against auto theft - The Life of Kenneth

at
ectre
PROTECT YOUR CAR
AGAINST AUTO THEFT
Build
14
a
backyard satellite TV receiver
nifty things you can do with
Build
a
thunderstorm alarm
a
PRAM IC
$1.25 MAR. 1980
co
CO
CO
88
New for 1980 TV sets
New super class A hi-fi amplifiers
Circuits that talk back
Function.
Pulse And save.
---------CSC sets a new value standard. Twice.
FREQUENCY
R
l\ttt/to/0
6
t0
I
100
IOR
IM
1001,
fj_Tt.,
I
1/yti
"lIL
MODE
----I
I
OEf SE T
OFFSET
.6
RANGE
2001 FUNCTION GENERATOR
TTL
SWEEP IN
ONO
HI
O
O
MAX
LO
AMPLITUDE
OM= CCNTN.NTAL .PlCIALTI110
PULSE SPACING
PULSE WIDTH
too s
100.,5
t MS,
1
RUN
TRIG
,tOwS
----GATE
SHOT
WAVE
dOMPL
I
OT
AMPLITUDE
MODE
10MS.
N5
CONPOMIATtON
4001 PULSE GENERATOR
100MS'-+âs
IN
SYNC OUT
TTL OUT
10V
VAR OUT
R10
SPACING VEHN'IEH
\VIE11H
I1N1E.H
CMC
CONTPIONTAL YPOCIALTI.$ COMIPOPATMSN
Model 2001 Sweepable
Function Generator. $186.00'
Get the waveforms you need -1 Hz to .1 MHz in
five overlapping ranges: stable, low-distortion
sine waves, fast rise/fall-time square waves,
high linearity triangle waves-even a separate
TTL square wave output. Plus high- and lowlevel main outputs.
An applied DC Voltage at the Sweep input
can shift the 2001's frequency; or sweep up to
100:1 with an AC signal.
A pushbutton activates the DC Offset
control, which shifts the output waveform up or
down on command.
You'd expect to pay a lot more for all the
2001 can do!
Model 4001 Ultravariable
Pulse Generator." $235.00*
Here's a precision digital pulse generator with
fast rise and fall times covering 0.5 Hz to 5 MHz
in 5 overlapping ranges. With pulse width and
pulse spacing each independently variable
from 100 nsec to 1 sec for an amazing 107:1
duty cycle range.
You'll find the 4001 delivers the pulse
modes you need: Continuous, One -Shot, Triggered, Gated, Square Wave, even a Complement mode. The Trigger/Gate input, 50 Ohm
variable output, TTL-level output and Sync
output connectors are BNCs.
The 4001. Nothing does as much as well
for anywhere near the price.
Smarter tools for testing and design.
CONTINENTAL SPECIALTIES CORPORATION
70 Fulton Ten
New Haven. CT 06509 (2031 6243103. TWO 710.465.1227
OTHER OFFICES San Francisco (4151 421-8872 TWX 910-372-7992
Europe. CSC UK LTD Phone Saffron -Walden 0799-21682. TLX 817477
Canada Len F,nkler Ltd Downswew. Ontano
Call toll -free for details
1-800-243-6077
During business hours
.
.
Suggested U.S. resale. Available at selected local distributors. Prices, specifications subject to change without notice. t- Copyright 1979 Continental Specialties Corporation
CIRCLE 18 ON FREE INFORMATION CARD
NEW TECHNOLOGY
Cordless
wonder
For $89.95 the Mura cordless telephone
sounds like a bargain. But wait until
you hear about its many disadvantages.
The Mura cordless telephone represents a
major breakthrough in telephone technology.
cordless telephone was first introduced. In
fact, rather than install an extension phone,
why not consider the Mura instead?
TRY IT FIRST
We suggest you try the Mura Cordless
NOW THE CATCH
telephone system in your own home, office or
We mentioned that there was a catch-a few factory. Use it for 30 days. Take the phone to
major disadvantages that you, as the con- your next door neighbor's house or with you to
sumer, should know about before you con- the bathroom while you take a shower or bath.
Take it with you on your patio or balcony, or
sider purchasing this product. Here they are:
Forget About Dialing The new Mura Pocket bring it in your garden as you work. Use it in
ONLY IN AMERICA
in your office as
The Mura weighs only 12 ounces and Phone can't dial out. It only receives calls. To your factory as an intercom or
measures 11/2"x 23/4"x 61/2". The system in- many people, this doesn't matter because a remote telephone.
After you've given it a thorough test, then
cludes a base unit that plugs into your tele- 90% of remote phones are used to receive
phone jack. You carry your cordless telephone calls and not to place them. By eliminating the decide if you want to keep it. If not, no problem.
with you and when your phone rings, you press dial, Mura has cleverly saved consumers Simply return your system for a prompt and
courteous refund including your $3.50 posta button and answer. And you can talk to any- hundreds of dollars.
one as long as you remain within 400 feet of Forget About Steel Walls The Mura unit age and handling. You can't lose.
won't penetrate them. This means that if you
the base unit.
HERE'S THE WAY
But wait. We mentioned that the phone had want to use your phone in a factory with metal
To order your unit for a 30 -day test, simply
major disadvantages. And it does. But first, walls, your unit won't work. But for most facto- send your check for $89.95 plus $3.50 postlet's outline some of its major advantages. ries and practically all homes, the unit is ideal.
age and handling to JS&A Group, Inc., One
Convenience You don't need an extension Forget About Snooping The unit has only a JS&A Plaza, Northbrook, Illinois 60062.
telephone. With the Pocket Phone you have 400 foot range. At first this might seem awfully (Illinois residents please add 5% sales tax.)
an extension phone that you can take with short, but nobody can snoop in on your con- Credit card buyers, call our toll-free number
you-in the bath, in the den, in the garden, or to versations if that person is beyond this range, below. We'll send your base unit, cordless
and 400 feet is more than enough for most telephone, rechargeable batteries, recharger,
your neighbors.
Intercom You can use the base unit to page applications. Most cordless telephones complete instructions, our 90 -day limited
the person holding the cordless telephone. For operate in the 27 megahertz range-the same warranty, and the address of the closest Mura
example, if you're in your office and someone frequency area used for citizen band radios. Service Center or service -by -mail station.
Your unit is backed by Mura Corporation, a
outside has the unit, you can press a button on
17 -year old company famous for their microthe base unit and buzz the portable phonephones, headsets, and other audio products.
just like on an intercom. Simply by talking on
the phone plugged into your base unit, you can
JS&A is America's largest single source of
talk with someone on the remote phone. It's
space-age products-further assurance that
ideal for home or factory use.
your modest investment is well -protected.
Price The cost of the Mura remote telephone
Very often when a product's disadvantages
is only $89.95. Compare this price not only
aren't made clear to the consumer, that prodwith the cost of other $300 remote telephones
uct ends up being a disappointment. By exbut with conventional phones as well, and you
plaining the major disadvantages of the Mura
can appreciate what a major breakthrough the
cordless telephone, not only are we avoiding a
Mura system represents. But there's more.
possible disappointment, we're proving just
how great a product it really is. Order a Mura
You can plug any conventional phone into
cordless telephone at no obligation today.
the base unit and carry on a three-way conversation. You can answer a call at the base unit
The base unit for the Mura can also be used as
and signal the remote unit to pick up the line.
You can cut out the remote phone from the a personal paging system or intercom.
base unit if you want to keep a conversation The Mura uses the 49 megahertz range. This
PRODUCTS
private.
frequency has clearer reception with practically no interference.
TALK OF VALUE
The above are the disadvantages. For 90%
You can carry the cordless telephone with
®
you with its antenna collapsed and the battery of you, they don't mean a thing. For those 10%
Dept.RA One JS&A Plaza
recommend
we
would
who
need
a
dial,
you
you
of
unit,
beeps
your
a
call
When
on standby.
Northbrook, Ill. 60062 (312) 564-7000
simply extend the antenna, turn the power on, the more expensive cordless telephones.
800 323-6400
TOLL -FREE
Call
its
will
who
accept
But for those of you
and start to talk.
(312) 564-7000
The unit is FCC approved for connection disadvantages, you'll be in store for the great- In Illinois Call
©JS&A Group, Inc.,1979
directly into your telephone line. If you don't est idea in telephone convenience since the
It's about time. For years you've seen ads
for cordless telephones selling for between
three and four hundred dollars.
Now through some very clever planning and
a sprinkle of new technology, Mura Corporation has come up with a cordless telephone
that sells for $89.95. However, it has major
disadvantages that could totally discourage
you from buying the system-but more on that
later.
have a four -pronged jack or a modular connector, simply call your telephone company.
They'll promptly install a jack for you and the
cost will be around $15 or less depending on
your location.
o
TTHINK
WIRE CUTTING AND
STRIPPING DISPENSE
Model No.
WD -30 Patent Pendin
Wº
-TRE
R-30 -TRI
0,
CIRCLE 13 ON FREE INFORMATION CARD
Radio -
Electronics
THE MAGAZINE FOR NEW
IDEAS IN ELECTRONICS
MARCH 1980
Electronics publishers since 1908
SPECIAL
FEATURES
46
53
NIFTY WIRE -WRAP TRICKS
A few tricks that make wire -wrap projects easier, quicker
and sturdier to build. Otto Slack
SPEECH SYNTHESIZERS
Part 1-The new breed of circuits that talk back.
Martin Bradley Weinstein
BUILD
35
38
56
TECHNOLOGY
4
12
48
AUTOMOTIVE BURGLAR ALARM
Build it for less than $20. Automatic feature protects your
car without having to turn the alarm on or off.
Steve R. Stout
BACKYARD SATELLITE TV RECEIVER
Details of the LNA front-end gets you started building your
own backyard installation. Robert B. Cooper, Jr.
THUNDERSTORM ALARM
Simple radio accessory provides early warning of
approaching storm. Calvin R. Graf
LOOKING AHEAD
Tomorrow's news today. David Lachenbruch
SATELLITE TV NEWS
The latest happenings in an exciting new industry.
Robert B. Cooper, Jr.
IC APPLICATION NOTE
14 nifty applications for Harris Semiconductor's HA -2400
Vol. 51 No. 3
ON THE COVER
Featured on our newly designed
cover is OK Machine and Tool
Corporation's Just Wrap tool
shown being used to wire wrap
a prototype board. Also shown
is Vector Electronics P183
forming and cutting tool.
Wire -wrap construction has
many advantages over printed
circuit boards for prototype
construction. However, there
are also several disadvantages.
To find out how to overcome
many of these disadvantages
and how to make your wire wrap projects faster, easier and
sturdier, turn to page 46.
programmable amplifier.
60
HOBBY CORNER
64
plus more. Earl "Doc" Savage, K4SDS
NEW IDEAS
A winning circuit application from our readers.
A digital temperature sensor, a mosquito repelling circuit,
AUDIO
57
SUPER CLASS -A AUDIO AMPLIFIERS
New circuit technique radically reduces crossover
distortion. Len Feldman
VIDEO
42
WHAT'S NEW IN 1980 TV RECEIVERS
A look at the new circuitry being introduced in this year's
TV sets. Karl Savon
SERVICE CLINIC
Troubleshooting automatic brightness limiters. Jack Darr
SERVICE QUESTIONS AND ANSWERS
R -E's Service Editor solves technician's problems.
66
67
EQUIPMENT
REPORTS
24
25
30
32
DEPARTMENTS
Radio Shack Road Patrol Radar Detector
RCA Mini -State TV Antenna
Data Precision Model 938 Digital Capacitance Meter
American Beauty Micro -Soldering Station
14
Advertising Index
Advertising Sales Offices
81
78
Books
65
14
Editorial
Free -Information Card
72
102
103
16
75
6
Letters
Market Center
New Lit
New Products
Stereo Products
What's News
SUPER CLASS -A AMPLIFIER uses new circuit
techniques to radically reduce crossover distortion without any of the drawbacks associated with negative feedback. To discover how
it's done, turn to page 57.
Radio -Electronics, (ISSN 0033-7862) Published monthly
by Gernsback Publications, Inc., 200 Park Avenue South,
New York, NY 10003. Phone: 212-777-6400. Controlled
Circulation Postage Paid at Concord, NH. One-year subscription rate: U.S.A. and U.S. possessions, $13.00, Canada. $16.00. Other countries. $18.00. Single copies $1.25.
© 1980 by Gernsback Publications, Inc. All rights
reserved. Printed in U.S.A.
Subscription Service: Mail all subscription orders,
changes, correspondence and Postmaster Notices of
undelivered copies (Form 3579) to Radio -Electronics
Subscription Service, Box 2520, Boulder, CO 80322.
stamped self-addressed envelope must accompany all
submitted manuscripts and/or artwork or photographs if
their return is desired should they be rejected. We
disclaim any responsibility for the loss or damage of
manuscripts and/or artwork or photographs while in our
possession or otherwise.
A
products, techniques and scientific and technological developments.
As a service to readers, Radio -Electronics publishes available plans or information relating to newsworthy Radio-Electronics disclaims any responsibility for the safe and proper
Because of possible variances in the quality and condition of materials and workmanship used by readers,
magazine.
in
this
published
information
plans
or
or
from
upon
based
functioning of reader -built projects
RCA's videodisc: RCA will have its capacitance videodisc system in nationwide distribution in the first quarter of
1981, after shipping demonstration players and discs to its
distributors in December 1980. After nearly 15 years of
development, the company revealed its plans to distributors and the public. President Edgar Griffiths said that the
first players will sell for less than $500 each "in 1981 dollars" and discs of motion pictures and other entertainment
will be $15 to $20 each. He said RCA hopes to have 200,000
players in distribution in 1981 and forecast that videodisc
players would reach 30 -to-50% penetration of color TV
homes in 10 years, with disc sales of 200 to 250 million in
the tenth year. Griffith revealed that the disc system "represents the largest single investment in a consumer product in RCA's history."
Some disappointment was expressed by hi-fi dealers on
learning that the first player model would not be equipped
for stereophonic sound and, in fact, wouldn't even have a
jack for use with home stereo systems. RCA officials said
that later, step-up models and some future discs would
play in stereo, but that the first units were designed for use
with the 140 -million television sets that all have monophonic sound. Future models will feature freeze-frame,
slow-motion, reverse, and other special effects.
RCA announced its videodisc plans virtually on the first
anniversary of the start of marketing of the Philips/MCA
optical videodisc system in the U.S. The Magnavision player is produced by Magnavox (a subsidiary of Dutch Philips)
and the discs are made by DiscoVision Associates, a joint
subsidiary of MCA and IBM, and marketed by MCA. The
deluxe Magnavision player features all the special effects
that are only in RCA SelectaVision's future, but both players and discs were plagued by low production. It's estimated that only about 5000 players were sold in the three
markets (Atlanta, Seattle-Tacoma and Dallas) where they
were on sale. The player sells for $775 and movie discs for
$16 and $25, with shorter discs at lower prices.
Universal Pioneer, a Japan -based company owned jointly by Pioneer Electronics, MCA, and IBM, has supplied
more than 10,000 microprocessor -based industrial videodisc players to General Motors. They are compatible with
Magnavision players and can play standard DiscoVision
discs, as well as more sophisticated programmed and
indexed discs for use in automobile showrooms and for
personnel training. U.S. Pioneer, the audio -equipment
company, plans to have its own consumer optical disc player-also compatible with Magnavision-on the American
market at about midyear at under $1,000.
Other Japanese manufacturers haven't revealed their
home videodisc plans, but have experimented with different approaches. Many have taken out licensees for either
the RCA or the Philips/MCA approach or both, or have
developed their own non -compatible systems. Sony will
produce an optical player to the Philips/MCA standards,
but only for the industrial market-at least at first-and it
says it hasn't decided which approach to use for the consumer market. The Matsushita organization has demonstrated two different systems, both of them incompatible
with either of the two systems on the U.S. market, and says
that either one could be put into production quickly. Its
subsidiary, JVC, has a grooveless capacitance system
which is capable of all the special effects attainable in the
Philips/MCA optical system, while Matsushita Electric has
demonstrated a grooved mechanical technique designed
as a low-cost competitor to RCA's SelectaVision. Thomson-CSF of France sells an optical system, incompatible
with all others, on the industrial -institutional market.
Better audio for video:
The year's big "feature" in the
new television set lines is sound. In the 1980 models now
available, high -end sets take advantage of the full -frequency sound now being transmitted by the networks. Two
manufacturers, by coincidence, adopted the same name
for their new sound systems-Magnavox with "Super
Sound" and Sylvania with "Supersound." Magnavox's top of -the-line sets have 12 -watt amplifiers, three-way speakers and separate bass and treble controls. Other Magnavox sets feature increased amplifier power, better speakers
and improved frequency response. Some have tone controls, others "voice/music" switches. Sylvania's top -end
consoles have separate eight -watt amplifiers, two-way
speakers, separate bass and treble controls and a high
filter switch to eliminate noise from program sources such
as old movies. RCA's approach, called "Dual Dimension
Sound," is quite different. It's used in some 19- and 25 -inch
models that have speakers on both sides of the screen, and
simulates stereo. The speaker on one side carries low, and
high frequencies, while the other speaker has mid -low and
mid -high frequencies, giving a spatial effect.
In other new -set developments, RCA introduced a "Dynamic Detail Processor System" incorporating à new
comb -filter CCD IC, increasing picture resolution. Magnavox's Computer Color 330, now in 75% of its line, uses a
glass delay line to accomplish the same effect. RCA also
introduced a 19 -inch set with pushbutton "Autoprogrammer," on which seven days of programming can be set up
in advance via a keyboard panel. Magnavox features a
MPU keyboard tuning system that eliminates all fine-tuning
and can receive mid -band cable TV channels without a
converter box.
De -ghosting: Broadcast television's major bugaboo, the
ghost, is under all-out attack through a variety of exorcizing
programs. Some stations are now adopting circular polarization, that cuts down ghosts on rabbit -ears and can help
eliminate ghosts for outside -antenna installations, toobut special outdoor antennas must still be used. TDK and
others have developed ferrite -concrete coating materials
that make tall buildings virtually "invisible" to TV signals by
absorbtion-but that is a very expensive process. In Japan
and the U.S., many firms are working on electronic de ghosting systems. GTE Labs has demonstrated one which
uses the LSI equivalent of 20,000 transistors. It indentifies
the first ghost as identical to the primary signal, notes the
magnitude of the signals and the distance apart. It then
produces a signal equivalent to that of the ghost but of
opposite polarity. That generated "ghost" cancels out the
original, undesired ghost. The same function is accomplished many times in a transversal filter, to suppress multiple echoes.
www.americanradiohistory.com
DAVID LACHENBRUCH
CONTRIBUTING EDITOR
The VIP hobby computer:
Start programming for only $99.
41U'
i,°i°i",=
i
New! VP 111
....$99
Microcomputer
Assembled* and tested.
New low price!
The original VIP ..
Completely assembled
and tested.
19 9.
Features:
RCA 1802 Microprocessor.
All the features of the VP -111 plus:
1K Bytes static RAM.
A total of 2K Bytes static RAM.
Expandable on -board to 4K.
Power supply.
Expandable to 32K Bytes total.
8 Bit input port.
512 Byte ROM operating system.
8 Bit output port.
CHIP -8 interpretive language or
I/O port connector.
machine language programmable.
System expansion connector.
Hexidecimal keypad.
Built-in speaker.
Audio tone generator.
Plastic cover.
Single 5 -volt operation.
Three comprehensive manuals:
Video output to monitor or modulator.
VIP Instruction Manual -20 video
Cassette interface-100 Bytes/sec.
game listings, schematics, much more.
Instruction Manual with 5 video game
VIP User's Guide-operating instruclistings, schematics, CHIP -8, much more! tions and CHIP -8 for the beginner.
RCA 1802 User's Manual (MPMIdeal for low-cost control applications.
201
B) - complete 1802 reference guide.
with
capability
Expandable to full VIP
VP-114 Kit.
RC,'
*User need only connect cables (included), a
5 -volt power supply, and speaker.
Please send me the RCA COSMAC VIP items indicated.
VP-111 New low cost Microcomputer
$99
(See description above)
VP -114 Expansion Kit for VP-111-Includes
$ 76
3K RAM, I/O Port and connectors
VP -711 VIP-The original VIP Microcomputer
$199
(See description above)
VP -44 RAM On -Board Expansion Kit-Four
2114 RAM IC's. Expands VP 711
memory to 4K bytes
$ 36
VP -590 VIP Color Board-Converts VIP to
color. Four background and eight
foreground colors
$ 69
VP -595 VIP Simple Sound Board-Provides
256 programmable frequencies. For
simple music or sound effects.
Includes speaker
$ 30
VP -550 VIP Super Sound Board-Turns your
VIP into a music synthesizer! Two
independent sound channels. Onboard tempo control. Outputs to
audio system
$ 49
VP -551
4 -Channel Super
Sound-Includes
VP -576 expander, demo cassette
and manual. Requires VP -550 and
4K RAM
VP -570 VIP Memory Expansion Board
Plug-in 4K RAM memory
VP -580 VIP Auxiliary Keypad-Adds two player interactive capability. 16 -key
keypad with cable. Connects to
sockets on VP -590 or VP-585
VP -585 VIP Keypad Interface Board-Interfaces two VP -580 Auxiliary
Keypads to VIP
-
$ 74
VP -560 VIP EPROM Board-Interfaces two
2716 EPROMs to VIP
VP -565 VIP EPROM Programmer BoardPrograms 2716 EPROMs.
With software
D VP -575 VIP Expansion Board-Provides 4
buffered and one unbuffered
expansion sockets.
VP -576 VIP Two -Board Expander-Allows
use of 2 Accessory Boards in either
/O or Expansion Socket
VP -601 ASCII Keyboard -128 -character
ASCII Encoded alphanumeric
keyboard.
I
$ 34
$ 99
$ 59
$ 20
IIIiF,6.'1..:.;,'
COSMAC VIP lets you add
computer power a board
at a time.
With easy -to -buy options, the versatile
RCA COSMAC VIP means even more
excitement. More challenges in
graphics, games and control functions.
For everyone, from youngster to serious
hobbyist.
Built around an RCA COSMAC microprocessor, the VIP is easy to program
and operate. Powerful CHIP -8 interpretive language gets you into
programming the first evening.
Complete documentation provided.
Send the coupon now...
Complete the coupon below and mail to:
RCA VIP Customer Service, New
Holland Avenue, Lancaster, PA 17604.
Or call toll free (800) 233-0094
to place your Master Charge or VISA
credit card order. In Pennsylvania,
call (717) 397-7661, extension 3179.
VP -611 ASCII / Numerc Keyboard-Same
as VP -601 plus 16 key numeric
keypad.
VP -620 Cable: Connects ASCII keyboards
$ 80
to VIP.
$ 20
VP -700 VIP Tiny BASIC ROM Board-BASIC
4K
ROM.
in
of
code stored
$ 39
VP -710 VIP Game Manual-Listing for 16
exciting games
$ 10
VP -720 VIP Game Manual-II-More exciting
games (Available 2nd qtr. '80)
$ 10
MPM- CDP1802 User Manual-(Included
with VP -711)
2018
$ 5
Please send more information
-
'
$ 65
for items checked plus shipping & handling charge of $3.00.
Enclosed is $
Total enclosed $
Add your state and local taxes $
enclose D check or money order or, charge my VISA/Bank Americard
Master Charge.
I
Credit card account No.
Master Charge Interbank No.
Expiration date
$ 95
Signature (required for credit card orders)
Name (please type or print)'
Street address:
$ 20
State & Zip:
$ 15
Make checks payable to RCA Corp. Prices and specifications are subject to change
without notice.
GICLE 9
City:
Telephone:
ON FREE INFORMATION CARD
(
)
what's news
Automotive manufacturers see day
of electronics arriving
The long -predicted day of the takeover
by electronics in the auto industry has finally arrived, according to analysts of The New
York Times. After electronic ignition became pretty much standard, there was a
pause, during which there was little further
application of electronics in the automotive
field. Now, according to Peter J. Schuyten
of the Times, "tiny microprocessor -based
systems are overseeing such vital engine
functions as exhaust -gas recirculation and
air -fuel ratios. Integrated circuits are being
incorporated in door -lock assemblies, on
the dashboard and in automotive enter-
tainment systems."
This sudden surge, says the Times,
could-with the imminent addition of such
functions as transmission control and electronic braking-mean a market of nearly
$4 billion by 1990.
This sudden "windfall" may be as much
a problem as an opportunity for the semiconductor industry. Increasing markets in
other fields are already taking up practically the full capacity of the semiconductor
plants, and a surge of orders from Detroit is
likely to prove embarrassing. The automakers may well have to turn their attention
abroad. Ford is already buying circuit chips
from Toshiba, and General Motors is said
to have signed contracts with several Euro-
pean suppliers. (R -E readers have known
about this for years; about time everyone
else "discovered" it.-Editor)
Report from GermanyIC's, new uses for TV, up
The use of transistors in German TV sets
has dropped off sharply, members of the
international press were told at a conference arranged by the International Radio
and TV Exhibition 1979 at Berlin. Con-
versely, the number of integrated circuits is
rising. The discrete components are being
replaced by IC's. Production of TV receivers is also rising sharply-almost doubling
in the past four years.
Electronic methods have almost completely superseded mechanical devices in
the tuning circuits, and selection of 12 to 30
stations is standard. Remote control, a regular feature in color sets, began in 1977 to
shift from ultrasonic to infra -red devices,
and the microprocessor took over part of
the process of station selection.
The first experiments with stereo television sound and dual -language sound are
being carried out in West Germany. (In
dual-language sound, the two stereo channels carry different languages instead of
stereo-a re-broadcast American show
may have English on one channel and a
German translation on the other.)
With the prices of electronic memories
FUEL
AIR CHARGE
CALIBRATION
MODULE
CONTROL
ASSEMBLY
POWER
RELAY
INJECTORS
TEMPERATURE
SENSOR
EGR
THROTTLE KICKER ACTUATOR
THROTTLE KICKER SOLENOIDS
EGR SOLENOIDS
VALVE
IGNITION
MODULE
\
\\\
ENGINE COOLANT
TEMPERATURE SENSOR
EXHAUST GAS
OXYGEN SENSOR
German Post Office, and of Teletext by the
broadcasting authorities, are due to commence in 1980; satellite television is presently expected to reach the experimental
stage by 1983.
U. S. ambitions meet setback
at Geneva WARC sessions
United States efforts at the World Administrative Radio Conference (WARC) to
expand its allocations of the world's broadcast frequencies, to increase its share of
the spectrum for governmental and scientific use, and to meet the growing demands
of the exploding communications activity
were largely unsuccessful. Opposition to
the United States proposals came largely
from the underdeveloped Third World nations. Those countries had been given
scanty allocations at former conferences
(which are held roughly every 20 years).
Many of them were in fapt colonies of the
larger Powers when some of the earlier
conferences were held.
The United States delegation held that
the airwaves should be made available to
the countries now most in need of them,
rather than allocated to nations who have
no present capability of using them. The
small -nation approach is that if they do not
do something to get a share of the frequencies immediately it will soon be too late
even to try.
Armando Vargas of Costa Rica, a prominent proponent of the Third -World view
that was forwarded vigorously by a 12 nation Latin American coalition, gives
much credit to the instruction and counsel
given the coalition by American and British
public -interest organizations. They offered
their support, Mr. Vargas said, because the
interests of the developing nations are similar to those supported by public -interest
groups in the industrialized ones.
"We both want to see the frequencies
used for the types of satellites that provide
inexpensive social services-education for
people in remoté areas or health and agricultural consultations," said Mr. Varga.
"The industrial countries
.
are interested in huge satellites for widespread
communications, which small countries
can't afford."
Ralph Jennings, deputy director of the
United Church of Christ's Office of Communications, set forth a parallel but somewhat different approach:
"With us, the issue is an ethical one.. . .
It is in the long-range interest of our own
country to recognize that the undeveloped
nations have legitimate rights to the airwaves. They don't want to be left way
behind in the next century."
.
FUEL PUMP
RELAY
SECONDARY AIR
DUMP SOLENOID
SECONDARY AIR
PORT SOLENOID
dropping drastically, it is expected that
such uses as Teletext and Viewdata, as well
as intelligent games, will tend to become
universal. Field trials of Viewdata by the
CANISTER PURGE
SOLENOID VALVE
CRANKSHAFT
POSITION SENSOR
COMPOSITE
PRESSURE SENSOR
ELECTRONIC COMPONENTS of the new Ford V-8 engine used in the 1980 Lincoln Continental and
Mark VI. No less than six of these are sensors of the various engine conditions, information from
which is used to control the electronic fuel injection and other functions to limit emissions while
promoting fuel economy. Electronic components are also used to control the entertainment apparatus, remote -control the CB equipment, and even to open the doors.
www.americanradiohistory.com
.
Facts from Fluke on low-cost DMM's
Three good reasons to buy your
handheld DMM from Fluke.
Ask yourself what you're really
looking for in a handheld DMM, and
then take a good long look at ours.
CHOICES? The Fluke line of
handheld DMM's now offers three
clear performance choices. There's the
8022A Troubleshooter, a solid value for
basic voltage/current/resistance
measurements that offers 0.25% basic
do accuracy. The 8020A Analyst is the
world's best-selling DMM and first to
offer conductance for high-resistance
-
measurements to 10,000 Megohms
now with accuracy improved to 0.1%.
And the new 8024A Investigator, a
powerful instrument also with 0.1%
accuracy that boasts three unique
capabilities: logic level/continuity
detection with an audible "beeper" for
instant continuity testing, and
slow -speed logic checking, peak hold to
lock onto elusive transient signals, and
direct temperature readings to 1265°C
via K-type thermocouples.
CONVENIENCE? Pick one up
and you'll know what true one-hand
operation means tough, lightweight,
palm-size packages designed with
in -line push buttons for quick range
and function changes.
RELIABILITY? Count on it. A
substantial number of components are
used exclusively to insure
reliability and
to guard
against
overloads.
-
Calibration is traceable directly to the
National Bureau of Standards.
LOW COST? Compare these U.S.
prices: $129 for the 8022A, $169 for the
8020A and $199 for the powerful 8024A.
Fluke standards of quality and
customer service, of course, are
uncompromising -for our line of
handheld DMM's and all our products.
For more facts call toll free
800-426-0361; use the coupon below;
or contact your Fluke stocking
distributor, sales office or
representative.
!FLUKE'
IN THE CB. AND NONEUROPEAN COUNTRIES:
John Fluke Mfg Co., Inc.
P.O. Box 43210 MS#2B
Mountlake Tenace, WA 93043
(206) 774-2481
IN EUROPE:
Fluke (Holland) B.V.
P.O. Box 5063,
5004 ED erlands
The Nether
(013) 673 973
Telex: 32-0013
Th: 52237
Please send all the facts on Fluke
low-cost DMM's.
Please have a salesman call.
Name
lité
Company
Address
Zip
City
Telephone
(
)
Ext.
NRI will train you at home
to be an electronics professional
in the growing world
of communications.
Learn to service, repair, and install everything from microwave antennas
to two-way radios... from radar sets to TV transmitters.
Marine Communications
Aviation Communications & Navigation Systems
Direction Finders, Loran
No other home -study course
gives you such complete, professional
training in so many fields of communication. No other gives you the
actual bench training with kits and
demonstration units specially designed
for learning. Only NRI gives you the
thorough preparation and training
you need to achieve professional
competence in the wide world of
communications.
Learn at Home
in Your Spare Time
Learn at your own pace, right in
your own home. There's no need to
quit your job or tie up your evenings
meter and digital CMOS frequency
counter. NRI even gives you special
lessons to get your Amateur License so
with night classes. No time or gas
wasted traveling to school...NRI
brings it all to you. You learn with
NRI-pioneered "bite -size" lessons and
proven, practical "power-on" training.
Build Your Own 2 -Meter,
Digitally Synthesized
VHF Transceiver
or
40 -Channel CB
NRI training is "hands-on"
training. You get honest bench experience as you build and test this
industrial -quality two-way radio and
power supply. You reinforce theory lessons as you induce and correct faults,
study individual circuits and learn
how they interface with others. Or, at
your option, you can train with a full
forty -channel mobile CB and basestation power supply converter.
You also build and keep for use
in your work a transistorized volt -ohm
you can go on the air with your VHF
transceiver.
FCC License
or Full Refund
4116
In all, you get 48 lessons, 9
special reference texts, and 10 training
kits... the training you need to become
a professional. And NRI includes training for the required FCC radiotelephone license examination. You pass
or your tuition will be refunded in
full. This money -back agreement is
valid for six months after the completion of your course.
Free Catalog,
CB
Mobile Radio
Radio
No Salesman Will Call
NRI's free, 100 -page full -color
catalog shows all the equipment you
get, describes each lesson and kit in
detail, tells more about the many
specialized fields we train you for. It
includes all facts on other interesting
areas like TV and audio servicing or
digital computer electronics. Mail the
postage -paid card and see how we can
make you a pro.
If the card has been removed,
write to:
Ill
!`j:
I
ri
NRI Schoo
Ï
McGraw-HilllsContinuing
Education Center
3939 Wisconsin Ave.
Washington, D.C. 20016
The satellite TV pioneer
Those who have been following the series of articles in
Radio -Electronics describing the challenges offered in establishing your own private satellite TV earth station know well that
the excitement attached to this project is almost uncontrollable.
The combination of high -quality programming, great diversity
of channels, and being involved in man's conquest of our near space environment is an unbeatable combination
For the pioneer, these are trying times. Less than one year ago
you couldn't find any information about satellite reception and
what you did find was more often than not written for then practitioners of "the art." The neophyte, desirous of learning
the basics from the ground up, was hard pressed to locate starting data. Now there is plenty of information available. Much of
it describes work done on a custom basis by talented pioneers
who are more intent on making their own first terminals sit up
and operate than in providing how -to-do -it data for others with
less experience in microwave system design and operation.
Plainly what is needed more than anything else at the moment
is a handful of dedicated sources for the specialized circuit
boards and microwave-family component parts that a private
satellite terminal requires. It would appear that within the next
60 to 90 days several such sources may develop and begin shipping parts kits and circuit boards on demand, in quantity. We
intend to watch the development of this very carefully and we
will keep you advised monthly, as circuit boards and parts kits
become available. Those who have products in these areas
should in turn see that we know about your products as rapidly
as possible, recognizing that there is a 60-75 day delay between
your telling us about such equipment and our first opportunity
to discuss it here in this monthly news column.
Licensing Deregulation
As most readers are undoubtedly now aware, on October 18,
1979 the FCC determined that builders of satellite TV terminals are no longer required to obtain an FCC license to construct
their terminals. Before that ruling, every cable-system constructor of a satellite terminal was supposed to go through a lengthy
(and expensive) license -application process. Most private (i.e.,
non-commercial) terminal builders were ignoring that rule. The
Commission, perhaps mindful of the difficulty presented in
tracking down "unlicensed receive stations," simply decided to
eliminate the requirement; now you may build your terminal
without any type of federal license.
However, both the FCC and the satellite program operators
maintain that while you may build a terminal without a license,
you may not watch anything with it (!) unless you have the
written authority of the programmers using the satellite. The
FCC states that, because all satellites are licensed in a special
type of service called fixed point-to-point common carrier, and
the downlink transmission band is in turn "fixed" by international agreements for non-broadcasting use, none of the present -generation satellites may engage in broadcasting in the sense
that people are free to simply tune in their transmissions. That
issue will undoubtedly end up in the courts. For now the simplest way to "stay clean" is to obtain a letter of authorization
from at least one satellite -programming source that approves
your tuning in that source's programming transmitted via satellite. Several of the present satellite programmers have been
authorizing individuals to receive their satellite transmissions
without charging a fee for the programming. (Others grant
authorizations, but only after requesting fees as high as $96 per
year.) Here are four such services you can contact:
1. PTL (Praise The Lord), transponder 2, Fl. Mr. Gary
Deaner, PTL Satellite Network, Charlotte, NC 28279.
2. CBN (Christian Broadcasting Network), transponder 8,
FI. CBN, Inc., Pembroke Four, Virginia Beach, VA
23463.
3. KTBN (Trinity Broadcasting Network), P.O. Box A, Santa Ana, CA 92711.
4. Satellite Magazine (Satellite Television Technology), P.O.
Box G, Arcadia, OK 73007.
Since the FCC did away with the mandatory license requirement, a number of the satellite programmers have developed the
attitude that they do not want private terminal viewers. Many
cable -system operators feel uncomfortable with the prospect
that, one day, home viewers will have access to satellite programming on their own without the cable system's satellite
receiving terminal as an inter -connection; and considerable pressure is being placed on the satellite programmers by the cable
firms. That pressure translates to "Don't authorize private viewers to watch your satellite service if you want the cable firms to
subscribe to your service." That aspect also is in an evolutionary
state.
One proposal to remedy the situation has come from Comsat,
the U.S. company that represents U.S. interests in the worldwide INTELSAT network. Comsat is suggesting a special (new,
not yet designed or launched) satellite that would offer up to six
channels of direct -to-the -home satellite -delivered television for
a monthly fee-a sort of cable service without the cable. The
theory is that if people were offered six channels of high -quality
satellite TV that was specifically designed for home viewing, the
interest in pirating cable TV programs directly from the present
satellites would fade away. Whether that proposal flies or not
remains to be seen; as of now, the earliest date that such a
service could become operational is five to six years ahead. For
the present, then, the problems associated with the "cable related programming" continue.
Scrambling
One proposed solution to insuring that only those receiving
terminals authorized to receive transmissions may do so has
been advanced by Home Box Office (HBO), which is carefully
considering several technical proposals that will enable them to
scramble (as in encode) their satellite transmissions. The technology for scrambling certainly exists. Unfortunately, anything
that can be scrambled can also be descrambled; and to expect
several thousand authorized reception terminals to stand guard
over their descrambling boxes day and night may be too much to
ask of anyone. Every scrambling technique advanced to date has
one major drawback: It introduces some degradation to the picture even when properly descrambled. One of the big selling
points for HBO and other premium (i.e., movie) services has
been the high technical quality of their picture. To degrade that
picture quality purposefully as a trade-off for security may make
good technical sense, but would be a poor business decision.
Again, we'll watch this development and keep you advised. You
should be aware that few (perhaps four or five) of the present
satellite programmers have indicated any interest in scrambling
their satellite signal; most recognize that the disadvantages (for
now) far outweigh any benefits.
12
www.americanradiohistory.com
ROBERT B. COOPER, Jr.
setr
BUY ONE
of these
great professional books and
ET ONE FREE
(values up to $60.00)
when you join the
COMPUTER
PROFESSIONALS'
BOOK CLUB
Choose any one of these books at the special club discount, and
select any other as your gift Free of Charge when you enroll:
AUTOMATIC DATA PROCESSING HANDBOOK
Edited by The Diebold Group, Inc.
Club Pr., $25.75
Pub. Pr., $38.95
1681075
PROGRAMMING LANGUAGES By A.B. Tucker, Jr.
Club Pr., $16.50
Pub. Pr., $22.00
654/158
MINICOMPUTER SYSTEMS, 2nd Ed. By
Eckhouse
7871026
Pub. Pr., $21.95
R. H.
Club Pr., $16.50
MICROCOMPUTERS/MICROPROCESSORS:
Hardware, Software & Applications By J. L.
Hilburn &
771/499
P N.
Julich
Pub. Pr., $22.50
Club Pr., $16.50
MICROPROCESSOR APPLICATIONS MANUAL
By Motorola, Inc.
435/278
Pub. Pr., $38.00
Club Pr., $26.50
THE 8080A BUGBOOK: MICROCOMPUTER IN-
TERFACING AND PROGRAMMING By
Rony, D. G. Larsen & J. A. Titus
Pub. Pr., $9.95
7831845
R
R.
Club Pr., $8.45
MICROCOMPUTER -BASED DESIGN By J. Peat man
491/380
701/30X
Club Pr., $18.95
Pub. Pr., $26.50
DATA BASE DESIGN By
G.
HANDBOOK OF OPERATIONAL AMPLIFIER
Wiederhold
Club Pr., $18.25
Pub. Pr., $24.50
PRINCIPLES OF INTERACTIVE COMPUTER
GRAPHICS, 2nd Ed. By W. M. Newman & R. F.
Sproull
463/387
Club Pr., $19.95
Pub. Pr., $24.95
PROGRAMMING FOR MINICOMPUTERS By J.
Cluley
785/49X
HOW TO DESIGN AND BUILD YOUR OWN CUSTOM TV GAMES By D. L. Heiserman
Club Pr., $11.95
Pub. Pr., $14.95
786/585
C.
CIRCUIT DESIGN By
D.
F.
Stout, edited by M.
Kaufma n
617197X
Pub. Pr., $29.95
Club Pr., $17.50
ANALOG SYSTEMS FOR MICROPROCESSORS
AND MINICOMPUTERS By R. H. Garrett
786496
Pub. Pr., $18.95
Club Pr., $14.95
ENCYCLOPEDIA OF COMPUTER SCIENCE
Club Pr., $13.50
Edited by A. Ralston & C. L. Meek
Club Pr., $39.95
Pub. Pr., $60.00
769101X
REAL-TIME PROGRAMMING WITH MICRO-
MICROPROCESSOR AND MICROCOMPUTER
SYSTEMS By G. V. Rao
Pub. Pr., $17.50
COMPUTERS By
786/372
R. C.
Turner
Pub. Pr., $16.95
Club Pr., $13.95
MEMORY DESIGN: Microcomputers and Mainframes By Electronics Magazine
Club Pr., $15.50
Pub. Pr., $18.50
191/549
Why YOU should join now!
BEST BOOKS IN YOUR FIELD -Books are selected from a wide
range of publishers by expert editors and consultants to give you
continuing access to the latest books in your field.
BIG SAVINGS -Build your library and save money too! We guarantee savings of at least 15% off publishers' list prices on every book.
Usually 20%, 25% or even higher!
BONUS BOOKS -You will immediately begin to participate
in our Bonus Book Plan that allows you savings between
70-80% off the publisher's price of many books.
r
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, postage and handling. If
not satisfied, may return the books within 10 days and my membership will be canceled.
agree to purchase a minimum of 3 additional books during the next 2 years as outlined
under the club plan described in this ad. Membership in the club is continuous but
cancellable by me any time after the four book purchase requirement has been fulfilled.
I
I
-it
expense.
As a Club member, you agree only to the purchase of four books
(including your first selection) over a two-year period.
Write Code N of
FIRST selection here
Write Cade N of
selection here
FREE
Orders from outside the U.S. must be prepaid with international
money orders in
U S.
dollars.
Charge my
CONVENIENCE -14 times a year you receive the Club Bulletin
FREE, fully describing the Main Selection and alternate selections,
together with a dated reply card. If you want the Main Selection, you
will be shipped automatically. If you want an
simply do nothing
alternate selection -or no book at all -you simply indicate it on the
regular reply card and return it by the date specified. You will have at
least 10 days to decide. If, because of late mail delivery of the Bulletin
you should receive a book you do not want, just return it at the Club's
Club Pr., $19.50
Pub. Pr., $24.50
7831659
THE Z-80 MICROCOMPUTER HANDBOOK By W
Barden, Jr.
Club Pr., $7.60
Pub. Pr., $8.95
784/914
Credit Card
VISA
k
MASTER CHARGE' Exp. Date
'MC Bank N
Signature
Name
Address
City, State, Zip
Corporate Affiliation
This order subject to acceptance by McGraw-Hill. All prices subject to change without
notice. Otter good only to new members. A postage and handling charge is added to all
shipments.
P391432
j
éditorial
Radio-
Electronics
®
Hugo Gernsback (1884-1967) founder
M. Harvey Gernsback, editor -in -chief and
publisher
Larry Steckler, CET, editor
Arthur Kleiman, managing editor
Robert F. Scott, CET, W2PWG,
Times Change
Over the past 50 years, Radio -Electronics has come to you in a
package with several different labels. In July 1929, it was Radio Craft (our first issue). In 1949, the name was changed to Radio Electronics and was printed in a stencil typeface. In 1957 the name
was not changed, but the typeface was. And that's the way it stayed
until this issue.
No! We have not changed the name, but we have given it a much
more modern look-one that is inspired by the "electricity" in our
industry. The change, the growth, the excitement.
The content has not been changed. It is still the firm in-depth
editorial coverage that has made and kept Radio -Electronics your
Number 1 Authority in this industry, and we intend to keep right on
delivering that kind of information.
This month, for example, we show you how to build a low -noise
amplifier for the front end of a Backyard Satellite TV receiver. There
are some Nifty Wirewrap Hints; a story on how to Build Your Own
Automotive Burglar Alarm; another on Using An IC PRAM; a look at
Super Class -A Audio Amplifiers; and the first part of a feature on
Speech Synthesizers. And that's only part of what you can discover
this issue.
this kind of solid editorial content that keeps you reading
Radio -Electronics, and it is the kind of editorial content you will
continue to find in our pages. When something new happens-like
computers or satellite TV reception, we will be sure to bring it to
It is
you.
We would like your comments on our new look, even if you
disagree with our choice. But we really hope that you'll like it;
obviously we do!
technical editor
Jack Darr, CET service editor
Leonard Feldman
contributing high-fidelity editor
Karl Savon, semiconductor editor
Herb Freidman, communications editor
David Lachenbruch, contributing editor
Earl "Doc" Savage, K4SDS, hobby editor
Ruby Yee, production manager
Robert A. W. Lowndes, production
associate
Marie J. Stolfi, production, assistant
Gabriele Margules, circulation director
Arline R. Fishman,
advertising coordinator
Cover design by Louis G. Rubsamen
Cover photo by Robert Lewis
Radio Electronics is indexed in Applied
Science & Technology Index and Readers
Guide to Periodical Literature.
Gernsback Publications, Inc.
200 Park Ave. S., New York, NY 10003
(212) 777-6400
President: M. Harvey Gernsback
Vice President: Larry Steckler
Secretary/Treasurer: Carol A. Gernsback
ADVERTISING SALES
Paul McGinnis
Director of Marketing
EAST
Stanley Levitan
Radio -Electronics
200 Park Ave. South
New York, NY 10003
(212) 777-6400
MID WEST/Texas/Arkansas/Okla.
Ralph Bergen
The Ralph Bergen Co.
540 Frontage Road-Suite 361-A
Northfield, Illinois 60093
(312) 446-1444
LARRY STECKLER
Editor
PACIFIC COAST
Mountain States
Jay Eisenberg
J.E. Publishers Representative Co.,
8732 Sunset Blvd.,
4th Floor,
Los Angeles, CA 90069
(213) 659-3810
Sales Mart Building
1485 Bayshore Blvd., Box 140
San Francisco, CA 94124
(415) 467-0125
o
www.americanradiohistory.com
Yv
SHORTCUTS
Breadboard and test the faster and easier way.
Solderless, of course.
Your breadboarding is a
super-snap with an AP Super-Strip
Build a circuit almost as fast you dream it
up. Pull it apart and do anothereverything's as good as new. Your A P
Super-Strip combines an 8 -bus
power/signal distribution system with a
matrix of 128 terminals, each with 5 tie
14-pin
Altogether, you have 840 plug-in
solderless tie points. No need for special
patch cords either-use Solid 22 AWG
Wire. Where to buy? Read on.
points.
It
accommodates up to nine
DIPs.
With Non -corrosive Alloy 770 terminals, $17. With
Win
RR
RIM
'WOW
MR
ROOM
iri
R
O
MU
ORR I
WO
basic breadboarding building blocks.
When you take on a project that's too
OUR
Rr
MR
We
OO
s
RRRRi...+RR
OM
IS
IRO
A P Terminal and Distribution Strips Your
UMW!
RsamMOMM08RR
RRRUIRie.rm
RrrRR RRRR
R
RIRRRMR
RV
I
OIwR
um
IRIS
-
IRR
IR
Distribution Strips with 2 or 3 strips, from $2.
Terminal Strips with up to 128 terminals from $4.75.
A P All -Circuit Evaluator...The best, or
assemble your own and get the best for less.
Your A P "ACE" will save you time-time
after time-because there's no faster or
easier way to prototype. You plug in
your circuit, add power, and test.
It's super -fast breadboarding,
with the electronic integrity
you get in all A P products.
Our solderless plug-in tie
points are a special
non-corrosive alloy.
Use them over
and over again.
Same good
kits,
Distributor. Where? Read on.
test clip. A heavy-duty industrial -grade steel
spring maintains firm contact pressure. No
intermittents. No shorts. Ever. Contacts are goldplated phosphor bronze arranged in a "contact
comb" which separates contacts precisely. New,
narrow-nose design fits highest-density boards.
Flat contacts won't roll off IC leads.
Engineering -grade thermoplastic body
is molded around contact pins. Nail head pin rows offset for easy probe
attachment (straight-pin) models for
connector attachment, too). We'll tell
you where to get your A P test clipand we'll send you our complete A P
catalog, The Faster and Easier Book.
frfefffeftff
connections
2
big for your A P Super -Strip, use these
A P modules. Now you've got the world's
easiest way to assemble full-performance,
solderless bread -boards of any size or
shape. Our terminal and distribution strips
come in 11 configurations, all with universal
.1" x .1" matrix, accept all components with
leads up to .032" diameter, connect with
any solid wire up to No. 20 AWG. No
special patch cords. Get as few or as
many as you need at your nearby A P
Now experience the easiest
way there Is to trouble -shoot DIP ICs.
Our new A P Super Grip II is the ultimate
everytime. Our A P "ACE"
kits are a snap to assemble.
or
gold-plated terminals, $24.95.
5 assembled models
available from $18.95.
A P Super Grip II test clips in 8, 14, 16,
16LSI, 18, 20, 22, 24, 28, 36 and 40 -pin models from $4.50.
Where to buy? Phone (toll -free) 800-321-9668.
A P PRODUCTS INCORPORATED
1359
W.
Jackson
St.,
Painesville, Ohio 44077
Tel.
216/354-2101 TWX: 810-425-2250
CIRCLE 82 ON FREE INFORMATION CARD
TECHNOLOGY
read your editorial in the June 1979 Edition, and right on!
It's a very common opinion today that at
some point technological improvement just
stopped and no further innovation is necessary. We have a car that works. Stop. We
have radios that work. Stop. We have computers that work. Stop.
Upon closer examination, however, we
find that our cars don't work all the time
and they don't last very long, either. Sure
we have radios, but have we reached the
full potential? The computers are marvels,
but can we direct them to more human type
thinking? Are there other methods of approaching or perhaps improving the comI
puter concept?
Inventors and designers know the potential and most realize that the process of
innovation can almost be carried out to
infinity. But more and more today, fewer
people will listen. All the immediate needs
have been satisfied. They may then shut off
the switch on the flow of new ideas. It is
ironic that the ones who are most likely to
laugh at the new breakthroughs are often
the most knowledgeable in the field. Has
the credential of expertise also become the
license to play God?
K. RHOTEN
Schererville, IN 46375
seem to be around any more.
have toyed with the idea of taking an
existing desk calculator that has large,
easy -to-use keys and interfacing it to a
large separate display. discussed the project with several persons more knowledgeable than in digital techniques, and they
hemmed and hawed about source and sink
drivers for 8 plus 1 digits, and 7 plus 1 segments with special power supplies, and
tricky ground referencing. One chap suggested looking into National's selection of
high -current driver chips that can be fed
from the multiplexed main chip.
