro -synthesizer
Every dcy more people discover that PAIA's
GNOME is the most versatile, cost effective
special effects device on the market today.
John Simonton's time -proven design
provides two envelope generators, VCA, VCO
and VCE in a low cost, easy to use package.
Use alone with its built in ribbon controller or
modify to use with guitar, electronic piano,
polytonic keyboards, etc.
The perfect introduction to electronic music
and best of all, the Gnome is only $69.95 in
easy to assemble kit form. Is it any wonder
why we've sold thousands?
HOB'
SENC
By Leslie Solomon
Technical Director
Simple Burglar Alarm
Q. All the intrusion alarms I have seen
are very complicated. Isn't there a simple
way to detect intruders without too much
electronics ? -Angelo Galante, Chicago,
on the same line as the dimmer is that
the RFI is transmitted to the receiver of
the radio, thus it doesn't need the power
620
r
I
W. Wilshire
lM.
OMbYeela City. OK 73116
Send GNOME MICRO- SYNTHESIZER Kit
($69.95 plus $2.00 postage)
Send FREE CATALOG
I
St
A. In many cases, the simpler the circuit, the more reliable the operation
(William Occam, Occam's Razor). The
circuit shown here is as fundamental as
you can get and works every time. The
trick is to get the SCR to fire thus energizing the alarm (which can be anything
+6V
V1Sf
name
Si
address
city
visa
_
m.c.
_
state
card no.
_
$79
$4.00
GND
line. There are two possible reasons
you're getting RFI and your friends
aren't. First, you may have a faulty dimmer and second, you may have a dimmer without internal filtering. To solve
the problem, either buy a better dimmer
or else try connecting capacitors from
external leads to ground on the dimmer
you have as shown in the acompanying
I need a simple electronic doorbell
circuit that will produce a different tone
for each of the front, side, and rear
doors. Is there a simple way to do this? I
do not want to spend a lot of money on a
complex electronic device. -David KeelQ.
CIRCLE NO. 38 ON FREE INFORMATION CARD
Rivals long
wires
C2
.0111F
Three-Tone Bell.
Dept. 4P
14051843 -9626
1020 W. Wilshire Blvd. Oklahoma City. OK 73116
Covers 300 KHz - 30 MHz.
For SWL, BCL, VLF DXers.
CI
.OIyF
generalized diagram.
zip
NEW INDOOR
ACTIVE
ANTENNA
DIMMER
17V
IL
son, Dawson, CO.
from a piezoelectric device to a Sonalert
or even a light bulb). If any of the parallel- connected switches Si through Sn
(any number) are closed or, if any of the
series -connected switches S2 through Sn
(any number) are opened, the gate of
the SCR is triggered and the alarm
works. Reset is by opening the do feed to
the SCR.
A. The most basic electronic doorbell is
shown here. Although only three pushbuttons are shown, you can use more,
shipping)
MFJ-1020 NEW INDOOR ACTIVE ANTENNA
sits on your desk ready to listen to the world.
Rivals, can often exceed, reception of outside
g wire. Unique Tuned Active Antenna mini
mizes intermod, provides RF selectivity, reduces noise outside tuned band. Also use as
preselector for external antenna. Covers 300
KHz to 30 MHz in five bands. Adjustable telescoping antenna. Controls: Tune, Band Selector,
Gain, On- Off /Bypass. LED. FET, bipolar circuitry.
Phono jack for external ant. 6x2x6 inches.
912 VDC or 9 V battery for portable use.
110 VAC with optional AC adapter, $7.95.
Order from MFJ and try it. If not delighted,
return within 30 days for refund (less shipping).
l
One year unconditional guarantee.
Order yours today. Call toll free 800-647-1800.
Charge VISA, MC.
Or
mail check, money order.
CALL TOLL FREE
IVI FJ
...
800-647 -1800
Enterprises, Inc.
BOX
494, MISS, STATE. MS 39762
CIRCLE NO. 50 ON FREE INFORMATION CARD
Dimmer RFI Problems
Q. Please give me any information you
can on how I can eliminate the hum in my
AM radios caused by a dimmer control
which is 100 feet away and not on the
same circuit. This condition is most
annoying yet I have friends who also have
dimmers but do not have this problem.
Louis Halmy, Hollywood, CA
-
A. Many light dimmers use a silicon
controlled rectifier (SCR) in their circuits. The switching action of the SCR
produces a waveform that contains high frequency harmonics. It's this high -frequency component of the waveform that
produces radio -frequency interference
(RFI). The reason you hear the hum
caused by the RFI on a radio that's not
with each having a different series resistor. The value of the resistor determines
the tone. If you want more volume, use a
low -value resistor in place of the speaker
and connect the upper end (and ground)
to an audio amplifier.
Have a problem or question in circuitry, componenta, parts availability, etc? Send it to the Hobby
Scene Editor, POPULAR ELECTRONICS, One Park Ave.,
New York, N.Y. 10016. Though all letters can't be
answered individually, those with wide interest will
be published.
POPULAR ELECTRONICS
CLEL11CNCS
LIDRAIN
signed to give the reader, first hand, a
sense of the instruments' capabilities
and limitations.
Published by: Howard W. Sams, 9300
W. 62nd St., Indianapolis, IN 46268.
Soft cover. 318 pages. $19.95.
Secrets of Ham Radio DXing
by Dave Ingram, K4TWJ
Written from a practical rather than a
theoretical standpoint, this is a useful
Using Micro -Computers in Business
by Stanley S. Veit
Subtitled "A Guide for the Perplexed,"
this book addresses itself to the businessman with no specific interest in computers other than that they should help him
run his operation more efficiently. The
author does not discuss the practical
operation of computers, i.e., program
writing, which key to press, etc., but
instead concentrates on elucidating, for
the uninitiated, what computers do.
Since the world of computing has
evolved its own terminology, attention is
given to rendering such expressions as
"floppy disks," "menus," "word processing," "batch operation," etc. into
plain English. The reader can then, presumably, understand a computer salesman and make an informed judgement
about what he should or should not purchase.
Published by Hayden Book Company,
50 Essex St., Rochelle Park, NJ.
07662. Soft cover. 142 pages. $9.95.
guide for anyone who wants to learn
more about operating a ham radio. The
focus of the book is on techniques for
raising and maintaining distant radio
contacts, i.e., methods for operating
each of the amateur bands, from 160
meters through vhf; and various DX
modes, from CW to TV. Techniques for
setting -up antennas, amplifiers, audio
filters, and the like are also discussed.
You won't find much about how the
hardware actually works, but the author
compensates by providing lively and informative anecdotes from the world of
DX talking.
Published by TAB Books, Inc., Monterey Ave., Blue Ridge Summit, PA 17214.
Soft covers. 176 pages; $7.95.
OHM GIVES AWAY
$125,000 IN SUPERB
SOUND.
Data Transmission
by Dogan Tugal and Osman
jugal
Addressing themselves to the issues associated with installing and upgrading
data transmission systems, the authors
focus on the usual range of problems in
an operations center, and the limits and
tolerances of various pieces of equipment. Attention is given to data security
during transmission, voice -line measurements, noise -free communication, fiber
optics, synchronization of digital data,
multiplexing, satellite and ground -based
transmission, and protocols. Also discussed are the international standards
recommended by the CCITT.
Published by McGraw -Hill, 1271 Aveof the Americas, N.Y., N.Y. 10020.
nue
Hard cover. 394 pages. $24.50.
Analog Instrumentation Fundamentals
by Vincent F. Leonard, Jr.
Analog instruments have not yet been
wholly superseded by digital equipment.
Many of them are still around; and there
are some advantages they have over digital instruments, e.g., the observation of
trends, and the measurement of voltage
in a strong EM environment. This book
provides an overview of analog instruments for those with a basic knowledge
of electronics and some working experience with elementary algebra. Students
and hobbyists should find it helpful
because of its experimental approach:
The familiar analog instruments
(ammeters, ohmmeters, voltmeters) are
explained in terms of experiments deAPRIL 1982
No entrance fee, nothing to buy. Phone right now and
enter one of the most exciting contests in years. Over 11,500
winners. Top prizes? 100 new Ohm Walsh 2" loudspeakers and
1500 audiophile records. It all adds up to $125,000 worth of top tech sound and the discs to prove it. In the past six months, more
than 200 top audio specialists have compared the new Ohm
Walsh 2" to most of the best -regarded speakers on the market
today. Their findings? On all types of music, the Ohm Walsh 2"
was equal to the highest priced. And on stereo imaging, the Ohm
Walsh 2" was always superior. The new Ohm Walsh 2' retails for
for less than $700 a pair. Hard to believe? If you haven't heard
about Ohm's stunning breakthrough, you
will. PHONE TOLL -FREE: (800) 221 -6985
except New York: (212) 783-1120. Or write:
Ohm Acoustics Corp., 241 Taaffe Place,
Brooklyn, New York 11205.
We make loudspeakers
Ohm
correctly.
CIRCLE NO. 35 ON FREE INFORMATION CARD
89
t
HITACHI
IALC
WARE
SPRING
OS
YOUR
MAIL-ORDER
ELECTRONIC
SUPPLY HOUSE!
WITH 2 YEAR WARRANTY
8 CHANNEL SCOPE
MULTIPLEXER, DM -12
Convert your single channel scope into a 4 or 8 channel instrument. lust connect
the DM -12.8 channel scope multiplexer to your scope. clip the 8 Input probes to
can handle logic level TTL
the signals you want to view. Simple, easy. fast
signals from DC to 3MHz Features separate spacing and trace amplitude controls and selectable sampling rate
all to insure easy clear scope display
MARCH 15, 198:
-
-
Big discount
Completely
Assembled and
tested! Ready
to use!
--
--
compatible input channels (1 TTL load per
channel) can drive 50 Ohm scope cable.
Maximum full screen amplitude 1.6 Volts adjusta8 1TL
ble.
Trace amplitude and spacing controls.
4 or 8 channel selector switch
8 color coded input cable. 24" long with insulated
LOW COST HIGH
FREQUENCY COUNTER
MODEL V -1518
OC -15 MHz
OSCILLOSCOPE
$49995
MODEL V-152B
DC -15 MHz
dual-trace
OSCILLOSCOPE
$64495
single -trace
VIEW 8
CHANNELS
AT ONCE!
alligator clips
External 9 VDC power supply included (Model
MMAC-2).
Size 625 "x375 "e 2"
BNC Output Cable Accessory (Model PSA -2 add
514 951
LOW COST CAPACITANCE
METER MODULE, DM -8
Connect this high quality low cost Capacitance Meter Module. DM
B to your digital Volt Meter and turn it into a Digital Capacitance Methe Low Cost Way!
-
/7 /7IJy1111M
MODEL NO. DM -7
MODEL V -3026
DC -30 MHz
dual -trace
OSCILLOSCOPE
-
$85995
LU
CDIPDIIÌ
Completely
assembled and
tested! Ready
:r-
`I.lá
...
'ra/1-
-
- -J
i
x 3
75"
x
1
or
1
0 sec gare
'
1
$135 °°
TI IIITAiI I/Ill
1 II t1ElItICIluur
$214900
Illz
llllz
PUN
-I1P1r-
III-
IIz
-Illlz -ñÌl
-1111111
Hop
NPII
1
Size 6 25"
nigh Intensity LED display
i _ 3 ppm 'i
25 controlled 0
Convenient bencntop sae r7 x10 x3
durable attractive case
Crystal
FREQUENCY METER MODULE
"5Hz to 100MHz ", DM -11
MODEL V -1050
100 MHz
Quad-trace
delayed sweep
OSCILLOSCOPE
Push to read range (button) from 1pF to
20.000 F
Zero calibration control
In one easy to use. self -contained package
Battery powered. with '' push to read battery saver circuit 19V batteries not included
e
COMPLETELY
ASSEMBLED
PRE -CALIBRATED
PRE -TESTED
$154900
to use!
m
Ora
--
MODEL V -550B
50 MHz
dual -trace
delayed sweep
OSCILLOSCOPE
to 550 MHz
big easy-to -read 43
5 As
-
ter-
011818
IIIIIMM\\U\\\
lt
2-
P*1
tall
REGULATED TRIPLE POWER
SUPPLY, LOW PRICED!, DM -6
fully assembled and tested power supply that provides a solid fully wired
power supply including fixed 5V in Amp. 5V to 15V in 0.5 Amp, and 15V in 05
all supplies regulated. shod proof. Each supply has
mtllcator LED. Complete and ready for use in a durable 18- x 6- e 3 1 2'1
A
p-
1
triple
5V to
shod
meta
case
¡áLBif ñLONIE N
FREE
Measure frequencies from 5Hz to 100MHz on your 0.goa: vo meter w h a rem.u!mn or 312
nome nobbv
Conner the
digits
easy to use - perfect for held service - lab rest ng
DM -11 to your DVM set the DVM to Ine 2VDC range connect a signai to the DM11 via a BNC
cable not inciudedl and measure the frequency of any source H. lo Range LEU s insure last
-
DM -12, 8 CHANNEL SCOPE
MULTIPLEXER WITH EVERY SCOPE
SOLD DURING THIS SPECIAL SALE,'
accurate readings
Frequency Range 5Hz to 100MHz
input Impedance I MegOnm
nut sensitivity 100Hz BOMV
-
$9000
100 Hz
-
-
.60MHz
Size
60MHz 30MV
70MV
625 x375 x2
External 9V DC power supply
(Model MMAC -2i
BNC
nruded
input Cable Accessory ¡Mod,.
:
3dd 514 95
ORDER DIRECT
FROM OUR
WAREHOUSE
AND SAVE!
ALBIA SATISFACTION WARRANTY:
It for any reason, whatsoever, you are not completely satisfied with
your purchase, return it within 30 days of purchase date for a full
refund
its as simple as that! Shipping 8 Handling charges not
-
refundable.
FOR FAST AND DEPENDABLE DELIVERY SERVICE
CALL TOLL FREE: 1- 800 -243 -6953
IN CT, AK & HI CALL
COLLECT (203)467-5590
9
5
A.M. to
P.M. E.S.T.
WE ACCEPT MASTER CHARGE, VISA AND AMEX CREDIT CARDS
Connecticut Residents add 7r'2°° Sales Tax
Prices shown in
U S
currency only Foreign orders add 15 °n
ALBIA ELECTRONICS INC
44 KENDALL ST.
P.O. BOX 1833
NEW HAVEN. CT 06508
$63 °°
POSTAGE & HANDLING
ORDERS
UPTO$1000
ADD
$t 95
$1001 -$2500
375
$25.01
4
-
$50 00
65
$50 01 -$100 00
6.45
ORDERS OVER $100.00
WITHIN UNITED STATES
7
FREE ALBIA
DESIGNERS
TEMPLATE
WITH EVERY
ORDER RECEIVED
55
OUSE DIRECT
CLEARANCE!
CEPTED
MAY 15, 1982 0 N LY
TH R U
ON THESERSALE
ITEMS
off our lowest prices!
GLOBAL INSTRUMENTS
BECKMAN MULTIMETERS
30% OFF!
DM -9 Logic Probe
ALBIA'S ECONOMY DIGITAL
DM -9 MULTI -LOGIC
COMPATIBLE 5 -15VDC PROBE
The features are many on this quality Albia
test instrument; will
detect low rep. rate
pulses (up to 1.5
MHz); detects low,
high or pulsed logic
levels with a minimum detectable
pulse width of
300 nsec.
Easy -tointerpret 3 LED
readout. Built in over-Voltage
and reverse
polarity
protection.
NOT
A
KIT!
SPECIFICATIONS
IMPEDANCE 300.000
THRESHOLD Logic
thresholds
-LEO) 70% Vcc
Logic 0 thresholds ILO -LEDI 30% V¢ MIN DETECTABLE PULSE WIDTH 300 nanoseconds.
5 MHz. PULSE
MAX. INPUT SIGNAL FREQUENCY
DETECTOR (PULSE LED) High Speed pulse train or
transitions) activate 1 10 secsingle events - or
INPUT
Ohms
1
I
1
Model
I
ond pulse stretcher
No. DM -9
Stock No
j® ®
1
.l_....-._
TECH 300
MAX. INPUT VOLTAGE
7.0009
x D 5.8x1 0x0
(85g) POWER LEADS 36- (61
cm) with color coded insulated
clips
T
1147
x
25 4 x 17
R
mrn WEIGHT
i
MODEL
$18000
SUPPLY
3001
Digital capacitance meter Measurement
range. 1 pF min 199.900uF Max. 9 ranges.
1pF resolution accuracy - 0.1% of reading 5". 312 digit display
$14500
RESISTOR SUBSTITUTION BOX
$25000
MODEL 4001
Pulse generator .5Hz -5MHz range. 100mV10V positive output
$21500
RANGE r
TECH 330
330
312 digit multimeter True RMS. 0.1%
VDC accuracy, 10 Amps AC and DC
$21900
ranges, visual continuity indication
100
$44100
I
MODEL 4401
Frequency standard, 1Hz -10 MHz. crystal
oven oscillator
0.5 ppm from 0.40°C
$26000
factory calibrated to N.B.S. vis WWVB
Logic Probes
Max.
Frequency
Pulse Width
Global Model LP -1
10 MHz
50nsec
Global Model LP -2
1.5 MHz
300nsec
Global Model LP -3
60 MHz
6nsec
100 MHz
3nsec
iK
1.5K
2204
\
47K
e701,
-
-
24
\
2.2K
\
15K
tg(
3.3N
$22900
4.7K
hug
IM
2
4 7M
10M
ANGf 1-riANGE
DM13
2
TECH 360
Bench /Portable 312 digit multimeter,
true RMS. 0.1 % VDC accuracy, tempera-
$28900
Model DM -13 Kit
money at the same time. Stop wasting
time looking for the right resistor, here's a handy kit that you can easily assemble
that will provide everything you'll probably need at your fingertips.
With complete step -by -step easy to understand assembly instructions
All resistors are 12 Watt. tolerance
5%
-- 5% accuracy
Have fun building this useful kit and save
--
HO -100
$5000
$3200
$7000
$15000
\
100K
I
ture measuring capability, 10 Amps AC
and DC ranges, audiblevisual continuity.
0-20 Ohms, 4 year battery Mel
Min.
//
-
-
47
Bench /Portable 312 digit multimeter,
0.1 %VDC accuracy. 10 Amps AC and DC
ranges. audible visual continuity, 0 -20
Ohms, 4 year battery life!
150K
690
\
220
TECH 350
650MHz frequency counter 5Hz to 650
MHz 10MHz crystal oven timebase traceable to NBS
RANGE 2
470
i
MODEL 6001
Global Model LP -4
LOW COST RESISTOR
SUBSTITUTION BOX
TECH 310
312 digit multimeter 0 25% VDC accuracy 10 Amps AC and DC ranges. visual
continuity check capability
oz.
LIMITED
MODEL 2001
Function generator 1Hz- 100KHz; waveform, sine -triangle -square, output; leverl,
50mV-5V p-p into 600 impedance, 600.
VCO range; 10'.1
3
86
$
$12000
312 digit mulbmeter 0.5% VDC accuracy
2 Amps AC and DC ranges
50V
continuous 120VAC for less than 15 seconds POWER
REQUIREMENTS 5 Volt Vcc 30 Ma 15 Volt Vcc 40 Ma 25
Volts max with power lead reversal protect on OPERATING TEMPERATURE 0 to 50.0 PHYSICAL SIZE L a W
Heavy duty 302 digit industrial multimeter. 0.25% VDC accuracy. drop- proof,
waterproof. high ovetload protection, 2
Ñps AC and OC ranges, visual continu -
$16900
24 positions
2
$2988
ranges
7
OUR LOWEST
PRICE
EVER!
MODEL
DM -13
STOCK NO
15 -0013
& GET YOURS
WHILE SUPPLY LASTS!
HURRY
HURRY! ORDER TODAY WHILE
SUPPLIES LAST! DON'T BE
DISAPPOINTEDAT
5
TIME OF SALEMNO DEALER ORDERS PrLEASE!
t#N$
VWP
YOUR
MAIL-ORDER
ELECTRONIC
SUPPLY HOUSE!
CIRCLE
NO
3
ON
FREE
INFORMATION
CARD
bridge and amplifier circuits. They provide a reasonably linear, or at least predictable, output signal.
Applications for the new generation of
solid -state pressure sensors range from
SOLID-SVIlE
DENCLOPMCNTS
By Forrest M. Mims
Mercury, Vacuum and Solid-State Pressure Sensors
THE legacy of Galileo extends
beyond his discoveries of the laws
of motion, for in 1643 one of his pupils,
Evangelista Torricelli, invented the mercury barometer. Torricelli's barometer,
which he invented at age thirty -five
(just about the average age of readers of
POPULAR ELECTRONICS), enabled him to
make accurate measurements of atmospheric pressure. The barometer consisted of a glass tube that was sealed at
one end, filled with mercury, and inverted with its open end immersed in a
dish of mercury. The level of the mercury in the tube, typically some 30 inches
at sea level, indicated the pressure of the
atmosphere on the mercury in the dish.
Mercury baroíltteters are expensive,
big, and heavy, yet fragile. They have
largely been replaced by aneroid barometers, which sense atmospheric pressure
by means of an evacuated metal chamber formed like a flexible bellows or having a flexible surface. Changes in the
external pressure cause the surface of
the chamber to expand or contract.
These changes are amplified by a mechanical linkage that, in turn, drives a
pointer. The pointer moves over a scale
calibrated in inches (or millimeters) of
mercury.
Though aneroid barometers are much
smaller, lighter, and cheaper than those
that use mercury, their readings are not
readily translated into electrical signals.
For example, on my desk is an aneroid
barometer taken from a balloon-
launched radiosonde. Though the aneroid chamber is a relatively compact,
disk-like bellows, 2.25 inches in diameter and less than 0.25 inch thick, the
entire assembly is fairly large.
The large overall size of the unit is
due to its mechanical nature. Converting the expansion of the bellows into
suitable electrical signals that can be
radioed to ground requires an aluminum
frame that supports the bellows, a movable pointer -like stylus, and an intricate
etched -circuit pattern on a rectangular
board measuring 0.85 x 2 inches. The
complete assembly is 2 x 3 x 4.5 inches
and weighs about three ounces.
Many other mechanical pressure sensing devices have been invented. For
example, a spiral coil of hollow glass,
quartz, or metal that is sealed at one end
will slightly wind or unwind as the pressure of a gas or liquid in the tube is
altered. This motion can be mechanically amplified and indicated by a simple
pointer system attached to the innermost end of the spiral tube.
Solid -State Pressure Sensors.
There will always be a role for simple,
low -cost, mechanical pressure sensors.
But today's move toward increasing automatic readout and control has stimulated the development of a new generation of solid -state pressure sensors.
Many of these are so small that they can
be incorporated into miniature packages
similar to ICs, along with any necessary
_r a
FORCE
NYLON MACH. SCREW
APPLY THIN COATING
OF SEALANT
METAL WASHERS
_
W-
Callv
CONNECTING
LEADS
INSULATED
SUPPORT
BASE
(SEPARATE)
Fig. 1. A simple force transducer made with
pressure sensitive paint between two metal washers.
94
monitoring automobile engine parameters to detecting blood pressure. They
can even be used to make miniature, solid -state barometers and altimeters.
Solid -state pressure sensors are not
necessarily semiconductor devices. For
example, ELAB Microducers, Inc.
(3178 Pullman St., Costa Mesa, CA
92626) makes a pressure- sensitive paint
that can be used to make very simple,
reliable, and cheap pressure- sensing
250
200
_
0
150
s
o
0.5
1.0
1.5
FORCE (OUNCES)
2.0
Fig. 2. Force /resistance curve of a
cell such as shown in Fig. 1.
cells. Figure 1, for example, shows a typical low -cost pressure cell made from
ordinary hardware and a drop of Microducer Pressure Sensitive Paint. A cell
like this can detect a pressure load of a
small fraction of an ounce. Figure 2 is
an ELAB plot showing no -load to fullload resistance of a typical cell.
Pressure -sensitive paint can be used to
make simple potentiometers, bracelet style pulse sensors, pressure- sensitive
cloth, and magnet switches. Though the
cost of individual sensors is very small, a
one-ounce bottle of paint (sold with
thinner and applicator) costs $87.00.
For details and application information,
write ELAB.
You might be able to make your own
pressure- sensitive paint by mixing copper filings in a suitable base. Several
years ago, I made force transducers by
painting flexible, insulated rods with
copper paint. Similar conductive paints
are used to repair etched circuit
boards.
Monolithic pressure sensors made
from silicon are considerably more sophisticated than those made with pressure- sensitive paint. Figure 3, for example, shows the recently announced
149PC pressure -to-current transducer
POPULAR ELECTRONICS
SIMPLE SIMON ELECTRONIC KITS, Inc.
made by Micro Switch, a division of
Honeywell (11 West Spring St., Freeport, IL 61032).
This transducer is a hybrid integrated
circuit that incorporates a 0.1 -inchsquare silicon chip with a sensing diaphragm etched into it. Resistors are ion implanted into the diaphragm, and their
resistances vary as the diaphragm is
flexed. This gives an output current proportional to the diaphragm pressure.
A drawback of silicon pressure sensors is temperature sensitivity. The
149PC transducer overcomes this problem by means of laser- trimmed, thick film resistors on the hybridized substrate to provide precise temperature
compensation. Response time of the
149PC is 1 millisecond, and it produces
an output of from 4 to 20 milliamperes
in response to an input pressure range of
3 to 15 psi. Micro Switch says the cost is
under $100.
Micro Switch makes an entire line of
solid -state pressure sensors. National
Semiconductor (2900 Semiconductor
Drive, Santa Clara, CA 95051) does
also. A very interesting book on my shelf
INTRODUCING OUR NEW
STVA 14 ELEMENT
+
7
SWD PARTS
11
MITSUMI
CORNER REFLECTOR
YAGI ANTENNA
VARACTOR
UHF TUNER
aIet
a
s
III
u
I
Model UES -A56F
$34.95
ne
I
11
- 889MHz
Freq. Range UHF470
I
Antenna Input 75 ohms
14-83 Output Channel
Channels
PART
NIT
NO
1
Features:
VT1
PRiCt
NO
DESCRIPTION
-SW
Varactor UHF Tuner, Model UES -A56F
2
CBI -SW
Punted Circuit Board, Pre -Drilled
3
TP7 -SW
PCB Potentiometers. l -20K,
LONG RANGE
5 -1OK
4 FR35 -SW
14.5 dB GAIN
3
5
PT1 -SW
6
PP2
1
$34 95
18.95
-1N and
4 95
Power Transformer. PRI- 117VAC, SEC- 24VAC.
NARROW PATTERN for adjacent
7
-SW
SS14 -SW
Panel Mount Potentiometers and Knobs.
and
I
ICs
7
ANODIZED FINISH
I
-IKBT
5.95
-SKAT w, Switch
-pcs, Diodes 4 -pcs Regulators
Heat Sink
interference rejection
1
7
-pos
29 95
-pace
8
CE9 -SW
Electrolytic Capacitor Kit, 9- pieces
9
CC33 -SW
Ceramic Disk Capacitor Kit 50 W V
10
CT -SW
Varible Ceramic Tnmmer Capacitor Kit
11
L4 -SW
12
ICS -SW
Coil Kit.
7 95
5 95
piece IPsewound
137 -12 Ferrite Turroid
1
#76
Sockets. Tin inlay.
IC
227ihs
lamhs 2- pieces
inductors) and
Core with 3 h of
STVA -3 14.5 dB Selectable Comer Vagi
Cut for Channels 60 thru 68.... $16.95
STVA -4 14.5 dB Selectable Corner Vagi
Cut for Channels 44 thru 52.... $16.95
1
wire
8 -pin
SR -SW
Speaker
4x6"
Oval and Prepunched
14 95
Wood Enclosure
82
Misc. Parts Kit Includes Hardware. (6'32
Huts, 6 Bolts), Hookup Wire. Ant Terms OPt1
Ant Switch, Fuse, Fuseholder etc
When Ordering All Items, (1 thin 14), Total Price
9 95
139 95
.
d ACCESSORI
UHF ANTENNAS
SIMPLE SIMON VIDEO
STABILIZER
95
1
14 MISC -SW
VTR ACCESSORIES
00
5
5-pieces
and 14 -pin 2- pieces
13
95
C
33- pieces
5- 65ptd. 6- pieces
STURDY CONSTRUCTION
95
6
25oma
SELECTABLE 75 or 300 Ohm IMPEDANCE
95
5
ohms. 7- paces
Resistor Kit, In Watt. 5% Carbon Film, 32 -pieces
zyzz
VHFUHF WIDEBANO
ANTENNA AMPLIFIER
MODEL ALL-1
Model
-- 900
12 dB GAIN ±
VS-125
Simple Simon Video Stabilizer, Model VS -125,
eliminates the vertical roll and jitter from "copy
guard" video tapes when playing through large
screen projectors or on another VTR. Simple to
use, just adjust the lock control for a stable
picture.Once the control is set, the tape will play
all the way through without further adjustments.
Includes 12V power supply.
VS -125 Video Stabilizer wired
$54.95
Fig. 3. A solid -state pressure -to-
current transducer (149PC) made
by Honeywell's Micro Switch Div.
National's "Pressure Transducer
Handbook." It describes many of National's semiconductor pressure transducers and explains how to use them to
monitor fluid flow, measure altitude,
sense barometric pressure, and detect
both blood pressure and pulse.
Figure 4 is the block diagram of a digital, blood -pressure measuring circuit
(sphygmomanometer) given in National's handbook (Fig. 1, page 9 -2). In this
circuit a microprocessor controls the sequencing of these events: the transducer
is auto -referenced; the cuff around the
patient's arm is inflated; the systolic
pressure is detected, calculated, digitized, and displayed; the cuff is deflated;
and, the diastolic pressure is detected,
calculated, digitized, and displayed. The
o 5dB
A Revolutionary New
One Stage HYBRID
IC Broadband Amplifier
This unit )s ,.
anywhere else in the
serves many p reuses and is available in Ki,
form Ideal for outdoor or indoor use Input -outs
is 75 ohms. Amplifier includes separate rn
supply. Easily assembled in 25 m,mae; No cu,
etc. to tune or adjust.
ALL -1 Complete Kit with power supply ....
ALL -1 Wired and Tested with pov,.er aipnly
:..
,
-
.
$24.95
$34
PP
Our New STVA 14.5 dB GAIN,
14 ELEMENT CORNER REFLECTOR
YAGI ANTENNA
SIMPLE SIMON VIDEO
SWITCHING BOX
Model VSB-300
is
APRIL 1982
MHz
50 MHz
The
w
S1VA -3
Affordable
Yagl Antenna.
14 5 dB, 75 ohm. Chan 60 -66
-'S1VA -4
Video
916.95
Yogi Antenna,
14 5 dB 75 ohm Char. 44 -52
916 95
5 dB 75 ohm Chen 42 -54
SU 95
75 ohm Chaa. 70 -78
S9 95
Control Center!
Excellent in isolation and no loss routing system.
Simple Simons VSB -300 Video Switching Box
enables you to bring a variety of video components
together for easy viewing /dubbing. Also you gain
the ability to record one channel while viewing
another. Unit includes two F -type quick connector
ended cables.
VSB -300 Video Switching Box wired
.... $19.95
Available by Mail Order Only
-
STVA -1 Yogi Antenna.
11
STVA -2 Yagi Antenna,
11 5 dB
66 -59/U
F -59
75 ohm Low Loss Coax Cable
MT -1
Special
ALL -1
HYBRID IC Wideband VHF-UHF -FM Antenna
ALL -1
HYBRID IC Widehand
S
12
p/h
35
Coaxial Connectors. ea
UHF 75
-300 ohm Matching Transformer, to
Amplihe IGt
VW-UHF-FM Ant Amp Assembled
t 45
24 9F
34.95
Send Check or Money Order To.
SIMPLE SIMON ELECTRONIC KITS; Inc.
Calif. Orders:
All Other Orders:
3871 S. Valley View, Suite 12
Las Vegas, Nevada 89103
Tel: (702) 322 -5273
11850 S. Hawthorne, Blvd.
Hawthorne, Calif. 90250
Tel: (213) 675-3347
Minimum Order $16.95 Add 1096 Shipp ^r.
and Handling on orders under $40.0C. Fu,
orders over $40.00. add 5 %. Minimum Ship
ping and Handling $2.00. Catalog $1 00
VISA and Mastercard Acceptable
:
-
-
95
QUALITY parts at
DISCOUNT PRICES:
solid-state developments
4 CHANNEL 8 TRACK
pulse rate is detected by means of an accoupled, low-pass filter.
Articles in POPULAR ELECTRONICS
about medical electronics always elicit
mail from readers interested in additional information. The "Pressure Transducer Handbook" discusses topics such
as: the monitoring of intra- ocular pressure for the detection of glaucoma; pulmonometry for detection of emphysema
and other disorders of the lung; and
methods of monitoring the performance
of the human ear. Rather than writing
this column for more information, obtain a copy of the handbook.
HOME UNIT
BRAND NEW UNITS...
ASSEMBLY INCLUDES;
TAPE HEAD, MOTOR BELT,
110VAC MOTOR, PRE -AMP,
LIGHTS, SWITCHES,
SOLENOID AND OTHER
USEFUL PARTS....
AN EXCEPTIONAL BUY!
$7.25 PER ASSEMBLY
4PDT
RELAY
pm
1.
3
FOUR TERMINAL
CONNECTOR
(\71
alyle
mp
co.2.0[1x
ocl.2.0[1x
r
20
So. ac. COPI
Used bul
fully
leMed
$1.70 EACH
3 TERMINAL
CONNECTOR
MINI SIZE
BUZZERS
SIZE:
3 volts 75tea
WITH PIN TERMINALS
1% to
I
I
LONG
1/8" WIDE, 1 /4"
DEEP NOT INCL.
PIN LENGTH...
75S A PAIR
WITH WIRE LEADS
5/8"
1
i4
CUFF
JOYSTICK
i
3 to 7 volts
WITH PIN TERMINALS
PRECISION
DEVICE...
CONTAINS 4 `` o
50K CENTER ,11
TAPPED ALPS
POTS
75e each
MITSUMI
MODEL UES -A55F
VARACTOR UHF TUNER
a
CONTROL
-`
HEART RATE
$ 4.75 each
FLAT LEVER
MINI -TOGGLE
FREQ RANGE
470 - 885 HHZ
ANTENNA INPUT
;00 OTMS
SRDT (ON -ON)
AMP
120 VAC
COX 0 7105
$1.00 EACH
10 for $8.50
100 for $75.00
5
$ 25.00 each
$220.00
10 for
w
CONVECTOR SET,
30011s75te-
to
PER SET
WEATHER -PROOF, MOLDED
SOCKET, CONNECTOR SET.
specify cOil v011 age
LARGE QUANTITIES AVAILABLE
SnC.ETS FOR RELAY 500 P.c0
oh
$1.50
preeSEND
40 PAGE CATALOG Ftee
COMPUTER
L.E. D.'S
GRADE
STANDARD JUMBO
CAPACITOR
DIFFUSED
700mfd.150VDC $2.0
1/2" DIA X 4 3/4"
2
3,600 mfd.
4ovoc
13/8"
DIA.
RED
GREEN
HIGH
Auk
x
5"
YELLOW
HI
5
$2.50
318` "In X 4 I /412,000mfd. 40 VDC $3.00
60VDC
FOR $1.70
2
2" DIA X 4 1/4" HIGH
BI POLAR L E D
1/2" DIA X 4
SUB MINI LE D
18,000 mfd. 75 VDC $ 4.00
21/2"
.079"X .098"
2OmA at 1.75v
1
FOR $1.00
200 FOR $18.00
10
3.00
5,000 mfd.75 VDC $4.50
2" DIA.
6" HIGH
X
QUANTITY PRICES AVAILACLE
ANNON XLRA-3-13
CONNECTOR
3" DIA X 4 3/8" HIGH
45.000 mfd. 25 VDC
$350
15 VDC
$01).
72,000 mfd.
AMPS
to Fit
CAPACITORS
Wee.
IO
a
6 VOLTS at 150 mA
12 V. C.T. at 500mA
16.5 V. at 3 AMPS
18 VOLTS at 1 AMP
BUZZER SPECIAL!
50 t each
10
SyEt
901
7 clips for $1.00
100 clips for $12.00
clips for $50.00
MICROWAVE
TRANSISTOR
$2.50 EA.
ALL ELECTROAICS
905 S. Vermont Ave.
BOX
P
20406
os Angeles, Calif. 90006
(213) 380.8000
Saturday
Mon. Fri.
')AM -5PM 10AM.3PM
.
$1.25
$2.50
$6.50
$4.50
25.2 VCT at 2.8 AMP $5.50
11/2 VDC
2" ALLIGATOR CLIPS
$2.50 each
120 volt
$11.00
for $4.00
100 for $35.00
F6T5BL
primaries
HIGH X1 1/4" DIA
$1.25 EACH
2' DIA.