Among your readers and contributors,
there must be someone who has encountered and tackled this sort of project. Perhaps there is an article in a magazine that
have overlooked; perhaps there is a product that has escaped me. would appreciate hearing from someone who has the
answer, or even helpful ideas. (I know
about the special "voice output" calculators that are available for the blind. So far,
they are very expensive and are obtained
through State subsidy in most cases. look
I
I
FOR THOSE WITH LIMITED VISION
A large proportion of persons called
"blind" are not totally blind; they have limited vision that may reach the extent of 5 or
10%. Many such persons can read books
and magazines with the aid of special
lamps and magnifiers. "Limited vision" is a
condition that can remain stable over many
years, and may retain its stability for life.
A friend whose vision is thus limited
asked me if could obtain a digital calculator for her-one which has digits the size of
those on her digital alarm clock. She can
see the 0.6-to -0.7 -inch digits of the clock,
but not those of the small, hand-held calculators. I checked into the features of some
so-called desk calculators and discovered
that the digit size was generally 0.25-inch
bright fluorescent or 0.375 -inch not so
bright. Years ago, there were calculators
with large bright readouts, but they don't
I
I
I
I
I
continued on page 23
Electron
Tube
Electro
Tube ,.
Electron
Tube
the Receiving Tubes you'll ever need
for most replacements.
With RCA you get the exact replacePlus many RCA service aids and busiment tubes you need along with quality
ness aids to add to your efficiency and
you can depend on. Whatever receivpromote your business ... tube cading tube you need, you'll find it at your
dies, service tools, technical literature
RCA Distributor. Miniatures, Novars,
and a wide assortment of in-store signs
Compactrons, Nuvistors, Glass Tubes,
and displays.
Metal Tubes ... over 1,000 types, proSee your RCA Distributor for all your
duced to RCA's exacting standards.
tube needs.
RCA Distributor and Special Products Division, Deptford, N.J. 08096.
RC,'
Receiving
Tubes
HICKOK LM SERIES MULTIMETERS
OBSOLETE YOUR TRUSTY OLD VOMI
Here are the truly inexpensive, ro ronsense, high
performance DVOM's you've beer loc.kinc for! Compact. Lightweight. Easy to reac, indoors or omt.
Accurate. Precise. Reliable. RJgged. Sa -e.
Self-contained. Easy to hohl anc ocera:a with the
same hand.
A complete line of inexpensive accessories is
available to extend other capabilities far beyond
those of a comparably priced VOM.
All the super -durable, high quali -y professional
meter you need for service and maintenance work at
an analog price. So why pay as mich for ana og
inaccuracy...or more for diçital f ills?
Write today for complete details or contact your
local Hickok distributor. Better y3t. call us :oil free,
outside Ohio, at 800-321-4664.
- $74
LX304 - $89
LX303
Automatic polarity, zero and overrange
indication
high L C D display
Easy -to -read '
' 2 yea- battery life in typical use
12 oz. ncluding 9V battery
Withstands 4 ft. drop without loss
of accuracy
Automatic decimal point, built in low
battery indicator, diode and transistor
testing capability (LX304 only)
Carry it in your pocket, brief case or tool
box and enjoy on -the -spot accuracy whenever and wherever you need it.
No need to worry about damage. It's built
to take it...so you can take it with you
wherever you go.
95
95
i
CIRCLE 63 ON FREE INFORMATION CARD
THE HICKOK ELECTRICAL INSTRUMENT CO.
Cleveland, Ohio 44108
10514 Dupont Avenue
TWX. 810-421-8286
(216) 541-8060
At CIE, you get
electronics
career
training
from
specialists.
If you're interested in learning how to fix air
conditioners, service cars or install heating
systems -talk to some other school. But if
you're serious about electronics, come to
CIE -The Electronics Specialists.
Special Projects Director
Cleveland Institute of Electronics
www.americanradiohistory.com
father always told me that
there were certain advantages to putting all your eggs in one
basket. "John, ' he said, "learn to
do one important thing better than
anyone else, and you'll always be
in demand."
I believe he was right. Today is
the age of specialization. And I
think that's a very good thing.
Consider doctors. You wouldn't
expect your family doctor to perform
open heart surgery or your dentist to
set a broken bone, either. Would you?
For these things, you'd want a
specialist. And you'd trust him. Because you'd know if he weren't any
good, he'd be out of business.
My
Why trust your education
and career future to
anything less than a
specialist?
You shouldn't. And you certainly
don't have to.
FACT: CIE is the largest inde-
pendent home study school in the
world that specializes exclusively
in electronics.
We have to be good at it because
we put all our eggs in one basket:
electronics. If we hadn't done a good
job, we'd have closed our doors
the exams get their Licenses. You
may already know that an FCC
License is needed for some careers
in electronics and it can be a
valuable credential anytime.
Plus there's a professional quality
oscilloscope you build and use to
"see" and "read" the characteristic
waveform patterns of electronic
equipment.
-
Find out more: Mail this
card for your FREE
CATALOG today:
You work with experi-
enced specialists.
When you send us a completed
lesson, you can be sure it will be
reviewed and graded by a trained
electronics instructor, backed by a
team of technical specialists. If you
need specialized help, you get it fast
... in writing from the faculty specialists best qualified to handle
your question.
People who have known
us a long.time, think of us
as the "FCC License
School."
We don't mind. We have a fine
record of preparing people to take ..
and pass ... the government administered FCC License exams.
In fact, in continuing surveys nearly
4 out of 5 of our graduates who take
.
If the card is gone, cut out and
mail the coupon.
I'll send you a copy of CIE's
FREE school catalog, along with a
complete package of independent
home study information.
For your convenience, I'll try to
arrange for a CIE representative to
contact you to answer any questions
you may have.
Remember, if you are serious
about learning electronics... or
building upon your present skills,
your best bet is to go with the electronics specialists- CIE. Mail the
card or coupon today or write CIE
(and mention the name and date of
this magazine ), 1776 East 17th
Street, Cleveland, Ohio 44114.
long ago.
Specialists aren't for
everyone.
I'll tell it to you straight. If you
think electronics would make a nice
hobby, check with other schools.
But if you think you have the
cool and want the training it takes
-to make sure that a sound blackout
during a prime time TV show will be
corrected in seconds then answer
this ad. You'll probably find CIE has
a course that's just right for you!
-
-
At CIE, we combine
theory and practice. You
learn the best of both.
Learning electronics is a lot
more than memorizing a laundry list
of facts about circuits and transistors. Electronics is interesting because it's based on some fairly recent
scientific discoveries. It's built on
ideas. So, look for a program that
starts with ideas and builds
on them.
That's what happens with CIE's
Auto -Programmed® Lessons. Each
lesson uses world-famous
"programmed learning" methods to
teach you important principles. You
explore them, master them completely ... before you start to
apply them!
But beyond theory, some of our
courses come fully equipped with
the electronics gear to actually let
you perform hundreds of checking,
testing and analyzing projects.
In fact,depending on the course
you take, you'll do most of the basic
things professionals do every dayeven use a Digital Learning Laboratory
to apply the digital theory essential
today to keep pace with electronics
in the eighties.
Pattern shown on oscilloscope screen is simulated.
-
SCIE
I,,
Cleveland Institute of Electronics, Inc.
1776 East 17th Street, Cleveland, Ohio 44114
Accredited Member National Home Study Council
YES... John, I want to learn from the specialists in electronics-CIE.
Send me my FREE CIE.school catalog- including details about troubleshooting
courses-plus my FREE package of home study information.
Print Name
Apt.
Address
,
,
, today:
, Mail
City
7ip
State
Age
Check box for G.I. Bill i -formation:
Phone (area code)
Veteran
LI
Active Duty
RE -s3
When quality counts
Do not be fooled by the low prices, these brand
new lab quality frequency counters have important
advantages over instruments costing much more.
The models 7010 and 8010 are not old counters repackaged but 100% new designs using the latest LSI
state-of-the-art circuitry. With only 4 IC's, our new 7010
offers a host of features including 10 Hz to 600 MHz
operation, 9 digit display, 3 gate times and more.
This outperforms units using 10-15 IC's at several
times the size and power consumption. The older
designs using many more parts increase the possiblity
of failure and complexity of troubleshooting. look
closely at our impressive specifications and note you
can buy these lab quality counters for similar or less
money than hobby quality units with TV xtal
time bases and plastic cases!
Both the new 7010 and 8010 have new amplifier
circuits with amazingly flat frequency response and
improved dynamic range. Sensitivity is excellent
and charted below for all frequencies covered by the
Quality metal cases with machine screws and heavy
guage black anodized aluminum provide RF shielding ,light weight and are rugged and attractive - not
economical plastic.
For improved resolution there are 3 gate times
on the 7010 and 8 gate times on the 8010 with rapid
display update. For example, the 10 second gate time on
either model will update the continuous display every
10.2 seconds. Some competitive counters offering a
10 second gate time may require 20 seconds
between display updates.
The 7010 and 8010 carry a 100% parts and
labor guarantee for a full year. No "limited" guarantee
here! Fast service when you need it too, 90%
cif all serviced instruments are on the way back to
the user within two business days.
We have earned a reputation for state-of-the-art
designs, quality products, fast service and honest
advertising. All of our products are manufactured and
shipped from our modern 13,000 square foot facility in
Ft. Lauderdale, Florida.
When quality counts...count on Optoelectronics.
instruments.
Both counters use a modern, no warm up, 10 MHz
TCXO [temperature compensated xtal oscillator]
time base with external clock capability - no economical
3.579545 MHz TV xtal.
MODEL 8010
1
GHz
CIRCLE 41 ON FREE INFORMATION CARD
I
MODEL 7010
600 MHz
1
1
1
1
EE sot]
I
tJ.
u
POEM le
Ú
Ì--ï
eat
w
Ú
ii JI,
nt. cu.
Mac
LI'
L -J
,
gjilk.
100% U.S.A. FACTORY ASSEMBLED
100% PARTS & LABOR YEAR GUARANTEE
CERTIFIED NBS TRACEABLE CALIBRATION
EXTERNAL CLOCK INPUT
U
7010
*7010
I25-250
to
RANGE10Hz
145.00
1
8010
8070.1
600 MHz
325.00
405.00
1
GHz
DIGIDTS
250-450 MHz
1-10 mV
9
L,I
f
10-30 mV
5-20 mV
M
1_I
-+II...III (o
.t/z
1/1 14/ao
ATr TIME / NC.
rz
40
-
sqo
,000
-
USG* -NM
New mug
LAB/PORTABLE-AC ADAPTER INCLUDED
1 MEGOHM & 50 OHM INPUTS
STATE-OF-THE-ART LSI DESIGNS
COMPREHENSIVE USER MANUAL PROVIDED
8010- 3" Hx7-'-:" Wx6-'..,"D
SENSITIVITY
50 OHM INPUT
MHz
5-20 mV
9
LI
We.,.
n
U.
1
DISPLAY HOLE FUNCTION
9 RED LED DIGITS 4" HIGH
.1 Hz RESOLUTION
0.1 PPM 10 MIS TCXO TIME BASE
225.00to
PR
1-1
oPtoelectronics inc.
oUCox
COMPACT SIZES -7010- 1-3n" Hx4-' a" Wxá-'-.1"D
MODEL
FREGUENCY COURIER
IÌ
1-Ì
LI
1.
re.
1
GM
450 MHz-1GHz
20-40 mV
600MHz
10-25 mV
HI -Z INPUT
10Hz - 60 MHz
1-10
rtI
GATE
TIMES
131
1-10 n V
12
.1.1.10 SEC
MHz
.1Hz
181,01-20 SEC
Hz
RESOLUTION
TCXO TIME BASE
60 MHz
MAX. FREO.
20 -40 C
10 Hz
600 MHz
0.1 PPM
1
1
Hz
Hz
10 Hz
1
GHz
PPM
1
1
0
1
PPM
PPM
FREO.
10
MHz
EXT
NI -CAD
CLOCK
INPUT
BATT
PACK
YES
YES
OPTION
OPTION
$15.
525.
10
MHz
YES
STD
YES
OPTION
539.
Has precision 0.1 PPM TCXO time base.
MODEL 7010
#7010 600 MHz Counter - 1 PPM TCXO
$145.00
#7010.1 600 MHz Counter - 0.1 PPM TCXO $225.00
OPTIONS
#Ni -Cad -701 Ni -Cad Battery Pack
#EC -70
#CC -70
MODEL 8010
#8010 1 GHz Counter - 1 PPM TCXO
$325.00
#8010.1 1 GHz Counter - 0.1 PPM TCXO $405.00
48010.1-13 1.3 GHz Counter - 0 1 PPM TCXO $495.00
charging circuitry
Installs inside unit
External Clock input,10 MHz
Carry Case, Padded Black Vinyl
11111
#P-100
#P-101
OPTIONS
#Ni -Cad -801 Ni -Cad Battery 'ack
&
15.00
$ 25.00
$
8.95
charging circuit y
Installs inside unit
$
#P-102
&
$
#CC -80 Carry Case. Padded Slack Vinyl $
ORDER FACTORY DIRECT
t
ACCESSORIES
#TA -100
Telescope Ant with
Right Angle BNC
$ 9.95
Probe, 50 ohm, lx $13.95
Probe, Lo -Pass.
Audio Usage
$16.95
Probe, Hi -Z,
General Purpose
$16.95
39.00
9.95
CALL TOLL FREE
Optoelectronics ìnc
5821 N.E. 14th Avenue, Fort Lauderdale., Florida 33334
1-800-327-5912
FROM FLORIDA (305) 771-2051/2
TERMS: Orders to U.S. and Canada, add 5% for shipping. handling and insurance 'o a maximum of $10.00. All other orders
add 10"
C.O.D. collection fee $1.00. Orders under $15.00 add extra $1.00 handling. Regular checks must clear before order is shipped. Florida
residents add 4% sales tax.
www.americanradiohistory.com
LETTERS
continued from page /6
Tr,rward to a future article in Radio -Electronics making use of the new voice syn-
thesizer modules.)
WESLEY H. ALDRED
Cleveland, OH
HEART RATE MONITOR
Usually, don't read Radio -Electronics,
but your July 1979 cover showing the Heart
Rate Monitor prompted me to buy that
issue. didn't build your circuit, either, but
my interest in it derives from having designed a similar circuit (digital readout) that
submitted to a design contest, and which
won me the first prize! (See EDN September 5, 1977 and EDN October 20, 1977,
page 79 for the circuit.) Since that circuit
aroused great and unexpected interest,
am passing along the following information
I
I
I
Today we have a much better source of
monochromatic light. The laser is not only
very stable, but outputs essentially only
one coherent frequency, hence makes an
excellent clock. We now have solid-state
lasers the size of a grain of sand, which we
can attach on the end of a string and swing
this monochromatic light source or stable
frequency back and forth. When the laser
swings to a detector the detector gets a
higher frequency or up Doppler as the
source travels faster than the speed of
light; but when the laser swings away from
the detector, it gets down Doppler as the
light arrives at the detector at less than the
speed of light. Only at the extremes of
swings does the detector get the same frequency as the laser always outputs. How?
Because the speed of light is a constant
only to the source and may not be a constant to all observers.
It has been 58 years since Einstein won
the Nobel prize for the photoelectric effect.
As yet, no one has ever even found one
photon, let alone measure its velocity, as
Dr. Mark implies is an easy thing to do. If
Einstein had had precision -tuned electronic circuits, as most Radio -Electronics
readers have, he could have explained the
photoelectric effect with them. Each different atom represents a sharply tuned circuit
of a different frequency, and will only emit
electrons when it absorbs its own particular
frequency to get sufficiently excited. Look
up "postulate" in the dictionary. Einstein's
R -E
math is not science.
JOHN W. ECK LIN
Alexandria, VA
I
to your readers:
The only criticism have of M. C. Worley's circuit is the rather slow response time
(6+ seconds) because of the output filter.
Also, the physical size of the circuit could
be reduced by using a quad op -amp
(LM324) in place of ICI and IC4; in addition,
that allows low voltage and a single supply
(battery) operation. IC2 and IC3 might also
be replaced by a 556 dual timer. IC5, 03,
and the speaker can also be simplified to
one "Sonalert" beeper. A comparator with
histeresis in front of Q1 also greatly improves noise (muscular, etc.) immunity.
My circuit updates the rate at every pulse
using frequency multiplication with F/V, V/
F converters, runs on one 9 -volt battery,
and has digital LCD display-all for less
than $60. The sensor use is a Monsanto
MCA -7 ($3.95).
Since the originally published circuit
turned out to have some problems, developed an improved version obtaining f=1/t
by analog division.
A copy can be obtained from Intech
Function Modules (the sponsor of the contest), 282 Brokaw Road, Santa Clara, CA
95050 or directly from me. Good luck.
GERO TIMMERMANN
Muttitech, P.O. Box 2277, Santiago, Chile
I
I
I
WORE
NOT CONFUSED ABOUT EINSTEIN
may be careless, but am not confused
about "Einstein's Theory," as Dr. Mark
suggests in his letter in the October 1979
issue. My letter in the June 1979 issue
should have stressed the stability of the
mobile radar transmitter, so that without
measuring we know its transmitted wavelength and frequency never changes no
matter how the police car maneuvers. Thus
"simultaneity" is no longer a problem, as
we know the frequency at the source is stable without measuring it again at each
observer where it changes, except where
there is no Doppler or radial motion.
How is the "famed" Michelson-Morley
experiment even involved with photons and
relativity? That experiment used monochromatic light as a source, which is light of
one frequency or very stable. That monochromatic light source was solid to the
same Earth as the lenses and mirrors in the
interferometer, so there was no relative
motion, which is all and precisely what the
Michelson-Morley experiment measured
and proved.
I
I
...your
Sprague distributor.
Sprague distributors have MORE to offer ... more component types,
more styles, more ratings, more sizes, more quality, more value. With
Sprague distributors, you save time by getting what you want when you
want it, faster and easier.
For the name of your nearest Sprague distributor and a copy of Catalog
C-622, write to:
Sprague Products Company
ES -913
Distributors' Division of the Sprague Electric Co.
81 Marshall Street
SPRAGUE
North Adams, Mass. 01247.
Where MORE is more than a promise.
CIRCLE 17 ON FREE INFORMATION CARD
THE
a
MARIE OF RELIABILITY
subsid ary of OK
Technologies
Radio Shack Road Patrol
Radar Detector
CIRCLE 101 ON FREE INFORMATION CARD
RADAR SPEED DETECTORS STILL SEEM TO BE
hot -selling items judging from the continuing
production of these little devices by the electronics industry.
One of the newest designs is the Road
Patrol L.R. recently released from Radio
Shack. Made for Radio Shack by a prominent
manufacturer, the Road Patrol multiband detector is designed to respond to either X -or
K -band signals. As with other similar devices,
the Road Patrol extracts power from the cigarette lighter receptacle. A retractible coil cord
keeps the power line snug. A universal mounting bracket is furnished with the detector,
allowing for a variety of mounting schemes. A
self -adhering pad (supplied) may be used to
stick the detector and bracket assembly firmly
to the windshield for greatest clearance. Alternately, the bracket may be stuck or screwed
down to the top of the dash or to the hardware
seal around the windshield. A set of adjustable
screws permit the unit to be optimally tilted on
its mount so that it faces directly forward for
maximum range.
The housing is plastic with a non -glare
rough black texture. There are two electronic
adjustments, accessible from the front. The
volume of the audible alarm may be set so that
any triggering may be heard above ambient
vehicle noise. A sensitivity control provides an
approximate range -distance selection.
Accompanying the audible alarm, a flashing
red panel light displays the warning, CHECK
when the detector is triggered.
If it is likely that the owner would like to
transfer the detector repeatedly between vehicles, extra mounting brackets are available at
additional cost from Radio Shack.
A green LED pilot light indicates when the
unit has been switched on. When first powered
up, the unit will "beep" and flash the alarm
light for a short stabilization period. After
that, the unit may be adjusted for optimum
performance.
In a major metropolitan area, there are
many stray RF signals which may cause false
triggering of the sensitive device. That susceptibility is common to virtually all broadband
Radar detectors; it is a fact of life. Fortunately,
such false indications are usually erratic and
are also short-lived.
When the Road Patrol detects an actual
speed radar transmission, the audible pulsating
tone and flashing red alarm light will recur
repeatedly. That signal is unmistakable when
compared to the occasional signals.
SPEED,
How it works.
A radar detector is simply a broadband,
high -sensitivity RF-level detector. It has a
RCA's 1980
SK Guide puts
Sylvania ECG*
in its place.
You'll find the comparable ECG
number right along with the SK
number for the second year in a
row in RCA's new SK Solid State
Replacement Guide.
This is it...
www.americanradiohistory.com
1
tuned microwave horn antenna that is designed
to pass signals in the X -and K -(several thousand megahertz) bands into a diode. The
radio-frequency energy is then rectified into a
voltage that upsets a delicately balanced alarm
circuit. Obviously, a radar speed trap cannot be
detected unless the radar is actually transmitting a signal. That is one way that law enforcement agencies can outwit the detectors: They
may use short bursts of radar to monitor specific vehicles momentarily-hardly enough
time for a radar detector to resolve whether the
incoming signal is a random bit of RF interference, or whether it actually is a transmitted
radar signal.
The range of a radar detector depends on a
number of factors including its own sensitivity,
the power -output level of the radar transmitter, the terrain on which the transmitter is
being used, the amount of surrounding traffic,
and the weather.
We were able to test the Road Patrol over a
recent holiday weekend. On a trip to a local
hamfest, we entered the city limits of Knoxville, Tennessee, and the little detector began
to beep persistently. We couldn't turn the sensitivity low enough to keep it from frantically
trying to tell us something. Instinctively, we
slowed down, and looked analytically at the
bushes, trees, grass-anything and everything.
After about a half mile of super -cautious driving, there it was: an airport radar dish, sweeping the horizon!
Our return trip was more productive. A
series of radar traffic -control points were definitely in operation in Western North Carolina,
and the Road Patrol let us know every time we
came near one with plenty of time to spare so
we could slow down.
a
,
Are they legal?
The battle in the courtrooms still looms.
Some recent landmark decisions have ruled in
favor of the driver. Is the mere possession of a
radio -receiving device proof that the owner is
guilty of trying to evade the law? That this
question is difficult to answer.
Some police agencies have attempted to
locate strategically old radar transmitters that
will produce false signals on major highways,
causing detector owners to lose faith in the
judgment of their detector devices. That action
has been recently struck down by the FCC
because of the interference the transmitters
generate on the airwaves.
So far, only one technique has been proven
100% effective for avoiding speeding tickets:
Just stay under 55 miles per hour! The Radio
Shack Road Patrol radar Detector sells for
R -E
$199.95.
Rotable TV RCA Mini-State
Antenna
WE ARE LIVING IN AN AGE OF RAPIDLY INCREAS-
ing miniaturization. Watches, calculators,
computers, and automobiles all reflect the
trend. Now, RCA has joined the ranks of the
miniaturizers with their new Mini -State compact UHF/VHF TV antenna.
Looking like a flying saucer, the 5MS440
Mini -State is mqunted as high as possible,
away from metallic masses. Internally, the 21 inch plastic housing encloses a motor -driven
directional antenna array. A circular styrofoam
form provides support for a UHF Yagi and a
terminated, tuned VHF loop. The VHF loop is
continued on page 26
Free!
Edmund Scientific
Catalog
Explore Astronomy, Biofeedback,
Optics, Lasers, Magnets, Weather,
Magnifiers, Microscopes, PhotoOver 4,000 Fascinating
graphy
Products in Our FREE 100 page color
Catalog! Send for your FREE
Edmund Scientific Catalog, Today!
38 Years Of Service!
...
D Yes! Rush me your FREE
Name
Address
City
State
catalog!
Zip
Clip and Mail Coupon Today to:
Edmund Scientific Co, Dept. 2020, EHO6
Edscorp Bldg., Barrington, N.J. 08007
No. 156 ©1980 Edmund Scientific Co.
one SK book- all you need
to fill your solid state
replacement needs.
DUAL NUMBERING SYSTEM
e.g. SK3444/123A
EVERYTHING UNDER ONE COVER
PUBLISHED EARLIER THAN EVER
1,080 SK AND KH TYPES REPLACE
MORE THAN 161,000 DOMESTIC
AND FOREIGN TYPES
MAKE MRO REPLACEMENTS RIGHT
FROM YOUR SHELF
RCA SK's are all manufactured by RCA's Solid State
Division or by reputable original solid state device
manufacturers. This means built-in quality and fewer
costly call-backs for you. Your profit picture gets
brighter and brighter with RCA SK's ... transistors,
rectifiers, thyristors, integrated circuits and high -
voltage triplers.
See your RCA SK distributor for a copy of the 1980
RCA SK Replacement Guide, SPG 202Y orsend your
request with check or money order for $1.50 to RCA
Distributor and Special Products, P.O. Box 597,
Woodbury, N.J. 08096.
SK Replacement
Solid State
'ECG is
a
trademark of GTE Sylvania
25
amplified by a single -transistor integral preamplifier, while the UHF signal is coupled directly to the downlead.
RCA supplies a 60 -foot length of prefabricated coaxial/control cable. The RG -59 coaxial cable is terminated at each end with an Ftype connector, compatible for hookup both to
the antenna and the power -supply unit below.
The three -wire control cable is connected to
screw terminals for motor drive control.
Assembly is easy. A screwdriver locks down
the control cable leads, and the prewired coaxial cable screws on to the F connectors. Directions are excellent and easy to follow.
The manufacturer suggests that the radome
be mounted as high as possible, free and clear
of metallic obstructions. That is always a good
practice for any antenna.
The rotable system is activated by a hand-
held remote -control unit. Colorful backlighted compass points are illuminated successively as the thumb control is depressed, signalling that the internal antenna is being
rotated through its azimuth.
Mounting is provided by a stainless steel
mast -mounting bracket. A set of spider legs is
also included for setting the radome on a flat
surface such as a closet shelf or attic floor.
Optional accessories available include a variety of mounting masts. An offset pipe facilitates the otherwise awkward case of side
mounting on a wall. A rod -mounting tripod is
also available.
The antenna system is powered from 120
VAC. A dual power model (includes 12 VDC)
is available as the 5MS550. It is useful for
portable applications, such as recreational vehicles and boats. Aside from the power sup-
plies, the two systems are identical.
Excellent literature accompanies the Mini-
State antenna system. The owner's manual
includes a complete circuit diagram, as well as
a supply of operational and installation hints.
CIRCLE 102 ON FREE INFORMATION CARD
We Started With A Great Idea
Then Made It 10 Times Greater
r¡
.
4' _"
No. 424
No. 426
..
No. 420
=----...
r
..
,
:
9'2"
No 422
ir.111MK:
/"
:
61/2"
,,,,,,
9'2"
.....---
oloi reer.
No 442
i311111mu.ö
-.-*+
12"
o.
.1,1,14:181,H".12"
No. 460G
We originated the tongue and groove plier. Improved it
with patented undercut mating parts that can't slip.
Improved it again with the patented reinforcing flange
that minimizes stress breakage. Meanwhile, we developed ten sizes and styles to satisfy a wide range of
needs.Reasons why the first of its kind is best of its kind.
CHANNELLOCK. Be sure that name is on the handle.
CHANNELLOCK, INC.
430- 10"
Meadville, Pennsylvania 16335
CHAN NEL LOCK
Meet The Rest Of The Family. Send For Free Catalog.
CIRCLE 29 ON FREE INFORMATION CARD
16"
We compared the Mini-State to a roof mounted Radio Shack V-110 log periodic
dipole array. Both antennas were clear of surrounding obstructions, even though the MiniState was mounted about four feet higher than
the V-110.
Geographically, the test area was deep
fringe. Since the Mini -State is advertised as
useful in metropolitan and near suburban
applications, we didn't expect it to perform as
well as the large log -periodic under such conditions. Sure enough, it didn't! Stations were still
visible in most cases, but they were way down
in the snow. It was really an unfair comparison
considering the capture area and gain of the
log periodic.
Would we recommend the Mini -State! Yes,
under certain circumstances. Unquestionably,
when space is a problem, the Mini -State is
better than rabbit ears. Also, its ability to be
rotated is an advantage. On almost every channel, the sharp, unidirectional property of the
unit was obvious. In urban applications where
signal reflections, ghosts, and co-channel interference may be a problem, the rotating directability will be very useful.
Also, the Mini-State would find excellent
application anywhere that signal strengths
from nearby TV transmitters are sufficiently
high that enormous antenna gain is not a consideration. Pleasure boats docked or being
piloted in waters near major metropolitan areas
would be a logical application of such a compact TV antenna system. The additional feature of rotability makes the antenna even more
desirable for such mobile applications.
Similarly, people with recreational vehicles
parked near urban areas where there is still
some reasonable level of television signals present will find the Mini-State a good investment. The low profile of the antenna makes it
particularly suitable for mobile installations
where other types of projecting antennas
would be a hazard. In the majority of cases, the
antenna would not have to be removed as
would other types of electrically equivalent
antenna installations.
If the TV set is being operated by 120 VAC
power, the regular 5MS440 may be powered
from the same source. In mobile applications
where 12 volts is powering the TV set, the
5MS550 dual -powered Mini-State should be
considered. The model 5MS440 Mini -State
compact TV antenna has a recommended retail
price of $89.95.
R -E
continued on page 30
341 WAYS TO INCREASE YOUR
ELECTRONICS KNOW-HOW!
I
SEND NO MONEY! We'll Invoice you on 10 -DAY FREE TRIAL.
ALL BOOKS 100', GUARANTEED. You must be satisfied
or return the books and we'll cancel the invoice.
'COMPUTERS. MICROPROCESSORS
& ROBOTICS
$9.95
$7.95
$9.95
$5.95
1050-Most Popular Subroutines in BASIC 182 p., 349 il.
$5.95
1045-Programmer's Guide to LISP 210 p., 133 il.
1241 -How To Build Your Own Self-Programming Robot 238 p. $7.95
$7.95
1062 -The A to Z Book of Computer Games 308 p., 73 I.
1111 -Design, Build, Prog. Your Own Working Computer System$8.95
$5.95
'1053-Microprocessor Cookbook 266 p., 124 il.
1141 -How To Build Your Own Working Robot Pet 238 p., 86 il. $6.95
$2.95
'1107-Computerist's Handy Manual 64 p., 39
$3.95
1069-Computerists Handy Databook/Dictionary 96 p. 42 I.
57.95
I1071 -The Complete Handbook of Robotics 364 p. t37 it
1085-24 Tested, Ready -To-Run Game Programs in BASIC 252 p. $6.95
$8.95
g1070-Digital Interfacing with an Analog World 406 p. 277 I.
1088 -Illustrated Diet. of Microcomputer Terminology 322 p., 150 ií.$7.95
$7.95
1076 -Artificial Intelligence 252 p. 118 it
$5.95
841 -Budd Your Own Working Robot 238 p., 117 il.
1099-How To Build Your Own Working 16 -Bit Microcomputer 80p.53519955
I1095 -Programs in BASIC for Elec. Eng., Techs., 8 Exp. 140 p. $4.95
1077-Hdbk. of Remote Control & Automation Techs. 294 p., 250 ií.$7.95
'1055 -The BASIC Cookbook 140 p., 49 il.
$4.95
1015--Beginner's Gde. to Computers & Microprocessors 308 p. $6.95
$7.95
11000-57 Practical Programs & Games in BASIC 210 p. 64 il.
$5.95
995 -Beginner's Guide to Microprocessors 182 p. 106 il.
$6.95
985 -Programming Microprocessors 208 p. 102 il.
676-Simplified Computer Programming -Including RPG 240 p. $6.95
$5.95
971-Miniprocessors: from Calculators to Computers 196 p.
874 -Master Handbook of Digital Logic Applic's. 392 p. 287 il. $7.95
952-M/processor Programming for Computer Hobbyists 387 p. $8.95
$6
955 -Modern Digital Communications 308 p. 122 0.
853-Piloting/Navigation With the Pocket Calculator; 406 p., 33811. $8.9595
975 -The "Compulator" Book -Build Super Calculators & Mini57.95
computer Hdwe. with Calculator Chips 322 p 227 0
$9.95
752 --Computer Programming Handbook 518 p. 114 il.
$10.95
554-Computer Technician's Handbook 480 P. 428 il.
824-Advanced Applications for Pocket Calculators 304 p. 27511. $5.95
$5.95
538-Computer Circuits & How They Work 192 p. 109 il.
574-Beginner's Guide to Computer Programming 480 p. 364 d.$9.95
$6.95
785-Microprocessor/Microprogramming Hdbk 294 p. 176 il.
$7.95
709-Modern Guide to Digital Logic 294 p. 222 0.
54.95
724-Get the Most Out of Electronic Calculators 204 p. 28 il.
$5.95
549-8 inner's Guide to Computer Logic 192 p. 17511.
1169 -GIANT Handbook of Computer Projects 504 p. 217 ill
11160-1001 Things to do With Your Personal Computer 336
1201
o
1
,
1
1
1
,
,
111
-Complete Microcomputer Systems Hdbk. 322 p., 125
CIRCUITS BOOKS. HOBBY ELECTRONICS
&
p.
il.
PROJECTS
$9.95
1199 -The Master IC Cookbook 476 p., 707 il.
1137-First Book of Electronic Projects 64 p., 55 0.
$3.50
$1295
1184-Master Guide to Electronic Circuits 616 p., 302 0.
$5.95
1168-How to Repair Clocks 182 p., 90 il.
$6.95
I1123 -The Laser Experimenter's Handbook 210 p., 187 il.
55.95
1118-Making & Using Electricity From the Sun 144 s.
$7.95
881-666 Science Tricks & Experiments 406 p., 386 il.
$4.95
I1142-84 Practical IC Projects You Can Build 140 p., 113 il.
805-99 Test Equipment Projects You Can Build 378 p., 337 0. $7.95
$12.95
804 -Master Hdbk of 1001 MORE Practical Electronic Circ.
1105 -How To Cast Small Metal & Rubber Parts 144 p., 132 a. $5.95
1101 -How To Design & Build Your Own Custom TV Games 546 p $9.95
$7.95
806 -The Power Supply Handbook 420 p. 292 il.
1108 -Lasers, The Light Fantastic 294 p. 158 0.
$6.95
1079-How to Budd & Use Low-Cost Hydrophones 140 p. 98 d. $4.95
1113-Understanding Electronics 182 p. 265 d.
$4.95
800 -Master Hdbk. of 1001 Practical Electronic Circuits 602 p. 512,95
$6.95
1060-303 Dynamo Electronic Circuits 308 p.. 303 il.
$4.95
1023 -Beginner's Guide to Designing /Bldg. Transistor Radios
$2.50
965-Modern Transistor Radios 64 p., 112 il.
958-Beginner's Guide to Making Electr. Gadgets 140 p. 113 d. $4.95
$4.95
921 -The ABC Book of Hi-Fi/Audio Projects 168 p. 131 it
$3.95
909-How to Build Metal/Treasure Locators 140 p. 60 il.
$5.95
935 -Budd -lt Book of Optoelectronic Projects 238 p. 175 il.
964-Modern Crystal Radios (Make and Use Series) 64 p. 101 il. $2.50
$3.95
637-Fun with Electronics 140 p. 50 il.
$5.95
836-Optoelectronics Guidebook -with Projects 196 p. 115 il.
905-Build -It Book of Digital Electronic Timepieces 294 p. 209 il. $6.95
$5.95
926-Model Railroad Electronics 308 p. 218 it
912-88 Practical Op Amp Circuits You Can Budd 140 p. 120 il. $4.95
868-CBer's Handybook of Simple Hobby Prolects168 p. 114 11. $3.95
$5.95
887-106 Easy Electr. Projects -beyond the transistor 224 p.
790-21 Simple Transistor Radios You Can Build 140 p. 122 il. $3.95
$5.95
861 -Display Electronics 252 p 195 it
$5.95
771 -Integrated Circuits Guidebook 196 p. 119 il.
706 -Indexed Guide to Modern Electronic Circuits 216 p. 92 0. $4.95
$695
787-OP AMP Circuit Design & Applications 280 p. 239 a.
796-MOSFET Circuits Guidebook -with 100 Projects 322 p. 1960 $5.95
$5.95
714-Radio Astronomy for the Amateur 252 p. 88 il.
192
214
d.
$6.95
p.
571 -Radio Electronics Hobby Projects
$4.95
591 -Solid State Projects for the Experimenter 224 p. 228 0.
$5.95
780-111 Digital & Linear IC Projects 210 p. 244 /,
$5.95
699-Solid State Circuits Guidebook 252 p. 227 il.
$5.95
629 -Handbook of IC Circuit Projects 224 p. 136 il.
$4.95
487-64 Hobby Projects for Home & Car 192 p. 195 11.
$4 95
537-125 One-Transistor Projects 192 p. 125 il.
$3.95
83 -Fun with Electricity 128 p. 94 0.
192
p.
100
0.
Principles
&
Projects
$4.95
647-Stereo/Quad Hi-Fi
$4.95
464 -Electronic Hobbyist's IC Project Handbook 154 p. 86 il.
$4.95
613-New IC FET Principles 8 Projects 154 p. 60 il.
462-104 Easy Transistor Projects You Can Build 224 p. 105 0 $7.95
176
127
il.
$3.95
&
Projects
p.
590 -Practical Solid -State Principles
$5.95
568 -IC Projects for Amateur & Experimenter 192 p. 252 il.
542 -Transistor Projects for Hobbyists & Students 192 p. 153 d $4.95
53.95
70 -Electronic Puzzles & Games 128 p. 75 0.
BASIC
&
GENERAL ELECTRONICS TECHNOLOGY
$14.95
il1066 -Illustrated Dictionary of Electronics 882 p., 472 il.
$6.95
510-How to Read Electronic Circuit Diagrams 192 p. 140 11.
$9.95
588-Basic Electronics Course 384 p. 275 1.
$5.95
882 -Transistor Ignition Systems 252 p. 162 d.
$5.95
749 -Auto Electronics Simplified 256 p., 202 d.
$5.95
748 -The Complete Auto Electric Handbook 210 p.. 139 il.
$6.95
891 -Practical Solid -State DC Power Supplies 196 p. 151 ti.
191
0.
$6.95
628 -Basic Electricity & Beginning Electronics 252 p.
$7.95
830 -Introduction to Medical Electronics 320 p. 126 il.
$11.95
655 -Modern Electronics Math 686 p. 424 il.
$4.95
728 -Basic Digital Electronics 210 p. 117 il.
$5.95
691 -Electronics Unraveled 228 p. 96 il.
$6.95
828-Switching Regulators & Power Supplies 252 p. 128 il.
583-Industrial Electronics: Principles & Practice 416 p. 380 0. $8.95
930-Servicing Medical & Bioelectronic Equipment 350 p. 165 ií.$8.95
$9.95
601 -Basic Color Television Course 420 p. over 300 0.
$5.
104 -Basic Radio Course 224 p. 128 11.
$4.9595
111
638 -Manna Electronics Handbook 192 p. 106 0.
$5.95
528 -Pulse & Switching Circuits 256 p. 184 il.
19t
d.
$5.95
585 -Digital Electronics: Principles & Practice 292 p.
$5.95
105 -Basic TV Course 224 p. 128 il.
$7.95
111 -Basic Transistor Course 224 p. 179 il,
New Commonsense Approach$6.95
791 -Mathematics Unraveled
-A
mminmsmm gm mmmm gas mum
I.......
AUDIO. RECORDING. HI-FI
&
IIMUMMBilMffliMIMMIIIIIII
STEREO
1234-21 Custom Speaker Enclosures You Can Build 240 p.,1770. $7.95
1206 -How to Design & Build Digital Audio Amplifiers 350 p., 249 il.
1167 -Electronic Music Synthesizers 168 p.. 127 il.
1034 -How To Select & Install Your Own Speakers 238 p.. 131 il.
1166 -Build a Small Budget Recording Studio From Scratch
867 -Electrical Hdbk for RVs, Campers, Vans. Boats. Trailers
1001 -Master Handbook of Still & Movie Titling for Amateur & Pro
1011 -How To Repair Movie & Slide Projectors 304 p.. 270 il.
911 -Restoring & Collecting Antique Reed Organs 320 p., 124 il.
1064-How to Design/Build/Test Complete Speaker Systems 336 p.
$9.95
55.95
$5.95
$8.95
$3.95
$9.95
$7.95
$8.95
$7.95
364p.
$7.95
in
Cars/Boats/Planes/Trucks
1056 -Install Everything Electr.
1042
Radio, Record/Tape Player Schem Manual -V. 2 200 p.$7.95
1017 -Understanding Sound. Video & Film Recording 140 p., 74 il. $5.95
966 -Complete Handbook of P A Sound Systems 272 p., 148 i1.$7.95
681 -Questions & Answers on Tape Recording 264 p.. 102 0. $5.95
$8.95
610 -How to Repair Musical Amplifiers 288 p., 50 il.
$5.95
736 -Amateur Filmmaker's Hdbk Sound Sync/Scoring 210 p.
875 -Microphones -How Work & How to Use Them 224 p. 92 n. $6.95
168
0.
$6.95
46 -Acoustic Techniques for Home & Studio 224 p.
$8.95
781 -Handbook of Multichannel Recording 322 p. 196 0.
$7.95
934 -Photo Guide to AM/FM Stereo Repair 288 p. 281 il.
0.
54.95
252
p.102
to
Sound
-From
Source
756
-Channel Stereo
$495
634-Basic Audio Systems 240 p. 203 0.
$6.95
1931 -Produce Exciting Slide Shows & Movies With Sound
$89-Cassese Tape Recorders -How Work/Care/Repair 204 p. $5.95
171
il.
$5.95
224
p.
497-Tape Recording for Fun & Profit
681 -Questions & Answers About Tape Recording 264 p. 102 il. $5.95
716-Servicing Cassette & Cartridge Tape Players 294 p. 196 il. 56.95
505-Installing & Servicing Home Audio Systems 256 p. 136 il. $5.95
54.95
67-Elements of Tape Recorder Circuits 224 p. 145 0.
642 -lap Radio, Record 8 Tape Player Service Manual 228 p. $6.95
55.95
59 -Servicing Record Changers 224 p. 173 il.
-lap
HAM RADIO. CB.COMMUNICATIONS
&
TELEPHONES
$9.95
1194 -How to Repair Amateur Radio Equipment 448 p.. 385 il.
1152 -Antenna Data Reference Manual-mot dimension tables $7.95
$4.95
1120-OSCAR: The Ham Radio Satellites 128 p.. 95 il.
802-The Giant Book of Amateur Radix Antennas 462 p., 255 il. $8.95
$3.50
999-How to Hear & Speak CB In a Short -Short 176 p.
$4.95
665-Mobile Radio Handbook 192 p., 175 il.
54.95
1097-All About Telephones 192 p. 140 0.
$2.25
1052-Radar Detector Handy Manual 80 p.. 63 il.
238
p
55.95
1054 -Antenna Construction Hdbk. for Ham, CB & SWL
I005-Hdbk of Solar Flare Monitonng & Prop. Forecasting 196 p.56.95
997 -The Handbook of Telephones & Accessories 432 p. 215 11,59.95
$2.50
969-CBer's Handy Manual of Base Stations 96 p. 55 il.
$8.95
801 -Master Handbook of Ham Radio Circuits 392 p., 301 d.
$5.95
963 -Home -Brew HF/VHF Antenna Handbook 210 p. 143 il.
$2.25
959-CBer's Handy Manual of SSB 80 p. 42 il.
665--The Complete Shortwave Listener's Handbook 288 p. 101 11.56.95
683-Pictorial Guide to CB Radio Install./Repair 256 p. 304 il. $5.95
673-How to Be A Ham-Incls. Latest FCC Rules 192 p. 25 il. $3.95
950-III Diet. of Broadcast-CATV-Telecomms. 420 p. 104 il. $8.95
$5.95
799 -CB Radio Operators Guide-2nd Edition 256 p. 139 il.
$1.50
899-CBer's Handy Manual 48 p.
735-The Complete FM 2 -Way Radio Handbook 294 p. 111 il. $6.95
859-The Complete Handbook of Slow -Scan TV 304 p. 169 il. $9.95
169
il.
Repair
406
p.
$7.95
Troubleshooting
&
954-Practical CB Radio
$6.95
597-RTTY Handbook 320 p. 230 i1.
$1.95
933-CBer's Handy Atlas/Dictionary 64 p.
722-Amateur FM Conversion & Const. Projects 276 p. 187 il. $5.95
171
il.
276
p.
517,95
678-Modern Communications Switching Systems
$5.95
581 -Citizens Band Radio Service Manual 228 p. 84 il.
621 -The 2-Meter FM Repeater Circuits Handbook 312 p. 194 il. $6.95
ELECTRONIC TEST EQUIPMENT
1177 -Practical T'shtg. with Modern Test Instruments 304 p., 288 il. $7.95
$7.95
1162 -Practical T'shtg. with Modern Scopes 288 p., 267 il.
$3.95
132 -How to Test Almost Everything Electronic 160 p. 144 il.
730-Effective Troubleshooting with EVM/Scope 238 p.. 185 0. $5.95
1012-How To Design /Build Electr. Instrumentation 420 p. 210 0. $9.95
792-Build -It Book of Miniature Test & Msmt. Instr. 238 p 151 O. $4.95
$4.95
472-Working with the Oscilloscope 104 p 183 il. 7" x 91/4"
$5.95
672-Understanding & Using the VOM & EVM 192 p. 187 il.
$5.95
927-How to Use AF & RF Signal Generators 238 p. 162 il.
$4.95
702-Electronic Measurements Simplified 240 p. 217 il.
How To Use It 204 0.. 174 ií.$4.95
723-Electronic Test Equipment
729 -RF & Digital Test Equipment You Can Build 252 p. 217 il. $5.95
877-Under. & Using Modern Signal Generators 294 p. 120 il. $6.95
$5.95
664-Understanding & Using the Oscilloscope 272 p. 170 il.
$5.95
577-How to Use Color TV Test Instruments 256 p. 230 il.
$4.95
131 -Test Instruments for Electronics 192 p 155 il.
680 -How to T'shoot & Repair Electr. Test Eqpt. 252 p. 143 il. $6.95
-8
777-Under./Using Modern Electr./Svclng./Test Equipment 252 p.55.95
$5.95
to Use Your Oscilloscope 192 p. 327 il.
485 -How to Use Test Instr. in Electronics Servicing 256 p. 234 il. $4.95
483-99 Ways
ELECTRONICS ENGINEERING
&
REFERENCE
$6.95
1133 -The Active Finer Handbook 280 0. 251 d.
1132-Hdbk of Electrical Noise: Measurement and Technology $6.95
1038 -Electronic Designer's Handbook -3rd Edition 350 0., 278 il. $9.95
$4.95
1087 -How to Repair Briggs & Stratton Engines 182 p.. 135 il.
1035 -Instrumentation & Control Sys. Eng. Hdbk. 434 p. 184 il. $1995
$8.95
929 -Solid-State Motor Controls 322 p., 162 il.
742 -Prof. Electrical/Electr. Engr's License Study Guide 476 p. 5795
750 -Electronic Conversions, Symbols & Formulas 224 p. 46 il. $5.95
$5.95
829 -Impedance 196 p. 90 il.
5695
774-Digital/Logic Electronics Hdbook 308 p. 226 il.
$5.95
118 -Electronics Data Handbook 256 p. 149 il.
FCC LICENSE STUDY GUIDES
1073 -Amateur Rad. Lrc. Sty. Gde. for Nov. Tech & Gen. Class $6.95
1092 -First Class Commercial FCC Lic. Study Guide 392 p. 205 0.57.95
$8.95
582 -Commercial FCC License Handbook 444 p. 150 il.
652 -2nd Class FCC Encyclopedia Study Guide 602 p. 600 0. 57.95
$695
893 -Third Class FCC License Study Guide 322 p. 88 il.
873 -Ham Radio Novice Class License Study Guide 224 p. 57 il. $5.95
$5.95,
1138 -Buyer's Guide to E'thing Electronic for the Home 224 p.
$7.95
1196 -Adding Solar Heat to your Home 280 p.. 185 il.
1163 -Complete Hdbk. of Sewing Machine Repair 308 p., 240 il. $8.95
$7.95
1081 -Build Your own Log Cabin from Scratch 350 p., 239 il.
968-How to Convert Your Car or Van to Diesel 210 p.. 166 il. $6.95
$7.95
1140 -Basic Gunsmithing 288 p.. 152 il.
925-Practical Electrical Installation, Repair & Rewiring 406 p. $7.95
$5.95,
1178-How To Make Your Own Solar Electricity 68 p., 87 il.
1020-Auto Air Conditioning Handbook-Install. Maint. & Repair $6.95
1176 -The Master Handbk of ALL Home Heating Systems 352 p.$7.95,
$8.95
631 -Aviation Electronics Handbook 406 p., 227 ìl.
1128 -Make Home Electricity From Wind, Water & Sunshine
1019 -The Master Handbook of Electrical Wiring 406 p.. 289 il. $6.95
1036 -Cut Your Electric Bill, Install Your Own Emerg. Power Sys.
1063 -How To Install Your Own Home or Mobile Ele. Power Plant $5.95
931 -Direct Current Motors 252 p. 170 il.
$7.95
817 -How to Repair Diesel Engines 308 p., 237 il.
604-Using Electronic Testers for Auto Tuneup 252 p., 226 il.
$8.95
987 -Hearing Aid Handbook 336 p. 224 il.
913--Complete Hdbk. of Electrical & House Wiring 476 p. 193 il. $6.95
906-Homeowner's Gde. to Solar Heating/Cooling 196 p. 113 il.
$9.95
962 -Microwave Oven Service & Repair 420 p 210 il.
903-Guide to Modern Energy -Efficient Heating/Cooling Sys.
$5.95
758 -How to Completely Secure Your Home 224 p. 162 il.
1030-101 Practical Uses for Propane Torches 140 p. 98 il.
$495
1006-Build -It Book of Seder Heating Projects 196 p. 111 il.
820-Central Heating/Air Cond. Repair Guide 320 p. 285 il.
$6.95
T-97-Electrc Motor Test & Repair 160 p. 102 il.
515-Small Appliance Repair Guide-Vol. 1 224 p. 100 il.
$7.95
917 -How to Repair Small Gasoline Engines 392 p. 251 il.
$5.95
904-Homeowner's Guide to Saving Energy 288 p. 183 il.
$4.95
745-The Home Appliance Clinic 196 p. 61 il.
$5.95
885 -How to Repair Home Kitchen Appliances 294 p. 205 il.
920-Complete Hdbk. of Locks & Locksmithing 392 p. 200 il.
$5.95
855 -How to Repair Home Laundry Appliances 280 p. 137 il.
715 -Small Appliance Repair Guide-Vol. 2 210 p. 119 if.
$5.95
555 -Major Appliance Repair Guide 288 p. 278 il.
671 -Electrical Wring & Lighting for Home&Olfice 204 p. 155 il.
520 -How to Repair Home & Auto Air Conditioners 208 p. 100 il. $5.95
53.95
295-Refrieration 160 53 il.
1
$5.95,
52.95,
$14.95,
$4.95,
$4.95,
$5.95,
$3.95,
$6.95,
$5.95,
,
$6.95,
$4.95,
$4.95,
743 -Electronic Music Circuit Guidebook 252 p. 180 il.
843-Sourcebook of Electronic Organ Circuits 168 p. 101
718 -Electronic Music Production 156 p 79 il.
546-Electronic Musical Instruments 192 p. 121 il.
832 -Electronic Musical Instr. Manual 210 p. 7" o 10" 385
503 -Servicing Electronic Organs 196 p.
x 11" 145
$3.95,
55.95
$6.95,
$9.95
$7.95
1013 -Beginner's Guide to TV Repair -2nd Edition 224 p., 56 il. $5.95
$6.95
1082 -TV Field & Bench Servicer's Handbook 208 p. 165 il.