W
TRANSFORMER
750 MFD 330 V
PHOTO FLASH ßw,Ó
10 FOR
for $19.00
(ULTRAVIOLET)
G.E.
for $1.50
$7.00
i
BLACK LIGHT
X1748
2
N,
CHASSIS ^t;Jr r
C(NNECTUR
$2.00 EACH
170 MFD 330 VOLT
10 for
PRO!
3
SUPER SMALL
PHOTO -FLASH
.
FOP ;1.70
2
1/2" HIGH
20,000 mfd. 25VDC
HIGH $2.00
2 " DIA. X
22,000 mfd.I5 VDC
2" o!A X 2 /2`.uß $2.00
22,000 mfd. 40VDC
I
52.00
FOR $2.00
10
VOLT OPERATION
JUMBO SIZE
1
2"
51.50
10 FOR
FLASHER LED ,y
6,400 mfd.
2
10 FOR
CORP.
TERMS
Quantities Ltmnyd
Min Order 5,0 00
Add S 2.50
Shipping USA
Calif Re5 Add 6 °.
Prompt Shipping
CIRCLE 840. 4 ON FREE INFORMATION CARD
AUTO REFERENCE
CIRCUIT
Fig. 4. Block diagram of a digital
blood pressure monitor.
Incidentally, in light of the liability
that may be incurred by the manufacture or use of various medical electronic
devices, those of you interested in this
field will certainly want to read National's disclaimer concerning the use of its
products in so- called "life support applications." Their policy can best be
summed up by the following quotation
which appears on page 9-2: "National
Semiconductor Corporation general policy does not recommend the use of its
components of any type in life support
application." Though this statement appears in a book about pressure transducers, note that it covers "components of
any type." Be sure to think about the
implications should you decide to manufacture medical electronic devices.
Several other companies make semiconductor pressure sensors. Recently,
for instance, Motorola (Box 20912,
Phoenix, AZ 85036) entered the market
with two devices. The MPX500 is a
high- sensitivity device capable of sensing from 0 to 7.3 psi. The MPX200D is
a version with a wider range (0 to 29
psi). A news release listed the cost of
these devices as $18 in 100 -unit quantities. Check with a Motorola distributor
or the company for current pricing.
You can find out about other companies that make pressure sensors by consulting the various industrial directories.
If you have no such directories, ask to
see one at the engineering department of
a university, manufacturer, or research
laboratory.
An excellent article on pressure sen-
sors has been published in Electronic
Products magazine ( "Don't Confuse
Pressure Sensors and Transducers,"
Nov. 30, 1981). It gives the names and
addresses of dozens of pressure sensor
makers. You might be able to find this
article in a library.
A New Telephone Receiver. In this
era of increasingly complex electronic
circuits, a new telephone receiver being
experimented with at Bell Laboratories
(600 Mountain Ave., Murray Hill, NJ
07974) is refreshingly simple. The new
receiver, which is designed to fit in the
earpiece of a telephone handset, directly
converts digital signals into audio signals that can be understood by the listener. Conventional digital reception requires a digital -to- analog converter.
I've not yet seen a technical explanation of how the new receiver works. A
Bell Labs photograph of the disassembled receiver shows an electret phone
and a series of three baffles. Apparently
the baffles stretch and thus integrate the
audio pulses from the electret phone.
Therefore, they demodulate the pulsed
signal.
According to J.L. Flanagan of Bell
Labs' Acoustic Research Department,
work is underway to develop a microphone that directly converts speech into
digital signals.
A 125 -Volt Regulator. Texas Instruments (P.O. Box 202129, Dallas, TX
75220) has announced the availability
of a voltage regulator having the highest
output capability yet, the TL783
DMOS regulator. This new chip, which
is installed in a TO -220 package, can
handle an input- output differential of
125 volts! This compares with about 40
volts for previous regulators. The maximum output current of the TL783 is 0.7
amperes.
This new regulator will find widespread application in line -powered circuits. Unfortunately, the temptation to
avoid the use of line -isolation transformers will be great since the new regulator
can function over such a wide range.
Should you choose to use this new regulator, be sure to play it safe and always
use an isolation transformer.
Bubbles are Booming. National
Semiconductor, Texas Instruments, and
Rockwell International may have abandoned the bubble memory business, but
Intel has reported that its bubble business is expanding fast. According to a
recent item in Electronic Engineering
Times, Intel is shipping some 2000 bubble memory units each month. This is
about triple last year's sales figure. The
steady market has led Intel to expand its
bubble manufacturing facilities.
POPULAR ELECTRONICS
feature re vie, y
Popular Electronics Tests
Sooty 1CT2001 Receiver
JòrAM-FM Broadcast and Shortwave
THE Sony ICF -2001 is a compact
portable receiver with the unusually
wide frequency coverage of 150 kHz to
29.999 MHz, plus the 76 -to -108 MHz
FM band (which includes the FM
broadcast frequencies used around the
world), and will also tune 5513 and CW
signals. It is tuned by a digitally controlled PLL synthesizer, with the frequency displayed on an LCD readout.
The ICF -2001 operates from internal
batteries (three "D" cells) or from ac
through an external adaptor (supplied).
With an optional cable asembly, the
radio can also operate from a 12-volt car
battery. In addition to these power
sources, the memory and computer circuits of the ICF -2001 operate from a
pair of "AA" dry cells.
The ICF -2001 has a built -in 4 -inch
speaker, and is supplied with a single
earphone that plugs into a jack on the
side of the receiver, silencing the speaker. A telescoping whip antenna functions on all bands, augmented by an
internal ferrite rod for AM reception
between 360 and 2143 kHz. There are
also terminals for attaching an external
antenna.
The Sony ICF -2001 is housed in a
black plastic case, approximately 121/4"
x 63/4" x 21/4 ". It weighs about four
pounds including batteries. Price: $349.95.
General Description. Unfortunately,
no information is supplied by Sony concerning the circuit details, intermediate
frequencies, or other internal operating
characteristics of the unit. We can see
that slightly more than half of the panel
a three -position BAND SELECTOR SWitCh,
with settings for FM, AM, and SSB/
CW. The latter turns on an internal beat
frequency oscillator (bfo) for reception
of CW and SSB signals.
In the center of the panel are the frequency selector keys, perhaps the most
unconventional feature of the ICF -2001.
Any frequency in the tuning range of
the receiver can be "punched in" like
making an entry on a calculator keyboard. The decimal point is automatically inserted, and the numbers appear
on the display as they are entered. The
actual receiver frequency remains fixed
until a long red EXECUTE button is
pressed, which instantly shifts it to the
selected frequency.
The LCD display indicates by a
"MHz" or "kHz" whether it is in the
FM or AM mode. Although the "direct
tuning" mode is the most convenient for
setting the receiver to a known frequency, it is impractical for covering a band
of frequencies. Therefore, a pair of MANUAL TUNING buttons below the frequency selectors cause the receiver to scan
upward or downward while they are
held down. The stepping rate for the
AM bands is 100 kHz (in -kHz steps)
in about 55 seconds. For FM, the scanning is in 0.1 -MHz steps, and a band of
100 steps (10 MHz) is covered in about
55 seconds. If a center FAST button is
pressed simultaneously with one of the
1
MANUAL TUNING buttons, the scanning
steps are increased to 10 kHz for AM
and 0.2 MHz for FM, covering the same
total range in about 13 seconds.
The ICF -2001 contains a versatile
memory system, one of whose functions
is to allow the receiver to scan continuously between any two frequency limits. The SCAN function is controlled by
four keys to the left of the DIRECT TUNING keys. One limit frequency is selected
manually (while holding in ENTER you
press the L button). Then the other
limit frequency is similarly selected with
the L2 button. Below L2 is a START/
STOP button; one touch on it causes the
receiver to scan from L I to L2, returning to LI and repeating the process until
you deactivate it with the START /STOP
button. The scan is in steps of 3 kHz for
AM, and 0.1 MHz for FM.
Normally the receiver will have tuned
slightly past a signal before the scan can
be halted, but a couple of taps on the
opposite MANUAL TUNING button will
return it to the correct frequency. If the
SCAN AUTO STOP switch on the right side
of the receiver is set to AUTO, the scan
will cease when a sufficiently strong signal is received. After the scan stops, for
any reason, another touch of the START/
STOP button continues the scan from
that point.
The ENTER key is also used to store
station frequencies into a PRESET MEMORY. Up to six frequencies (either AM or
FM) can be stored and recalled at a
touch of the appropriate MEMORY PRE SET button at the right of the display
1
controls and displays, the
remainder being occupied by the speaker and three controls: the POWER switch,
SLEEP timer button, and LIGHT button.
With the POWER off, pressing the
SLEEP button once turns on the receiver,
and a number "90" appears at the upper
right corner of its LCD display panel.
This indicates that the internal electronic timer will shut off the radio automatically after 90 minutes. Each additional
press of the SLEEP button reduces the
"on" period (and the display reading)
by 10 minutes. The third button, when
pressed momentarily, illuminates the
LCD panel with an internal light for
reading it when the ambient light is low.
At the upper right corner of the panel is
is devoted to
APRIL 1982
97
feature review
SAVE!
FREIGHT
TIME
MONEY
QUALITY STEREO EQUIPMENT
AT LOWEST PRICES.
REQUEST FOR QUOTATION RETURNED SAME DAY.
FACTORY SEALED CARTONS
GUARANTEED AND INSURED.
NrYOUR
jk
-
SAVE ON NAME BRANDS LIKE:
PIONEER
JVC
KENWOOD
TEAC
MARANTZ
SANSUI
TECHNICS
SONY
AND MORE THAN 50 OTHERS
BUY THE MODERN WAY
BY MAIL - FROM
i II.noii audio
BANK CARDS ACCEPTED
12 East Delaware
Chicago, Illinois 60611
312-664-0020
800 -621 -8042
CIRCLE NO. 25 ON FREE INFORMATION CARD
SEE YOUR DEALER TODAY
DEMAND THE ORIGINAL
`Fir es
tik'
ANTENNAS
ç ACCESSORIES
LET THE OTHERS
PLAY GAMES!
WE MANUFACTURE
ONLY THE VERY BEST
ANTENNAS!
AM /FM AUTO RADIO
CITIZENS BAND
CORDLESS TELEPHONE
Dealer & Distributor Inquiries Invited
SEND FOR FREE CATALOG
'Flreattk' Antenna Company
2614 East Adams %Phoenix, AZ 85034
Name
Street
City
State
Zip
Serving the CB and
Communications Market Since 1962.
panel. To store a frequency after it has
been tuned in, press the desired button
while holding down the ENTER button. If
one wishes, the L 1 and L2 buttons can
be used for two more preset channels.
Along the bottom edge of the LCD
display, indicators show which PRESET
MEMORY positions have been assigned to
the selected band and whether the scanning limits have been assigned. A row of
five red LEDs to the left of the display
window
indicates relative
signal
strength on all bands. At low and
medium frequencies, the antenna is a
fixed internal ferrite rod, so that it may
be necessary at times to rotate the entire
receiver for best reception. In addition,
the antenna input circuit for all bands
(other than FM) is tunable by means of
a thumbwheel located to the right of the
DIRECT TUNING buttons.
Although the receiver tuning changes
in discrete steps, its i -f bandwidth is
large enough that there is no need to
adjust the tuning between steps, except
when receiving CW or SSB signals. The
latter, in particular, require very precise
tuning for an intelligible output. Therefore, an SSB /CW COMPENSATOR
thumbwheel below the AM ANTENNA ADJUSTMENT varies the frequency of the
receiver's bfo continuously over a ±6kHz range. This control is calibrated at
2 -kHz intervals to show how much
should be added or subtracted from the
digital readout to obtain the true receiver frequency (the digital display is not
affected by this adjustment).
The remaining front panel controls, at
the lower right of the panel, are three
sliders for TONE and VOLUME adjustment. The BASS and TREBLE tone controls have "0" center calibrations and
arbitrary limit calibrations of ± 10.
Set into the right edge of the receiver
case, in addition to the SCAN AUTO STOP
switch, are screw terminals for an external antenna. It functions at all frequencies, and although the telescoping whip
cannot be removed or disconnected, it
folds against the receiver body when fully collapsed. Other than recommending
that 75 -ohm coaxial cable be used for an
external antenna connection, the receiver instructions do not state the impedance of the receiver's "front end" input.
There is also a three -position AM RF
GAIN switch, marked DX, NORMAL, and
LOCAL.
On the left edge of the case are four
jacks. Three are miniature (1 /8 ") phone
jacks for driving an earphone or external
speaker, feeding audio to a tape recorder, and connecting an external timer
(not available from Sony) to turn the
receiver on and off. There is a larger
jack (DC IN 4.5 VoLT) for powering the
receiver from the external power supply
or the 12 -volt adapter cable. The rear of
the ICF -2001 contains separate compartments for the main batteries and the
smaller batteries, and a hinged stand
that tilts the panel upward slightly when
the receiver is placed on a flat surface. A
shoulder strap is furnished with the
radio.
Laboratory Measurements.
All
measurements of the Sony ICF -2001
had to be made through the antenna r -f
input by modulating an AM or FM generator. The output was measured
through the headphone jack, with an Bohm resistive load when power and distortion readings were taken. The receiver was powered from the 120-volt 60 -Hz
ac line through the power- supply adapter for the tests.
The FM tuner had an IHF usable sensitivity of 23 dBf (4 microvolts across 75
ohms). The 50 dB quieting sensitivity
was 24.7 dBf (4.81AV). Limiting was
complete at 35 dBf (15 MV) and at 65
dBf (50001) the noise was 62 dB below
100% modulation. Harmonic distortion
at that input was 0.31 %. The SIGNAL
STRENGTH lights came on at inputs (75
ohm) between 1.4 and 6µV, so that reasonably good FM reception requires
that all the lights be lit.
The FM capture ratio was 4 dB at 45
dBf (50 AV) and 9 dB at 65 dBf. Both
would be considered poor by the standards applied to home high -fidelity receivers, but are probably quite good for
small portable units. The AM rejection
was 38 dB at 45 dBf and 47 dB at 65
dBf. Alternate channel selectivity was a
surprisingly good 65 dB (many lowprice home receivers do not do as well)
and adjacent channel selectivity was
correspondingly good at 9 dB. Evidently
the FM i -f is not 10.7 MHz, since we
could find no trace of an image response
based on that frequency.
In the AM mode, the sensitivity range
of the indicator lights was also unexpectedly high (perhaps to give an impression of greater sensitivity than the
radio actually has). The highest level
light ( #5) required an antenna input of
only 0.85 µV at 10 MHz and 1.75 µV at
1 MHz, but at 200 kHz and 30 MHz
these figures increased to 2.6 and 11 µV
respectively. Aside from the LED indications, the sensitivity for a 10 -dB
S +N /N with 30% modulation was in
the range of 1.2 to 2.2 µV at all frequencies except 200 kHz, where it was 10
microvolts.
The overall frequency response of the
receiver included the tuner and amplifier characteristics, which could not be
separated. With the tone controls centered, the FM tuner response was within
± 3.5 dB from 80 to 20,000 Hz (the low
frequencies rolled off sharply, apparently by design). The BASS tone control had
a slight effect in the midrange (100 to
1000 Hz) but none at lower frequencies.
It boosted the output by a maximum of
2 dB and cut it by 4.5 dB. The TREBLE
control could boost the output above
1000 Hz by as much as 6 or 7 dB, and at
its minimum setting it rolled it off to
-17 dB at 20,000 Hz. The AM frequency response was surprisingly restricted, peaking at 400 Hz and falling
to -6 dB at 190 and 930 Hz. In spite of
this limited bandwidth, AM reception
was perfectly intelligible.
At 1000 Hz, the audio output clipped
at just under 0.6 watts into an 8 -ohm
CIRCLE NO. 18 ON FREE INFORMATION CARD
98
POPULAR ELECTRONICS
-feature review_
CONSTANTLY
BETTER
load. Just below clipping, at 0.5 watts,
the distortion was 3.0% and at 0.1 watts
it was about 1.5 %.
User Comment. These data are pre-
sented simply to provide a basis for comparing the Sony ICF -2001 to more conventional shortwave or FM receivers.
Actually, it is in no way comparable to
any other receiver we have seen, and
should be judged on its own merits.
As a portable AM or FM receiver, the
ICF- 2001 does a fine job. Its sensitivity
is more than adequate on the FM and
AM broadcast bands, and for general
shortwave listening, even with the built in antennas. We did not use the receiver
with external antennas.
The accuracy and stability of the tuning are, of course, those of the quartz
crystal oscillator that controls the synthesizer. It is impressive to set the
receiver to the frequency of any receivable station within its very wide frequency coverage, and have the signal
come in perfectly tuned as soon as the
EXECUTE button is pressed. The tuning
behavior, because of its step -wise scanning, is rather startling. The background noise (sometimes mixed with
signals) is gated on at a regular rate as
the receiver makes its discrete frequency
jumps. The SCAN AUTO STOP only functioned on rather strong stations.
Reception of SSB signals is easy, from
the standpoint of tuning them in properly. As soon as the receiver is within
about 5 kHz of the correct frequency, it
can be fine tuned with the COMPENSATOR. Because of its considerable i -f
bandwidth (compared with communications receivers) it is easy to tune either
USB or LSB signals using just the bfo
(COMPENSATOR) control. The same
property (poor skirt selectivity) makes
reception on crowded amateur bands
difficult at times, but if one learns to
concentrate on the desired signal it is not
too hard to pick one out of many.
The instruction manual warns of internal spurious signals from the synthesizer oscillators at 299, 350, 400, 5760,
10,700, 11,520, and 21,400 kHz. These
were indeed present, at sufficient
strength to obliterate almost any external signal one might find on those frequencies (except for 11,520, which was
only moderately strong).
Obviously the ICF-2001 is a remarkably versatile portable receiver, ideal for
taking on vacation or camping trips. It is
also a fine,introduction to the world of
shortwave listening since its tuning ease
and precision remove one of the major
problems facing a neophyte SWL'(how
to know to which frequency a receiver is
really set, in contrast to what its dial
may read).
If the price of the ICF -2001 seems a
trifle high for a small portable receiver,
try comparing it to allwave or shortwave
receivers covering even part of its range.
It will soon be apparent that this is an
excellent value as well as being a lot of
fun to use. Julian Hirsch
CIRCLE NO. 105 ON FREE INFORMATION CARD
%i
PIONEER
KE5I00
Cassette with
Digital Supertuner
() PIONCER
In Dash
*193
-
AKA.I GXF7I
3
m
VHS 2 -4 -6 Hr.
tÍ:i' *466
Programable
*S39
J VC
STJXS
Digital Quartz
Call For Price
NEWw/Dolby C.
*12
TOLL FREE 800-356-9514
Weekdays 9 -9
Saturdays 9 -5
s
100 Brands like:
Technics
Pioneer
Maxell
Empire
Sony
Teac
Cerwin
Acutex
Vega
Marartz
Kenwood
Altec
Akai
Craig
Scotch
Sharp
Sansul
Phillips
Shure
Dual
Koss
Onkyo
Audio
Jenser
TDK
T120
VHS Video
Tape
*27S
Over
VFT190
Top of the Line
SONY
Jv1,1
Head
RC/1
A9
Technica
Clarion
B.I.C.
Stanton
Pickering
WISCONSIN DISCOUNT STEREU
2417 w. badger rd. madison, WI 53713
608 2716889
CIRCLE NO 48 ON FREE INFORMATION CARD
IlltIntosh
STEREO CATALOG
and FM DIRECTORY
Get all the newest and latest information on the new
McIntosh stereo equipment in the McIntosh catalog. In
addition you will receive an FM station directory that
covers all of North America.
n
r
SEND
O
n
McIntosh Laboratory, Inc.
East Side Staion P.O. Box 96
Binghamton, N.Y. 13904 -0096
PE
NAME
TODAY!
ADDRESS
STATE
ZIP
LCITY
J
If you are in a hurry for your catalog please send the coupon to McIntosh.
For non rush service send the Reader Service Card to the magazine.
CIRCLE NO. 33 ON FREE INFORMATION CARD
APRIL 1982
99
CXPEMCN1ER'S
OkNCR
By Forrest M. Mims
How to Protect Profitable Ideas
Part 2. Notebooks, Lawyers and Patent Applications
HAVE YOU a profitable idea? If so, you should know
how to protect it. Otherwise, your idea may enrich
others.
You should also know, however, that protecting profitable
ideas can be a tricky business. Keeping accurate records of
your idea and building working models.are relatively straightforward procedures, but filing a patent application can be
both time -consuming and expensive. Even if your idea is eventually patented, you must be prepared to protect your rights
by defending it, at your expense, against any infringement.
Therefore, it's important to distinguish merely good and
useful ideas from those that are profitable. Many inventors
have spent thousands of hours and at least as many dollars
securing patent protection for good and useful ideas from
which they have received little or no return.
Let's assume your idea has money- making potential. What
steps can you take to begin protecting your idea now? Should
you seek patent protection for it? Can you sell your idea without patenting it? I'll attempt to answer these and other questions in this column. You should be forewarned, however, that
I am not a patent attorney or an expert on patent law. For
expert advice, you may wish to consult a patent attorney,
about which I'll say more later.
What Is a Patent? Article I, Section 8 of the United States
Constitution lists the powers delegated to the Congress, one of
which is "To promote the Progress of Science and useful Arts,
by securing for limited Times to Authors and Inventors the
exclusive Right to their respective Writings and Discoveries."
Copyrights, trademarks and patents stem from this clause.
According to the Department of Commerce, which oversees
the U.S. Patent and Trademark Office, "A patent is a grant
issued by the United States Government giving an inventor
the right to exclude all others from making, using, or selling
his invention within the United States, its territories and possessions." The term of the patent is seventeen years from the
date on which it is issued. Thereafter anyone may make, use
or sell the invention.
What Can be Patented? Congress has enacted statutes
which govern patents. The law provides that any person who
"invents or discovers any new and useful process, machine,
puff CVO oopoo0a01Op0 0 00000
0 OD 0 EILIOIDOO
0
0
Order 59.00
0
O
CHANEY
0
electronics
Q
Minimum
Please include 51.50 for shipping (UPS)
We accept VISA and MASTERCHARGE
Inc.
i TEACHERS
°
0
O
0
O
0
0
We
O
O
4
0
Q
0
0
0
0
17
`='
Q
D
O
and
;e 0
°
SEND FOR OUR COMPLETE CATALOG OF KITS AND PARTS.
1120VAC VARIABLE STROBE LIGHT KIT
ELECTRONIC WHEEL OF FORTUNE KIT
raw
Complete variable rate strobe fight kit produces brilPush the start button and a bright red ball (LEDS)
O
liant flashes of light. Operates from standard
0
appear to spin around ten numbers When you release
0
12OVAC Reliable design -thousands ofineseare
the button the electronic ball appears to slow down
in use throughout the world Overall size of
'
and finally comes to a stop on one number As the balls
pleted board: 3 "L x 2'1íV e 3"H.
. -,
spins a small speaker emits a ticking sound in synchronization Unit
C3071
S7.50
operates from 9V battery. Size of board. 2.9" o 2.6" C3806
$9.99
3VOC ELECTRONIC WARNING FLASHER KIT
AC FAILURE ALARM KIT
This portable battery operated device continuously
Have you ever been late because the AC went off and your clock radio
emits bursts of intense light at a fixed repetition
didn't work') Well, that need not happen again! Sim10
rate. Can be seen for great distances making it a
) ply plug this unit into the wall outlet and if the AC
_
great safety device. Features xenon tlashtube.Operates
goes off the unit emits a tone. Features green
on 3VDC two
ready light and piezoelectric tone device. Oper5V Batteries). Size of board: 21G "L a 2 "W.
*
C3207 S7.95
ates on 9V battery Size of board: 2.8" a 2 3"
C44B3
$4.75
STROBOSCOPE KIT
10 WATT SIREN KIT
Reliable IC design kit for use in physics experiments or
Kit provides a loud alternatingg one output Uses two IC's and a power
troubleshooting Optically stops motion of fans,
Features variable sound
provide aCeopelaion
wheels. pullys. flywheels. etc The stroboscope
Requires 8 ohm
control and 6 to
control
operation Requires
operates from standard 120VAC and features bright
speaker Size of board 3 5" x
5
xenon flash tube and IC design. Size of board: 3.5" x 4.75"
GO88
55.00
C4070
29.95
`ï/
,,,/
,
i
-
'
Jwi'
i_
V L
`
I
the market. Simply connect to the strobe that will
be used as the slave. When the master strobe
is fired the slave strobe will also flash. Size of
board: 1.5" x 1"
I
I
6.00
:
/I.
o
-
-
FA CINATION STAR KIT
Produces an "exploding star" visual effect using 25
LEDS and IC circuitry The center LED lights first then
tl
lig
ut
the of LEDS
the star another set
lights until the outer edge of the star lights up The
process then reverses itself. Operates from 9V batte._ C4432
510.95
SEQUENTIAL LED FLASHER KIT
This kit combines IC circuitry and 10 jumbo red
OLEDS to produce a unique visual display. LEDS
II
or.;
!,
-
.- a,
`.
.
riD,
.
ION
continuously light sequentially from right to left. Easy to
build31 it Operates from 9V battery Size of board: 5.25" x 1.5 ".
1
",
SOUND EFFECTS GENERATOR KIT
Exciting sound effects kit uses the popular TI76477
chip to develop phasor. locomotive. siren tweeting
bird. organ. Model T. etc. sounds Uses di switch
for simple programming of the generator. Operates
from 9V battery Size of board: 3.25" e 2"
C4422
$12.95
o
_
'....
63
E
S
O
0
0
Q
A
produce
flashing
red light. Operates from 9V battery. Size of
board. 1" x 1.2".
C4484
$4.00
0
0
0
0
0
3CHANNEL COLOR ORGAN
Very popular 3 channel color organ causes lights of your choice to
flash to beat of music. Features level control and 3
separate AC outlets to conned Christmas lights,
mps. etc Operatess from00VVAC. Size of board:
\,.
cS
4b
p0
d
D
OOOO000O000poeDU00poo0000000000000
CIRCLE NO. 8 ON FREE INFORMATION CARD
WARNING!
Electric Power
Pollution,
Spikes,
Interference
& Lightning
HAZARDOUS to
HIGH TECH EQUIPMENT!!
Hi -Fi, Lasers,
MicroComputers, VTR,
Spectrometers are often damaged or disrupted due to Power Pollution.
High Tech components may interact!
Our patented ISOLATORS eliminate
equipment interaction, curb damaging
Power Line Spikes, Tame Lightning bursts
& clean up interference.
Isolated 3-prong sockets; integral Spike/
Lightning Suppressor. 125 V, 15 A, 1875 W
Total, 1 KW per socket.
3 Isolated Sockets;
Quality Spike Suppression; Basic
Protection
$69.95
ISOLATOR.
ISO-1
CI
O
Ip
PHASOR GUN SOUND AND LIGHT KIT
Here's a simple kit which makes an excellect first project. Uses special
3
Q
t4ir`
-J
.,_ IC. darlington transistor and LED to
router space
run" sounder
,s
.
,
'
1
kit on
O
0
o?oo 0
.'
corn-N
PHOTO SLAVE TRIGGER KIT
0
ID
303 -781 -5750
,
Í2J Probably the most sensitive slave trigger
,171
PHONE ORDERS:
AND HOBBYISTS
á
O
0
EXTRA FAST SERVICE
P.O. BOX 27038, DENVER, COLO. 80227
O°
121
ISO-3 SUPER -ISOLATOR.
3
DUAL Iso-
lated Sockets; Suppressor; Corn $104.95
mercial Protection
ISO- 17MAGNUM ISOLATOR. 4 QUAD
Isolated Skts; Suppressor, Labora$181.95
tory Grade Protection
Master-Charge, Visa, American Express
TOLL FREE ORDER DESK 1.800. 225-4876
(except AK, HI, MA. PR & Canada)
SATISFACTION GUARANTEED!
Electronic Specialists, Inc.
South Main Street. Natick. MA 01760
Technical & Non-800 1-617-655-1532
171
CIRCLE NO. 16 ON FREE INFORMATION CARD
POPULAR ELECTRONICS
experimenter's corner
STARTING YOUR OWN
MICROCOMPUTER BUSINESS
manufacture, or composition of matter, or any new and useful
improvements therefore, may obtain a patent."
The definition of "new" is very important. The law provides
that an invention cannot be patented if "(a) The invention
was known or used by others in this country, or patented or
described in a printed publication in this or a foreign country,
before the invention thereof by the applicant for patent, or (b)
The invention was patented or described in a printed publication in this or a foreign country or in public use or on sale in
this country more than one year prior to the application for
patent in the United States." Neither can the invention be
patented if what distinguishes it from previous inventions
Starting your own microcomputer business is easy if you
know the right steps to take. Two volumes of the new book
Your Fortune In The Microcomputer Business describe the
things you should know to start right and to build your
business successfully.
Many people have good ideas for a successful microcomputer
business. But they don't know how to put their ideas into
action. These people are plenty smart. That's not the problem.
The problem is in knowing simple things: How to analyze the
market. How to select the right product or service. How to get
enough startup money. How to plan your growth and success.
The answers to these problems are not hard to understand. All
you need is the right information. Your Fortune In The
Microcomputer Business gives you the knowledge tools to
start right, grow and prosper.
This practical reference manual has no hocus -pocus. It does
not tell you how to do astrology or dating services. It does give
you clear, complete, step -by -step instructions on how to get
started right and insure your success!
Volume I Includes:
would be obvious to a skilled person.
Patent Search. Before spending time and money preparing
a patent application, it is necessary to determine if your idea
is novel. One way to do this is to search through the relevant
literature on all closely related matters at a good technical
library. You should know, however, that the subject of many
patents can be found nowhere but in the patents themselves.
For this reason, if your library search turns up nothing you
should hire a patent attorney to perform a patent search.
In most cases, the attorney will contact an individual or
firm that specializes in patent searches. The searcher will visit
the Search Room of the Patent and Trademark office at Crystal Plaza, 2021 Jefferson Davis Highway, Arlington, VA. He
or she will generally spend several hours or more tracking
down any patents which might anticipate all or part of your
invention. He will forward copies of these patents to your
attorney who will then, in most cases, write you a letter recommending what you should do next. His fee, which includes
the searcher's fee, should not exceed a few hundred dollars.
A search such as this is known as a preliminary novelty
search. Should you elect to apply for a patent, it may be necessary to pay for a complete patent search. This search may
even extend to foreign patents, but even it may not turn up
important pieces of prior art. You may receive a patent, but
years later your patent may be declared invalid should a rival
locate an important piece of prior art.
The hottest trends in the market
The seven best test markets
How to read between the lines at a trade show
107 ways to reach your market
Examples of the best ads in the business
How to get tree advertising
The 21 steps to set up your business
How to start a manufacturing business
Volume
How to write a newsletter
Getting Started
How to give a seminar
How to start a service business
How to package software for the mass market
How to be a highly paid consultant
Franchising -the good, the bad and the ugly
Interviews with six successful microcomputer businesses
How to use the RLC factor to be street smart, lean, mean and successful
I
VILI@I WItO
Keeping a Notebook. Perhaps you've been advised that the
Volume II Includes:
best way to prove the date of your invention is to describe the
idea in a letter which you then seal in an envelope and mail to
yourself. The quaint reasoning behind this practice is that the
postmark on the envelope verifies the date of the contents.
A far more reliable way to establish the date of invention is
to enter a detailed description of your idea in a bound notebook. Never use spiral notebooks or three -ring binders
because their pages can be removed or substituted. Instead,
use a notebook with permanently bound pages.
Each of the pages in this notebook is numbered and printed
with a 0.25 -inch blue grid. Each page includes a yellow second copy. Carbon paper, supplied with the notebook, is
inserted between each page and its yellow second to provide a
carbon copy of your entries. The yellow pages are perforated
and can be removed for safekeeping in a separate location.
Ideas recorded in your notebook should be dated and signed
by you and at least two witnesses. The customary annotation
inserted by witnesses is "Read and understood," followed by a
signature and date. Since I live in a rural area, non -technical
people often sign my notebooks. Therefore, I ask them to
insert a sentence or two briefly describing in simple terms
what they have observed, read, and understood. You should
avoid amending or altering entries in your notebook after they
have been signed and witnessed!
Surprisingly, being first to conceive and log in a notebook a
patentable idea does not guarantee you will receive a patent!
Unless you file your application promptly, a second inventor
who independently conceives the same idea weeks, months, or
even years later may be granted a patent if he exhibits what
the Patent and Trademark Office terms diligence.
Say you invent a widdlewump on January 1, 1983. You
promptly describe your invention in your notebook and have it
witnessed. You then move on to other projects. A year later,
Joe McSecond invents a widdlewump identical to yours. Joe
also records the idea in his notebook. He then goes a step
APRIL 1982
Strategies for growth
Straight facts on incorporation
How to build your organization
How to manage cash flow
How to develop your accounting system
How to manage employees, wages and salaries
How to survive a cash crunch
What to do if things get really bad
How
How
How
How
¡J12
A. I
21 U;1;.: )il 114
iìJUl jl
lÿ.;.t
jJ1Js
Volume II
Growth, Surtival
to maximize your profits
to grow by acquisition
to value your business
and when to sell your business
and Suc:ess
,IL7.6
WAIL
WRITE OR CALL-DON'T WAIT!
Wildfire Publishing, P.O. Box 420 -DM
Carpinteria, CA 93013 Ph. (805) 684-1489
Please send the following book(s) by return mail. I
understand if I want to return them for any reason within 30
days of receipt, I can do so and get a prompt full refund.
Your Fortune In The Microcomputer Business
Vol. I, Getting Started, $20.00. (Postpaid)
Your Fortune In The Microcomputer Business
Vol. II, Growth, Survival and Success, $20.00. (Postpaid)
Calif. residents please add $1.20 each sales tax.
Name
Street
City
Enclosed is
Zip
State
or charge my MasterCharge
or Visa
Card #
Ex. Dt.
L
Signature
MClnterbank
#
e 1982 Wildfire
CIRCLE NO 47 ON FREE INFORMATION CARD
l'ub.
il
experimenter's corner
ent, you should feel free to ask a prospective attorney for references you can contact on your own.
After you select an attorney, make sure he or she explains
in detail any and all expected expenses. You should be given
periodic statements listing the attorney's time and various
out -of- pocket expenses.
If you cannot afford the expenses of filing a patent application, you might be able to convince an attorney to exchange
his time for a share of the invention. Chances are he will
expect you to absorb all filing, search, and out -of- pocket
farther. He expands upon the idea over a period of several
months and subsequently files a patent application.
Coincidentally, you also file a patent application about the
same time. Chances are good that Joe will receive the widdlewump patent. In the view of the Patent Office, your failure
to file a prompt application or exhibit continued interest in the
invention constitutes abandonment of invention. You have
failed to follow the diligence rule. Of course this example is
merely hypothetical. But it does serve to indicate the complexity of patent law.
expenses.
A Working Modal. It's been said that an invention is incomplete until it has been reduced to practice. The Patent Office,
however, rarely requires the submission of working models.
This means you might be able to patent a way of extracting
cheese from moon rocks without having to visit the moon.
Naturally, you would have to convince the examiner who considers your application that your invention would really work
as you claim.
Submitting Your Idea. The
best way to submit an idea to a
company is to send them a copy of your patent and ask if they
are interested in acquiring any or all of the rights.
Submitting an unpatented idea to a company is more
involved. Though many firms will consider unsolicited proposals from outsiders, for their own protection they will ask you
to sign an agreement of nonconfidentiality. In brief, this
means you are submitting the idea openly, not secretly. In the
event they have independently arrived at your idea prior to
hearing from you, the agreement will protect them from any
claims you might later press.
If you read Part I of this two -part series on protecting
ideas, you may recall some of my experiences in submitting
unpatented ideas to manufacturers. Would I again consider
submitting an unpatented idea to a company? Yes, but first I
would make sure my notebook entries were up to date, witnessed, and as complete as possible. I would also make sure
my submission included detailed drawings and a complete
description of the invention. (Do not send a manufacturer
copies of notebook entries or disclose dates of invention! You
should supply this information only after the company has
expressed strong interest and you have received expert advice,
preferably from a patent attorney.)
Retaining a Patent Attorney.
You can find patent attorof most large cities. Another
neys in the telephone directories
way is to obtain referrals by contacting a local bar association.
A patent attorney's services will cost you from $50 to as much
as $200 per hour! Initial consultations, however, should be
free.
As in all professions, not all patent attorneys will live up to
your expectations. They may fail to explain all the fees,
expenses, and charges you will incur when applying for a patent. They may not perform their services as promptly as you
would like. They may even miss a Patent Office deadline.
Therefore, it is a good idea to select an attorney or firm after
first getting references from those who have been previous
clients. If your invention is important and if you anticipate
spending several thousand dollars or more to apply for a pat-
r
r
.
CALCULATOR SAVINGS
AMAZING
DEVICES
®
`+e
i
V
LF] HEWLETT
PACKARD
HP 11C Slim Scientific
HP.12C Slim Finanual
u((( PHASERS )))Ili
a
o
,..,,
o-,.
D igita I
M u Iti ni et e r
The Drake DM2350 Digital
Multimeter Is a
g
convenient, small handheld liquid crystal
display meter ideal for the serviceman
serviceman or
meter eman
auto-ranging.
or in
hobbyist.