1119 -Color TV Trouble Factbook-4th Edition 434 p., 100's of il. $7.95,
$7.95
1028 -How To Repair Video Games 270 p.. 182 il.
$9.95 11
939-Hdbk of Marine Electronic & Electrical Systems 546 p.
$9.95
901 -CET License Handbook -2nd Edition 448 p. 381 il.
821 -TV Troubleshooter's Handbook -3rd Ed. 448 p. over 300 il. $4.95,
$5.95
956-Fire & Theft Security Systems -2nd Ed. 192 p. 108 il.
876-Cola TV Case Histories Illustrated -Vol. 2 352 p. 243 il. $7.95
$5.95
746-Color TV Case Histories Illustrated 238 p. 219 il.
$4.95
136-A New Way to Service Color TV 192 p., 137 il.
$5.95
544-TV Trouble Diagnosis Made Easy 256 p., 213 il.
p.
809 -Photo Symptom/Guide: Solid-State Color TV Troub. 224
772 -Troubleshooting with the Dual -Trace Scope 224 p. 252 il. $5.95
738 -TV Schematics: Reading Between the Lines 252 p. 188 il. $5.95,
605-Install./Svcrng. Elect r. Protective Systems 252 p. over 160 il. 57.95
696-TV Tuner Schematic/Servicing Manual-Vol. 1 224 p. 287 il. $6.95,
979 -TV Tuner Schematic/Servicing Manual-Vol. 2 200 p. 374 il. $6.95
$5.95,
690 -Logical Color TV Troubleshooting 240 p. 151 il.
$5.95
559-199 TV Tough -Dog Problems Solved 252 p. 199 il.
$5.95
580-Modern Radio Repair Techniques 260 p. 207 il.
0 11" 122 il. $7.95,
532-How to Repair Solid -State Imports 192
$4.95
761 -Jack Darr's Service Clinic No. 3 252 p. 122 il.
125
il.
$4.9511
No.
1
192
p.
133 -Jack Darr's Service Clinic
430 -Pinpoint Transistor Troubles in 12 Minutes 492 p. 243 il. $6.95
$5.95
595-199 Color TV Troubles & Solutions 224 p. 178 il.
507-101 TV Troubles -From Symptom to Repair 224 p 170 il. $6.95,
619-T'shooting Solid -State Electr. Power Supplies 208 p. 85 il. $4.95
$6.95,
778 -Small -Screen TV Servicing Manual 240 p. 367 il.
653
-shooting Solid-State Wave Gen. & Shaping Circa. 92 p. $4.95
$4.95,
636 -Installing TV & FM Antennas 168 p 158 it
Manual
250
p.
$6.95
Ser.
Police,
Ham
Scanners
835-VHF/UHF Fire,
$4.95
625 -Troubleshooting Solid -State Amplifiers 256 p. 95 il.
732-Jap Consumer Electr. Ser. Man.196 p. Incl. schematic foldout 65.95,
$5.95
694 -Auto Stereo Service & Installation 252 p 24511.
$5.95,
p..8"
-1
BROADCAST. CATV. CCTV 8 VIDEOTAPE
8' Anatomy of Local Radio-TV Copy -4th Ed 140 p.
865-CATV Program Origination 8 Production 256 p. 64
811 -Complete Hdbk of Videocassette Recorders 280 p.
852-B'cast Engr. & Maintenance Hdbk 532 p. 235 il.
815-Desig./Maintain. CAN/Small TV Studio 288 p. 100
768-Cablecasting Production Handbook 210 p., 44 il.
$5.95,
$14.95
il.
160 il.
$12.95,
il.
833-Complete Broadcast Antenna Handbook 448 p. 310 d.
523 -Guide to Radio-TV Beast Engineering Pract. 288 p. 140 il.
733 -Directional Broadcast Antennas 210 p. 60 il.
557 -How To Become A Radio Disc Jockey 256 p. 36 il.
845 -How to Prepare a Production Budget: Film & Videotape
541 -Videotape Prod. & Comm. Techniques 256 p. 100 il.
793 -TV Ld.htin Handbook 228
230 il.
10 -DAY FREE
$5.9511
$19.95
1009 -CCTV Installation, Maintenance & Repair 294 p., 208 il.
773 -Talk-Back TV: Two-Way Cable Television 238 p. 64 it
$12.95
$8.95
$5.95,
$17.95
$12.95,
$12.95
$12.95
$12.95'
$12.95
$12.9-
TRIAL -NO RISK COUPON
TAB BOOKS, Blue Ridge Summit, Pa. 17214
Please send me the books indicated below:
TRANSISTORS
1216 -Towers' International OpAmp Linear-IC Selector 190 p.
1016-Towers' International FET Selector 140 p., 97 il.
1010-Towers' Inter. Transistor Selector 200 p. 179 il. 7" x 10"
856 -Master OP -AMP Applications Handbook 476 p. 320 il.
960 -IC Function Locator 224 p..28 il.
984-CMOS Dalabook 280 p. 20 il.
870 -Master Tube Substitution Handbook 322 p. 576 il.
717 -Transistor Theory for Technicians & Engrs. 224 p. 116 il.
938 -Linear IC Applications Handbook 280 p. 183 il.
470 -Transistor Circuit Guidebook 224 p. 118 il.
794 -Microelectronics 266 p. 228 il.
708 -Modern Applications of Linear IC's 276 p. 301 il.
il
1148 -How to Repair Old -Time Radios 252 p., 162 il.
$7.95
827-Ham Radio Advanced Class License Study Guide 252 p. $6.95
543-Ham Radio Extra -Class License Study Guide 224 p. 162 rl. $5.95
$4.95
989-Ham Radio Incentive Licensing Guide 154 p. 34 il.
&
85k
$6.95
$4.95
TV. RADIO & ELECTRONIC SERVICING
851 -Ham Radio General Class License Study Guide 448 p.
SEMICONDUCTORS. TUBES
II
.
ELECTRONIC MUSIC
Send postpaid.
endose $
Invoice me on 10 -day trial (plus shipping)
I
$7.95
$4.95
$6.95
$995
$5.95
$6.95
$4.95
$5.95
$6.95
$5.95
$5.95
$9.95
Cl
Book #
Book #
Book #
Book #
Phone
Name
Company
MODEL RADIO CONTROL
$695
1174 -Model Radio Control 252 p., 237 il.
1093-Radio Control Handbook -4th Edition 420 p. 315 il.
$5.95
1135-Radio Control Manual -Sys., Circuits, Const.-3rd Ed.
825-Flying Model Airplanes/Helicopters by RC 192 p. 147 il. $5.95
747-RC Modeler's Handbook of Gliders & Sailplanes 196 p. 143 il.
6 95
417
il.
Models
p.
350
812 -Radio Control for
693 -Model Sail& Power Boating by Remote Control192p.125il. $546.9955
$4.95
122 -Advanced Radio Control 192 p. 181 it
$9.95,
Address
.i
State
Zip
$4.95,
$4.95,
CIRCLE
3 ON FREE
INFORMATION CARD
Pa. add 6% Sales tax. All orders outside USA
m
must
add 15% shipping and be prepaid.
IMIMIIIIIMIMM.
RE -380
IMBI...
Sabtronics gives you DMMs and Frequency
Counters with more features, better
performance and incredibly lower prices
Model 2010A Bench/Portable DMM:
Features: 3'/2 digit LED display 31 measurement
ranges 6 -Functions 0.1% Basic DCV accuracy
Touch -and -hold capability Hi -Lo Ohms 40 Hz
to 40 kHz frequency response Auto Zero, Auto
Polarity Overload protected Overrange indication Single chip LSI logic Laser -trimmer
resistor network and ultra -stable band -gap
reference for better long term accuracy Built-in
NiCd battery charging circuit.
Brief Specifications: DC Volts 100µV to 1000V in 5
ranges; AC Volts 100µV to 1000V in 5 ranges; DC
Current 0.1µA to 10A in 6 ranges; AC Current
0.1µA to 10A in 6 ranges; Resistance 0.12 to
20M 12 in 6 ranges; Diode Test Current 0.1µA to
lmA in 3 ranges; Input impedance, 10M Sl on AC
and DC volts; Power requirement, 4.5 to 6.5 VDC
(4 "C" cells) or optional AC adapter/charger.
Model 2015A Bench/Portable DMM:
Same features and specifications as Model 2010A
except with large, 0.5" LCD 31/2 digit display.
Optional Accessories
#AC -115, AC adapter/charger $7.95
#THP-20, Touch and Hold Probe $19.95
#NB -120 NiCd Battery Set $17.00
$109.95
Model 8610A Frequency Counter:
Features: 8 -digit LED display 10 Hz to 600 MHz
guaranteed frequency range (5 Hz to 750 MHz
typical) 3 Gate times 10 MHz TCXO Time
base Auto decimal point Overf16w indicator
Leading zero blanking Resolution to 0.1 Hz
Built-in charging circuit for NiCd batteries.
Brief Specifications: Frequency Range, switch
selectable, 10MHz, 100 MHz, 600MHz Sensitivity, ± 10mV RMS to 100 MHz, t 50mV RMS, 100
MHz to 450 MHz; 90mV RMS 450 MHz to 600
MHz Impedance, 1M S2, 10 MHz and 100 MHz
ranges; 50 S2 600 MHz range Gate time (switch
selectable) 0.1 sec, 1 sec, 10 sec Temperature
stability, 0.1 ppm/°C Ageing rate ± 5 ppm/yr
Accuracy, 1 ppm or 0.0001% Input protection,
150V RMS to 10 kHz (declining with frequency)
Power Requirement, 4.5 to 6.5V DC @ 300mA (4
"C" cells) or optional AC adapter/charger (7.5 to
9V DC @ 300 mA).
Ordering Information
USA - Add $5.00 per order for shipping & handling. Personal checks have to clear before goods are
shipped (allow 2-3 weeks). For faster delivery send
cashiers check or money order. 10% deposit for
C.O.D. orders. Florida residents add 4% sales tax.
CANADA - Add $7.50 per kit for shipping &
handling. No C.O.D. Payment in U.S. funds.
OVERSEAS - Add $21.00 per unit for airmail
delivery. Payment by bank draft in U.S. funds
Also available Model 8110A, same
as 8610A except maximum
frequency is 100MHz and without
battery charging circuit:
'
$79.95
123'-15b
MEOUMEI
we
RORPYENrE
aabtronica ®
RW051
MNAINPCI
WON ,Rt OIR NCv r .CCN1FP
r50N
R5
,
Model 8610A
$109.95
Making Performance Affordable
sabtronics'
INTERNATIONAL INC
CALL TOLL FREE
1-800-237-5567
(In
Continental U.S. only)
1813) 623-2631
or
masrerchar'
NI
www.americanradiohistory.com
coupon on adjacent page
N. 50th Street
MIS 35
Tampa, Florida 33610
Mail in
'5709
Fla. Residents and Foreign Countries Call
Sabtronics NEW Hand-held Digital Multimeters.
.
The only thing that
beats their performance
is their price.
+150°C range (-58°F to +302°F) and
Accurate performance you can rely on,
time after time. That's what you expect
from a quality DMM. But don't expect
to pay as much for it any more. Because
now Sabtronics brings you top quality
DMMs with more features and better accuracy than other comparable units on
the market today. And they cost surprisingly less!
We cut the price.
Not the quality.
What you get is a precision crafted unit
that features single-chip LSI logic, laser
trimmed resistor network and a stable
band -gap reference element for better
long term accuracy. Basic DCV accuracy
is 0.1%. The Model 2035A gives you 32
measurement ranges over 6 functions
and the Model 2037A an additional two
temperature ranges:
First in features.
First in price.
Both models feature touch -and -hold
capability with the optional probe - it's
so convenient, you'll wonder why the
expensive models haven't got it yet! And
two -terminal input for all measurement
functions - this eliminates lead switching
and makes your job easier. The Model
2037A even has a built-in temperature
measuring circuit with a -50°C to
supplied complete with the sensor
probe. Of course, auto zero, auto
polarity and overload protection
are standard. And you get 200
hour operation from a single 9V
transistor battery. A low battery
indicator warns you of the
last 20% of battery life. The
large, crisp LCD readouts
allow easy viewing even in
bright sunlight.
Your models 2035A &
2037A come with a full
one year warrantee from
Sabtronics International,
makers of top quality test
equipment.
is
Biggest value in
small DMMs
We are so sure that the Model 2035A and
2037A are the best values available that we
offer a money -back guarantee. Examine
either unit in your own home for 10 days,
and if you are not convinced that it is the
best value for your money, return it in its
original condition for a prompt and
courteous refund of the purchase price (less
Model 2035A
$99.95
shipping and handling). Order yours today!
Use the convenient order form or call us
CALL TOLL FREE
toll free with your Master Charge or Visa 1-800-237-5567 (Continental U.S. only)
number.
Foreign Countries Call
Fla. Residents and
(813) 623-2631
Making Performance Affordable
or
SBbtronicS
Mail in coupon
5709
BRIEF SPECIFICATIONS:
DC VOLTS: 100g V - 1000V, 5
ranges'
AC VOLTS: 100)1V - 1000V, 5 ranges
DC CURRENT: 0.1µ A - 2A, 5 ranges
AC CURRENT: 0.1µ A - 2A - 5 ranges
- 20M S2, 6 ranges
Hi -OHMS: 0.1
Lo -OHMS: 0.1 12 - 20M , 6 ranges
TEMPERATURE: - 50 °C - + 150 °C
- 58 °F - +302 °F), 2 ranges
SE
SE
(Model 2037A only)
WEIGHT: 11 oz. (excl. battery)
OVERLOAD PROTECTION: 1000V DC
or AC peak all voltage ranges, 250V
DC or AC peak all Ohms ranges;
2A/250V fuse
all
current ranges.
SABTRONICS SERVICE AVAILABLE
IN MOST COUNTRIES OF THE
WORLD
Mail to:
Please send me
N.
50th Street
M/S 35
Tampa, Florida 33610
INTERNATIONAL INC
Sabtronics International, Inc., 5709 N. 50th Street,
M/S 35 Tampa, Florida 33610.
...
Model 2035A Hand-held Multimeter @ $99.95 each
Model 2037A Hand-held Multimeter @ $119.95 each
NTHP-20 Touch -and -hold Probelsl @ 519.95 each
Model 201 OA Bench/Portable DMM @ $89.95 each
Model 201 5A Bench/Portable OMM @8109.95 each
Model 8110A Frequency Counter @ 579.95 each
Model 8610 A Frequency Counter @ 5109.95 each
Shipping and Handling @ $ 5.00 per unit
For Delivery in Florida. add 4% Sales Tax
TOTAL
Visa
Enclosed .- Check _ Money Order _. Master Charge
(Allow 2-3 weeks clearance time for personal checks). 10% deposit for C.O.D.
Expiry Date
Charge my credit card X
-
S
5
S
S
S
S
S
S
S
5
Name
Street
State
Continental U.S. only. AK, HI & PR: $6.00. Canada: $7.50. Foreign: $21.00 Airmail.
City
Apt.
Zip
...
EQUIPMENT REPORTS
culator. It is pocketable
if you have a
good -size pocket! Power for the unit is provided by an internal 9 -volt battery (included). An
ordinary battery may be expected to last about
100 hours with typical intermittent use. An
alkaline battery will approximately double that
lifetime. Alternately, an AC adaptor is available for test bench applications.
When battery voltage becomes too low (under 7 volts) to assure accurate measurements, a
LO-BAT indication comes up clearly on the
LCD display.
Automatic overrange indication is provided
by the display blanking and leaving one digit
and a decimal point. The 938 is current -protected by a replaceable internal input fuse. A
spare fuse is provided, handily mounted inside
the instrument case for easy replacement.
Also provided is a pair of 12 -inch long test
continued from page 26
Data Precision Model 938
Digital Capacitance Meter
ALTHOUGH DISPLAY SPEEDS ARE STILL SLOW
when compared to other forms of character
readouts, the trend toward LCD digital equipment seems well established.
A recent introduction to the field in Data
Precision's 938 31/4 -digit capacitance meter.
The half -inch liquid crystal display shows high
contrast, and is easily readable at distances of
at least 20 feet.
The meter itself measures 61/4 X 3'/2 X 11/2
inches-about the size of a good scientific cal-
Creative Computing can help you select
the best computer and get the most out of it.
With so many new personal computers being announced and the prices
coming down so rapidly, isn't the best bet
to wait a year or so to buy a system?
We think not. A pundit once observed
that there are three kinds of people in the
world 1) those who make things happen,
2) those who watch things happen and 3)
those who wonder what happened.
Today, it is those who are getting involved
with microcomputers who are making
things happen by learning to use
:
computers effectively.
Furthermore, it is not likely that we
will see the same dramatic price declines
in future years that have already taken
place. Rather, one will be able to get more
capability for the same price.
The TI -99/4 has excellent color graphics and
costs 57150 including color TV monitor.
Which system is for you?
No two people have exactly the same
needs. You'll have to determine what
capabilities are important to you. Key
variables include:
Upper and lower case. Obviously
vital if you are planning to do word processing or anything with text output.
Graphics. Most systems
have
graphics but the resolution varies widely.
How much do you really need?
Color. Some systems are BBW,
some have 4 colors, others up to 256
colors. Many colors sounds nice, but do
you really need 4, or 16, or more?
Mass storage. The smaller systems
are cassette based; larger systems offer
floppy disks or even hard disks. What size
data bases do you Intend to use and is It
important to have high-speed random
access to an entire data base?
Languages. Basic Is standard but
Increasingly Pascal, Fortran, Cobol and
special purpose languages are being
offered.
Audio, Speech, Music. Are these
features important for your planned
applications?
Applications Software. Third party
software Is widely available for some
systems, non-existent for others. Do you
reed this, or can you write your own?
Unbiased, in-depth evaluations.
At Creative Computing, we obtain new
systems as soon as they are announced.
We put them through their paces in our
Software Center and also in the environment for which they are intended
home, business, or school. We published
the first in-depth evaluations of the Texas
Instruments99/4, Atari 800, TRS-80, Ohio
Scientific Challenger, Exidy Sorcerer,
Apple II disk system and Heath H-8. We
intend to continue this type of coverage,
not only of systems, but peripherals and
software as well.
-
Contributing editor Ted Nelson (L) is author of
"Computer Lib/ Dream Machines." Publisher
David Ahl (R) Is a pioneer in computer modela,
simulations and games.
Sorting: A Key Technique
While evaluations are Important, the
main focus of Creative Computing magazine Is computer applications of all kinds.
Many of these require that data be retrieved or sorted. Unfortunately, most
programming texts focus on the bubble
sort (or straight insertion) and, very Infrequently, another technique (usually delayed replacement) and let It goat that.
Yet, except for comparison counting,
the bubble sort is the least efficient.
Tutorials and articles in Creative Computing demonstrate that the Shell -Metzner and Heapsort are from 50 to 1? COO
times as fast as the bubble sort! Consider
a sort of 100,000 Items on a DEC System
10:
Bubble sort
7.1 days
Delayed replacement
3.8 days
Heapsort
17.3 minutes
Shell -Metzner
15.0 minutes
Needless to say, on a microcomputer, a
bubble sort of even 1000 items Is
agonizingly long.
Free Sorting and Shut fling Reprint
Because sorting and shuffling (mixing
list of Items) is so vital In most programming, we are making available a 20 -page
reprint booklet on Sorting, Shuffling and
File Structures along with our May 1979
issue which has several articles on writing
user -oriented programs and making the
most of available memory space. The
reprint booklet and issue are free with
12 -issue or longer subscriptions.
At Creative Computing, we believe
that computers can be of benefit to
virtually every intelligent person in the
a
country. We do not believe that the
"Computer priesthood" should confuse
and bully the public. As Ted Nelson stated
in the Computer Lib Pledge, we do not
treat any question as a dumb question,
since there Is no such thing. We are
against computer terms or systems that
are oppressive, insulting or unkind, and
we are doing the best we can to Improve or
replace such terminology or systems. We
are committed to doing all we can to
further human understanding and make
computers easy to understand, interactive wherever possible, and fun for the
user, The Complete Computer Lib Pledge
is contained in our May 1979 Issue which
we are furnishing free to new subscribers.
Computer literacy to everyone
The Creative Computing Software
Division is participating with Children's
Television Workshop in an Important new
venture, Sesame Place. These theme
parks are being designed to bring interactive computer games and simulations
to young children (and their parents) and
remove the mystique of computers from
the youngest segment of our population.
In addition, we are participating in projects with several school systems and
museums to write reading comprehension and ecology simulations software.
We are also Involved in a major college level computer literacy project.
As a subscriber to Creative Computing, you will benefit from all of these
activities. Creative Computing is the
Number 1 software and applications
magazine. Subscribe today
12 Issues
for $15 ($9 saving over the newsstand
price). Or, beat Inflation and get 36 issues
for just S40. Money back if you're not
satisfied. Send payment or Visa, Master
Chargeor American Express number to:
Creative Computing, Attn: Alison
P.O. Box 789-M
-
Morristown, NJ 07960
Save time, and call your order toll -free to:
800-631-8112
(in NJ call 201-540-0445)
Free reprint booklet and issue with a ne
scription to Creative Computing.
To start your 12-issue subscription to Creative Computing, circle reader
service no. 65. You will be billed S15.
sub-
creative computing
For a free catalog of books end software.
CIRCLE 65 ON FREE INFORMATION CARD
circle reader service no. 70.
leads with alligator clips. An integral panel mounted socket featuring a spring -clip connector for rapid capacitor insertion is also provided. We had considerable difficulty inserting
leads of our test capacitors in several of the
socket holes. We found the alligator clips more
positive except at the lowest capacitance
ranges where test lead capacitance was a problem. The holes in the panel-mounted socket
loosened up after repeated insertions with a
stiff wire.
CIRCLE 103 ON FREE INFORMATION CARD
We encountered some other minor difficulties as well. The battery leads in our unit were
so short that battery installation had to be
forced, pulling some of the insulation away
from one lead. The on/off slide switch was
quite touchy; when on, only a slight pressure
against the slide would shut down the meter.
The soft plastic window protecting the LCD
display is quite susceptible to scuffing. Users
are cautioned to remove dust carefully.
Now, the good points-of which there are
many! With eight capacitance ranges, measurements from .1 pf to 2000 µF are possible.
Range selection is manually chosen by pressing
any one of eight interlocked switches. Sampling rate is two per second, and "settling
down" time of the meter is usually within one
second for a stable reading. At the worst, stable readings are available within five seconds
on the highest capacitance ranges.
Accuracy is ± 0.1% (+ I digit) on any scale
(except 1% on the highest range). If a standard
capacitance is available, a handy internal trimmer may be used to tweak up calibration. A
convenient front-panel thumbwheel trimmer
allows rapid zeroing to improve low-range
accuracy. Peak excitation on any range is 2.8
volts, with the positive side always higher than
the negative.
The circuit is a departure from most capacitance meters that measure indirectly. Classically, capacitance is defined as coulombic
charge as compared to voltage. The 938 measures that relationship directly, viala dual -slope
integrating A/D converter. The output of the
analog measurement is fed into an Intersil
7106 chip, the same IC used in Data Precision's digital multimeter.
The accompanying manual is exceptionalit's both well written and profusely illustrated.
Explanations are included of meter circuitry (a
complete schematic diagram is included), capacitance theory, instrument calibration technique, general maintenance, and operational
instructions.
When properly calibrated, an accurate capacitance meter is an invaluable aid in circuit
design and troubleshooting. For determining
drift rate of frequency-determining capacitors,
the LCD meter will find a useful application.
Similarly, leaky capacitors that degrade circuit
continued on page 32
NEW 1980 DIGITAL MULTIMETERS FROM
i
FLUK EI
8010A and 8012A
31/2 -Digit LCD's - view in any light
Conductance function - resistance to 10,000 MD
AC measurements to 50 kHz and higher
Large
8010A
$249
True RMS for ac accuracy
Touch -Hold probe for tricky places (Y8008)
Diode test and low power ohms
$289
w/rechargeable
batteries
(option -01)
AC or dc current to 10 amps with 8010A
Resistance resolution to 0.0010 with 8012A
Built-in batteries and charger (Option -01)
NEW
8050A
8012A
$329
$299
$379
w/rechargeable
batteries
(option -01)
$339
IMMEDIATE DELIVERY
8050A
-digit multimeter
microprocessor technology
41/2
dB: That's right, direct
readings in dBm, referenced
to any of 16 impedances that
you select from the 8050A's
scrolling reference memory.
REL: This stands for relative
reference in the dB mode or
offset measurements in other
functions.
w/rechargeable
batteries
(option -01)
Conductance function - resistance to 100,000M2
AC measurements to 50 kHz and higher
True RMS for ac accuracy
Touch-Hold probe for tricky places (Y8008)
Model 8020A:
The Analyst
8022A
Diode test and low power ohms
Built-in batteries and charger (Option -01)
Seven functions
dc voltage
ac voltage
dc current
ac current
$139
resistance
diode test
conductance (1/R)
NEW
31/2 -digit
Model 8024A:
The Investigator
resistance
diode test
conductance (1/R)
logic level and
continuity detect
temperature (K -type
thermocouple)
8020A
Model 8022A:
The Troubleshooter
Peak hold on voltage
and current functions
Nine functions
dc voltage
ac voltage
dc current
ac current
$179
Six functions
dc
ac
dc
ac
Selectable audible
indicator for
continuity
or level detection
3'/z.digit resolution
0.1% basic dc accuracy
LCD display
voltage
voltage
current
current
resistance
diode test
31/2 -digit
0.1% basic dc accuracy
LCD display
Overload protection
resolution
Free case
Two year parts
and labor warranty
0.25% basic dc accuracy
Overload protection
LCD display
Overload protection
Please add $3.00 for shipping and handling.
THE TEST EQUIPMENT SPECIALISTS
TOLL FREE HOT LINE
800-223-0474
EST 45th STREET, NEW YORK, N.Y. 10036
resolution
212-687-2224E
I
Start Computing For Just $129.95 With An
8085 -Based Professional Computer Kit-
EQUIPMENT REPORTS
continued from page 30
By Netronlcs
Explorer/85
100% compatible with all 8080A and
8085 software & development tools!
No matter what your future computing plans may
be, Level "A "-at $129.95 -is your starting point.
Starting at just $129.95 for a Level "A" operating system,
you can now build the exact computer you want. Explorer/85
can be your beginner's system, OEM controller, or IBMformatted 8" disk small business system... yet you're never
forced to spend a penny fora component or feature you don't
want and you can expand in small, affordable steps!
Now, for just $129.95, you can own the first level of a fully
expandable computer with professional capabilities-a computer which features the advanced Intel 8085 cpu, thereby
giving you immediate access to all software and development
tools that exist for both the 8085 and its 8080A predecessor
(they are 100% software compatible/
computer which
features onboard S-100 bus expansion -plus instant conversion to mass storage disk memory with either 5-1/4" diskettes
or standard IBM -formatted 8" disks.
For just $129.95 (plus the cost of a power supply, keyboard/
terminal and RF modulator, if you don't have them already),
Explorer/85 lets you begin computing on a significant level...
applying the principles discussed in leading computer magazines. developing "state of the art" computer solutions for
both the industrial and leisure environment.
-a
registers... single step with register display
at each break point
..go to execution address. Level "A" in the Hex Version
makes a perfect controller for industrial applications and can
be programmed using the Netronics Hex Keypad/Display.
Hex KeypadlDisplay
Specifications
Hex Keypad/Display.
Level
"B" Specifications
Level"B" provides the S-100 signals plus buffers/drivers to
support up to six S-100 bus boards and includes: address
decoding for onboard 4k RAM expansion select -able in
4k blocks...address decoding for onboard 8k EPROM expansion selectable in 8k blocks...address and data bus drivers for
onboard expansion... wait state generator (jumper selectable),
to allow the use of slower memories...two separate 5 volt
regulators.
Level
.
Level
"A" Specifications
"A"
Explorer/85's Level
system features the advanced Intel
8085 cpu, an 8355 ROM with 2k deluxe monitor/operating
system, and an 8155 ROM -I/O
on a single motherboard
with room for RAM/ROM/PROM/EPROM and S-100 expansion, plus generous prototyping space.
-all
(Level "A" makes a perfect OEM controller for industrial
appications and k available in a special Hex Version which
can be programmed using
the Netronics Hex Keypad/
Display.)
PC Board: glass epoxy, plated
through holes with solder mask
I/O: provisions for 25 -pin
(DB25) connector for terminal
Level "A" at $129.95 is a serial I/O, which can also supcomplete operating system, port a paper tape reader
..provision for 24 -pin DIP
perfect for beginners, hobbiests, or industrial con- socket for hex keyboard/dis-
iroller use.
play... cassette tape recorder input...cassette tape recorder output ...cassette tape control
output...speaker output... LED output indicator on SOD
(serial output) line...printer interface (less drivers)... total of
four 8 -bit plus one 6 -bit I/O ports *Crystal Frequency: 6.144
MHz
Control Switches: reset and user (RST 7.5)
interrupt...additional provisions for RST 5.5, 6.5 and TRAP
interrupts onboard Counter/Timer: programmable, 14 -bit
binary
System RAM: 256 bytes located at F800, ideal for
smaller systems and for use as an isolated stack area in
expanded systems... RAM expandable to 64k via S-100 bus or
4K on motherboard.
System Monitor (Terminal Version): 2k bytes of deluxe
system monitor ROM located at F000 leaving 0000 free for user
RAM/ROM. Features include tape load with labeling ...tape
dump with labeling...examine/change contents of memory
...insert data...warm start ...examine and change all
registers...single step with register display at each break point,
a debugging/training feature...go to execution address...
move blocks of memory from one location to another... fill
blocks of memory with a constant ...display blocks of memory
...automatic baud rate selection...variable display line length
control (1-255 characters/line)...channelized I/O monitor
routine with 8-bil parallel output for high speed printer...
serial console in and console out channel so that monitor can
communicate with I/O ports.
System Monitor (Hex Version): Tape load with labeling...
tape dump with labeling... examine/change contents of memory... insert data. .. warm start... examine and change all
Calculator type keypad with 24
system defined and 16 user
defined keys. 6 digit calculator
type display which displays full
address plus data as well as
register and status information.
Level
"C" Specifications
"C"
expands Explorer's
motherboard with a card cage,
allowing you to plug up to six
5-100 cards directly into the
motherboard. Both cage and
Explorer/85 with Level cards are neatly contained inside
"C"card cage.
Explorer's deluxe steel cabinet.
Level "C" includes a sheet metal superstructure, a 5 -card gold
plated S-100 extension PC board which plugs into the motherboard. Just add required number of S-100 connectors
performance can be identified with this meter.
Don't forget that when equipment has gone
out of spec, the blame can often be laid on
faulty capacitors.
One very handy application of an instrument
with such an accurate low -range scale would be
to measure capacitance -per-foot of coaxial cable. Also, leaky capacitors are revealed by a
continuously drifting reading.
Truly, the day of the cumbersome capacitance bridge seems to have passed, and the true
Q/V measurement of digital meters like the
model 938 is upon us.
A liberal two-year warranty accompanies
the versatile capacitance meter. The model
938 has a suggested retail price of $149. R -E
American Beauty T-7
Micro -Soldering Station
Level "D" Specifications
"D" provides 4k or RAM, power supply regulation,
filtering decoupling components and sockets to expand your
Explorer/85 memory to 4k (plus the original 256 bytes located
in the 8155A). The static RAM can be located anywhere from
0800 to EFFF in 4k blocks.
Level
Level
4
"E" Specifications
"E" adds sockets for 8k of EPROM to use the popular
Intel 2716 or the TI 2516. It includes all sockets, power supply
regulator, heat sink, filtering and decoupling components.
Sockets may also be used for soon to be available RAM IC's
(allowing for up to 12k of onboard RAM).
Level
Order A Coordinated
Explorer/85 Applications Pak!
Experimenter's Pak (SAVE 512.50) -Buy Level "A" and Hex
Keypad/Display for $199.90 and get FREE Intel 8085 user's
manual plus FREE postage & handling!
Student Pak (SAVE 524.45) -Buy Level "A," ASCII Keyboard/Computer Terminal, and Power Supply for $319.85 and
get FREE RF Modulator plus FREE Intel 8085 user's manual
plus FREE postage & handling!
Engineering Pak (SAVE $41.00)-Buy Levels "A," "B,"
"C," "D," and "E" with Power Supply, ASCII Keyboard/
Computer Terminal, and six S-100 Bus Connectors for $514.75
and get 10 FREE computer grade cassette tapes plus FREE
8085 user's manual plus FREE postage & handling!
Business Pak (SAVE 589.95) -Buy Explorer/85 Levels "A,"
"B," and "C" (with cabinet), Power Supply, ASCII Keyboard/Computer Terminal (with cabinet), 16k RAM. 12"
Video Monitor, North Star 5-1/4" Disk Drive (includes North
Star BASIC) with power supply and cabinet, all for just
$1599.40 and get 10 FREE 5-1/4" minidiskettes ($49.95 value)
plus FREE 8085 user's manual plus FREE postage & handling!
Continental U.S.A. Credit Card Buyers Outside Connecticut
CALL TOLL FREE 800-243-7428
r- Netronics R&D Ltd., Dept. RE -3
To Order From
Connecticut Or For Technical
Assistance, Etc. Call (203) 354-9375
333 Litchfield Road, New Milford, CT 06776
sonalized disk operating system
Please send the items checked belowplus $2 p&h.
plug it in and you're up and running!),
Explorer/85 Level "A" Kit (ASCII
Deluxe Steel Cabinet for ASCII $699.95 plus $5 p&h.
Version), $129.95 plus $3 p&h.
Keyboard/Terminal, $19.95 plus $2.50 Power Supply Kit for North Star
Explorer/85 Level "A" Kit (Hex p&h.
Disk Drive, $39.95 plus $2 p&h.
Version), $129.95 plus $3 p&h.
Power Supply Kit
Deluxe Case for North Star Disk
8V @ 5 amps)
8k Microsoft BASIC on cassette in deluxe steel cabinet, $39.95 plus $2 Drive, $39.95 plus $2 p&h.
tape, $64.95 postpaid.
p&h.
Experimenter's Pak (see above),
8k Microsoft BASIC in ROM Kit
Gold Plated S-100 Bus Connectors, $199.90 postpaid.
(requires Levels "B," "D," and "E"), $4.85 each, postpaid.
Student Pak (see above), $319.85
$99.95 plus $2 p&h.
D RF Modulator Kit (allows you to postpaid.
Level "B" (S-100) Kit, $49.95 plus
use your TV set as a monitor), $8.95
Engineering Pak (see above),
p&h.
$2
postpaid.
$514.75 postpaid.
D Level "C" (S-100 6 -card expander)
16k RAM Kit (S-100 Board expands
Business Pak (see above), $1599.40
Kit, $39.95 plus $2 p&h.
to 64k), $199.95 plus $2 p&h.
postpaid.
Level "D" (4k RAM) Kit, $69.95
32k RAM Kit, $329.95 plus $2 p&h.
Total Enclosed $
plus $2 p&h.
48K RAM Kit, $459.95 plus $2 p&h.
(Conn. res. add sales tax) By
Level "E" (EPROM/ROM) Kit,
64k RAM Kit,..6589.95 plus $2 p&h.
El Personal Check G M.O./Cashier's
$5.95 plus 50e p&h.
164 RAM Expansion Kit (to expand
Check
Visa
Master Charge
D Deluxe Steel Cabinet for Explorer/ any of the above up to
64k), $139.95
85, $49.95 plus $3 p&h.
(Bank
plus $2 p&h each.
D ASCII Keyboard/Computer Ter- D Intel 8085
Acct. N
cpu User's Manual, $7.50
minal Kit (features a full 128 character
postpaid.
Signature
Fxp Date
set, upper & lower case, full cursor conSpecial
Computer
Grade
Cassette
Print
trol, 75 ohm video output convertible
Tapes, $1.90 each or 3 for $5, postpaid.
Name
to baudot output, selectable baud rate,
12" Video Monitor (10 MHz bandRS232-C or 20 ma. I/O, 32 or 64 charwidth), $139.95 plus $5 p&h.
Address
acter by 16 line formats, and can be
North Star Double Density Floppy
used with either a CRT monitor or a TV
Disk Kit (One Drive) for Explorer/ City
set (if you have an RF modulator),
85 (includes 3 drive S-100 controller,
$149.95 plus $2.50 p&h.
LD Hex Keypad/Display Kit, $69.95 DOS, and extended BASIC with per - State
Zip
to
Send Me Information
oari
CIRCLE 43 ON FREE INFORMATION CARD
-just
(t
-
N)
i
CIRCLE 104 ON FREE INFORMATION CARD
ANYONE WHO HAS EVER DONE A FAIR AMOUNT
of soldering will appreciate the flexibility of
American Beauty's new model T-7 Micro-Soldering Station. While it is certainly possible to
do an array of soldering jobs with only one tip
size and a single wattage iron, there is no substitute for having just the right amount of heat
when you need it -and the right soldering tip
to match.
The T-7 allows heat adjustment from 175°
to 910° Fahrenheit (79° to 487° Celsius) via a
front -panel calibrated potentiometer control.
A series of replaceable tips, both needle and
chisel points, increases the flexibility of this
well engineered tool.
The T-7 is designed for serious electronic
applications. For the inveterate home builder,
it can be used in cramped quarters as well as on
wired terminals. However, it cannot be used
for heavy-duty soldering of large metallic surfaces where rapid heat sinking will quickly dissipate the small tip of the 12 -wait (nominal)
heating element.
Soldering tips are very easily changed. The
replaceable element and shank is removed as
one piece, securely held in place in the handle.
The electrical connection to the element is
made by a snug push-on terminal. The tip is
powered by low-voltage AC, isolated from the
power lines by a transformer. A three -wire
grounded cable provides an additional measure
of safety.
Current to the tiny tip is controlled by an
electronic circuit built into the console, and
continued on page 80
ADVANCE IS PROUD TO INTRODUCE
H I TAC H I Line of High Quality Oscilloscopes
All Hitachi Instruments
The
Are Backed by A Two -Year Warranty
sync -separator circuit facilitates rapid video
signal measurement.
Extra -high sensitivity; vertical sensitivity of
lmV/div. now available.
Built-in signal delay line for leading edge observation of quick -rising waveforms (V-301 and V-302).
X -Y operation very convenient for measuring
phase difference of two waveforms.
Sweep -time magnifier effective for precise
measurement; sweep time magnifying 10 times
with one -touch operation.
Trace rotation system for easily adjusting
bright -line inclination caused by terrestrial
magnetism.
Z-axis input provided-possible to use as CRT
display.
0.2ps¡-0.2s-wide sweep range setting.
One -touch shifting waveform slopes.
Five modes of vertical deflection operation
(Type V-152 and V-302).
Panel layout with color -coding of respective
TV
r
w
Hitachi Oscilloscope V-302
DC-30MHz dual -trace
TV sync -separator circuit
2. High -sensitivity mV/div
1.
1
(5MHz).
3. Signal delay line
4. X-Y operation
5.
6.
7.
Sweep -time magnifier (10 times)
Trace rotation
Z-axis input
(Intensity modulation)
functions.
(Also available in single -trace)
.
HITACHI V-302 & V-152
ormunKont v.tra
»..
Put a proven Hitachi dual -trace oscilloscope on your bench
for as little as $695. Our V-152 15MHz model includes un-
precedented sensitivity (1 mV/div.)...10X sweep magnification...front panel XY operation...trace rotation...Z-axis
input...and more. Need greater bandwidth? Our V-302
model is the only 30MHz dual -trace scope with signal delay
line priced under $ 1000, with all the above features, to
make your testing operations fast, easy, and accurate.
Reliability is exceptional too. (As you'd expect from a
manufacturer with over 20 years of experience "cutscop- '
ing" the competition.) So exceptional, in fact, that Hitachi
quality is backed by a 2 -year warranty...the longest in the
industry. Whether you use it for teaching or repairs, for
video, audio, or computer testing, you can't find more
scope for your dollar than at Hitachi. Call for more details.
1
Hitachi Oscilloscope V-152
Normal Price
V-152 15 MHz Dual Trace $695*
V-302 30 MHz Dual Trace $945*
*Probes included.
Call For
Special Introductory
Price Offer
Hitachi...The measure
of quality.
Ì
---
DC-15MHz dual -trace
1.
TV sync -separator
2.
High -sensitivity
(5MHz)
3. X-Y
operation
1
circuit
mV/div
Sweep-time magnifier (10 times)
Trace rotation
6. Z-axis input
(Intensity modulation)
4.
5..
(Also available in single -trace)
THE TEST EQUIPMENT SPECIALISTS
TOLL FREE HOT LINE
ADVA
_____
800-223-0474
212.687-2224
ST 45th STREET, NEW YORK, N.Y. 10036
'
This is an offer you shouldn't resist. To
introduce you to the new family of oscilloscopes from B&K-PRECISION, we'll
let you "live with" one for up to 10 days,
free! We're confident that after trying
any one of our new scopes, you'll want
to keep it for a lot longer. Of course,
there's no obligation.
Leading off our 1400 series scopes is
the new 1479, 30MHz dual -trace
triggered scope. It's ready to challenge
your testing needs with 5 m V/cm vertical
sensitivity, 11.7 nS rise time, 50MHz
triggering and built in high- and low-pass
filters. A signal -delay line is built in to
permit view of the leading edge of high
frequency pulses. The 1479 also provides
differential input capability and algebraic
addition and subtraction of input signals.
For those requiring only a 15MHz
dual -trace scope, the 1477 is an outstanding solution. Having many of the features of the 1479, the 1477 also offers a
standard video sync separator for use
with video systems or computer terminals. If battery portability is essential,
the B&K-PRECISION 15MHz 1432 is a
field -proven workhorse. It's a full featured 3", dual -trace scope with an
optional battery pack. For a 10MHz re Model 1405 $280
e
«
Model 1432 $840
Model 1466 $560
+KPRfCIS/ON
sponse, choose either the dual -trace 1476
or the single-trace 1466. With video sync
separators and vectorscope capability,
both are standouts. For basic monitoring
applications, the low cost 3" 1405 is the
best answer.
Common features of all 5" 1400 series
scope include Z-axis inputs, plug-in PC
board construction, scope camera compatible CRT bezels, triggered sweep,
excellent high- and low -voltage power
supply regulation, built in calibration
signals and cool, energy -efficient operation. The 1466 draws 20 watts; the 1479
draws only 25 watts.
For immediate delivery on the scope
of your choice or for additional
information, contact your local
B&K- PRECISION distributor.
DYNASCAN
CORPORATION
6460 W. Cortland Street Chicago, IL 60635.312/889-9087
In
Canada Atlas Electronics Ontario
International Sales Empire Exporters Inc. 270 Newtown Road. Plainview. L.I., N.Y.
11803
Before you look at another scope,
try one of these free for 10 days!
Model 1477 $840
Model 1479 $1099
CIRCLE 52 ON FREE INFORMATION CARD
www.americanradiohistory.com
Model 1476 $700
J
AUTOOTIVE
BURGLAR
ALARnI
This "hassle -free" security system protects your car
and its contents without the need of a key to turn
it on and off. You can build one for less than $20.00.
STEVE R. STOUT
DID YOU EVER WANT TO INSTALL A BURGLAR ALARM IN YOUR CAR,
but didn't want to drill a hole in your fender or door for the
keyswitch? Or maybe you just couldn't find that convenient
place for a hidden switch under the dash? Or you just didn't
want the hassle of having to remember to turn the alarm on and
off.
This alarm will protect the contents of your car, without the
need for an outside key; you don't need to remember to turn it
off or on; it will sound instantly if your radio is removed, and the
basic unit can be built for less than $15.00 even if all parts are
purchased new.
How it works
The base of transistor Q1 (Fig. 1) is connected via RI to the
accessory terminal on your car's fuse block. This is a point that
is positive only when the car is running or the key is turned to
the accessory position. With the car running, Q1's collector is
low holding flip-flops ICI -a and ICI -b reset and causing Q2's
collector to be high. When the car is turned off, the collector of
QI goes high, enabling the flip-flops and pulling Q2's collector
low to trigger timer IC2-a. At the end of the timing cycle,
adjustable from 1-2 minutes, the output at pin 5 drops low,
clocking flip-flop ICI -a to the set condition. The alarm is now
armed and ready.
The base of transistor Q3 is connected via R7 to the switched
side of the dome light circuit (Fig. 2-a). When a door is opened,
the dome light goes on and transistor Q3's collector goes high,
driving the collector of Q4 low and triggering timer IC2-b. Note
that IC2-b will only start after flip-flop IC1-a has set because its
reset pin (pin 10) is connected to the Q output of ICI -a. At the
end of timer IC2-b's cycle, adjustable from 30-90 seconds, its
output at pin 9 drops low, clocking flip-flop ICI -b to the set
7805
+12 VOLTS
BATT
(NOT ACC
+5V
)
.,,,,
IN
OUT
R15
+5V
+
150/
25V
C4
C10
33/20V
1/2 7476
2
GND
GND
GND
VCC PR
POWER SUPPLY
+5V
O CK
16
15
R4
J
14
+5V
R18
68052
-
12
K
Q5
CL
o
8
Q1
+5V
1M
®
R20
3.3 K
R16
R5
R14
1K
470 K
1/2
556
14
500K
Cl
5
L+
R
VCC
0--
12
IC2-b
C2
IC2-a
Z
100/20V
05-2N2907 or MPS2907
/100/20V
+5V
=
+5V
+5V
11
GNO
+5V
7
e3.3K e27K
R6
R10
2.7K
8
C9"
R11
2.7K3.3K
('C5-C10:.050R.1)
C
R13
1K
04
C8"
02
R7
C
TO
10
13
2
2N2222 or MPS2222
HE P S5000
>RYI
1/2 556
R17
4
1
Q1, 02, (13, 04, (17-
Q5
+5V
+5V
500K
T
R19
I
if.
R2
2.7K
DOME
CONNECTION
(Fig. 2-a)
T0 Q7
(OPTIONAL, FIG. 4-a)
Q
IC1-b
CK
11Y3
3.3 K
1
1
PR
9
GND CL
2.7K
R1
ICI -a
K
L
1/2 7476
O
J
ACC
>
3.3K
C3
SET
Q3
3.3K
R12
1
0
Q
0
1
C
17K
RESET
Q
IC1
1
=
+5V
0= GND
1-SCHEMATIC of the hassle -free auto security alarm.
Circuit is
armed when driver leaves the car and is disarmed when
he returns and
switches on ignition.
FIG.
+12V
+12V
DOME
DOOR
SWITCHES
LIGHT
(N.C.)
PARTS LIST
Resistors 10% or better, V. watt
R1, R3, R7, R11, R15, R20, R21-3300 ohms
R2, R4, R6, R8, R10, R12, R22-2700 ohms
R5, R13-1000 ohms
R13
1K
TO
R7
R14-470,000 ohms
R16, R 17-500,000 ohms, miniature potentiometer
R18, R19, R23-680 ohms
IC1-7476 dual J -K flip-flop
AND
03 BASE
DOME
DOOR
SWITCHES
(N.C.)
STYLE
LIGHT STYLE
1
USE EXISTING CIRCUIT
FOR STYLE
1
2
}
DELETE 03, R7, R12 AND
CHANGE FOR STYLE 2
DOME LIGHTS
DOME
LIGHTS
a
b
FIG. 2-DOME LIGHT circuit may have door switches on ground side as at
a or in the "hot" side as at b.
BATT. (NOT ACC.)
ALARM
(BELL, SIREN ETC.)
OUTPUT
FIG.
3-RELAY
I
Q1 -04,Q7 -2N2222, MPS2222 or equal
condition. This turns on Q5 and Q6, pulling in relay RY I (Fig.
3) and sounding the alarm. If at any time before Hip -Hop ICI -b
sets, the key is turned to accessory or the car is started, Q1
conducts resetting both and disabling the alarm.
Options
is used to supply current to the horn or other alarm
device. When low -current relay is used, you may need to parallel double
contacts to carry load current.
C4-33 µF, 20 volts, electrolytic
C5 -C11-.05 or 0.1 µF, 16 volts, disc cer
D1, D2 -1N4148 or equal
Q5, Q8 -2N2907, MPS2907 or equal
Q6-HEPS5000 or equal
LED1-red LED, any size suitable
RY1-relay, 12 volts DC with contacts rated to handle load
+12
FROM Q6
COLLECTOR
IC2-556 dual timer
IC3-7805 5 -volt regulator, TO -220 case
Cl, C2-100 pF, 20 volts, electrolytic
C3-150 F. 25 volts, electrolytic
Transistor Q7, R21 and DI may be added (Fig. 4-a) for those
who wish the instant alarm feature. The free wire is connected
to your radio's chassis and made to look like an extra ground
www.americanradiohistory.com
+5V
TO IC1-h PIN
7
FREE WIRE TO RADIO
R21
3.3K
TO IC1-b PIN 8
a
+5V
R22
08
2N2907
2.7K
TO IC1-a PIN 14
ARMED INDICATOR
ON
ADD
-
OR
MPS2907
R23
680sz
N\
LED
Alarm operation
The following is a typical sequence showing the operation of
the alarm
1. Driver shuts off car and leaves.
2. Timer IC1-a starts and arms alarm after delay set by
1
b
at a provides added protection for radio, tape deck or CB set. Circuit at b shows when alarm is
FIG.
4-TWO OPTIONAL CIRCUITS. The circuit
armed.
+12V
TO BRAKE
o
LIGHTS
12V DC
RELAY
250
CONNECT ACROSS
LIGHT OR HORN
IN RADAR DETECTOR
wire. When the wire is cut or disconnected, Q7 conducts, pulling the preset inputs of both flip-flops low, setting them and
turning on the alarm.
Another option which helps during set-up and also lets you
know your unit is functioning is the alarm -armed indicator (Fig.
4-b). This is an LED connected so as to light when flip-flop
ICI -a is set and the alarm armed.
The circuit in Fig. 5, though not directly related to security, is
something you might consider while building the alarm system.
It is designed to automatically disconnect the car's cruise control, thus cutting down on reaction time, when the radar detector picks up a signal. The detected radar signal turns on the
transistor and pulses the relay-causing the brake lights to flash
on and off and disconnect the cruise control. You may have to
replace the 250-µF capacitor with a larger one-depending on
resistance of the relay coil. (Note: Not all cruise control systems
are deactivated by the brake lights. Editor.)
100K
1K
2N2222
.01
GND
FIG. 5-CRUISE-CONTROL is disconnected automatically when radar
detector picks up police clocking signal.
R16.
3. Thief or driver
is opened.
enters car. Timer IC2-b starts when door
4a. Thief disconnects radio and alarm sounds, or timer B
finishes cycle set by R17 and alarm sounds.
4b. Driver starts car, disabling alarm. Note that the alarm is
disabled anytime the car is running or the key is in the
accessory position.
Notes on construction
Check the configuration of the dome light wiring in your
vehicle. If the door switches are on the high side of the dome
light, modify the circuit as in Fig. 2-b. Power transistor Q6 may
be replaced with a 2N2222 if RYI's coil current is less than 150
mA. Mount relay RY I near the siren, bell or horn used with the
alarm. Any style of cabinet may be used but it should be
mounted out of sight. Wiring is not critical and I used wire -wrap
in my prototype. However, a circuit board or point-to-point
R -E
using a Proto -Board is recommended for strength.
PIONEERS OF RADIO
FRED SHUNAMAN
A.S. POPOV
THE PLACE OF PROFESSOR A.S. POPOV IN
the history of radio has been obscured to
some extent by rival claims of Marconi
supporters and by persons who insisted
that, because he was Russian, he could
not have invented anything important.
The facts that most people agree on are
that Popov, of the Russian Marine Academy at Kronstadt, described and demonstrated to the Russian Physical and
Chemical Society, on the 7th of May,
1895, equipment he had constructed to
study atmospheric electricity. It followed
the "state-of-the-art" of that time, using
a Branly coherer. But Popov added one
improvement. The original Branly coherer had a disadvantage-once its filings
had "cohered" on receiving a signal, its
resistance dropped and remained low,
paralyzing it until its filings were jarred
loose again. Branly and Lodge "decohered" it by striking the table with a mallet. Popov used the signal itself to
restore the receiver's sensitivity. Battery
current through the coherer also passed
through the coil of an electric bell, which
was so mounted that its clapper struck the
coherer on every backstroke. When a signal was received the bell rang and continuously decohered the tube of filings, producing an audible signal as long as the
radio waves continued.
Popov also used an elevated aerial wire
and Is credited by some with the invention of the antenna. However, earlier
inventors (Loomis, Dolbear) had used
aerials, and Edison had described elevated "condensing plates" in his radio
patent of 1885.
Although Popov designed his receiver
to study atmospherics, he checked its sensitivity with a spark transmitter. Using
the apparatus of Hertz, he said, "with a
sphere of 30 cm," he could actuate it at a
distance of 1 kilometer. With the apparatus of Bjerkness, "of a diameter of 90
cm," good results were obtained at a
distance of 5 km.
There is no indication that he attempted to transmit intelligence. But later in the year he suggested that a wireless
telegraph system could be established if a
powerful enough "oscillator" could be
made. In March, 1896, he did transmit
the words "Henri Hertz" a short distance-and taped the program!
In March 1897 a radio station was
established at Kronstadt under his direction, and he began outfitting ships of the
Russian Navy. On the 23rd of January,
1900, a message from St. Petersburg
instructed the icebarker Yermak to proceed to the rescue of a group of fishermen
on floating ice in the Gulf of Finland.
This was accomplished, and was probàbly
the first use of a radio transmission to
save life at sea. This work, incidentally,
was carried out with commercial equipment, made by the French instrument
maker Ducretet for the Russian Navy.
Like Hertz, Popov had a short life. He
R -E
died in 1906, at the age of 45.
D
BACKYARD
SATELLITE TV
RECEIVER
Part 6: The front end is critical if you build your own
satellite TV receiver. This issue we explore several
different approaches to making one that will work.
ROBERT B. COOPER, JR.
LAST MONTH, THE BASIC DO-IT-YOURSELF
satellite TV receiving system was described along with a novel spherical antenna system. This month, we'll look at
several approaches to building the front
end of the receiver.
Suitable LNA designs
The low -noise amplifier (LNA) decision depends largely on the mixing approach taken by the builder. As discussed last month, if you decide to use
a prepackaged passive double-balanced
mixer, such as the VARI -L DBM 500
unit, you will need more voltage gain
from the LNA than if you elect to use an
active GaAs-FET mixer. We'll show
both LNA approaches here: the bipolar
transistor system for use where 40 to 50
dB of gain is required, and the GaAsFET transistor system where approximately half as much gain is needed.
A few comments are in order for those
building microwave circuits for the first
time. Read them carefully.
Board material-Normal circuit board materials, such as the familiar G-10, are bad news at microwave frequencies. Any printed circuit board must be designed
for microwave applications. That
means a microwave -rated Teflon
dielectric board. Such board material is expensive but if you use
very small amounts of it, the per system costs will still be minimal.
2. Double-sided-Use only double sided board for all circuits, including those at baseband fre1.
quencies. IC and packaged active
devices used in this system, even
when operating at baseband
(video) frequencies, will oscillate
when given the opportunity. (One
recommended source for the
microwave region board material
that is used in the 4 GHz LNA
stages and in the local oscillator/
active mixer segments is the
Rogers Corporation. Box 700,
Chandler, AZ 85224. The board
material is Duroid grade D-5880
226-127; dielectric thickness is
0.031 inches, 1 ounce clad on
two sides.)
3. Grounds-All boards must be
perimeter -grounded. That means
all around, all four edges, both
sides. Spot grounds through
standup mounting lugs or pillars
are not adequate.
4. Lead length-Exceedingly short,
direct leads must be used with all
parts. Remember that at microwave frequencies even a 1/8thinch lead becomes an appreciable
portion of a wavelength.
5. Capacitors-All capacitors specified in the microwave portion
must be chip type. Normal ceramic, etc. capacitors have far too
much inductance at microwave
frequencies to be utilized. Where
RF chokes are specified, put
them in.
There are several sources for chip
capacitors suitable for this project.
One national source is Dielectric Labs,
69 Albany St., Cazenovia, N.Y. 13035.
Smaller quantities can be obtained
from Robert M. Coleman, RFD 3, Box
www.americanradiohistory.com
58-A Travelers Rest, SC 29690, and,
from Satellite Innovations, Box 5673,
Winston Salem, NC 27103. Where
some of the circuits here specify certain
brands of parts, such as capacitors,
look to the value of the device and then
locate a suitable substitute from the
sources just given.
Two -stage bipolar LNA
The workhorse amplifier in this service is described in Hewlett-Packard
Applications Note 967: a single -stage
bipolar amplifier using either the
HXTR-6102 or the HXTR-610l devices.
The 6102 is a better grade of the 6101
and it is capable of producing an LNA
stage with approximately 10-11 dB of
voltage gain in the 3.7 to 4.2 GHz range
with a noise -temperature of between
270° and 290° Kelvin (K). The 6101
tends to be 15° to 25° K "hotter. (In
this case, hotter is worse, not better!)
English experimenter Steve Birkill
TWO -STAGE BIPOLAR LNA is primarily an
etched circuit board with very tiny parts mounted in precise position.
TWO STAGE BI -POLAR LNA
+10VDC
BIAS ADJUST
R1
+10VDC
BIAS ADJUST
R3
QUARTER -WAVE
FEED CHOKES
MATCHING
NETWORKS
5052
INPUT
PARTS LIST
Two -stage bipolar LNA
Q1-HXTR-6102 transistor (Hewlett-
=
Cl
2.2pF
C12-270
C15
HXTR-6102
I270pF
T270pF
I270pF
OUTPUT
C12
C9
C5
C2
1270gF
COAXIAL
2.2 pF
02
HXTR-6101
2.2pF
01
J
lß.11 502
C8
FIG. 1-SCHEMATIC DIAGRAM of the two -stage bipolar low -noise amplifier. The shaded areas
represent leads and inductors that are vital parts of the circuit design.
VJ0805A2R2DF)
C2, C5, C9,
F
1
1
PLC
Packard)
Q2-HXTR-6101 transistor (HewlettPackard)
R1, R3-10,000 ohms, linear pot
R2. R4-10,000 ohms, 1/2 watt
Cl, C8, C15-2.2 pF (Vitramon
C13
4.7 p
2-1/2INCHES
pF (Vitramon
VJ0805A271)
C13-4.7 pF (Vitramon
VJO805A4R7DF)
C4, C7, C11, C14-1000 pF (Vitramon
VJO805X102KF)
PL1-SMA-type plug receptacle. tab
contact, flush dielectric. Selectro type
50-646-4575-31 (gold plated) or similar
J1-SMA-type jack receptacle, tab
C3, C6, 010,
contact, flush dielectric. Selectro
50-645-4575-31 (gold plated) or similar.
Note: SMA connectors from different
makers may be known variously as
SMA. SRM, RIM or OSM.
Microstrip board: 62.5 x 22.5 0.79 mm.
Duroid D-5880 226-127
dielectric constant 2.5, etched.
11""1"7"Piami
-Air+
FIG. 2-PATTERN for etching the top surface of the LNA microstrip board. The lower surface is
plain copper.
GROUNDING PINS SOLDERED
ON BOTH SIDES OF BOARD
CONNECTOR FLANGES SOLDERED
TO TOP AND BOTTOM OF BOARD
C5
C30
HOLE
CARRYING FEED
FROM BIAS
BOARD
0
01
BASE LEAD
C11
OUTPUT CONNECTOR
(SMA JACK)
1
C
M.
CIO
COLLECTOR
O
LEAD
C12
02
BASE
COLLECTOR
of Sheffield has developed a two -stage
circuit board using this device series
and it is shown in Fig. 1. A full-size
circuit board is shown in Fig. 2. The
opposite side of the board-which, as a
INPUT
CONNECTOR
ISMA PLUG)
OCG
C7
CO
C15
C8
C13
C9
C3
c
C14
i0
PL1
CONNECTOR
INNER TABS
SOLDERED TO
MICROSTRIP LINE
EMITTER LEADS CUT OFF CLOSE AGAINST
TRANSISTOR PACKAGE
FIG. 3-COMPONENT LAYOUT shows placement of the transistors and capacitors. The capacitors
are chip -type approximately 8 x 5 mm.
reminder, must be a microwave -rated
board-is solid copper.
TWO-STAGE HFET GaAs-FET LNA is similar in
design and almost identical in layout to bipolar
LNA two -stage device; primary difference being the substitution of HFET series transistors
for bipolars.
Following the components selection
guide given here and the construction
tips, there is nothing to the system in
the way of tuning or alignment. Ten
VDC is the operating voltage; the base
bias is adjusted with the 10K pots (one
per stage) for a total device current of
4 mA. There is no tuning other than
this; all resonant circuits are obtained
with the etched inductances and the
fixed capacitances shown.
Figure 3 shows a parts layout for the
same two -stage amplifier. The bias
parts (resistor plus pot per stage) can
be located on the backside of the amplifier circuit board. When constructed,
the board(s) must be mounted in a suitable microwave enclosure with suitable grounds all around as noted. The
amplifier is very stable, but not when
39
OUTPUT TO
MIXER
7552
LINK
1ST STAGE
2ND STAGE
INPUT FROM LNA
THIS INNOCENT-LOOKING DEVICE is capable
of producing +10 dBm of local oscillator signal
at 4 GHz! Avantek VTO 8360 is a mic7owave os-
cillator device totally self contained. It mounts
on full -foil side of board with pins (leads) ac-
CAN BE SAME
PIECE OF DU ROID
PC BOARD (.031)
FIG.
4-SCHEMATIC AND LAYOUT of
a
two -stage LNA amplifier designed by Robert Coleman.
2
7/16 INCHES
FIG. 5-PRINTED-CIRCUIT foil pattern for a single -stage low -noise amplifier. Two can be connected
in cascade for more gain.
operating at the end of several clip
leads as it dangles in space! One source
for microwave enclosures is Adams
Russell, Modpak Division, 80 Cambridge St., Burlington, MA 01803
Two-stage GaAs-FET LNA
If your approach is to follow the
active mixer design of Robert Coleman,
or you simply want a lower front-end
noise figure than is possible with the
HXTR bipolar series, then you can
build the two -stage Coleman HFET1101 amplifier. Figure 4 shows the
parts layout for the HFET-1101 amplifier. The HFET series of GaAs-FET
devices are also produced by HewlettPackard and a stocking distributor is
Hallmark Electronics Corp., Attention:
Paul Koeppen, 1208 Front St., Building K, Raleigh, NC 27609.
The HFET series of GaAs-FET's is
capable of producing noise temperatures in the 170° K region (2 -dB noise
figure). Like the bipolar HXTR series,
there is no tuning; the devices mount,
turn on, and have voltage (positive and
bias) supplies adjusted for optimum
performance. Again, you cannot do
that at the end of clip leads! The HFET
data sheets suggest an operating voltage of +4.5 VDC. Developer Robert
Coleman found that in the circuit shown
(the actual-size foil pattern for a single
stage is shown in Fig. 5.) the devices
tended to be unstable at that voltage.
By dropping the operating voltage to
+3.6 and applying a -3.0 VDC (adjustable) bias to the gate lead (as shown in
Fig. 6) he was able to make the stage
GAAS-FET
LNA POWERING/BIASING CIRCUIT
-3.0 VDC
5K
BIAS
VOLTAGE
4-
meter on the stage and keep an eye on
the satellite -delivered picture to optimize the stages involved. Start with
the first stage after setting both stages
to approximately 12 mA current.
Circuit boards are available for either
the Birkill bipolar (two -stage) amplifier or the single stage GaAs-FET device from Robert M. Coleman, RFD 3,
Box 58-A, Travelers Rest, SC 2%90.
The price is $25 on the Birkill two-stage
board and $15 on the single -stage GaAsFET board. A parts list is not included
for the GaAs-FET LNA since many of
parts are already listed for the bipolar
LNA. The 100pF capacitors are also
made by Vitramon and Q1 and Q2 are
Hewlett-Packard HFET-1101 transistors.
+3.6 VDC
1000 pF
0-50 MA
FEEDTHRU
1000 pF
FEEDTHRU
BYPASS
+
cessible on opposite board side with active
GHz circuits.
BYPASS
Cl
C2
1`100/35V
100/35V
r¡ --3
e
'12
GATE
G
NOTE:
L2=2 TURNS #36,0.1'
DIAMETER (RF CHOKE)
L1, L2, Cl, C2 ON UNDERSIDE
OF PC BOARD. 11,12 LEADS
PASS THROUGH HOLES TO
G1 TERMINALS.
L1,
6-HOW COLEMAN LNA IS BIASED AND
POWERED. RF chokes L1 and U are mounted
on underside of the board with leads anchored
In holes in the PC board.
FIG.
stable and optimize performance.
With all LNA stages (bipolar or
GaAs-FET) there should be a separate
bias control adjustment on each device.
With the HFET devices, maximum
gain occurs when the device current is
around 40 mA but optimum noise figure
occurs much lower; near 12 mA. Since
in this situation voltage gain is secondary to noise -temperature performance, you will need a method of
measuring the device current. Coleman's approach is to watch a current
The VTO local oscillator
Creating a +10 dBm-level continuous -wave signal source for the local oscillator can be a bit of a pain, especially
when the local oscillator must operate
in the 4-GHz region! Fortunately,
Avantek (3175 Bowers Avenue, Santa
Clara, Ca. 95051) has solved that problem with a neatly packaged device that
only requires board mounting (on
microwave pc board). The device requires connection of a +15 VDC supply
and application of a second + 10-to+20-VDC range tuning voltage. The
VTO 8360 device is virtually a perfect
local oscillator source for our applications since it tunes the range of interest
and while not inexpensive (in the $125
region) it is far less costly to use than a
lower-frequency oscillator chain with
multiplying techniques. And, as Murphy
notes, there is much less to go wrong
because everything is inside on a sub-
strate -designed package.
In Fig. 7 we have the complete local
oscillator ready to drive any mixer put
into service. The output pin four is
linked through an appropriate short
length of coaxial cable (if the length is
under 6 inches, virtually any 50- or 75 ohm coax will function; but you will
want to choose cable that will mate
with the SMA or other series fittings
you are using). Another approach is to
.031
NOTES:
DURDID
BOARD
RFC14 TURNS #28 WIRE, 1/8" DIAMETER
L1-6 TURNS #12 WIRE, 3/8" DIAMETER SLUG
TUNED TAPPED 2 TURNS FROM BOTTOM (SIMILAR
COILS IN RADIO SHACK COIL AND CHOKE PACKAGE)
L2-2 TURN OUTPUT LINK
Cl -SELECT TO MAKE LI RESONATE AT 70 MHz
CIRCUIT BOARD MUST BE DUROID (.031)
-4V
5K
10/10V
70
MHz
OUT
4 GHz
STRIP LINE
RFC1
I
270 pF
+10 TO
+20 VDC
GHz
AVANTEK VTO 8360
+15 VDC
VCO TUNING REGULATED
VOLTAGE
RG.
70 MHz
4
50 OHM
LOW LOSS
COAX (SHORT)
OUTPUT
Cl
INPUT
FROM
LNA
L2
2.2 pF
7-THE AVANTEK VOLTAGE-CONTROLLED
OSCILLATOR as it would be used as
cillator feeding a low-noise mixer.
a
local os-
use coaxial adapters to plug the output
of the local oscillator directly into the
appropriate input fitting on the mixer.
If you are using the VARI -L DBM-500
mixer (VARI -L Company, Inc., 3883
Monaco Pkwy, Denver, CO 80297)
your will need to build around the
10 TURN
HFET
VERNIER
CONTROL
1101
L
2476. Napa. CA 94558.
Satellite Digest-A
monthly publication providing
up-to-date circuits, hardware,
2. Coop's
and satellite operational news.
Mailed first class, widely read
as the insider digest of the
low-cost, private satellite TV
industry. Price in U.S. and
Canada is $50 per year ($75
outside, in U.S. funds); sample
copy for $5 in U.S. funds.
Order from: Coop's Satellite
Digest, P.O. Box G, Arcadia,
OK 73007.
3. Paul Shuch Satellite Lecture
Series Videotapes -Approximately eight hours in Beta or
47052
I
270 pF
=
5K
10 -TURN
HELIPOT
+4 VDC
+15 VDC
REGULATED
FIG. 8-A COMBINATION of the Avantek VCO and GaAs-FET used to make a tuneable
MHz converter using an active mixer.
Additional Satellite Material
Satellite television reception enthusiasts interested in learning
more about the fast developing
satellite TV industry and the options
available to persons building their
own home terminals may find some
of the following of interest:
1. Satellite Study Package-Designed to teach you how the
satellite TV system operates,
what the equipment requirements are, which services are
available, and to whom and
where. Includes a 72-page
book written by Bob Cooper
that explains in lay terms the
complete satellite TV scene,
plus a 22 x 35 inch four-color,
two-sided wall chart depicting the location and operating
characteristics of more than
30 geostationary satellites
carrying television programming. Shipped via first class
mail, price is $15 in U.S. and
Canada (in U.S. funds), $20
elsewhere from: Satellite Television Technology, P.O. Box
01
VHS format; world-reknowned
microwave teacher and satellite system engineer -designer
H. Paul Shuch takes the student through the entire satellite equation from antenna to
remodulated RF. Series originally videotaped at SPTS '79.
world's first international
seminar for low-cost satellite
TV terminals. Excellent learn-
ing tool, teaching tool. Price
rs $210 in VHS (LP) and $225
un BETA -2 in U.S. and Canada;
add $25 elsewhere from: Satellite Television Technology,
P.O. Box G, Arcadia. OK 73007
(405-396-2574).
4. SPTS '80/California-A threeday lecture series and exhibit
featuring noted satellite TV
low-cost terminal -developers
H. Taylor Howard of Stanford,
Oliver Swan. who developed
the Swan Spherical TVRO antenna, H. Paul Shuch of Microcomm, Robert Coleman of
South Carolina, and many
others. Combines classroom
learning of the latest state of
the art of satellite TV hardware,
plus the latest in marketing of
low-cost systems to private
homes, with commercial exhibits of hardware. More than
25 sessions in three-day period
with course learning materials. Next event will be held in
San Francisco Bay Area in
June of this year. For information, contact SPTS '80/California, P.O. Box G, Arcadia,
OK 73007 (405-396-2574). Admission by pre -registration
only, limited capacity.
4
GHz -10 70-
"standard" microwave SMA fittings.
Note that just as you don't use any sub-
stantial lengths of low -frequency (i.e.,
RG -8, etc.) coaxial cable at 4 GHz, you
also don't use fittings such as the UHF
type. Even the BNC type are at best
questionable in performance at 4 GHz,
although there are some type N fittings
"rated" to beyond 4 GHz. The proper
fittings and coax (for short interconnecting runs) can be located at Satellite
Innovations, P.O. Box 5673, Winston
Salem, NC 27103). What you are looking for is type SMA series connectors
and suitable coax to mate with the
SMA series fittings.
There is absolutely nothing to do
with the VTO 8360 local oscillator but
mount it and turn it on. The + 10 -to+ 20-VDC tuning voltage varies the operting frequency through the range of
interest (3.630 to 4.130 GHz). Once
again-make sure the VTO 8360 is
mounted on microwave circuit board
and is firmly seated into a housing before turning on.
Active Mixer
The most cost-effective approach to
the 4 -GHz front-end at the moment appears to be a marriage of two stages of
GaAs-FET LNA to the active mixer
(plus local oscillator) shown in Fig. 8.
This is another Robert Coleman -developed circuit, using the HFET-1101 not
as an amplifier but rather as a singleended mixer. The 4-GHz energy from
the LNA stage(s) is coupled into the
gate of the HFET 1101. The 4 -GHz
range local oscillator signal from the
VTO 8360 is coupled into the same gate
through a coupling strip. The 4-GHz
pair of signals mix in the GaAs-FET
l'--
/-7
w(/_
ACTIVE MIXER USING HFET device along with
VTO 8360 (mounted out of sight on back side)
mounts in single container. Unit can mount outside, at antenna, if appropriately weatherproofed thereby running only 70 -MHz IF energy
down and inside (in low-cost 50- or 75 -ohm
coaxial cable).
delivered at the output in the
70 -MHz region. Inductor L1 plus capacitor C l determine the IF resonance.
With the value shown for L 1, Cl will
typically be around 5 pF. It is important
that the Q of this output section be kept
fairly low so that the full 30 -MHz bandwidth of the 70 -MHz IF signal gets out
of the mixer and into the IF amplifier
stages without being restricted. The 5K
pot in the -4 VDC bias supply lead is
adjusted for optimized performance
simply by looking at the picture on the
screen. This adjustment, plus the tuning voltage on the VTO 8360 are the
only two real adjustments that you
need to work with to get 4-GHz energy
down to 70 MHz! Inductor L1 tunes
broadly and can be optimized after the
satellite signal is received.
This portion of the system can be
tuned by using an MATV/CATV-type
field -strength meter tuned in the 70-to 80 MHz region-or, in a pinch, you can
actually run the 70 -MHz IF output into
a standard television receiver tuned to
channel 4. No, you will not recover
video (or audio); remember that the
satellite TV format is FM, and 30 -MHz
or so wide FM at that, and consequently the 4.5-MHz wide TV IF set up to
detect AM video modulation simply
can't recover usable video. But, the
TV receiver tuned to channel 4 can act
as a "tuning indicator" of sorts, and if
you happen to run across a transponder transmitting a static picture, such as
color bars or a slide, you may for a brief
instant even see something resembling
a picture.
The circuit-board layout for the active
mixer is available from Robert Coleman directly (address previously given)
and a complete board ready to mount
the parts on (including the VTO 8360)
2. is also available for $25.
P
There: Getting from 4 -GHz down to
cc
the 70-MHz IF was not all that difficult!
Next month we will look at the IF -tow
w baseband circuits, as well as the RF rea modulation back to a standard NTSC
format for direct viewing on a standard
a television receiver.
R -E
WHAT'S
1980 TV
and are
42
KARL SAVON
SEMICONDUCTOR EDITOR
HAVE YOU NOTICED THAT THE TELEVISION receiver power transformer has virtually
disappeared? Just two or three years ago
one of the features of the more "solid"
sets was the presence of that bulky, power -line isolating device. Today, design
economy and a greater use of power-supply technology have eliminated the power
transformer. Television tuners have also
emerged, dramatically changed, from
their mechanical infancy. Even many of
the small -screen receivers use electronic
tuners. The smaller sets tend to use the
potentiometer -programmed varactor
types first popular in the large-screen
sets, while the larger deluxe sets now have
"intelligent" tuning systems that smack
of space-age technology and bear the
fruits of microcomputer technology.
Those advances are found in both the
surviving American producers' sets as
well as the product releases of the Far
Eastern competition.
Deflection and
power -supply circuitry
Figure shows the merged horizontal deflection and power -supply circuitry of
the 1980 Sharp 19D82 chassis. That
receiver typifies the general circuit -design direction. The main chassis consits of
four integrated circuits (two more are
used in the tuning system) surrounded by
a relative sparsity of discrete components.
1
The set's schematic displays an unusual
neatness and simplicity for a color television receiver. Although the innards of the
IC's themselves are shown in Fig.
as
blocks, the schematic seems to lose many
of the mysteries that were inherent in the
esoteric, discrete designs of the past. It is
no longer necessary for manufacturers to
use every circuit trick possible to keep
costs under control.
This particular deflection sytem uses a
single IC that contains the sync separator,
horizontal oscillator, vertical oscillator,
high voltage hold-down (X-ray protection), and vertical preamplifier stages.
There is no fundamentally new functionality in the deflection structure, but rather a new kind of organization that supports a SCR -based regulator system. The
design eliminates the power transformer
by transferring its responsibility to the
horizontal -output transformer. In addition to the traditional pix-tube second anode and focus supplies, the horizontal output transformer drives the set's main
1
18-VDC low -voltage power supply
through D704, as well as the regulated
110-VDC power supply.
As a result of the SCR regulator circuit, all supplies energized from the
deflection transformer are regulated. One
interesting thing is that the 110-VDC
power supply feeds the horizontal -output
transistor and so is self-supplied. It's not
perpetual motion though, since all the
energy ultimately comes from the 170volt DC supply that runs from the AC
NEW IN
RECEIVERS
There are some interesting circuits behind the
color picture tube. Here's a look at what Sharp
and Zenith are doing this year
line. Besides the advantage of eliminating
the power transformer, the power supplies now operating at the 15,734 -Hz
horizontal oscillator frequency have reduced filter -capacitance requirements because of the higher frequency.
Regulator SCR701 is fed from line
rectifier diode D701 through a winding
on the horizontal -output transformer.
The regulator drive circuit varies the firing time of the SCR in the 63.5 -microsecond horizontal period so that the average voltage developed at the cathode of
the SCR is equal to the desired 110 -volt
regulated output. The SCR's conduction
time is determined by the interval between the arrival of the SCR gate turn -on
pulse and the turn-off pulse produced by
the horizontal -output transformer winding. Regulator circuit Q701, Q702, Q703
is a DC comparator followed by a ramp level detector that determines the turn -on
point of the SCR. The regulator -output
voltage is divided down to 7.1 volts by
resistor network R708, R709, R710 and
Potentiometer R709 is the regulaR71
tor voltage adjustment for trimming the
output voltage.
Error amplifier Q703 compares the
divided output voltage to the 6.2-volt
Zener connected in series with the transistor's emitter. As transistor Q703's base
voltage tries to decrease, the transistor
conducts less. The actual determination
of the trigger point occurs at the moment
Q702 conducts. A winding on the horizontal -output transformer is connected to
the base of transistor Q702 through R7I8
and C709. This R-C network is an integrator that produces a sawtooth waveform at the horizontal frequency on the
base of Q702. The output current of the
error amplifier transistor is returned to
the l8-VDC supply through R716 and is
also connected to the base of Q702
through 8717.
In effect, the horizontal sawtooth
waveform is biased up and down in voltage as Q703 changes conduction. The
emitter of Q702 is returned to the reference Zener diode through D703 as a convenient bias point. Therefore when
Q702's base reaches about 7.7 volts, the
transistor begins to conduct. Exactly
when this point is reached depends on the
contribution of Q703.
Let's follow the regulator action in one
direction with the help of Fig. 2. If the
regulated supply tries to increase, for
example due to a reduction in the supply
load, the transistor collector current increases through R717, its collector voltage is reduced, and the bias level of the
horizontal sawtooth on the base of Q702
is reduced. Now the sawtooth crosses the
trigger level later in the horizontal cycle.
At the point that Q702 conducts, its output current is amplified by SCR driver
transistor Q701 and is coupled through
R712 and C708 to the SCR gate. The
action of the switched SCR regulator
results in good receiver performance over
a wide range of AC line voltage and supply load regulation.
Microprocessor tuning
Zenith's 1980 color TV line also uses
electronic voltage regulation; the use of
magnetic voltage regulation transformers
has been discontinued. But the most innovative new Zenith feature is the Keyboard Touch -Command electronic tuning
system. It is a microprocessor -controlled
frequency synthesizer that uses a phaselocked -loop to control the tuner's local
oscillator precisely. Closed -loop systems
compared to open -loop schemes never
require manual tuning by the viewer and,
in addition, are not subject to oscillator drift problems.
Figure 3 shows the system block diagram. The microprocessor receives command inputs from the keyboard or remote
control that specify the channel to be
tuned. Along with the tuning algorithms,
the processor's read-only memory contains data that is used to convert channel
numbers to the necessary division ratio
required by the phase-locked -loop to produce the correct tuner oscillator frequency for the selected channel.
Two frequency -divider chains force the
local oscillator frequency to be a programmable ratio of a reference oscillator.
The loop creates whatever varactor tuning voltage is necessary to generate the
exact required frequency. Because the
frequencies extend into the 1000-MHz
region, which cannot be economically
handled by the lower frequency logic on
the programmable divider IC, a separate
43
SYNC
INPUT
TO VERT
HOLD
A
1202
iM
+18V
-0.6V
HORIZ
DEFL
COILS
r- r - l-
12.0V
TO HEIGHT
16
1.4V 14
15
2.8V 13
12
3.0V
11
820PF
10
CONTROL
9
I
I
SYNC
SYNC
GATE
REGULATOR
SEP
220pF
VERT
tÌÌóÌ)
I
K2
ö
C14
jtl
i
OSC
(II_J
oTo'
SAW -TOOTH
WAVE OSC
PROTECTOR
I
I
L_
X-RAY
i
10082
T
47
.01
AFC
DET
4.3V
10056
47K
FLIP FLOP
& OUT
4.5V
1
2
3
0.V
0.8V 4
E_
VERT
AMP
5
2.7V 6
1.6V
7.7V
8
7
T
500pF
200V
7001
2SC1875/
TO VERT DRIVER
2SC1942
.-.
.0018
.0056
4752
1
'j'`
10pF
T100"
12K
18052
# 68052
e22K
v
50V7
2SC1569K/
2SC1514BK
HORIZ
DRIVE
75.0V
0.5V
e15k
1
1/2W
10K
1/2W
1
50V
+
I
.001
.001
2.21(18)
.001
500V
I/
`1
e56K
1/2W
.270
=
1/2W
.0027
500VI
r
Il'
11,..
OV
6.3K
1.2K
2W
3W
VN
t
10K
120V
15K
-1
I1
50
4.7
14
HORIZ
IDRIVE
ITRANS
1J
L
1.8K
47K
1/2W
1W
56K
I
.001
.01
1.4KV
10K
.0022
102
DAMPER
HORIZ OUTPUT
Wei
1
H
AND YOKE
39K
.47 +
*1052
4>-1(
FROM VERT OUTPUT
OV
e
I
Wh
6852
10K
1M
4752
1
v
\
/
TO PWB-8
Fig. 1 -HORIZONTAL DEFLECTION AND POWER SUPPLY CIRCUITRY of the 1980
Sharp 19D82 chassis. Schematic displays trend towards simplicity and increased usage of IC technology. Above
circuit
is remarkably simple, especially for a color-TV chassis.
dedicated divide -by -256 prescaler is necessary to do this job.
A 3.581055 -MHz crystal reference oscillator is divided down by a 14 -stage
counter to the 976.5625 -Hz reference
comparator input. For example, tuning to
Channel 2 requires a local oscillator frequency of 101 MHz. The total division
ratio from the tuner to the comparator
must be 103,424 to produce the 976.5625
Hz output. Taking into account the fixed
256 prescaler, the programmable divider must be set to precisely 404 by the
microprocessor.
The comparator produces a signal with
an average DC output that is needed to
tune the oscillator frequency so that the
output of the programmable divider is the
same as the reference -divider output frequency. While the comparator actually
produces variable -width pulses, the active
filter reduces the comparator output to
slowly changing DC. The active filter is
an amplifier with a low-pass frequency
characteristic. A clamp circuit prevents
the tuning voltage from going below 2.25
volts. Reversals in the varactor tuner frequency -versus -voltage curve could other -
TRIGGER
LEVEL
0702
BASE
VOLTAGE
-1
REDUCED
I
LOADING
I
II
II
SCR701
GATE VOLTAGE
FIG. 2 -SCR TRIGGER SIGNAL bias level is
altered to change the conduction angle of the
SCR and thus provide regulation.
wise cause a lockout condition.
Several features have been added to the
basic synthesizer system to make it practical in a television receiver. First, although the system has been chosen for its
precision and minimum of user intervention, there are some real -life situations
where tuning off the theoretically ideal
frequency is necessary. For example,
some MATV systems intentionally translate the received frequencies to nonstandard frequencies to prevent adjacent channel interference. Therefore a special
AFC mode can be switched in to initiate a
receiver search above and below the syn-
www.americanradiohistory.com
thesized carrier frequency until a signal is
found. To ensure that a sound carrier or
other nondesired signal has been found,
the system logic checks for the extremes
of the allowed tuning range and verifies
that a 60 -Hz signal is being generated by
the vertical sync separator. The special
AFC mode will capture signals that may
be as far as 3.25 MHz away from the
standard frequencies.
Second, the tuning system has the ability to tune CATV frequencies. When the
CATV-mode is selected by the viewer,
the twenty-three mid -band and super band CATV channels replace the lower
UHF channels. The high -UHF channels
are disabled. CATV channels A through I
and J through W become channel numbers 14 through 36. For CATV tuning
the system searches its programmable
divider -ratio memory for the data required to tune the CATV frequencies
instead of UHF. You can consider this
first cable-ready TV to be a 105 -channel
receiver (the sum of the 82 standard
channels and the 23 CATV stations).
The direct -access tuning system displays the channel number on a 2 -digit
+110VDC
18VDC
170VDC
.0047
500V
47
11ovOc
146V
25V
r---
/
001
D704
7500V
2W
2
33
# 68052
10
100V
110V
SOURCE
+
'
R712
0701
_
4
3302
SCR701
2SA854101/
2SA562(01/ 2SA673(8)
8.2V^10.1V
SCR DRIVE
HORIZ OUTPUT XFMR
INCL FOCUS CONTROL
.M
y
220K
; 1/2W
100
160V
C7081
.047
200V
1.8K
-W-18.0V1/2W
S
`
e11WSZ
R716
2.7K
t7
e 1K
R708
100K
0703
2SC1815(Y)/
R717
10K
R718
15K
2SC454(C)
ERROR AMP.
9.6V
17.2V
0703
C709
R709
1 KIB)
7.1V
5.1V
6.5V
N
__
+110V
ADJ
R710
6.8K
I0702
2SC1815(Y)/
II
1
L
.01
J
(
r
FOCUS
RA1
CONTROL
RA3
2SC454(C)
PHASE DET
+i 680
-y
RAS
200V
-
HV TO PIX TUBE
Lü68
500V1
Ä 0701
-
10W
W-
W
1
-F---1- J
FOCUS ELECTRODE
SECOND ANODE
RA4
TO PWB-G
TO PWB-G
--
R711
82K
1_0_
J
.01
-
J
--
1-a44.
117
VAC
4A
-o_v 0MAIN POWER
DEGAUSSING COIL
MAIN
CHASSIS
LED
DATA
STEERING
INPUTS
INPUTS
ENABLE
MICROPROCESSOR
& ROM
DRIVER
DATA
ry
PRESCALER
SPACE
256
PROGRAMMABLE
DIVIDER
COMMAND
14 STAGE
REFERENCE
COMPARATOR
DIVIDER 976.5625HzAPPROX.
1kHz
OFF
VHF
UHF
OSC
OSC
A
OSCILLATOR
3.581055 MHz
1-191
ACTIVE
FILTER
& CLAMP
CIRCUIT
TUNING VOLTAGE
VOL
VOL
V
I
CATV NORM SPCL NORM
AFC
BAND
KEYBOARD
-
by a microproFIG. 3 -ZENITH'S NEW TUNING SYSTEM is based on a phase -locked -loop controlled
tune 105 channels
cessor. The system features keyboard entry of channel information and ability to
82 UHF/VHF channels plus 23 CATV channels.
LED indicator which is driven by a BCDto -seven -segment decoder. Multiplexing
the digit information uses four BCD data
lines and a fifth lead to indicate which of
the two digits is valid at any particular
time while the set is on.
Keyboard channel entry is finalized by
pressing the ENTER button following the
channel -number sequence. This method
simplifies single -digit channel (2 through
9) selection by requiring pressing the
proper digit followed by the ENTER key.
Some other electronic tuning systems
require a zero to be entered prior to a
single -digit channel number. The system
is smart enough to retain the previously
selected channel upon an illegal channel
entry attempt.
Three transistor circuits are fed by the
microprocessor to control bandswitching.
One circuit switches between VHF and
UHF, a second between the low and high
VHF bands. The third circuit is enabled
when the super -band CATV channels are
selected. The lower -frequency CATV
channels are bandswitched by the standard low/high VHF circuit.
The 11 -button keyboard (0 through 9
plus ENTER) is scanned by three microprocessor outputs and five inputs that
R -E
sense any switch closure.
OTTO SLACK
WIRE -WRAPPING
IS THE WAY TO GO IF
your next electronics construction project
is not being assembled on a PC board.
There are several variations on the wire wrap theme and in the instruments used.
("Doc" Savage covered wire -wrap basics
in his article "Wiring Systems For Projects" in the August 1979 issue.) use
both the Vector Electronics Slit -N-Wrap
and the OK Machine and Tool Corporation's Just Wrap tools and wire for most
projects. The ideas expressed and demonstrated here are based on those systems.
However, even if you use other standard
wire -wrap tools (such as Vero Electronics
Wrap tool), you'll find that you're able to
apply my ideas.
1
Add space for easier wiring.
In wire -wrap layouts using normal
spacing, Vector's P183 forming and cutting tool is used to hold the loose end of
the wire while the wire -wrap tool is
anchoring the wire on the terminal post.
The P183-supplied with the P184 manual Slit -N-Wrap tool-has a sharp, metal
ii .
NIFTY
WIRE -WRAP TRICKS
Here's a look at a few tricks to make
wire -wrapped projects easier,
faster and sturdier
USING YOUR FINGER to hold the wire down
while turning it onto the post with the tool. You
never have to pick up or lay down your finger:
Notice the hot-melt glue holding down the wire
runs. If you have any wires that you're afraid will
get snagged and broken, or skuffed on a post
and shorted, hold them down in this manner.
TWO PROJECTS ARE SPLICED TOGETHER,
one being on the dark perf board and the other
on the light. Both projects were wire-wrapped,
but the "finger -distance" concept wasn't used
here. The tools shown from left to right are Vector's P160-4T1 powered and the P108 manual
Slit-N-Wrap tools, the P183 chisel knife and
forming tool, a needle nose and diagonal pliers,
and, finally, an O.K. Machine & Tool Co. hobby
wrap tool.
i
,8110 r
iweleseisur
99
,r
°.
x'
Éñ
-
BOARD LAYOUT with "finger -distance" spacing between rows. Too much room at the ends
of the IC's is wasted space. You don't need to
manipulate the wire there and the 0.2 -inch
spacing provides enough room to cross over
in-between rows. All wire in this series of photos is the older polyurethane -Nylon -coated
wire. If you use the Tefzel insulated wire, you
may find that you'll have to increase the end to -end distance between the sockets because
of its larger diameter.
DEMONSTRATION OF THE STRENGTH of a
splice. It is nearly as strong as a single piece
and it can be turned over and lifted in the same
manner.
SPLICING TWO BOARDS together using strips
of perf board. Use a No. 44 drill bit to drill the
holes and 2-56 X '.4 screws and 2-56 nuts.
MANUFACTURERS of tools and materials
OK Machine & Tool Corp., 3455 Conner St., Bronx, NY 10475:
CIRCLE 148 ON FREE INFORMATION CARD
WSU-30-Wrap/unwrap tool, $6.95, plus materials, accessories, boards.
JWK-6-Just Wrap kit, $24.95.
R-JW-Just Wrap wire, 50 -foot spool, $2.98.
Vector Electronics Co., Inc., 12460 Gladstone Ave., Sylmar, CA 91342:
CIRCLE 149 ON FREE INFORMATION CARD
MEASURING CORRECT DISTANCE between
the rows. The "finger distance" is 0.8 inches on
this board. You could also turn your finger to
manipulate the wire. Too narrow a distance will
slow you down and give you a sore finger.
P-183-Chisel knife and forming tool, $2.15.
P-180-Slit-N-Wrap tool, $25.00, plus materials, accessories, boards, kits.
P-160-4T1-Motorized handle, includes P-180 Slit -N -Wrap tool, $99.50.
Vero Electronics, Inc., 171 Bridge Rd., Hauppauge, NY 11787:
CIRCLE 150 ON FREE INFORMATION CARD
163-28300A-Combiwrap tool, $12.36, plus materials, accessories, boards, kits.
46
www.americanradiohistory.com
USING THE P183 FORMING TOOL and P180
Slit-N -Wrap tool. This board layout is poor.
Even if you must make your rows too narrow
and have to use the forming tool, lay them out
end -to -end. Extra room on the ends of the IC's
is wasted space because the room isn't needed
for your finger or the forming tool.
HOLDING WIRE -WRAP POSTS in place with
hot -melt glue. A wire run is also held down with
the glue. If you see a leaning post here, that's
because it was either glued that way or the post
is bent. These glued -down posts hold resistors
and transistors.
ARROWS POINT le the nuts on the bottom of
d
board holding the splice together. Notice that
there are no strips of perf board on the bottom.
That makes if, relatively easy to splice a board
near a heavily wired area.
F
t
* #*s '
Li
F
.l. Aoo
; i s` O t.
.',. i %-°,
-
_
e a4Qo
,....-,ee)A
s"..,ali .
*y' t'
-,t
i
.i
s
i
;r
d
.
er
Q
"`
0
.
it
"
à
:
°
' F+.'
x'
i
'
O
°"
v ,.
'
.},,i
`,
,
14,
+
,.
'`E xa
ei..
le r, ;
a,.
I
C11
P
. a
.i
Ȉ
.
`
l#'
..
s
isx
Air'
MORE USES FOR THE HOT -MELT GLUE GUN.
The two metal pots, the TO -220 regulator, the
bridge rectifier and the bottom electrolytic
capacitors are all held in place with hot -melt
glue. The advantage of hot melt in these examples is that it is fast, strong, and the components are removable with heat.
;
;
'
THE PENCIL POINTS to an area of wire -wrap
pins that have bent over in their holes from
handling. The posts themselves have not bent.
Some of those posts will fall out of the holes
when handled if the wire -wrapping hasn't been
completed on them yet.
THIS EPROM LOADER AND TESTER was built
using the "finger -distance" concept and hot melt glue to hold the wire -wrap and other posts
in place. It has been running for a year. It is
made almost exclusively with wire -wrap and
perf board. The big exception to this is the PC
board in the upper left-hand part of the photo.
The device contains 32 IC's, including three hex
readout chips plus the high-voltage power -supply board in the center, all wired with the wire wrap technique. This project is ready to be
mounted in an aluminum box with the perf
board on the plywood frame mounted in a hole
in the top.
chisel point on one end and a plastic piece
similar to a blunt screwdriver or alignment tool on the other. It is the blunt end
that is used to hold the wire and dress it
against the board when necessary.
I find the forming tool cumbersome to
use in some spots so I eliminate the need
for it by spacing out the IC's, transistors,
and other components on the perforated
board. The IC's are placed end -to-end
and spaced 0.2 inch apart in rows. The
rows are spaced "finger distance" from
each other. I usually space the rows 0.8
inch apart but it could be less depending
on the size of your finger and the available room. Now, instead of using the
forming tool you can use your finger to
hold the wire in place. I find that my
finger does a faster and better job. The
only disadvantage in using that technique
is the additional board space required for
your layout.
Expanding a wire -wrap circuit
Sometimes a circuit change requires
more space than is available on the perforated board. In other instances, two circuits must be tied together with a large
number of connections. You can use a
ribbon cable, but that is both expensive
and unnecessary. A better solution is to
butt -splice the two circuit boards together using strips of perforated board about
one-half inch wide. I use 2-56 X '/r inch
screws and 2-56 nuts.
You don't need splicing strips on the
bottom side of the board; the assembly is
strong enough without them. That makes
it relatively easy to splice two boards in
heavily wired areas.
Keeping terminal posts in place
A large, densely wired project requires
a lot of handling before it is completed.
The board flexes when handled by one
edge; that flexing action can loosen the
terminal posts. Some posts can loosen
enough to bend over in the holes; and
since most of the posts are installed
before you start wiring, they can fall out
if your wire-wrapping hasn't reached that
point. To eliminate the problem, use a
hot -melt glue gun and run a bead of glue
down each side of each row of wire-wrap
posts. (Adjacent rows of posts must be at
least one-half inch apart so you can get
the glue gun between them. Don't get
glue on the tops of the posts! It is a very
good insulator.) The end result is posts
that are anchored in place and will take all
the handling you have to give them while
assembling a large wire -wrap project.
You can also use a dab of hot -melt glue
to hold wires in place. Pots, and most other components, can also be anchored to
the perforated board using hot -melt glue
so they don't have to rely on circuit wirR -E
ing for support.
HARRIS
SEMICONDUCTOR
A
THE HA -2400 PRAM
DIVISION OF HARRIS CORPORATION
FOUR CHANNEL
OPERATIONAL
APPLICATION NOTE
514
AMPLIFIER
DON JONES
INTRODUCTION
COMPENSATION
HARRIS SEMICONDUCTOR'S HA-2400/HA-2405 FOUR CHANNEL
Operational Amplifier combines the functions of an analog
switch and a high-performance operational amplifier, and makes
practical a large number of linear circuit applications.
A functional diagram of the HA -2400 is shown. There are
four preamplifier sections, one of which is selected through the
DTL/TTL-compatible inputs and connected to the output
amplifier. The selected analog input terminals and the output
terminal form a high-performance operational amplifier.
Frequency compensation for closed -loop stability is recommended for closed-loop gains less than 10. This is accomplished
by connection of a single external capacitor from pin 12 to AC
ground (the V+ supply is recommended). The following table
shows the minimum suggested compensation for various closed loop gains, with the resultant bandwidth and slew rate. Obviously, when the four channels are connected with different feedback networks, the channel with the lowest closed -loop gain will
govern the required compensation.
SLEW RATE
GAIN, VOLTSNOLT
V' V-
GND
COMP
11
13
12
r-- ---o-o-o
9
NON-INVERTI NG
-I
1
8
ANALOG
7
SWITCH
ANALOG
INPUTS
-
CCOMP
COMP
pF
15
2
1
7
3
2
4
5
4
3
8
7
2
>9
0
>10
6
INVERTI NG
(TYPICAL)
(-3dB),MHz
8.0
8.0
8.0
6.0
5.0
40 GAIN
(TYPICAL)
VOLTS/µs
15
20
22
25
30
50
10
3
OUTPUT
4
O N
1
N
1
OUTPUT
(AMPLIFIER
INPUT
DIFFERENTIAL
PREAMPLIFIERS
DECODE/
CONTROL
16
15
14
DO
D
ENABLE
DIGITAL INPUTS
In actuality, the circuit consists of four conventional op -amp
input circuits connected in parallel to a conventional op -amp
output circuit. The decode/control circuitry furnishes operating
current only to the selected input section.
CIRCUIT CONNECTIONS
These inputs control the selection of the amplifier input channels in accordance with the following truth table:
DO
Di
L
H
H
L
L
H
OFF
H
H
H
L OR H
L OR H
L
OFF
OFF
ENABLE CHANNEL1CHANNEL2CHANNEL3CHANNEL4
0
OVSL5+0.8V
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
On
ON
+2.0V'= H'==+5.0V
The digital inputs can be driven with any DTL or TTL circuit
that uses a standard +5.0-volt supply.
Compensation capacitors of greater value can be used to
obtain lower bandwidth, greater phase margin and reduced overshoot, at the expense of a proportionately reduced slew rate.
External lead -lag networks could also be used to optimize
bandwidth and/or slew rate at a particular gain.
APPLICATIONS
Any circuit function that can be constructed using a conventional operational amplifier can also be constructed using any
channel of the HA -2400. Similar or different networks can be
wired from the output to each channel input pair. The device
can therefore be used to select and condition different input
signals, or to select between different op -amp functions to be
performed on a single input signal.
To wire a particùlar op -amp function to a channel, simply
connect the appropriate network between the two inputs for that
channel and the common output in the same manner as in wiring
a conventional op -amp. It is often possible to design with fewer
external components than would be required in wiring four
separate op-amps (see Applications 2 and 3). It should be
remembered that the networks for unselected channels may still
constitute a load at the amplifier output and the signal input, as
if the unselected input terminals were disconnected from the
network.
If offset adjustment is required, it can generally be accomplished by resistive summation at either of the inputs for each
channel (see Application 8).
The analog input terminals of the OFF channels draw the
same bias current as the ON inputs. The maximum differential
input voltage of these terminals must be observed and their
voltage levels must never exceed the supply voltages.
When the enable input is held low, all four input channels are
disconnected from the output. When this occurs, the output
voltage will generally slowly drift towards the negative supply.
If a zero -volt output condition is required, one channel should
be wired as a voltage follower with its positive input grounded.
The amplifier output impedance remains low, even when the
inputs are disabled; so it is not generally practical to wire the
outputs of two or more devices directly together. The compensation pins of two devices, however, could be wired together to
produce a switch with one output and more than four input
channels.
The voltage at the compensation pin is about 0.7 volt more
positive than the output signal, but has a very high source
impedance. Maximum current from this pin is about 300 µA,
which makes it a convenient point for limiting the output swing
through clamping diodes and divider networks (see Application
13).
Even if the application only requires a single channel to be
switched on and off, it is often more economical to use the
HA -2400 rather than a separate analog switch and high-performance op -amp. Unused analog channel inputs must be
grounded. Unused digital inputs may be wired to ground for a
permanent low input, or either left open or wired to + 5.0 volt
for a permanent high input.
Here are a few of the thousands of possible applications for
the Four Channel Operational Amplifier. These will give the
reader a general impression of how the units can be connected;
and probably will help generate many other ideas for applications. Also included are some challenges for the reader to modify the designs shown to perform different functions.
APPLICATION NO.
APPLICATION NO.
2
INPUT
DO
DECODE/ ID
CONTROL
DIGITAL
1
CONTROL
¡ENABLE
=i(
15pF
GND
COMP
O+15V
v 3
HA -2400
OUTPUT
AMP
o
3
V
- 3-0-15V
OUTPUT
2K
1K
50052
500 1'-
AMPLIFIER, NON -INVERTING WITH PROGRAMMABLE GAIN
This is a noninverting amplifier configuration with feedback
resistors chosen to produce a gain of 0, 1, 2, 4, or 8 depending on
the digital control inputs.
Comparators at the output could be used for automatic-gain
selection for auto ranging meters, etc.
Challenge: Design a circuit using only two HA -2400's that
can be programmed to any of 16 different gains.
APPLICATION NO. 3
INPUT
1
2.23 K
IN 3
DIGITAL
DIGITAL
CHANNEL
SELECT
IN4
-15V
15pF
2.67K
15pF
IN
CONTROL
1.77K
1
15V
IN
OUT
2
ANALOG MULTIPLEXER WITH BUFFERED INPUT AND OUTPUT
This circuit is used for analog signal selection or time division
multiplexing. As shown, the feedback signal places the selected
amplifier channel in a voltage follower (noninverting unity gain)
configuration, and provides very high input impedance and low
output impedance. This single package replaces four input buffer amplifiers, four analog switches with decoding and one output
buffer amplifier.
For low-level input signals, gain can be added to one or more
inputs to a voltage divider
channels by connecting the
between output and ground. Bandwidth is approximately 8
MHz, and the output will slew from one level to another at
about 15.0 volts -per -microsecond.
Expansion to multiplex 5 to 12 channels can be accomplished
by connecting the compensation pins of two or three devices
together, and using the output of only one of the devices. The
enable input on the unselected devices must be low.
Expansion to 16 or more channels is accomplished in a
straightforward manner by connecting outputs of 4 four-channel multiplexers to the inputs of another four -channel multiplexer.
Differential signals can be handled by two identical multiplexers addressed in parallel.