This Sea digit
g
Y
auto-zeroing. has polarity indication. and an
over -range warning signal. Battery life is
greater than 300 hours with a "low battery
Indicator. A continuity test sounds a signal
when circuit resistance is less than 20 ohms.
Dc accuracy is a basic 0.8 %.
Batteries. probes. 20 amp current shunt. spare
fuse and soft carrying case all included at $95.95
Add $2.50 Shipping and handling per order
Send check with order and provide street address
for UPS shipment.
Ohio residents add Sales Tax.
p
Charge card buyers may call toll free:
R. L. DRAKE
for
information call:
In Ohio, or
1. 513.866-2421
COMPANY
540 Richard Street Miamisburg, Ohio 45342
INSTITUTIONAL AND DEALER INQUIRIES INVITED
M111111110
CIRCLE NO 14 ON FREE INFORMATION CARD
102
1
U
LASERS
-
Crevice
-
-
RUBY LASER RAY PISTOL
Produces highly tmense rid
m
A hazardous device PLANS PARTS
M om capable of Durng
SOURCES
51fá.00
HIGH POWERED CARBON DIOXIDE BURNING AND CUTTING
Complete pars and au parts sources
$11.01
SOLID STATE IR 12 WATTS with (Twit m power supply
plans
Complete kit with collimator
$0.00
POCKET LASER pulsed.
Compete kit
nsrblered
puns
for RUBY. YAG. NEODYNIUM. NON
NITROGEN and many more Users
sources
-
SNn
MOM
TI
á4l1
LCD Prog
SUPERSENSITIVE PARABOLIC MIKE PLANS
,SOUNDaTELEPHONEOPERATEDTAPERECORDER
$8.00
$7.00
CATALOG ON PLANS KITS 6 FINISHED UNITS
$1.00
Send check or money mdei
tD
SCIENTIFIC SYSTEMS,
AMNERST. N N 8031
o rp.
Qt.
3-n 718
CIRCLE NO. 43 ON FREE INFORMATION CARD
6495
9995
FX4302P Shm Programmable. 512 Steps
FX -702P Handheld Computer. 1680 Steps
FA -2 Cassette Interface for 602/702
roue
DYE
57.00
$10.00
$8.00
109.95
249.95
199.95
Cassette Inn/ -color Printer-Plotter
CE151 4K Memory Expansion for PC -1500
15995
4295
7995
FP-10 Printer for 602/702
MT -31 Compact Musical Keyboard
134 95
15995
MT-40 Keyboard with Bass and Rhythms
44995
C7403 Home Entertainment Keyboard
CT-701 Advanced Electronic Organ with Memory 799 95
CA-85 Calculator Alarm Chronograph Watch .... 34 95
cores
DIRECTIONAL SHOTGUN MIKE PLANS
$14995
29.96
CE -150
X -01
Ultra -thin All Electronic
.Or taster delivery use
or
caNu,
s
rxur ordn a]
Susan' rn avammm,
/S minimumi
add 6-,
ORDER
TOLL-FREE
549951
:.
tact
or mom,
East or Wood u .
Visu tine MC ar.
,
r.
800 -421 -5188
IMMeaflw flee 12171633-3282
taillE
i
9995
13995
19995
Praxis 35 Electronic Portable Typewriter
Seem
1,
7995
S202 Microassette Recorder. One Hour
5802 Two -speed. Two Hour Recorder
5901 Two -speed Compact. Memory Rewind
599.50
PLANS
Steps
CE -122 Cassette Interface/Printer
PC -1500 Advanced Handheld Computer
Purr
LONG RANGE TM
.
.5995
PC -1211 Handheld Computer, 1424
CE -121 Cassette Interface
Dore
548.50
ALL PARTS
ASSEMBLED AND TESTED
'
-.
11-99/40 Console
$36795
7695
Extended BASIC Module
32K Memory Expansion...
28995
P -Code Peripheral for Pascal
29995
Can for low prices on all TI-99/4A products
$12.95
_ .8995
.. 17995
PC-1W 15995
Excekent property protection and intrusion dente
PLANS
5T-oo
911110
T
-- --_
Pal home or onice phone
SNP 2 SNOOPER PHONE
whale on vaatdn aclrvahn8 unnerve nice wdneut phone
ringing
'.
r
' 62 95
Extended Memo y
28795
-HP -07 Card Programmable.
HP -91 Desk Programmable
57995
1769 DO
HP-97 Desk Computer 12%00
82901 M Dual Disc Dr
749 00
HF 85 Desk Computer 199900
B2905Á Dot Matrix Pr
HP 125 Model ID
3748 00
16K Memory Expansion 159 95
CM M Lew Prices et MI Accuseiu one Mew OP-IL Preeoctk
--
SECURITY
.,.
--
5495
I1495
821811AÁ
S6 00
ARGON
118 95
r Program
HP-41C A(Fyun
187 95
HP-41CV (Fun Memory)
23795
16195
82104E Card Reader /41
..29295
82153A Printer /41
92 95
82153A Optical Wand /41
7695
Quad Memory /41C
593 50
use coepNfe puns and parts
$39.50
14295
6295
6895
HP -37E Financial
HP-37E
HP -38C Advanced Financial
TI.58C
TI.59
SEE-ON- IKE-DARK PLANS
1. 800. 543.5813
DRAKE
- Thü
PHASER PAIN FIELD
recently OeVel.
peed and patented m our tabs i3 being evalWted by 4w enforcement agences for not and crowd control n is now avaeabie but
soon wall came under the lunsdretion 01 heapuns and internee
machine control making d uhavarlaDk to the public The deice
is hand -hew and looks like a BUCK ROGERS ray gun It is hazer
d0us it not used with discretion
PLANS
PPF1
$16.00
This
IPG1 INVISIBLE PAIN FIELD GENERATOR
amazing. simple hand-held device is about the size of a pack of
I led a modems
to mien
cigarettes and
sine pain m Me lower pan of the Mad up to a range of 50' De
vice is simple amd
and ecotrdnial
economical to make
544 50
IPG -31( ALL PARTS
IPG -3 PLANS $7.00
IPG -30 ASSEMBLED& TESTED FOR ANIMAL CONTROL S5950
PPE
'
-
5107 95
HPJ2E Scitnuhc
HP33L Programmable
HP.34C Advanced Program
Teo
;.
owe
".
CA Au ..
Teme Inc, Dept. PE -4
14932 Garfield Ave.
Paramount. CA 90723
(2 13) 633 -3262
CIRCLE NO. 45 ON FREE INFORMATION CARD
POPULAR ELECTRONICS
What to do if Your Idea is Misappropriated. First, you
must make sure that misappropriation has actually occurred
before taking remedial action. For example, say you submit
an idea to Ripoff, Inc. Ripoff requires you to sign a nonconfidential disclosure statement and, afterwards, examines your
idea. Ripoff then rejects your idea. A year later, Ripoff
announces a product that appears to incorporate your idea.
Do you have any recourse? Not necessarily. If you failed to
patent the idea, Ripoff may have as much right to it as anyone
else. Also, Ripoff may have independently conceived the idea.
If, however, you are convinced that Ripoff has acted unethically and, perhaps, illegally, you should see a patent attorney.
If, after studying the nonconfidentiality agreement and your
notes and invention suggestion, he feels you have a valid
claim, you may be able to take Ripoff to court. First, however,
ask your attorney to demand a settlement from Ripoff. If they
refuse to discuss the matter, then you have every right to ask
the courts to arbitrate the matter.
Be forewarned, however, that fighting Ripoff in court may
become a very expensive and time -consuming procedure. Be
sure your emotions don't cloud your judgment, for you may
spend thousands of dollars and gain nothing. Equally bad, the
burden of an ongoing lawsuit will hang over you like a dark
cloud. You will think about it constantly. You will have to
stay in close touch with your attorneys (lest they put your case
on their back burner), and you will have to prepare yourself
for the mental and monetary expense of depositions. Is your
idea worth all that? If it is, you should attempt to defend it the
best you can. If Ripoff is a very large company, be prepared
for big expenses. Smaller companies rarely have staff attorneys and are more willing to settle out of court.
You may find that a company's public relations people are
much friendlier than its executives and attorneys. Prior to my
adventure with Bell Laboratories, I thought they were the
world's best laboratory. I still feel that way, but I now know
that the inside of the bell is tarnished by the misrepresentations and rude treatment meted out to my attorneys and me
by a very small minority of an otherwise very likable and
highly professional staff.
During the discovery phase of your lawsuit, you may have
to provide the defendant (the company you have sued) with
numerous records, documents, receipts, and other items. You
will need to find witnesses to testify on your behalf.
In my experience with Ma Bell, my wife and I endured a
humiliating eight -hour search of my home office by three
attorneys from Western Electric and Bell Labs. Though they
had requested specific categories of documents which I was
prepared to provide, they examined such things as my tax
returns, royalty statements, and even personal papers.
So as you can see, tackling a big opponent can be a trying
experience. I'm quite satisfied with the short -term results of
my battle with Bell Labs, since they settled out of court. Several important matters are still unresolved, however.
Negotiating Out of Court. There's not enough space to say
much about this topic, but you may be able to settle a claim
against a company on your own and out of court. I came very
close to settling with Bell Labs before filing suit.
In my experience, Bell Labs failed to take a serious interest
in my claim until I formulated a detailed action plan that
included such options as reporting their claims of having
invented my suggestion to the Federal Trade Commission. I
even managed to interest two congressional committee staffers in my plight, one of whom expressed strong interest.
These out -of-court actions are sometimes known as guerrilla law. They are certainly unconventional. But they seemed to
have a major impact upon high officials at Bell Labs. You
may wish to try such out -of-court tactics, should one of your
ideas be misappropriated. If so, be very certain you know
exactly what you are doing. False claims and accusations may
do harm to a company and its officials, and may leave you the
defendant in a lawsuit.
Additional Information. The Superintendent of Docu-
ments (Washington, DC 20402) sells various pamphlets concerning patents. One is "General Information Concerning
Patents" (750). Another is "Patents and Inventions -An
Information Aid to Inventors" ($1.30). Prices for these documents are subject to change without notice.
You can purchase copies of individual patents from the Patent and Trademark Office (Washington, DC 20231). The fee
is 500 per patent. The patent office will not search out specific
patents on various topics! You must supply the number of the
patent you are requesting.
If you are ever in the Washington, DC area, you can visit
the Public Search Room at the Patent and Trademark Office.
It's located at the Arlington, VA address given above. The
Search Room is a short taxi ride from National Airport. Conducting your own patent search will give you good reason to
admire those who do searches for a living.
You can find out more about patents by consulting a good
library. For hints about submitting an idea to a manufacturer,
send 250 to the American Bar Association (1155 E. 60th St.,
Chicago, IL 60637) and request a copy of "Submitting an
Idea to a Manufacturer."
Finally, while I wish I could help, please don't forward any
technical questions concerning patents and ideas. Your best
recourse is to visit a patent attorney.
0
each new
Deep within
Dual
Technica
Audio
are
cartridge
agfletTM
completely
TWO separate, magnetic
independent magnet,
for
systems. Separate
and coils
pole pieces,
channel.
stereo
each
eVe
the ultimate
Now, to insure
separation,
in stereo
netic barrier
installed a
hegtwo systems.
between
innovative
thoughtful, of every
It's the thong
typical
step
extra
design.
Audio-Technica
Hear the erlence day
á
MuMetalédead
between indep
systems.
t
magnetic
Model AT155LC
illustrated.
103
a
audio technica
CIRCLE NO. 7 ON FREE INFORMATION CARD
APRIL 1982
surance Program, a quality control service. Address: Office of Measurement
Services, National Bureau of Standards,
Washington, D.C. 20324.
tte
NOpS O
S0
otAet
NCW
sI
LflEPATURE
}O 70, Vest Se\eGCNO MINORS
Full Color Catalog Kit
-$2.00
REFUNDABLE WITH YOUR FIRST ORDER
Portable Temperature
Measuring Instruments
Toll Free Nationwide
A 28 -page catalog from Wahl offers an
..4) 1- 800 -321 -6001
MAJOR CREDIT CARDS ACCEPTED
FIREWORKS
UNLIMITED
I8550
224 *
OHIO 44411
ROUTE
DEERFIELD,
'
YOU'LL EXCITE
EVERYONE WITH OUR
BIG AND BRIGHT ASSORTMENTS
'
Software Products
A guide from Lifeboat Associates lists
more than 200 computer programs in 80
Address
City
1
up -to -date listing of precision industrial
thermometers for plant maintenance,
quality assurance, engineering, and energy conservation. The catalog includes
specs and applications for digital heat
probes, thermocouple devices, infrared
scanners, bimetallic thermometers,
chart recorders, etc. Address: Wahl Instruments, Inc., 5750 Hannum Ave.,
Culver City, CA 90230.
State
_
zip
`st.- s>.st.- s>. -s>. -J
PLEASE PRINT TO ASSURE PROMPT CATALOG DELIVERY.
CIRCLE NO. 19 ON FREE INFORMATION CARD
Computer Books
With No Secrets
Computers for Everybody
different formats for business, professional, and personal use. New product
additions include: dBASE II, a relational database manager with its own language suitable for the beginning programmer; PLINK II, a two -pass linkage
editor; Professional Time Accounting
(PTA); MICROSTAT, which is said to
bring mainframe statistical analysis
power to minis; etc. Address: Catalog
#21, Lifeboat Associates, 1651 Third
Ave., N.Y., NY 10028.
Jerry Willis and Merl Miller
This fun-to -read book covers all the
things you should know about computers.
If you're anxious to buy one, use one or
just want to find out about them, read this
book first.
$5.95
171 pages
Small Computers for the
Small Businessman
Nicholas Rosa and Sharon Rosa
If you've ever considered a computer
for your business this is the book that will
arm you with all the information you'll
need to make an intelligent, cost -effective
decision.
$16.95
331 pages
From dilithium Press
have indicated. I understand that if I am not satisfied I may return for full refund.
Computers for Everybody $5.95
Small Computers for the Small
Businessman $16.95
I enclose $
plus $1 to cover
postage and handling.
Please send me your free catalog.
Yes, please send me the book(s)
I
NAME
ADDRESS
CITY, STATE, ZIP
Mail to.
dilithium
Press, P.O. Box 606, Beaverton, OR 97075
CIRCLE NO. 12 ON FREE INFORMATION CARD
104
pe
Video Systems Explained
A consumer information booklet is now
available from the Electronic Industries
Association's Consumer Electronics
Group. Called "Video -Your Window
on the World," the 24 -page booklet
attempts to offer the consumer a full
explanation of video products such as
VCRs, videodiscs, satellite TV, cable,
and interactive TV, e.g., Teletext, Viewdata, etc. There are also sections on
antennas and care of video equipment.
Single copies are free with a stamped
(350) self-addressed envelope. Two to
99 copies are available for 150 each.
Address: Electronic Industries Association, Consumer Electronics Group, 2001
Eye Street, N.W., Washington, D.C.
20006.
Calibrations from NBS
The National Bureau of Standards
(NBS) has issued a new edition of the
agency's complete catalog of calibration
services. Among the areas covered are:
mass and dimensional metrology, mechanics and acoustics, electrical and
electromagnetic quantities, time and
frequency, optical properties, ionizing
radiation, etc. The catalog reflects
changes made since the second quarter
of 1980. Also included is information
about the latest NBS Measurement As-
PC Board
switches
EECO Incorporated has a 16 -page catalog describing its complete line of
printed- circuit board switches. The line
features one- and two -pole, 10- and 16position 2300 Series MICRO -DIP
switches, and the 2400 Series MINI DIP switches which offer standard bottom seal or optional total environmental
seal. The new catalog also contains outline dimensions, terminal identifications, mounting hold patterns, circuit
diagrams, cutaway drawings, switch
orientations, specs, code truth tables,
etc. Address: EECO Incorporated,
Switch Products Marketing, 1601 E.
Chestnut Ave., Santa Ana, CA 92701.
Speaker Kit Catalog
Gold Sound announces a line of 15
Home Loudspeaker Kits, each of which
is described in a catalog available for $2.
Using name -brand drivers, e.g., JVC,
JBL, Audax, etc., each speaker can be
built for one third to one fifth the cost of
a comparable store-bought model, according to the manufacturer. If you
want to build a professional speaker, a
catalog of 21 speaker kits is available for
$3. Address: Gold Sound Loudspeaker
Kits, P.O. Box 141, Englewood, CO
80110.
Power Line Carrier
A brochure from Honeywell describes
the PLC 720 Power Line Carrier system, which is said to eliminate the need
for extensive wiring in the installation of
energy management systems in commercial buildings. By using a building's
existing ac power lines to carry digital
commands to control points, the system
is claimed to lower wiring costs by as
much as 75 %. The microprocessor-
based PLC 720 system also incorporates
a two- function receiver relay that controls two points independently, thereby
reducing the number of relays needed
for a job. Address: Honeywell Inquiries
Dept., MN 12 -4118, Honeywell Plaza,
Minneapolis, MN 55408.
8088 User's Manual
Written for hobbyists and OEMs, this
300 -page book is a design aid for microcomputer systems based on the Intel
iAPX 88/10 8 -bit processor. The chip's
architecture is described from a programmer's point of view. Included are
discussions of the 8/ 16 -bit registers, megabyte memory addressing modes, and
the instruction set. A separate hardware
discussion covers bus timing, direct
memory access, and interface considerations. Also discussed are basic microcomputer concepts, terminology, and
applications. The book costs $7.50. Address: Intel Corp., Literature Dept.,
3065 Bowers Ave., Santa Clara, CA
95051.
POPULAR ELECTRONICS
Sean 8 Roebuck Co., Model 1232 tape recorder. Need
owner's manual or any information available. Mike Melton,
3504 Pageant Dr.. Sacto, CA 95826.
OPCRATK)N
ASS1
Precision Apparatus Co., Inc., series 920 electronamic tube
and set tester. Need schematic, manual and tube adapters
#G -140, A -15, B16. Gus Kroll, 9 Raymo St., Albany, NY
1410 Wolverine, Anchorage, AK 99504.
Navy CRV -59 AAE of ATJ or ATK video camera. Need operator's manual and schematics. Daniel Koller, 19 Bernard Rd.,
Brunswick, NJ 08816.
E.
12209.
Digital Time Device Mark IV clock. Need schematic. Dave
Hoffmann, RR #2, Centerville, IN 47330.
Knight Model R -100A receiver. Need operating manual,
schematic and parts list. Mike Carson, Box 611, Brookings,
OR 97415.
If you need information on outdated or rare equip ment-a schematic, parts list, etc -another reader
might be able to assist. Simply send a postcard to
Operation Assist, POPULAR ELECTRONICS, Park Ave..
New York, NY, 10016. For those who can help readers,
please respond directly to them. They'll appreciate it.
(Only those items regarding equipment not available
from normal sources are published.)
Mallory Model 12RS 140 regulated and filtered power supply.
Need service manual and writing diagram. John W. Shull, Sr.,
Hallcrafters Model SX-110 shortwave radio. Need schematic, service manual and owner's manual. Also same for RCA
Model CRM -P4A-5 CB transceiver. Steve Parkin, 11 Orwell
Spectronlcs Model DD frequency counter. Need schematic
or service data.
RCA Model MI -12188 power amp. Need schematic and operating manual. Also need parta for Gately Prokit Model SM-8
mixer. C.F. McCabe, 519 Lombardy Blvd., Brightwaters, NY
11718.
H.
Morgan,
Box
Close, Red Deer, Alberta, Canada T4N5J2.
10993, Knoxville, TN
37919.
Heathklt Model
1
Cossor Model 1035 MKlll oscilloscope. Need schematic and
manual. Bill Street, 525 E. 9th St., North Vancouver, B.C.
TT1 tube tester. Internal calibration procedure needed. Also the setup steps. Sal Trentino, 1790 Sir
Francis Drake, Fairfax, CA 94930.
Canada V7L 2B8.
Halllcrafters Model SX28A Super Skyrider receiver. Need
schematic and alignment procedures or any other informa-
EMC Model 213 tube tester. Need list of settings for tube
testing. James Hegedus, 109 Longwood Dr., Groveville, NJ
08620.
tion. Mark Higgins, 52 Gilby Rd., Estcourt, 3310, South Africa.
Elco Model HFT -90A FM tuner. Need front end. Nick Meale.
Dumont type 787H oscilloscope. Need operating manual and
schematic. Dawes N. Hiu, 3278 Ala Laulani, Honolulu, Hl
96818.
Military Test Set AN /URM 113 (TS 997/u). Need schematic
Electronic Measurements Corp., Model 300 vacuum tube
Knight Electronics Model KG 686
meter. Need schematic and technical information. John Van Winkle, Rt., 1, Box 69BC. Ft. Gibson, OK 74434.
Gons.t Communicator II. Need service manual, parta list and
schematic. Surplus Collins ARR -15 receiver. Need service
manual and schematic. Ed Wilkie, 2828 W. Charleston, Phoenix, AZ 86023.
Hal8cratters SX -43 receiver. Need instruction manual and
schematic. Also need tube 7F8 or 7F8W. Tim Regen. 15928
Liggett St., Sepulveda, CA 91343.
Symphonic Model TPS30 television. Need 3 inch picture
tube. Gene Vejgrt, OTRS 63050, USAF Academy, CO
and manual. Hal MacArgle, W8MCH, PO Box 201, Grantsville,
WV 28147.
r -f generator. Need operator manual, schematic, and parts. J. Depiere, 222 Lange
Leemstraat, 2000 Antwerp, Belgium.
Litton Business Systems Model 1230 console /printer.
Need schematics and any available information. Bob Reed,
12112 Melody Dr., #301, Denver, CO 80234.
General Radio Model 1001A signal generator. Need service
manual and schematic. A. Reges, 16W761 White Pines, Bensenville, IL 80106.
Fairchild-Dumont Type 304 -A oscilloscope. Need schematic and owner's manuals. Peter Bloch, 791 W. 28th, Eugene,
OR 97405.
80840.
Video Brain computer Model 101A. Need expanders and
cartridges. Dan Taipala, 3970 Parker Rd., Gladwin, MI
48624.
Telequipment Model S32A oscilloscope. Need schematic,
parts list, and any information available. Ray Woods, 130
Waterford, Floriaent, MO 63033.
B&K Model 400 cathode rejuvenator tester. Need operation
manual and wiring diagram. Bill's Bargains, W. 1524
Broadway, Spokane. WA 99201.
HalNdratter. Model HT -41 amplifier. Need tube tí7094.
T.E.
Isaacson, Box 307, Wentzville, MO 63385
Wags Radio Model 809 -1 (1960). Need schematic. John
Okolowicz, 836 Sunnyside Ave., Audubon, PA 19407.
Supreme Model 504 -B set tester. Need any information
available. Richard O. Davidson, 306 Russell St., Carlsbad,
National Model NC173 receiver. Need manual and schematic. Bindu M. Rao, 160 Block East, Jayanagar, Bangalore
580011, India.
I
Scott Console (Andover pre 1970 model). Need detailed
schematic copy. Ed KraMe, 719 Salem Dr., Huron, OH
44839.
Knight Model KG-2100 dc oscilloscope. Need schematic
and service manual. Christian G. Davis, Electricity Electronics, East Central Multi -District, 700 Elm Avenue, Brookings.
3316 Richmond, Cincinnati, OH 45236.
BSA Model 1075 television analyst. Need schematics. Same
for Shiba Model HV 14 CCTV camera. William J. Graft, 2431
Julian, Ft. Wayne, IN 48803.
Webster Model 80-1 wire recorder. Need any available information. Sam Heam, Box 202, DeWitt, AR 72042.
Halllcrefters Model
S -38C receiver. Need schematic diagram or any information available. Carmelo Ortiz, 785 Courtlandt Ave., New York, NY 10451.
RCA CTC24 and KCS160 TV chassis. Need horizontal flyback and section schematics for KRK120, KRK132 and uhf
KRK 127 tuner. Also need CRT pinouts. K. Willes, 5 Grandville
Ave., St. Albert, Alberta, Canada T8NOT5.
Poly Model PC -6 Com 6 -meter transceiver. Need schematic
and owner's manual. Dave Crepar, 825 Eastmont Dr., Gas
City. IN 48933.
Heathklt Model SB -200 linear amplifier. Need operation,
alignment. and service information. Mike Adams, Rt. 4, Box
764, Panama City, FL 32406.
LFE Model 411 oscilloscope with Model 1402 plug -in. Need
schematics, manual, and calibration data. Larry Shannon,
5815 Truscott Terrace, Lakeview, NY 14085.
SO 57006.
Miracle Hill Model 800 automatic transistor checker. Need
schematic or operation manual. E.J. Markusic, 14761 Leon
Pl., Tustin, CA 92680.
Heathklt Model 10 -12 oscilloscope. Need schematic and
service manual. Same for Commercial Controls Corp. Model FPC -5 recorder-producer. William Sinoff, Box 1251, Alham-
Military type ARM -26 radio test set. Need plug
in
modules.
Arthur Kocsi, Route 138, West Kingston, RI 02892.
bra, CA 91802.
Bristol Model KO-3534 car AM /FM digital radio and cassette player. Need service manual. Ralph R. Neuman, 4592
Accurate Instrument Co., Model 151 tube tester. Need
operating manuel. Angel L. Boras, JE -22 Carmelo D. Soler
St.. Levittown Lakes, PR 00632.
Okemos Rd., Okemos, MI 48884.
NM 88220.
Eversonlc Model 10138 AM /FM radio. Need operation manual and schematic. Sammie L. Crawford, Rte. 1, Box A-112,
Appling, GA 30802.
TRS-80M DISCOUNT
PERSONAL COMPUTERS
WE CARRY THE FULL
LINE OF TRS -80's
Hammarlund HO-125X receiver. Need operating manual
end /or circuit diagram. James H. Schwartz, Harmarville
Rehabilitation Center, Inc., Box 11460, Guys Run Road, Pitts-
Webster- Chicago Model 80 -1 or 180-1 wire recorder.
Stromberg -cancan PA amplifier No. 20 and Operedlc Mod-
burgh, PA 15238.
50, Gary SD 57237.
MICRO
MANAGEMENT
SYSTEMS
Drive
Ask About Hard Drives
I
1
5309
$455
$569
$498
WRITE FOR FREE CATALOG
16K
26 -1066 48K
MICRO MANAGEMENT
SYSTEMS, INC.
DEPT NO. i 2
S819
with
Drives, RS232
FREE
COLOR COMPUTER
26 -3003 32K Ext. Basic
26 -3022 Color Drive #
53279
MODEL III
52049
TANDY CORPORATION
COPY OF WARRANTY UPON REQUEST
TM
AT WHOLESALE PRICES
1- 800 -841 -0860
26 -3001 4K
MODEL II
2
BUY DIRECT
26 -3002 16K Ext. Basic
26 -4002 64K
26 -1062
el 1025A PA amplifier. Need schematics. Vemon Blaine, Box
.
'l 1SC
Downtown Plozo Shopping Center
Second Ave. S.W. Cairo, Georgia 31728
912-377.7120 Ga. Phone No
CIRCLE NO. 34 ON FREE INFORMATION CARD
APRIL 1982
105
Dawn The Tube
BY JIM LINDENSMITH
"Either you finish your vegetables, young man,
or you're going to have to watch The Wonderful
World of Disney' on the black -and -white set! "
"Don't tell them we'll come until you make sure
their TV set is working. Last time it wasn't."
106
"How come TV stations never experience
difficulties during commercials?"
"I was afraid of this, doc -your old TV set has
rejected the new picture tube l installed last week "
POPULAR ELECTRONICS
PROW
OTHC MONTH
By Forrest M. Mims
Event-Failure Alarm
AN alarm that sounds a warning a
predetermined time after an
event has taken place (if there has
been no corrective action) has many
applications. Automobile seat -belt alarms are a common example. Others
include: an alarm to indicate that a
refrigerator or freezer door has not
been closed 30 seconds or so after it
was opened; an alarm that works on a
checklist basis to indicate that one or
more actions have not been taken
within a predetermined time period; a
delayed- action alarm that ignores momentary faults (even those lasting up
to a minute or two) but which otherwise functions normally; and a timer
or quick- reaction tester for children's
games or toys.
Adding an Amplifier. Though the
circuit in Fig. will drive a small B-
way to do this is to replace SI with
one of the analog switches in a 4066
as shown in Fig. 3. When the input is
low, the analog switch is open. When
the input is high, the switch's resistance falls from about 109 ohms to a
few hundred ohms or less. This is low
enough to simulate a mechanical
switch for this circuit.
1
ohm speaker at low volume, much
better results are obtained by first
amplifying the tone signal. Figure 2
shows a very simple power amplifier
designed around a low -cost LM386
and little else. Potentiometer RI controls the input signal level and therefore functions as a volume control for
the amplifier.
Adding
Adding
a Logic Input. Many new
applications for the basic circuit in
Fig. become available if the alarm is
reset under digital control. A simple
a
Visual Indicator. Figure
also shows how to add an LED to
3
the circuit. In operation, the LED is
normally off. When the delay time is
up, the LED glows and the alarm
sounds.
1
A Practical Event -Failure Alarm.
Figure is the circuit for a straightforward two -chip, event -failure alarm. The 7555 timer is connected as a
missing pulse detector, and the 4011
quad NAND gate serves as a tone
1
generator.
In operation, the 7555 enters a timing cycle when power is applied to the
circuit. The duration of the cycle is
determined by R2 and Cl. The circuit
may be reset at any time by closing
SI. This turns on QI which, in turn,
discharges Cl. If SI is not closed
prior to the completion of the timing
cycle, the 7555 output goes low, thus
enabling the tone generator.
Only two of the gates in the 4011
are required for the tone generator.
One of the spare gates is used to invert
the enable signal from the 7555 output (pin 3). Pullup resistor R3 allows
this gate to be interfaced directly with
the 7555. The final spare gate in the
4011 provides a buffer between the
tone generator oscillator and an external transducer or amplifier.
Though the circuit I prototyped incorporates a 7555, you can use a standard 555 timer if you prefer. The
chief advantage of the 7555 is its very
low power consumption. You may
also substitute a fixed resistor for R2
when you arrive at a suitable delay
time. Remember that C2 also influences the delay time. Increasing
the capacity of C2 increases the delay
time of the circuit.
APRIL 1982
/O
r
C3
6
/3
.
OS/ 7/
Ss-
/00 k
Fig.
1.
Schematic diagram of an event-failure alarm.
+9V
ro
C3
/)
+9v
(c/G.
1.0 6./C
4-9V
/3
/Ok
z20F
P/N
470
I/P
/N
YOi6
PIN
z
Yo/i
v/suac
7555
/NO/ca72+R
L0B /C
/NpUT
LOG /C /N ACT/ON
o
Fig. 2. A simple amplifier to be
used with the event -failure alarm.
CON T/NUE
RESC
Fig. 3. Adding a logic input
to the event-failure alarm.
107
-m-pak
One -Stop Component Center
This is a partial listing of over 600 items available
from 600 authorized Jim -pak Distributors:
electronic components
Belmont, California 94002
TTL
1,1f.
141110
2/ 85
2/ 85
2/ 85
2/1 19
7400
7402
7404
7406
7407
7408
7410
7414
7417
7420
7447
7474
7475
7476
7485
7486
7489
2/1
2/
74161
1
74164
74174
74175
74192
74193
74367
74393
1
19
2/
2/
89
85
99
10
85
4 19
69
79
69
19
1
2/1
19
2
99
85
85
2 25
2/1 19
69
99
95
95
99
1
1
19
59
59
49
1
1
1
19
19
1
99
95
1
POTENTI OMETERS
DIP JUMPERS AND CABLE ASSEMBLIES
11-14 -1
14 -Pin
1
$2.95
-Foot Single -End (Dip Jumper)
DJ -16 -1
16-Pin
1
-Foot Single -End (Dip Jumper)
3.25
DJ -24 -1
24-Pin
1
-Foot Single -End (Dip Jumper)
3.95
DJ -40 -1
40 -Pin
1
-Foot Single -End (Dip Jumper)
7.95
DJ-14 -1 -14
14-Pin
1
-Foot Double -End (Dip Jumper)
4.25
DJ-16 -1 -16
16-Pin
1
-Foot Double -End (Dip Jumper)
4.95
DJ-24 -1 -24
24-Pin
1
-Foot Double -End (Dip Jumper)
5.95
DJ-40-1-40
40-Pin
1
-Foot Double -End (Dip Jumper)
11.95
DJ-14 -3 -14
14-Pin 3 -Foot Double -End (Dip Jumper)
5.49
DJ-16 -3 -16
16-Pin 3 -Foot Double -End (Dip Jumper)
DB25P -4 -P
D825P
- 4
DB25P-4 -S
DB25P
-
Assembly)
17.95
DB25S -4 -S
DB25S - 4 Foot - DB25S (Cable Assembly)
18.95
5.95
Foot - D825P (Cable Assembly)
4 Foot - DB25S (Cable
Watt a 70 °C
7/8" Slotted Shaft
Linear Taper
1K, 5K, 10K, 25K, 50K,
100K,
1
Meg
CMU
$2.95
DATA BOOKS
JPTTL
JPCML
JPMPD
30001
30003
30005
30009
10400
Description: The JE215 is a Dual Power
Supply with independent adjustable positive and negative output voltages. A separate adjustment for each
of the supplies provides the user unlimited applications
for IC current voltage requirements. The supply can
3/4 Watt @ 70°C
15 Turn Pot.
Linear Taper
100 Ohm, 500 Ohm,
1K, 5K, 10K, 50K,
100K, 500K, 1Meg
General
830P
also be used as
a
supply.
FEATURES:
Adjustable regulated power supplies,
pos. and neg. 1.2VDC to 15VDC.
Power Output (each supply):
5V DC @ 500mA, OVDC @ 750mA,
12VDC @500mA, and
15VDC@ t75mA.
Two, 3- terminal adj. IC regulators
with thermal overload protection.
Heat sink regulator cooling
LED "on" indicator
Printed Board Construction
120VAC input
Size: 3 -1/2 "w x 5- 1/16 "L x 2 "H
$1.79
im- Pak7400 /74LS TTL $3.95
im -Pak
im -Pak
National
National
National
CMOS /Linear
Micro. /Display
CMOS
Linear
TTL logic
Intersil
Intel Component
4.49
3.95
6.95
9.95
9.95
7.95
10.95
55
55
59
1
49
79
79
55
1
79
79
39
4018
1
39
4020
4023
4024
4027
1
39
49
1
19
79
75
4030
4040
4044
4046
4047
4049
4050
4051
4066
1
79
39
1
95
1
2 75
95
409
070
D- Subminiature Plug
D- Subminiature Socket
Cover for DB25P /S
P.C. Edge
BNC Plug
BNC Jack
DB25S
DB51226
22/445E
1
69
59
19
1
95
3.95
4.95
2.25
2.95
2.19
3.95
.59
1.49
1.95
1.95
2.39
1.49
UG88/U
UG89/U
UG175/U UHF Adapter
50239
UHF Panel Recp.
UHF Adapter
UHF Plug
P L258
P1259
BNC Plug
UG 1094/U BNC Bulkhead Recp.
U G 260/ U
IMP LINEAR
LM301 N
.
.
,
.
.
.
.
.
,
.
,
.
.
1.49
.
.
.
.
.
.
.
.
.
.
.
.
LM7905T
LM7912T
LM7915T
LM323K.
LM324N.
LM337T.
LM339N,
.59
1.39
.75
1.19
.
.
LM305H.
LM307N . .
LM308N,
LM309K. .
LM310N,
LM 311N .
LM317T .
LM318N.
LM319N.
LM320K-5.
2.25
2.69
.
.
.
.
.
.
.
.
2.29
2.95
2.95
2.25
1.75
1.75
.
.
,
1.75
.
.
,
5.95
.
.
.
.
.
,
.
.
.
1.29
2.29
1.29
IN
75
4071
4081
4093
4511
CONNECTORS
D B25 P
JE215 Adj. Dual Power Supply Kit
79
89
59
1
LM7805T
LM7812T
LM7815T
1.75
.
L75
1.75
LM380N.
LM384N,
LM555N.
LM556N
LM565N.
LM566N.
LM567N.
LM723N.
LM741N.
L49
LM1310N
LM1458N
LM1488N
LM1489N
LM1800N
2.49
.69
1.49
1.95
1.95
1.79
.79
.65
2.95
.99
1.59
1.59
4.49
76477N
3 95
.
.
general all- purpose variable power
1
CMOS IMP
4000
4001
4002
4006
4009
4010
4011
4013
4016
4017
(as
shown)
.
.