Inverting amplifier configurations can also be used, but the
feedback resistors may cause crosstalk from the output to unselected inputs.
(-)
OUTPUT
AMPLIFIER, INVERTING WITH PROGRAMMABLE GAIN
The circuit can be programmed for a gain of 0,
or
-1, -2, -4,
-8.
This could also have been accomplished with one input resistor and one feedback resistor per channel in the conventional
manner, but this would require eight resistors rather than five.
APPLICATION NO. 4
INPUT
z=soon
DIGITAL
CONTROL
15pF
+15v
600
2
OUTPUT
Z=
PROGRAMMABLE ATTENUATOR
6002
This circuit performs the function of dividing the input signal
by a selected constant (1, 2, 4, 8 or co as shown). To multiply by
a selected constant, see Application 2. White T, Ir or L sections
could be used in the input attenuator, this is not necessary since
the amplifier loading is negligible and a constant input impedance is maintained. The circuit is thus much simpler and more
accurate than the usual method of constructing a constant
impedance ladder and switching sections in and out with analog
switches.
APPLICATION NO.
APPLICATION NO.
7
DIGITAL
CONTROL
+15V
VIN
5
DIGITAL
CONTROL
+15V
15pF
OUT
INTEGRATOR/RAMP GENERATOR WITH INITIAL CONDITION
RESET
It is difficult in practice to set the initial conditions accurately
in an integrator. This usually requires wiring contacts of a
mechanical relay across the capacitor-leakage currents of solid-state switches produce integration inaccuracy. The scheme
shown above eliminates these reliability and accuracy problems.
ADDER/SUBTRACTOR
The circuit shown can be programmed to give the output
functions K, X, K, Y, (K, X + K4 Y), or K5 X
K6 Y.
Obviously, many other functions of one or more variables can be
constructed, including combinations with analog multiplier or
logarithmic modules.
This device opens up many new design approaches in digitally
controlled analog computation or signal manipulation.
-
-
-
-
APPLICATION NO. 6
Any oscillator that can be constructed using an op -amp, such
as the twin -T, phase -shift, crystal -controlled types, etc., can be
made programmable by using the HA -2400. Illustrated is a
Wien -bridge type that is very popular for signal generators,
since it is easily tunable over a wide frequency range and has a
very low -distortion sinewave output. The frequency-determining networks can be designed from about 10 Hz to greater than
MHz. Output level is about 6.0V RMS. By substituting a
programmable attenuator (Application No. 4) for the buffer
amplifier, a sinewave source for testing can be constructed.
Challenge: A high -Q, narrowband filter can be made by
feeding back more than one-third of the output to the negative
input. Design a circuit using the HA -2400 and an R -C network
that can be programmed either to generate or to detect an audio
tone of the same frequency. Such a circuit would be quite useful
for data communications.
Channel 1 is wired as a conventional integrator, Channel 2 as
a voltage follower. When Channel 2 is switched on, the output
will follow VIN, and C will discharge to maintain zero volts
across it. When Channel is then switched on, the output will
initially be at the instantaneous value of VIN, and then will
commence integrating towards the opposite polarity. This circuit is particularly suitable for timing ramp generation using a
fixed DC input. Many variations are possible, such as programmable time -constant integrators.
1
APPLICATION NO. 8
TRACK/HOLD
CONTROL
+15V
-15V
1
15V
OUTPUT
TRACK AND HOLD/SAMPLE AND HOLD
1
1
2aRC
DECODE/
CONTROL
C
+}
[
DD
+
1
D
ENABLE
COMP
GND
DIGITAL
(CONTROL
]
15pF
T-
V+ ]
HA
NV
2400OUTPU
o -15
V
p +15V
BUFFER
AMP
HA
I(
NO.327
LAMP
PROGRAMMABLE FREQUENCY SINEWAVE OSCILLATOR
www.americanradiohistory.com
V
2
-260I
50pF
T
Channel is wired as a voltage follower and is turned on
during the track/sample time. If the product of R X C is
sufficiently short compared with the period of maximum output
frequency, or sample time, C will charge to the output level.
Channel 2 is an integrator with zero input signal. When Channel
2 is then turned on, the output will remain at the voltage across
1
be constructed by adapting the circuit described in Application
Note 507 to the HA -2400.
APPLICATION NO.
11
DIGITAL
CONTROL
C.
An even simpler circuit can be made by wiring one channel as
an amplifier, choosing the compensation capacitor to yield the
minimum required bandwidth or slew rate. When the enable
input is pulled low, the output will tend to remain at its last level
because of the charge remaining on the compensating capacitor.
APPLICATION NO.
DECODE/
CONTROL
15V
'ENABLE
GND
COMP
Ç1
j
9
HA 2400
0
ñZ
y
Ir"
vAMP_15V
OUTPUT
INPUT
DIGITAL
CONTROL
OUT
PROGRAMMABLE ACTIVE FILTER
PHASE SELECTOR/PHASE DETECTOR/SYNCRONOUS
RECTIFIER/BALANCED MODULATOR
This circuit passes the input signal at unity gain, either
unchanged or inverted depending on the digital control input. A
buffered input is shown, since low source impedance is essential.
Gain can be added by modifications to the feedback networks.
Signals up to 100 kHz can be handled with a 20.0 -volt peak to -peak output. The circuit becomes a phase detector by driving
the digital control input with a reference phase at the same
frequency as the input signal, the average DC output being
proportional to the phase difference, with zero volts at ± 90°.
By connecting the output to a comparator, which in turn drives
the digital control, a synchronous full -wave rectifier is formed.
With a low -frequency input signal and a high -frequency digital control signal, a balanced (suppressed carrier) modulator is
formed.
Shown is a second -order low-pass filter with programmable
cutoff frequency. This circuit should be driven from a low source impedance, since there are paths from the output to the
input through the unselected networks.
Virtually any filter function that can be constructed with a
conventional op -amp can be made programmable with the HA 2400.
A useful variation would be to wire one channel as a unity gain amplifier, so that one could select the unfiltered signal or
the same signal filtered in various manners. These could be
cascaded to provide a wide variety of programmable filter functions.
APPLICATION NO. 12
DIGITAL
+VREF
CONTROL
APPLICATION NO. 10.
DIGITAL
CONTROL
LOAD
PROGRAMMABLE POWER SUPPLY
FREE -RUNNING MULTIVIBRATOR
FREQUENCY
WITH PROGRAMMABLE
This is the simplest of any programmable oscillator circuit,
since only one stable timing capacitor is required. The output
squarewave is about 25 -volts peak -to -peak and has rise and fall times of about 0.5 µs. If a programmable attenuator circuit
(Application No. 4) is placed between the output and the divider network, 16 frequencies can be produced with two HA 2400's and still only one timing capacitor.
A precision, programmable square -triangle generator can also
Many systems require one or more relatively low -current
voltage sources that can be programmed to a few predetermined
levels. It is no longer necessary to purchase a programmable
power supply with far more capability than needed. The circuit
shown produces positive output levels, but could be modified for
negative or bipolar outputs. Transistor Ql is the series regulator
transistor, selected for the required current and power capability; Circuit Rl, Q2 and Q3 form an optional short-circuit protection circuit, with Rl chosen to drop about 0.7 volt at the maximum output current. The compensation capacitor, C, should be
chosen to keep the overshoot, when switching, to an acceptable
level.
Challenge: Design a supply using only two HA -2400's that
can be programmed to 16 binary -weighted (or 10 BCD weighted) output levels.
APPLICATION NO.
.---
13
DIGITAL INPUT
M.S.B.
0
o
LS.B.
O
C
ANALOG
INPUT
p
N./
1K
DD
+
01
+
EN
;1K
GND
-
2448
+3
S2
v
D0
01
+15V
+15V
EN
o
o
GND
1362
COMP
COMP
l
1
1
V+
1K
OUT
HA -2400
V
-
OUT
o
-15V
1K
V+
1522
2
HA -2400
V-
OUTPUT
-0
o
-15V
17152
17152
152 S2
136 S2
24482
MULTIPLYING D -TO -A CONVERTER
This circuit performs the function, Vour = VIN X N/16,
where N is the binary number from 0 to 15 formed by the
digital input. If the analog input is a fixed DC reference voltage,
the circuit is a conventional 4 -bit D -to -A converter. The input
could also be a variable or AC signal, in which case the output is
the product of the analog signal and the digital signal.
The HA -2400 on the left is a programmable attenuator with
weights of 0, 1/4, 1/2 or 3/4. The HA -2400 on the right is a
noninverting adder that adds weights to the first output of 0, 1/46,
'/e or 3/.6.
If four -quadrant multiplication is required, place a phase
selector circuit Application No. 9 in series with either the analog input or output. The Do input of that stage becomes the + or
bit of the digital input.
-
APPLICATION NO. 14
DIGITAL
CHANNEL SELECT
+5V LOGIC SUPPLY
INPUTS
STROBE
68052
27052
FOUR -CHANNEL COMPARATOR
When operated open -loop without compensation, the HA 2400 becomes a comparator with four selectable input channels.
The clamping network at the compensation pin limits the output
voltage to allow DTL or TTL digital circuits to be driven with a
fanout of up to ten loads.
Output rise and falltimes will be about 100 ns for differential
input signals of several hundred millivolts, but will be in the
microsecond region for small differential signals.
The circuit can be used to compare several signals against
each other or against fixed reference voltages; or a single signal
can be compared against several reference voltages. A window
comparator, which assures that a signal is within a voltage range,
can be formed by monitoring the output polarity while rapidly
switching between two channels with different reference inputs
and the same signal input.
MORE CHALLENGES
One of our favorite college textbooks paused at each climactic
point with a statement to the effect that, "Proof of the following
theorem is omitted, and is suggested as an exercise for the
student."
The following
is a list of some additional applications in which
we believe the HA -2400 will prove very valuable. The "proofs,"
at present, remain as exercises for our ingenious readers.
A -to-D
Converter, Dual -Slope Integrating
Active Filter, State-Variable Type with Programmable Frequency and/or Programmable "Q"
Amplifier with Programmable DC Level Shift
Chopper Amplifiers
Crossbar Switches
Current Source, Programmable
FM Stereo Modulator
FSK Modem
Function Generators, Programmable
Gyrator, Programmable
Monostable Multivibrator, Programmable
Multiplier, Pulse Averaging
Peak Detector with Reset
Resistance Bridge Amplifier/Comparator with Programmable Range
Sense Amp/Line Receiver with Programmable
Threshold
Spectrum Analyzer, Scanning Type
Sweep Generator, Programmable
Switching Regulator
Touch -Tone Generator/Detector (Use Harris HD 0165 Keyboard Encoder IC)
FEEDBACK
We believe we have only scratched the surface of possible
applications for a multiple-channel operational amplifier.
If you have a solution for any of the previous "challenges" or
any new application, please let us know. Anything from a one word description to a tested design will be welcome.
R -E
Copyright G Harris Corporation, 1977
Courtesy of Harris Semiconductor.
Reprinted with permission of the copyright owner, Harris Corporation.
www.americanradiohistory.com
MACHINES
THAT CAN
TALK
There are several ways we can use electronics to
generate the sounds of human speech. Here's a look
at some of the schemes available today.
MARTIN BRADLEY WEINSTEIN
\SK ANY YOUNGSTER HOW THE NEW
talking toys like Speak & Spell (from
Texas Instruments) can talk, and
chances are you'll hear about the "little man inside." And, in fact, they
won't be far wrong. Every speech -synthesis scheme ever devised is based, at
some point, on a model of the human
vocal tract.
Let's take a look at the various approaches to speech simulation, beginning with the simplest, while keeping
an eye on the various tradeoffs. The
key requirements and parameters to
observe include circuit complexity,
memory requirements, system cost,
vocabulary size, fidelity of the resultant
speech, flexibility of the synthetic
voice, inflection, and software requirements. Those things will sort themselves out as we go along.
the new number is 555-0987." Those
interrupts (in all but the newest equipment) are recorded messages. but not
in the usual sense (see Fig. I ).
Only the minimum number of words
or phrases ever used are recorded, and
only once each. When an interrupt is
required, the telephone switching system alerts the interrupt subsystem to
start its sequence; the particular sequence that is required for any one
circumstance is programmed when the
need for an interrupt is entered into the
system.
Figure shows how multiple-track
tape recorders would be applied to the
task. But for quite some time now,
there have been no moving parts required; instead, the limited vocabulary
is converted to data and stored in
memory.
Recording and transmission media.
In the broadest sense, telephones
and tape recorders might be considered
speech synthesizers; after all, they are
not human, yet they speak with human
voices. Indeed, the telephone company
has used electronic -interrupt operators
for years-in fact, decades. They
prove an excellent starting point.
You may have experienced, while
dialing the number of a friend who had
just moved, a recorded message something like: "The number you have
reached, 555-1234, has been changed;
Crude digital speech
Figure 2 shows a very crude method
of recording and playing back speech
with digital memory.
The audio (speech) input is digitized
through a zero -crossing detector and
entered into RAM as the counter is
clocked through the cycle of addresses.
The playback operation exchanges this
"write" operation for a "read" operation, and every data change is heard as
a click from the speaker. The pitch of
that raspy, buzzy voice can be altered
by varying the clock frequency.
1
Experience with analog -to-digital
conversion methods shows the best
clock rate to be twice the highest desired frequency response, or about 10
kHz for 500 -5000 -Hz speech. This
means that a 16K RAM is only good for
about 1.6 seconds of speech.
This leads us to believe that in the
mathematics of electronics, at least,
the human voice may not be the best
model for providing a synthesis of the
human voice-a great deal of additional
number crunching will be required.
Our crude digitizer, by the way, can
be made quite acceptable if we expand
it to 8-bit -wide data words and include
an analog -to-digital converter at the input (replacing the zero -crossing detector) and a digital -to -analog converter at
the output. Lowpass or bandpass filters
at both input and output can further enhance fidelity.
Down the tubes
The approaches described so far can
reproduce not only any voice (with
varying degrees of success, depending
on the approach), but any other sound
within the same frequency range, including everything from music to
cacophony. Mightn't we trade some of
that versatility (which, by the way, the
human voice does not share) for data
economy?
A closer look at the human vocal
tract shows that it can be modeled as a
(NEXT GO TO
Al: THE NUMBER
A2:.
.
YOU HAVE REACHED
THE NEW NUMBER
B, 7
TIMES, AS PROGRAMMED)
..
IS...
(NEXT GO TO
B,
7
TIMES AS PROGRAMMED, AND EN
ZERO
THREE
SIX
SEVEN
HUNDRED
THOUSAND
IS NOT IN SERVICE
HAS BEEN
Al
Al
-
-B
B (7
- Cl - END (DISCONNECT).
- C2 -A2 -B (7 TIMES) END.
(7 TIMES)
TIMES)
CHANGED...
FOR NON -WORKING NUMB
FCR CHANGE IN LISTING
FIG. 1-GREATLY SIMPLIFIED RECORDED-LOOP TELEPHONE INTERRUPT "OPERATOR." Each
loop represents a multi -track tape player. Words within each band or track represent a pre-recorded message. Although the vocabulary is quite limited, it can be used for several trillion messages of
a limited nature. This system has recently been replaced by solid-state speech synthesis.
cylindrical tube, just under 7 inches
long. While muscles, air flow, tongue
and lip placement may vary the model
in detail, we are still primarily concerned with the fundamental acoustic
resonant frequency and its third and
fifth harmonics, called the first, second,
and third formants.
Think of those formants as harmonic
passbands or filters or resonators.
Typically, they would be near 500.
1500, and 2500 Hz, ± 50 % with modulation. Which is to say, any of the three
formants can slide up or down in frequency, depending on the geometry of
the vocal tract.
A complete model of human speech
must take in the "hiss" of fricatives
(like s, z, f, v and so on), aspiratives
(like h), nasal resonances (like n, m),
and stops (like k,p,t).
An excellent article by D. Lloyd
Rice of Computalker Consultants (821
Pacific Street #4, Santa Monica, CA
90405) appeared in the August 1976
issue of Byte. (A limited number of
copies may still be available through
either Byte or Computalker). Entitled
"Friends, Humans and Countryrobots:
Lend Me Your Ears," it follows the
discussion of the human vocal tract
through to a fairly comprehensive diagram of a digitally-driven speech synthesizer.
APPLICATIONS FOR
SYNTHETIC SPEECH
Handicapped aids
Production lines
Complex assembly operations
Simulators
Education aids
Games
Instrumentation
Pilot's aids
Telephone/computer services
Robots/androids
Appliances
Consumer products
Translational aids
Pronunciational aids
Rice's circuit, based on controlled
filters, is similar to one integrated onto
a single, high -density chip recently by
Texas Instruments-and used as the
heart of their Speak & Spell.
Input vs storage vs output
The advantage of switched-filter characteristic encoding versus the digital -to-analog converter technique is
that, since the analog electronic hardware pre -defines limits on a number of
crucial parameters, less data is needed
to define any given length of speech
message.
In the Speak & Spell synthesizer, for
example, a total of 48 bits in each data
"frame" defines amplitude, pitch, and
filter coefficients for a ten -stage digital
filter. For continuous speech, those
frames are updated at 50 Hz. This
means 2400 bits-per -second of speech,
versus 80,000 bits for the digital -to analog scheme, a 97% improvement.
By comparison, there's a series of
synthesizers available from Telesensory
Systems, Inc., that requires only seven
bits to define whole words. And TSI
synthesizers are priced between $95
and $179 standard models). The reason for all this economy is that the
TSI boards have fixed and very limited
vocabularies.
Their $95 model S2A, for example,
offers only 24 words. But since the
available words (in your choice of
English, German, or Arabic) are tailored for calculators (TSI builds those
boards for talking calculators for the
blind and people with impaired vision,
among other applications), the arrangement works out eminently well.
Phonemes
So why not, you may ask, break
language down into its basic soundsthe various vowel sounds (long and
short E, with a few in between, for example), consonants, combined sounds
like th, sh, ch, and so on-and put it
all into a limited "vocabulary" synthesizer?
You can. Those basic speech sounds
are called phonemes. But there's
something about the way we speak that
¿I RO
D
CRUssING
DETECTOR
MICROPHONE
CLOCK RATE
MESSAGE LENGTH
=
MEMORY LENGTH _ CLOCK RATE
2-CRUDE DIGITAL SPEECH RECORDER/REPRODUCER. During the write cycle-we will write
into the entire length of the memory-as the counter is clocked through the entire sequence of RAM
addresses. Each zero -crossing of any speech signal from the mike adds one bit of data to the
memory. On read, or playback, these data bits become pulses in the speaker. Increased clock
speeds enhance fidelity and intelligibility while it reduces the available message length.
FIG.
www.americanradiohistory.com
Manufacturers of Speech
Synthesis Hardware
Computalker Consultants
P.O. Box 1951
Santa Monica, CA 90406
Telesensory Systems, Inc.
3408 Hillview Avenue
P.O. Box 10099
Palo Alto, CA 94304
Texas Instruments
Consumer Specialty Products
Division
Lubbock, TX
24 -WORD CALCULATOR
MODULE VOCABULARY,
Telesensory Systems, Inc.,
S2A and S 16000 series
oh
one
percent
low
two
three
four
five
six
Over
seven
eight
nine
time -minus
equals
root
em (m)
times
point
overflow
minus
plus
clear
swap
Votrax
Division of Federal Screw Works
500 Stephenson Highway
Troy, MI 48084
by inflection, as we might expect, but
also by the "flavor" of the phonemes
makes those simple phoneme-rostering
synthesizers only marginally intelligible.
The specific pronunciation of a
phoneme, it seems, is altered not only
surrounding it.
Because of that, the software that
Consultants
Computalker
drives
phoneme-based CT-IT Speech Synthesizer, for example, first sets target
ADDITIONAL READING
Flanagan, J.L., Speech Analysis, Synthesis and Perception, 2nd Ed., Springer
Verlag 1972.
Markel, J.Q., and Gray, A.H., Jr., Linear Prediction of Speech, Springer Verlag 1976.
Erman, Lee, ed, IEEE Symposium on Speech Recognition, April, 1974, Contributed
Papers, IEEE Catalog # 74CH0878-9 AE.
Flanagan, J.L., and Rabiner, L.R., eds, Speech Synthesis, Benchmark Papers in
Acoustics, Dowden, Hutchinson & Ross, Inc., 1973.
Lehiste, Ilse, ed, Readings in Acoustic Phonetics, MIT Press, 1967.
Moschytz, George S., Linear Integrated Networks Design, Van Nostrand, New York,
1975.
Brantingham, Larry (Texas Instruments), "Speech Synthesis with Linear Predictive
Coding", Interface Age, June, 1979.
Rice, D. Lloyd (Computalker Consultants), "Friends, Humans and Countryrobots:
Lend Me Your Ears", Byte, August, 1976.
JOHN STONE
FRED SHUNAMAN
A FEW PIONEERS REMEMBER HIM WITH
respect, but the name of John Stone
Stone rings no bell with the majority of
today's engineers. Yet he was the per-
son who introduced exact science into
the communications art. The first to
work out his problems theoretically,
then verify his results by experiment,
he "could well, therefore, be considered
the progenitor and exemplar of the
communications research engineer of
today," according to the History of
Engineering & Science in the Bell System. He was early in the field-when
Marconi's tuning patent was declared
invalid in 1943 (indicating that he had
never had any right to the near-monopoly he enjoyed many years), it was on
the basis of "earlier work by Tesla and
John Stone Stone."
Stone joined Bell Labs as a graduate
student in 1890, and was assigned in
1892 to attempt "to transmit speech to
vessels at sea." He worked with a tiny
arc as "discharger" and a Tesla coil
Radio -Pioneer
resonating in the order of 50 kHz (receiver unknown). He was not successful-the trouble was that he was just
too far ahead of him time.
The same year, he suggested that
radio could be used for multiplex telephony by sending several messages over
the wires at different frequencies, then
sorting them out at the receiver end
with tuned circuits. Again, the idea
could not be carried out with the equipment of 1892, and, in fact, carrier telephony did not come into general use
until about 1915.
Stone left Bell in 1899 (still retained
as consultant and patent affairs expert)
to develop a wireless system that would
conquer interference problems with
"selectivity," a term he invented. After
early difficulties, the Stone Telegraph
and Telephone Co. made several successful installations for the Navy. He
also installed Stone equipment on a half
dozen ships and looked forward to successful business when the Navy let a
large contract in 1908. But the award
went to a competitor. and lack of in-
values for the centers of each string of
phonemes, then plots a smooth curve
through them (or near them) to produce a more natural sound.
In addition to their phonetic (phoneme-
based) software system, Computalker
offers a direct parameter control mode
requiring nine 8 -bit bytes at a 100 Hz
frame rate.
it isn't
easy-yet
Electronically, all the hardware
sophistication we'll ever need for completely natural synthetic speech is available today-and at reasonable prices.
But we're still not close enough to
having the software and firmware we
need to drive it. Work on that front is
progressing rapidly, with some good
news to report.
First, National Semiconductor is
rumored to be preparing a single -chip
speech synthesizer capable of accepting phoneme data (address) code and
needing little else to output natural sounding synthesized speech. The
good news is that it should be under
$30 or so; the bad news is that it will
only be available in mask -programmed
custom-vocabulary versions to large
industrial customers for the next year
or more. The news leaking out of Santa
Clara is hazy at this writing, but we will
advise you of coming developments.
Second, we may soon see an under $200, single -board microprocessor compatible phonetic synthesizer based
on a custom LSI IC in about two yearsvery available at the hobby level.
So the era of smooth synthetic talkR -E
ers should soon be upon us.
come forced Stone to sell his company,
to the de Forest Company.
Some of his trouble may have been
due to the very excellence of his equipment. Radio inspectors found his apparatus puzzling, and were suspicious.
All other systems showed a double
hump on their wavemeters-what now
would be called overcoupling. Stone's
had a single hump, obtained by using a
four-coil circuit. The usual coils were
used in the spark and antenna circuits,
but they were not coupled-between
them were two other coils, connected
together conductively. One of these
was coupled inductively to the spark
coil; the other was coupled to the
"aerial" coil.
After several years as a successful
consultant, Stone moved to California.
There, in 1920, he was engaged by
AT&T as engineer-at-large, living in San
Diego, with AT&T paying transportation whenever he had to come Fast.
Between 1920 and his retirement in
1934 he developed about 30 patents for
AT&T; the most notable of them was
probably the 3 -dimensional antenna
array, with antennas stacked above one
R -E
another for vertical selectivity.
55
www.americanradiohistory.com
03
L
D1
L
THUNDERSTORM
ALARM
Don't be caught unawares by the sudden arrival of a thunderstorm with its
accompanying wind and rain. This simple radio accessory gives an early warning.
CALVIN
R. GRAF
hM
THUNDERSTORMS, AND THEIR ACCOMPA-
flying strong winds, rain, and possible
hail, can make their appearance rather
suddenly sometimes. This is especially so
in spring and summer months, but they
can actually sneak up on you at almost
any time in some parts of the country.
When camping out, fishing, picnicking,
or just relaxing at home, it is important to
know of any severe weather that might be
approaching the local area. This is of special interest to those who have to conduct
outdoor operations such as construction
workers, farmers, and ranchers. Campers,
away from their vehicles, can be warned
to seek higher ground in case of flash
floods.
The thunderstorm activity indicator
described in this article will alert you to
an approaching electrical storm through
the flashing of two light emitting diodes
(LED's) and the sounding of an audio
alarm. The activity indicator is connected
to the earphone audio output jack of a
pocket transistor radio or connected
across the speaker terminals of any radio
receiver. The radio is then tuned to a
clear spot near the upper end of the
broadcast band (1600 kHz) where there
are no stations being received. An AC
power supply with 9 -volt DC output can
be used to operate the radio at home.
With this supply, the receiver can be left
on continuously and the receiver will consume little power but will provide an alert
no matter the time of day or night a storm
may appear. The AC-operated supply is
inexpensive and can be purchased at any
local radio store. A volume control is provided so that the audio alert level may be
adjusted or turned down completely. A
visual alert is still provided, however, by
the continuous flashing of the LED's as a
storm appears.
The circuit diagram shows how the
alarm is connected to the receiver. Transformer T1 is a small transistor radio
D1
R1
Ti
11
AUDIO 32n
INPUT (SEC)
ÌÌ
1N4001
37012
Z=
50012
hW
\\
MALLORY
LEDI"
SONALERT
(PRI)
"ANY GENERAL PURPOSE LED
FIG. 1-THUNDERSTORM ACTIVITY indicator and alarm. The audio input terminals are connected to
the speaker terminals of any AM broadcast radio receiver.
output transformer connected in reverse.
It is used to raise the audio voltage across
the loudspeaker (3.2 ohms) to a level that
will cause the LED's to operate properly
(500 ohms). Resistor RI serves as a current limiting resistor for the LED's so
that the voltage drop across them never
exceeds a nominal 1.6 to 1.7 volts. The
LED's are connected in reverse polarity
parallel so that one will conduct in the
forward (positive) direction of the audio
signal and other LED will conduct in the
reverse (negative) direction of the audio.
Diode DI is used to rectify the alternating audio voltage so that only pulsating DC is applied to the Sonalert as its
polarity markings must be observed. The
Sonalert emits a pleasant 2900 Hz signal
when the applied voltage is a nominal
volt DC. The capacitor charges up on the
sharp noise impulses that occur each time
there is a lightning flash. When the voltage across the capacitor rises to a value
close to one volt, the Sonalert will emit a
long "ping". The capacitor thus serves as
an integrator and stores up lightning
flashes before it causes the Sonalert to
sound forth. In this manner, short noise
transients on the power line that are radiated from light switches, air conditioners
and the like, do not cause the Sonalert to
sound. Output from the alarm is also
dependent on the setting of the receiver
volume control and it will sound out with
a normal room level setting.
When a thunderstorm is 10 to 20 miles
away, the audio output from the radio due
1
www.americanradiohistory.com
to atmospheric disturbances will cause
the LED's to flash and the Sonalert to
sound. As the thunderstorm approaches
the local area, thunder may be heard
following the "ping" of the Sonalert.
Knowing that sound travels one fifth of a
mile per second in air, the exact distance
to the storm area -can be calculated by
counting seconds from the time the ping
is heard until the thunder is heard. If you
count to five, the storm is one mile away,
and so forth. When the Sonalert sounds
continuously, the electrical storm and
accompanying rain are very nearby.
The approximate direction to the storm
can be determined by "aiming" the receiver's antenna toward the storm area
that produces maximum audio output
from the Sonalert. The storm passage
through the local area can be followed by
plotting the relative bearing against time.
Keep the volume level constant.
Remember, as the storm approaches,
light intensity of the LED's and the
sound duration from the Sonalert will
increase. As the storm recedes, the relative levels of both light and sound will
drop. The storm passage may last from 30
minutes to several hours. With a little
experience, you will soon learn to recognize whether it is going to rain or not, in
spite of what the weather man may say!
(If you live in the cyclone or tornado belt
consider using the Stormwarn alarm
along with a tornado alert device based on
light flashes on a blank TV raster.-Editor)
R -E
SUPER
CLASS r-11
Audio Amplifiers
New breed of Class A audio amplifiers for
hi-fi reproduction deliver high power and eliminates
nonlinearity in the driver stages
LEN FELDMAN
CONTRIBUTING HI-FI EDITOR
THE CHOICE OF WHICH "CLASS" OF AM-
plifier to use in high-fidelity applications
has always involved a series of trade-offs.
Most high-powered audio amplifiers use
Class -B circuitry, or Class -AB circuitry,
in which a slight amount of idling current
flows in the output -stage transistors at all
times. Class -AB power amplifiers provide
relatively high efficiency (around 60%
when they are delivering rated output,
lower efficiency at other output levels).
Their chief drawback, however, is that
they often produce crossover distortion
(also known as switching distortion)
when one transistor of the output pair
turns off and the other one turns on.
Figure illustrates the problem. The
sinusoidal trace is the output waveform of
a Class -AB amplifier that uses high-speed
bipolar transistors having fairly good
switching characteristics. The distortion
(mid -screen trace), measured on an average -reading distortion analyzer, is very
low: 0.0036%, which would certainly be
regarded as insignificant. Nevertheless,
the clearly visible spikes in the distortion waveform output that occur every time
the audio signal crosses the zero axis are
much higher in amplitude than is indicated in the average reading of the distortion meter.
What makes matters worse is the fact
that at the low listening levels more typically used, the crossover or switching distortion remains as great, and therefore
constitutes a higher percentage of the
total signal heard. Furthermore, because
of the nature of this type of distortion, it
consists of higher-order harmonics that
are subjectively more annoying to a listener than second- or third -order harmonic distortion components.
1
One way to eliminate crossover distortion completely is to operate the output
stages of an amplifier in Class A. In
Class -A amplifier circuits, the output
transistors conduct fully during the entire
cycle of the Input signal. A few highpowered Class -A amplifiers have appeared in the audio market but, as might be
suspected, they are extremely inefficient;
they generate a great deal of heat and are
generally extremely large and heavy, because of their tremendous heat -sink requirements and, often, their requirement
for self-contained fans.
Nonlinear amplifier stages
Distortion in an audio amplifier can
also result from nonlinear operation of
1-CROSSOVER DISTORTION is chief
drawback of Class -AB amplifier. Center trace
shows crossover distortion in relation to output
FIG.
signal.
voltage -amplifying stages that precede
the output stage, including the driver
stage. Figure 2 shows a typical poweramplifier circuit. The voltage gain Ay of
the voltage -amplifier stage is given by:
A,= gmXßXR.,
where gm is the transconductance of
www.americanradiohistory.com
FET's Q1 and Q2, ß is the DC current amplification factor of transistor Q3, and
load impedance RL is the combined impedance of the power-stage input impedance and the constant -current source 12 in
parallel with it.
In the above equation, it is ß that contributes the greatest nonlinearity in actual amplifiers. That can be understood by
examining the transfer curves shown in
Fig. 3 for a common -emitter transistor
amplifier stage. As the collector -to-emitter voltage varies from 13 volts to 28
volts, collector current varies from 100
mA to around 120 mA for a constant
mA. On the other
input current of
hand, if a common -base amplifier stage
could be used, the gain would be constant
regardless of the collector -to-base voltage
(see Fig. 4.)
As for the term ß in the gain equation
relating to Fig. 2, the maximum variation
of collector -to-emitter voltage Vc5 of
transistor Q3 will be 2VCC1, which is nearly identical with the power -supply voltage. So the nonlinear variation of ß due to
variations of VcE will be more than 10%.
Distortion can also be caused by nonlinear variations of the junction capacitance of semiconductor devices. In the
equation cited earlier, the gain was expressed for DC amplification only. Under
actual signal conditions, the collector-to base junction capacitance of transistor Q3
functions as a feedback capacitance. As
frequency increases, the gain Av decreases at a rate of 6 dB -per-octave. Since
the collector-to -base junction capacitance
varies depending on the base -to -collector
voltage in a nonlinear manner, it follows
that the gain also has a non-linear characteristic, thereby causing distortion in the
1
Output stage operation
OUTPUT
Ordinary class-AB output stages actually operate as Class -A stages over a limited range of low -output levels. When
that range is exceeded, one of the complementary transistors is cut off, with the
possible result of crossover distortion.
The cut-off occurs because bias voltage in
conventional Class -AB (or, for that matter, Class B) circuits is fixed. If bias voltage could be varied by means of some
additional circuitry, crossover and
switching distortion could be lowered or
eliminated and the circuit could operate
entirely in Class A but with improved
+VCC
I
I
VOLTAGE AMPLIFIER STAGE
POWER STAGE
2-AUDIO AMPLIFIER consists of
driver stages.
FIG.
power -output stage that is preceded by voltage -amplifying
a
OUT
250
mA
scc
200
1B4 =
cc 150
0
1
mA
1B3
0
=
.
=
0.75 mA
100
1132
T
50
=
0.5 mA
'B1
=
0.25 mA
of an input signal.
Figure 5 is JVC's new circuit that is
used in both the input and second stages
of some of their latest amplifiers. It uses
cascode amplification; in addition, "bootstrapping" is applied to the base of their
respective common -base circuits. In effect, this circuit combines the high gain
of a common -emitter configuration with
the high -linearity of common -base opera ti0n.
BASE
GROUNDED
IS
VCE
INPUT
.-i
-
CONSTANT
EMITTER
IS
GROUNDED
6-CASCODE CONNECTION. Upper transistor acts as a regulator and maintains the collector -to -emitter voltage and thus the gain of
the lower transistor constant.
FIG.
184
+Veci
0
10
20
30
40
1
50V
1B3 =
VCE(COLLECTOR CURRENT)
FIG.
0.75 mA
3-GAIN of common -emitter transistor cir-
1B2
cuit varies as the collector -to -emitter voltage
0.5 mA
varies.
1=
w
1B1 =
1E4=
400
mA
ó
0.25 mA
400 mA
CC
CC
--
mA
1E3 =
300
mA
0 10 20
300 mA
200
1E2 =
mA
200 mA
100
mA
1E1 =
7-LINEAR AMPLIFICATION and high gain
are obtained with JVC's cascode configuraFIG.
tion.
100 mA
0 10 20 30 40 50 60 70 80 90
3040 50 60 70 80 90 100
V CE (COLLECTOR -TO -EMITTER VOLTAGE)
0.3%
100V
VCB (COLLECTOR -TO-BASE VOLTAGE)
output -voltage waveform.
These two conditions that can generate
distortion are also present with the FET's
used in the input stage and can cause distortion of the input signal and the negative feedback signal.
JVC's new Super-A class circuit
What JVC calls their Super-A class
circuit is, in fact, a two-part solution to
the problems we have been discussing.
One circuit refinement takes care of the
nonlinearity problems of the driver stage,
while the second part is concerned with
the output stages and possible notch or
crossover distortion. We will examine the
circuitry relating to voltage -amplifier/
driver circuitry first.
To eliminate the nonlinear distortions
caused by variations in VcE (in a common
emitter circuit) techniques must be used
that maintain VCE at a predetermined value regardless of the presence or absence
20
-VCci
4-CONSTANT GAIN is obtained with
common -base transistor circuit.
FIG.
kHz/
ORDINARY CLA
B/
RIVER STAGE
0.1%
S
-A
0.05%
FIG.
5-JVC'S
1
NEW AMPLIFIER CIRCUIT com-
0.03%
bines cascoded amplifier stages and bootstrapping to provide both the high gain of a
common -emitter configuration and the linearity
of a common -base configuration.
A simplified diagram of the cascode
connection is shown in Fig. 6. When the
circuit is connected in this cascode fashion, the voltage of the transistor providing
the gain. (lower transistor) is frozen at a
constant value, resulting in constant gain.
The cascode connection thus combines
the characteristics of both the common base and common-emitter configuration,
as shown by the transfer curves of Fig. 7.
JVC claims that this driver circuit results
in reduced driver -stage harmonic distortion amounting to approximately 20 dB
of improvement at high driver-output
voltages. As proof, they measured distortion for a Class -A driver stage and for
their new Super-A driver stage. The
results are shown in Fig. 8.
www.americanradiohistory.com
kHz
l
0.02%
SI I PF R.A
DRIVER STA GE
20 kHz
0.01%
5V
10V 20V 30V
OUTPUT VOLTAGE
8-HARMONIC DISTORTION of conventional Class -A amplifier and JVC's Super -A
amplifier.
FIG.
VB
4
10
9-LOGARITHMIC COMPRESSION -BIAS
circuit varies the bias voltage of the output
stage in accordance with the output current.
FIG.
CONVENTIONAL
CLASS A
3,0
AMPLIFIER
JVC "SUPER
A"
AMPLIFIER
observed with an ordinary Class -A amplifier. At the 100 -watt output level, the
upper and lower waveforms are asymmetric and approximate the output waveforms that might be observed with a
Class -AB amplifier. The major difference, however, is in the important crossover area. With the new JVC Super -A
power stage, the nonlinearity in the crossover area is extremely gradual and contains much less of the higher -order distortion components.
As JVC points out, such gradually -produced nonlinearity can easily be eliminated or reduced to insignificant levels
with negative feedback.
The output waveforms of Fig. 10 suggest that the efficiency of the amplifier
using this new bias circuit might be comparable to that of Class -AB amplifiers,
but such is not the case at all. Figure
shows a comparison of efficiency between
amplifiers of different classes having the
same rated output (100 watts at 8 ohms
or 4 ohms). The ratio of output power to
maximum rated output power is plotted
on the horizontal axis while the ratio of
power loss to rated output is plotted along
the vertical axis.
As for the improved linearity of the
new circuit and the reduced "switching
distortion," one has only to compare Fig.
12 with Fig. 1, shown earlier. Once more:
The sinusoidal trace represents the amplifier's output (it is rated similar in power
to that shown in Fig. 1) while the center
trace represents what little residual distortion can be detected. The actual measurement of harmonic distortion for the
Super-A class amplifier was 0.0016%; not
all that much better than the 0.0036%
measured for the conventionally -designed
amplifier represented in Fig. 1. Note,
however, that there is no trace of the
switching spikes that were observed in
the other amplifier. JVC intends to introduce several integrated amplifiers in the
near future that make use of this new
R -E
circuitry.
1
CONVENTIONAL
CLASS
B
AMPLIFIER
FIG. 10-OUTPUT WAVEFORMS of new Super A 100 -watt amplifer. Waveform at 1 -watt output
level is shown in a; the 100 -watt output level is
shown in b.
efficiency. JVC's solution to this problem
is called a logarithmic compression-bias
circuit. The actual output stage uses a
pair of complementary output transistors.
The bias voltage is made to vary with output current in accordance with the curve
shown in Fig. 9. Using this varying characteristic of the bias voltage, the minimum bias voltage required to maintain
Class -A operation is obtained even when
the power transistors approach cut-off.
As a result, both high efficiency and
excellent linearity are claimed for the
new circuit.
Figs. 10-a and 10-b show the output current waveforms of the NPN and PNP
power transistors of a power amplifier
using the new bias circuit and having a
rated output of 100 watts -per -channel.
SOLID STATE NEWS
Speech synthesizer
The time when the computer will be
"humanized" seems to be drawing closer.
Texas Instruments has developed a
speech-synthesis IC using low-cost metal gate PMOS technology. The circuit is
called Speak & Spell when it is teamed
up with two 128K dynamic ROM's and a
version of the TMS 1000 microprocessor.
Each of the two ROM's stores the equivalent of over 100 seconds of speech.
Pitch -excited linear predictive coding
(LPC) is used to reduce the redundant
information in the human voice so that it
can be efficiently stored in semiconductor
memory. The method is based on a time varying digital filter that is modeled on
the vocal tract. An 8 -bit digital -to-analog
(D/A) converter transforms the stored
1.0
0.5
0
OUTPUT POWER/MAXIMUM RATED OUTPUT POWER
FIG.. 11-POWER DISSIPATION vs. output pow-
er of conventional Class -A, Class -B and new
Super -A amplifiers.
FIG. 12-REDUCED CROSSOVER DISTORTION
with Super -A amplifier is shown in center trace
when compared to Class -AB amplifier as
shown in Fig. 1.
The waveforms were observed at two
ouput levels; watt and 100 watts.
At the -watt output level, the waveforms are similar to those that would be
1
1
digital information, processed through
the filter, into synthetic speech.
The digital filter has 12 input parameters, including 10 filter coefficients and
pitch and energy variables, that are stored
in the ROM's. Periodic filter input signals produce definite pitch sounds such as
vowels, and random input signals produce
noise -like sounds such as "s," "f," "t"
and "sh."
The 10 -stage lattice filter uses an array
multiplier, an adder coupler and various
delay circuits. The multiplier circuit acTwenty mulcepts two inputs every 5
tiply and accumulate operations generate
each speech sample up to 10,000 of which
are produced per second.
That such an advanced technique can
be used in a relatively low-cost product
such as the Speak & Tell learning aid
clearly indicates that the speech-synthesis
circuit will become a commonplace output device.
High -voltage SCR's
Raytheon has announced a breakthrough in semiconductor technology
with its silicon -controlled rectifiers
(SCR's). The CR303 planar technology
series has forward- and reverse -breakdown voltages up to 800. The devices
exhibit a room -temperature leakage of
only 100 nA and have a minimum gate
sensitivity of 10 µA. They are used for
such applications as appliances, timers,
solid-state relays, ignition systems and
motor controllers. Large -quantity prices
are between $.42 and $1.03, depending
on voltage ratings. Complete specifications are available from Raytheon TAG
Semiconductors, 43 Third Avenue, BurR -E
lington, MA 01803.
hobby corner
digital temperature sensor, a mosquito -repelling circuit,
plus other tid-bits.
EARL "DOC" SAVAGE, K4SDS, HOBBY EDITOR
A
A WHILE BACK I RELAYED A READER IN-
quiry for a mosquito repeller circuit.
Another reader, Steven Thomas of Sawyer AFB, MI, has come up with some
very interesting information.
Steve's research indicates that a frequency just above the range of human
hearing will repel both male (non -biting)
and female (biting) mosquitos. It seems
that they simply don't like frequencies
around 20 kHz.
Ri
2
t3 To
8.11
gV
SPEAKERoR
GARPNoNE
20 .n
Do any of you have a circuit you would
share with Bill and others? If not, what
can you come up with? Here are a few
ideas:
Start with a timer -555 or crystal and
a divider for greater accuracy. The timer
can drive four separate and independent
counter circuits controlled by four signals. The signals are derived from cadmium sulfide photocells, phototransistors or
light activated SCR's (LASCR). The
photo devices are buried beneath the finish line and activated by the shadows of
cars passing between them and an overhead light.
Now what do you say?
VHF converter
s00AF
iov
FIG.
1
The 555 oscillator circuit in Fig. is
Steve's answer to the mosquito problem.
Adjusting R2 will provide output frequencies from below 200 Hz to above 62
kHz. Neither parts nor construction
should pose any problem. The only possible difficulty is the miniature speaker or
earphone. Use a good quality one so that
it will produce frequencies on the order of
20 kHz.
With all the harmonics contained in
the output of this squarewave generator,
it should be effective if set anywhere near
the right frequency. I suggest that you
turn higher and higher until you can no
longer hear it and then experiment with
finer tuning while you are out in mosquito country!
Thanks, Steve.
1
Racetrack timer
Bill Wisel of Fallston, MD has sent in a
neat question. It seems that his Cub
Scout Troop enjoys the annual Pine
Wood Derby but the close heats sometime create "heat" between the contestants. What Bill needs is a simple circuit
to time each of the four lanes or, at least,
to show which car comes in first, second,
and so on.
Larry Tornow of Hewitt, NJ, has
joined a volunteer fire company and
needs an inexpensive monitor. He and the
other guys don't want to lay out big money for a scanner when they are interested
in only one channel.
Larry wants a "quick and dirty" way to
convert a transistor FM broadcast receiver to the low VHF band. How about it
you volunteer firemen, rescue squaders,
and others-send along a conversion.
Larry and your other fellow volunteers
will appreciate your help. Oh yes, while
you are at it, how about the high band?
Digital thermometer
Ken Pavlicek of LaGrange, IL has
come up with a great idea for a temperature sensor and thermometer circuit. Being digital rather than the usual analog
variety, it has several advantages.
Ken makes use of the fact that a diode's
+5V
54,011
*,%04-
4.1K
4
8
555
3
OUTPUT
5EN5oR
FIG. 2
www.americanradiohistory.com
resistance changes with temperature. His
sensor consists of two series -connected
1N914's and these are part of the circuit
of a 555 multivibrator. Wired as shown in
Fig. 2, the output pulse rate is proportional to the temperature of the diodes.
This output is fed to a simple frequency -
counting circuit.
Adjustment of the 1K pot is fairly critical and Ken suggests using a multi -turn
unit there. The use of a standard frequency counter may require a conversion formula to go from the reading to the temperature but you should be able to juggle
the resistor values to make the relationship a simple one.
Ken uses a counter based on the adjustable frequency of a 555 rather than a
crystal and, thus, can get a readout directly in degrees (F or C). In addition,
through the use of some presettable comparators, he controls both his furnace and
air conditioner with his thermometer
readout. I regret that space will not permit going into the entire circuit but you
have the heart of it. Thanks for sharing,
Ken.
Tide timing
Have you noticed just how popular the
subject of clocks is these days? A good
portion of Hobby Corner mail is related
in one way or another to clock circuits.
Here are a couple that you may find especially useful.
Reader Art Williams of Wilmington,
NC, is an amateur fisherman and keeping
track of the tides is important if he wants
to have the best chance for a big catch.
The "slow clock" circuit that appeared
here in Hobby Corner a few months ago
caught Art's eye.
He went in the other direction and
made a fast clock so that low tide occurs
at 00:00 and high tide at 12:00. Now he
can set the alarm in order to get down to
the beach to meet the fish-he hopes!!
There is no need to reset the alarm each
day as would have to be done on a normal
clock and referring to a tide chart is
unnecessary.
I won't give Art's circuit because it is
just like the one shown in the July 1979
issue. All he did was adjust the rate of the
oscillator until the readout matched the
tides.
If you don't need the alarm feature of
the clock IC, you can keep track of the
tides (or whatever) in a less expensive
way, too. A standard 555 timer circuit or
the fast -slow clock oscillator can drive a
counter and a couple of LED digits.
Thanks for the idea, Art.
Readout wanted
Pat Craddock of Navasota, TX is looking for a clock readout circuit that will
drive lamps or LED's with minute and
hour values. He would like to have four
-minute, one 5 -minute and five 10 -minute lamps indicating the time with a like
number to indicate hours.
Sounds like an interesting display
scheme with different color LED's and so
on. Can any of you help Pat with this
circuit?
One final (for this time) word on
clocks. Hold on to your hat as you read
about this next one. Don't try to tell me
that you and your fellow readers don't
have imagination!
1
140
Gets It All.
Unusual clock readout
Reader Hankinson of Downingtown,
PA wrote about a really different clock he
has constructed. Bob's readout consists of
a single vertical row of LED's-yep,
that's no misprint-one vertical row of
LED's. Bob didn't send his circuit but he
did send pictures of the readout including
a 32 -shot multiple exposure.
Let me see if I can explain how it
works. Imagine one of those "moving
message" signboards made of many light
bulbs on which letters and numbers move
from left to right. Now imagine that all
the bulbs are covered from view except
for one vertical line. Next, substitute fast acting LED's for the bulbs and speed up
the display. There you have Bob's readout!
There is a little trick to reading the
display. If you look straight at it, all you
see is a line of LED's. However, if you
scan across it at the right speed, it's right
there: 4 digits of the correct time complete with colon. It has to do with persistence of vision-the same characteristic
of your eyes that keeps TV, movies, and
fluorescent lights from seeming to flicker.
Now that's what I call an unusual display.
R -E
ELECTRONIC
SERVICE
"You think that's bad? That's nothing at all.
You should try turning it on when it's
plugged in."
We just knocked down the last reasons for not going digital in a
multimeter. Fast continuity measurement. And price.
Beckman's exclusive Insta -Ohms'' feature lets you do continuity checks
as fast as the analogs. And Beckman's superior technology and experience
let you own this beauty for such a reasonable price.
Of course you get a lot more. Like 7 functions and 29 ranges including
10 amp ac/dc current capability. 0.25% Vdc accuracy. In -circuit resistance
measurements and diode/transistor test function. Two years' typical operation
from a common 9 -volt battery. In other words, all the features you want in
one hand-held unit of exceptional good looks and design.
With 1500 Vdc overload protection, 100% instrument burn -in, plus
rugged, impact -resistant case, you're assured of the utmost in dependability and
long-term accuracy. You get a tough meter that keeps on going, no matter
how tough the going gets.
So visit your dealer today and get your hands on the DMM that does it
all. Or call (714) 871-4848, ext. 3651 for your nearest distributor.
BECKMAN
CIRCLE 20 ON FREE INFORMATION CARD
www.americanradiohistory.com
HITACHI
VIZnc,
PHILIPS
HICKOK
TRIPLETT
[FLUKE
New Portable Digital Capacitance Meter
MODEL
FLUKE
820
DIGITAL MULTIMETERS
Measures capicitance
from 0.1 pF to Farad
1
Resolves to 0.1 pF
Six functions
10 ranges for accuracy
and resolution
4 digit easy -to -read LED
Model 8022A:
display
The Troubleshooter
0.5% accuracy
Special lead insertion
jacks or banana jacks
Fuse protected
31/2
voltage
voltage
current
current
resistance
diode test
dc
ac
dc
ac
-digit resolution
0.25% basic dc accuracy
LCD display
Overload protection
Uses either rechargeable
or disposable batteries
Call For Our Price
Overrange indication
-
MDATA PRECISION
WIDE RANGING
from 199.9 pF full scale
(0.1 pF resolution) up to 1999 uF full scale, in
eight ranges...virtuaty every capacitance you'll
ever need to measure.
0.1%, 31/2Digit, LCD DIGITAL
CAPACITANCE
METER
FAST AND EASY TO USE
Direct reading,
pushbutton ranges. Just plug in and read.
Model 938
-
EXCEPTIONALLY ACCURATE
±0.1% basic accuracy.
-
-
Model 8020A:
The Analyst
Model 8024A:
The Investigator
provides
TOUGH AND COMPACT
Built to take rough
usage without loss of calbratbn accuracy. Fits
and goes anywhere; takes very little bench
space; allays handy for quick capacitance
checkout, matching, calibration, and tracking.
PORTABLE
Palm-sized, light -weight, cperates
up to approximately 200 hours on a single PV
alkaline battery.
EASY READING
big, clear, high -contrast
31/2digit LCD display, a full 0.5 high, readable
anywhere.
-
-
Outstard g measurement
capability and dependability. Outperforms
tvnecanstant meters, and even bridges costing
2 to 5 times as much.