$24.95
JIM -PAK
KITS
JE701
JE730
JE200
JE205
JE210
JE212
JE215
JE300
JE305
JE600
JE610
JE701
JE730
JE747
JE2206B
Amp Regulated Power Supply Kit
Multi -Voltage Board Kit (Adapts to JE200)
5 -15v / .5 -1.5 Amp Regulated Power Supply Kit
Neg. 12VDC Adapter Board Kit (for JE610)
Adjustable Power Supply Kit (Pictured above center)
5V
1
Digital Thermometer Kit
Solar Cell Panel Kit
Hexadecimal Encoder Kit
ASCII Encoded Keyboard Kit
6-Digit (.300 ") Clock Kit (Pictured above right)
4-Digit (.357 ") Clock Kit (Pictured above left)
6-Digit (.630 ") Clock Kit
Function Generator Kit (Pictured below right)
Ceramic Disc. Capacitors
88101
Mylar Capacitors
Electrolytic Capacitors
GB102
GB103
GB107
GB108
GB109
GB110
GB113
G8116
GB117
GB120
GB123
68127
GB137
GB139
GB140
GB141
GB145
GB147
GB154
GB162
GB165
GB173
GB175
GB177
Tantalum Capacitors
Silicon Diodes (1N914/1N4148)
TTL Series Integrated Circuits
Linear Integrated Circuits
Assorted LEDs
Miniature Trimmer Pots.
1/4 Watt Resistor Assortment
1/2 Watt Resistor Assortment
Miniature Slide Switches
Heat Sinks Assortment
Transistors Plastic /Power
Chokes, Coils and Inductors
3 -8 Terminal Solder /Screw Type
Spacers, Standoffs, Insulators
Washers and Spacers
Lugs, Crimp On
Nuts, Screws, etc.
Hardware Mix
1 & 2 Watt Resistor Assortment
Displays
7- Segment
Toggle, Rocker, Push Button Switches
U Test & Sort 3/8" Potentiometers
1 & 3 Amp Silicon Rectifiers (Diodes)
Assorted 1" pieces
Shrink Tubing
-
-
(100)
(60)
(60)
(40)
(100)
(50)
(30)
(100)
(30)
(200)
(200)
(25)
(30)
(100)
(50)
(40)
(150)
(200)
(100)
(500)
(100)
(50)
(40)
(100)
(100)
(200)
CIRCLE NO 29 ON FREE INFORMATION CARD
108
$14.95
12.95
19.95
9.95
24.95
39.95
39.95
59.95
79.95
19.95
14.95
29.95
19.95
GRAB BAGS
08100
74L500
74 L502
74 L504
74L510
74LS14
74L530
74LS32
74LS38
74 LS42
1
741_547
LS48
74LS73
74LS74
74L575
74 LS85
74LS90
74
$2.95
4.95
4.95
4.95
2.95
4.95
4.95
5.95
4.95
2.95
2.95
3.95
3.95
3.95
3.95
3.95
2.95
2,95
2.95
5.95
2.95
5.95
10.95
5.95
3.95
3.95
1
29
1
29
1
79
1
75
69
75
49
7l706
74LS109
74LS123
74LS138
74L5139
74LS154
74LS157
55
55
69
55
55
09
55
69
69
741_508
1
95
1
LS174
74LS175
74LS192
74 LS193
74 LS221
74 LS244
1
19
1
29
19
1
1
1
,
1
1
3
.
19
49
49
49
89
1
L5245
LS367
LS374
LS97
74
74
74
81
1
75
49
29
29
1
LS 161
74
74
89
16.95
JE215 Adjustable
Dual Power Supply
2
Schottky
LS
7490
7493
74100
74109
74121
74123
74150
74154
74157
2/1
TM
.
49
89
L95
.
2 29
SOCKETS
Low Profile
pin LP
pin LP
pin LP .
pin LP
20 pin LP
22 pin LP
24 pIn LP
28 pIn LP
36 pin LP
40 pin LP
8
14
16
18
.
.
.
.
.
.
.
2/.59
2/.69
.
2/.79
.
2/.89
.
2/.99
.2/1.09
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.79
.82
.99
1.19
Wire Wrap
pin WW tin
.75
pin WW gold 1.09
.79
pin WW tin
pin WW gold 1A9
24 pin WW gold 1.69
40 pin WW gold 2.75
14 p. plug /cover 1.29
16 p. plug /cover 1.39
24 p. plug /cover 1.95
Also, The Molex Line
14
14
16
16
DIODES & TRANSISTORS
2/
2/
N751
N757
N1188
N3600
N4001
N4004
2N2219A.
2N2222A.
2N2907A.
59
59
2 69
5/
4/
4/
4/
N007
N4148
N4733
N4734
N4735
.2/1.19
.
2/.89
.
.
.
.
.
.
2N3055
2N3772
2N3904
2N3906
2N4401
2N4403
2N5129
2N5139
99
59
69
79
10/ 99
2/ 69
2/ 69
2/ 69
3/119
3/199
N5401
N5408
.
2/
89
99
2 25
TIP29A
TIP31A
2/
2/
2/
2/
2/
2/
69
69
79
79
69
69
89
99
.
CAPAC (TORS
ELECTROLYTIC
3/.69
lmfd @50V
Dipped Tantalum
.lmfd @35V
47mfd @35V
lmfd @35V
2.2mfd @25V
3.3mfd @25V
4.7mfd @25V
l0mfd @25V
33mfd @25V
2/.89
4.7mfd @50V
2/.89
2/.89
2/1.09
l0mfd
2/1.19
2/1.39
1.19
.lmfd
.22mfd
lOpf- .022mfd
.047mfd
.lmfd
MICROPROCESSORS
Z80A
1173AN -1
8080A
.59
.69
1.19
1.39
50V CERAMIC
4/.79
4/,89
4/.99
4/1.19
4/1.29
.022mfd
.047mfd
2/.59
2/.69
2/.79
2/.89
1000mfd @25V
2200mfd @16V
3.95
100V MYLAR
.001- .Olmfd
@50V
22mfd @50V
47mfd @50V
100mfd @50V
220mfd@50V
CPU (4MHz)
30Tune Musical MPU Chip
CPU
4/.59
4/.69
4/.79
13.951
8.95
Bit I/O Port
BI- Directional Bus Driver
Character Generator
Tri -State Hex Buffer
6.95
3.95
4.49
12.95
2.25
8T97
6.95
AY -5-1013 30K Baud UART
11.95
Keyboard
Encoder
AY -5- 2376 88-Key
2114 -2
3.95
4K Static RAM (200ns)
16K Dynamic RAM (250ns) 3.95
MK4116
5.95
8K EPROM
2708
9.95
2716
16K EPROM (+5V)
8212
8216
2513/2140
8
Function Generator Kit
Provides 3 basic
waveforms: sine,
triangle and square
wave. Freq. range
from 1 Hz to 100K
Hz. Output amplitude from 0 volts
to over 6 volts
(peak to peak).
a 12V supply
or a ±6V split supply. Includes chip,
P.C. Board, corn ponents & instructions.
Uses
JE2206B ...$19.95
,
POPULAR ELECTRONICS
1
A REMARKABLE MAGAZINE
creative
compJtÏR*
"The beat covered by Creative Computing
is one of the most important, explosive and
fast-changing. " -Alvin Toffler
David Ahl, Founder and
Publisher of Creative Computing
You might think the term "creative computing" is a contradiction. How can something as precise and logical as electronic
computing possibly be creative? We think
it can be. Consider the way computers are
being used to create special effects in
movies -image generation, coloring and
computer - driven cameras and props. Oran
electronic "sketchpad" for your home
computer that adds animation, coloring
and shading at your direction. How about a
computer simulation of an invasion of killer
bees with you trying to find a way of keeping them under control?
Beyond Our Dreams
Computers are not creative per se. But
the way in which they are used can be
highly creative and imaginative. Five years
ago when Creative Computing magazine
first billed itself as "The number 1 magazine of computer applications and software," we had no idea how far that idea
would take us. Today, these applications
are
becoming so broad,
so
all encompassing that the computer field will
soon include virtually everything!
In light of this generality, we take "application" to mean whatever can be done with
computers, ought to be done with computers or might be done with computers. That
is the meat of Creative Computing.
Alvin Toffler, author of Future Shock and
The Third Wave says, "I read Creative Computing not only for information about how
to make the most of my own equipment but
to keep an eye on how the whole field is
emerging.
Creative Computing, the company as
well as the magazine, is uniquely lighthearted but also seriously interested in all
aspects of computing. Ours is the magazine of software, graphics, games and simulations for beginners and relaxing professionals. We try to present the new and important ideas of the field in a way that a 14year old or a Cobol programmer can underAPRIL 1982
stand them. Things like text editing, social
simulations, control of household devices,
animation and graphics, and communica-
tions networks
Understandable Yet Challenging
As the premier magazine for beginners, it
is our solemn responsibility to make what
we publish comprehensible to the newcomer. That does not mean easy; our
readers like to be challenged. It means
providing the reader who has no preparation with every possible means to seize
the subject matter and make it his own.
However, we don't want the experts in
our audience to be bored. So we try to
publish articles of interest to beginners and
experts at the same time. Ideally, we would
like every piece to have instructional or
informative content -and some depth
even when communicated humorously or
playfully. Thus, our favorite kind of piece is
acessible to the beginner, theoretically
non -trivial, interesting on more than one
level, and perhaps even humorous.
David Gerrold of Star Trek fame says,
"Creative Computing with its unpretentious, down -to -earth lucidity encourages
the computer user to have fun. Creative
Computing makes it possible for me to
learn basic programming skills and use the
computer better than any other source.
-
Hard -hitting Evaluations
At Creative Computing we obtain new
computer systems, peripherals, and software as soon as they are announced. We
put them through their paces in our Software Development Center and also in the
environment for which they are intended
home, business, laboratory, or school.
Our evaluations are unbiased and accurate. We compared word processing printers
and found two losers among highly promoted makes. Conversely, we found one
computer had far more than its advertised
capability. Of 16 educational packages,
-
only seven offered solid learning value.
When we say unbiased reviews we mean
it. More than once, our honesty has cost us
an advertiser -temporarily. But we feel
that our first obligation is to our readers and
that editorial excellence and integrity are
our highest goals.
Karl Zinn at the University of Michigan
feels we are meeting these goals when he
writes. "Creative Computing consistently
provides value in articles, product reviews
and systems comparisons ... in a magazine
that is fun to read."
Order Today
When you order an introductory subscription
to Creative Computing, you'll save as much as
33 %. One year (12 issues) costs $19.97 -20%
off. Two years go for $36.97, or 26% off. And
three years cost $49.97 -a 33% saving. All
savings are based on the full one -year subscription price of $24.97.
Foreign orders: Add $5 a year for Canada.
Add $10 a year (cash payment in U.S. currency
only) for all other countries outside U.S. and
possessions.
Please allow 30 to 60 days for delivery of your
first issue. We guarantee your complete satisfaction or we will refund the full amount for all
the unmailed issues remaining in your subscription.
To order, make your check payable to Creative Computing and mail it to the address
below -today!
creative
corrtpvtiRg
P.O. Box 5214
Boulder, Colorado 80322
J
10&
FOR
LESS
$3.00 A MONTH
THAN
.
YOU
.
.
.
CAN BUY AT THESE PRICES TOO!
For an annual membership fee, which is currently $35.00, you too can join thousands of others who have discovered this new approach to mail order marketing, because:
-INSTEAD OF mailing several thousand catalogs, every few months, to people with little or no interest in buying through mail- order, EBC will
send its members a personalized 3 -ring binder with hundreds of pages of specifications and pricing for more than 3500 items in stock.
-INSTEAD OF re- issuing, every so often, the same catalog with only a few minor changes, you will only receive, on a quarterly basis, updates
containing information on new items and revisions on current ones.
-INSTEAD OF having the customer pay for the expensive cost of regular monthly advertising and mass distribution of catalogs, EBC members
pay the lowest possible prices for their electronic needs, oftentimes recovering the full cost of their annual membership from the savings
realized through their first order.
In addition to what is listed here, we stock the complete lines of AP PRODUCTS, OK MACHINE & TOOLS, VECTOR ELECTRONIC
COMPANY, Pre -stripped Wrapping Wire in 6 colors and 15 lengths, Resistors, Capacitors, IDCs, Linear ICs, LED Lamps and Displays, LCDs,
Micro -Computers and Peripheral Devices, with thousands of additional items to be offered in the near future, ALL AT SUPER LOW PRICES!
COMPARE OUR PRICES AND JOIN EBC TODAY by calling 800 -325 -0101. You can place your first order at the same time and charge it all
to your MASTERCARD or VISA, or authorize us to ship C.O.D. Our 30 -Day money -back Guarantee will assure you that you cannot go wrong!
DIGITAL
74x x
7400
S 0.15
7401
0.15
0.15
0.15
0.17
0.17
0.20
0.20
0.17
0.17
0.15
0.17
0.17
0.24
0.35
0.19
0.19
0.15
0.17
0.18
0.18
0.18
0.18
0.15
0.18
0.18
0.18
0.18
0.15
0.60
7402
7403
7404
7405
7406
7407
7408
7409
7410
7411
7412
7413
7414
7416
7417
7420
7421
7423
7425
7426
7427
7430
7432
7437
7438
7439
7440
7441
7442
7443
7444
7445
7446
7447
7448
7450
7451
7453
7454
7459
7460
7470
7472
7473
7474
7475
7476
7480
7482
7483
7485
7486
7489
7490
7491
7492
7493
7494
7495
7496
7497
74104
74107
74109
74120
74121
74122
74123
74125
74126
74132
74141
74145
0.31
0.50
0.50
0.50
0.46
0.46
0.46
0.15
0.15
0.15
0.15
0.15
0.15
0.21
0.21
0.21
0.21
0.27
0.21
74147
74148
74150
74151
74152
74153
74154
74155
74156
74157
74158
74160
74161
74162
74163
74164
74165
74166
74167
74170
74173
74174
74175
74176
74177
74178
74179
74180
74181
74182
74184
74185
74188
74190
74191
74192
74193
74194
74195
74196
74197
74198
74199
74221
74251
74279
74283
74290
74293
74298
74365
74366
74367
74368
S 0.89
0.62
0.54
0.32
0.32
0.32
0.53
0.32
0.38
0.38
0.38
0.48
0.48
0.48
0.48
0.51
0.51
0.54
1.06
0.84
0.58
0.41
0.40
0.47
0.47
1.00
1.00
0.48
1.02
0.48
1.06
1.06
2.10
0.50
0.50
0.50
0.50
0.48
0.36
0.47
0.47
0.63
0.63
0.40
0.57
0.50
0.99
0.54
0.54
0.50
0.36
0.36
0.36
0.36
0.41
1.08
0.47
0.20
0.22
0.60
0.24
0.27
0.35
0.30
0.30
0.35
0.53
0.45
74Cx x
74C00
74CO2
74C04
74C08
74C10
74C14
74C20
74C30
74C32
74C42
74C48
74C73
74C74
74C76
74C83
74C85
74C86
74C89
74C90
74C93
S 0.20
0.20
0.20
0.20
0.20
0.46
0.20
0.20
0.20
0.72
0.96
0.46
0.46
0.44
0.89
0.89
0.23
2.15
0.71
0.71
$ 0.82
0.44
1.37
2.04
1.37
0.71
0.71
0.71
0.71
0.71
0.77
0.65
0.65
0.65
0.72
0.72
0.71
4.08
0.96
0.34
0.34
0.34
0.34
5.10
0.34
0.34
0.76
1.38
3.27
0.72
0.89
3.90
3.90
3.90
3.90
0.35
0.35
0.35
0.35
74Fx x
74 F00
74F02
74F04
74F08
74F10
74F1
t
74F20
74F32
74F64
74 F74
0.22
0.34
0.50
0.20
0.95
0.30
0.36
0.30
0.30
0.38
0.34
0.38
74C95
74C107
74C151
74C154
74C157
74C160
74Ct61
74C162
74Ct63
74C164
74C165
74C173
74C174
74C175
74C192
74CI93
74C195
74C200
74C221
74C901
74C902
74C903
74C904
74C905
74C906
74C907
74C908
74C909
74C910
74C914
74C918
74C925
74C926
74C927
74C928
80C95
80C96
80C97
80C98
74F86
74F109
74F138
74F139
74F151
74F153
74F157
74F158
74F164
74F175
74F181
74F182
74F190
74F191
74F194
74F241
74F243
74F244
74F251
74F253
74 F257
74F350
74 F352
74F353
74F373
S 0.39
0.39
0.45
0.39
0.39
0.39
0.39
0.39
0.39
0.44
0.58
0.81
0.87
0.87
0.87
0.87
0.87
0.87
1.35
1.35
2.90
1.50
2.36
2.36
1.17
2.78
2.78
1.80
0.94
0.94
0.94
2.10
0.94
0.94
2.34
INTEGRATED
74F374
74E521
74F533
74F534
S 2.34
2.04
2.34
2.34
74LSx x
74LS00
74LS01
74LS02
74LS03
74L504
74LS05
74L508
74L509
74LS10
74LS11
74L512
74LS13
74L514
74LS15
74LS20
74LS21
74LS22
74LS26
74LS27
74L530
74L532
74LS33
74LS37
74LS38
74LS40
74L542
74L547
74L548
74L549
74LS51
74LS54
74L555
74LS73
74LS74
74LS75
74L576
74LS78
74LS83
74L585
74L586
74L590
74LS92
74LS93
74L595
74L5107
74L5109
74LS112
74L5113
74L5114
74LS122
74LS123
74LS125
74LS126
74LS132
74LS133
74L5136
74LS138
74LS139
74LS151
74L5152
74LS153
74LS154
74L5155
74LS156
74L5157
74L5158
74LS160
74LS161
74LS162
74LS163
$ 0.15
0.15
0.15
0.15
0.17
0.17
0.16
0.16
0.15
0.17
0.17
0.21
0.35
0.15
0.15
0.15
0.15
0.18
0.16
0.15
0.17
0.32
0.18
0.18
0.15
0.37
0.60
0.51
0.54
0.15
0.15
0.15
0.21
0.21
0.29
0.23
0.24
0.40
0.54
0.24
0.33
0.33
0.33
0.40
0.22
0.22
0.24
0.24
0.24
CIRCUITS
74LS164
74LS165
74LS168
74LS169
74L5170
74LS173
74LS174
74LS175
74LS181
74LS190
74L5191
74L5192
74LS193
74L5194
74L5195
74L5196
74LS197
74L5221
74L5240
74LS241
74LS244
74LS245
74L5247
74LS248
74LS251
74LS253
74LS257
74LS258
74LS259
74L5260
74LS266
74LS273
74LS279
74LS283
74L5290
74L5293
74L5295
74L5298
74LS352
74LS353
74LS365
74LS366
74L5367
74LS368
74LS373
74L5374
74L5375
74LS377
74LS378
74LS379
74LS386
74LS390
74LS393
74LS395
74LS447
74L5490
74LS670
$ 0.51
0.51
0.57
0.57
0.84
0.54
0.35
0.35
1.36
0.58
0.56
0.56
0.56
0.64
0.40
0.56
0.56
0.58
0.63
0.63
0.63
0.63
0.59
0.59
0.40
0.48
0.41
0.41
0.94
0.21
0.27
0.88
0.29
0.47
0.58
0.58
0.54
0.54
0.58
0.58
0.33
0.33
0.33
0.33
0.80
0.80
0.56
0.80
0.70
0.70
0.28
0.68
0.68
1.05
0.37
1.02
1.14
0.41
0.47
0.33
0.33
0.42
0.26
0.26
0.45
0.45
0.36
0.36
0.36
0.72
0.41
0.41
0.41
0.41
0.51
0.51
0.51
0.51
74Sx x
74500
74501
74502
74503
74504
74505
74508
74509
74510
74511
74515
74520
74521
74522
74530
S 0.23
0.23
0.23
0.23
0.24
0.24
0.24
0.24
0.23
0.23
0.23
0.23
0.24
0.23
0.23
74532
74540
74550
74551
74560
74564
74565
74574
74576
74578
74586
745112
745113
745114
745132
745133
745134
745135
745138
745139
745140
745151
745153
745157
745158
745161
745174
745175
745181
745182
745189
745194
745195
745206
745240
745253
745257
745258
745280
745289
745387
93500
93505
93510
93512
93516
93541
93S42
93543
93546
93562
$ 0.28
0.24
0.24
0.24
0.24
0.24
0.24
0.36
0.36
0.36
0.36
0.36
0.36
0.36
0.52
0.23
0.24
0.42
0.74
0.74
0.26
0.66
0.66
0.66
0.66
1.48
0.87
0.87
2.73
0.82
1.83
1.07
1.07
2.48
1.29
0.63
0.60
0.60
1.14
3.05
2.54
1.08
1.25
1.88
0.74
1.85
2.73
0.82
3.24
0.84
1.44
4x x x
4000
S 0.20
4001
0.17
0.17
4002
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
0.61
0.20
0.57
0.27
0.27
0.17
0.17
0.30
0.50
0.50
0.28
0.54
0.49
0.27
0.58
0.48
0.56
0.17
0.40
0.17
1.20
0.36
4028
4029
4030
4031
4034
4035
4040
$ 0.45
0.58
0.23
1.12
1,30
0.65
0.58
4041
0.54
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4060
4066
4068
4069
4070
0.51
4071
4072
4073
4075
4076
4077
4078
4081
4085
4086
4089
4093
4099
4502
4503
4507
4508
4510
4511
4512
4516
4518
4519
4520
4527
4528
4539
4555
4556
4582
4584
4702
4703
4704
4705
4706
4720
4723
4724
4725
40014
40085
40097
40098
40106
40160
40161
40162
40163
40174
40175
40192
40193
40194
40195
0.54
0.51
0.64
0.63
0.64
0.28
0.28
0.28
0.54
0.54
0.54
0.59
0.27
0.21
0.17
0.20
0.17
0.17
0.17
0.17
0.53
0.30
0.24
0.17
0.39
0.39
1.07
0.36
0.80
0.27
0.36
0.42
1.49
0.59
0.53
0.53
0.59
0.59
0.30
C.54
0.71
0.63
0.53
0.46
0.46
0.59
0.39
3.87
4,50
3.98
5.04
5.32
5.32
0.78
0.78
2.15
0.39
0.89
0.38
0.38
0.39
0.71
0.71
0.71
0.71
0.65
0.65
0.72
0.72
0.71
0.71
DIODES
DEVICE
TYPE
1N270
TRANSISTORS
&1
10
1N914
1N4001
1N4002
1N4003
1N4004
1N4005
1N4006
1N4007
1N4148
2N2218
2N2218A
2N2219
2N2219A
2N2220
2N 2221
2N2221A
2N2222
2N2222A
2N2369
2N2369A
2N2484
2N2904
2N2904A
2N2905
2N2905Á
2N2906
2N2906A
2N2907
2N2907A
2N3019
2N3704
2N3903
2N3904
2N3905
2N3906
2N4033
2N4123
2N4124
2N4400
2N4401
2N4402
2N4403
MPS2222
MPS2222A
MP52369
MPS2907
MPS2907A
MPSA42
MPSA43
MPSA92
MPSA93
PRICE PER
100
1000
510.80
$90.00
$1.30
0.26
0.49
0.52
0.55
0.58
0.64
0.70
0.80
0.26
3.17
3.46
3.17
3.46
2.60
2.60
2.67
2.60
2.67
2.60
2.67
2.60
3.17
3.46
3.17
3.46
2.60
2.67
2.60
2.67
3.17
0.87
0.87
0.87
0.87
0.87
4.76
0.87
0.87
0.87
0.87
0.87
0.87
0.87
0.94
0.87
0.87
0.94
2.67
2.60
2.67
2.60
2.10
4.08
4.32
4.56
4.80
5.28
5.76
6.60
2.10
26.40
28.80
26.40
28.80
21.60
21.60
22.20
21.60
22.20
21.60
22.20
21.60
26.40
28.80
26.40
28.80
21.60
22.20
21.60
22.20
26.40
7.20
7.20
7.20
7.20
7.20
39.60
7.20
7.20
7.20
7.20
7.20
7.20
7.20
7.80
7.20
7.20
7.80
22.20
21.60
22.20
21.60
SOLDER -TAB
NO. OF
PINS
8-PIN
14-PIN
16-PIN
18-PIN
20-PIN
22-PIN
24-PIN
28-PIN
40-PIN
44>
17.50
34.00
36.00
38.00
40.00
44.00
48.00
55.00
17.50
220.00
240.00
220.00
240.00
180.00
180.00
185.00
180.00
185.00
180.00
185.00
180.00
220.00
240.00
220.00
240.00
180.00
185.00
180.00
185.00
220.00
60.00
60.00
60.00
60.00
60.00
330.00
60.00
60.00
60.00
60.00
60.00
60.00
60.00
65.00
60.00
60.00
65.00
185.00
180.00
185.00
180.00
SOCKETS
PRICE PER
10
$0.09
0.10
0.11
$0.79
0.13
0.15
0.16
0.17
0.20
0.29
0.91
1.00
1.17
1.29
1.38
1.52
1.82
2.58
100
$ 7.15
8.25
1000
65.00
75.00
82.50
96.25
106.25
113.45
125.00
150.00
212.50
$
9.08
10.59
11.69
12.48
13.75
16.50
23.38
Hitachi Denshi, Ltd.
OSCILLOSCOPES
MODEL
V-151 B
V-152B
V-202
V-301
V-302 B
V-352
V-550B
V-1050
DESCRIPTION
15MHZ, SINGLE TRACE
15MHZ, DUAL TRACE
20MHZ, DUAL TRACE
30MHZ, SINGLE TRACE
30MHZ, DUAL TRACE
35MHZ, DUAL TRACE
50MHZ, DUAL TRACE
100MHZ, QUAD TRACE
30 -DAY
PRICE
S
427.50
551.25
637.50
558.75
746.25
862.50
1,308.75
1,792,50
VOLTAGE
DEVICE
TYPE
LM317KC
LM3 7 UC
UA7805KC
UA7805UC
UA7806UC
UA7808KC
11
UA7808UC
UA7812KC
UA7812UC
UA7815KC
UA7815UC
UA7818KC
UA7818UC
UA7824KC
UA7824UC
UA78GKC
UA78GUIC
UA78HO5KC
UA78HI2KC
UA78HGKC
UA78P05KC
UA78S40PC*
UA7905KC
UA7905UC
UA7908KC
UA7908UC
UA7912KC
UA7912UC
UA7915KC
UA7915UC
UA79GKC
UA79GU1C
UA79HGKC
'MAX
ADJ.
ADJ.
1.5
.5
AM
P
1
5
5
6
8
8
12
12
15
15
18
18
24
24
ADJ.
ADJ.
5
5
5
5
12
ADJ.
10
5
ADJ.
1.5
-5
-5
-8
-8
1
1
1
1
-12
-12
-15
-15
1
1
-ADJ.
-ADJ.
-ADJ.
1
1
5
PRICE PER
STYLE
$1.84
TO-220
TO-3
TO-220
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
TO-3
TO-3
TO-3
16-DIP
TO-3
TO-220
TO-3
TO-220
$16.64
1.34
1
0.60
0.60
1.17
0.60
1.17
0.60
1.17
0.60
1.17
0.60
1.17
0.60
1.25
0.84
5.00
5.83
5.66
9.99
1.92
1.17
0.60
1.17
0.60
1.17
0.60
TO-220
TO-3
TO-220
TO-3
TO-220
TO-3
2. 10
10.59
5.45
5.45
10.59
5.45
10.59
5.45
10.59
5.45
10.59
5.45
10.59
5.45
11.35
7.57
45.38
52.94
51.43
90.75
17.40
10.59
5.45
10.59
5.45
10.59
5.45
10.59
5.45
11.35
7,57
51.43
1'.17
TO-3
100
10
1
TO-3
1
1
REGULATORS
PKG.
1.17
0.60
1.25
0.84
5.66
1000
$151.25 $1,375.00
110.00
96.25
49.50
49.50
96.25
49.50
96.25
49.50
96.25
49.50
96.25
49.50
96.25
49.50
103.13
68.75
412.50
481.25
467.50
825.00
158.13
96.25
49.50
96.25
49.50
96.25
49.50
96.25
49.50
103.13
68.75
467.50
,000.00
875.00
450.00
450.00
875.00
450.00
875.00
450.00
875.00
450.00
875.00
450.00
875.00
450.00
937.50
625.00
3,750.00
4,375.00
4,250.00
7,500.00
1,437.50
875.00
450.00
875.00
450.00
875.00
450.00
875.00
450.00
937.50
625.00
4,250.00
1
*SWITCHING REGULATOR
MICRO-PROCESSOR
SUPPORT
4
6
4
4
4
4
4
4
4
4
2708
2716
2732
450 NS
450 NS
450 NS
3.20
8.79
10.39
4.24
4.24
17.25
17.25
15.02
7.99
$
94.80
4.80
4.86
P.
100
10
1
29.04
79.86
94.38
38.48
38,48
156.82
156.82
136.49
72.60
S
---
1000
264.00
726.00
858.00
349.80
349.80
1,425.60
1,425.60
1,240.80
660.00
S
396.00
401.50
415.80
396.00
1,188.00
125.40
130.90
132.00
165.00
165.00
184.80
211.20
297.00
302.50
330.00
726.00
726.00
528.00
158.40
7.43
31.95
6.39
20.33
20.33
23.24
29.04
54.45
60.99
67.52
290.40
58.08
184.80
184.80
211.20
264.00
495.00
554.40
613.80
9.19
83.49
5.20
14.45
29.77
47.19
131.34
5.04
4.80
14.38
1.52
1.59
1.60
2.00
2.00
2.24
2.56
3.60
3.67
4.00
8.79
8.79
6.39
1.92
1.99
2.24
2.24
2.56
3.20
5.99
6.71
1.60
2.00
2.50
1.76
1.84
3.28
18.03
14.52
18.15
22.60
15.98
16.70
o
$
--
43.56
44.17
45.74
43.56
130.68
13.80
14.40
14.52
18.15
18.15
20.33
23.24
32.67
33.28
36.30
79.86
79.86
58.08
17.43
L,IJU lLOOI
A
DEVICES
PRICE PER
SPEED
MHZ
Z80B-CPU
MHZ
Z80A-DMA
MHZ
Z80A-P10
MHZ
Z80A-CTC
MHZ
Z80A-S10/1
MHZ
Z80A-510/2
MHZ
Z80A-S10/9
MHZ
Z80A-DART
MHZ
Z8001-CPU
MHZ
1.0 MHZ
6800
1.5
MHZ
68A00
68B00
2.0 MHZ
1.0 MHZ
6802
1.0 MHZ
6809
6810
450 NS
68A10
350 NS
68810
250 NS
6820
1.0 MHZ
6821
1.0 MHZ
68A21
1.5 MHZ
68B21
2.0 MHZ
6840
1.0 MHZ
1.5 MHZ
68A40
68B40
2.0 MHZ
1.0 MHZ
6844
6845
1.0 MHZ
6847
1.0 MHZ
6850
1.0 MHZ
68A50
1.5 MHZ
68850
2.0 MHZ
6852
1.0 MHZ
68A52
1.5 MHZ
68B52
2.0 MHZ
6854
1.0 MHZ
1.5 MHZ
68A54
68B54
2.0 MHZ
6856
1.0 MHZ
68488
1.0 MHZ
2114L
450 NS
2114L-2
200 NS
2114L-1
150 NS
6116-3
150 NS
4116-3
200 NS
4116-2
150 NS
MONEY -BACK GUARANTEE
&
CLOCK/
DEVICE
TYPE
Z80A-CPU
would like for you to take a closer look at your Membership
Binder and even try an order with E.B.C., so you may decide for
yourself how valuable a service this is.
Therefore, we guarantee to refund the full Membership Fee of any
new member who returns his Binder to us within 30 days from the
date of receiving it.
We
VREG
VOLT
163.9Q
--
528.00
132.00
165.00
205.95
759.00
145.20
151.80
270.60
429.00
1,194.00
E.71JLNJ
SUBSIDIARY OF ECI-USA, INC.
O, Box 617
(314) 474 -7400
Columbia, MO 65205
U.S.A.
2,400.00
-----
3,180.00
3,180.00
----------
----
--
3,600.00
3,650.00
3,780.00
3,600.00
----
1,140.00
1,190.00
1.200.00
1,500.00
1,500.00
1,680.00
1,920.00
2,700.00
2,750.00
3,000.00
----------
1,440.00
1,490.00
1,680.00
1,680.00
1,920.00
2,400.00
---------------
1,200.00
1,500.00
1,872,00
---
1,320.00
1,380.00
2,460.00
3,900.00
----
IJMq
EllIJo
4Ffr
SN7400N
SN7401N
SN7402N
SN7403N
SN7404N
SN7405N
515740615
SN7107N
5N7108N
SN7409N
5N7410N
SN70I1N
5N7412N
SN7413N
SN7414N
SN7416N
SN7417N
SN7420N
SN7421N
SN7422N
SN7423N
SN7425N
SN7426N
5N7427N
5N7428N
SN7430N
SN7432N
5N7437N
SN7438N
SN7439N
SN7440N
SN744IN
SN7442N
SN7443N
SN7444N
SN7445N
SN7416N
5N7411N
5N7418N
SN7450N
5N7451N
SN7/5359
SN7454N
SN7459A
5N7460N
SN7470N
74LS96
74LS01
.20
.20
.25
.25
.25
.29
.35
.35
.29
.29
.25
.29
.35
.10
.69
.29
.29
.25
.29
.45
.29
.29
.29
.25
.49
.25
.29
.25
.10
.25
.20
.89
.59
1.10
1.10
.89
.79
.69
.79
.20
.20
.20
20
25
20
29
29
74LS02
74L503
74L504
74L506
74LSO8
74LS09
74L510
74LSI1
74L512
7/L513
71L511
74L515
74LS20
74L521
74L522
74L526
7/L527
74L528
74L530
74L532
74L533
74L537
74LS38
74L5«
74L542
14L507
74LS«
71L549
7/L551
70L554
74LS55
71L573
7/L571
74L57S
71L576
.29
.35
.35
.49
.35
5.00
.50
.99
.69
.89
.35
1.75
.49
.59
.45
.45
.69
.69
.69
3.00
1.49
.88
.89
.35
.39
1.95
.39
.55
.59
.49
.49
.75
.75
.99
3.25
3.49
3.19
.79
1.95
1.29
1.25
.69
.69
5N7/74N
SN7475N
SN7476N
SN7479N
5N7400N
5N7482N
5N7403N
SN7485N
SN7186N
SN7489N
5N7090N
SN7491N
SN7492N
SN7493N
SN7494N
SN74%N
5157496N
5N7497N
SN74100N
SN74104N
5N74106N
SN74107N
SN74109N
SN74116N
SN74121N
SN74122N
SN74123N
SN74125N
5N7/126N
SN74I32N
SN74136N
SN74141N
SN74142N
5N7/143N
SN74144N
SN74145N
SN74147N
SN70148N
SN74150N
SN74151N
SN74152N
S797/15359
.79
SN74154N
SN74155N
1.25
.79
74LS
74L592
.75
70LS95
74L596
71LS107
74LS109
35
59
99
35
ss
35
35
35
35
35
59
45
39
35
89
89
115
115
35
35
35
45
45
59
74L5]8
45
49
74L583
89
74L5%
125
74LS86
49
69
74L590
7400
5N7172N
SN7473N
74L5112
74L5113
74L5114
74LS122
74LS123
74L5125
70L5126
74L5132
74LS133
74L5136
70L5138
71L5139
74L5151
74LS153
74L5154
74L5155
71L5156
741.5157
74L5158
74L5160
74L5161
71L5162
74L5163
74L5164
74L5165
74L5168
74L5169
74L5170
74L5173
74L5171
74L5175
74L5181
74LS190
70L5191
.99
1.15
.45
A5
.45
.49
.49
.89
1.25
-59
.59
.99
.89
.49
.89
.89
.89
.89
1.75
.89
.89
.89
-89
1.15
1.15
1.15
1.15
1.15
1.15
1.19
1.19
1-95
.99
.99
.99
2.95
1.26
1.25
rift
SN74156N
SN74157N
SN74160N
SN74161N
SN74162N
SN71163N
5N74161N
SN74165N
SN74166N
SN74167N
5N71170N
SN74172N
SN74173N
SN74174N
Bulova Quartz Ladies Watches
SN7119IN
SN74192N
SN74193N
SN74190N
5N71195N
SN74196N
SN74197N
SN74198N
SN74199N
SN74221N
SN74251N
SN74276N
SN74279N
SN74283N
SN74284N
SN74285N
SN74365N
SN74366N
SN74367N
SN74368N
5597439079
5597/39359
89
89
1
%
139
89
79
79
149
79
225
.
....
_
69
W
+
>r,.,
89
89
74551
74564
74565
74574
.45
.50
.50
.75
74515
74586
745112
745113
745114
.79
7451%
745240
745241
745242
CA3010H
CA3013H
CA3023H
CA3035H
CA3039H
CA3086N
CA3059N
C
C
0100
0400
C 0400
C
0400
CD4007
CD4009
CD/010
C04011
C04012
CD4013
CD4014
CD4015
C D4016
C04017
CD4018
C0/019
CD4020
CD4021
C
0402
CD1023
C D4024
CD4025
CD4025
C 04027
C04026
C04029
C04030
CD4034
CD4035
CD4040
112
.45
.45
.45
.55
.55
.50
.50
.45
.45
.45
.45
.45
74S
745124
745133
745134
745135
745136
745138
745139
3.95
.55
.69
1.19
1.75
1.35
1.35
/45140
.79
1.35
1.35
1.35
1.35
705151
745153
.45
745157
.55
745158
1.25
.50
745160
745174
.A
.79
.79
.99
2.15
3.25
2.49
1.35
1.30
3.25
.39
.39
.39
1.19
.25
.49
.49
.39
.25
.49
1.39
1.19
.59
1.19
.99
.19
1.19
1.39
1.19
.29
.79
.23
2.95
.69
.89
1.49
.49
3.49
.99
1.49
745188
745194
7451%
2.95
1.59
1.59
2.95
1.95
1.95
le
ewe.coem.
CA3%ON
CA3090H
CA3081N
CA3082N
CA3083N
CA30B6N
C D4041
1
CD4042
CD4043
CD1044
49
99
0098
C D4586
C 0450
CD4508
C04019
35
19
C 0405
CD4510
CO4511
CD4512
CD4514
C04515
C01516
CD4518
69
C0/519
89
89
79
C D4046
1
C0404]
250
C D4048
1
C04051
1
19
CD4520
C D4052
1
19
C
C D4053
4
0452
19
CD4528
C D4056
2
%
C D4529
C04%9
9%
49
CD4543
CD4562
79
C 0456
39
C04583
CD4584
C04723
CD4724
C 04060
C D4066
C 0406
1
C D1G69
45
C DI070
55
09
49
C04071
C 0/072
CD4073
39
CD405
C 04076
C D4078
C 0408
C D1082
C D4093
1
39
39
55
39
39
99
MC14409
MC14410
MC14411
MC14412
MC14419
MC14433
MC14538
MC14511
3%
1.39
1.29
1.49
3.95
2.95
1.49
1.79
.89
1.29
1.79
1.79
1.95
2.79
11.95
2.79
2.49
.75
1.95
1.95
II7.M
TItI
TII
12501JE
72601JE
15551PÁ
7556IPD
311.1E
614
761IBCPA
T11J6
TITI
r
7612BCPA
76218CPA
7631CCPE
7641CCPD
7642CCP0
7660CPA
8078CCPD
8048CCPE
8869CCQ
8211CPA
8212C0.4
2110
221 14
xx.rL..nr..no
CC
ee
.oiw99.,
op
Seea05
2/ 156
e
iopR99a.11
o46N99
tj
.
SIN
WAS
e
~
.
t
te
191,1C01 ere
2
LSO
T
I5%
WVOC
255
50
210
J
n
I.O
24000
27410
12,SÁ
55
1.40
40.950
10
100
33
1.15
1.150
395
15.000
1500
15
2.10
11000
3.000
i5
2.00
I50Á
2.n
2.n
10
0
4.509
5.500
LMIOCLH
LMIICLH
«
OVER
20.090
395
049
21 OM
20
11000
0
3«
2.n
10
8
16
It
20
22
24
28
36
40
pin LP
pin LP
pin LP
349
-24
.17
.20
.22
.29
.34
.37
.38
.45
.60
.63
Pin LP'
pin LP
pin LP
pin LP
pin LP
pin LP
pin LP
1
pin
pin
pin
18 pin
24 pin
28 pin
36 pin
4D pin
8
14
16
5G
5G
.39
.49
.54
.59
.79
1.10
1.65
1.75
SG
SG
SG
SG
SG
SG
73,00
00,00
S
7.95
IS
095
10
10
8.95
1.95
95
95
2
115
0,00
200
0
n
R.95
pin
16 pin
18 pin
24 pin
28 pin
36 pin
14
40
ST
ST
ST
ST
ST
-24
25-49
.27
.30
.35
.49
.99
1.33
1.59
ST
Pin ST
.25
.27
.32
.45
.90
1.26
1.45
10
5H.
1
21
68
1
18
pin
pin
pin
pin
pin
20
Pin
8
50100
14
.31
.41
.44
.48
.69
.90
1.26
1.45
16
pin
pin
pin
36 pin
40 pin
22
24
28
WW
WW
WW
WW
WW
WW
WW
WW
WW
WW
WW
5-49
-24
.59
.69
.54
.63
.73
.77
.90
5.08
1.35
1.26
1.53
1.99
2.09
.5
.85
.99
L19
1.49
1.39
1.69
2.19
2.29
Ohm 12 Ohm 15 Ohm
Ohm 33 Ohm 39 Ohm
Ohm 82 Ohm 100 Ohm
Ohm 220 Ohm 270 Ohm
Ohm 560 Ohm 680 Ohm
18
47
120
Ohm 22 Ohm
Ohm 56 Ohm
Ohm 150 Ohm
Ohm 390 Ohm
Ohm
1K
ASST.2
5ea.
ASST.3
5ea.
1.2K
1.5K
LOK
2.2K
2.7K
19K
4.7K
5.6K
6.8K
5m.
3.3K
6.2K
10K
12K
15K
18K
27K
68K
33K
82K
39K
5N.
22K
56K
100K
47K
(20K
524.
150K
390K
180K
470K
220K
560K
270K
680K
330K
820K
1M
1.2M
1.5M
1.8M
2.7M
3.3M
3.9M
4.7M
2.2M
5.6M
180
470
ASST.4
ASST.5
ASST.
S
ASST.7
bee.
ASST. 8R
-
330
820
Includes Resistor Assts. 1 -7 (350 pos.)
510.00 Minimum Order
-
U-S. Funds Only
California Residents Add 8% Sales Tax
Postage
Add 5% plus $1.50 Insurance
Send S.A.S.E. for Monthly Sale Flyer(
sop..
50100
.19
.58
.67
.A
.81
.99
1.23
1.14
1.38
1.79
1.89
LM304H
LM306H
LM307CN
LM308CN
LM309H
LM309K
LM310CN
LMlll/CN
LM312H
LM317MP
LM317T
LM317K
LM318CN
LM319N
LM320K6
LM320K-12
LM320K-1S
LM320Ti
LM320T-12
LM320T-15
LM323K
LM324N
LM3290Z
LM331N
LM334Z
LM3352
LM336Z
LM337T
LM337MP
LM338K
LM339N
LM310K3
LM340K-12
LM340K-15
1.%
.%
.45
1.00
1.96
1.25
L75
.90
2.49
1.15
1.75
3.96
1.95
1.95
1.35
1.35
1.35
1.25
1.25
1.25
5.95
.99
.65
3.95
1.30
1.10
NES«N
NE550A
NE555V
LM556N
NE564N
LM565N
LM566CN
LM567V
NE570N
L75
1.%
1.15
6.85
.99
1.35
1.35
1.35
1.25
1.25
1.25
-75
.75
.75
.69
.69
.69
1.25
5.75
.60
1.00
1.10
1.10
1.00
1.79
4.«
325
2.95
1.25
1.%
1.95
2.25
74C2«
2.5
740373
2.49
2'
74C374
74C901
74C903
.69
10.95
740911
710912
74C915
740917
740922
l0.%
1.69
10.95
5.49
5.75
7.50
7.50
.79
74C923
74C925
74C926
80C%
80C97
.79
LM702H
LM703CN
LM709N
LM710N
LM711N
LM723N
LM733N
LM739N
LM741CN
.79
.89
.29
.79
.79
.69
1.00
1.19
.35
MCI74ISCG
LM747N
LM748N
LMI014N
LM1310N
LM1158CN
LMI468N
LM1489N
LM1496N
LM1556V
LMI896N
LM1871N
LM1872N
LM1877N9
LM1889N
.79
.59
2.75
1.95
.59
1.25
1.25
1.95
1.75
2.95
5.49
5.19
3.5
3.20
1.75
LMIB%N
1.79
1.95
1.29
1.45
1.35
.69
LM2002T
LM2877P
LM2878P
1.09
2.05
LM28%P-I
LM3189N
LM3900N
LM3905CN
LM3909N
LM3914N
LM3915N
LM3916N
RC4135N
RC4151NB
RC4194TK
RC0195TK
4.00
5.60
4.49
1.75
6.00
4.%
3.96
6.00
6.00
4.95
1.30
.39
.99
3-95
1.25
1.95
1.25
LM450lA
4.%
75492
ICL80388
LM13080N
3.00
2.25
2.25
2.95
.69
1.25
1.15
3.95
3.95
3.95
1.25
3.96
6.85
5.49
3.25
1.95
LM13696r4
1.29
1.49
5138N
1.%
75450N
75151CN
.89
.33
.89
CAPACITOR CORNER
50 VOLT CERAMIC DISC CAPACITORS
Value
19 10-99
19 1049 100+
22
17
100
.08
.08
.08
.08
Pf
pf
pf
pf
50pcs.
$1.95
220 p7
470 pf
50pcs.
$1.95
.001mí
.0022ml
.0017mí
.OB
.08
.06
.06
.06
.06
-06
.06
.OS
.0110F
.05
.004714F
.%
.05
-O5
.05
.01µF
0255sF
0476yF
.I6F
.08
.08
.00
.09
.09
.15
.06
.06
.06
.07
.07
.12
100 VOLT MYLAR FILM CAPACITORS
.12
.12
.12
.12
.10
.10
.10
.10
.07
.07
.07
.07
.022mí
.047m/
.1mí
.22mí
$1.95
.01ml
$1.95
.15/35V
.39
.34
.29
2.2/35V
1.0/356
.39
.39
.39
.34
.34
.31
.31
.29
.29
.29
.29
C
$1.95
$10.95 ea.
/35V
.399
.47/35V
.68/35V
nape.
2.95
2-95
74C221
74C240
Value
$1.95
.13
.21
.27
.33
.11
.17
.23
.27
100+
.05
.05
.05
.06
.06
.10
.06
.13
.17
.22
+20% DIPPED TANTALUMS (Solid) CAPACITORS
./1
.37
.25
.29
1.5/óV
V
.39
.34
.1
50pcs.
50pcs.
-
Spec Sneets
250
Send 88e Postage for your
FREE 1982 JAMECO CATALOG
Prices Subject to Change
e
-
LM310T-12
LM310T-15
LM341P3
LM34IP-12
LM341P-15
LM342P-5
LM312P-12
LM312P-15
LM348N
LM350K
LF351N
LF353N
LF356N
LF356N
LM358N
LM359N
LM370N
LM373N
LM377N
LM380N
LM381N
LM382N
LM384N
LM386N-3
LM387N
LM389N
LM392N
LF398N
LM399H
TLe34CN
TL496CP
NES10A
NE529A
NES31H
NE536H
NESIOH
2.19
LH0094C11 36.80
LM300H
.99
LM301CN
.35
LM302H
1.95
-5%
$1.95
LM310T3
TLONCN
50pcs.
ELECTRONICS
4)82
.24
.25
.30
.42
.81
1.15
1.30
LINEAR
LH0070-OH
TL071CP
.79
TL072CP
1.39
TL071CN
2.49
LH0062CD 35.60
TL082CP
1.19
l0
Iamèòo
18-95
15.95
15-95
50.100
WIRE WRAP SOCKETS
(GOLD) LEVEL #3
1/4 WATT RESISTOR ASSORTMENTS
ASST.
1.95
OR WRITE FOR YOUR REQUIREMENT
1
.35
.45
.49
.53
.75
1.00
1.40
1.59
5.0
10.00
1
I
20
- CALL
5.95
0
SOLDERTAIL
STANDARD (TIN)
.15
.18
.20
.27
.30
.35
.35
.43
.58
.61
25-49
1.24
1.vs
l0
3
7
10
10
111
20
10
51009
195
55
STANDARD
I
n
95.000
SOLDERTAIL (GOLD)
11
2.n
1.15
0.00
3 95
50.100
.16
.19
.21
.28
.32
.36
.37
.44
.59
.62
2.15
10
25
295
LOW PROFILE
(TIN) SOCKETS
14
PRICE
28
2
35
0.00
0,
5.0
18
21.00
23.00
I.
n.000
OTHER VALUES AVAILABLE
25
40
510
0
LL00
I.n
Sn
71C193
74C195
.99
SIL«
e0OC
OTO
2.n
9
II
01,00
1.15
PRICE
15
,00
1
)1,00
3.00
1,500
9/VDC
1100
10.00
2.40
n
0
1.50
err/
PRICE
145
150
6-96
6.85
4.50
4.75
4-95
COMPUTER GRADE CAPACITORS
MVP
74C157
74C160
74C161
74C162
74C163
74C161
74C173
74089
1.29
1.29
1.59
1.89
2.95
3.95
2.25
1.69
1.60
1-49
1.69
1.59
1.39
1.39
1.19
1.69
1.69
1.59
74CI51
71CI54
74CI71
710175
74C192
LH0002CN
914.61
74C
74C95
74C107
L%
74C90
74C93
vvvey
N.44
21.60
2.50
1.39
1.95
.79
.79
TIW
2/ 105
Sel,ex.aro... u
C
sae
Monolithic Logarithmic Amp
50ppm Band -GAP Volt Ref- Diode
Volt Ref /Indicator
Volt Ref/Indicator
39
74C73
74C74
71C85
71C86
an
T
w
14.95
20.95
Stopwatch Chip, XTL
341 Digit A/D (LCD Drive)
16.95
IC, Circuit Board, Display
34.95
344 Digit A/D (LED Drive)
15.95
IC, Circuit Board, Display
29.95
344 Digit A/D LCO 01s. HLD.
18.95
17.95
361 Digit A/D LED Dis. HLD.
Low Battery Volt Indicator
2.25
12.95
CMOS LED Stopwatch/Timer
Stopwatch Chip, XTL
19.95
5.15
Tone Generator
Tone Generator Chip, XTL
1295
Oscillator Controller
6.50
13.95
Freq. Counter Chip, XTL
Seven Decade Counter
17.95
Clock Generator
3.95
4 Func. CMOS Stopwatch CKT
13.95
4 Func- Stopwatch Chip, XTL
19.95
32.00
8 -Digit Univ. Counter C.A.
8-Digit Freq. Counter C.A.
26.95
8-Digit Freq. Counter C.C.
21.95
4 -Digit LED Up /Down Counter
12.95
10.95
8-01914 Univ. LED Drive
11.25
LCD 424 Digit Up Counter DR1
31.95
8-Digit Univ. Counter
74.95
5 Function Counter Chip, XTL
4.95
CMOS Bin Frog. Timer /Counter
y-256 RC Timer
2.05
CMOS DlviD
6.00
CMOS BCD Prog. Timer /Counter
CMOS BCD Prog- Timer /Counter 5.25
1.45
CMOS 555 Timer (8 pin)
2.20
CMOS 556 Timer (14 pin)
CMOS Op Amp Comparator SMV 2.25
SMV 2.95
CMOS Op Amp Eat- CmvrCMOS Dual Op Amp Comp. SMV 3.96
10MV 5.35
CMOS Tr! Op Amp Comp.
CMOS Chad Op Amp Comp. IOMV 7.50
CMOS Quad Op Amp Comp. 10246 7.50
Voltage Converter
2.95
1.95
Waveform Generator
.39
.39
.39
.75
.39
74048
1.11
Price
CMOS Precision Timer
.39
.39
74CO2
011.78
4..fte
+
74060
74C01
74C08
74C10
74C14
74C20
74C30
74C42
1/141
21 15.
eye
tec4.4
0
2/ .711
t1.18
15
NSIG.
Tl
13
pewlAYe
41p10r11
1795
7.95
15.95
2.49
1.95
7242IJA
2,......
xoyxo.,
ee
2.95
2.49
.75
.99
CID-CMOS
/Kit
72401.1E
1
.0g.vreesMseewisI
l.%
CD
.85
CC
ease
NSW.,
1404244
7226AUL
7226AEV
119911......
Lopu.p..a
ea
-
2.49
1.95
3.75
3.95
1.39
1.25
1.25
.59
3.50
IJI
72280IJI
7224IPL
ARRAYS
D NUMERIC
es cc
2.«
CA30B9N
CA3096N
CA3130H
CA3140H
CA3160H
CA3401N
CA3600N
/Kit
7216AIJI
SITJS
xop o..n
1,60
9-%
3.15
3.15
3.25
1.25
2.00
2.00
1.60
...
.
.69
2.49
745573
745940
745941
u
.4
.
i.
Le 99.99.
t op LL911118n11
MuL
I.%
2.95
2.95
3.25
72091PÁ
7215IPG
7216EV
TITI
11R011.
wrouss.+
.89
.89
.99
.99
1.25
1.29
1.29
.69
.69
.69
.69
1.95
5.%
9.95
u
v
wy,11usr
cc
Be
Be
.69
1.95
-%
CA-LINEAR
Ile use
e
elm...0
e
10.95
12.95
12.95
5.95
a
,
pp
ea
-
69
149
149
v u
.,.w.LED NUMERIC
eami
69
10-95
+
w.-a
69
10-95
T-
...
...
2 FOR
BALE
NATIONAL Stick Display Sale
esAng
69
705472
....
-
rum.
395
395
745570
745571
745572
1
...u.r,.11..,
.r....am..n
..
aelleernIm
149
349
72%1P1
72171JI
N
w. ix.,
79
705374
745387
745471
74515
-......
/Kit
/Kit
/Kit
7206CEV
7207AIPD
7207AEV
7216DIP1
-.
44444114441
99
95
3.25
3.25
1.45
1.45
1.35
1.35
.79
2.95
3.25
2.75
3.49
$69.95 ea. any Model
119.11.11.4110149941.5CTOR ARRAY.
149
149
125
745243
745244
745251
745253
745257
745258
745260
705280
705287
715288
745373
745473
745474
....
°""
1
74500
74502
74503
74504
74505
74508
74509
74510
74511
74615
74520
74522
74530
74532
74538
74540
s09aw inso.w
W71v
LITRONIX Stick Display Sale
89
7/L5247
81L597
'r
89
1.19
1.19
1.49
1.49
1.49
1.49
1.49
2.95
1.19
1.19
1.19
.99
.99
.89
.69
.69
Rnss.00
7216C
89
15
eaesvr
CALL OR SEND ORDER IN REFERENCING TO THIS AD FOR SPECIAL PRICE
Because of Limited Supply, please provide a second and third choice
249
249
125
125
Ì
81L5%
Your Choice
79
1
nwm
w
eo9M
99
71L51%
74L5393
74LS399
74L5670
s9óRn.lt,wm
ssv
7206C
-
4
15
74L53%
7205EV
95
1
74L535
72011DR
72051PG
2 79
115
74L5248
74 LS249
74L5251
74L5253
74LS257
74L5258
74L5260
74L5266
74L5273
74L5279
74L5283
74L5290
74L5293
74L5298
70L5352
74L5353
74L5365
74L5366
70LS367
74L5368
71LS373
74L5374
7I16CPL
7117000
89
125
74L5192
71L5193
74L5194
74L5197
74LS221
70L5210
74L5241
70LS242
74L5243
71L5244
74L5245
/Kit
7106
7106EV/
EV /Kit
7107CPL
7107EV /Kit
705EV
89
SN7415N
SN74176N
SN74177N
SN74179N
SN74180N
SN74181N
SN74182N
SN74184N
SN74185N
SN74190N
704510.1
69
89
89
11
g
Function
Part No.
ONE YEAR FACTORY WARRANTY
79
1355 SHOREWAY ROAD, BELMONT, CA 94002
(415) 592-8097
PHONE ORDERS WELCOME
7V
6.8/25V
15/5V
22/6V
.51
.663
.5
1.39
.5
.46
.34
.56
.69
1.25
.69
.45
.55
.95
.55
MINI. ALUMINUM ELECTROLYTIC CAPACITORS
Axial
.47/50V
5.0/506
3.3/506
4.7/25V
10/56
22V
22/50V
199 196-499 500+
Radial
.16
.19
.17
.18
.18
.14
.16
.15
.15
.15
.10
.12
.11
.11
.11
.47/25V
.47/50V
1.0/16V
1.0/25V
.19
.16
.12
.24
.20
.18
21
.19
.23
1.7//25V
4.7//5500V
IO /166
47/256
.5
47/SOV
196/25 V
100250V
220/25V
.29
.28
Al
.25
.24
.37
.39
.34
.33
220/50V
470/25V
470/25V
2200/16V
.49
..59
.54
.89
.45
.49
.69
.79
.41
.61
.61
.69
.22
.34
L0/50V
10/25V
10/50V
47190V
100 /86V
100/75V
220/16V
100750V
470/2551
-99 100-499 500+
.12
.15
.I3
.13
.16
.14
.12
.15
.13
.13
.16
.14
.17
.15
.14
1
.16
.17
.15
.16
.17
.5
.21
.25
.25
.25
.35
.14
.15
.13
.14
.15
.21
.17
.23
.21
.21
.31
.13
.14
.12
.13
.14
.19
.14
.21
.19
31
.27
POPULAR ELECTRONICS
-MICROPROCESSOR COMPONENTS
UTIC
MINI STEREO
FM RECEIVER
0.214
WITH HEADPHONES
SPEAKERS
-81.25Ohm.99
21/4" Round
.25
25"
x
5"
ACI.LCN
1%
DACIO2OLCN
Bus O rlvr r
DMZ.
22
N
System Controller
0171231
INEspI/O
0
v6251
13.51
00820
OPE)
D.a9
6%
5.%
0.
17.279
Moo.
-
System
v.n
aBit
I -Bit
0.
Octal
Octal
6
BI. Dlrectlonal Receiver
Bi- Directional R
Latch.
Latch.
3
«me
Static RAM
Peripheral Inter. Adapt IMC619)
MPU wan
MC60I
aha RAM
C
.a5
H.%
Mienty interrupt Controller
17.%
194 0.e11 ROM
H.%
Large Ceramic Magnet
MC6M0
(MCMAAa)
Asynchronous Comm. Adapter
synchronous Sena) Data Adapter
MOM. D191í1 MODEM
tor
Zmobps
Ousel-State
tate Bus. Trans íh1.720
Size: 2%" x 2%" x
5"
MC6.2
MC6562
MC..
0 National Semiconductor
$2.49 each
EACH $16.9511o0 (100 EACH $195.8511oí)
$2.95 each
MM2114N2L 4Kt2200NS) Low Power
(8 EACH $19.9511oí)
(1
EACH $225.00IIO0
$4.95 each
MM2147N 4K (70NS))
(8
EACH
$34.95110111
.............. $14.95 each
(8 EACH $99.951100 (100 EACH $1195.00/1ot)
$14.95 each
EACH $90.95/101) (100 EACH 91195.00/1ot)
$2.95 each
MM5290N -2 16K (15ONS) 4116
EACH $19.95/lot)
(100 EACH $225.0011.0
51.95 each
MM5290N -4 16K (250NS) 4116
(8
EACH
5149oä
5/11
.K
MPU- 1-Bt (6MNC)
CPU -Sal. ChIP Selt(121.0sRAM)
NSW31N4
(100 each S175 .001101)
INS(0ÁN
.510ÁN
0035
76 59100431
30
11173A11-1
N.%
N.%
5.%
9.%
A.%
TsM Muskat IAN CMp
5 86
I
SHIFT REGISTERS
belt
Dual
M9091-1
Dynam/,
Dyn.ml<
.Bit
Dual
MM1M2N
9.45013N
040460tH
29 -130 Dynamic
168811 Dynamic /Accumulator
500/5/9511 Dynamic
Octal VAR
Mk..N
2.%
1%
1.%
a.%
%
1.%
3.%
2.%
MMMSry
Octal...11
25018(149.) 194 -1111 DYnamlc
PAIN
Hex 32-6111 static
Oml
ANY
1.01111
static
Dynes.
512-Bit
2.95
too
25ÁV
EON
Clued
Welt static
z%
10)
6.%
m 56-1111
.1PC
Flfo (Dual
4.00
DATA ACQUISITION
ÁF(07(024
Ernes 2708, 2716, 1702A, 52030, 5204Q, etc.
Ernes up to 4 chips within 20 minutes.
Maintains constant exposure distance of one inch.
Special conductive foam liner eliminatesstatic build -up.
Built -in safety lock to prevent UV exposure.
Compact only 7-5/8" x 2 -7/8" x 2"
Complete with holding tray for 4 chip.
$16.95
UVS -11 EL Replacement Bulb
-
2..
U
Tu
one Low Band Filter
Touch Tone High Band Fluor
ÁF111 -1C-I
AE.ICJ
super Gate Op Amp
LNIABCH
LMSSI2
LM3 %Z
Constat Current Soufis
re Tra
m
Un
SFETinput
w
Op Amp
sema, L Hold Ampell
Temp. COMP. arec. Rr. (.5oonV.n
nMr
L F39N
L oma
LINK.
ADC0101LCN 1-Pí A/O Convener (I Ese)
$79.95
JOYSTICKS
M.
12
6
C54321
2400.Á8C13
2400-5C
JS-SK
JVC -40
5K Linear Taper Pots
100K Linear Taper Pots
40K (2) Video Controller in case
$5.25
$4.95
$4.95
..
MUFFIN® FAN
CSngarstl.a
2
3
4
4
24004
JS -100K
1200/601-1z
DC900
0C1200
12020V/60H
16K
141
221,
(4v, 9V, DV )
COPm
M -290
A/9100
1.M
1.10
sm
126
004-5X5
00101
K.Merti Encoder
Keyes..
)1301665
.
ABCD
8 pin
8 pin
.79
.89
8 on
8 pin
99
99
t 09
14 on
-
0
-
-
Kit comes complete with:
0y.
Keyboard Encoder (9 key.
Push Button Pulse Dialer
96/1.K. Aortal iuybmrd Encoder
M.
Cenllguraen
8
2400.7
2400 -8
7
10/ 8.95
10/ 9.95
2400 -9
8
9
240010
10
123458
1234567
12345678
123456789
0123456789
TRS18K4 250ns
S
.
KEYBOARDS
5.5
7.
555
Datanectics 74 -Key Keyboard
least
14 pin
14 pin
Part No. KB354
16 pin
18 pin
1.19
1.29
1.39
20 pin
1.49
10/ 695
10/10.95
),1,
10/11.95
10/12.95
10/13.95
Micro Switch 69 -Key Keyboard
x 50 "W
Frame. Light 8 dark grey key caps (NO Dala Sheet)
booms
10 en
Description: The JE215 is a Dual Power
Supply with independent adjustable positive and negative output voltages. A separate adjustment for each
of the supplies provides the user unlimited applications
for IC current voltage requirements. The supply can
also be used as a general all- purpose variable power
supply.
FEATURES:
Adjustable regulated power supplies,
and
,I
9.
-
n
MISCELLANEOUS
SOO
014131
GOIM
0012/
An*
01.
nm 14oeh,4 4v4
DIODES
1004.
GRIM
72 00
GOMO
1017701
I
INOIM.1401
PO
2
-
00
GPI In
U.S. Funds Only
$10.00 Minimum Ordel
California Residents Add 6% Sales Tax
Postage
Add 5% plus $1.50 Insurance
Send S.A.S.E. for Monthly Sale Flyer!
-
-
Spec Sheets
25e
Send 884 Postage for your
FREE 1962 JAMECO CATALOG
Prices Subject to Change
ameco
Mag Order Electronics
Worldwide
ELECTRONICS
.
4182
MANY OTHERS AVAILABLE
WRITE FOR INFORMAT97N
-
JE600
FULL 8 -BIT
LATCHED OUTPUT
19-KEY KEYBOARD
40131
Boone
NM. 11.0.
200 wefts.
Hexadecimal
Encoder Kit
POTENTIOMETERS
,,.ir
'Total avenge output shall not eased
General D.acdpllon: The "Boschert" Power Supply was originally
designed (or application with ITT Advance Terminal Centro or ATC).
This open trame switching o
supply provides user euh high un
rent
puterayalena. Its compact
ant.requirements common
with
size pr vides versatility for mounting Into electronic enclosures. Each
suppp,y has 6 threaded fasteners (pnm nut type) for mounting.
Specification requirements to be used with ATC enclosed.
Part No. 200.3010............ $69.95 each
POW
474
FEATURES: Voltages.: 5VDC [rag 25amps, 12VDC a amps. 524VDC a
lamps. Reg. Load: +59 out 01 %,
12 6 24V out :5% (20-1009e
load). Overall. a mmercun. protection. 115 or 230VAC Input. Wt. 4 lbs.
SW: 4.95" x 2.50" x 15.00"
i se
an
MM. MIOPInol
P.M
W
..
JE215 Adj. Dual Power Supply Kit (as shown)
$24.95
(Picture not shown but similar in construction to above)
JE200 Reg. Power Supply Kit 15VDC, 1 amp/
$14.95
.1E205 Adapter Brd. Ito JE200) 05,09 & 12V. $12.95
JE210 Var. Pwr. Sply. Kit, 5- 15VDC, tol.5amp. S19.95
sul
eaa,READOUTS
DC.
Power Output (ach supply))
5VDC @ 500mA, 10V DC @ 750mA,
12V DC@ 500mA, and
15VDC@ 175rnA.
Two, 3- termine) adj. IC regulators
with thermal overload protection.
Heat sink regulator cooling
LED "on" indicator
Printed Board Construction
120VAC Input
Size: 3.1/2 "w x 5- 1 /16 "L x 2 "1-1
71317
I518"4 Metal
5VDC. 12VDC and 24VDC
P.Ins.
Wm
411117
40110
z
$19.95 ea.
Boschert Multi -Voltage Power Supply
RESISTORS
41.
x
5:.
Uses AMI SW20350K Chip. Size: 103/8"31
GB1B0 (Pictured Above)
426
-
$29.95 ea.
hke
1.09
/
Uses EA 20134 Chip (Electronic Arrays) Size: 16' 4"L x 5` "W
1.318 "14. White, black. blue, grey key capa (No Data Sheet)
Part No. KB69SD12-2
LAMPS-
60
19.95
18.95
14.95
TRS.16K3 20ons
s
M.P. PP. 0.1.. IIT0.3
P.M Amnon
71M.to
Ram(ns)
"Mini- Dip-M" 2400 Serles
24004
..
MM5290 (UPD41614116) 16K Dyn.
1155
,
$9.95 ea.
$1.60
$1.79
$1.29
BNC Plug
BNC Bulkhead Recp.
Documentation for conversion
TRS -18K2 15Ons
4.96
00000
Om
$1.60
Expand your 4K TRS80 System to 16K
8 ea.
1455
14. %
HARDWARE
-
.49
$1.29
TRS80
-
(M keyel
5
16K Conversion Kit
SWITCH AVAILABLE!
N111 all maw brands of Dip switches
UniquetMlures include looking
P
Pen Ne.
sr
General
APRIL 1982
PL258
PL259
UG260 /U
UG 1094/U
19.95
er Oa
9.5749.1
UHF Adapter
UHF Panel Recp
UHF Adapter
UHF Plug
50239
s10o
INTEGRATED CIRCUITS
JE215 Adjustable
Dual Power Supply
POE
13.10
SWITCHES
Watts, 0OSelm
6 tested.
.
13.50
$2.95
$3.50
2/5.99
$1.75
52.95
$1.79
$3.79
Screw Lock Hdwr,12) DB25S /P
Cover for 13825P/S
P.C. Edge 122/44 Pin)
BNC Plug
BNC Jack
2t%
Encoder (1 keys)
4099
74093
MM531904
10/ 8.95
10/ 7.95
10/ 8.95
Prke
Socket
123
1234
ea. FIMPOP.
00
Ulka.nloelly oleanoZ
.
9
11.9
3.50
Repertory Dialer
MOS Clock Gentor
Ví990
0- Subminiature Plug
D- Subminiature Socket
DB51226
22/44SE
UG88/U
UG89/U
UG175 /U
9
5.00
TELEPHONE /KEYBOARD CHIPS
Push Button T4ephon DN.
x 1.50" depth. Weight
17 ou
acoustical rating as IOW as NG38
than 10 yrs. cont. duty at 10C
Impedance protected
for ambiento to 70C
UL yellow card recognized L
.
DB25P
DB25S
1320418-2
16.%
7
4.68" sq.
MU2A1
-
Dn.
AY -3235
53.95
1.95
on Cnio
COWMAN
mÁ
14.%
Microprocessor Owl Time Clock
I.%
sor Compatible Clock
11.93
teller with 0019Ií RAM 6.16
ea Direct ED DI NO
roller with 4-Digit RAM
Direct LED Drive w/N Bess Int.
32.9e9.8Á0 Fluor.
00-Pin i.9.1 3.5
COME!
3000
H.%
¢ Controller
ID1M1
NS269N
0404041724
0404912424
12VDC
e.%
Dual OS Clock Driver BMZI
Dual MOS Clock (Alvin 151421
135005C5
12OVI60H2
17.95
7.49
SPECIAL FUNCTION
050523024
1V 60Hz
CONNECTORS
9.%
6.%
Manual
uu, Manual
UNr Manual
CAPACITORS
105c1m free air delivery
Allje
D9200
ROM'S
Characlr OenerMOr 1090.1 Caael
9513(3121)
chmact, Osmrator (Lower Cate)
READ ONLY MEMORIES
MCM9110P
/5x9.1 ASCII Shifted w /Orao
MCMMIMP
Iax90 Mate Symbol /Pictures
040049/50/7
15. 7.pea. Control Gesell..
MICROPROCESSOR MANUALS
GRAB BAG
SPECIALS
aacend.515. low post, 1..99110e1110g
an for Oommerclal Ooaling appuca0one.
CSA approved
1159, 50180HZ, 14
l.e
EPROM
11161 ní1151601
EPROM (Single 501
EPROM
21910151 TI
279
114 EPROM (401 ./ (Shale mot
27640
4K EPROM IHltarel H144627./
591
2015 PROM
95231745.1
]2x9 PROM IOmn Coli.ctor1
496 Bipolar PROM
09115
320 Tri -State Bipolar PROM
925123pä5291
US
SK PROM
Over A More PROMS Listed In Our Catalog
19.%
19.95
1.15
1.00
1.%
14.%
MINI -DIP is designed to rat
rod design lo prevent accidental actuation and gold sell wiping contant One-piece housing and
press -III terminais prevent contamination 2-10 station Form "A" and 15 station Form "C."
T4mind5 on .100 s .305 12.54 x 7.82) eaten
PCB or dip salmi meuwabIl
.e811
c%4rle9 /Wpleg NEE with $Ord canted Tool sad end Wen 5.4
2400-2
2400-3
V C-40
MASAN
CONAN
THE MOST UNIQUE D
2400 -10
J
DC6912 (above)
static
PROMS /EPROMS
2K UV Ermine PROM
of 1.4M90I1
Bit RAM 116x4001
Dynamic 1oen
1K EPROM
EECO Rocker DIP Switch
Pan No.
IK Static
(11704160 -3)
0x4
1701Á
5.»
4.%
°AGSM -Mr salt DIA Convener (c11 Lin.)
UVS -11E
Input
150ns
Transformers
With Universal Plug and
BY Battery Snap
Selective voltages: 69,12VDC.
Polarity selection ( +I-,. 510 -foot
line from adapter to plugs
six.
Inch line from adapter se battery
snap. 120V/60Hz. 3000,A.
Output
Price
12VAC 250mÁ
$3.95
12VAC 500mA
$4.95
12890 1 amp
$5.95
VAC 1.7 amp
$3.95
68130 400mÁ (ball. charged 52.49
6,9,12800 3000A
59.95
9VDC 200mA
$3.25
90DC 500 A
$3.95
-
14
117V/60Hz
117V/60Hz
117V/60Hz
117V/60Hz
120208 /60HZ
4K
TMSIOömNL
TME401
2.95
static
Dual 250-Bit static
Dual ZMelt Static
550
ir:l
AC 250
AC 500
AC1000
AC1700
000501c
115.86/lot
04.96
810.00
set
N
Part No.
4
UPD4140..7
9
=Sell Dyne.<
EEV
ItrÌs
Ms
.Dyn.apns(lower N
44.96
$8.95
and DM8000 Series
goducn 1132E ragas)
57.50
äM610 Intel
PeinhenDesiy ndbook l.
Full date sheets, eppl. not. for Intel peripheral device
components 1644 pages/
2K.1 Dynamic
416x1 Dynamic
(4116116K
1224 pages)
30000
Intel-81(13m Book (1074 pages)
010100 Intel Component Data Catalog
Fun Pete sheets Io Intel's products end. memory devkes,
100x1 Oynamlc Fully Decoded
-NMOS
Dual ß51t Static
Dual 6401 Accumulator
1624 papas/ 7400,LS,L,H,S,
30008 Buy .boue(3)300131.3.15.
o'
0011.
c
98.86
National Series 80 Board Level Computer
NetionelTTL Logic Date Book
AC and DC Wall
513(214111
MM59H
59v
EPROM Erasing Lamp
95
9.9
CPU (11 Bytes RAM)
CPU --4 ROM RAM
CPU %/Banc Micro Interpreter
CPU
mow 148(1
MM..
DYNAMIC RAMS
MM4164N20 64K (200NS)
18
16.96
19.96
11.95
(100 EACH 9419.951105
MM8118P4 16K (2200NS)
18
MIN.J
1590054
STATIC RAMS
MM2114N -2 4K (200NS)
(8
1
EON Static
591
52515
1E
11.%
13.%
19.%
INSE104
401x1 Fast
5101
0
11.%
DM2901ADC CPU -4 -Bit Slice (Corn. Temp. Greoe)
MPU w /Clock
MCS6902
Bytes Memory)
RAM BALE
64K
040420014
16.95
95
6K I2KA1 Static 200ns
CPU (MOSSO) (21.70
CPU (MK3510N4114M.)