RELIABLE
warranteed for 2 full years.
VALUE PACKED
$149
-
Seven functions
HICKOK
NEW
dc voltage
ac voltage
dc current
ac current
resistance
diode test
conductance (1/R)
LX304 DIGITAL MULTIMETER
FAST, EASY,
ONE HAND
OPERATION
31/2t)igit resolution
NEW
0.1
% basic dc accuracy
LCD display
Overload protection
Free
AVAILABLE NOW
8995
case
Two year parts
and labor warranty
New Low Distortion Function Generator
MODEL
Nine functions
dc current
ac current
resistance
diode test
conductance (1/R)
logic level and
continuity detect
temperature (K -type
thermocouple)
Selectable audible
indicator for
continuity
or level detection
31/2
-digit resolution
0.1% basic dc accuracy
LCD display
Overload protection
New Sweep/Function Generator
MODEL
3010
3020
Four instruments in one
Generates sine, square and triangle
waveforms
Variable amplitude and fixed TTL square
wave outputs
Peak hold on voltage
and current functions
dc voltage
ac voltage
package-sweep generator, func-
0.1 Hz to 1 MHz in six ranges
Push button range and function selection
Typical sine wave distortion under 0.5°-%
from 0.1 Hz to 100kHz
Variable DC offset for engineering
applications
VCO external input for sweep -frequency
tests
www.americanradiohistory.com
tion generator, pulse generator.
tone -burst generator.
Covers 0.02Hz-2MHz
1000:
1
tuning range
Low -distortion high -accuracy
outputs
Three -step attenuator plus
vernier control
internal linear and log sweeps
Tone -burst output is front -panel or
externally programmable
DORIC
LEADER
0
J
MS -15
PORTABLE
OSCILLOSCOPES
SUPER
SPECIAL
BATTERY OPERATED
j
DATA PRECISION
Non -Linear Systems
Non -Linear Systems
Single Trace 15MHz
Reg. price $349.
$299x5
MS -215
HICKOK 385X
500MHz COUNTER
Reg 49995
NOW 22995
LIMITED QUANTITIES
Model LBO -520
30 MHz Dual Trace
Dual Trace 30MHz
Dual Trace 15 MHz
Regular price $598.
Reg. price $465.
$49995
$39995
-
C
q
List Price
$1100
$87995
THESE 1980 B&K OSCILLOSCOPES
ARE IN STOCK AND AVAILABLE
FOR IMMEDIATE DELIVERY
for"
Scope with Delay Line
High Sensitivity.
Wide Bandwidth.
Single Shot Trigger.
P -D-A CRT.
5mV sensitivity facilities accurate signal viewing from low level sources.
Built-in delay line makes it easy to view the leading edge of a pulse.
no
Single shot trigger (CH -1, CH-2) captures transient phenomena
guesswork, no "double -takes".
-
Automatic Transistor Checker
4
ajl(PRECISION
MGDf
LTC -906
Lights Up. Sounds Of f. Measures.
Identities. Displays.
multipurpose. portable, transistor checker
automatically better for laboratory, shop
and school.
Checks transistors, FETs, diodes, good or bad
8 in or out of circuit.
Automatically tests a broad range of parameters
with simple. program on -off switches-no
confusing buttons or lead changes.
Automatically identifies Germanium or Silicon.
plus emitter base and collector.
LED display plus audible tone indicates
defective or good performance
A
1479
1477
1432
1476
1466
1405
Dual-Trace
Dual -Trace
Dual -Trace
Dual -Trace
Single-Trace
Single-Trace
30 MHz
15 MHz
15 MHz Portable
10 MHz
10 MHz
Absolute meter readout of DC parameters.
5 MHz
CALL FOR OUR
EARLY BIRD SPECIAL LOW PRICE
Instruments Corp.
Regular price $189
$159.95
J
THE TEST EQUIPMENT SPECIALISTS
TOLL FREE HOT LINE
800-223-0474
WEST 45th STREET, NEW YORK, N.Y. 10036
ADVA
212-687-2224ELEC
1"1111X54
new ideas
LED PEAKMETER
I
NEW IDEAS
WOULD LIKE TO SUBMIT MY LATEST
This column is devoted to new ideas,
project to your New Ideas column. I call
it the LED Peakmeter. It is a basic dot/
bar readout built around the new National LM3914 display driver. The circuit
also includes a peak detector that immediately drives the readout to any new
higher signal level and slowly lowers it
after the signal drops to zero. The readout
circuits, device applications, construction techniques, helpful hints, etc.
All published entries, upon publication, will earn $25 plus a Circuit Board
Holder, Standard Base and Tray Base
Mount from Panavise Products, Inc.
(See photo below.) Selections will be
made at the sole discretion of the editorial staff of Radio -Electronics.
is a moving dot or expanding bar display.
The diagram shows one channel of the
stereo LED Peakmeter shown in the photograph. All parts are easily obtained and
layout is not at all critical. Although not
absolutely necessary, I suggest trying the
470K
1/ß/b
P.
8+
lov
o
io
i
IN9I4
.01
Ni(
IOK
AK
LM386
3
5
h.....
2
4
3
1
14
LM3914
16
8
agree to the above terms and grant
Radio-Electronics Magazine the right
to publish my idea. declare that the
attached idea is my own original material and that its publication does not violate any other copyright. I also declare
that this material had not been previously published.
I
iS
17
16
IK
I
Title of Idea
circuit on a solderless breadboard before
hand -wiring to check delay time and to
match components in a stereo unit.
I used a spare piece of perforated board
as a template to drill holes for the LED's
in the project box's plastic front. A battery holder with four "C" cells is
mounted on the back of the box.
The circuit has other possibilities. It
can be expanded for a longer bar readout
if desired. Tapping five or more LED
Peakmeters into a frequency equalizer or
series of audio filters should give a unique
result. Physical layout of the LED's can
also be changed to simulate the action of
regular VU meters.
The bottom LED of each peakmeter
remains on with no signal at the input,
thus providing a pilot light for the unit.Wm. J. Cikas
Signature
Print Name
Date
Street
City
State
ZIP
Mail your idea along with this coupon
to:
New Ideas
"So, we'd save 25 cents on the steak here.
Now, how about the drinks?"
www.americanradiohistory.com
Radio -Electronics
200 Park Ave. South
New York, NY 10003
3IG 2/2"
new /i#
DISPLAY!
SOLID STATE
CLOCK/CALENDAR KIT
0101 Displays time of day, date or alternate between
both automatically. May be connected to 8 ohm
speaker for alarm clock. Operates from 120 VAC 60 Hz.
$49.95
DMM SELECTION GUIDE is a full -color, 6 -page
brochure describing the maker's complete line of
3% -digit DMM's. The brochure details features,
specifications and applications for all models;
specifications are written in standardized format
on one page. Also included is a description of a
solid-state temperature probe for use with analog
and digital multimeters, together with applications.-B&K-Precision, Dynascan Corp., 6460
W. Cortland St., Chicago, IL 60635.
CIRCLE 142 ON FREE INFORMATION CARD
SEMICONDUCTOR REPLACEMENT GUIDE, No.
X78-2, provides 239 pages of carefully selected
and matched semiconductor replacement devices and IC's. Cross-referencing has been com-
,
AUTO CLOCK CALENDAR KIT
More information on new lit is available. Use the
Free Information Card inside the back cover
MINIATURE JOYSTICK CATALOG, No. CAT MJ
78, contains 16 illustrated pages of miniature joysticks designed for laboratory, industrial or military applications. Includes full descriptions and a
list of environmental specifications for different
models plus detailed schematics.-Measurement Systems, Inc., 121 Water St., Norwalk, CT
06854.
CIRCLE 141 ON FREE INFORMATION CARD
Walnut case extra, $24.95
}
piled on an equal -to or better -than basis. The first
part of the catalog contains an introduction and
description of device usage, as well as sections
on symbols and nomenclature, device descriptions and index, specifications, case styles, etc.
The second half of the catalog contains the actual
listing of semiconductors with manufacturers'
numbers and replacement numbers side by side.
The price of the guide is $1.50.-Workman Electronic Products, Inc., P.O. Box 3828, Sarasota,
FL 33578.
TOOL KIT CATALOG, Tool Kits and Test Equipment, contains 27 pages of tool kits for the field
service repair and installation industry, as well as
special sections on medical electronics, instrumentation, computers, and test equipment. The
kits range from complex kits for repair of sophisticated equipment to simple kits for production
lines. Also included is a test equipment section
that offers a large selection ranging from inexpensive analog meters, through compact DMM's,
to portable oscilloscopes. Order form is included.-Electronic Tool Co., Claremont Ave.,
R -E
Thornwood, NY 10594.
CIRCLE 143 ON FREE INFORMATION CARD
'
0106 Displays either
hours and minutes,
month and day, or
seconds. Requires only
2 mA of current while
ignition is off. Also
operates on 9V
battery. Mounts easily
in compact two-inch
enclosure (Not included)
y
$29.95
$39.95 assembled
UNIVERSAL
DESIGNER
KIT
6100 Indispensable aid
to digital IC design.
2 pushbuttons, 2 readouts, 4 switch outputs,
8 LEDs, 2 generators,
2 counters, 5V supply pins.
Shown with CSC OT47S
Breadboard (not included)
SEND FOR
%p8
FREE
$39.95
$49.95 assembled
Add $2.50 per order
postage and handling.
-PAGE
CATALOG
PIRILLEIMI
14905 N.E. 40th Street, R-3
Redmond, WA 98052 (206) 883-9200
CIRCLE 25 ON FREE INFORMATION CARD
3 in 1 Wire Wrapping Handtool
Circuit
Boards
Eurocards
Special Offer
Prototype
Boards
Terminal Pins
Edge
Connectors
D.I.N.
Connectors
Card Frames
-Standard
Card Frames
100' of
30 AWG
Wrapping Wire
PLUS
-Custom
Card Frames
-Euro
Module
Systems
Card Handles
Card Guides
Plastic
Enclosures
Instrument
Cases
Accessories
Fan &
Blower Units
vero
FREE
100 ft. of Wrapping Wire S 3.65
Perfect for the engineer, experimenter, or
Wire Wrapping Handtool S 6.95
serious amateur who needs a high quality tool
Retail Value $10.60
for detailed wiring projects. This versatile tool
strips the wire, then wraps it around the stake
COST TO YOU ... $
or unwraps existing connections. PLUS-for
+ 50$ for postage
a limited time only we'll include, at no extra
When ordering ask for item R059 -9547E
cost, a free roll of our best wrapping wire.
171 Bridge Road, Hauppauge, N.Y. 11787 [516] 234-0400 TWX: 510-227-8890
6.95
CIRCLE 61 ON FREE INFORMATION CARD
D
n
_
CO
OD
0
65
service clinic
More on troubleshooting automatic brightness limiters.
tube. Now that's a somewhat simplified
explanation!
In this circuit as in Magnavox's circuit,
we have a voltage developed across a
resistor in the high -voltage return path.
As the beam current increases, this voltage should go more negative; it did not!
That point is screened on the board as BL.
The DC voltage on BL measured almost
+50 volts. (This voltage is not given on
any of the schematics we had. However,
you'll soon find out what it ought to be.)
When we monitored this point and
caused the fault to show up, the voltage
jumped to almost + 100 volts! The excessive beam current was causing a change in
the voltage, but it was far too much and
the wrong polarity. Now we analyze!
The first suspect was diode SC996.
This checked OK. The 1.0 µF/50V capacitor C996 was the next suspect. Odd
readings prompted us to replace it. Problem solved! Everything worked normally
and the DC voltage at BL dropped to
about + 10 volts. If I were you, I'd write
this in on my schematic; it is on mine.
The +50 -volt reading is a sure sign of
serious problems. After some discussion,
JACK DARR, SERVICE EDITOR
LAST MONTH'S SERVICE CLINIC WAS DE -
voted to troubleshooting an ABL (Automatic Brightness Limiter) circuit in a
Magnavox T-995-03 chassis. The symptom was raster cutoff. Coincidences
abound in our business; not more than ten
days later, I came across a Sylvania E21-3 chassis that displayed exactly the
opposite symptoms.
The raster flared up to maximum
brightness and the breaker tripped. The
high -voltage shutdown circuit didn't
work. The high voltage was not increasing
but was instead being pulled down by the
current overload. The symptom was intermittent. On scene changes in the program, it happened; turn the channel
selector from station to station and it also
happened. Apparently, the trouble was
being triggered by a small transient.
Checking voltages and a bit of judicious hammering on things got us nowhere. No bad solder joints, etc. I said
idly "This looks just like the last one, but
the symptoms are reversed!" At that
point I looked to the ABL circuit. This is
similar to the Magnavox in that the control voltage is developed by sensing the
voltage drop across a small resistor in the
high -voltage return circuit. Figure
shows the circuit; the sensing resistor is
R996, at the top of the schematic.
The voltage is clamped by a connection
to the +24 volt line. In normal operation,
the sensor voltage goes more negative
with rising beam -current. That bucks and
drops the voltage at the junction of R996
and R919. The lower voltage causes diode
SC918 to turn on and apply the lowered
voltage to the base of Q900, the Black
Clamp Amplifier. (This transistor controls black level of the video, and thus
determines brightness.) The change in
the collector voltage of Q900 varies the
base voltage of Q902, the Video Amplifier, and the direct coupling from here on
through the video amplifiers and outputs
reduces the beam current of the picture
1
TO CRT
TRIPLER
2ND
ANODE
1
oHVWINDING
w
TC996
6802
+24V
Y
SC996
2.2 K
Bl
220pF
R919
10K
VIDEO
BUFFER
E
R996
18K
+24V
0902
VIDEO
AMP
1K
SC918
5/50
39002
' 000
1.8K
D904
VIDEO
DRIVER
5652
r
10K 1500pF
)1
220
10K.
1
TO 10600
PIN 5
:
100152
2
2.2/50
15µH
VM
33K
0900
BLACK
CLAMP
CONTRAST
1K
NOISE
INPUT
FROM
IC400
1
1
15002
TO IC400
PIN
pTORG&B
n
+24V
VERTICAL
BLANKING
HO RIZ
BLANKING
2 K
BRIGHTNESS
RANGE
2K
BRIGHTNESS
CONTROL
+24V
FIG.
1
www.americanradiohistory.com
'
SERVICE
*6.8K
22052
o
DRIVER
2.2K
we came to the conclusion that C996 had
been leaking. That placed a shunt resis-
tance across the remaining capacitance
and the shunt diode. So, excessive current
caused the development of more voltage.
The shunt resistor across the diode developed a positive voltage. Any other interpretations will be welcomed and probably
agreed with! At any rate, whatever the
exact fault was, a replacement of C996
cured it.
Later, a curiosity check inspired a look
at the Sylvania service literature, especially their always -welcome Service
Notebook, from which Fig. 1 was taken.
A couple of similar cases turned up. In
one, the symptom was "raster cutoff."
Again the culprit was C996, but this time
it was open. (As with an open input filter
capacitor in any DC power supply, the
voltage goes down.)
Of course, there are quite a few things
that can cause this type of problem. For
example, leakage in the black clamp transistor, video transistor, or bad components in the low-level video circuitry. By
the way, the circuit and part numbers in
the E-21 chassis are the same in the E-20
chassis. So, if this type of problem shows
up in a E-20 chassis, check C996 and
family. As we said before, if the problem
is loss of control of the brightness, scratch
around in the circuitry that's supposed to
be controlling it. For example, in this
chassis, note that the brightness -control
voltage is actually going through Q900.
So, any defects in this area can cause
problems. Keep your eyes open and look
R -E
at what's going on.
bypass capacitor that I'd replaced had
more leakage than the old one! A good
capacitor cured the problem, and now
everyone's happy.-M.C.B., Newport
News, VA.
SUBSTITUTE TRANSISTORS
I needed vertical output transistors for
a Sears 528.43600. Set went out late Friday evening. No parts available; so, I used
a
pair of Radio Shack transistors.
Worked, but couldn't get linearity to set
up at all. Checked all parts found nothing.
Got two new SK-3054 RCA's and put
these in and it worked. Question: Why?D.Y., Lexington, NC.
Crystal -ball answer: Most likely thing,
Only VIZ bench DMM's
ALWAYS CHECK NEW PARTS
I wrote in February 1979 asking about a
Zenith model 16Z8C50 with very low
screen -grid voltage on the 6LB6 horizontal output tube. You suggested I
check to make sure that the plate of the
tube wasn't open, since an open plate can
cause this symptom.
Since you've advised technicians for
some time to recheck any parts we put in,
I did. And I found that the "new" screen
PICTURE BENDING
Here's some feedback for you: You
mentioned checking the AFC diode unit
on an RCA CTC-72. Eventually, I did
this and found that both diodes were different in their forward resistance. What
threw me was that the brightness control
was affecting the bending. A new and balanced diode unit did the trick.-John
Conti, Texas City, TX.
R -E
tell so much for so little
WHAT
LED
fiii
'C"C"1'
I.
/
AC or DC
DC
Sheer magic from
the Wizard of VIZ
I'
I'
''
1.111
LCD
.
W2lß?
Mill
LCD display
v
Autoranging
Vlz
WD -762
V
>HOWMUCH
I
Manual ranging
service
questions
HIGH -VOLTAGE PROBLEM
I checked everything you suggested on
high -voltage problems I had with a Zenith
model 25FC45, and it didn't help. A Zenith
technician told me to try changing tuning
capacitor C229, even if it checked out OK.
The parts supplier said that this was correct and that there was a new improved
type to replace the original. I tried the
new capacitor and it worked! I just
thought I'd pass this along, since it might
help others in the same fix.-Paul Schlie,
E. Northport, NY.
Thanks, Paul. It should help a lot.
the sub transistors weren't quite able to
handle the needed power output. Drive
them off the linear part of curve and
that's the reaction. Radio Shack transistors are pretty good from what I've
found.
$210
WD -763
arir
LCD display
I
$265
lrRi /BabRi
LED display
WD -760
$199.95
Eitte
Y-......,
r
WD-761
LED display
$255
These are all laboratory quality instruments for bench or battery use. Supplied with
AC adapter, spare fuse and deluxe probes. Features include:
. Fully shielded
Accuracy 0.1% DCV
against RFI
Full range hi or to power
Voltage ranges from
ohms, pushbutton selectable
10 amp AC or DC
See your local
VIZ
VIZVIZ
0.1 mV
to 1000V AC
&
DC.
distributor.
Mfg. Co., 335 E. Price St., Philadelphia, PA 19144
Over 70 test instruments in the line
CIRCLE 58 ON FREE INFORMATION CARD
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, a
digital logic probe and other
sophisticated testing
Send for the full color catalog in the electronics area of your choice-discover a// the
advantages of home study with NTS!
NTS also offers courses in Auto Mechanics,
Air Conditioning and Home Appliances. Check
card for more information.
gear to learn how to
localize problems
and solve
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 all 14
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 Audio Electronics, you'll be able to
assemble your own NTS/HEATH digital stereo
receiver with 70 watts per channel.
But no matter which program you choose,
NTS's Project Method of instruction helps you
quickly acquire practical know-how.
www.americanradiohistory.com
1.
Simulated TV Reception
4.
3.
Programs
In Consumer
Industrial tectronlcs
NTS Training
SCHOOLS
NATIONAL
TECHNICAL -TRADE TRAINING SINCE 1905
Resident and Home -Study Schools
4000 South Figueroa St. Los Angeles, Calif. 90037
,
NO OBLIGATION. NO SALESMAN WILL CALL.
APPROVED FOR VETERAN TRAINING.
1.
The NTS/Rockwell AIM 65
Microcomputer A single board unit
with on -board 20 column alphanumeric
printer 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 GR 2001 Digital Color TV (25" diagonal)
features specialized AGC-SYNC muting,
filtered color and new solid-state high
voltage tripler rectifier.
r
NATIONAL TECHNICAL SCHOOLS
4000 South Figueroa Street.
Los Angeles, California 90037
Dept. 206-030
Please rush FREE color catalog on course checked below
MicroComputers/MicroProcessors E Audio Electronics
E Auto Mechanics
Communications Electronics
Air Conditioning
Digital Electronics
Home Appliances
Color TV Servicing
Age
Name
Address
City
Apt
State
Zip
Check if interested in G.I. information.
Check if interested ONLY in classroom training in Los Angeles.
IL
More information on new products is available. Use the
Free Information Card inside the back cover.
NICAD DISCHARGE ANALYZER, Nicadalyzer,
restores and extends NiCad battery life via controlled deep -discharge during testing. The Nicadalyzer measures the battery condition by dis -
system incorporates a high -gain voltage comparator with an accuracy of ± 10 mV, and can be
used to test Motorola, GE and RCA NiCad batteries. Suggested retail price: $209.-Reliable Measurements Systems, Inc., 1947 N. MacDonald,
Mesa, AZ 85201.
RMS AC current from 50-1000 Hz and all DC
waveforms including SCR circuits. Unit comes
complete with batteries, carrying case and accessories. Price is $345.-Pacer Industries, Inc.,
704 E. Grand Ave., Chippewa Falls, WI 54729.
DESIGN -MATE CASES, models DMC-1 and
DMC-2, in blue plastic, feature a slope -front, an
aluminum baseplate, and mounting screws.
Available in other colors for orders of 1000 or
AMMETER, model 1800A, is an easy-to -operate
unit that checks both AC and DC currents. It
reads from 1 to 800 amperes with an accuracy of
1'/2%. Just clamp the lightweight tong around any
conductor smaller than 11/4 inches and read current on the remote digital display. Reads true
CIRCLE 153 ON FREE INFORMATION CARD
CIRCLE 151 ON FREE INFORMATION CARD
charging it through a constant resistive load and
monitoring the elapsed time and voltage. The
CIRCLE 152 ON FREE INFORMATION CARD
more. Model DMC- l measures 6.75 X 7.5 inches,
slopes from 1.5 to 3.25 inches deep, and weighs
11 ounces. Model DM -2 measures 5.5 X 6
inches, slopes from 1.5 to 3 inches deep, and
BATTERY -WRAP
WIRE WRAPPING TOOL
MODEL
BW-2630
POSITIVE INDEXING
ANTI-OVERWRAPPING
BITS AVAILABLE
FOR AWG 26, 28 & 30
BATTERY OPERATED
BATTERIES AND
BIT NOT INCLUDED
LIGHT WEIGHT
U
S
FOREIGN
PATENTS
PENDING
BW -2630
BT -30
BT -2628
RB -20
BATTERY -WRAP TOOL
BIT FOR AWG 30
BIT FOR AWG 26 & 28
TWO NI -CAD BATTERIES
$19.85
$ 3.95
$ 7.95
$10.75
'MINIMUM BILLING $25.00! ADD SHIPPING CHARGE 52.00! NEW YORK CITY I STATE RESIDENTS ADD APPLICABLE
CIRCLE
11 ON FREE
OK MACHINE & TOOL CORPORATION
3455 CONNER STREET, BRONX, N.Y. 10475, U.S.A.
TAX
INFORMATION CARD
PHONE (212) 994-6600
TELEX: 125091
weighs 7 ounces. Suggested retail prices: DMC-1,
$8.75; DM -2, $8.50.-Continental Specialties
Corp., 70 Fulton Terr., New Haven, CT 06509.
WHAT'S NEW
IN HOME
ELECTRONICS?
"REPLACEMENT SEMICONDUCTORS, a complete line of individually packaged replacement
components, including transistors, SCR's, IC's,
diodes, rectifiers, Zener diodes, etc., is available
CIRCLE 155 ON FREE INFORMATION CARD
outlet or car's cigarette tighter. Unit has a gate
time of 1 second and a sensitivity of 30 my RMS
up to 30 MHz. Timebase stability is 3 PPM from
68°F to 86°F. Comes complete with batteries,
antenna and test lead. Price is $90.-Soar Electronics, 200 13th Ave., Ronkonkoma, NY 11779.
DIGITAL MULTIMETERS, a line of four 3'/: digit
bench instruments, provide a choice of LED or
LCD display and either manual or autorange
selection. The units feature RF shielding, over -
CIRCLE 154 ON FREE INFORMATION CARD
for TV, audio and electronic equipment applications. The semiconductors are available from
nationwide distributors.-PTS Electronics, Inc.,
5233 S. Highway 37, Box 272, Bloomington, IN
47401.
MULTIFUNCTION FREQUENCY COUNTER,
model FC -841, is a 7 -digit counter covering the
10 Hz to 50 MHz range. It features a tilt -view
stand, 0.3 -inch high LED readout, a switch for
selecting the kHz or MHz ranges. Supplied with 4
AA batteries, the counter can be plugged into AC
CIRCLE 156 ON FREE INFORMATION CARD
load protection, switching for high or low power
resistance measurement, auto -zero and auto polarity, and have an accuracy of 0.1%. The dis -
HOLD IT!
Anywhere you
Find out in the latest
Heathkit Catalog. It's filled
with exciting kits in every price
range, all easy to assemble, all
at build -it -yourself savings.
Discover the fun you and your
family can have building your
own home computer, stereo
system, color TV. Discover the
pride of saying, "I
built it myself."
It's easier than
want it.
you think.
Send today for
your FREE Heath kit Catalog.
PanaVise tilts, turns, rotates
One quick turn of the control
knob and you securely position
your work exactly where you
want it. Holds firmly but gently
the most delicate electronic
parts and P. C. boards.
Whether you're into building
home electronics, trouble
shooting, or professional servicing ... you'll wonder how
you got along without this mod
estly priced 'extra hand.'
Model 396 Wide Opening PanaVise
shown. An ingenious variety of other
interchangeable bases, holders and
accessories also available. See your
electronics distributor, or write
for FREE brochure.
D
:
Heathkit
If
coupon
is
missing, write
Heath Co., Dept. 020-632,
Benton Harbor, MI 49022
Send For FREE Catalog Today!
Send to: Heath Co. Dept. 020-632,
Benton Harbor, MI 49022
Send my free Heathkit Catalog now.
am not currently receiving your
catalog.
I
Name
Address
2850 29th St., Long Beach, CA 90806
CIRCLE 57 ON FREE INFORMATION CARD
City
State
CL-7248
Zip
CIRCLE 23 ON FREE INFORMATION CARD
BUILD A
MASTERPIECE OF SOUND
percussion and sustain. Wersi's famous
string orchestra and bass guitar. Exclusive Sound Computer for 32-128 "One
Stop Sounds" (total organ presets).
Transposer. And lots more.
Build your own masterpiece of
sound. No technical knowledge required. Just follow the clearly illus-
-
A
IIOtY/~-..
=
. `"'
-
trated, easy to understand instructions.
NEW PRODUCTS
continued from page 73
plays indicate the function as well as the value.
The models are designed for battery or AC operation, and a 6 VAC adaptor is supplied. All measure voltage from 0.1mV up to 1000V, ohms from
0.1 ohm to 20 megohms, and current from 0.1
microamp to 10 amps. Prices range from $199 to
$266.-VIZ Mfg. Co., 335 E. Price St., Phila., PA
19144
CHEMICAL AEROSOLS Kontact Clean and Kontact Restorer, are designed for cleaning all types
of contacts, switches and controls. Both remove
grease, dirt and oxidation and are safe for use on
painted and plated surfaces-even precious met-
Step by step. Choose from at least 10
models. (Also factory assembled.)
Send $6.00 with coupon for your Wersi
Demo -Package (LP with 104 -page color
catalog).
al
kontad
Çlean°
ii"
..,,,
OWERSI
.
Wersi has combined select features of
the electronic music field, added its own
creations and years of research by top
engineers and musicians, to produce an
incomparable line of organs.
Space-age technology. True-to-life voicing with full drawbar system. Polyphonic
Wels, Electronics Inc
Dept 21
Wersi Organs
1720 Hempstead Road
Lancaster. PA 17601
14104 E. Firestone Blvd.
Dept
&
Kits
RE380
21
Santa Fe Springs. CA 90670
Enclosed is $6.00 for my Demo -Package (LP with
104 -page color catalog.)
Name
Address
City
L
CIRCLE 22 ON FREE INFORMATION CARD
State
Zip
CIRCLE 157 ON FREE INFORMATION CARD
al. Kontact Restorer will also provide protection
against wear through a lubricant coating left on
the sprayed surface. Available in a 6 ounce can at
a suggested retail price of $1.39 and in a 16
ounce can at $2.30.-Chemtronics, Inc., 681 Old
Willets Path, Hauppauge, NY 11787.
R -E
INTERNATIONAL FM-2400CH
FREQUENCY METER FOR
TESTING MOBILE TRANSMITTERS
AND RECEIVERS
PTS
8001
Component
Analyzer
Portable Solid State Rechargeable Batteries
Z
CAL
VERT
HORIZ
.,G
The FM-2400CH provides an accurate frequency standard for testing
and adjustment of mobile transmitters and receivers at predetermined
frequencies.
cies of the receiver between 5 MHz
and 40 MHz.
The FM-2400CH with its extended
range covers 25 to 1000 MHz.
Frequency stability with built-in thermometer and temperature corrected
charts:
00025% from +25° to
+ 125° (.000125% special 450 MHz
crystals available).
The frequencies can be those of the
radio frequency channels of operation and/or the intermediate frequen-
Solid state component tester works in or out of
circuit. Simple hook-up to any standard
oscilloscope. High, medium and low range
switch for matching the impedance of the
component being tested.
'
Frequency stability: -+.0005
+
50' to
+
104°F.
from
Tests Predetermined Frequencies 25 to 1000 MHz
Extended Range Covers 950
MHz Band
Pin Diode Attenuator for Full
Range Coverage as Signal
Generator
Measures FM Deviation
Dealer Net $54.95
See the Yellow Pages for the Stocking Distributor or
PTS Servicenter Nearest You.
FM-2400CH (meter only)
$690.49
RF crystals (with temperature
correction)
$28.89 ea.
RF crystals (less temperature
....P)ÚS
BBB
Iiiu
correction)
$21.92 ea.
crystals
catalog price
IF
.uu.ue
s.u.us.u2
Write for catalog
PTS ELECTRONICS, INC.
The Only Name You Need To Know
P.O. Box 272
Bloomington, IN 47402
812-824.9331
UI
10 Neon Lee
CIRCLE 64 ON FREE INFORMATION CARD
=lLiud
NTERNATIONAL CRYSTAL MFG. CO.. INC.
Oklahoma Cay
CIRCLE 51 ON FREE INFORMATION CARD
Okla
13102
More information on stereo products is available. Use the
Free Information Card inside the back cover.
DIRECT -DRIVE TURNTABLE, model PS -X60, is
an automatic turntable with a Luminous Sensor
feature that tracks the runout record grooves
by a quartz -crystal -referenced phase comparison
circuit. The tonearm measures 91/. inches and is
calibrated for height, tracking force and antiskating; the base contains a holder for an extra head shell. The model PS -X60 measures 6% H X 181'/,6
W X 16'/,e inches D, and weighs 26 lb., 7 oz. It
retails for $400.-Sony Corp. of America, 9 W.
57th St., New York, NY 10019.
CIRCLE 131 ON FREE INFORMATION CARD
electro -optically. The turntable has a brushless,
slotless motor, and speed is controlled by a magnetic coating on the outer rim of the platter and
CONDENSER MICROPHONE, model SM81, features a 3-position low -frequency response switch
to provide flat response, a low -frequency rolloff
of 6 dB -per -octave below 100 Hz, or a cutoff of 18
dB -per -octave below 80 Hz. The microphone also
has a built-in switchable 10 -dB attenuator to protect against overload. The model SM81 operates
over a wide range of simplex power supplies
including the DIN 45-596 standard 12 volts and
48 volts. The unit comes with a windscreen, swivel adapter and attenuator lock. Optional accessories available are the model PS -1 and model PS -2
simplex power supplies, a heavy-duty windscreen
(model A81WS), a microphone adapter (model
A27M) and a 14 -ft. mike stand (model S15). The
model SM81 weighs 8 oz. and measures 8"/32
CIRCLE 132 ON FREE INFORMATION CARD
inches long. Suggested retail prices: the model
SM81, $225; model PS -1, $105; model PS -2,
$126; model A81WS, $17; model A27M, $20.10;
and model S15, $81.-Shure Brothers, Inc., 222
Hartrey Ave., Evanston, IL 60204.
CIRCLE 132 ON FREE INFORMATION CARD
CAR STEREO AMPLIFIERS, Linear Power model
60A and model 40A, can be connected to the
speaker outputs of any car stereo. The model
60A (shown) delivers 30 watts -per -channel minimum RMS into 4 ohms, 20 Hz -20 kHz with no
more than 0.25% (0.1% typical) THD. The model
40A delivers 20 watts -per -channel minimum RMS
continued on page 76
Price Without Sacrifice.
V302
MED
&V152
HITACHI
Put a proven Hitachi dual -trace oscilloscope on your bench
for as little as $695. Our V-152 15MHz model includes unprecedented sensitivity (1 mV/div.)...10X sweep magnification...front panel XY operation...trace rotation...Z-axis
input...and more. Need greater bandwidth? Our V-302
model is the only 30MHz dual -trace scope with signal delay
line priced under $1000, with all the above features, to
make your testing operations fast, easy, and accurate.
Reliability is exceptional, too. (As you'd expect from a
manufacturer with over 20 years of experience "outscoping" the competition.) So exceptional, in fact, that Hitachi
quality is backed by a 2 -year warranty...the longest in the
industry. Whether you use it for teaching or repairs, for
video, audio, or computer testing, you can't find more
scope for your dollar than at Hitachi. Write for more details.
Hitachi...The measure
of quality.
V-152 15 MHz Dual Trace
V-302 30 MHz Dual Trace
*Probes included.
... $695*
... $945*
HITACHI
Hitachi Denshi America.Ltd.
175 Crossways Park West
Woodbury, NY 11797
(516) 921-7200
CIRCLE 15 ON FREE INFORMATION CARD
CB, AMATEUR or
COMMERCIAL
COMMUNICATIONS
STEREO PRODUCTS
continued frone page 75
tem is air-cooled via a 2 -speed built-in fan.
Front -panel controls include LED output -level
indicators to display signal levels and output signal distortion, such as clipping, high -frequency
overload, etc.; an amber standby light, an on/off
switch, and a level control. Three rear -panel
Hustler has
the antenna you're
looking for!
Mobile or base station.
Whatever your needs, Hustler
has the quality for exceptional
mechanical and electrical
performance. The result of
unique engineering expertise
and innovation, respected
throughout the industry.
CIRCLE 133 ON FREE INFORMATION CARD
For outstanding antenna
into 4 ohms, 20 Hz -20 kHz with no more than
0.25% maximum (0.12% typical) THD. Other amplifiers are also available: the model 40(20 watts per -channel minimum RMS) and the model 120
(60 watts -per -channel minimum RMS). Suggested retail prices: model 60A, $129.95; model
40A, $81.95; model 40, $79.95; model 120,
$199.95.-Shmegg Electronics, Inc., 8115 Berg
St., Roseville, CA 95678.
quality, look to Hustler!
See your dealer or write:
ICI
kee*
CIRCLE 134 ON FREE INFORMATION CARD
switches handle turn -on delay defeat and stereo to -mono conversion. The rear panel also contains
a chassis -to -circuit ground strap to eliminate
ground loops. The unit weighs 57 lbs. and has
optional front -panel handles. Suggested retail
price: $1595.-Crown International, Inc., 1718
W. Mishawaka Rd., Elkhart, IN 46514.
INC
3275 North B. Ave.
Kissimmee. Florida 32741
Clearly the choice of those
who know quality.
CIRCLE 66 ON FREE INFORMATION CARD
POWER AMPLIFIER, model SA2, is rated to
deliver 220 watts -per -channel minimum RMS into
8 ohms (350 watts -per -channel into 4 ohms) 20
Hz -20 kHz, at less than 0.05% THD. Other specifications include a slew rate of +30 volts per es;
damping factor, +700 DC to 400 Hz into 8 ohms;
and a hum and noise factor of 115 dB below rated
output, "A" -weighted. The two channels are separate with separate power supplies, and the sys-
TV SOUND SYSTEM, model TE-500/Simulcaster, is designed to plug directly into an amplifier.
There is no direct connection to the TV set. A
CIRCLE 135 ON FREE INFORMATION CARD
pickup is placed in close proximity to the TV set.
The unit features a built-in hi-fi IF amplifier detec-
onComputing
GUIDE TO PERSONAL
TM
COMPUTING
A new quarterly from the editors of BYTE.
Become an onComputing reader. You will
fmd how to get started, what you will need,
where to buy a computer and how to use it.
onComputing readers learn about the capabilities of microcomputers in non -technical
language. They fmd out how a computer can be
EVERY THREE MONTHS
onComputing will bring
1
1
1
1
1
use, applications, books, 1
selection- all in an
1
easy-to -read style.
1
1
the latest developments in the field of
personal computing:
J onComputing,
Inc. 1980
a useful and creative tool for business, education, laboratory work, home entertainment and
other applications.
onComputing is on sale at computer stores
or available through subscription.
onComputing Subscription Department, P.O. Box 307, Martinsville, NJ 08836
REGULAR subscription rate.
U.S. 1 yr. (4 issues) @ $8.50
Canada & Mexico 1 yr. (4 issues) g $10.00
FOREIGN (to expedite service, please remit in U.S. funds drawn on a U.S. bank.)
-
Europe (and all other countries, except above) 1 yr. g $12.00 surface delivery
Bill VISA
Bill Master Charge
Bill me (North America only)
Card Number
1 Street/Apartment Number
1 City
1
InO M BO M M IM MIll om m al m
1
1
1
1
1
Expiration
Signature
Name (Please print)
State/Province/County
al
Imm
CIRCLE 68 ON FREE INFORMATION CARD
oul
m
i
1
1
1
1
1
1
1
Postal Code
7830
m um m zu m mo m m ow
1
tor and audio preamp. It provides a frequency
response of 30 Hz -15 kHz, with an adjustable
output level of from 0 to 3 volts, and operates
from a 120 -volt, 60 -Hz power supply. The model
TE-500 measures 21/4 H X 9 W X6 inches D, and
weighs 5 lbs. Suggested retail price: $129.95.Rhoades National Corp., 126 Volunteer Dr., Hendersonville, TN 37075.
BE SWITCHED
EXCLUSIVE SHELDAHL
ENCSWITCH® KIT
SPEAKER SYSTEM, the Ohm I, is a five -speaker,
four-way system housed in a tapered floor enclosure. The system uses a phase -consistent crossover network with three separate level controls.
Yours for only $10.00
Put your imagination and a scissors to
work to make the switch you want.
Modify the .030 thick, non -tactile panel
into a water/dust resistant switching
module. Kit includes design guidelines,
instructions, membrane switching
panel, flexcircuit connector, press -on
nomenclature and RFQ checklist.
r
© 1980 Sheldahf,
Inc.
See your local distributor, or order by mail.
short to ground
16 key kit(s)
Please send me
short to ground
9 key kit(s)
I
crosspoint
crosspoint
enclose $10 in check or money order for each kit order.
NAME
ADDRESS
CIRCLE 136 ON FREE INFORMATION CARD
ZIP
STATE
CITY
Mail to:
Frequency response is from 32 Hz to 21 kHz,
±3.5 dB. The Ohm /features a 12 -inch subwoofer with 8 -layer voice coil and separate input jack,
an 8 -inch woofer for the 100 Hz-2kHz range; a
1'/ -inch tweeter with 6 -lb. magnet; and two 1 inch supertweeters. The speaker enclosure is of
natural walnut veneer with a removable grille. The
unit weighs 99 lbs., and has a suggested retail
price of $600 each.-Ohm Acoustics Corp., 241
Taaffe Place, Brooklyn, NY 11205.
L.
Sheldahl Inc.
Electrical Products Division
{r Sheldahl
P.O. Box 170
Northfield. MN 55057
They look expensive.
They sound expensive.
But they're not because you
build them yourself.
CASSETTE DECKS model SC -3300 and model
SC -3330 are designed for use with metal tapes.
They feature Direct -O -Ma tic front -loading and
have full logic control for their two motors-an
FG DC servo motor for the capstan and a DC
motor for the reels. The record/playback head
uses a special alloy designed to prevent the magnetic saturation that may occur using metal
tapes. The ferrite erase head has a double gap
CIRCLE 137 ON FREE INFORMATION CARD
and an erasure factor of 70 db. 16 -segment LED
peak -level displays create bar-graph arrays for
both channels, and a tension holdback device
keeps FM modulation and wow -and -flutter to a
minimum. Other features are memory rewind,
auto play, and auto repeat.
The decks have a three -position bias and EQ
selector switches for metal, chromium, and normal tapes. Frequency response is 20 to 17,000 Hz
for metal tape and 20 to 16,000 Hz for chromium
dioxide. Dolby noise reduction gives a signal-tonoise ratio of 69 dB. The SC3330 (shown) is finished in matte black with detachable handles
suitable for rack mounting, while the SC -3300 is
finished in brushed aluminum in a simulated walnut case. Suggested retail price for both models
is $420.-Sansui Electronics Corp., 1250 Valley
R -E
Brook Ave., Lyndhurst, NJ 07071.
Organs.
The Magnificent Schober Electronic
great organs. And for up to
I
I
Imagine the pride and joy of owning one of the world's
50% less than an instrument of comparable sound and quality. Schober organ
kits come in 5 different styles and sizes to fit your musical taste and budget.
Mail this coupon today for free information.
The Schober Organ Corp.' Dept. RE -90
ork NY 10023
West 61st Street, New York,
Send me free catalog.
,
I
Name
Address
State
Lity
CIRCLE 48 ON FREE INFORMATION CARD
www.americanradiohistory.com
Zip
77
Kleps 40
-
Kleps 10
books
20
Kleps 30
AM INTRODUCTION TO PERSONAL AND BUSINESS COMPUTING,
by
Rodnay Zaks. Sybex, Inc., 2020 Milvia St., Berkeley, CA 94704. 245 pp. 5'/2
X 6'/, in. Softcover $6.95.
This practical introduction to microcomputer technology does not require
a technical or electronic background. It provides a detailed introduction
to
the concepts, peripherals and techniques of microcomputers. The first three
chapters deal with system basics, how to use them, and how they work;
Chapter 7 examines business computing; Chapter 9 deals with peripheral
devices. Among the other topics covered are system costs, different types of
units, plus problems occurring in business computer usage. Several
appendixes and an index are included in the back of the book.
Clever Kleps
Test probes designed by your needs-Push to seize, push
to release (all Kleps spring loaded).
Kleps 10. Boathook clamp sgrips wires, lugs, terminals.
Accepts banana plug or bare wire lead. 43/4" long.
Kleps 20. Same, but 7" long.
Kleps 30. Completely flexible. Forked -tongue gripper. Accepts banana plug or bare lead. 6" long.
Kleps 40. Completely flexible. 3-segment automatic collet
firmly grips wire ends, PC -board terminals, connector pins.
Accepts banana plug or plain wire. 61/4" long.
Kleps 1. Economy Kleps for light line work (not lab quality).
Meshing claws. 41/2" long.
Pruf 10. Versatile test prod. Solder connection. Molded
phenolic. Doubles as scribing tool. "Bunch" pin fits banana
jack. Phone tip. 51/2" long.
Kleps
110 IC TIMER PROJECTS, by Jules H. Gilder. Hayden
Book Co., Inc.,
Rochelle Park, NJ 07662. 115 pp. 5'/. X 9 in. Softcover. $5.25.
This sourcebook provides an in-depth look at applications for
the 555
timer IC. Design ideas for interesting and useful circuits are included that
can be applied to real life. Among the eight chapters are included
descriptions of the basic modes and operations of the IC timer and its applications
as a monostable multivibrator and in astable circuits, its use in logic
devices,
in automotive applications, plus many more. Schematic diagrams
accompaly the text.
/
Write for complete catalog of - test probes, plugs, sockets,
connecto s, earphones, headsets, miniature components.
Available through your local
distributor, or write to:
Prat 10
Pruf:
1i0
,
.
INDUSTRIES INC.
11,101-0B
129 Spencer Place, Mamaroneck, N.Y. 10543
In Canada: Rye Industries (Canada) Ltd.
CIRCLE 40 ON FREE INFORMATION CARD
COLOR TELEVISION: THEORY AND TROUBLESHOOTING, by Stan Prentiss. Prentice -Hall, Inc., Englewood Cliffs, NJ 07632. 370pp. 7 X 9'/, in.
Hardcover. $16.95.
The reader is presented with a solid foundation in color TV, both the
theory and detailed troubleshooting techniques which will make it possible
for him or her to handle problems relating to a wide range of TV models,
from the very earliest designs to the newest ones on the market.
Antenna installation and replacement is covered, as well as transmission
PRO -1 DIGITAL LOGIC PROBE
,
Compatible with DTL, TTL, CMOS.
MOS and Microprocessors using a 4
to 15V power supply.. Thresholds au-
tomatically programmed. Automatic
resetting memory. No adjustment required Visual indication of logic levels, using LED's to show high, low,
bad level or open circuit logic and
pulses. Highly sophisticated, shirt
pocket portable (protective tip,'cao
and removable. Coil cdrd).
DC to > 50 MHZ
10 Nsec. pulse response
120 K 2 impedance
Automatic pulse stretching to 50 Msec.
Automatic resetting memory
Open circuit detection
Automatic threshold resetting
Compatible with all logic
families 4-15 VDC
Range extended to 15-25 VDC
with optional PA -1 adapter
Supply O.V.P. to + 70 VDC
No
*
ADD $2.00 FOR SHIPPING
(N, Y. CITY AND STATE RESIDENTS ADD TAX)
switches/no calibration
OK MACHINE & TOOL CORPORATION
Bronx, N.Y 10475 (212) 994-6600 / Telex 125091
3455 Conner St
CIRCLE 12 ON FREE, INFORMATION CARD
Kleps
1
lines, with careful notes as to what they will and won't do for reception.
Specific information on remote -control -device circuitry, and the most common malfunctions relating to it, is given. The author gives detailed information on major manufacturers' designs.
Special attention is given to power supplies, as well as a discussion of
Kleps 10
- 20
power transformers. After the final chapter, dealing with microprocessors
and their probable future as well as present role, there are 25 pages of
questions and answers, relating to each chapter.
MOST OFTEN ASKED QUESTIONS AND ANSWERS ABOUT AMATEUR
RADIO, by Leo G. Sands and Joseph L. Lynch. Hayden Book Company,
Inc., 50 Essex St., Rochelle Park, NJ. 07662. 111pp. 5'/. X 81/4 in. Softcover;
$5.95.
This book has 10 sections, and is directed toward the person who would
like to become an amateur radio operator. Each of those sections covers the
most -needed information for the beginner in its subject area. The sections
are as follows:
1: Amateur Licenses; 2: Communications Operations; 3: Frequency
Bands; 4: The Build -or-Buy Decisions; 5: Diagrams; 6: Transmitters; 7:
Receivers; 8: Antenna Systems and Propagation; 9: Microphones, and 10:
Projects for Experimenters. There are also four appendices: A: Glossary; B:
International 0 -Signals; C: Study Guide for Element 2 Examinations for
Novice Class Amateur Radio Operator License, and D: Location of Federal
Communications Commission Field Installations.
The text Is presented in the form of clear, brief questions and concise
replies. There are many diagrams and some photos in addition to the special
section explaining how to read various kinds of diagrams-block, schematic, and pictorial.
PHASELOCK TECHNIQUES (2nd Edition), by Floyd M. Gardner. WileyInterscience, a division of John Wiley & Sons, 605 Third Avenue, New
York, NY 10016. 285 pp. 6'/. X 9'/. in. Hardcover. $18.50.
Rewritten and updated, the first portion of this second edition reviews the
fundamentals of phase-locked -loops and discusses the basic problems confronting designers. That is followed by a discussion of the practical aspects
of circuits and an outline of procedures for determining phase -locked -loop
parameters.
The balance of the book deals with engineering descriptions and analyses
of phase -locked -loop applications. Subjects covered include phase-locked
modulators and demodulators, synthesizers, receivers, transponders, oscillator stabilizers, and data synchronizers. For practicing engineers, system
engineers, design engineers, and equipment users who need to understand
R -E
the operation of their equipment.
Kleps 20
Clever Kleps
-
Push to seize, push
Test probes designed by your needs
to release (all Kleps spring loaded).
Kleps 10. Boathook clamp 'grips wires, lugs, terminals.
Accepts banana plug or bare wire lead. 43/4" long.
Kleps 20. Same, but 7" long.
Kleps 30. Completely flexible. Forked -tongue gripper. Accepts banana plug or bare lead. 6" long.
Kleps 40. Completely flexible. 3-segment automatic collet
firmly grips wire ends, PC-board terminals, connector pins.
Accepts banana plug or plain wire. 61/4" long.
Kleps 1. Economy Kleps for light line work (not lab quality).
Meshing claws. 41/2" long.
Pruf 10. Versatile test prod. Solder connection. Molded
phenolic. Doubles as scribing tool. "Bunch" pin fits banana
jack. Phone tip. 51/2" long.
Write for complete catalog of - test probes, plugs, sockets,
connectors, earphones, headsets, miniature components.
Available through your local
distributor, or write to:
o
e RYE INDUSTRIES
egi
f
In Canada: Rye Industries (Canada) Ltd.
CIRCLE 40 ON FREE INFORMATION CARD
LCW8161 Basic Electricity and DC Circuits
1026 pages. Building blocks for a
thorough working knowledge of
$19.95
DC circuits.
This book
tells you
how.
And why.
Understanding Microprocessors.
From the Texas Instruments
Learning Center. 288 pages. $4.95.
Learn quickly and easily about the explosive impact microprocessors have
had on electronics technology.
How the "miracle chip" works to make those things you use everyday
calculators, appliances, microwave ovens, stereos, tv, automobiles-even
toys and games-do the remarkable things they do.
Understanding Microprocessors is the latest addition to the Texas Instruments Understanding Series:" All TI Understanding Series books are
ideal for those who want to learn about today's technology-without
having to devote years to the study.
Written in bright, clear, down-to-earth language, and fully illustrated,
you'll find these books to be invaluable tools for your personal entry into the
microelectronics revolution. See coupon for all details.
-
©1980
INC.
129 Spencer Place, Mamaroneck, N.Y. 10543
This chip
changed
your
life.
Pruf 10
D
LCB3361
Understanding Solid -State Electronics
270 pages-New 3rd edition.
Individualized approach for learning
microelectronic basics.
$3.95
LCB3311
Understanding Digital Electronics
265 pages. The springboard for a look
into the fascinating world of today's
electronic logic devices, circuits and
systems.
$3.95
LCB4023 Understanding Microprocessors
288 pages. For the newcomer to
microprocessors. What they are, what
they do and how they work.
$4.95
LCB3321 Understanding Calculator Math
224 pages. Unlocks the real power of
$3 95
your handheld calculator-loaded with
practical applications.
Add sales tax, except AK, DE, MT, NH, OR.
Mail check or money order to Texas Instruments, P.O. Box 3640, M/S 84, Dallas,
Texas 75285.
Orders in Continental U.S. shipped prepaid.
Foreign orders: Prepaid in U.S. dollars only.
Include shipping costs.
Prices subject to change without notice.
Name
Address
City
_
State
Zip
RE -380
TEXAS INSTRUMENTS
INCORPORATED
80109A
Texas Instruments Incorporated
79
xec>e
Q,s\x.'.,;6°s FROM RCM
PR®TEUS
PROGRAMMABLE
TM.
PRESET LEAD SYNTHESIZER
2
exponential VCO's with Sync.
Noise source
24 dB/octave tow pass VCF
Wide range LFO
Wide range ADSR envelope generator
3 octave digital keyboard
16 programmable presets with ni -cad battery
backup
Preset data and address port provided.