CPU
Zoo Iran
CDP.2
416..3
04045294 -3A
6.%
6.%
MICROPROCESSOR CHIPS
210 (70C1
201ns
100x4.tote
04045252
.1110/007
7.49
MC430l2
MC000
21152
.
4.%
MC609
-
30005
1021x4 Static 200ns Low Power
21590
56.1 Static
411624411.04161 NO Dynamic 25.s (12051054)
7.%
NIPU
5141
Static MOS
1@10 Static 45Ons
10240 Static 450ns Low Power
16.86
National Unfree-Dam Book
-
30004
3.%
290
211,3
6800/6800 SUPPORT DEVICES
MCMIOAPI
static
2950 Static
2114
Peripheral Driver
Peripheral Driver
MC6600
040602017
10041
2Á2
2111
Intel
(1376 pages, LM, LF. ADC. DAC, LH Series
.5
100x1 Static
2111 ( .1111
Keyboard/0.1m Interface
Element
30003
ÿ
.taus
2%x1
/.1011
áIO2
one- cost
hBtB1 01 eFO n
Pm
0.210
1.011
lO1
-
(706 pages) DP. 058000, DS3000, D575000. etc.
RAM'S
1696
Control
0.25
22LCN
595
ana.. for 45 series
Espana
Asynceronous Comm. Element
Pro, Comm. NO IUSARTI
prop. intervet
mop Peripheral I/0 1.0
DMA control
30002
1
DACIO9LCN
SyMm Controller/Om Orner
SF -25016 1.39 1.25
21/2" Square
16 Ohm
.25 Watt (4 mount. holes)
Pana
Watt (4" Leads)
Size:
=9
1
2%0 Static
102.1 Dynamic
149
1PO4
1
1200
61.131rectlonal Bus Driver
clock Gm for /Orner
17.tä
D
AY1
Dsu oD
N
CO
SBit A/OConverter I16Gh. Multi.)
D/A Conv. ....Comp. (199)1196
t D/A Conv. Micro. Comp. (0.94) I.%
IO elt D/A Converter (0A99 Lln.)
1.49
IO.B11 O/A Convertor (000 Ltn.)
12-BIt0/A Convert.. (O.Zms Lin.)
I.19
s.Chanml Mulllplsxer
AK 13AuD 1.110
6.%
DCOSDCCN
OAC9OOLCN
5.95
13.1224
and Skaters!
FEATURES: Lightweight headphones. Left /right
balance control. Full fidelity stereo sound. Additional black soft carrying case & shoulder strap. Belt
clip (hands free). Operates on 3 AA cell batteries (not
Incl.). Compact size: 31Ç' x 4%" x 1 ". Wt. 6 oz.
Model 1810 List Price $89.95
$29.95
l.5
Input/Output
Priority Interrupt Control
13.216
For Joggers, Cyclists,
Peda A0201
set
00212
National Semiconductor - Intent!
National CMOS Data Book
IBM pages/ 74E. 054000, end A/D Converters
5.000) Interface Date Book
30001
4.95
c Pu
A
BOOKS
DATA ACQUISITION (CONTINUED)
8080A /8080A SUPPORT DEVICES
-
1355 SHOREWAY ROAD, BELMONT, CA 94002
PHONE ORDERS WELCOME
(415) 592 -8097
The JE600 Encoder Keyboard Kit provides two separate
hexadecimal digit. produced from sequential key entrees
to allow direct programming for 8 -bit m croprocessor
or 8-bit memory circuits. Three additional keys are proolded for user operations with one having a bistable
output available. The outputs are latched and monitored
with 9 LED readouts. Also Included Isa key entry strobe.
Features: Full 8-bit latched Output for microprocessor
use. Three user- define keys with one being bisteble
operation. Debounce circuit provided for all 19 keys.
9 LED readouts to verify entries. Easy interfacing with
standard 16 -pen IC connector. Only +5VDC required
for operation. Size: 395'1111 x 810 "W x 89 -D
(
'
JE600 /DTE -HK
as
áfcëure
el
.
-
$99.95
JE600 Kit lvcëóard4cmóni:¡ñócrás'a)..$59.95
K19 1s-Key Keyboard (Keyboard only) .... $14.95
DTE -HK (case only - 387 "Hx80 °WDOOa "D) $44.95
CIRCLE NO. 27 ON FREE INFORMATION CARD
113
Memory
16K
4116 -200ns
CALL US FOR VOLUME QUOTES
ALL MERCHANDISE 100% GUARANTEED!
r
EPROMS
1702
2708
2758
TMS2516
2716
2716-1
TMS2716
TMS2532
2732
2764
256 x 8
1024 x 8
1024 x 8
2048 x 8
2048
2048
2048
4096
4096
8192
x
x
x
x
x
x
(5V)
(5V)
(5V)
(5V)
8
8
8
8
8
8
(5V)
(5V)
Each
8 pea
4.95
4.50
2.99
2.75
9.95
8.95
6.95
5.95
5.50
4.95
9.00
8.50
9.95
8.95
12.95
11.95
(45Ons) (200ns)
CALL
(1ns)
(450ns)
(450ns)
(450ns)
(450ns)
(350ns)
(450ns)
(450ns)
CALL
(5V) (45Ons)
DYNAMIC RAMS
4027
4116.120
4116 -150
4116 -200
4116 -300
4164
4096
16,384
16,384
16,384
16,384
64,536
x
1
x
1
x
x
(250ns)
(200ns)
(300ns)
(200ns)
1
1
x
1
2.50
8/29.95
8/18.95
8/15.95
8/14.95
(12Ons)
(15Ons)
1
x
100 pea
2114L-4
2147
TMS4044-4
TMS4044-3
TMS40L44-2
TMM2016
HM6116
256 x 4
1024 x 1
1024 x 1
1024 x 1
(4500s)
(450ns)
(LP) (450ns)
(LP) (250ns)
258x4
(45Ons)
256
1024
1024
1024
1024
4096
4096
4096
4096
2048
2048
x 4
x 4
x 4
x 4
x 4
x 1
x 1
x 1
x 1
x 8
(LP)
(LP)
(LP)
(LP)
x 8
L
1.95
1.80
1.75
CALL
STATIC RAMS
2101
2102-1
21 L02-4
21 L02-2
2111
2112
2114
2114L-2
2114L-3
2.00
CALL
100 pcs
1.95
.89
1.29
1.69
1.85
.85
1.15
1.55
2.99
2.49
(450ns)
2.99
2.79
(450ns)
1.95
8/16.95
(200ns)
2.35
8/19.95
(300ns)
2.25
8/18.95
(450ns)
8/17.95
2.10
(55ns)
9.95
CALL
(450ns)
3.49
3.25
(300ns)
3.99
3.75
(200ns)
4.49
4.25
(200ns) (15Ons)
CALL
(200ns) (15Ons) (12Ons) CALL
LP = LOW POWER
8115 .95
r April Specials r
r- CRYSTALS
32.768 KHZ
1.0 MHZ
1.8432
2.0
2.097152
2.4576
3.2768
3.579545
4.0
5.0
5.0688
5.185
5.7143
6.5536
8.0
10.0
14.31818
18.0
18.432
20.0
22.1184
3.95
4.95
4.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
3.95
32.0
CPU 6MHZ
Z80A
CPU 4MHZ
Z80A
PIO 4MHZ
68000
CPU 4 -10MHZ
6802
MPU, CLK, RAM
6845
CRT CONTROLLER
6502A
CPU 2MHZ
6502B
CPU 3MHZ
8086
16 BIT CPU
8088
8 BIT CPU
8089
8/16 BIT PROC
14 Pin Gold Wirewrap Sockets
16 Pin Gold Wirewrap Sockets
Z8OB
74LS00
74LS01
74LS02
74LS03
74LSO4
74LS05
74LS08
74LS10
74LS11
74LS12
74LS13
74LS14
74LS15
74LS20
74LS21
74LS22
74LS26
74LS27
74LS28
74LS30
74LS32
74LS33
74LS37
74LS38
74LS40
74L542
74LS47
74LS48
74LS49
74LS51
74LS54
74LS55
74LS63
74LS73
74LS74
74LS75
74LS76
74LS78
hiZ4LS83
.25
.25
.25
.25
.25
.25
.35
.25
.35
.35
.45
1.00
.35
.25
.35
.25
.35
.35
.35
.25
.35
.55
.55
.35
.35
.55
.75
.75
.75
.25
.35
.35
1.25
.40
.45
.50
.40
.50
.75
74LS85
74LS86
74LS90
74LS91
74LS92
74LS93
74LS95
74LS96
74LS107
74LS109
74LS112
74LS113
74LS114
74LS122
74LS123
74LS124
74LS125
74LS126
74LS132
74LS136
74LS137
74LS138
74LS139
74LS145
74LS147
74LS148
74LS151
74LS153
74LS154
74LS155
74LS156
74LS157
74LS158
74LS160
74LS161
74LS162
74LS163
74LS164
74LS165
HOURS: Mon.
-
1.15
.40
.65
.89
.70
.65
.85
.95
.40
.40
.45
.45
.50
.45
.95
2.99
.95
.85
.75
.55
.99
.75
.75
1.20
2.49
1.35
.75
.75
2.35
1.15
.95
.75
.75
.90
.95
.95
.95
.95
.95
74LS166
74LS168
74Lâ169
74LS170
74LS173
74LS174
74LS175
74LS181
74LS189
74LS190
74LS191
74LS192
74LS193
74LS194
74LS195
74LS196
74LS197
74LS221
74LS240
74LS241
74LS242
74LS243
74LS244
74LS245
74LS247
74LS248
74LS249
74LS251
74LS253
74LS257
74LS258
74LS259
74LS260
74LS266
74LS273
74LS275
74LS279
74LS280
74LS283
74LS290
Fri., 9 to 5; Sat.,
11
2.40
1.75
1.75
1.75
.80
.95
.95
2.15
9.95
1.00
1.00
.85
.95
1.00
.95
.85
.85
1.20
.99
.99
1.85
1.85
.99
1.90
.76
1.25
.99
1.30
.85
.85
.85
2.85
.65
.55
1.65
3.35
.55
1.98
1.00
1.25
to
74LS293 1.85
74LS295 1.05
74LS298 1.20
74LS324 1.75
74LS352 1.55
74LS353 1.55
74LS363 1.35
74LS364 1.95
74LS365
.95
74LS366
.95
74LS367
.70
74LS368
.70
74LS373
.99
74LS374 1.75
74LS377 1.45
74LS378 1.18
74LS379 1.35
74LS385 1.90
74LS386
.65
74LS390 1.90
74LS393 1.90
74LS395 1.65
74LS399 1.70
74LS424 2.95
74LS447
.37
74LS490 1.95
74LS668 1.69
74LS669 1.89
74LS670 2.20
74LS674 9.65
74LS682 3.20
74LS683 2.30
74LS684 2.40
74LS685 2.40
74LS688 2.40
74LS689 2.40
81LS95 .1.69
81LS96
1.69
1.69
81LS97
1.69
81LS98
12.50
13.95
4.95
7.95
9.00
3.95
4.50
9.50
9.95
12.95
3.95
3.95
7.99
1M6402
120ns 18.95ea 17.95ea
150ns 11.95ea 10.95ea
200ns 10.95ea 9.95ea
Specials end April 30, 1982. Please state
1.50
74C00
74CO2
24.95
36.95
44.95
54.95
39.95
6.95
3.95
4.95
7.95
1.69
2.49
.99
.99
.99
.99
2.95
1.29
CLOCK
CIRCUITS
MM5369
MM5375
MSM5832
7207
7208
3.95
3.95
7.45
7.50
15.95
CONVERTERS
MC1408 L8
DAC -0800
ADC -0804
4.95
4.95
4.95
I
74C04
74C08
74C10
74C14
74C20
74C30
74C32
74C42
74C48
74C73
74C74
74C76
74C83
74C85
74C86
74C89
74C90
74C93
74C95
74C107
74C150
74C151
74C154
74C157
74C160
74C161
74C162
76C163
74C164
74C165
74C173
74C174
74C175
74C192
74C193
74C195
74C200
74C221
4C373
114
7
12.95
6.95
8.95
9.95
4.35
9.95
14.95
11.854
Z80
Z80-CPU
Z80A-CPU
Z80-P10
Z80A-P10
Z80-CTC
Z80A-CTC
Z80-DART
Z80A-DART
Z80-DMA
2130A-DMA
Z80-S10/0
Z80A-S10/0
Z80-S10/1
Z80A-S10/1
Z80-S10/2
Z80A-S10/2
Z80-S10/09
Z80A-S10/9
8.95
6.00
6.50
6.00
5.95
8.65
15.25
18.75
17.50
27.50
23,95
28.95
23.95
28.95
23.95
28.95
17.95
22.95
Z80B-CPU
Z80B-CTC
280B-P10
18.95
17.95
17.95
Z8671
6132
39.95
34.9_54i
CMOS
.35
.35
.35
.35
.35
1.50
.35
.35
.50
1.75
2.10
.65
.85
.80
1.95
1.95
.95
74C374
2.75
74C901
.80
.85
.85
4.50
74C922
74C923
74C925
74C926
74C927
74C928
74C929
74C930
1.75
1.75
1.75
1.00
5.75
2.25
3.25
1.75
2.00
2.00
2.00
2.00
2.00
2.00
2.00
2.25
2.25
2.25
2.25
2.25
5.75
2.25
2.75
74C902
74C903
74C905
74C906
74C907
74C908
74C909
74C910
74C911
74C912
74C914
74C915
74C918
74C920
74C921
4000
4001
4002
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
10.95
.95
1.00
2.00
2.75
9.95
10.00
10.00
1.95
2.00
2.75
17.95
15.95
5.95
5.95
6.75
7.95
7.95
7.95
19.95
19.95
.35
.35
.25
.95
.29
.95
.45
.45
.35
.25
.45
.95
.95
.45
1.15
.95
.45
.95
4098
4099
4021
.95
14409
4022
4023
4024
4025
4026
4027
4028
4029
4030
4034
4035
4040
1.15
.35
.75
14410
.35
14419
1.65
4502
4503
4508
4510
4019
4020
.65
.80
.95
.45
2.95
4069
.85
.95
1.25
.75
.85
.85
.95
.95
.55
.55
.95
.95
1.45
.75
.40
.35
4070
.35
4071
.30
.30
4041
4042
4043
4044
4046
4047
4049
4050
4051
4053
4060
4066
4068
4072
4073
4075
4076
4078
4081
4082
4085
4086
4093
14411
14412
4511
4512
4514
4515
4516
4518
4519
4520
4522
4526
4527
4528
4531
4532
4538
4539
4543
4555
4556
4581
.30
.30
.95
.30
4582
4584
4585
4702
4724
.30
.30
.95
.95
.35
80007
80C95
80C96
80C97
80C98
2.491
1.95
12.95
12.95
11.95
12.95
4.95
.95
.65
1.95
.95
.95
.95
1.25
2.25
1.55
1.25
1.25
1.25
1.25
1.25
1.95
1.25
.95
1.95
1.95
1.95
2.70
.95
.95
1.95
1.95
.95
.95
12.95
1.50
.95
.85
.95
.95
1.2
VISIT OUR RETAIL STORE!
3
JDR MICRODEVICES, INC.
master charge
J
L"April Specials" when ordering.
INTERFACE
8726
8728
8795
8T96
8T97
8798
DM8131
DS8836
59.95
34.95
89.95
.49ea
.59ea
STANDARD POWER RAMS
UARTS
AY3-1014
AY5-1013
TR1602
9.95
HM6116P -2
HM6116P -3
HM6116P -4
DISC CONTROLLERS
1793
1797
UPD765
r
call
2716 EPROM. Super low power data
retention characteristics: 2.0 volts at
only 50ua yes 50 mlcroamps.
1 -31 pcs.
32 pcs.
HM6116LP -2 12Ons 19.95ea 18.95ea
HM6116LP -3 150ns 16.95ea 15.95ea
HM6116LP -4 200ns 15.95ea 14.95ea
MISC.
1771
1791
8.95
15.95
17.95
6.00
6.00
SUPER SPECIAL
I
r74LS00 SERIES
15.95
6502-A
6504
6505
6507
6520
6522
6532
L.9551
Hitachi HM6116LP 2048 x 8 CMOS
Static Ram pin compatible with the
3.95..
AY5-2376
11C90
XR2206
3242
3480
MC4024
MC4044
7103
7106
7107
76477
8038
95H90
9602
6502
6502
1224 So. Bascom Ave.
San Jose, CA 95128
800 -662 -6279 (CA)
800 -538 -5000
(408) 995 -5430
Telex 171 -110
TERMS: For shipping include $2.00 for UPS ground, $3.00
for UPS Blue Label air. $10.00 minimum order. Bay Area
residents add 61/2% sales tax. California residents add 6%
sales tax. We reserve the right to lini: quantities and substitute manufacturer. Prices subject to change without
notice. Send SASE for complete list.
POPULAR ELECTRONICS
2%1 s
ALL MERCHANDISE
I
8000
3.95
12.95
16.95
99.95
39.95
11.95
11.95
8185-2
29.95
39.95
8741
39.95
8748
29.95
8185
`755
r-
44.95
6800
6802
6808
6809
6809E
6810
6820
5.70
10.95
9.95
24.95
29.95
4.60
4.95
6821
4.95
6828
6834
6840
6843
6844
6845
6847
6850
6852
6860
6862
6875
6880
14.95
16.95
14.95
42.95
44.95
16.95
15.95
4.75
5.75
10.95
11.95
6.95
2.95
68B00
10.95
12.95
12.95
68B21
.68850
LM741
LM1310
LM1800
01889
4.45
14.95
4.75
9.25
9.85
4.75
5.25
8.75
6.90
39.95
29.95
9.50
10.50
6.65
6.65
5.70
6.65
6.50
25.00
8253
8253.5
8255
8255-5
8257
8259
8272
8275
8279
8279-5
8282
8283
8284
8286
8287
8288
6800
MC1330
MC1350
MC1358
LM380
LM386
LM565
1.85
3.85
1.80
2.50
1.80
4.90
19.95
4.95
4.85
8251
r
1.89
1.29
1.79
1.29
1.50
.99
.29
2.90
7805K
7812K
7815K
78L05
78L12
78L15
Jumbo Red
1( /1.00
Jumbo Green
E/1.00
Jumbo Yellow
E11.00
5082- 7760.43'CC
.79
MAN74.3'CC
.99
AN72 .3'CA
LM3C9K
LM317T
`=
.995
r
-0-220
1.49
1.95
.89
.89
1.19
1.19
791ST
7924T
7905K
7912K
79_12
79_15
1.49
1.49
.79
.79
.79
LM317K
LM323K
LM337K
3.95
4.95
3.95
79_05
K = TO-3
L=
TO-92
74S00 SERIES
.44
.48
74S03
74SO4
.48
.79
74505
74S08
74S09
74510
74511
74515
74520
.79
.48
.98
.69
.88
.70
.68
74S22
74S30
74S32
74S37
74S38
.98
.48
74571
74585
74883
745112
745113
745114
745124
745132
745133
745134
745135
743138
745139
745140
743151
745153
743157
745158
743131
743152
.98
1.87
1.68
.44
.78
.79
1.25
74540
74551
74S64
74S65
HOURS:
Noi.
.6d
2.33
1.44
1.53
1.93
1.53
2.77
1.24
.93
.63
1.43
1.03
1.2-3
1.43
1.13
1.13
1.13
1.45
2.83
3.73
-
745163
745168
745169
745174
745175
745181
74S182
745188
745189
745194
745195
745196
745197
745201
745225
745240
745241
745244
3.75
4.65
5.44
1.09
1.09
4.47
2.95
3.95
14.95
2.95
1.89
4.90
4.25
14.95
745257
745258
745260
745274
745275
745280
8.95
3.98
3.75
3.98
745.251
1.90
7.45
745412
745471
745472
745474
74S482
715570
745571
745253
74S287
745288
74S289
745301
715373
745374
74S381
74S387
1.3e
1.43
1.83
19.95
19.95
2.93
4.73
4.45
6.95
6.93
3.45
3.45
7.95
5.75
2.98
-
9.95
16.85
17.85
15.60
7.80
7.8(
LM301V
LM308V
LM309K
LM311
LM317T
LM317K
LM318
LM323K
LM324
LM337K
LM339
LM377
LM380
LM386V
LM555V
LM556
LM565
LM566V
LM567V
LM723
LM733
LM741V
LM747
LM748V
LM1310
MC1330V
MC1350V
MC1358
LM1414
LM1458V
LM1488
LM1489
LM1800
LM1889
LM3900
LM3909V
LM3914
LM3915
LM3916
75451V
75452V
28 pin WW
40 pin WW
APPLE IS A TRADEMARK
`5453V
2.99
2.49
.59
.98
3.95
3.95
3.95
.39
.39
.39
APRIL 1982
.11
.59
.69
.69
.99
1.09
1.39
1.49
1.69
1.99
.49
.52
.58
.90
.98
1.28
1.35
1.49
1.80
25/ 1.00
1.004
3.25
3.75
1.25
3.95
4.95
DIP SWITCHES
50/10.99
50/10.99
10/ 6.99
100/ 8.99
100/ 8.99
4
5
6
7
LI
POSITION
POSITION
POSITION
POSITION
POSITION
.85
.90
.90
.95
.95
J
7400 SERIES
7400
.19
7451
.23
74136
7401
.19
.19
7453
7454
7460
.23
7402
7403
.23
74141
74142
.23
74143
7404
7405
7406
7407
7408
7409
7410
.19
7470
7472
7473
7474
7475
7476
7480
.35
.29
74144
74145
74147
74148
74150
r
.19
7421
.22
.22
.22
.24
.19
.19
.25
.30
.35
.55
.25
.25
.19
.35
7422
7423
7425
7426
7427
7428
7430
7432
7433
7437
7438
7440
7442
7443
7444
7445
7446
7447
7448
L7450
.29
.29
.29
.29
.29
.45
.19
.29
.45
.29
.29
.19
.49
.65
.69
.69
.59
.69
.69
.19
7411
7412
7413
7414
7416
7417
7420
7481
7482
7483
7485
7486
7489
7490
7491
7492
7493
7494
7495
7496
7497
74100
74107
74109
74110
74111
74116
74120
74121
74122
74123
74125
74126
74128
74132
.34
.35
.49
.35
.59
1.10
.95
.50
.65
.35
4.95
.35
.40
.50
.49
.65
.55
.70
2.75
1.00
.30
.45
.45
.55
1.55
1.20
.29
.45
.55
.45
.45
.55
.45
74151
74152
74153
74154
74155
74156
74157
74159
74160
74161
74162
74163
74164
74165
74166
74167
74170
74172
74173
74174
74175
74176
74177
74178
74179
74180
74181
74182
74184
74185
.65
74186
74190
2.95
2.95
74192
.50
2.95
.60
1.75
1.20
1.35
.65
.65
.55
1.40
.75
.65
.55
1.65
.85
.70
.85
.85
.85
.85
1.00
2.95
1.65
5.95
.75
.89
.89
.89
.75
1.15
1.75
.75
2.25
.75
2.00
2.00
74193
74194
74195
74196
74197
74198
74199
74221
74246
74247
74248
74249
74251
74259
74265
74273
74276
74279
74283
74284
74285
74290
74293
74298
74351
74365
74366
74367
74368
74376
74390
74393
74425
74426
74490
18.50
1.15
1.15
.79
.79
.85
.85
.79
.75
1.35
1.35
1.35
1.35
1.25
1.85
1.95
.75
2.25
1.35
1.95
1.25
.75
2.00
3.75
3.75
.95
.75
.85
2.25
.65
.65
.65
.65
2.20
1.75
1.35
3.15
.85
2.55
VISIT OUR RETAIL STORE!
JDR MICRODEVICES, INC.
i+.
.12
.13
.18
.27
.27
.27
.32
.39
CONNECTORS
100/ 8.99
10/
too
.13
.15
.17
.20
.29
.30
.30
.40
.49
RS232 MALE
RS232 FEMALE
RS232 HOOD
S-100 ST
S-100 WW
TRANSISTORS
1 N 4004
1-99
WW = WIREWRA'
OF APPLE COMPUTER INC.
FH., 9 to 5; Sat. 11 to 3
master charge
NOISE
20 pin WW
PN2222
10/1.00
2N2222
.25
2N2907
.25
2N3055
.79
2N3904
10/1.00
2N3906
10/1.00
1N4148 (1N914)
.34
.98
1.49
.64
1.95
3.95
1.49
4.95
.59
3.95
.99
2.29
1.29
1.50
.39
.69
.99
1.49
1.29
.49
.98
.29
.79
.59
2.90
1.89
1.29
1.79
1.59
.69
.99
.99
pin WW
14 pin WW
16 pin WW
18 pin WW
22 pin WW
24 pin WW
r
LINEAR,
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST = SOLDERTAIL
8
78.50
108.50
154.50
(CALIFORNIA RESIDENTS)
1.39
1.39
1.39
.69
.69
.69
pin
pin
16 pin
18 pin
20 pin
22 pin
24 pin
28 pin
40 pin
MOTOR
800 -538 -5000
800 -662 -6279
7905T
7912T
LOW
LONG LIFE
IC SOCKETS
8
14
-
2.49_44
VOLTAGE REG's
7824-
r
SAVES REPAIR CHARGES
INCREASES RELIABILITY
NO HOLES OR
CLIPS ON
SCREWS
COLOR MATCHES APPLE
2.99
WE WILL BEAT ANY COMPETITORS' PRICES
7815'
$69.00
ULTRA -QUIET APPLE FAN
DRAWS COOL AIR THROUGH
YOUR COMPUTER
ELIMINATES DOWN TIME
ALL ARE HIGH QUALIT'r" UNITS ENCLOSED IN
A BLACK ANQDIZED ALJM NUM ENCLOSURE
.79
.99
.79
.99
.99
VOLUME QUOTES
EXTRA PLUG -IN CARDS CAN
CAUSE YOUR APPLE TO
OVERHEAT
PE-14
PE-14T (with timer)
PE -24T (with timer)
7805T
7808T
7812T
US FOR
APPLE FAN
CALL JDR BEFORE YOU BUY!
LEDS
74500
74502
CALL
EPROM ERASERS
49.9U
le89
GUARANTEED!
TV
CIRCUITS
45.00
3.50
8202
8205
8212
8214
8216
8224
8226
8228
8237
8238
8239
8243
8250
19.95
100%
Ì
8200
16.95
8035
8039
8080A
8085
8085A-2
8086
8088
8155
8156
814.95 ea.
EPROMS 450NS (5V)
1224 S. Bascom Ave.
San Jose, CA 95128
800 -538 -5000
800 -662 -6279 (CA)
(408) 995 -5430
Telex 171 -110
CIRCLE NO. 28 ON FREE INFORMATION CARD
For shipping include $2.00 for UPS Grounc, $3.00
for UPS Blue Label Air. $10.00 minimum order. Bay Area
residents add 61,'2% sales tax. California residents add 6%
sales tax. We reserve the right to limit quantities and substitute manufacturer Prices subject to change without
notice. Send SASE for complete list.
TERMS:
115
Make Ratio Shack Your Parts Place®
Reasonable Prices!
No Waiting!
100% Prime Parts!
Transistor Sockets
Our Versatile "Helping Hands"
A Builder's
Best Friend!
100k -Ohms
169
Top Quality at
A Low Price
Pkg.
Of 6
Four -pin type with mounting flange.
276-548
Holds Work in Any
Position, Leaving
Both Hands Free
199
Rated 3 Amps
At 12 Volts DC
Handle lights in "on" position. Ideal for
projects or vehicles. Mounts in a rhe"
hole. 12VDC use only. 275-706
1.99
....
oHigh- Output
Infrared LED
1.5VDC Buzzer
Slope -Front
Desktop Cabinet
Super Loud
Low Current
Drain
Ideal for transistorized security applications, 1.5 to 3VDC. Round metal case
with leads. 273 -004
is fully adjustable.
276-1568
5
Spring- action, solder -type, 1'12"
long. One red, one black.
270 -370
Set of 2/1.49
..,......
6 95
x 5 cm Solar Cell
-._---
1
19
Cadmium Sulfide
Photoresistor
`---
239
24 -Ga. Solid Copper
Flexible flat cable ideal for intercoms,
low- voltage hookups.
2- Conductor. 35 ft. 278.755
4- Conductor. 25 ft. 278 -757
2
2
39
39
DPST Reed Relay
595
First- Quality
Device, Not a Mall
Order "Second"
119
Low Power
Consumption
Frees your hands for easier soldering and repair.
Holds board securely, yet
a
Set
Of 2
Rainbow Wire Packs
695
Fun Project!
149
XC880 -A. Emits as much energy
as three conventional IR LEDs!
Good spectral match for photodiodes. 1.3VDC, 20 milliamps.
1 49
276-143
PC Board Holder
Mounts on Bench
Or in a Vise
SN76477. Creates music, explosions,
arcade sounds and more with simple support circuitry. 28-pin DIP with data.
Sale 2.99
276 -1765
Ideal for Testing
On Packed PC Boards
149
Primary: 120VAC. Sec.: 18VAC at
2 amps, center tapped. 2314 x 2'/ x 2 ".
273 -1515
6 99
Off
Heart of
Micro Test Clips
699
1/3
2 99
Twin pots controlled by a single one inch shah. Body: 1'/,e" square. Solder
4 95
lugs. 271 -1705
Heavy -Duty
Steel Frame
Sound Generator IC
Reg.
4.49
Pkg. of 6/1.69
Power Transformer
With this accessory, "tough" jobs like soldering coax connectors or glueing small
parts become easy. Has a sturdy cast iron
base, plus six ball joints which allow its
two nickel -plated clamps to adjust to any
angle. Put the "Helping Hands" on your
bench today... you'll be glad you did the
7 95
first time you use it! 64 -2093
Illuminated SPST
Toggle
Joystick Pot
495
For In -Line
Or Triangle
Pin Patterns
Only
Buy several to charge batteries or power
projects. Approx. 0.42VDC at 0.5 amp in
5 95
bright light. 276-125
99°
5VDC, 180 -Ohm Coll. Contacts rated
0.5 amp at 120VAC. Can be mounted
on PC board. 275-228
99e
Let Radio Shack Introduce You to the
Fascinating World of Microcomputing!
Wide
NOW.°
Resistance
Range
849
megs in darkness to
100 ohms in bright light.
Ideal for intrusion alarms,
5
Ideal for test equipment, mixers, control
panels. 7'/e x 57/e x 1'/a" (front), 23/4" (rear).
270 -265
8 49
counting, model railroads
and more.
1 29
276 -116
Add the "Pro" Look to Your Wiring Job!
Spiral Wrap
219
Pkg.
Of 2
Spiral Wrap. Neatly bundles wiring. Set
includes 5 ft. of clear, 5 ft. of black.
Set, 2.19
278 -1638
Cable Clips
169
Set
Of 10
Universal Cable Clips. Accepts cable or
wiring up to 'h" diameter. Self- adhesive
back. 278 -1639
Set of 10 /1.69
An American Electronics Tradition
For Over Sixty -One Years
Prices may vary at individual stores and dealers
116
E Computer Demonstrator. It's an actual working computer (made
from paper) plus an easy -to -read, 24 -page manual that explains comOnly 3.95
puter terms and operation. 62-1080
B Beginners Guide to Personal Computers. By Forrest Mims Ill.
Covers uses and capabilities of personal computers in plain language.
1 95
Illustated. 80 pages. 62 -2003
TRS -80 Level II BASIC. A self- teaching guide to BASIC computer
9 95
language. 351 pages. 62 -2061
ti Microcomputer Dictionary. An authoritative, up -to -date reference.
7 95
606 pages. 62 -2311
ftadie ¡haeK
A DIVISION OF TANDY CORPORATION
OVER 8200 LOCATIONS IN 76 COUNTRIES
POPULAR ELECTRONICS
DIDI-KEY 800-346-5144
C O R P O R A T
PANSÇn
NATIONAL SEM,ONmr ICToP
R1a"CD
AAVID CUEV
- WIK
D.A.
NAT IONAL SEMICONDUCTOR
DIGI KEY
-KEY
01
IRS
-
Volumee Discounts
24611ET
Z270
...a
II
;38710
174713'
DIOS.
STRUNTS
X
OEM Ouantity Pricing
Ilru IIl, hill
II
Toll Free
Et
V
r
150 CAPACITORS
Solder Tail
.
_./
^
-
-
NEW!
Loi No
-
II
ONI
P
IT
=cçFY
P.
° "`
4MON^
TOOL
^
ÿ{ICL
NGAR
GC CH
CHEMICALS ARIES
PLESSEY MOLEX E.
GC
IOI -DEY- 0101 -KEY- DIGI.KEY -0101- KEY
IOIIEY 0101KEY DICI. KEY 0101-KEY
et
r'
- DCGI.KEY-- DIGI KEY
- DK:I.KEY
((
.. 0
TANTA'.
1 LL
KIT
NEW.
KIT
$7995
TL
outs so Rho
metro. Ise,
01 the IC
man
ali
Panasonic LS Series
35
00
3
77
Mini 11,6 Aluminum EIBCIrolyIIC Capacho
St1
ITT RECTIFIERS
wr
Ill
TIN
Plothd
Tin Plated
$0 L OK
tow
Semle
100
44200
133
17:17
PIOlAR Ow Sockels
200
Min.
a
,m
zv.
090
3
e
to +IBC
40°
OD
01010
011
50
&.nom
SILICON
ITT
MICrolnch
Min.
e 15
ant
62
331
2e
34010
s 43
4514
634
4,4
ZEN. DIODES
10
000
NEW!
to +125C
a
a
3B
KIT
52
05
14
PANASONIC POLYESTER CAPACITORS
100
444.44.519ti MIRA/Kt
TAO
LL
ób
3323
)'
r
49
Gold Plated
I,.
Ie
3
GOLD
Gold Inlet' Solder Twl
SIYEN
Inn Profile 5011.11
2
42
78
MicroincM1
rm
REY
.
CAPACI
E
OPRS
53595
Dip Sockets
DICI
DIGI KEY
DICKEY
0101 -KEY
PANASONIC
06300
O NLY Y
itaeQ=N
Engle axle
"EA41CP'
A. HING
IN
AS UNSTRUMT,R
ROO Number CHEMICALS ARIES
P
AMP SILICON RECTIFIER
3
I.C. SOCKETS
4116
1070 6747;
L
SAVINGS
I
ac 18,3891 Dynamic Rem
400
PANASONIC
O
Y
- -KEY -01 IKEY - DIGI -KEY - DIOIKEY - RIDI.KEY - DIGT
-- DIOI
DIGI -KEY - 0101-KEY - 0IOSKEY - 0101-KEY - 0101-KEY - OIOSKEY -
INTEGRATEÜ
411991 NO
JI
Ai
F
In Mn., Ak.. Hi. CDII 218-081.6674
- Name brand Pproducts from national/ recognized manufacturers.
SER VICE - Computerized order processing and inventory control.
OUALITY
N.
ARIES
PLESSEY MOI EY
SAVIO
E
OK MACHINE
UNGAR
GC CHEMICALS
VISA
DIGS KEY
,,,
O N
I
=
91
401
gt
0i1
os
iqii
334
321
124
2670
264C
th 40
'41
gig
34030
trg
=A
NV'r.
740
gig
tr,
RAP
$3495
011,6001011
;'m
Ia
36
5
09
7670
21
1
13403
IS
t.
3013
364
3
3t1
11010
16
2
41
52
ea
1
3A
mñ
371
h
o
tt
2810
10
71
211 10
1'77
Fi7
28 35
an
3
10
.00
1200
44
1
70
1
PANASONIC METALLOID POLYESTER
WO 03,
11,75
le 71
70
90
42
220o
25
L
NEW!
s
2
11
EIT
40
0
TEXAS INSTRUMENT
EDGEBOARD CONNECTORS
sS495
-Li,i;:."
4:I
43N
ILIA"
.
,
Caper nir.41,1C11 /11 okay
twi
I
25493
1160
296 20
915
1610
161 60
BO
50
4
AO
605
14
73
F
Seise, Lynabbrys
PANASONIC E-SERIES CAPACITORS
FA F5
31
26;
7e
3065
3345
131
1
11
0
rig
73
l
562
rtti
40
17 SO
t
S
4 44
12
.11
nn
10
1653
28 33
303
TANTALUM SUBSTITUTES
55 75
11
eu
'ILI
199
Panew
li
. :w,'rk":.
.i
23
75
71
12
15
69 13
'LOP
0
PO, 01
40
I 45
IS
JSf
1,3
17 50
17
gg
75
95S
:8:6.: n54:
11475
94
56.3
32
NNN
164
3,2
71
17
70
750 1001130RO CONNECTORS
Panasonic TSW Series
110 CO
166 50
77
1.5
tete Akwum E W.II.lfl C1P11mrt
77
6 90
...
..
..
9503
TIME-TEMPERATURE
PROGRAMMABLE MODULE
USER
10000
0 77
.......
59.90
P0507
P6500
S9.90
.
nil,
WATT RESISTO_ RS ASSORTMENTS
P0511
P11512
.
P0513
RSI50
-
IS150
IMO
-
L-
59.90
Cat
200
,.,..
.,.
N0
Ki1
ONLY
,-.or1,s.uin.1ie
1.2985
PROGRAMMABLE YOR:
799
77
S7 50
SiáiEIASòRTMEÑTY1
macs
1:417
Mil
P65.2.2
MO
66
43
47
57
11
I1:7
NEW
Digital
14
01
47
P9,5e
os
.0
4700
5900
470
403
OP
400
044
34
MSMSA32 MICROPROCESSOR
REAL-TIME CLOCK /CALENDAR
SO
093
OA
2,9
15
7440
.993
7
93
2
93
ÚNIY[
15 53
130 73
ARS
l
iMFID80EDINL
RI. MOMS f
7015
2440
02
IWL -IN
ILIMitil
TR POINTS
ICOD
234
113
17
41
SS
tri
ctlons
I
All Orders
las Included In
Of
IOW
Clock Module
coow
771
.00
MA1032 Clock
LCD
3345
s1;
Sj9pai
21700
P13620
ph.,
6523
41
S6
IMO
2200
3300
4700
TO.
50
330
21,
4000
6090
10300
.0
MI5
P6516
P6617
9.6516
P6519
72
225
'
TR V,
776
16
TRE>;
21
ISO
105
7;
17
It
R5125
61
313
111,309
F
1.
072
027
033
01 OD
OB
1
19
Ft 173
5315
j2:=L=M
nol^TT.^4.-P.7R4=
SOLO
24.95
1133
2.85
FEATURES
uon.
0
ea
m,217.20
D /Ci- CLUE11
"PROGRAMMABLE"
Von ro
S
2
DIT
12 VDE
THE
IsOWERACE
35
14.1037111.x1031C.su
1as
59
1016 AL
15
VS
1,40 CAPACO
bat!
CAI
NO
305OP -Kit
CLOCK MODULES
ONL
00Tmeen
maw
.n M..
Spalle
ONLY01795
The 0191-Key volume discount and handling charges are simple to apply. Most Items sold by
Or 14
Y
$3595
1107 CAPACITORS
DIGI -KEY Stocks Most A.P. Products
Call or Write For 00111
FREE DIGI -KEY Catalog
DIGI-KEY Volume Discount
HANDLING CHARGES
DigiKe9 may be combined for o volume discount Items that ore not discountable ore Identified by ,,,e
suffix-ND following the port number. After writing your order, total all of the discauntoble items and apply the oppropriote discount. To this subtotal. odd the non -discountable items. Then
odd
S
the handling chm90. We pay all shipping and Insurance to addresses in the U.S.A., Canada and Mexico when check or money
0.00.4 9.99
order accompanies order.
S 10,00 -425.00
WHIM ORDERING 171 PNORI, CALL: 1300.346.5144 INK., AA., NE o.0 218.681.6174) 01 Ned seed yew eider Ni DIGI.EEY, NigNwq
32 Welk Thiel River Nils, MN 50701
S 25.00.549.99
You may pay by check, money order, Master Charge, VISA or C.O.D.
Any ports or products purchased from Digi.Key Thot prove to be defective will be 4 50.00499,99
replaced or refunded if returnod within 90 days from receipt with o copy of
4100,00 a Up
Pnces subject to change without notice.
Your invoice.
DIGI-KEY GUARANTEE:
CIRCLE NO. 11 ON FREE INFORMATION CARD
Compare the
0..1 when
comparing Price
VOLUME DISCOUNT
0.00 -1 99.99
Add $2.00 S
Add 10.75 S 100,00 -4249.99....
Add 50.50 E 250.00.5499.99
Add 40.25 4 500.00- 5999.99....
No Charge K1000.006 Up
NET
Less 10 °.
.... Less 15°.
Less 70.
Less 25 °.
Classified Advertising Cont'd from pg 125
lkpular Electionics
MUSICAL INSTRUMENTS
ADVERTISERS INDEX
RS no.
PAGE no.
ADVERTISER
Albia Electronics
All Electronics Corp.
AP Products
Apple Computer
Audio -Technica
3
4
5
6
7
Kartes Productions
12
32
50
Maxell
MFJ Enterprises
McGraw -Hill
McIntosh Laboratory, Inc
Micro Management Systems
12
17
67
20
119
104
22
24
Heath Co
Hewlett- Packard
25
Illinois Audio
WERSI ORGANS, most 1h price, some even less. RIEMANN,
4747 E. Lee, Tucson, Arizona 85712. 602 -325 -5421.
72 -75
VIDEOTAPES - 8MM716MM MOVIES. TWO 72 page catalogs $1.00. Both $1.50. Reelimages. Box 137 -PE, Monroe,
Connecticut 06468.
11
21, 87
34 -37
89
MOTION PICTURENIDEO
88
84
110, 111
100
39
40
PAIA Electronics
Percom
Personal Computer Systems
Poly Paks
98
41
Quest Electronics
120
Radio Shack
14, 15 R.L. Drake
14
9, 53 -55
Cover 3
44
45
98
116
67, 102
Scientific Systems
Simple Simon Kits
Sinclair Research
43
86
Jameco Electronics
JDR Microdevices
Jim Pack
J&R Music World
JS & A National Sales
102
95
4, 5
Tab Books
Tams
Tektronix
39
102
3
43
85
112, 113
114, 115
46
Trio -Kenwood
108
79
49
11, 13, 15
48
Westland
Wildfire Publication
Wisconsin Discount Stereo
47
FINALLY! An affordable 35mm Camera. Yunon DX -5. Focus Free. Case included. Guaranteed. $29.95 ppd. JARCO, P.O.
Box 721 -PE1, Bettendorf, IA 52722.
2
84
104
84
PHOTO EQUIPMENT SUPPLIES
15
83
3 -M
27
28
29
30
BAGPIPES $60 Up. Practice Chanters $15. Brochures $2.
Mideast Inc., 2817 Cameron, Melbourne, FL 32901.
24
88
62 -65
99
105
Ohm
OK Machine
Omega Sales Corp.
38
Gladstone
Global Specialties
Grantham College of Engineering
21
35
36
Cover 4
Firestik
Fireworks Unlimited
18
19
7
MUSICAL INSTRUMENTS' HOT LINE! Incredible prices:
Amps, PA gear. All instruments. Huge selection. Sam Ash,
established 1924. 800- 645 -3518. NYS: (212) 347 -7757.
28
Electronic Buyers Club
Electronic Specialists
16
PAGE no.
Natl.' Technical Schools
NEC America
Netronics, R & D Ltd.
NRI Schools
42
16 -19
Discwasher
26
33
34
13
Digi-Key Corp.
Dilithium Press
11
1
86
100
121 -125
Classified Advertising
Cincinnati Microwave
Cleveland Institute of
Electronics, Inc
Communications Electronics
CompuServe
9
31
103
Chaney
1
90 -93
96
Cover 2,
C & D Electronics
8
ADVERTISER
RS no
32
47
99
MISCELLANEOUS
MPG INCREASED! Bypass Pollution Devices easily. REVERSIBLY!! Free details- Posco GEE4, LaGrangeville, NY
12540.
VACUUM CLEANERS "Discount Prices" New Rainbow
$349.95, Kirby, Filter Queen, Compact, Details: ABC Vacuum
Warehouse, 7021 Burnet-PE, Austin, Texas 78757.
AUTOMOBILE RETUNING FOR MAXIMIZED ECONOMY.
DETAILS FREE! Techneering, Box 1506DD, Princeton, NJ
08540.
YOUR Expand-Ad ° is more
outstanding on
a
BEN -
background like this! Call (212) 725 -3927 for
more information.
DAY
-
ADD ANOTHER DIMENSION to your REGULAR CLASSIFIED ad
all BOLD type like this! Call (212) 725 -3927 for
more information!
FULL LINE ALL PARTS & COMPUTER PRODUCTS
P.O. Box 4430C
Santa Clara, CA 95054
RCA Cosmac 1802 Super Elf Computer Kit $106.95
Will calls: 2322 Walsh Ave.
(408) 988 -1640
ELECTRONICS
Same day shipment. First line parts only. Factory tested. Guaranteed
money back. Quality IC's and other components at factory prices.
Phone orders only (800) 538 -8196
INTEGRATED CIRCUITS
PROM
MOS MEMORY
50
25
200,
25
2102.1
2102AL 4
25
,
1
35
25
45
210249.20
99
75
211,
'5
2114
2104A-4
21079
2112
1
2
1740
5
15
4
2'í4L450
47t6 700,
8 4' 16 200Rs
45
MM5280
50
5M532'
60
M005370
65
85
42009
40
45
P5101m
9 768
4, Do
1MM2016
HM6m0
5
50
7
95
8
25
2716,
1
65
2716 5 voll
5
8 2716 5 Volt 3900
17 50
2732
2758
7 49
495
3
5
7
99
90
224
2
50
217
50
50
87414
39 95
8748
8748 -8
8755A
3995
34 95
4995
2
100
N82523
N825123
9829126
95
9825129
4 75
5 94
9829737
9825137
0M8577
4
8223
2
50
70 40
9
R 95
'1 50
3 50
95
3 95
511
12 95
INTERFACE
0095
1295 8096
091
MICROPROCESSOR
1e 95
eo9e
°ÿséió
95 8113
s 65 8T20
BT23
Bi14
P175
8
6522
9530
16
28
40
111741 750
36
50
E60059
29
40
49
9ND500 507
1010503 510
70
1
95
95
50
3
95
4
i4
28
40
67
18
18111800
PIN
21
55
-7
6
00
85
2 50
4 95
3
50
8251
4
,5
8253
8
5
8255
4
75
6
75
6
pp
4
WIRE WRAP LEVEL 3
PIN
9S
t
00
7
59
8 50
8228
61
O
1
8757
8259
Was
1002E plan
1861P
CRYSTALS
MHz
15
1
2
BO
10
MHz
MHz
10 MHz
78 MHz
20 MOO
32768
8432
3 5795
1
595
We
5000
150 Mece pacts
p!0',
OS
Oí5
012
0085
2
2
1
95
3
95
40 5a, per mpe 05
.
90
00
7
MHz
MHO
1516 MHHz
z
7768 MHz
50608 MHz
5 185 MNÑ
5 .113 M z
II
507
CA CA
CC
CA
CA CC
CA CC
CC
CC CA
CC CA
CC CA
300
600
111311 He.
Microcomputer
clock, 2K RAM. ROM Breadboard space. Excellent for control. Bare Board
$28.50. Full Kit $99.00. Monitor $20.00. Power
Supply Kit $35.00. Tiny Basic $30.00
16 bit /O, 2 MHz
I
49
0
5 1
MAN4610
CA
40
MAN4640
CC
40
MAN1710
MAN4740
CA
CC
40
MAN6640
CC
MAN6710
MAN6740
CA
CC
t
40
1
56
60
'11
60
7.
6538 MHz
31818 MHz
50
20
95
95
95
95
95
95
95
95
95
OS WIRE WRAP TOOLS In Nock
Complele nne or AP Products m stock
KEYBOARDS
'6 My ASCII 40,00474
514 05
MO
0_
of uelosu
e
Plastic
Type-N-TaIA
4,1
Imo
to
DY
VotraL
.41T4N.,.IM.4pm
.ïd"mlmélü¿:mm
5159M4PH,.NV.
00 So_
579
81515 40
mutant
Tremendous Value
a tremendous value as it
combines video, digital displays, LED displays, and music, all on a single board for
$106.95. Its unique ability for single step
debugging, display of state and mode of
the computer and display of addressing as
an inexpensive option gives it an "easy to
use" capability not available anywhere at
the price.
The Super Elf is
Inexpensive Expansion
The Super Elf expansion capability is
virtually unlimited and you can do it inexpensively one step at a time. Expansion
includes cassette interface, additional
memory, color video, Basic, ASCII keyboard, printer, floppy, S -100 bus, RS232,
etc.
The Super Elf comes complete with power
supply and detailed 127 page instruction
manual which includes over 40 pages of
Free 14 Page Brochure
Send or call for a free brochure on all
details and pricing of the Super Elf and its
expansion. We will get it right out to you'
Rockwell AIM 65 Computer
Elf II Adapter Kit $24.95
6502 based single board with full ASCII keyboard
and 20 column thermal printer. 20 char. alphanumeric display ROM monitor :, fully expandable
$419.00. 4K version $449.00. 4K Assembler
$35.00. 8K Basic $65.00 FORTH $65.00
assembled. 25 PROM capacity $37.50
(with timer $69.50). 6 PROM capacity OSHA
UL version $78.50 (with timer $108.50).
Strong Software Support
$9.95
o
Multi -volt Computer Power Supply
8v 5 amp, *_18v .5 amp, 5v 1.5 amp. -5v
12v
5 amp, 12e .5 amp, -12v option. ±55,
are regulated. Basic Kit $35.95. Kit with chassis
and all hardware $51.95. Add $4.00 shipping.
60 Hz Crystal Time Base Kit $4.40
TERMS: $5.00 min. order U.S. Funds. Calif. residents add 6% tax.
$10.00 min. VISA and MasterCard accepted. $1.00 insurance optional.
%.
Shipping: Add 5 %; orders under $25.00
-10
120
software, including a series of lessons to
help get you started and a music program
and graphics target game. Many schools
and universities are using the Super Elf as
a course of study. OEM's use it for training
and R &D. A monthly newsletter, Questdata is devoted exclusively to software for
the Super Elf and there are many software
books available at low cost. You can do a
tremendous amount with the software
available and there is more coming every
day. Of course, you can do your own
programming which is fun and very
rewarding.
95
Convert TV set into a high quality monitor w
affecting usage. Comp. kit w/full instruc.
ZBO
1
500
97
500 2 01
Video Modulator Kit
Bd. Only
90
1520 Clare. oólmlpceos
Modem Kit $60.00
$17.00. Article in June Radio Electronics.
00
1
500
State of the art, orig., answer. No tuning necessary. 103 compatible 300 baud. Inexpensive
acoustic coupler plans included.
1,
1
'0 dm94 display
15 432 MH¿
-4116 RAM 200ns
1
357
RS232C
8
'1
300
300
100
90
010005MM
fi
9
ì95
5
13 95
17 95
100 per type
1090 per type
MO,
1
RESISTORS 0. m. 1 5%
5
D3707017070
DI '27 728
20
8724
20
30
20
95
75
24
18
o
802Cf
14
16
90
65
75
75
40
95
74
01104
30
9 50
95
1' 85
II
80805
80850
MANI,
22
14
14
6552
5551
6801
5802
6820
6850
DISPLAY LEOS
SOCKETS
13
'5
8
2
65
65
IC
Solder Tin LEM MOM
PM
1UP PIN lUP
9 50
075
575
69
Linear CMOS and 7400
complete lines in stock.
Send for catalog.
65024
280A
8212
8214
8216
1000
2
735
19
17
2708
25324
1
2
300,
95
85
MICROPROCESSOR
6502
O95
The Ouest Super Elf is the right choice for
the person who has a need to learn more
about computers, from an understanding
of the hardware and how it goes together
to beginning programming with machine
language on up through basic.
Prices
subject
to change
CIRCLE NO. 41 ON FREE INFORMATION CARD
PROM Eraser
for your copy of our NEW 1982
OUEST CATALOG. Include 88p stamp.
FREE: Send
POPULAR ELECTRONICS
RATE: Ads are 2" by 3 ". insertion: $550.00. 6 insertions: $525.00 ea. 12 insertions, $500.00 ea. Closing
date: 1st of the 2nd mo. preceding cover date. Send order and remittance to Computer Mart, POPULAR ELECTRONICS,
Park Ave., N.Y., N.Y. 10016. Direct inquiries to (212) 725 -3485.
1
Computer Mart
1
ON -LINE DATABASE
1111Aut- horized
Deaí
UNIPROM
w+Yter
The ON -LINE DATABASE is designed for high speed retrieval of
large numbers of records. Using a machine language binary search
and retrieve routing, it will locate any record within a maximum o13
seconds, with 1000 records on file.
Using an assumed field option, redundant data for each record only
has to be entered once.
flexible report writer allows you to customize your printout.
addition, two built -in mailing label formats are provided.
A
In
Other features include:
user defined sort & retrieval keys
full screen cursor control during entry &
editing of data
print or display option at all times
fully menu driven
The ON -LINE DATABASE is standard DOS 3.3, may be copied for
backup purposes and is listable. No programming knowledge is required, and a tutorial with sample data is included.
Utilities available include:
file merging
arithmetic operations
flexible mail label formats
THE VERSATILE EPROM HANDLING SYSTEM
Reads /programs 2704, 2708, 2758, 2508, 2516,
2716 (1 supply), 2532 (T. I. pinout) and Intel /NEC
8755A with no personality modules required! All
power is derived from the S -100 bus, all signals are
S -100 compatible. Port mapping occupies NO
memory space!
The UNIPROM software is 8080/Z80 compatible
(2 or 4 mhz.) and includes a "menu" command, "intelligent" EPROM read/write and disk IA commands, and functions usually found only in
"monitors" and "debuggers."
Software is both on standard diskette formats
or on a "bootstrappable" EPROM. Software is
CDOS and CPIM compatible.
UNIPROM board (A & T) with documentation, including source listings
$199.00.
UNIPROM disk -based software with source and
listing (specify 5.25" or 8" CDOS or
-
-
CP /M, or NORTHSTAR 5.25" CP/M)
$38.00.
-
UNIPROM EPROM -based software with source
and bootstrap listing
$55.00.
Price: $100.00
CER -TEK, INC.
6020 Doniphan Dr. El Paso, Texas 79932
(915) 581.6697
.
BLUE LAKES COMPUTING
CDOS is a registered trademark of CROMECO, INC
CPIM is a registered trademark of DIGITAL RESEARCH,
INC.
NORTHSTAR is a registered trademark of NORTHSTAR
3240 University Avenue
Madison, WI 53705
(608) 233-6502
AP101
AP102
AP103
AP104
AP105
R5201
RS202
RS204
R5205
AT301
P401
P402
P403
Apple It with Single Disk Drive
Apple II with Double Disk Drives
Apple II, 9 inch Monitor 8 Double Drives
Apple ///, two additional Drives & Silentype
12 inch monitor plus accessories
TRS -80 Model I, Expansion Unit 8 Drives
TRS -80 Monitor or TV set
TRS -80 Model III
Radio Shack Color Computer
Atari Computer 8 Accessories
'
Paper Tiger 440 445 460
Centronics 730 737 Line Printer
Epson MX70 or MX80
Epson Mx100
Matching Attache Case
P404
CC90
5650 INDIAN MOUND
MOUND CT COLUMBUS
CIRCLE NO. 126 ON FREE INFORMATION CARD
-
DIFFERENT
SOFTWARE
PROGRAMS
IN STOCK
for ATARI
TRS -80
APPLE PET
HEWLETT PACKARD
and others
for brochure write or call
COMPUTER
CENTER
DigiByte Systems Corp
31 East 31st Street
480 Lexington Avenue
(between
(American Brands Bldg..
Madison & Park Ave.) between 46th & 47th St.)
New York, N.Y.
New York, N.Y.
21 West Street
New York, N.V.
in N.Y. Call (212) 889-8130
Outside N.Y. Call Toll Free (800) 221 -3144
CIRCLE NO. 128 ON FREE INFORMATION CARD
$150.00 buys a 4MHz Z80A with
64KB & a real Front Panel
$200.00 buys a Full Function
24x80 CRT with Keyboard
DIGATEK CORPORATION
Suite 7
2723 West Butler Drive
Phoenix AZ 85021
ROLL-YOUR -OWN TECHNOLOGY
AND SAVE A BUNDLE
Color Computer 4K
$839
$310
Model Ill 48K
disc & RS232C
APRIL 1982
c
un
nu coce ruerlouATrnu rAön
products for
Color Pac Attack
Monitor
Assemblers
Teat Editors
PASCAL Magikube
Finance Programs Color
Data Organizer Graphic Games Disassembler
Color Invaders
Adventure Games
/16K Ext. Basic
2
w
$2100
$459
HARDWARE
32
K
Cables
are'ust a few of our great
offers which include Printers, Modems, Computers, Peripherals, Disc Drives, Software and
mere.
call TOLL FREE 1.800-343 -8124
RAM Expansion Board
16 K RAM Set
Interlaces Power Pack ROM Cartridge
Printers
BUY DIRECT. These
We have the lowest
CCPirl uS
possible fully
Write tor your
warranteed prices
free catalog.
and a full complement
245A Great
d
of Radio Shack Software.
Littleton, MA 01440
ACCESSORIES
Books
Cassettes
<"
Supplies
Service Manual=
Shipping train stock
6bJ452e..ia1,5
Call or Wriln
COMPUTERWARE
.'141436-;5t2
Encinitas .GA9202:
or
Computerware ,s a rrademara or Corro
617.486.3193
CIRCLE NO. 129 ON FREE INFORMATION CARD
co`tße C
Q
`1`'
GG`t
to
o ,00
CIRCLE NO 130 ON FREE INFORMATION CARD
NEC:
e
edß
°
COMMODOR VIC.
Pt
APPLE, ALTOS, HP
8.
$CALL
XEROX
RCA VP-3501 Videotex
Data Terminal
$345.00
Terminala
Adds, Hazeltine, Televideo
With the
TU
-300, a radio receiver
and RTTY software for your
computer, you can receive and
transmit radio teletype. The TU -300
interfaces with RS-232 and TTL -type
110's, 170 Hz standard, 425hzI850hz
optional
Fully assembled or easy -to-build kit.
® Flesher Corporation
Call or write
507 Jackson PO Bon 976
Topeka konso566601
913 234.0198
rtorr
O_ TERWARE
SOFTWARE
Model III 16K
be running Fortran, Basic, Pascal, etc.
If you get our
TODAY
-94B4
COMPUTER
LIZEMANZI
You can have your own computer and
FREE BROCHURE
1U
.15650
CVL®Z1
SAVE 90%
YES you can save up to 90% on a
computer system of your own.
OHIO 43213
CIRCLE NO. 127 ON FREE INFORMATION CARO
You can pay more
But you can't get more!
OVER 2,000
II IV
119
129
139
99
109
84
129
89
109
99
89
89
99
75
computer case company
COMPUTER INC
CIRCLE NO. 125 ON FREE INFORMATION CARD
5109
rug, c
un
Telex 437126
111 nM cGCC IMCROMATMI
rOra
Calculators
H P
&
Sharp
Video Recorders
Mitsubishi (MGA), RCA
Scotch
&
Sony
Data Diskettes & VCR Tapes
Mail Order: FUTRA COMPANY
P.O. Box 4380 -P, Torrance, CA 90510
(213) 328 -8951
Retail: OMC
(800) 421 -5006
20695 S. Western Ave #124,
Torrance, CA 905 01
TWX 910 349 -6211 AGENFTRA TRNC
CIRCLE NO. 133 ON FREE INFORMATION CARD
121
CROSS ASSEMBLERS
following microprocessors:
6800 6801 6805 6809 68000 8080 /85 6502 1802
Manufacturer's complete instruction set
also feature macros,
"INDUSTRIAL"
"HOBBYIST"
MACROASSEMBLERS
ASSEMBLERS
48K Board
(400)
$400.00
350.00
500.00
$200.00
150.00
250.00
32K Board
18001
$299
$150
Pik
PERIPHERALS
CORP
from stock.
SPECIAL ON PREPAID ORDERS: Same -day EXPRESS MAIL
program will arrive
shipping, for no extra charge. Call today
-your
San Bernardino, CA
IDM
Anoka, MN 55303
(612) 427.0787 8:00
-
ATARI, 400, 900
NEW for
the '89 from
MAGNOLIA
MICROSYSTEMS
DOUBLE DENSITY
DISK CONTROLLER
only
51/4" &
rinrl
8" drives
$595 complete
MAGNOLIA MICROSYSTEMS, INC
2264 - 15th Ave W. Seattle 98119
(206) 285-7266
(800) 426 -2841
,
CP/M is a trademark of Digital Research.
CIRCLE NO. 137 ON FREE INFORMATION CARD
F
ilS
ran
PARTS, SUPPLIES &
FnFF INFnRMaTInN Caen
1
MICROPROCESSORS
8/14.00
8/16.00
8/18.00
Z -80A
550
-CPU
80804
8085A
25
7.00
2
Funds only California Residents add 6% Sales Tax.
CIRCLE NO. 136 ON
PEE INFORMATION CA
Hewlett- Packard
& TRS -801M Computers
Save on
Item
Qty 10
Qty 50
MD-5
$25.00
$110.00
c-10
$
C-20
C
6
C-90
7.50
9.00
11.50
15.00
$
32.50
39.00
50.00
70.(X)
For the best deals on Hewlett Packard HP -85,
HP-125 and Radio Shack° TRS80 Computers,
CALL OR WRITE US:
Pan American
UPS SHIPPING INCLUDED
in Continental USA
CA Customzrs add taxes
MICROSETTE
475 Ellis St., Mt. View,
(415) 968 -1604
CA 94043
{AMAX
raV- IJO
PC -8000
Electronics
1117 Conway Mission, TX 78572
Telex Number 767339
Toll Free Order Number 8001531.7488
Texas & Principal Number 512/581 -2766
TM
Trademark of Tandy Corporation
Dept. 64
-
CIRCLE NO. 139 ON FREE INFORMATION CARD
V1 rrTCC rnr
CONVERT ANY TV
NEC
ROM's
COMPLETE LINE OF ELECTRONIC
7812
7815
7905
7912
7915
6.50
6.00
12.00
12.00
Error -Free 51/4 -inch Diskettes (MD5) single- sided, soft sector, single or
double density, reinforced hub.
MICROPROCESSOR IC's
EPROM's
MICROPROCESSOR SUPPORT IC's
n
4.60
.75
.75
.75
.85
.85
85
SHIPPING: Add $2.00 for Ground $5 00 for Air.
ALL MAJOR MANUFACTURERS
ALL PARTS 1009b GUARANTEED
DISKETTES
CASSETTES
including CP/MTN2.2
RAM's
U.S.
Trademark, or ATARI. Inc
12 Noon
CIPCLE NO 134 ON FREE INFORMATION CARD
for both
are
7805
TERMS: Check, Visa, Mastercard. Call for C.o.D.
(714) 864 -5269
INTELLIGENT DEVICES OF MINNESOTA
P.O. Box 492
2.60
RAMS
4116(200ns)
4116(150ns)
21 14(200ns)
3389 Del. Rosa Avenue
92404
tomorrow!
REGULATORS
EPROMS
2708
2716
2716.1(350ns)
TMS 2716
2732
2532
INTEC
Prices include source code on tape and in printed form, User's Manual, shipping (USA), and program support. All programs shipped
1
Or
Reduces power consumption
Reduces heat
conditional
assembly, relocatable object code
6809 or 6502
Other 8-bit
16-bit
WHY PAY MORE? SAVE MONEY!
LOWEST PRICES ON PARTS!
Increases memory capacity
Written in 1966 ANSI standard FORTRAN IV
(Target
90045
(2131641-3101 (800) 421
48K RAM BOARD FOR THE 400
Long error messages, free- format input
INC.,
Los Angeles,
For ATARI
Two-pass assembly. w/forward references
Maehlne(s))
LostesA
CA 90045
RAM
WRITTEN IN FORTRAN IV
NOW AVAILABLE: two dltterent cross -assemblers for each of the
"Industriar Macroassemblers
LEO ELECTRONICS,
#208
TO A HIGH
QUALITY MONITOR
Series
Microcomputer System.
Japan's Most Popular Personal Computer
TECHNICAL BOOKS
Write for Special Discount
WRITE FOR
FREE
CATALOG
P.O. BOX 1957P
HAWTHORNE,
CA 90250
__
v-
w
'
12621 CRENSHAW BOULEVARD
HAWTHORNE CALIFORNIA 90250
CIRCLE
122
°^ ^ ^" eeee
$169
JC -1202 RGB Color Monitor
$899
Kit permits Dual Mode open
arion on B &W or Color sets
Hi- resolution
Up to 80
Dot Matrix Printer
$625
characters per line
1
800- 421 5775
ATlfW reran
12121
ACVM
Direct
Safe -Easy Installation
Send for complete Audio /Video equipment catalog.
V.A. \I.P. Inc
Box 411, Los Angeles, CA 90028
SYNAPSE VIDEO
P.O. BOX 962
Video
95
Wide bandwidth
A full line of low cost Monitors and Receiver /Moni'
tors available.
Payment by check or money order
Prices subject to change
SUNTRONICS CO., /NC.
1113 644 -1149
JB -1201 Green Phosphor Monitor
PC-8023
or In Icate on In o card
Prices
New York N
Y.
12131
10009
4665533
860 5776
wraenr e
'
un
1
At
naa CRC
1
fln
CA
CHICLE NO.
(420N
FREE INFORMATION CARD
POPULAR ELECTRONICS
Electronics Classified
CLASSIFIED RATES: Per Word, 15 Word Minimum. COMMERCIAL: $3.50. EXPAND-AO $5.25. Ads set in all bold type (a 20% premium. Ads set with background
screen @ 25% premium. DISPLAY: 1" x 21/4', $425.00. 2" x 21/4", $850.00. 3" x 21/4', $1,275.00. GENERAL INFORMATION: Frequency rates and prepayment discounts available. Payment must accompany order except credit card
Am. Ex., Diners, MC, VISA (include exp. date)
or accredited ad agency insertions. Copy
subject to publisher's approval; must be typewritten or printed. First word set in caps. Advertisers using P.O. Boxes MUST supply permanent address and telephone
number. Orders not acknowledged. They will appear in next available issue after receipt. Closing date: 1st of the 2nd month preceding cover date (e.g., Mar. issue
closes Jan. 1). Send order & remittance to: Classified Advertising, Popular Electronics Magazine, 1 Park Avenue, New York, NY 10016. Direct inquiries to Rose Lynch,
-
-
(212) 725 -7686.
TEST EQUIPMENT, new and used. Catalog $1.00. PTI, Box
8756; White Bear Lake, MN 55110.
FOR SALE
FREE DISCOUNT ELECTRONICS CATALOG. Over 41 million satisfied customers. Low, low prices on I.C.'s LED readouts, computer peripherals, audio components, solar products and much, much more. Poly Paks, Box 942 PEC, Lynn field, Mass. 01940.
GOVERNMENT and industrial surplus receivers, transmitters,
snooperscopes, electronic parts, Picture Catalog 25 cents.
Meshna, Nahant, Mass. 01908.
ELECTRONIC PARTS, semiconductors, kits. FREE FLYER.
Large catalog $1.00 deposit. BIGELOW ELECTRONICS,
Bluffton, Ohio 45817.
-49
RADIO -TN. Tubes
cents each. Send for free catalog.
Cornell, 4213 University, San Diego, Calif. 92105.
SAVE UP TO 50% on name brand test equipment. Free catalog and price list. Salen Electronics, Box 82, Skokie, IL 60077.
TELETYPE EQUIPMENT: Copy Military, Press, Weather,
Amateur, Commercial Transmissions. Catalog $1.00.
WEATHER-MAP RECORDERS: Copy Satellite Photographs,
National -Local Weather Maps. Learn How! $1.00. Atlantic
Sales, 3730 Nautilus Ave., Brooklyn, NY 11224. Phone: (212)
372 -0349.
BUILD AND SAVE. TV EARTH STATION. DETECTIVE
ELECTRONICS. Video Recorders, Color Cameras, advanced
Telephone Projects. BROADCAST Electronics. 50 page color
catalog of unusual electronic projects AIR MAILED $3.00;
with 3 hour audio cassette dramatization of our catalog $5.00.
Don Britton Enterprises, PO Drawer G, Waikiki, Hawaii
96815.
POLICE/FIRE SCANNERS, crystals, antennas, CBs, Radar
Detectors. HPR, Box 19224, Denver, CO 80219.
PRINTED CIRCUIT supplies, chemicals, tools, artwork, plating solutions. Major credit cards. Catalog $2.00, refundable.
CIRCOLEX, Box 198, Marcy, NY 13403.
RECONDITIONED TEST EQUIPMENT $1.00 for catalog.
WALTER'S TEST EQUIPMENT, 2697 Nickel, San Pablo, CA
94806, (415) 758 -1050.
NEW ELECTRONIC PARTS. Continuously stocked. Stamp
brings catalog. Daytapro Electronics, 3029 N. Wilshire Ln., Arlington Hts., IL 60014.
ELECTRONIC CATALOG. Over 4,500 items. Parts, 8 components. Everything needed by the hobbyist or technician. $2.00
postage & handling (United States Only), refundable with
first $15.00 order. T & M Electronics, 472 East Main St.,
Patchogue, NY 11772. (516) 289 -2520.
PRINTED CIRCUIT BOARDS, your artwork. Quick delivery.
Reasonable. Atlas Circuits, Box 892, Lincolnton, NC 28092.
(704) 735 -3943.
Satellite TV
FOR THE HOME
Sick of Network TV?
-
Our receiver lets you get
over 75 channels of television directly from earth orbiting cable TV satellites!: HBO, Showtime, super stations, sports and
movies worldwide.
,.-. --L
We don't just
From offshore oil rigs.
data links to hotels
and backyard instalWe
lations, we wrote the'
book. Constantly updated, our 94 Paga
technical information book and catalog gives you all
the facts. Inexpensive dishes, feeds, telemetry software, kits and more. Recommended reading by NASA, The Office
of Consumer Affairs and quality cornpanies like Rockwell /Collins. Send
sell information!
Manufacture
Hardware!
$7 95
today!
CALL
24 -hrs. C.O.D. Hotline
(305) 339-7800
®
SPACECOAST
Records both sides of phone conversation.
Stops recorder when phone is hung up.
This device is not an answering service.
ROBOT KITS, PARTS, MATERIALS BOOKS. Send $3 for
subscription to catalog and newsletter. ROBOT MART, 19
West 34th St., New York, NY 10001.
SATELLITE TELEVISION ... HOWARD /COLEMAN boards
to build your own receiver. For more information write ...
ROBERT COLEMAN, Rt. 3, Box 58-APE, Travelers Rest,
S.C. 29690.
UHF GATED PULSE SUPPRESSED KIT $39.00. UHF
SINEWAVE SUPPRESSED KIT, $37.00. Both include parts,
manual, and etched board. Manual only $4.60. Catalog $2.00.
J &W Electronics, P.O. Box 61, Cumberland, RI 02864.
RF POWER TRANSISTOR - TUBE CATALOG FREE.
MRF453 /MRF455A/SK1451 - $14.00; MRF454 /SRF2072/
MRF2769
$17.00; MRF245/MRF247 - $27.00; 2N4048 $6.20; Exclusive Repair Center for PALOMAR PRIDE, etc.
Westrom, 1320 Grand, San Marcos, CA 92069. (714) 744-
-
0728.
-
IN preamp MICROWAVE DOWNCONVERTERS BUILT
highest gain. Downconverter board, plans - $15.00. Power
Supply Board, Plans - $5.00. Antenna Cookbook - $5.00. All
three for $20.00. MICRO ENGINEERING, P.O. Box 17231,
Minneapolis, MN 55417.
Precision 25" Parabolic Antenna
Prebuilt Converter and Preamp
Assembled Power Supply
Low -loss Coaxial Cables
One Year Warranty
Completely Built and Tested
sire lcu
Each
$19.95
DATA SERVICE CO.
StMe05
3110 Evelyn Street
Roseville. MN 55113
$ .oo sAigtimg
612-636-9469
Wireless Mic
10 times more powerful than other mils.
V. mile to any FM radio
Easy to assemble kit. 15V battery (rat incl.)
Call 1305) 725 -1000 or wad $19.95. $1.00
Buy
Transmits up to
shipping per
Item k USI Corp., P.O.tàox PE -7052. Meöo me,FL 32901.
COO'. accept. For catalog of trans mltters,voice scramblers
and other specialty items, enclose $2.00 to USI Corp.
CHEMICALS, Apparatus, Project Books, Wide Selection.
Catalog send $1.00 to Pioneer Corp., 14e Hughey Street,
Nashua, NH 03060.
APRIL 1982
FREE KIT CATALOG contains test equipment. Phone 415447 -3433. DAGE SCIENTIFIC INSTRUMENTS, Box 1054P,
Livermore, CA 94550.
AMATEUR MICROWAVE T.V. ANTENNAS. Receive uninterrupted movies, fully guaranteed. Also in kit form. For information and plans send $8.00 to: MDS Specialist, P.O. Box 67,
Southaven, MS 38671.
LOOKING FOR THE BEST BUYS in transistors, IC's, diodes.
Call 800 -458 -6053, in PA (814) 837 -6820. MCNISA honored.
Saving, service, quality, as only B &D can do. B & D Enterprises, P.O. Box 305, Kane, PA 16735.
SATELLITE T.V. Books, parts, low noise microwave transistors. Specs and catalog $2.00. Elite Electronics, RR1 St.