Liberal patch over hardwire points
QUESTIONS? How easy is it to assemble?
How powerful and versatile? What are the interfacing details? The PROTEUS USING/
HIGH STABILITY
CRYSTALS FOR
FREQUENCY rTh,
OR TIME
USE THE BEST
BUY
JAN CRYSTALS
CB
CB
ASSEMBLY MANUAL set answers these.:
questions and many more.
Príoe-$16 00 refundable with purchase.
2
standard
meter
Scanners
Amateur Bands
General
Communication
Industry
easy
to
charge
Marine VHF
Micro processor crystals
No. 9750 PROTEUS KIT
$399.00,
$499.00
Asssmbtad
(shipped freight collect)
(
)
(
)
()
()
Send the 8750 kit, $399.00 enclosed.
Send the 8750 assembled, $499 enclosed.
TELL ME MORE, send the 8750 Assembly &
Using manual, $10 enclosed.
Send FREE Catalog.
Send for for our latest catalog.
Write or phone for more details.
Jan Crystals
JAN
CRVSTRLS
2400 Crystal Drive
Ft. Myers, Florida 33907
all phones (813) 936-2397
Name
Address
City:
`Electronics
State:_ Zio
Dept. 3-R, 1020 W. Wilshire
Okla.'City, OK 73116
CIRCLE 46 ON FREE INFORMATION CARD
I
I
CIRCLE 21 ON FREE INFORMATION CARD
Put Professional Knowledge and a
COLLEGE DEGREE
in your Electronics Career through
8 Instruments in1
Out -of -Circuit Transistor
Analyzer
Dynamic In -Cir-
cuit Transistor
r
Earn Your
DEGREE
Signal Generator
Signal Tracer
Voltmeter
Milliammeter
Battery Tester
Diode Checker
by correspondence, while continuing your
present job. No commuting to class. Study
at your own pace. Learn from complete and
explicit lesson materials, with additional
assistance from our home -study instructors.
Advance as fast as you wish, but take all
the time you need to master each topic.
The Grantham electronics degree program begins with basics, leads first to the
A.S.E.T. degree, and then to the B.S.E.T.
degree. Our free bulletin gives complete
details of the program itself, the degrees
awarded, the requirements for each degree,
and how to enroll. (We are located at 2500
S. LaCienega Bl., Los Angeles, Calif.) Write
to our mailing address shown below for
Bulletin R-80
Grantham College of Engineering
P. O. Box 35499
Los Angeles, California 90035
Worldwide Career Training thru Home Study
&
Radio Tester
Model
Transistor Analyzer 212
Factory Wired & Tested
$35.98
Easy -to -Assemble Kit
$23.97
--
Now you can pinpoint defective transistors and their
circuit troubles speedily with a single, feature -packed instrument instead of a costly elaborate set-up. Performance-proven by thousands! Checks all transistor types, hi
or low power, for DC current gain (beta) to 200 in
3 ranges, and leakage.
Universal test socket accepts all base configurations.
Identifies NPN or PNP transistors. Dynamically tests all
transistors (oscillator check) and AF, IF, RF circuits.
No external power needed. Measures DC currents to
80 ma. Complete with test leads, instruction manual and
transistor listing.
Write for FREE catalog of the world-famous
EMC line of test instruments.
M
ELECTRONIC
MEASUREMENTS CORP.
625 Broadway, New York, NY 10012
80
www.americanradiohistory.com
EQUIPMENT REPORTS
continued from page 32
centered on a printed -circuit board mounted to
the temperature -controlling potentiometer.
The entire circuit is fused, with the fuse cartridge readily accessible from the back panel of
the console.
The console is both handsome and rugged. A
wrap -around black wrinkle cabinet is accented
by a white panel with a baked -enamel finish.
Four rubber feet under the control console
provides no -slip mounting as well as scratch
and mar prevention. The console is heavy
enough (approximately two pounds) to provide
a reliable anchor for the soldering iron.
An assortment of tip styles is available,
depending upon the application of the iron. All
tips are made from pure iron and are pre tinned. The heating ellement is at zero potential
to avoid any possibility of current loops
between the iron and control console (or circuitry, assuming proper grounding precautions
have been taken).
The pure iron tip wets easily with solder,
and can tolerate a wide variety of fluxes.
Excessively high temperature and extremely
caustic fluxes are not recommended, however.
This combination will inevitably take its toll in
soldering tips!
For those of us who have taken for granted
that a soldering iron must be clumsy, requires
a long time to heat up, and must be set down
on an improvised holder, the T-7 offers a
refreshing surprise. The T-7 is designed to be
held like a pencil and fits snugly and comfortably. Because of the low mass of the element
and tip (less than one ounce!), the balance is
not tiring. The power cord to the iron is extra
flexible, lightweight, and thin. It is hardly
noticeable while maneuvering the soldering
iron. The handle of the T-7 iron is made of
nylon, and seems impervious to the heat from
the tip. Much of this cool comfort is afforded
by the heat -sink baffle mounted just between
the fingertips and the soldering iron tip. A
side -mounted cradle securely anchors the soldering iron between soldering applications. A
removable tip -cleaner houses a replaceable
sponge to wipe the soldering tip when necessary. The cradle is well ventilated, accounting
for the cool operation of the control console.
We found the T-7 to offer advantages of
both battery -operated lightweights and cord powered heavyweights. Like the battery -powered irons, the T-7 is extremely maneuverable
even though it has an attached cord. Like the
cord -operated units, it doesn't have a limited
operational life before recharge is necessary.
Thus, the T-7 is capable of long-term, tireless
operation at optimum performance.
Heat -up time is about one minute. In our
turn -on test, we switched the control console
on, advancing the temperature control to about
midrange. Within one minute the tip easily
melted thin-gauge rosin-core solder. Advancing the temperature control, we found the temperature to respond almost immediately.
The Micro -Soldering Station cools down
quickly. It packs away very compactly, and the
high -quality power cords should endure considerable folding.
The T-7 Micro -Soldering Station from
American Beauty reflects the professionalism
of thoughtful design. We liked the unit, and
would recommend it for continuous production-line applications as well as serious bench
applications. The model T-7 Micro-Soldering
station lists for $86.
R -E
ti.r-J
SATELLITE TV
products or serCLASSIFIED COMMERCIAL RATE (for firms or individuals offering commercial
minimum 15 words.
vices). $1.50 per word (no charge for zip code)
851E per word .. .
NONCOMMERCIAL RATE (for individuals who want to buy or sell personal items)
no minimum.
available as all caps) at
ONLY FIRST WORD AND NAME set in bold caps. Additional bold face (not
by accredited advertising
105 per word. Payment must accompany all ads except those placed
advance. All copy
agencies. 5% discount for 6 issues, 10% for 12 issues within one year, if paid in
not be accepted until
subject to publisher's approval. Advertisements using P.O. Box address will
be in our hands on
Copy
to
number.
advertiser supplies publisher with permanent address and phone
May 26). When
the 26th of the third month preceding the date of the issue (i.e., August issue closes
working
normal closing date falls on Saturday, Sunday, or a holiday, issue closes on preceding
...
FOR THE HOME
Our receiver lets you get
over 75 channels of television directly from earthorbiting cable TV satellites!:
HBO, Snowtime, super stations, sports and movies
from around the world.
day.
Sick of Network TV?
Burglar -Fire Protection
f
FREE
CATALOG
Burdex Security Co.
lowm,hiu,an R.hba,asMawio,
Alar,n SY°can° end Device°
Box 82802 -RE
n,,..... Build our kit
TELEPHONE bugged? Don't be Watergated!
Countermeasures brochure $1.00. NEGEYE LABORATORIES, Box 547-RE,-Pennsboro, WV
26415
UNIVERSITY degrees by mail! Bachelors, MasFree revealing details. COUNters, Ph'D's
SELING, Box 317-RE3, Tustin, CA 92680
Our catalog shows how. Instoll your own
alarm systems and devices and save SSSS. We
offer FREE write-in engineering service.
IAÚAM7
Buy Complete or
and save!
EDUCATION & INSTRUCTION
Protect Your Life, Home, Business, Auto, etc.
leo
.
Lincoln, Ne. 68501
.
Our 24 -channel receiver provides "studio quality"
install! Ultra low power consumption! Brilliant color! Works anywhere! FCC
licensing no longer required. Order today!
Complete details covered In our Home Earth Station manual. Send $7.95 today (refundable against any
purchase), or cat:
TV reception. Easy to
.
24-hour C.O.D. Hotline
(305) 869-4283
BROADCASTING! Start your own radio station at
home, school, church! Become a DJ! Free information. "BROADCASTING", Box 130-F3, Paradise, CA 95969
GRAPHIC EQUALIZER
TWELVE bands/channel $100 kit. still available;
see May 1978 R/E cover story or write: SYMMETRIC SOUND SYSTEMS, 912 Knobcone Place,
Dept. R, Loveland, CO 80537
SPACECOAST RESEARCH
Dept. T, P.O. Boo 442, Altamonte Springs, FL 32701
SATELLITE TELEVISION
BUSINESS OPPORTUNITIES
RECEIVE secret satellite television. Complete
plans $25.00, information $4.40. TELE -TEC, 8688
Royal Drive, Noblesville, IN 46060
LNA PCB 2 -stage Birkill design as in July "79"
CATJ, Cooper manual $15.00. NORMAN GILLASPIE, 2225 Sharon Road, #224-1. Menlo
Park, CA 94025
TRS-80
REAL time clock for Level includes software on
cassette with documentation $25. Inter-connectng cable $12. DANCE, 27 Nectar Lane, Levit own, PA 19054
I
MECHANICALLY inclined individuals desiring
ownership of Small Electronics Manufacturing
Business-without investment. Write: BUSINESSES, 92-R, Brighton 11th, Brooklyn, NY 11235
BECOME a semiconductor distributor full or part
time. Here is a rare opportunity to engage yourself
with one of America's leading suppliers of original
Japanese semiconductors and exact replacement parts. Sell directly to retail outlets, repair
shops, service technicians and manufacturers.
Complete product line, backed up by a 40 million
dollar inventory, priced to sell up to 50% lower
than the leading replacement line. All products
guaranteed. No investment required. Live wires
only. Write to: NEW -TONE ELECTRONICS INTERNATIONAL, P.O. Box 1739, Bloomfield, NJ
send this form along with your check
To run your own classified ad, put one word on each of the lines below and
for $1.50 per word (minimum 15 words) to:
Radio -Electronics, 200 Park Avenue South, N.Y.,
IN.Y. 10003
ORDER FORM
ad to
PLEASE INDICATE in which category of classified advertising you wish your
appear. For special headings, there is a surcharge of $10.
(
) For Sale
) Business Opportunities
(
(
) Plans/Kits
(
)
(
) Wanted
(
) Education/Instruction
07003
NEW tax loopholes discovered. Everyone eligible.
Unique ideas. Free facts. ULC, Box 359 BC,
Clarkston, GA 30021
WHOLESALE, bearcat scanners, C.B.s, stereos,
speakers, top brands Fuzzbuster, Cobra President, Pioneer, Jenseen, Regencey. $3.00 brings
catalog price list to: T & D Associates, North Side
Square, Paris, IL 61944
Special Category: $10
(PLEASE PRINT EACH WORD SEPARATELY, IN BLOCK LETTERS.)
5
2
3
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
1
1
Be an ELECTRONICS
SPECIALIST
spare
Train at home In
time No previous
experience needed
Manufacturing, aviation, computer technology. communications, TV and radio
broadcasting._even sales and marketing
...all depend on electronics specialists for
many of their basic requirements. And
now you can get the same home -study
training system used by some of the
country's biggest corporations for their
own employees. Everything explained in
easy -to -understand lessons with plenty of
pictures and drawings. Get free facts
without obligation. No salesman will call.
Send for FREE Information!
ICS Electronics School, Dept. PI010
26
27
28
29
30
ICS Center, Scranton, PA 18515
I MAIL THIS COUPON FOR FREE FACTS how l can :earn electronics
at home in my spare
..,._
INAME
31
32
33
34
35
I
..
ADDRESS
`ITY
STATE
ZIP
,
81
www.americanradiohistory.com
ATV
Y
Video monit
kits,
-
FOR SALE
in CCTV
h ...specialists
and computer monitors!
cola &
B/W * TV Cameras,
Video-to-RF
981-3771
ggors
eacatalog. PhoneVa
13 -RE
Broadway
rebuilding machinery. COMPLETE
TRAINING. Buy with CONFIDENCE from
the ORIGINAL MFGR.
For complete details send name. address.
zip to
LAKESIDE INDUSTRIES
4071 N. Elston Avenue
Chicago, III. 60618
Phone: 312-583-6565
SCANNER/monitor accessories-kits and facto-
Dakota City, NE. 68131
ry assembled. Free catalog. CAPRI ELECTRONICS, Route 1R, Canon, GA 30520
FREE catalog, IC's, LED's, semi's, parts. CORONET ELECTRONICS, 649A Notre Dame W., Montreal, Que., Canada H3C 1H8. U.S. inquiries.
WANTED
MARCHANT mechanical calculator Model 10MR,
$100.00. LEONARD WOODALL, 3811 Dempster,
Dallas, TX 75211
OSI challenger 1P-Superboard II 90-pagestep-bystep programming manual, $5.95 +$1.00 P&H,
TIS, Box 921RE, Los Alamos, NM 87544
RECONDITIONED test equipment. $1.00 for catalog. JAMES WALTER TEST EQUIPMENT, 2697
Nickel, San Pablo, CA 94806
INVENTIONS
SATELLITE Television -movies, sports, etc. Build
or buy your own Earth Station. Send $3.00 for
information. SATELLITE TELEVISION, Box 140,
Oxford, NY 13830
HAMS, CBers, SWLs-eight character morse -Aword morse code reader; RTTY reader. Decodes
signals off the air. Send for details. MICROCRAFT
CORPORATION, Box 513R, Thiensville, WI 53092
1-414-241-8144.
FREE information on offering your invention for
sale. KESSLER SALES CORPORATION, C-313,
Fremont. OH 43420
TEST equipment, new and used. Catalog $1.00.
PTI, Box 8756, White Bear Lake, MN 55110
CARBIDE drills -Numbers 68 (.031"), 65 (.035")
62 (.038"), 60 (.040"), and 58 (.042"). All 1/8 -inch
shank. New. Two for $7.95. Each additional
drill -$3.70. Postpaid. CM CIRCUITS, 22 Maple
Avenue, Lackawanna, NY 14218
39" OVERALL
Ile
ALOUTHEOKINGNTICEIectronic
95
"SECRET Registry of U.S. Government Radio
Frequencies (25 to 470 MHz)." Book shows
3,800+ frequencies: FBI, FCC, Treasury, Border,
Immigration, Secret Service, Customs, NASA,
military, more. $4.95 ppd., CRB RESEARCH, Box
56-RE, Commack, NY 11725
NEGATIVE ion generators and accessories (assembled/kits). Details -$1.00. GOLDEN ENTERPRISES, Box 1282, Glendale, AZ 85311
"THE Intelligence Library" Technical secrets.
Books on Electronic Surveillance, Lock -Picking, Demolitions, Covert Sciences, etc. One dollar, (refundable): MENTOR PUBLICATIONS,
Dept. Z, 135-53 Northern Blvd., Flushing, NY
Pump to cock! Pulling trigger fires -giving an audible sound
and making contact thru the 2 -wireitcable.
Has compartment
made
to hold 9V battery & a couple caps that charge up &
Wild West
EACH then discharge thru the leads....lens inofmuzzle.
We do not have
Goes
info....but it's a terrific start for creating
games; can
"Electronic" No. 601 04R specific
be used by the kids....it's harmless. Limited
Quantity!PLASTIC
High Power TRANSFORMER
This transformer is one of the most versatile high
transformers we have ever sold. It has 6 heavy power
windand a dual tapped primary. It has isolationduty
RARE ings,
winding
FIND! rated at over 630 VA, plus 5 other windings. Proper selec-
95
-
1
2
-
Secondary
115V @ 5.5 Amps
32V @ 1.4 Amps
tion of the primary taps will allow the various secondary
to be varied by 2 15%.
The transformer may
Delta No. 6996R voltages
be used on 115 or
volts, by putting the primaries in
series or parallel. All output voltages may 230
be reduced half if the primary windings
are placed in series and operated on 115 volts.
We
provide
a
sheet showing
many of the voltage possibilities of this flexible transformer. data
are the rated
voltages. These currents are extremely conservative. We have Listed
as much as
25% more, still keeping with our own ratings. Wt. 39 lbs. 61/2"drawn
x 5'S" x 7yr"
15V @ 4.5 Amps 5
15V @ 5.0 Amps
For computers, high power amps,
11 V @ 1.75 Amps 6 --- 15V @ 5.0 Amps
lab supplies, bench supplies, etc.
4
11354
VIDEO tapes, movies, equipment, lowest prices,
free price list. VTR, Box 234, Herald, CA 95638
HARD to find old radio and T.V. tubes. Large
-
3-
-
r1
PICTURE TUBE MACHINE
We buy and N11 NEW and USED CRT
RADIO & TV tubes 366 each. One year guaranteed. Plus many unusual electronic bargains.
Free catalog. CORNELL, 4217-E University, San
Diego, Calif. 92105
Inventory. MERIT ELECTRONICS, Second
Convert Your Car Into A Concert Hall!
t 1,
S
r1:10. U
Street, Wallkill, NY 12589
RESISTORS '/oW, '/4W, 5% CF .03C each. Any value mix. Send for free information. JR INDUSTRIES, 5834-C Swancreek, Toledo, OH 43614
SAVE up to 50% on name brand test equipment.
Free catalog and price list. SALEN ELECTRONICS, Box 82-M, Skokie, IL 60077
AMd:A6
MONO
1eAUTOMATIC RADIO
MADE BY THE
Ì
AUTO RADIO
c
SPECIALISTS!!
-/,r..e...,,
.
Models
,.
- One of America's
largest
independent manufacturers of automobile radios
has
Even up which we announced in Nov. 1979 Radio
lectronics &Popular Electronics magazines). We've
been fortunate in acquiring more of the last auto radios in production. These are AM-FM-MPX-Stereo
sets....designed for new cars. All are tested 100%
operational and come with knobs & 5 push buttons.
Ideal for installing in your auto, van, camper, boat
or any other place 12 VDC is available.
Quality Speakers
For Above Radios -Surplus
o,óR
573oR
Prices 6001 3R
60014R
060011 R
60026R
s
5730
95
60013
60011
Size
Type
9x6
Oval
5
Ohms Watts Magnet
8
10 2-3/4" Rd.
8
3
2.3/8 "
& 8
12 3" Rd.
& 8
12 3.45" Rd,
8
10 2-5/8"Sq.
Round
Round 4
Round 4
6
5 ea
ea
4x6
4x6
Mass.
Mtg. Ctrs.
Each
6V, x 434"
$7.95
5.95
7.95
9.95
5.95
5.95
5-5/8
3-7/8
3-7/8
Oval
514 x 3"
Oval
8
10 2-3/8"Rd 514 x 3"
High compliance stereo speakers
ELECTRONIC MUSIC
ELECTRONIC music and home recording in
Polyphony magazine. Advanced applications, interviews, projects, computer music. Sample,
$1.50. Subscription (6 issues), $8 US/$10 foreign.
POLYPHONY, Box R20305, Okla. City, OK
73156.
e
FREE
LCATALOG
176 SECOND AVE.
WALTHAM, MASS.
1eweee.
02154
SANNAMERICARO
or southern N.H. visit our retail at
ELECTRONICS
Minimum Order $8.00
TEL. (617) 388-4705
7
Oakland St., Amesbury, Blass.
CIRCLE 28 ON FREE INFORMATION CARD
.
*.
. ....,
Wireless Mic
size Ice
Each
$18.95
04
Super Powerful
ii:
_-,
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.
Records both sides of phone conversation
stops recorder when phone is hung up
This device is not an answering service.
Order Address
1.20-PG.IN
AM -FM
our area, northeastern
-All
718 Amherst, N.H. 03031.
-
sure to
include
postage
$2 Shpg.
BUY OE A LIFETIME
RADIO as above except it is
AUTOMATIC SAME
not stereo! Excellent FM reception;
RADIO -FM picks up stations with weak signals!
Complete with metal top plate, push
No. 5745R buttons and front bezels.
When in
Unscramblers-Giant Tesla-Stunwand-TV Disrupt-
er -Energy Producing, Surveillance, Detection, Electrifying, Ultrasonic, CB, Auto and Mech. Devices, Hundreds More
New Plus INFO UNLTD PARTS SERVICE. Catalog $1. Information Unlimited, Dept. R8 Box
NEWS ITEM! -- Auto stereo has become as sophisticated as home hi-fi
and nearly as expensive. You
can spend $300 for simple components
--which means
stereo can be out of reach for many folks and 2nd
cars. If you want a stereo sound system you can
start with the purchase of a $100 radio for only a
mere $19.95 at Delta. The radios
designed for
small interior of your car that has are
the combination
of the hard plastic and soft upholstered surfaces. It
is the perfect radio for a top -sounding stereo system.
Lie
60010
AMAZING ELECTRONIC PROJECTS and PRODUCTS:
Lasers Super Powered, Burning. Cutting, Rifle, Pistol.
Pocket. See in Dark -Shotgun Directional Mike-
É
loo STEREOUTO
RADI
AM FM MULTIPLEX
$2 for
Shpg.
No. 5744R
FACTORY CLOSEOUT!
e
,bo.p,
May
Vary
PUSH BUTTONS
Disc Aval
.
limes more powerful than other mics.
Transmits up to '/a mile to any FM radio
10
Easy to assemble kit. 15V battery (not incl.)
sita
Call (305) 725.1000 or send $16.95 $1.00 shipping par Item
to USI Corp., P.O. Box RE -2052, Melbourne, FL 32901.
COD', accept For catalog of transmitters, voice scramblers
ui and other specialty items, enclose $2.00 to USI Corp.
-41-.-------
--
specia
2SC1308K Sanyo
Horizontal Output Transistor
Equivalent to ECG 238
Minimum order of
o
Specifications
Nuumbmber
C1308K
VcBo 1500V
lc 7A.
POSOW
D613
VC Bo
8633
Audio
Technica
Cartridge
100V
AT
Our Number
Number
Price
Horizontal
output
Most horizontal
2.4 5
Highpower
audio
output
TO-220
case.
Replaces most
TO -220 case
High-
Most TO -220
case PNP audio
outputs.
Equiv. to
output transistors
including C1358.
01172, C1172B.
3350 Equiv. to
ECG 238
V PN
.80
audio out -
outs. Equiv. to
ECG 196
power
audio
output
T0-220
.90
ECG 197
Case.
2.45
Most TO-3 NPN
High-
VcBo 180V
le 12A.
Pc 100W
audio outputs.
Including
3-1079, C1080.
0118. 0425.
0426. D371.
power
output
TO-3
Price
Case.
D217. Equiv. to
ECG 280
$6.95
9.90
19.90
24.80
AT1110
AT1111E
AT1112XE
AT1113E
AT10
AT11E
AT12XE
AT13E
VcBo 100V
lc 6A.
Pc 40W
Equiv. to
ECG 197
D733
Replaces
Application
TO-3
Case
lc 6A,
Pc4OW
10.
B697
Most
HighPower
VcBo 180V
le 12A,
Pc 100W
T03,
2.50
PNP
audio outputs.
Equiv. to
output
TO -3
ECG 281
case.
ECG is a registered trademark of the
Also check our ow prices on SHURE cartridges.
Sylvaiia Corporation.
Our huge buy of popular
fuses makes the prices too good for you to PASS UP!
AGC Style Fuses
(10 to 99) 12 each
GMA (F Type) Fuses
(10 to 99) 18 each (100 up) 144 each
(100 up) 84 each
for Audio, TV & C.B.
Original Japanese Semiconductors
listed here. Write for our
We also have hundreds of other semiconductors not
free 20-page ca a og or receive it free with each orde-.
I
Number'
0.9136
Á9203
ÁN206
6N208
AN210
Á9211
AN214
49217
Á9234
Á9236
49239
5N240
30 6 up
220
120
240
4.50
2.00
210
145
100
4.60
490
480
2.40
AN241
Á9245
Á9246
A44247
Á9252
Á9253
AN260
AN264
Á9271
0.5272
0.5274
0.9275
Á5277
Á9208
Á9289
ÁN313
Á5315
4N328
49331
0.9342
Á14343
05360
A14374
414350
AN7145
AN7150
210
4.20
4.40
240
290
2.20
2.10
2.00
280
4.20
1.40
3.80
120
780
5.80
290
1.80
3.20
4.40
3.80
2.80
2.20
280
6.80
420
340
30608
Number
9Á301
BÁ312
120
160
440.1156
6Á318
150
420
175
Number
84313
BÁ301
BAB11A
BÁ521
BA532
CX075
0X096
CX100
CX101G
CX103
CX104A
0X1314
CX133A
CX134A
CX135
CX1380
0*1374
0%138
CX139
0X141
CX145
0X150
0%157
0X158
CX172
09728
0911
DM31
DM31
DM54
DM84
440.1137
F141138
4441149
4441151
1B0
1.90
430
360
5.80
9.00
780
790
UP
Number
150
LÁ3300
113301
LA3350
LA4030P
10.4031p
LA4032P
LA4051P
30 &
230
1461196
14Á1197
1.90
M41199
HA1203
HA1306W
1-10.1308
440.1309
380
180
18D
320
4.20
3.60
3.60
HA1313
H41314
HA1316
HA1318P
240
3.40
14Á1319
290
7.45
HA1322
HA1325
2.30
9.90
9.80
1-1A1338
980
1401339P
11413420.
9.80
140.13394
9.90
144.1366W
990
990
990
990
990'
990
5
B
5.80
1150
10.20
1.00
100
3.80
1.00
690
1.90
1.90
360
125
HA1368W19
4441377
H01389
LA1230
LA1240
LA1353
LA1366N
4,0.1367
LA1369
LA3130
LA3150
LA3155
LA3201
2.30
2.30
49.1366WR
HA1368W
4441406
LA1111
LA1201
220
320
230
-
230
230
390
3.90
4.90
2.40
2.00
90
93
2.10
1.35
250
240
240
290
6u
30
80
80
35
50
60
70
70
35
36
35
164100
LA4101
LA4102
LA4220
LA4400
250
180
210
LA4430
101110
103001
103120
L03141
103150
1M320H5
LM324
LM340
LM377
LM378N
LM380
LM361N
LM387
LM555
LM703A
LM741
LM1303
LM1304
80
180
180
180
120
180
90
140
140
90
90
60
360
220
200
240
90
90
OD
70
CO
00
L91305
LM1037
LM1310
LM1458
1M1800
LM2111
L193064
/
03
00
00
20
00
00
260
Number
30 6 up
LM3065
LM3087
100
143070
LM3071
LM3075
LM3089
LM3900
M5108P
M5112P
M5115P
M5134P
M5142P
515152L
M5155P
M5192P
M5340P
1451171L
M511821
M51512
M51513L
M51515L
M51521
MB3105
MB3710
9E556
NE545B
PLLOlA
PLLO2A
S-409
540W
5-100WA
5-200W
Si -1010G
SI -1020G
S1-10300
S1 -1050G
S160025
STK0029
300
180
100
100
100
140
5.20
6.80
6.20
200
530
90
3.40
3.60
90
160
2.00
290
190
4.90
1.30
2.40
3.20
240
950
320
5.20
14.60
11.60
3440
4970
680
1280
17 90
2460
480
490
Number
$160030
5160039
STK0040
STK0350
5160055
ST60059
STK0060
0160085
STK0070
STK0075
ST60080
STK0105
STK0177
519011
STK013
STK014
STK015
STK016
516020
ST5024
STK025
516027
S16032
STK036
30 6 up
6.20
5.90
6.20
860
790
8.60
9.90
10.40
11.80
1150
12.80
13.90
10.90
360
8.00
7.20
3.90
4.90
490
7.80
7.90
9.80
820
12.20
STKO40
980
STK043
STK050
STK054
1450
516056
519056
STK070
516075
STK077
$77K(0018
S1Ko82
50K094
516086
ST5405
9.90
8.40
840
10.90
24.50
640
1480
1350
13 BO
9.90
16.90
493
Number
30 8 01)
1120
STK430
STK433
STK435
STK437
STK439
STK441
STK443
STK457
STK459
STK461
430
430
7.80
760
1180
15.40
9.60
10.50
1280
516463
1350
1780
TA-100WA
TA-200W
1Á7027
TÁ7045
1Á7054
T07055
1A7060
1A7061A11
70.706211
34.40
49.70
TA -00W
147063P
147004P
TA7066P
TA7070P
147072P
TA7076P
TA1089P
TA7092P
TA7093P
TA7102P
147104
1Á7106
10.7108
107109
10.7120
TA7122AP
10.7124
240
200
20D
225
83
120
1
20
80
80
70
160
260
3.20
ISO
720
3.40
3.20
2.30
320
100
500
90
90
1.20
Number
1Á7129
1Á7130
10.7136
TA7137
1Á7139
147140
1Á7142
TA7145
1Á7146
1Á7148
1Á7149
TA7150
1Á7151
1Á7152
147154
1Á7158
1Á7157
TÁ7158
1Á7176
1Á7178
1Á7200
10.7201
1Á7202
147203
10.7204
10.7205
TÁ7207
1Á7208
TA7209AP
10.7211
1Á7212
10.7215
10.7217
147222
10.7300
1Á7302
10.7310
30 6 up
120
9D
140
220
1.20
190
3.00
3.20
3.10
300
303
3.40
5.00
70
1
480
2.90
2.93
Number
TBABOOS
784810544
11349205
TC5080P
TC5081P
105082P
1002020
2)07034.
UPC16C
ÚP0200
ÚP0230
UPC27C
UPC29C
UPC30C
uPC480
20
UPC.413C
3.20
UPCBIC
1.80
4.00
1
1
190
240
240
192
160
260
260
300
2.50
250
440
320
380
180
140
120
3011 up
1A1214
TBA641
UPC157A
UPC554
UPC55H
UPC558
UPC-588H
ÚP0570
UPC571C
UPC572C
UPC573C
UPC575C2
UPC576H
UPC577H
UPC578
0P058102
UPC595C
uPC596C
UPC1001H
UPC1008H
UPC1020H
440
320
200
130
220
Number
UPC1025H
UPC1028H
UPC1152H
UPC115411
UPC115111
4.60
2.70
UPC.]156H
UPC1181H
UPC1182H
7.20
95
2.00
111101185
310
UPC1380
0806580
2 10
2.40
2.20
530
3.00
300
303
2.90
1OD
130
490
80
520
620
3.20
203
1.40
29D
110
8.80
O
1
200
220
410
1.90
Prices subject to change without notice.
Call These Toll -Free 24 Hour Hot Liles
1-800-543.3528
(In Ohio call 1-800-762-3418)
mçm',bur
TLX 288349
original Japanese
Inc.iconduc«
639 Watervliet Avenue. Dayton. Ohio 45420
CIRCLE 53 ON FREE INFORMATION CARD
30 a up
190
190
5.40
1'90
190
190
2.20
320
095
695
6.00
PLANS & KITS
The Original FCC Tests.Answers exam manual
that prepares you at home for FCC Fleet and
Second class Radiotelephone licenses. Newly
revised multiple.choice exams cover all areas
tested on the actual FCC exam. Plus' Sell
Study" Ability Test. Proven, S9.95 postpaid.
Moneybxck Guarantee.
-
26348 E
Francisco, CA 94126
P.O. Box
COmmanD PRODUCTIONS
Radio Engineering D,vmon
San
HIGHLY
PROFITABLE
ONE-MAN
FACTORY
ELECTRONIC
Investment unnecessary, knowledge not required. sales handled by professionals. Ideal
home business Write today for facts,
Postcard will do. Barta-RE-A, Box 248,
Walnut Creek, CA 94597.
ELECTRONICS completed kits. No wiring. FM
mic. VU meter. Touch control switch. Programmable music block. Wheel fortune game. Etc.
Save up to 50%. Write for free catalog today.
Postcard will do. SUPERTRONICS INC., 39 Bowery, Box 88, New York, NY 10002
BOOST CB/HAM modulation/range. Free information-plus plans/kits catalog. "SKIPPER",
Box 130-F3, Paradise, CA 95969
ELECTRONIC organ kits. The ultimate design.
Sounds like a pipe organ. Build it to sell or build it
to keep. Models for churches, homes, clubs, pizza
parlors. Send $1.00 for demo record and catalog.
DEVTRONIX, Dept. 70, 6101 Warehouse Way,
Sacramento, CA 95826
PRINTED circuit boards from sketch or artwork.
Kit projects. Free details. DANOCINTHS INC.,
Box 261, Westland, MI 48185
8 -TRACK TAPES
40 -MINUTES
CASSETTE TAPES
60 -MINUTES
....
69=
'
of
Rege
of Recording
Save us the lobo, costs of cleaning and
polishing and save SS SS on standard dial
telephones. Work on any commercial system.
Complete. I no parts missing
in good
working order. Your choice of desk or wall
models. These ore take-outs from commercial
service I not toys) Instructions furnished.
1
Olen,..
wellnew,
Desk Model
I
071$
1,95
.
.
t
,
4t4,M
FREE CATALOG Show.
MAIM
Mean PlelaS
Surplus Center
CIIIMICIS Selle/1114
Box 82209 -RE
Pl
C"
e
BIG
54YING5 On
Stnna
&&&&& DIMS
MANY
0.[IIS
Lincoln, Ne. 68501
POWER supply, regulated kit, limited supply 5V-1
to 3 amps out, 110V/220V in, all parts in schematic, supplied except PC board and bleeder
lamp. $11.50/unit, plus $2.00 shipping and handling, 6% California tax. SHOCK CO., P.O. Box
4332, Vellajo, CA 94590
CB/HAM Circularly polarized beam antenna.
Plans $4.00. Free catalog-plans/kits. PANAXIS,
Box 130-F3, Paradise, CA 95969
FREE
KIT
Catalog
AUTORANGE DIGITAL CAP -METER
KIT. Still the bust for only $74.95
MINI HOBBY MOTORS
Il
»es
114..11
Time
*Less Than 1¢ Per Minute
*Music or Voice Wt. 1/e lb.
lb.
Dial Telephone "SUPER BUY"
TEMPERATURE Adapter for DPM. Selectable °C
or °F. Kit $39.00. Assembled $69.00. Plans $5.00.
TEMPRACONTROL, P.O. Box 188, Lee's Summit, MO 64063
TA -879
180 Minutes
*Length For Recording Some LP's, etc.
rased-Not Used Shpg. wt. t/
SALE
-
TA -907
Quality Reproduction
Pkg.
TREMENDOUS BUYS In New
And Gov't Surplus Equipment
415-447-3433
Phone
24 VOLT SOLENOID
contains
TEST
&
EXPERI-
Write or Phone for FREE CATALOG. MENTER'S
Average minute Saturday call is 21Ç. EQUIP.
1
KitlJ
of
694
3-6 VDC Shpg.
wt.
1/2
lb.
RegeSZ
JUMBO L.E.D.'S
t
PL-23REEN5
Ilr
Br
*Gallium Phosphide
Wt.
lb.
1/4
99s
*Hum
Balance
Controls
5 PAK
Reg.
2V-10mA
Reg.
TRIM POT CONTROLS
VC -320
Reg.
SA
G
ORANGE
PL -249
*Size: 11/4 x 3/4 x 3/4"
*Styles May Vary
'h Travel *Wt. 1/2 lb.
MO -333
*For Toys, Projects, etc.
59s
SW -873
Wt.
1/2
Pk 9
g. of 10
lb.
DAGE
SCIENTIFIC INSTRUMENTS
BOX 1054R LIVERMORE CA
94550
PROJECTION TV.
Convert your TV to project 7 foot picture. Results equal to $2,500 projector. Total cost less than $20.00. Plans & lens
$16.00. Illustrated information free. MACROCOMGF, Washington Crossing, PA 18977
PLANS: PCB layout for sound activated light with
dimmer project from R -E's January new ideas
section $5.00, engineering design console for TI's
new SN 76488 complex sound generator $10.00,
circuit displays BCD on LED bargraph $5.00.
HOLMES, 15841 Redlands St., Westminster, CA
92683
.
.
.
NEGATIVE ion generators, build one yourself
with easy -to -get parts and save 50% to 75%.
Includes ozone check. Plans $5.00. LUNATRIX,
Box 891, Yucaipa, CA 92399
SPEAKERS. Save 50%. Build your own speaker
system. "Free catalog" write: MC GEE RADIO,
RE 1901, McGee Street, Kansas City, MO 64108
9 VDC HORN
XM-808
A djustable
1
Square Frame,
,
le.
Pentrating
*Wt. 14lb.
1
(Mk
h" Diameter
777
Y4 Deep
Loud and
Round Yoke
16 Ohms
Shpg. Wt. lb.
Reg.
Ye
Dept. R-3 260 S. Forge SL, Akron, Ohio 44327
NAME
ADDRESS
CITY
STATE
Oty
Description
m,,,,
Owp
Carl
Nu.Nt
E BAMK
Price Ea.
Total
Tax
AMERICAN
7 MA8TER CHARGE
I
fill
money where
your Heart
is.
ZIP
Stk. k
Put your
Postage
Handling
&
51.00
Total
Please send me a free subscription to
Olson Value Packed Catalog. (Within the Continental
USA Only)
American
Heart
Association
WE'RE FIGHTING FOR YOUR LIFE
ADVANCED
THE FIRST TO OFFER PRIME PRODUCTS TO THE HOBBYIST
AT FAIR PRICES NOW LOWERS PRICES EVEN FURTHER!
COMPUTER Proven Quality
PRODUCTS a9# Pop.:O 1980 CATALOG AVAILABLE SOON.
Vfr
iJoto
"'M0í,1.!
-
"
5.10032K (uses 2114)
* 16K with Jumpers & Instructions
for either Level or Level Il
* 16K for Apple II Upgrade
* Special: TRS80 Schematic
* Expansion Interface Schematic
Kit
r/airASSEMBLED
450ns. 539.95
45ons. 599.00
250ns. 599.95
250ns. 699.95
49.95
Bare Board
Bare Board w/all parts less mem. 99.95
RAM 65 (16K Static w/Memory
Management)
4 MHz $399.00
2 MHz $299.00
RM 10 (16K Static w/Bank Select)
4 MHz $329.00
2 MHz $249.00
(16K Assembled & Tested Using Low Power
I
* Expansion
Interface Connector
EXPANDORAM
3 color code, 55
positions
Immune to static charge
Low Dower
15.00
Optional
stand
89.95
395.00
S-100 ADD4N MINI-DISK
UV
VISTA V-200 Minifloppy
Model S-52T... $255.00
TARBELL FLOPPY INTERFACE
Uses CPM
* 280/8080 S 100 Compatible* SASE
$26DÁ6
Bare Board
1699.
Subsystem
Note: For CPM Add $70.00 Documentation Add 520.00
& Tested
NEW CENTRONICS 730 PRINTER
LOW-COST ADD-ON DISK
SUBSYSTEM KIT
*
*
$945.00
Z-80/Z -80A/8080 CPU BOARD
included (450ns.)
* On board 2708 ** 2708
socketed
* Power on lump completely
$185.00
Tested
face Cable
CP/M Disk Operating System
Box of 10 Diskettes
IMS STATIC RAM BOARDS
Mapping * Low Power e4°t
* Memory
* Assembled & tested
* Phantom by Alphamicrosystems
Recommended
8K Static
16K Static
32K Static
450 ns.
$189.00
$399.00
$699.00
250 ns.
$209.00
$449.00
$799.00
*
,,,S
Qp\?
Sector Z01S(
mPtt;5
5/4" Minidiskettes
Softsector, 10 Sector,
$4.25 Each, 10/39.95
8" Standard Floppy Disks
0156
Soft Sector, Hard Sector
$4.50 Each. 10/41.95
'Add 4.95 for 10 Pack in Deluxe Disk Holder
*
*
9603-0
9600
96103
96702
Also AMI EVK System in Stock
P.
0. BOX 17329
$ 99.95
$149.95
S-100 MOTHERBOARD SPECIAL
Special buy while
supply lasts.
8" Drive with Double Density
$449.00
90 Day Warranty
2t1<Ld0500s.
49.9
GAS 990031
95
19.50
19 95
29.95
CP1600
6502
8502.
186100
8900
6802P
8055
0,1.109140,41
19.95
49.95
SUPPORT DEVICES
280 P101
9.95
i.2
50
0224414809/
55
385
239
8226 Bus Drover
8126 Bus Drover
82285m
5.95
6.25
6.95
CogVo1
6238 Sys coot
8251 Pros. 1,0
6253 Int Temer
8255 Pros. DO
8257 Prop DMA
8259 Prop Int
1950
6.95
17'95
1795
49.96
1595'
8275 CRT Connote,
8279 Prop. Keyboard
68101128,8 RAM
219
w/anM
Reel Mi
Vd. II Some Real
Vol.1
VdoIII Sane Real Support Dev9es w/Bihar
Vol,
nob Micros vd,m
SME
DILRIIIYN
comment 600[1
understanding Computen
8080M,crocomputer Eomvn,eda
onnong
BBee9,nnels
GOea.C, 6 Gusto
Peanut Buyer 8 Jelly Guide lo Canpulele
8080 Macn,ne Language Propesmmirg
Home Computers IC. H5rdeet8
Home Computen Vd. II
Starship S,muAtw
I
So..
325
2.50
~
25.95
Havetor
825
2.39
6
68880
Ben Driver
.18.9
25.00
K RAM
SCD 266 , 4 RAM
CD 32 , 8 RAM
I
16.95
9.95
1095
1852 CD 801170
1864 Uan.
1856 CD I/O
109
895
695
CD 170
6520 PIA
50
9.25
7
,
6522 Mull
6530004
1550
1550
1550
6530-005
15 50
6530002
5530-003
DYNAMIC RAMS
418/4118 166 (18 P,nl..
381 á 8416'5
41158K(18Fan)
06046x1(14
0604Ks (22
0946
1000
201MHz
2OWIS M.
24576MHz
35/554501Hz
CMHr
30.Hr
499520MHt
hob
Some'o
11 43161111
1
x
1
985
6995
695
Pon)
395
027 46.1
(16 Pont.
.4.95
5261..
5262..
195
5270
4.95
5280..
495
5290
1245
1103
4008L
6605
6604
6002.
1.95
095
795
1
1
9
5610
2
3.95
0715101315V, 12V)
4.95
695
695
550
7.95
IM6402
118403
2350 (ART
16710 Aaros
895
9 95
2495
9-N
SALI 3514744
11.95
la 95
4/02
995
ÁV62376
0053500
HD019
740922.
13.75
13.75
9.9
99
99
74C923
6.95
Irvine, California 92713
1350
O
22
13.50
7 25
1395
395
1408L866,í
+408L880í
5.95
5 95
DAC01 ND
5.95
895
1295
.595
8.95
30
3495
3005
e85M1.
27.95
Molher8oºrd (*MCI
13 Sid01Mol
9 Sloe Monter BceN Seá1C I
e Slot Mottera andegel
3295
29 95
34.9
WAVEFORM
GENERATORS
80 38 FunCten Gen
245
175
5 25
FLOPPY DISK I/O
611000y
1771-01
`íN372
95
3
C40245CO
18566 VCO
x01206 Funcl,on Generator
2795
49 95
29.95
N4o4 Flop100py
1781 Dual Floppy
1791 Duel Flow,
39.95
TV INTERFACES
Pnw'Vener
N
1
8.50
695
3500
3500
Voreo Interface
leeroveder
MOR Modulator
MK 3870 (programmed)
1.50
AM 9060 (4K RAM)
3.95
27S08 (32 x 8) ...1.95
75
75492
2/9.95
8080A CPU
2716 Eprom... 2/49.95
76477 Sound,..2/7.50
16K Rams 200 ns.
100/6.95 ea.
. .
NOTICE: WE DO CUSTOM PROM PROGRAMMING
COMPUTER SPECIALS
LIST
II Plus w/166 1195.
995.
PET 2001.166
Exidy Sorcerer w/aK 895.
Apple
Cornpucobr II w/8K 149.
6585.
Cromemco Sys III
1849.
Horizon e/326
TEI P1208 w/32K
1
SALE
990.
895.
795.
1395.
5475.
1559.
dual floppy 8 CRT
4995.
II med.)
Pascal MÍCroenQlne 2995.
*
*
LAW.
L
DS Red, Yellow, Green .185
0P708501AT3115
IPSI 1620 Diable RO 3295.
Anadex DP 8030
Centroncs Miao
Centronics Micro
2495.
2395.
*
5100
99
129
1.15
MONTHLY IC SPECIALS
6.95
LF13508 JFET Pones Multi 8 bet
Corner
17 95
ICM7207 0ºx4410 Controller
IC/47045 Preciaon Sío/Walcn Toner
6 95
22 95
1017107 311 0,9.1 820 (LED)
14
ICL8211 Voltage Reference
LM390 Battery OP. Aude Amp
LM1650 Grouml Faun IC.
LM 1800 Phase Lock Loop FM
L141820. 0500
7620
7524
7525
140646
3/ 100
See.
3,100
3/100
3/1 00
75
225
093825
75
73
4,9.9
95
1.95
1491
75
75322
10147 ECLRen.
/5
_.
99
2/199 LF356HESFet. 3/1.99
+488/1489
05.... 895
22 Pin ST Socket 10/1.00
..295 74589.
3/1.99
8223 Prom ..
8/1 99
2/1.99 74107N
MK5014 CYc
....3/+99754529
8/199
74141N...
10/1.9
961190
99 2410.14
8281
50
5505
á458G5
P-1
S-1
Some 10 120
Teletype Model 43
HiPlot Plotter
HIPlot Di911i1e,
Intertube II
SOL 20
MCI 2 Photo %STRHFE250,30V
4525R410%STRHFE250,30V
4N33 P1910 Dedln9lw
TWX: 910-595-1565
CIRCLE 37 ON FREE INFORMATION CARD
695
99
21L02-4 (450 ns )
21L02-2 (250 ns.)... 1.15
TMS 4060 (pullouts)
1 95
4.95
P8251 Intel
...
5.50
FCM 7001 Clock
MM 5311 Clock...4.50
MM 5314 Clock . 3.95
4.49
MM 2114N
17.95
8085
Phone (714) 558-8813
For International Orders: 1401 S. Borchard, Santa Ana, CA 92705. (714) 953-0604.
4
SPECIAL PURCHASE
(while supply lasts)
ICM7208 Seven Decade
BAUD RATE OEN
MC14411
118
..4 95
1095
95
TR1602615V.12V1
TAIS 6011(5V.1214
_.15
TIL 311 hessdeclikw41
MAN 20.320" bed Alpne-Numenc
MAN 100.270' Red Aloha(Numenc
10.75
14.50
4551015A/186315171
99
99
nL 39
9.50
10.95
14.95
10.75
AV51014A/16121514VI
9
99
TX306 Nenname wao9lo
TL 308 Number w/LoO.
mL 309 Number w/Lwlo
1495
.....
1.15
1495
8 95
14.95
Upper
99
175
.1.75
HP 5082.7340 Red Hexlde0imal
HP 5082.7300 Red Nennen
29.95
9 95
12 95
9
NSL
EArs *
amen+857
amen*Become
15.95
z9.9
1195
..99
*max
S
520490
68341
C15205.8 51.95
CTS2069 51 95
CT5206-1051.95
Parallelnoce
Red......... 99
Dgit Fluorescent 300-
99.00
31.96
5.95
794-
48.04491
100KC
75
CT52066 Sf
34 95
27.95
Vector 8800 Protes...... 22.20
803 11 sel MB... 29 95
1595
ACP Exr4Mer w/Conn
ACPEaI
Video Interlace IS5M1
31.95
595
595
1295
Bexel tor MA1003 w/Red Filler
MÁ8002Á LED 12 N. Clod Module
750
395
8703 8 bet T5
9400 Volt to Fre9 Cony
87503.1/2 Dig. BCD
.'P95
795.
360801
14Á100312V Auto Clock Module
9 95
52030,0
15171
595
595
HP5082-7731 (CA) 300" Red.
9 0,011 Bubble Mini Calc. Display.
9 D91í Panegea Display .400'
4 95
02A
2732.
2716817
2765-5V 12V
2756 5V
595
495
20 01.81r
221184MHr
270MHr
IAN 3382 áO0' Green
795
2708
195
T86á 1195
180251Hr
.
4.95
PROMS
87008 Stana,6.
8701 10 I Rrury
6.95
5.95
6.95
50
495
595
595
a95
895
595
51 75
CTS2065 5115
16K
,c RAM 121141
32K Stabc RAM 121141
Floppy I/O per0e111.
Cassette I/O (Taradl.
OK Eprom (27081
1/02 Eprom Bard...
2708/2716 Eprom °theca,
2/08/27+6 Eprom 68.C1
Raltlme Clock
ACPAolo Bd. CM Conn .l
4.95
..
END 357 (CC) .357" Red
END 500/503 (CC1.500' Red
FND 507/510 (CA) .500' Red
END 800/803 (CC) SSO" Red
FND 807/810(CN.800' Red.
.1 .95
A/D CONVERTERS
95
585
4.75
KEYBOARD ENCODERS
7
65536
OOMHr
1301.Hr
1431818
18 014H
5
5
4.25
4.95
Pin)
(16 Pon(.
210446, 1(16 Pon(
175
29S9 leso
SALA
09A.
13.95
585
295
C1S206-' S115
Cr5206a
1,60 Cpt, Omacal
80800 CPU
80 SlamSlateRAM (Logo.Slat
495
095
495
495
495
495
5
6 144
95
204444/
4
60MN,
5585
OMHz
I
DL 70-1 (CC). DL 707 (CA1.300"
687141 0MH905C
1822
1824
325
CTS DIPSWITCHES
NAKED PC BOARD SALE
,cro reqe 8 Timesimeella Oa.
Price
Frequency
FrequencyPrice
DISPLAYS/OPTO/LED's
7 NIONENT * CALO * CLOCKS
80420
6892
6.50
4.25
43/86 W/W. ST, MOT
CRYSTALS
595
38.95
8.95
11 95
6860
3.75
1.26
56 50
áw1005100 Connector it
50/1005100 Connector si
5.95
4á5
m1
68341 512.8 Eprom
6850 .CIA
6852 Send Mader
68457 H046505CR1 C..nl
W01941
7.75
7.50
3880 27.50
2900 18.50
195
395
325
DB255 Female
Hood..
Sel w/Hood, Sae
22/44 WAN. 5/r, KIM
95
21
850
6828 Prior.,
7.75
7.75
o
725
UARTS/USRTS50
9
8800 Programming
55°51K11CMOS
4516964gIRent
795
25
CHARGE COUPLED DEVICES
575
95
5820 PIA
6821 PIA
MCM65710
11
1
95
2
MCM6574
Vd.
Intro to
Programming
mm,g
8p00Árogra
7
$18.95 each (reg. 43.001
9.95
29.9
1.CM6571
795
495
NSC TTL Date.
595
NSC Lkleer
395 »AD Schdlky Dalebook..4.95
NSC Linear Ace Notes
39
395 AMI MOS/LSI Data
NSC CMOS
49
395 01 MOSASI Data
NSC Memory
4.95 Harns Analog Databook...4.96
Intel Ddab0ok
3
Intel MCS 85 Manua.. .7.50 11 Linear Conlyd Data
SMx 050015110 BOOKS e SIMA
0825P (052321
125
35
489
14.9
2513005 (544 Lower
2513-M8.315V) Lower....
Intel MCS 60 Manuel
...3.95 Intel MC50 Mena)
4.95 AMO 801304 Manuel
CONNECTORS
75
7
Ib w/Rem
24 Pm 5750
9 25
95 Each
S1 e
1
93
0 25
14.96.
2513001
49.95
CCD Omy
95
B5
110
l6 Pen S 5.50
40 Pin 510 25
25
925
10 25
3583 510
3884 DMA
CHARACTER GEN
COMPUTER BOOKS
4.75
795
525
9.95
1150
795
1025
60
W W
TEXTOOL ZERO
INSERTION FORCE
SOCKETS
4195
7.25
388241dMHa
3881.4 MMHW,
3882 (Z-130 GIG,
Bell 103
Answer, Originate
$29.95
875
6 75
6 75
675
155 CCD' Fnsl lime onered Fa,rcmm 460 CCD
page ccD
166 no rnory Ia
6ppf09reasonable price
technology
Ocanplyl,m,ladl
ch
ten note suool,esw nneaorder
825137....
$189.00
8C5
WW
WW
WW
(WW 1I5
I
1LM
6.9
825115512 8
2.50
825123 32 x 8..
3.50
625126 256 , 4
x
4
(7.........3.50
825129 258
550
512
x4105)
825130
295
NSC DM757832 x8
695
62523
ACOUSTIC COUPLER SPECIAL
1.10
3.55
2.65
2.55
2511
0M9519umversatIntenuq
3881
15
2147LayPower4KStatK 14.954e.
0
95
24.95
145
55
t
P2125793425 145 ns 17 95
8155
519500
NOVATIONTICOD
tro to M6ra Vol. 0
FSC80.46416K
001
CALL
s CALL
1ÁL532, a
DS)
0-300 Baud
197910 MeStx..
5101GE
updd101a2001
825131.
DATA BOOKS
EMM41104
13.95
2495
15
1
1
065
285
270
']:55
795
1250
795
1095
1095
E884402
S
04495114455 Processor
AM 9511-1 300 ne
8449517 DMO Controller
2.90
1é.95
7 50
21141,4504.
9.95
4044/4041 3300ns.
4044/4041 45011a. 7.50
975
E1.1842004
12.9
19.9
2901
IM
ACOUSTIC
OF SURPLUS UNITS
AVAILABILITY LIMITED
27.00
55.00
55.00
55.00
9y0U6 1
27066
SPECIAL PURCHASE
0800 BARE BOARDS
$45.00
45.00
45.00
50.00
*
AJ MODEL A30
MOTOROLA EXORCISER COMPA11BLE
$495.00
9600 MPU Module w/6802 CPU
175.00
9601 16 Slot Mother Board
9602 Card Cage (19" Retma Rack Mount) ...75.00
100.00
Mother
Board
8
Slot
9603
Supply
250.00
9604 Switchnrode System Power
38.00
9610 Utility Prototyping Board
9616 Clued 8K Eprom Module
9620 16 Channel Parallel I/O Module.... 295.00
...
9622 Serial/Parallel I/O Combo
295.00
9626 BK Static RAM Module
495.00
9627 18K Static 450ns
88.00
9630 Card Extender
9640 Mukiple Programmable Timer
395.00
(24 Timers)
395.00
9650 8 Channel Duplex Serial I/O
275.00
96103 32/32 I/O Module
350.00
96702 32 Point Reed Relay Module
9620-0
9626-0
9650-0
9601-0
$129.95
$ 34.95
SIEMER'S FLOPPY SALE
Model DP -8000 compact, impact, parallel or
Sprocket -dire, 80 cols,
bi-directional.
844
$895.00
New only
*16
Z-80 Assembled and
Z-80 Kit
Z-80 Bare PC Board
For 4MHz Speed Add $15.00
8080A Kit
8050A Assembled
8 slot expandable w/9 cono.
NOW $52.95
reg $69.95
ANADEX PRINTER
FLOPPY DISKETTES
Uses any paper roll,fanfold,
single sheets, 96 character
ASCII, 7 x 7 dot matrix, 50
CPS, RS232 or parallel I/O
WOW
* (2) 8" Drives
* VISTA Floppy Controller
Card
* Power Supply and Inter-
14 95
1145
8085
1821 SCD
Vista Double Density 51/4" ComrollerAesem.....5299.00
$299.00
SD Versa Ebony Kit II
$389.00
SD Versa Floppy Asaembledll
$115.00
Tercel Cassette I/O Kit
$27.95
Sale *1771-01 Floppy Chip
VISTA Floppy Controller 8" (Shugart Comp.).. -$259.95
art 8" Disk Drives
& Power Supply
*r Case withFanController
VISTA Floppy
Fully Factory Assembled
$269.95
$179.95
$39.951000. Add $10.00)
Kit
-tot
VISTA V-1000 Floppy Disk
$69.95
5
Professional Industrial Model
Assembled for Shugart
Assembled Other Dnve,
SUBSYSTEM
Operating
C P/M Disk Oper
Model
Holds 4 Eprom's at a time
5 years
Bacixed by 45
experience.
System
204K Byte Capacity
V-200
Double Density Drive
699.00
CP/M & Basic "E"
Double Density Controller
Case and Power Supply
Assembled & Tested Ready to Plug In
EXIDY, HORIZON, SOL, etc. Compatible
S-100 ADD-ON DISK
*
*
*
"Eprom" Eraser
2.95
19.95
21121
21011
8205/745138 Decoder
8212 8 5,100
8214 Poore mt
8216 Bus Diver
8224 Clocº Gen
ASCII
Only
*
.
Full 128 position 8 -bit
New Double Density
Expansion Module $239.00.
2 Drive Cable Add 529.95
4 Duce Cable Add $39.95
.
8088
TASA touch activated solid
state KEYBOARD
-
130500-414Ha
88909
.
375
25
I
125
2111
995
64K $519.00
9.5" adjustable tractor
TIGER"
feed, parallel & serial I/O,
132 columns, software
selectable character size,
110,300,600, 1200 baud, to 198 CDS 5995.
$199.00
Graphics option w/2K buffer add
* 23% More Storage
Capacity 40 Tracks
* 40 track parch tree
*
*
*
48K.5439.00
MODEL 440"THE PAPER
VISTA V-80 MINIDISK
2650
CD1802
80800
130
1.59
21L02 450ns
21L02 25018
2102
1695
1695
1895
1795
z -130A
F-8138501
29010
MEMORY KITS
FROM INTEGRAL DATA SYSTEMS
TRS-80 ADD-ON DISK
**
$69.95
$69.95
$ 4.95
$ 4.95
7.95
Uses 4116 200 ns.
Power 8VDC, ±16VDC
Up to 4 MHz
Expando 64 Kit (41 16)
16K $248.95
32K $358.00
LOGOS 18K
ASSEMBLED
125.95
450 ris. 149.95 KIT 450ns.
250ns. 149.95
169.95
25055.
$21.95
w/Data
Bare PC Board
"Special Offer" Buy (4(8K 450ns. Kits $117.00
*
*
11
* Bank Selectable *
* Write Protect **
* Phantom
¡fir1
2114's)
Send $1 .00 to reserve your copy of the most complete catalog of computer
products. A must for the serious computer user.
STATIC RAM HEADQUARTERS SOCKETS
MICROPROCESSORS
5 CALL
28000
100
259
1.24
APPLE/EXIDY/EXPANDO
TRS 80 16K-UPGRADE KIT
RAM BOARDS
STATIC
Factory tested products only, no re -tests
or fallouts. Guaranteed -money back. We stand behind our products.
5,.99
3, 99
995.
596,
595.
995.
1349-
2695.
895.
895.
525.
795.
1150.
1085.
899.
795.
895.
735.
785.
1095.
TV CHIPS/SOUND
Á7385091 6 Gamete 87.5.... á4.9r
2 95
ÁY38515 Color Convener
Á138803.1 Rosdr5ce tame ...895
AV386061 Warfare 9410e....950
4738606-1 Wipeout Game.. .950
0V36807'1 Shmn19 GelAry...89
Á738910 Gown, Cna rm Sound
12.95
Generator
5678477 5 502E O.n.nl
MA15320/21 N Synth Gen
x...09
.9.9
886389 Preeceler
LM1889 RF Modulator
MM571000 NSC Colo,
Game
MA157104 Clock Gan
RF
3.95
.395
N
8.95
....3.75
Module. w/Audo
8.95
All Shipments FCM or UPS. Orden
under 5100.00 add 5%55001119 and
postage. Orders over 5100.00 add
2.58 handling6 pcel5pe. Maeler-
merge/
COO
tome
of A
,¢aged /.25%
m
0400Eí Gab
Eaten
8% hand) 9. út
180 guaranteed
prime factory
AddA 35 cents uDal
from
Rama
P1i0
ul pE,rp wgacn b
change without nollcw.
sa
141101451
ÿ.
-
Retail Store Open Mon.
Sat.
Located at 1310 "B" E. Edinger,
Santa Ana, CA 92705
r
7400
,I ff
S4740014
5474014
.16
.18
SN74024
54740311
S4742414
.18
.18
.18
S474054
5474064
.20
.29
S471824
S47407N
.29
.20
.20
9474004
5474091t
9174104
.18
.25
54741114
54741214
25
./0
54741314
5474144
54741614
5674174
5474204
51174214
.20
.29
54742284
51474234
.39
.25
5474254
S474264
SN7426N
29
51474274
54742914
51174904
04743284
Inc
29
.29
.35
.35
51174160N
51474161N
.49
567/1625
S1474764
.35
SN741634
5574794
5.00
59740011
SN7/1614
54741656
S47483N
.50
.99
.59
S474854
.79
514741704
58474864
01474894
.35
1.75
.43
8471172N
54741734
$4741744
SN741754
54741764
.43
.65
.65
51474177N
514741794
51471180N
.65
5474181N
5474182N
5471184N
5474905
45
S47491N
.59
01474924
54749314
SN7494N
.70
.25
.25
S474954
08474965
300
584749714
514711086
.89
54741074
54741095
.35
.59
.29
.25
.39
5474116N
547412114
1.95
.35
S4741224
.39
20
547112314
.49
S4711675
.25
04741256
.49
.25
5147/12694
.49
25
547419111
04741324
547413614
.75
.75
0474424
5474434
.25
.20
.89
.49
.75
S4741414
54741124
S4741434
.79
2.95
2.95
54741954
54741964
SN74197N
SN741984
547/19914
5474144
5574419
.75
067/454
2.95
.79
.75
.69
55711474
1.95
547114814
S474484
54745664
.59
.79
.20
547/1504
54741514
8474514
5474534
.20
.20
5117115344
1.29
.89
.59
.59
.59
.99
55745414
20
547459A
.25
.20
5147146N
5474174
54749014
.23
.23
.23
C24001
004002
024006
1.19
CD4007
.25
00/009
19
CD4010
.44
004011
C04012
004013
.23
.25
39
1.39
1.19
.49
CD4014
CD4015
CD4015
CD1020
004021
001022
CD1023
CD1024
CD4025
CD1026
004027
1.19
99
49
1.19
1.39
1.19
.23
.79
.23
2.25
69
74000
74002
74024
74008
74010
74014
74020
74030
74042
74048
74073
74074
.39
.39
39
19
.39
1.95
.39
39
1.95
249
.89
.89
78MG
LM106H
1,75
.99
11430011
80
.35
.75
1M301CN/H
LM302H
114304H
1.00
.60
.35
L1430511
1M30704/11
LM308CN/H
LM309H
LM309K
15131004
LM311NM
1M31211
LM317K
1M318CNM
18431914
LM320K-5
LM320K-5,2
1843206-12
LM320K-15
18320K-18
161320K-24
1.96
1.10
1.25
1.15
.90
1.95
650
1.50
1,30
1.35
1,35
1.35
1.35
1.35
1.35
I11320T-5
1143207-5.2
LM3201-8
1M320T-12
LM320r-15
LM320T-18
LM3202-24
1.25
LM323K-5
525
119
11832414
1.25
1.25
1.25
1.25
1.25
1.25
LM340K-6
.99
1.35
1.35
183406-8
1.35
1M340K-12
114340K-15
1.35
1.35
11833914
1513401(-5
741500
741501
741902
741503
741504
741005
741508
741.509
741510
741511
741013
741514
711515
741020
741021
741522
741526
741527
741528
741.530
741532
711537
741540
741542
S4741524
5474154N
04711554
1
.79
.79
.65
047415681
54741574
XC556R
005560
XC556V
X05560
1.49
1.19
4.95
S147439014
51474393N
29
.29
29
.25
.29
.35
.2º
75
59
1.25
35
.35
.35
.35
.29
35
45
.35
.89
CMOS
1.19
C04076
004081
1.39
.99
0134082
23
C04029
524030
004035
C04040
004041
1.19
1.25
w
004042
004043
89
004044
CD4046
89
1.79
004047
2.50
C04048
004049
C04050
C04051
C04053
C04056
004059
CD4060
C04066
CD4068
1.35
.49
.49
1.19
1.19
2.95
9.95
1.49
79
39
C04069
45
74C00
2,49
1.95
1.95
1.95
1.25
740151
290
740154
740157
740160
740161
3.00
2.15
2.49
2.49
LINEAR
LM3404-18
1.35
114340K-24
LM340T-5
1.35
1.25
183401
1.25
1.25
1.25
1.25
1.2$
1.25
1.00
1,95
3.25
4.00
LM340T-8
L8340T-12
18340T-15
L83401-18
LM340r-24
LM358N
1143704
LM3734
18/3774
1113804
LM380CN
LM381N
1.183824
14E50114
NE510A
NE529A
5E53111/V
NE536T
NE540L
4E54414
NE5504
425556
NE556N
485660
11E56213
NE565N81
NES66CN
NE567v/H
NE570N
LM7030NM
LM7964/H
1.25
.99
1.79
1.79
8.00
6.00
495
3.95
8.00
6.00
4.95
740163
740161
740173
740192
740193
740195
740922
740923
744925
740926
80015
80097
Oreen
.59
11.11310N
155
L81458C441
.59
MC11884
.1,95
MC148911
1.95
161556V
.95
1.75
MC1741SCP
3.00
114119681
1.95
11429014
2.95
LM30535
1.50
L43065N
1,49
118390014(3101)'.59
11839054
119
1839094
1,25
1.105558V
.59
80388
4.95
11475450N
-49
181211114
75494C4
BC4136
125
3
RC414
4.95
RC4195
449
7415138
7415139
741S151
7415155
7415157
7415160
7415161
7415162
.89
.89
.89
.00
.89
7415163
7415164
75
7410102
7415193
741514
.99
7415195
7418253
7415257
.99
.49
.89
.89
.89
R04151
.75
89
.39
.39
.39
,79
7549314
741595
741596
7410107
1.25
39
7545304
.59
45
.79
.39
.55
1.00
1.19
.35
.39
.79
.39
741590
741592
741593
.45
8.95
8.95
1.90
1.50
LM7394
18/74104/H
114741-14N
1M7475M
1M748NM
45
.49
.89
1.25
,45
7415109
7415112
7415123
74LS125
7415132
7415136
825
1517231481
18473314
741576
711578
741583
741585
741586
1.15
.45
2.49
2.49
7.95
7415115
7415181
7415190
7416191
7415258
7415260
7416279
7415387
7416388
7416670
95
1.15
1.15
1.25
1.15
1.25
.99
2.49
1.15
1.15
1.15
1.15
1.15
' 1.15
.90
.85
1,75
.W
.75
.75
.75
249
AY -5-9200
AV -59500
AV3-2376
HD0165
74C922
740923
Bytesaver II
@ 0.13A
-18V
@ 0.2A
@
$245.00
XCS26R
XC526G
green
5/51
4/51
yellow
4481
clear
4/51
red
00526Y
XC526C
red
801116
X01115
00111Y
X01110
6/81
INFRA -RED LED
1/4111/4111/16" flat
5481
red
green
yellow
clear
D
MAN
MAN
MAN
POLAND'
4
7G
MAN 7Y
MAN 72
MAN 74
MAN 82
MAN 84
MAN 3620
MAN 3630
MAN 3640
MAN 4610
MAN 1640
MA11710
MAN
MAN
MAN
MAN
MAN
MAN
4730
4740
4810
1840
6610
6630
MAN 6640
MAN
MAN
MAN
MAN
MT
Common Anode -red
.270
5 a 7 Dot Matrix -red
.300
Common Cathode -red
.125
Common Cathode -red
.187
Common Anode -green
.300
Common Anode -yellow
.300
Common Anode -red
.300
Common Cathode -red
300
Common Anode -yellow
.300
Common Cathode -yellow
.300
Common Anode -orange
.300
Common Anode-orange 0 1
,303
Common Calh0da'orange
.300
Common Anode -orange
.303
Common Cathode -orange
.100
Common Arwdemrad
.400
Common Anode -red y 1
.400
Common Cathode -red
.400
Common Mode -yellow
.400
Common Cathode -yellow
.403
Common Anode -orange -20.
,560
Canon Anode -orange x 1
.560
Common Cathode-orange -D.5..560
Common Cathode -orange e 1 .580
3
4
5/$1
4/51
4/$1
4/51
6650
6660
Common Anode -orange
6680
6710
04308214
0430466
0A30596
0090806
0A3080T
00308114
200
CA36004
1-24
.517
IC
25-49
.16
.19
047034
8 pm LP
14 pin LP
16 pin LP
18
0A30836
Cp3086N
06309011
0831901
0431401
CA31807
CA34016
20
on
LP
20 pin LP
14 pin ST
16 pin ST
18 pin ST
24 pin ST
.85
14145738
SOLDERTAIL
50-100
.15
.800
22.50
4
a 7
Sp. Opit-Hemdeomal
52.95
2.95
14145311
1.00
75
.75
81115316
84845318
4.95
4.95
4.95
6.95
9.95
1815369
295 1404024P
M85367/19988
1.50
CT7001
4,95
6.95
MM5312
200 MI85314
_
.30
f.30
15
27
42
.35
.38
.32
.35
39
16 pin WW
18 pin WW
20 pin WW
43
.75
38
42
.68
b5
.79
36
37
68
.4
.32
14 pin WW
25.19
.38
28 pin LP
36 pin LP
.21
.25
.37
37
M04040P
Mf124411
22 pin
ww
24 pin WW
28 pin WW
38 pin VAN
40 pin WW
ASST. 2
ASST.
3
ASST.
4
ASST. 6
ASST.
7
15 OHM
11 OHM
22 006+
39
01e
47 OHM
56 OHM
100
00M
120 OHM
150 OHM
33 OHM
68 OHM
82 OHM
5
ea.
180 OHM
220 OHM
270 OHM
330 OHM
470 OHM
503 OHM
1,56
680 OHM
820 OHM
5
ea
1,24
5
ea.
3.36
8.26
22K
ASST. 5
OHM
27 OHM
390 014M
1.8K
2.25
2.76
3.96
4.75
5.66
6.66
106
12K
156
186
274
336
394
476
566
684
824
10011
1204(
1804
2206
3305
ea,
3904
4706
5606
2701
6806
IM
I,2M
r.5M
1.8M
5 ea.
2.1M
3.3M
3.9M
4.7M
5
ea.
1290
1.45
s
65
95
.95
1.05
1.40
125
1.59
1.75
1.45
1.55
50 PCS
50 PCS
8206
.85
1.10
1.30
1.40
-5%
$1.75
1.75
10pí
lameco
ELECTRONICS
- WORLDWIDE
ADVERTISED PRICES GOOD THRU MARCH
CIRCLE 26 ON FREE INFORMATION CARD
www.americanradiohistory.com
1000 PIV
28
28
28
164735
164738
164738
25
28
28
1144712
144744
141183
141184
141185
141186
141188
8006
Ca
300V
Gr
75
10m
35
lOrn
5.1
le
5,8
6,2
8,8
8.2
iw
tw
1.25
2N3055
MJE3055
243392
243398
.89
1,00
1443567
P93568
PN3569
MP53838A
MPS3702
243704
weans
243705
MPS3705
243706
81PS3790
243707
243711
2537240.
2N3725A
243772
.85
1.00
2.25
1.00
5/1-00
2143823
05 54
5/1,00
5/1.00
3/1.00
4/1.00
4/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
5/1.00
msïG1RCICRópis
i
220 p
470 of
.04
.04
,03
.03
.019F
.0229F
.05
05
.04
03
.035
04
1968011
.12
MINI
10
.07
10
10
.07
12
.10
.28
.28
.23
.17
2.2/358
23
.17
3.3256
28
28
.23
.23
.17
6.8256
28
.28
.23
.17
152561
.23
.17
.17
2226V
.13
.10
.47254
14
.12
.11
.13
.10
.47/50V
1.0/160
1.0/256
1.0/506
.33
1000/16V
2290/16V
55
100/506
28
28
Imo
lw
15
28
50 PIV 35 AMP
1.60
1.70
1.70
1.80
3,00
100111035 AMP
150 P1V 35 AMP
200 PIV 35 AMP
400 PIV 35 AMP
$1.95
1.95
.50
1.95
1.95
4/1.00
4/1.00
4/1.00
3/1,00
8/1,00
4/1.00
4/1.00
4/1.00
4/1.00
4/1.00
4/1.00
5/1.00
4/1,00
4/1,00
4/1.00
243904
243905
2113906
244013
244123
P41249
1414250
2144400
244401
244402
2N4403
244409
245066
245037
255088
245089
245129
4/120
5/1.00
5/1,00
5/1.00
5/1.00
5/1.00
3/1.00
3/1.00
1415134
1445138
2145139
2N5210
24549
245951
CORNER
ä5
.05
0499
.04
.035
.05
.04
.035
06
.06
.12
.05
.05
.09
.04
,24
.075
1.
.70
.09
.13
.10
.14
.15
.20
.12
.12
.18
.17
.15
10/160
.21
.19
.18
.20
10256
25
100/166
100/250
100/50V
220/16V
470/250
.20
.30
.28
.41
.29
.50
.62
.38
27
.15
.55
.35
.33
.49
.75
-75
.?31k+-
.08
.13
,17
22
.26
.21
.31
.27
.23
.28
.45
35
58
59
.60
.50
6 ELECTROLYTE CAPACITORS
.16
470254
190250
1.7/250
- - .15
22025V
220/506
47ß5V
17/50V
28
le
.13
.11
.047mí
.21
,17
.07
lml
.27
,23
.07
.22m1
33
.27
41094 DINED TANTALUMS 4EOL10) CAPACITORS
28
23
.17
1.5/356
30
12
.14
,15
.15
.16
.17
.24
.19
25
.24
.35
.32
45
22/50V
29
1e
12
.0479E
.19F
RUM CAPACIT088
.022m1
.12
MRIMTURE 419911
22/256
12/1.00
12/1.00
12/1.00
10/1.00
10/1.00
10/1.00
6/1.00
15/1.00
12/1.00
12XL.
.05
.05
10/506
,75
1.15
1.47
28
FW BRIDGE ROC.
TRANSISTORS
100 pf
1.0/506
3.3/50V
1
200m
50
1W BRIDGE BEC.
.00195
00179F
1/35V
15/35V
22/35V
33/350
47/35V
68/350
1.0/354
1
AMP
AMP
AMP
AMP
SCR
.03
03
10/256
1355 SHOREWAY ROAD, BELMONT, CA 94002
803 PIV
1114007
.04
p
p
4.7256
PHONE
ORDERS
WELCOME
(415) 592-8097
144006
.05
22
47
47/50V
- Send 416 stamp
1
CAPACITOR
1,75
-
600 PIV
2N3903
50 PCS
1.75
S9.95 ea.
I
6/1,00
6/1.00
5/1.00
12/1.00
30
2/1.00
0022
0047mó
01m1
50 PCS
.50
MJE2955
263053
P142907 Plastic
001m1
1.75
400 NV
120 (ä 50V
124 0 250V
262925
2112484
2942906
1.75
50 PCS
100 PIV I AMP
203 PIV 1 AMP
144004
1114734
3.60
2.05
SCR AND FW BRIDGE RECTIFIERS
2N22210
2422228
P52222 Plastic
1.75
2.2M
5,68
4011
7m
10m
I AMP
5/1,00
6/1.00
6/1,03
.1.75
1.75
1.75
4/1,00
2/1.00
4/1,00
5/1.00
7/1.00
4/1.00
5/1.00
4/1.00
4/1.00
5/1.00
7/1.00
5/1.00
50 PCS
Postage -Add 5%plusS1 Insurance (if desired)
MAIL ORDER ELECTRONICS
5Wm
/1598
40409
40410
40673
24918
50 PCS
ASST. 8H Includes Resistor Assortments 1-7 (350 PCS.)
610.00 Min. Order U.S. Funds Only
Spas Sheets
256
Calif. Residents Add 6% Sales Tax
1980 Catalog Available
-
75
IK
1506
5
15
25
150
180
50 PIV
242907
.72
ea.
12
5,6
6.2
6.8
7.5
164003
163600
144118
164154
164733
1.25
1.25
3.95
4.95
PRICE
PRICE
4/1.00
4/1.00
4/1.00
4/1.00
4/1.00
4/1,03
4/1.03
4/1.00
4/1.00
1114005
1.50
3.20
2.99
w
840115
1944032
4000
400m
500m
500m
500m
500th
500m
MPSA96
11597
2842369A
841152309
.62
5
82
15
MDA 980-3
57
36 pM SG
10 Pin SG
TYPE
W
120
4,35
3.45
SCR
2112219A
.90
X62240
1.75
5.25
5091241049)
1.15
1,30
SG
092211
X62212
I.64
62
.03
1.00
1.40
1,59
X05136
X54151
X54194
X84202
X64212
054558
X84739
X84741
3.20
4.40
3.85
5.20
350
.90
1.26
1.45
70
R3403
XRI800
052206
X62207
052296
X62209
15A di 400V
28 pin ST 5 .99
139
36 pin ST
1.59
40 pin ST
1.10
1.85
1.75
JE2206KB 19,95
242328
810%980-1
5e
.81
.81
EXAR
400m
400m
400m
400m
400m
400m
400m
7.95/set
X62242011
C36M
59
PM LP
WIRE WRAP SOCKETS
a3
0360
.43
pin SG $
12
1N5245
14456
14458
1N485A
144001
44
28 on
.41
10 OHM
1
1145236
1145242
.60
.83
1/4 WATT RESISTOR ASSORTMENTS
ASST.
50-100
SOLDERTAIL STANDARD (GOLD)
(SOLO) LEVEL
3.3
5.1
5.6
6.2
6.8
9.0
14757
14759
14959
14965
145232
145234
145235
3.50
7.50
3.05
6.95
4.50
MC4016(74416)
VOLTE
114754
5,75
2.95
2.95
1-24
5.3
27
41
640140815
14014391
M03022P
140300111
$3.95 each
DIODES
TYPE
14746
14751
14752
14753
010651
MPSA05
22 pin LP
pin LP
.25
45
)(51498
051489
50
1
LOW PROFILE (TIN) SOCKETS
.30
.31
XR1468CN
CLOCK CHIPS
MOTOROLA
665309
54.95 MC110817
$4.95
5.27
38
75
99
.99
99
0956701
051310F
.99
1.50
19,95
19.95
15.00
30 SOLDERTAIL STANDARD (TIN) 40
17
.357
.500
.500
.300
XR567CP
35
69
.800
.600
,800
.600
_34
.52
pin SG
8
1,19
Common Cathode red
4 s 7 5p1. Digit-RHDP
4 a 7 091. Digit-LH P
O.errange character (el)
.27
.49
.603
.110
.250
.357
.803
.28
5.39
18
100F-3496
.21
pin WW
10 pin WW
pm SG
-
SN 76477
SOUND GENERATOR
Generates Complex Sounds
Low Power - Programmable
1
each
58.40
4,40
4.40
1.55
1.50
.39
.99
.99
1.25
1.95
3.8$
1.95
1.95
X11556
99
99
99
99
.89
.99
.99
1.19
1.25
1.49
1,49
1.49
Common Anode (FN0510)
Common Anode -red
Common Anodered
.181111
20
1111124
.24
.29
.32
,43
16
F40507
.29
.35
14
Common Cathode(F4D500)
HDSP-3403
5082-7300
5082-7302
5082-7304
5062-7340
3.75 0148064
1.39 0148865
1.25 DM8887
1.25 0148889
.59 9371 7 seg.
3.50 C.A. LED driver
1
Common Cathode
99
,603
.830
1
F40503
.22
_30
8 pin SG
ply SG
81145725
Common Cathode y
.99
99
1,75
19.95
11,95
Photo -Darlington Opto -Isolator
3.95
Top Octave Freq. Generator
17.50
5Mhz 2 -phase MOS clock driver
3.75
.27" red num. display w/integ. logic chip
10,95
TV Camera Sync, Generator
14,95
444 Digit DPM Logic Block (Special)
3.95
314 OI9it A/D Converter Set
25.00/se
344 Digit A/D Converter
13.95
X6210
X6215
05320
XR-L555
X6555
PRICE
.300
.300
.300
.500
.600
.630
1
Common Anode -red
Common Cathode -red e
Common Cathode -red
Common Cathode-red
Common Cathode
2.49
4.49
Hi -Speed Divide 10/11 Prescaler
XR205
.560
.590
,560
1
13.50
13,50
13,50
Switching Regulator
Single Switching Regulator
Divide 10/11 Presw r
TV CAME CHIP AND CRYSTAL
AV -3-8500-1 and 2.01 MHZ Crystal (Chip 8 Crystal
includes score display, 6 games and select angles, etc.
.560
.560
1
6145359
CALCULATOR
CHIPS/DRIVERS
2.00
1.60
Common Anode.red Common Cathode-red-D.O,
Common CaOude-red x 1
Common Anode -red
Common Cathode -red
Common Anode -red e
Common Cathode -red
Common Anode -red
Common Cathode -red
Common Anode -red
Common Anode -red x
MAN 6750
MAN 6760
MAN 6780
DL701
01704
01707
01728
21741
01746
01747
01749
01750
51330
F4070
F40358
5082-7730
39
M
POLARITY
.99
.99
.99
.99
.560
,560
RCA LINEAR
2,15
2.56
2.48
1.35
1.30
3.25
3.25
.85
MAN 6740
.560
Common Cathode-orange
Common 01045.red-D.O.
0930132
CA20231
CA30357
TYPE
MAN 6730
99
99
99
Quad Low Noise bi -bet Op Amp
491{
DIGIT -,5" CHARACTERS
THREE ENUNCIATORS
2.00" X 1.20'- PACKAGE
INCLUDES CONNECTOR
T1001-Tranunisaive
57.95
71001A -Reflective
0.25
4.95
.25
1.95
1.25
.99
.75
1.25
49
99
49
.99
.99
99
TL074CN
11494014
TL496CP
11090
LITRORIK ISO -UT
PME
295
.99
.99
.99
128 X 9 X 7 ASCII Shifted with Greek
128 X 9 X 7 Math Symbol 6 Pictures
128 X 9 X 7 Alpha Control Char. Gen
Photo Transistor Opto-Isolator
(Same as PACT 2 or 41425)
DISPLAY LEDS
MAN 1
MAN 2
Clock Generator
MCM6571
MCM6574
MCM6575
MC1N33P
.190" dia.
24,95
19.95
7.50
19.95
6.95
Seven Decade Counter
MK50240
D300260N
TIL308
MM5320
MM5330
LD110/111
.185' dia.
4/51
red
CLASS
Oscillator Controller
30
FIELD EFFECT
5/51
4/51
4/$1
7.95
7.95
6.25
MISCELLANEOUS
TIMEX 11001
red
CMOS Precision limer
CMOS LED StopwatdlRmer
101147207
0.4A
Assembled
green
yellow
4.95
14.95
NMOS READ ONLY MEMORIES
Opsnsing Environment: 0.55.C.
8KBS-W
ICM7205
ICM7208
ICM7209
Bus: S-100
18V
+18V
514.95
14.95
ICM CHIPS
ICM7045
Memory Capacity: 814 bytes
Memory Type: 2708 PROM or equivalent
Memory Arxe» Time: 450 nanoseconds
Welt Ststes at 2MHa: none required
Wait Stabs st 4MHa: one per machine cln
Power Requirements:
TELEPHONE/KEYBOARD CHIPS
Push Button Telephone Dialler
Repertory Dialler
CMOS Clock Generator
Keyboard Encoder 88 keys
Keyboard Encoder 16 keys
Keyboard Encoder 16 keys
Keyboard Encoder 20 keys
AYá9100
d
e
.126" 61a.
5/51
4/$1
4/51
yellow
91050
249
1517114
7549204
15
45
2.49
2.49
2.03
LM710N
1.25
1.75
.99
,89
.29
.29
.29
3.95
1,39
1.29
2.95
1.29
1.29
2.25
004518
Co4520
004566
75454124
75491014
.29
.75
.99
14.50
3.50
M014507
MC14562
84014503
CD4508
C04510
C04511
CD4515
500
500
.69
1925
4014506
75451CN
75452014
74LS0OTTL
741047
741551
741051
741555
741573
741071
741575
MC14410
MC14411
MC14419
MC14433
1.30
.39
99
495
.99
2.49
14.95
14,95
14.95
4.95
t
8K
O0ae
XC209R
XC209G
00209Y
.065" dia.
23
C04093
004098
MC14409
4/$1
4/61
.170" dia.
.55
.23
.49
.89
74085
74090
74093
71095
740107
004070
C04071
C04072
C04028
5/51
4/$1
red
.69
.69
.69
69
1.95
1.95
$4743684
red
green
X0220
M0100
2.25
3.95
3.95
5674284N
S4742894
S474365N
547436661
5474367N
a
LIQUID CRYSTAL DISPLAY
yellow
clear
.200` dla.
XC22R
XC22Y
99
.79
58474283N
r
.200" die.
TYPE
004000
004016
004017
004018
547/1454
o
DISCRETE LEDS
69
.89
.89
54745200
54742515
S4742794
p
Cromemco's BK BYTESAVER84 card provides
a built-in programmer for the popular 2708
PROM and has the capacity fora full 8K bytes of
PROM memory storage. The BYTESAVER® II
also offers a number of new features including
convenient switch selection of board address
and
Cromemoo's powerful memory bank
selection. The BYTESAVER® II is assembled
and tested (Model 8KBS-W) for 3245.
79
54741934
r
0e-"114e11CCOE
1.95
.79
1.95
1.95
9.95
3.95
1.25
1.25
.79
.79
.89
547419084
S14741916
S11711924
0474396
&rlaryliI
.
1,25
89
.79
.79
.79
1.95
0474186N
54741884
o
lh
6.00
547118584
5474384
54744111
.89
.89
1.95
.89
.89
.89
1.25
1.95
1.59
514741665
5474374
0474/04
a Cromemco
TTL
S474704
5571724
5674736
0674744
9671754
1i5
ad
Le
13
.16
14
.15
13
.16
.16
14
10
.11
10
.11
4.7/161/
.15
.14
.13
,11
.10
4.7/250
.15
47/506
.13
,10
,16
,14
.14
.12
.11
.15
.16
24
.13
.14
.21
.10
,12
.19
.24
.35
.23
.15
.20
.30
.17
.28
15/50
47/500
.31
.09
.19
.11
.18
28
.16
Convenient versatile tool for quickly
checking continuity of dead circuits,
switches, appliances, cords, fuses,
motors, control equipment, coils
and panel boards. Also tests circuits for lowresistance shorts and
helps identify wires in multi -wire
cables. Dozens of other uses. Plus
the added convenience of a handy,
durable flashlight. Uses two AA size
penlight batteries (not furnished).
Insulated clip prevents accidental
shorting to case. Alligator clip has
48" lead with plug.
RT300
=M=
$7.95
CONTINENTAL SPECIALTIES
8080A/8060A SUPPORT DEVICES
8080A
8212
8214
8216
6224
8226
8228
8238
8251
8253
8255
8257
8259
3.25
5.95
3.49
B -Bit Input/Output
Priority Interrupt Control
Bi-Dlredionel Ens Omer
MC6810API
MC6821
Pappe. Inter. Adapt (MC6820)
769
MC6828
MC6830L8
MC6550
006852
Monty Interrupt Controller
1024X8 51 ROM (5)08030-e)
12.95
14.95
7.95
9.95
MODEM
device. It has a typical input impedance of
100K ohms end weighs a
mere 3 oz. 185 grams). It has
an input volt. range of 4V to 15V
and draws a max. of 100mA@1 OV
MM52309
2400 bps Mudubtor
Oued 3 -State Bus. Trans. (MC8126)
25801
1020%1
2101(8101)
2102
21102
2111(8111)
2112
2111
2114L
2114-3
256X1
102401
Static
Static
1024X1
Static
256X1
Static
Static
Static
Static
Static
Static
Proto Clips
14-PIN CLIP
16-PIN CLIP
24 -PIN CLIP
40 -PIN CLIP
CPU
CPU
CDP1802
2650
6502
CPU
19.95
MPU
19.95
CPU
11.95
8035
P8085
TMS9900JL
8
514.95
16,95
1024%4
102104
102104
0205/2107
256X4
4096%1
7189
745205
93421
UPO414
256%1
256%1
19.95
....
...
....
..
PC -14
PC -16
PC -24
PC -40
-
.
-
MM5016H
2504T
2518
2522
2524
IRK
1024X4
16,364X1
14.95
9.95
MM5262
211X1
State
Dynamic 350ns
(house marked)
Dynamic
Rio
7415670
4%4
Jumbo 6 -Digit Clock
TMS2532
2708
2716 T.I
IM
2.95
2.95
4.00
4.00
2-95
6.95
2.49
Slate
Register Hie (Treater)
$ 4.75
$10.00
$16.00
V.51013
5.95
30K BAUD
8K
16th"
"Requires
10 95
29.95
EPROM
3
-5V.
voltages,
a5V, +125
a.
2048
6301-1(7611) 1024
FAMOS
6330-1(76021 256
32%8
82523
4096
825115
32X8
825123
74186
512
74188
256
1024
745287
Open C Bipolar
Open Collector
Bipoer
Trisule
TTL Open Collector
TTL Open Collector
44.95
55.95
99.95
155.00
131.00
THERMOMETER KIT
KitMI
with standard /6 pm
IC connector
Ony .5VDC recurred for operations
KEYBOARD
FULL 8 BIT LATCHED OUTPUT
Dual sensors-switching control for in
door/outdoor or dual monitoring
Continuous LED .8" ht. display
to 100°C
-40°F t199Fí° / -40C
Rage:
n
Sat for Fahrenheit or Celsius reading
incl.
wall
adapter
Sim. walnut ease - AC
Size) 3.1/4"H x 6-5/8"W x 1-3/8"O
-19
The JE600 Encoder Keyboard provides two separate hexadecimal
digits produced Iron sequential key enures to allow direct Pug'
ramming for 8 51 microprocessor or 8 bit memory nrcuils. Three
13) additional keysare pronged er user oaraions wile one laving
a bstable output avallaSle The outputs are latched and monitored
wan LEO Ieadouts Also Include is a key entry strobe
$59.95
Hexadecimal Keypad only
Size:
614" x
3-1/8"
x 134"
buffered
-define keys
2Fully
custom applications
Caps lock
Color
R-JW-B
R-JW-W
Blue
R-JW-Y
R-JW-R
Price
50
50
50
ft. roll
ft. roll
ft. roil
Red
50
ft. roll
AP- Unwrap Tool
JUST tJ
provided
for upper
,anges end
struction. 1K" jaws, VA"
travel. Can be permanently
Installed.
ADJUSTABLE WRENCH
Two Sizes: 6"
and 10"
Professional Duality
Chrome Vanadium Steel
6"- AW-6..
$79.95
JE61O
62 -Key Keyboard
only..$34.95
Pupped e
., a..-aee.b.,....,-,
.rw ,
<I
$6.95
7
7.50
7.50
14.95
35.00
14.95
r
PADDED CARRYING CASE
x10 DC PROBE ADAPTER din to IOK)
4OkV OC PROBE
10 AMP DC Current Shunt
-
25d
Spec Sheets
$10.00 Min. Order U.S. Funds Only
1980 Catalog Available
Calif. ResidentsAdd 6% Sales Tax
Postage -Add 5%plus $1 Inarance (if desired)
ameco
ELECTRONICS
MAIL ORDER ELECTRONICS
Ievº
$74.95
115V AC ADAPTER
-
.
b7
Digital Multimeter
VP -10
VP -40
C5.1
10"- AW-10..
JOYSTICK
VIDEO CONTROLLER
-og, I.
'APT..
CC3
$4.95
ar I-
I_I
RC -3
$3.49
VV -1
for
Easy interfacing with a 16 -pin dip
or 18 -pin edge connector
'1117.1.1:
.,.,..aa,
$3.49
Vacuum -tined light -duty
vise for small components
and aaaemblles. ABS con-
TTL/DTL or MOS logic arrays
,x,,4.oI
tf.. r
.e, .m
2.98
2.98
2.98
Vacuum Vise
only
case
$2.98
r
1X303 Portable LCD Digital Multimeter
19
14.95
Utilizes a 2376 140 pin) encoder
read only memory chip
Outputs directly cornpatible with
connector, electronic components and a
double -sided printed wiring board. The
keyboard assembly requires +5V @ 150mA
and -12V @ 10mA for operation.
mËCI.
Awe
$14.95
14.95
14.95
Bed
White
Yellow
alpha characters
The JE610 62 -Key ASCII Encoded Keyboard
Kit can be interfaced into most any computer system. The JE610 Kit comes complete with an industrial grade keyboard
switch assembly 162 keys), IC's, sockets,
sink,,,
-
$12.95
Yellow
Set
Uses LM309K. Heat
provided. PC board construction. Provides a solid
1
amp @ 5 volts. Can supply up
to :5V, :9V and :12V with
JE205 Adapter. Includes components, hardware and instructions.
Size: 3%" x 5" x 2"H
DC/DC converter with +5V input. Toriodal hi speed switching XMFR, Short circuit protection.
PC board construction. Piggy -back to JE 200
board. Size: 3%" x 2" x 9/16"H
JW-1-y
JW-1-R
60 Keys generate the full 128 characters, upper and lower case ASCII
6 -Digit Clock Kit $19.95 HICKOK
Regulated Power Supply
ADAPTER BOARD
-Adapts to JE200±5V, ±9V and ±12V
Blue
White
FEATURES:
cath-
MM5314 clock chip
minutes
SUses
for
dº
itches
hold ohours,
and
Hrs. easily viewable to 20 ft.
Si mutated wetnut case
115 VAC operation
12 or 24 hr. operation
Incl. all components, case &
wall transformer
Cotir
JW-1-B
JW-1-W
62 -Key ASCII Encoded Keyboard Kit
$29.95
ode display
Put Na.
$39.95
JE300
$14.95
user
BBright .300 ht comm.
Part No.
JUST UIRAP" Replacement Wire
keys
LED readout to verily entries
314 x iRe
e
-
WOO output tar n¢ra.
JE600
square posts
swim
User Dehne keys with one being DI
stable operation
Debounce orcuit pronged for all 19
noncom
.025"
Built-in cut off
Includes 50 ft. wire
Point -to-Point
No stripping or slitting required
just wrap
3
Easy
WRAP
1w
AWG wire
Daisy chain or
2 95
Static
r¡¡((Colo
30
processor use
Four .630"ht. and two .300"ht.
common anode displays
o Uses MM5314 clock chip
+Switches for hours, minutes and hold functions
Hours easily viewable to 30 feet
Simulated walnut case
115 VAC operation
12 or 24 hour operation
Includes all components, case and wall transformer
JE747
l
3.49
2.95
3.95
19.95
3.95
9.95
3.95
Tnsble Bipolar
DIGITAL
JE600 HEXADECIMAL
ENCODER KIT
FEATURES:
Full 8 bit
89.95
E
5203
dbm
$75.00
TRS-16K
V power supply
ROM
EPROM
405X8
-6
Expand your 4K TRS-80 System to 16K.
Kit comes complete with:
8 each UPD416-1 (16K Dynamic Rams) 250NS
Documentation for conversion
49 95
EPROM
inn single
from
dbm
TRS-80
05.95
59.95
EPROM
/6K'
TMS2516
dbm nominal. Adjustable
-2o
16K Conversion Kit
4/1.00
FAMOS
2048
16K'
27161NTEL
3.95
4.95
2.95
Dual 250 Static
Dual 240 Bit Static
Quad 00 Bit
17020
-15
Frequency reference automatically adjusts to
allow Ill. 000/0101 bemoan 1800 Hz and 2400 Hz
Digital Data Interlace
EIA RS -232C or 20 mA current loop (receiver is
opoiselated and inn -polar).
120 VAC, single phase, 10 Walls.
Power Requirements
All components mount an a single 5 by 9"
Physical
printed circuit board. MI components included
Reueres a VOM. Audio Oscillator. Frequency Counter and/or Oscilbstope to align
95
TMS4045
2117
1270 mark: High = 025 space, 2225 mark.
-46 dbm Mcoustnaly caupled-
Receive Frequency Tolerance
PROM'S
89
512 Static
1024 Dynamic
Dual 256 8i1 Static
3341
A
$ 4.50
.
Slats
9
2025 Hz for space: 2225 Hz for mark.
Switch selectape Low (normal) = 1070 space.
to
7.95
4.95
1.75
4.95
2.95
4.95
11.95
Receive Channel Frequencies
Receive Sensitivity
Transmit Level
11.5
Stec
Asynchronous Serial (return to mark level reputed
between each character).
95
7
300 Baud.
Data rennet
Transmit Channel Frequencies
10.95
10.95
4K
cams
19.95
22.95
26.95
.
.50
.50
.50
50
1024 Dynamic
Hex 32 en Static
Dual 132 Bit Static
$17.95
PB -6
PB -100
PB -101
PB -102
PB -103
PB -104
PB -203
PB -203A
PB -203A -Kit
811
Maximum Data Rah
45141
650
Dual 100 Bit Static
Dual 64 Bd Aasmulator
450ns
450ns low power
30015
300ns mw power
Dynamo 16 pin 25015
IRK
7554044-
49.95
500/512 Bit Dynamic
Dual 16
MOS
Dynamic
Static
Static Trams
Static
Dynamic 16 pin
4K
selectable).
.9a
3.95
1.75
1.95
3.95
4.95
(864027)
1995
Dual 25 Bit Dynam
Dual 50 Bh Dynamic
1e
Stabs
16%4
UPI
(MK4116)
16 -Bit MPU w/hardware. multiply
MM500H
MM503H
MM504H
MM506H
MM510H
Proto Boards
JE205
256%1
1021%1
5701
2.25
CPU
critical speed requirements for the recorder and it is able to communicate directy with
another modern and terminal for telephone "hamming' and 0Ammunrcabons. In
addition, il lslree of orieral adjustments and Isbuihwith ion -precision, madly available
pans
Frequency-SOih Keying, lull -duplex (half -duplex
Data Transmission Method
5149
Dynamic
Kit Only
The Pennywblstle 103 is capable of recording data to and from audio lape without
995
10.95
Static
1101
1103
21141-3
14.95
-Bit MPU w/dock. RAM, 1/0 lines
$139.95
59.95
RANI
280(780C)
Z80A(780-1)
2525
2527
2526
2529
2532
$70.00
LM -1
JE701
User Manual
SHIFT REGISTERS
any DTL, HTL.
TTL, or CMOS
x
Charader Genemorlupper case)
Charader Generatar(lowar case)
Character Generator
2046-&t Read Only Memory
-MICROPROCESSOR CNIPS--1111SCeuANE6US-
The Logic Monitor allows you to
check logic levels
on all 16 pins of
611
2513(2110)
12.95
a made
Size:
User Manual
514.95
21.95
5.95
Asynchronous Comm. Adapter
Synchronous Sant Data Adapt.
MC6880A
M-COPI802
M-2650
2513(3021)
2516
5.95
7.95
14.95
9.95
19.95
19.95
Prop. Internet Control
0-600 Dps Dgild
User
ROM'S
3.49
4.95
0800500 SUPPORT DEVICES
MPU
MPU with Clack and Ram
12868 Static Ram
57.50
7,50
5.00
Marys
M-280
395
Clock Generator/Driver
Bus Driver
System Conlrolw/Bus Driver
System Controller
Frog. Comm. 1/0 (USAR7)
Prog. Interval Timer
Peg. Pariah. 1!0 (PPI)
Prop. DMA Coring
MC6800
MC6802CP
"Pennywhistle 103"
MICROPROCESSOR MANUALS
5 1.95
CPU
MC6860
MC6862
Logic Monitor
The Incredible
MICROPROCESSOR COMPONENTS
Continuity Tester and Flashlight
- Send 41d stamp
PHONE
ORDERS
WELCOME
(415) 592.8097
- WORLDWIDE
CA 94002
1355 SHOREWAY ROAD, BELMONT,
ADVERTISED PRICES GOOD THRU MARCH
CIRCLE 27 ON FREE INFORMATION CARD
www.americanradiohistory.com
fROHTVIEW
IDEAL FOR ALL VIDEO GAMES OR REMOTE CON;
TROL PROJECTS
SMALL CASE SIZE: 1-1/2"H x 2-3/8"w x 4'5/16"L
2 MINIATURE POTENTIOMETERS -40K OHM EACH
SPST PUSH BUTTON CONTROL
CONNECTION CABLE
RUGGED PLASTIC CASE
5 -WIRE
JVC-40
-5
FEET LONG
$4.95eachhi
87
INTERNATIONAL ELECTRONICS UNLIMITED
10/$1.00
JUMBO RED LED
.20" diffused
25/82.00
SUBMIN RED LED
,125" diffused
$1.19ea
10/87.95
25/$17.50
100/$65.00
.4" ORANGE overflow ±1
MAN4630 - common anode
$.89ea
10/$5.95
7/51.00
RED LED DISPLAY
7 segment RHD
XAN72(MAN72 equiv)
cannon anode
25/$2.85
SUBMIN GREEN LED
.125" diffused
400mo
15/$1.00 100/$5.00
rectifier
12/$1.00 100/$7.00
rectifier
10/81.00 100/$9.00
FILM CAPACITORS - 100Y
PK-10 PK-100
POLYESTER
%
.3"
10%
EA.
PK-10
PK-100
.95
6.50
.0330 5.20
.047uf
.068uf
.15
.15
.15
.15
.15
.15
.95
.95
.95
.95
.95
.95
7.50
7.50
7.50
7.50
7.50
7.50
7.50
7.50
1.00
1.15
1.30
1.75
2.25
2.55
2.75
3.50
1040
.95
.95
EA.
.00330
.0047uf
.0068uf
.01uf
.015uf
.022uf
CERAMIC
1pf
5pf
7pf
lOpf
1pf Total
DISC CAPACITORS
EA.
PK-10
1.00
.85
EA.
6.50
6.00
.25
.25
pLl
12hr
9.00
8.00
AD
-¡Lli.',.
-sx-:
4
22
4024 4025 -
27
4027 4028
4s
4012 4012 -
12
40b 4035 -
-
018
-
4019
4020
-
4á1] -
4069
22
4071
1
J9
1046 -
1
74009
95
74010
s
14
22
4053 -
ncn
c74
4066
74c83
74cm
- 1ió
w
740173
74C174
96
1.76
-
1.00
1.25
30
1.20
1.20
1.30
740175 74C192
-
1b
74.0174.902 740211 4C193
..
In
53021070 45
2314 Wen -
2.20
4351n -
4n
If
271818049M1.4048
1»
$1,00
119n
-
2102.11440.9,
641-
1
8703C
10
/3»
144
4 STATIC
4 879286 -
2
-
-
raC74
715. 784 C8484884. en 10.73
65.46.321 212 SYNC GEN
7»
09126 -
7
76
73
nt
3114
740
21.78914139614531