George, Ontario, Canada NOE1NO. U.S. Inquiries.
-
Surf $19.95, Wind $19.95,
SOUND SYNTHESIZER KITS
Wind Chimes $24.95, Musical Accessories, many more.
Catalog free. PAIA Electronics, Box J14359, Oklahoma City,
OK 73114.
RESISTORS, 1/4W, 1/2W5 %C.F. 36ea., 1% Metal films. NO
MINIMUMS. Quantity Discounts. Details from: JR INDUSTRIES, 5834-E, Swancreek, Toledo, OH 43614.
Amateur
MICROWAVE
MICROWAVE TV SYSTEM
Super Powerful
FREE CATALOG 99 cent kits. Parts. Bargains Galore! ALL KIT, 434 West 4th St., West Islip, New York 11795.
RESEARCH CORPORATION
SYSTEM 20
my Disc. ,Wail.
13830.
P.O. Box 442 -A, Altamonte Spgs, FL 32701
Telephone Listening Device
Record telephone conversations in your
office or home. Connects between any
cassette or tape recorder and your
telephone or telephone LINE. Starts
automatically when phone is answered.
SATELLITE TELEVISION INFORMATION $4. Build or buy
your Earth Station. Satellite Television, RD 3, Oxford, NY
Gov't
Surplus
SAV E
To
851.
Send 60C For Big Bargain Catalog
looae of eereelne; Surplus, rx.eee InrnTy.
prend Ne,
aquip,nnT
N
010.I111Oa1
Il YpeOWS
991Ca6
tllNn
WS IT9W 11OTUw9m
111, n,a4lN MAIMS
ISM
aWKl
SURPLUS CENTER
WYOCUUn
MC-ROOKS
TOOL
Rex $2259 -14
W!
SOSO
MUMS
Lincoln, Nebrosko
Zip Code 68501
Inc.
SMP
$35.00
PO. Box 1241
Vienna, VA 22180
Orders:
1-800-368-3028
Inquiries
-703- 255 -2918
and Virginia Call
VISA /MC
1
SCANNER ACCESSORIES, both kits and factory asscr.:bled.
Free catalog. Capri Electronics, Route 1 P, Canon, GA 30520.
HENLEY'S 20th CENTURY BOOK of 10,000 Recipes, Formulas & Process for almost everything used in the home,
farm, workshop or industry. Satisfaction Guaranteed. Send
$15.00 to: Nile Corp, 14a Hughey St., Nashua, NH 03060.
SUBSCRIPTION
TELEVISION SYSTEMS. SINEWAVE
SYSTEMS; 2300 MHZ MICROWAVE
VERTER. Best systems
DOWNCON-
available; no internal con-
nections to TV! Plans $10.00 each; both $15.00.
PARTS, KITS AVAILABLE; MCNISA accepted on parts
purchases. Send SASE for parts pricing and more
information on these and other unique plans.
COLLINS ELECTRONICS, Box 6424, San Bernadino,
CA 92412.
INTERCOM! -Your pushbutton telephones can double as an
intercom for under $20.00 in parts! Plans and instructions.
$5.00. dB Enterprises, Box 453, Westwood, NJ 07675.
BOOTLEGGERS BIBLE FOR CB MODIFICATIONS, $12.95.
CB Radio Repair Manual, $8.95, Linear Plan Book, $11.95.
Also Kits, complete units, and more. Catalog $1.00 at: A.P.
Systems, POB 263PE, Newport, RI 02840.
SATELLITE TV
FANTASTIC 80
aE
PAIS nAOm
PAW
Superior
Microwave Products.
2300 MHZ Downconverter Kit
SIPS 11O°OSS
AYTOM
TV
v
o°
CHANNELS
New antenna construction plans plus big 8 x11
book loaded with aiming info, kits, LNAs and receivers at wholesale prices. Far better than cable
N! Enjoy crystal clear reception. Send $9.95 today. Add $2.00 for 1st class (air mail) or call our
24 hr. COD order line (305)862.5068 Now.
Global TV Electronics, FO. Box 219 -E. Maitland, FL 32751
123
VARIETY ELECTRONIC SURPLUS parts and pieces. Monthly picture flyer. Send $2.00 for 6 issues. Star -Tronics, P.O.
Box 683, McMinnville, OR 97128.
ABEX,
P
MICROWAVE TV ANTENNA
$169 95
18" Dish Type Antenna. Probe Mounted
Down Converter. 6 Month Warranty
MICROWAVE TV MANUAL
$16 25
Plans and Concepts
SUBSCRIPTION TV MANUAL
S14 95
Theory. Schematics. Etc
KITS AVAILABLE
INFORMATION PACKAGE.
$2 00
Send Check or MO Add 5°-o Shipping CA
Residents Add Tax
0 Box 26601 -PE. San Francisco. CA 94126
WHOLESALE RADAR DETECTORS, POLICE/FIRE SCANNERS, CB accessories- Whistler 01000 $199.99; Q1000R
Remote $219.99; Fox Vixen $209.99; SuperFox Remote
$224.99; Bearcat 100 $295.99. Bearcat 300 $336.99; plus
Free catalogue-Scanner
VISA/MC/COD
$3.00 shipping
World, 10 -PE New Scotland, Albany, NY 12208 (518) 436-
-
-
9606.
ANTI -GRAVITY. Solid -state electronic levitation. No moving
parts, magnets, gases, exotic fuels. Data, schematics, diagrams. 105 pages, 8X10 mimeo. $20.00 ppd. GUARAN-
TEED! SAUCER TECHNOLOGY, Box 132 -M, Eureka
Springs, Arkansas 72632.
MICROWAVE RECEIVER SYSTEM
Wanted". Dept.
SATELLITE TV ANTENNA - We make the best 10 foot fiberglass dish in the Midwest!!! Receive 75 TV channels direct
from the satellite. We have openings for dealers. For complete specs and satellite TV information send $2.25 for postage & handling to: SPACE ANTENNAS, 127 W. 10th, KCMO,
64105.
PE,
-
Write: "Dealers
POB 4181, Scottsdale,
AZ
85258 (602)-941 -9395.
PCB 150 sq-in FREE DRILLING. SATISFACTION GUARANTEED. International Enterprise, 6452 Hazel Circle, Simi Valley, CA 93063.
FREE! 10 prime red LED's plus catalog. $2.00 value.
Please enclose $1.00 for postage and handling.
The Kit Option.
ETRONIX, Dept. 42, 14803 NE 40th, Redmond, WA 98052.
Powerful Tesla Cals from 50.000 volts t0 5 Megavolts
520 Watts l0 1000 Peas K,IOWalls These H, h Voltage. High
Frequency Lightning Generators produce Fors Lightning 6
mches tome, 10 feet Our 5 Plan Construction Manual Includes
How To Dea,gn Resonant Au -Core Tesla Cotta (Step- By.Stepl.
Elece,cal Schamsets d Theory. Ball L,gmning b llghlning
Production.25 AmaE,ng Experiments. Rus Much, Much More
5
ergo,, Tesla
CoilrererEu,EN
esta a 19M
B8 L SCIENTIFIC
Dept. CPE24, 735 N. Northlake Way
Seattle, Washington
98103
signals from air-
also available. Kits or assembled. MICROCRAFT,
Box 513R, Thiensville, WI 53092. (414) 241 -8144.
UNSCRAMBLE CODED MESSAGES from police, fire
and medical channels. Also telephone recording
adaptor. Same day service. Satisfaction guaranteed. Don Nobles Electronics, Inc. Rt. 7, Box 610 -A,
Hot Springs, AR 71901. (501) 623 -6027.
REVERBERATION FOR ORGANS AND KEYBOARDS -Simply connected to any electronic organ, even those with multiple output channels. Room size and reverberation time adjustable. Nothing comparable in this price range is offered on
the market. Send for free brochure. DEVTRONIX ORGANS
INC., Dept. 20, 6101 Warehouse Way, Sacramento, CA
95826.
for SATELLITE TELEVISION, MImonitors, cameras,
kits. FREE CATALOG. Phone (402) 987 -3771. DealRF MODULATORS
Be an
MAIKTENANCE
e CONTRACTOR
Make more money! Check out
Electrician's wages against the
kind of money you make now!
I
UCTIOp
TRAIN AT HOME IN SPARE TIME
Make extra money in spare time while you train for a fulltime job. Do odd jobs for friends and neighbors. Save
money doing your own electrical work. Learn everything
from repairs and maintenance to complete electrical installations. No previous experience needed. Everything explained in easy -to- understand language with plenty of
drawings, diagrams and photos. Tools, materials, test
equipment included with course. Approved for Veterans
and G.t: s. Be ready to take almost any electrician licensing examination offered by state, city or county.
No cost, no obligation, no salesman will call!
MAIL COUPON TODAY!
'C'Electrician School, Dept. PD032
sifief
ICS Center. Scranton, PA 18515
Rush free facts that tell haw can train at home
in spare time to be an electrician
I
NAME
ADDRESS
`IlY /STATE /ZIP
124
vnsRED
TUSTIN, CA 826110
MICROWAVE, OTHER TV EQUIPMENT. Catalog 200, manual $1. Trojan Enterprises, 2920 Shelby, Indianapolis, Indiana
46203.
-
LASER POWER SUPPLIES - Ne /He through 5 milliwatt
$125 ea. New with 90 -day guarantee. Specify laser manufacturer and model. M.T.I., 6929 North Ave., Lemon Grove,
CA 92045.
1
-
Carbide Drills, artwork
ETCHED -DRILLED Circuit Boards
materials. CM CIRCUITS, 22 Maple Avenue, Lackawanna,
NY 14218.
CHEMISTRY ELECTRONICS. Make Printed Circuits Yourselves. Printing methods, electroplating, in -hole plating etc.
30 pages, $3.00 ($5.00 by air). Please send to: A. Lin (M.Sc.),
P.O.B. 2762, Ramat -Gan, ISRAEL 52127. Agents needed.
*
APPLE OWNERS -CODE PRACTICE with built in speaker.
Make Tapes, Key transmitter. Uses screen for memory. Cassette $10, Disk $12.40 Postpaid USA. HART, 7720 Bogart, Ft.
Worth, TX 76118, (817) 498 -1899.
PLAY YOUR TAPES, records, T.V. on any F.M. radio in your
house - wireless - simple hook -up. Satisfaction guaranteed.
$24.95. Port-o -Sound Co., Box 279A, Howard Beach, NY
11414.
CALL US FIRST. For low Ham prices. All major brands. Call
TOLL FREE 6-10PM. Mon/Wed /Fri - 1 -800- 231 -3057. Madison Electronics, 1508 McKinney, Houston, TX 77010. (713)
658 -0268 Daytime.
C.B. EQUIPMENT
GET MORE CB CHANNELS AND RANGE! Frequency Expanders, boosters, speech processors, how -to-books, plans,
modifications. Catalog $2. CB CITY, Box 31500PE, Phoenix,
AZ 85046.
BOOTLEGGERS BIBLE FOR CB MODIFICATIONS. $12.95,
CB Radio Repair Manual, $8.95. Linear Plan Book, $11.95.
Also Kits, complete units and more. Catalog $1.00 at: A.P.
Systems. POB 263PE, Newport, RI 02840.
CABLE TV
30 CHANNEL
DANCING LIGHTS UNLIMITED*
(DANCING LIGHTS BRING BEAUTY TO MUSIC)
(BUILD YOUR OWN OR BUY READY-BUILT)
EXCELLENT FOR: COMMERCIAL OR HOME USE
(W i AGC A SEQUENCE SYSTEMS)
DESIGNS INCLUDE: SCHEMATICS, DRAWINGS, EASY-TO -GET
PARTS, UNUSUALLY SIMPLE, GREAT PRICE.
SEND TO: DL1 P.O. BOX 3432 QUINCY, IL 62305
8/12000W
16/20000W
8/6000W
CHANNEL 4/1500W
56.75
S8.75
$15.75
DESIGNS
S4.75
0475.00
$675.00
$1275.00
0275.00
BUILT
MICROWAVE MICROSTRIP TV DOWNCONVERTER
PLANS, INCLUDES 3 SPECIAL TRANSISTORS, $25.00.
Variable 2,000 mhz - 2,400 mhz. Newest design and built with
under 40 spare electronic parts. MIDWEST SEMICONDUCTOR PRODUCTS, 3832 West Lisbon, Milwaukee, WI 53208.
POWER SUPPLY PLANS AND I.C.'s $15.00. Build a dual
meter, 100 WATT, filtered DC, 0 -100V, variable voltage and
variable current limiting, 0 -1 amp, versatile supply from com-
ELECTRICIAN
coxsTA
COMPUTER EQUIPMENT. New/Used. For Sale through
COMPUTER SHOPPER Magazine. It's like belonging to a
buyers club. 6 months trial, only $6. COMPUTER SHOPPER,
Box F198, Titusville, FL 32780, 1 -800-327 -9920.
CABLE TV
CONVERTER
FREE!
ORDER No. 198ÁE047
ROUTE
9N,
PLATTSBURGH, N.V. 12901
Tel.: 1518) 561 -8700.
UNUSUAL
IC PARTS
3'
I ELECTRON
CA TALO
DE
8,
IAS
CCTV. Also
ers Welcomed. AN RESEARCH, 13 -P Broadway, Dakota City, NE 68731.
I
I
cOwUETELY
SUITE 105-47L
MICROWAVE TELEVISION "DOWNCONVERTERS." Highest Quality, Easily Assembled. Catalogue: $2.00 (refundable).
NDS, Box 12652-E, Dallas, Texas 75225.
waves with new CODE *STAR. LED readout or connect your computer /printer. Keyboard, other items
I
Palentdeur., the
aIFeow 2 9a ÁÑÁÑIfÉEIFeÑÓ!
-
CROCOMPUTERS
ATARI 80016K $750. EPSON MX 80 -FT, $640. Catalog Gen eralComputer, Box 2384, Auburn, AL 36830, (205) 749 -0044
(5- 11PM); (305) 371 -4046 (9 -5PM), VISA/MC.
RADIO AMATEUR CALLBOOKS: 1982 Directories of Radio
Amateurs around the world. U.S. Callbook $22.00; Foreign
Callbook $21.00, shipping included. See your dealer or write
for FREE catalog. Radio Amateur Callbook, Dept. PE, 925
Sherwood Dr., Lake Bluff, IL 60044.
CORDLESS TELEPHONES. Low prices, all major brands. In(206) 743-3977. TRINE quires or Visa/Mastercard orders
TICS, Box 6005, Lynwood, WA 98036.
DECODE Morse, RTTY, and ASCII
INTERACT OWNERS- New game programs for your computer! Write for free list to: S.E. Novotny, Jr., 643 Hayes St.,
Hazleton, PA 18201.
CREATE FANTASTIC FORK LIGHTNING DISPLAYS
Budd
215 WEST FIRST STREET
-s
SIMPLIFY digital testing with Octatrace. Converts any oscilloscope to display 8 channels of TTL signals. Board, case, manual- $25.00. AB COMPUTER PRODUCTS, P.O. Box 571,
Jackson, NJ 08527, (201) 370 -9889.
AMATEUR RADIO
TESLA COIL CONSTRUCTION PLANS
Our finished speakers are
recommended by Hi -Fi
reviewers everywhere but
some people want the savings
and satisfaction that comes
with building and finishing
their own. Hence our
kit option. Write us
for our free catalog
PERSONAL COMPUTER ABC'S. Simplified, must have reference manual for beginners. $2.00, FENCO -PE2, Box 309,
Bellevue, WA 98009.
mon spare pals. MIDWEST SEMICONDUCTOR PRODUCTS, 3232 W. Lisbon, Milwaukee, WI 53208.
PAY TV ENCODING /DECODING. Latest systems covered,
$8.95. G.A.M. Engineering, 706 Akron Blvd, Kent, OH 44240.
SAVE ELECTRIC SHOWER HEADS Reduce your electric
bills. Info -send $1.00 to: SERV -INTL, P.O. Box 331, Tampa,
FL 33601.
COMPUTER EQUIPMENT
SURPLUS COMPUTER PERIPHERALS: "Selectric" I/O
typewriter bargains. World's largest selection. Send 250 for
bargain -packed flyer. CFR, Box 144, Newton, NH 03858.
PLANS AND KITS
PRINTED CIRCUIT Boards from sketch or artwork.
Kit projects. Free details. DANOCINTHS Inc., Dept.
PE, Box 261, Westland, MI 48185.
LASERS HANDBOOK with burning, cutting, Ruby Reds, CO's
complete plans, books, and parts. Send $4.00 to: Famco,
Dept. PE, Box 1902, Rochester, NH 03867.
GIANT SCREEN TV projection system converts any television into 7 -foot picture. Lens & instructions $14.95. (Dealers
welcome). Bell Video, 4616 Belair Rd., Baltimore, MD 21206.
FM STEREO TRANSMITTER KIT. Range up to 1/3 mile,
broadcast quality, 30 db separation, 300 my audio input sensitivity. Tunes 88-108 Mhz, highly stable, 50 ohm out. Requires
+ -15V. Complete kit 89.95. Commercial quality AM TRANS-
MITTERS also available. Free info. STELLATRON, 4942
Whitsett-205, N. Hollywood, CA 91607. 213/506 -0415
PROFESSIONAL LIMITER -COMPRESSOR -EXPANDER
SAVE 90% Build Your own Minicomputer. Free Details. Digatek, 2723 West Butler Dr., Suite 200, Phoenix, AZ 85021.
KITS. Pro specs and features, balanced input, adjustable
threshold, slope (1:1 to 100:1). attack and release. Models
from $79 and up. Rack mounting available. Free Info. STELLATRON, 4942, Whitsett-205, N. Hollywood, CA 91607.
USED COMPUTER TERMINALS. Printers, Modom, Surplus
Electronic parts. Catalog $1.00. RONDURE COMPANY, THE
COMPUTER ROOM, 2522 Butler St., Dallas, TX 75235. (214)
630-4621.
PEAK EXPANDER AND CX DECODER KIT MODEL SX-80
$76.00 plus $2.00 Shipping. Complete plans $1.00. See
Radio Electronics Dec. 81. Sound Concepts, Box 135P,
Brookline, MA 02148.
POPULAR ELECTRONICS
MINI FM MIC
ompact size only 2 -x1'x . Transmit
lo FM radio 88 108 MHz ' Exceptional
audio qual ty Transmits stable signal up
to 90011 Complete kit Intl case battery
8 instructions Only $13 95 Assembled
$18 95 Add $1 55 S8H ea Send 18e
stamp for
S.E. Corp., Box 16969-P
Temple Terrace, Fl 33687
UNIQUE TV CIRCUIT plugs between UHF and VHF tuners on
tube or solid state sets. Plans $3.95. Drilled etched printed circuit boards $23.00. HELICO ANTENNA receives multi polarized signals. Plans $3.95. Antenna Kit $19.95. Information
$2.00. HELICO, P.O. Box 304, Bridgewater, MA 02324.
PRINTED CIRCUIT KIT. Photo sensitized glass epoxy,
chemicals and artwork supplies included. $31.90. Will produce your boards complete. Send artwork for quotation. KELONIC, 33568 Otto, Fraser, MI 48026.
SATELLITE RECEIVER KITS, Satellite Receiver Construction Manual (with focus on cost/performance) Construction
Manual: instructions include receiver, Lna, Parabolic Ant. plus
aiming. Circuit Boards, manual $95.00, Manual only $10.00.
NTE, P.O. Box 23441, Richfield, MN 55423.
LIGHTNING BULB PLANS. Create Branch Lightning - Aurora
Phenomenon Inside Clear Lightbulbs! Unique Construction
Plans include: Schematics, Theory, Experiments ... Plans
$10. Catalog $1.00. B &L SCIENTIFIC, 215 W. First St., Suite
105 -47P, Tustin, CA 22680.
TELEVISION to oscilloscope conversion. No modifications to
TV. Plans and PC board $8.50. MICROGRID, Box 613B, Ithaca, NY 14850.
FREE CATALOGS. Repair air conditioning, refrigeration.
Tools, supplies, full instructions. Doolin, 2016 Canton, Dallas,
Texas 75201.
GOVERNMENT SURPLUS
GOVERNMENT SURPLUS! Millions of items (including
Jeeps) ... low as le on dollar! Most complete Directory available, $2.00. DISPOSAL, Box 19107 -HD, Washington, DC
20036.
JEEPS, CARS FROM $35.00
- 700,000 ITEMS! - Government Surplus - MOST COMPREHENSIVE DIRECTORY
AVAILABLE tells how, where to buy - your area - $3 - MONEY
BACK GUARANTEE - "SURPLUS INFORMATION SERVICES," Box 3070GE48, Santa Barbara, California 93105.
PERSONALS
MAKE FRIENDS WORLDWIDE through international correspondence, illustrated brochure free. Hermes -Verlag, Box
110660/Z, D -1000 Berlin 11, W. Germany.
T.V. MEN - Hi- PROFITS - ONE MAN FACTORY. Rebuild
CRTs for $3.00. Purchase Patented equipment. Original manufacturers. New /used. Free training. C.R.T., 4071 Elston, Chicago 60618. (312) 583 -6565.
CORRESPONDENCE FOR FRIENDSHIP IN PHILIPPINES,
MALAYSIA. Free information. AACC -(PE), Box 1542, Canoga
Park, Calif. 91304.
BORROW $30,000 without interest! All eligible. Repay anytime. Free details. Infohouse, Box 1004-PE4, New York, NY
PENFRIENDS
ENGLAND
USA, through correspondence. Send age, interests. Free reply. Harmony, Box 89PE,
Brooklyn, New York, 11235.
BORROW BY MAIL! $500.00 - $50,000.00. No collateral, bad
credit no problem!!! Write: Gelco Financial Services, Box
CORRESPONDENCE for friendship! Mexico, Philippines, Europe, USA. Free information. International, Box 1716 -EL,
Chula Vista, CA 92012.
BORROW $25,000 "OVERNIGHT." Any purpose. Keep indefinitely! Free Report! Success Research, Box 29070 -GD,
Indianapolis, IN 46229.
UNATTACHED Meet friendly interesting single people nationwide. Free details. THE ARTS WORLD, Box 833, Amityville, NY 11701.
33622.
-
-
UNIVERSITY DEGREES BY MAIL! Bachelors, Masters,
... Free revealing details, Counseling, Box 317 -EP4,
Tustin, California 92680.
$2.50. DL5, P.O. Box 3432, Quincy, Illinois 62305.
CUSTOM TV SCHEDULES for HBO or Showtime or The
Movie Channel, $15.00 /yr. or send for free sample to: P.O.
Box 947, Gresham, OR 97030-0192.
BEAUTIFUL PULSATING ELECTRONIC Star. Plans $6. Z.
Electronics, P.O. Box 224, Manning, Iowa 51455.
ALARMS
Burglar Fire Protection
T1ßE
,xR1ÿ
cxlitai A
Protect Your Life, Home, Business, Auto, etc.
Our catalog shows how. Install your own
alarm systems and devices and save SEES. We
offer FREE write -in engineering service.
FREE
INSTRUCTION
Bachelors, Masters, Ph.D.'s. Free revealing details. Counseling,
Box 317 -PE04, Tustin, California 92680.
UNIVERSITY DEGREES BY MAIL!
LEARN WHILE ASLEEP! HYPNOTIZE! Astonishing details,
strange catalog free! Autosuggestion, Box 24-ZD, Olympia,
Washington 98507.
LEARN ELECTRONIC ORGAN SERVICING at home, Completely revised course covers latest models including digital,
LSI's, synthesizers, etc. NILES BRYANT SCHOOL, PO Box
20153, Sacramento, CA 95820.
CATALOG
Burdex Security Co.
Box 82802- PE
10003.
34293 -PE, Indpls., IN 46234.
BUMPER STICKER PRINTING DEVICE. Cheap, Simple,
Portable. Free details, Bumper, POB 22791 (PE), Tampa, FL
$10,000 IN THREE MONTHS. Guaranteed NEW real
estate method. Nothing down. Absolutely no investment required. Good credit unnecessary. Anyone,
any age will succeed. Use someone else's money
... FREE! Proven and tested. Iron clad, unconditional money back guarantee. Send $9.95 today to:
Real Estate Institute, Box 3361 -A, Santa Clara,
California 95055.
EMPLOYMENT OPPORTUNITIES
JOBS OVERSEAS - Big money fast. $20,000 to $50,000 plus
per year. Call 716 -842 -6000, ext. 320.
ELECTRONICS /AVIONICS EMPLOYMENT OPPORTUNITIES. Report on jobs now open. Details FREE. Aviation Employment Information Service, Box 240E, Northport, New
York 11768.
NATIONWIDE listings of major companies employing Engineers and Technicians. Free Details! AVI, Box 264 -PE4, Buffalo, NY 14215.
Lincoln, Ne. 68501
Earn up to $600
BURGLAR, FIRE, CAR! Finest equipment! Save! Free Catalog. AAS, 186A Oxmoor Road, Wham, AL 35209.
PROFESSIONAL BURGLAR ALARM Annunciator. Build for
$10., Plans $3. R GARRETT, 399 College St., Winchester,
KY 40391.
HIGH FIDELITY
TOP QUALITY SPEAKERS AND KITS. Send $2.00. Speaker
Warehouse, 801 North Route 441, Hollywood, FL 33021.
DIAMOND NEEDLES and STEREO CARTRIDGES at DISCOUNT PRICES for SHURE, PICKERING, STANTON, EMPIRE, GRADO, AUDIO TECHNICA, ORTOFON, ACUTEX
and ADC. Write for free catalog. LYLE CARTRIDGES. Dept.
S., Box 69, Brooklyn, NY 11218. For fast COD service Toll
Free 800-221 -0906. 9AM - 8PM except Sunday.
WANTED
GOLD, Silver, Platinum, Mercury, Tantalum wanted. Highest
prices paid by refinery. Ores assayed. Free circular. Mercury
Terminal, Box 191, Norwood, MA 02062.
TUBES
a Week & Morel
No costly school
The Original FCC Tests.
Answers exam manual that prepares you at
home for FCC General Radiotelephone License.
-
Newly revised multiple- choice exams cover all
areas tested on the actual FCC Govt exam!
No previous experience required. 512.95 postpaid. M eybaek Guarantee.
Dept.
P.O. Box
ARABIA- OVERSEAS! Vital Employment Guide. 60
Companies. $15: AJK -PE, Box 32378, Washington, DC
SAUDI
CtlYiil4nD
PRODUCTIONS
B.
TUBES: "Oldies ", Latest. Supplies, components, schematics.
Catalog Free (stamp appreciated). Steinmetz, 7519 -PE Maplewood, Hammond, Ind. 46324.
20007.
26348, San Francisco, CA 94126
MEDICAL ELECTRONICS TECHNOLOGY, home study.
Troubleshoot medical instruments. WTI, P.O. Box 124, Pine -
REAL ESTATE
dale, CA 93650.
FREE CATALOG! Top real estate values coast to coast!
Please specify types, property and location desired. UNITED
FARM AGENCY, 612 -EP West 47th, Kansas City, MO 64112.
COLLEGE DEGREES BY SPECIAL EVALUATION of EXISTING Credentials & Job Experience. Fast, Inexpensive, (614)
863 -1791. Guidance, Box 13151 -A4, Columbus, Ohio 43213.
YOUR OWN RADIO STATION! AM, FM, cable, licensed, unlicensed, low cost transmitters! Free information. Broadcasting, Box 130-A4, Paradise, CA 95969.
PATENT AND DEVELOP your invention. Registered Patent
Agent and Licensed Professional Engineer, Send for FREE
PATENT INFORMATION every inventor should have. Richard L. Miller, P.E., 3612 -E Woolworth Building, New York, NY
10007. (212) 267 -5252.
FREE CONSULTATION
Disclosure registration
BOOKS AND MAGAZINES
SUBSCRIPTION TELEVISION EDUCATION MANUAL.
Complete theory in circuits $9.95. D & S Enterprises, P.O.
Box 110901 PE, Nashville, Tennessee 37211.
FOR INVENTORS
INVENTIONS WANTED
-49
RADIO & T.V. Tubes
cents each. Send for free Catalog.
Cornell, 4213 University, San Diego, Calif. 92105.
NO
IDEA TOO SMALL
RUBBER STAMPS
RUBBER STAMPS, BUSINESS CARDS. Many new products. Catalog. Jackson's, E -100, Brownsville Rd., Mt. Vernon,
Ill. 62864.
REPAIRS & SERVICES
Potential cash or royalties from manufacturers seeking new
ideas For free information on how to register your ideas. Call or wets.
AMERICAN INVENTORS CORP.
59 Interstate Dr. Dept PE
West Springfield. MA 01089 (4131 737 -5376
A Fee Based sema Company
TUBES -RECEIVING, Industrial and Semiconductors Factory
Boxed. Free price sheet including TV, Radio and audio parts
list. Transleteronic, Inc., 1365 39th St., Brooklyn, New York
11218. Telephone: (212) 633-2800. Toll free: 800- 221 -5802.
BUSINESS OPPORTUNITIES
HUGE INVENTORY! Thousands of types. Wholesale prices.
FREE CATALOG! ETCO Electronics, DEPT. 290, Plattsburgh, NY 12901.
ERASE DEBTS with little-known law- create wealth!! Details
FREE
Blueprints, No. EE4, LaGrangeville, NY 12540.
APRIL 1982
FREE BOOK "2042 Unique Proven Enterprises." Fabulous
"unknowns," second inflation income. Haylings -M. Carlsbad,
CA 92008.
MAILORDER OPPORTUNITY! Start profitable home business without experience or capital. Write for free book, case
histories, plus complete details. No obligation. Maii Order Associates, Dept 461, Montvale, NJ 07645.
Ph.D's
AUDIO AMPLIFIER SCHEMATICS, 10 different designs
-
MECHANICALLY INCLINED individuals desiring ownership
of Small Electronics Manufacturing Business
without investment. Write: BUSINESSES, 92-K4 Brighton 11th, Brooklyn, New York 11235.
D&A EQUIPMENT REPAIRED: Virginia Sabala, D&A's head
technician 15 years, is now operating a parts and repair service. Communications Unlimited, 1217 Ave C, Scottsbluff, NE
69361. Phone: (308) 635 -7365.
RECORDS & TAPES
-
OLD TIME RADIO PROGRAMS on cassette tape. Free list
MB /JB ENTERPRISES Box 724, Spencer, Iowa 51301.
Classified Advertising Cont'd on pg 120
125
ELECTRONICS
wo3EU=.3113
Electronics News
A3" FLOPPY DISK STANDARD has been agreedupon by three companies: Matsushita, Hitachi,
and Hitachi Maxell. The standardization will apply to the new 3" Compact Floppy Disk,
scheduled for U. S. distribution sometime this year. Though the 3" represents a smaller format
than the 5" Mini Floppy Disk currently in widespread use, it is compatible with the existing
drive system for the Mini Floppy and, by increasing the data density per track, offers the same
recording capacity, rotation speed, and data transfer rate. Chief advantage of the new format is
said to be its smaller size (8 cm W x 10 cm L x 0.5 cm D), permitting it to be carried in a shirt
pocket. Protective features associated with the standard 5" disks-write -protect, easy identification on the case, window shutters, etc-are retained in the new format.
PIEZOELECTRIC TECHNOLOGY has found a new application in dot-matrix printers:
quartz
piezo -crystals, sheathed between metal plates, could be substituted for the solenoids that
actuate wires in conventional dot -matrix printers, according to Piezoelectric Products, Inc.,
New Jersey. Because only a few milliamperes are necessary to cause rapid bending in a
piezo -crystal, the problem of ohmic heating does not arise. Thus, print speeds of up to 1000
characters per second are said to be possible without excess heat damaging the machine.
PINBALL GAME WIZARDS will soon be able to
hone their skills on a miniaturized, elec-
tronically controlled pinball machine at their
favorite pub. Called "Micropin," from Micro pin Corp., Pasadena, CA, the pinball machine
is designed to fit on a bar top -right next to
your Jack Daniels. It uses contactless Micro
Switch 8SS Hall-effect switches to activate the
flippers, ensuring especially long switch life.
Up to four people can participate in real metal -ball action. Furthermore, a rubber
shock mounting allows players to "gunch"
(nudge the machine from side to side to steer
the ball with less chance for a tilt penalty).
Scoring and sequencing are microprocessor controlled, with electronic digital LED display. High score is kept in memory and displayed. A bartender controls start of each
game from the compact (30" L x 13" W x 16"
H) machine's rear, including handling the
money (four balls for a quarter).
TALKING CHIPS will be supplied by Texas Instruments for Chrysler's 1983 model production.
Along with the TMS -P control processor, the chip set includes the TMS -6125 32 -bit ROM and
the TMS- 5110 -A speech processor, which uses TI's LPC (Linear Predictive Coding). The "talking car" will provide up to eleven messages that are digitally stored by a microcomputer
located in the glove compartment. The system will voice alerts such as "Your engine is
overheating prompt service is required." The message is delivered over the car radio -interrupting the program if the radio is on.
-
FIXED -DISC HOME AUDIO has been successfully tested by the Digital Recording Corp.
(Salt
Lake City, Utah). According to the company, a laboratory prototype of its patented in -home
digital audio player is now capable of reproducing high- fidelity music. The unit uses a low power laser beam to scan the digital code on a fixed, film-like record. The code is then converted
into an audio signal that is said to be virtually free of noise. One advantage reported over the
spinning disc is its potential for use with a device to change records.
AN ELECTRIC GUITAR that uses optical fibers instead of metal strings has been unveiled by
Dynamic Systems, Inc. of McLean, VA. Musical notes are created by tiny beams of light
contained within the fibers. According to inventor, George D. Bowley, many of the problems
associated with conventional electric guitars (such as noise ánd hum, limited frequency
response, cable length restrictions, and electric shock hazards ) are virtually eliminated by
fiber optics. The question is: will rock and rollers still be able to smash their equipment onstage
with the same short -circuit fireworks?
126
POPULAR ELECTRONICS
How to turn your HP-41
into a handh ld
uter.
ï
..we`:: wam
®. at.a++ vxun.
.x..
+.
...
t,_. ,-/
Introducing the
Hewlett-Packard
Interface Loop.
incredible 131,000 bytes of
ntass mcmorv:
starting today. your I1E 41(: r HP41 C V can be more than just treat
little calculator. It's a great File compute: capable of controlling quickly
expanding family of periphc gels.
The new Hewlett - Packarc Interface
ü
ae
-
( 1P-II. ) makes it all I ssihle. HPas _asp -to -use. low-ost in. rfatcing
., stern, spei:itìcally designed for batteryoperIble devices.
Loop
is
The Interface Module and
Peripherals.
At the heart of the system is the
Interface \lodule, which plugs into
any one of four HP-41 ports. You
can control up to 30 peripherals,
using only one port in your
HP -41 calculator.
One of the key HP-IL peripherals is the new Digital Cassette
Drive. This batteryoperable device
pr(rvides an
,.....»
Another Nvork- saving HP -II.
x'ripheral is the new, batteryoperable Thermal Printer,'
Plotter with enhanced
formating options and graphics.
This is just the beginning.
There are many more HP -II.
products on the way And they're all
designed to provide the versatility
and adaptability you expect from HP
' öu see. Hcyylett- Packard is committed
to a very-big idea: small devices talking
to each other, giving you big system
capabilities - at small system prices!
For details and the address of your
nearest dealer. CALL TOLL. FREE: 800
547 -3400, Dept.254(; except Hawaii'
Alaska. In Oregon, call 75iá -1010, or write
Hewlett- Packard, Corvallis. OR 9330,
Dept. 254G .TTY users (503) '58-5566.
.
ai 18
When performance must be measured t»' results.
I
P
HEWLETT
PACKARD
CIRCLE NO. 24 ON FREE INFORMATION CARD
Static Free
Stereo Sounds
In truth, your stereo is only as good as your music
source. Snaps, crackles, pops and hisses caused by
static on records can reduce even the best stereo
to sounding like an 1877 gramophone. However,
by using Discwasher® V.R.P. .M Valuable Record Protectors, the Discwasher® Zerostat ' Anti- Static
Instrument, and the Discwasher® D'Stato II Turntable Mat, you can effectively minimize or eliminate static problems, leaving your records static
free for clean stereo sounds.
Discwasher® V.R.P.,.Valuable Record Protectors are
super smooth, scratch free inner sleeves that effectively reduce the formation of static charges
when records are removed and replaced.
Discwasher Zerostat Anti -Static Inrtrument
yr
... .
The Discwashere Zerostat® Anti- Static Instrument
neutralizes static by showering records with positive and negative charges with the simple squeeze
and release of a trigger.
The Discwasher® D'Stat© Il Turntable Mat not only
reduces static charges during actual record playback but it also reduces sonic and mechanical
feedback between the record and the turntable
platter.
Discwasher V.R.P.
Valuable Record Protectors
Discwasher D'Stat
II
Turntable Mat
discwasher
PRODUCTS TO CARE FOR YOUR MUSIC
1407 North Providence Road, Columbia, MO 65201 USA
A DIVISION OF JENSEN
an ESMARK Company
CIRCLE NO 17 ON FREE INFORMATION CARD
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising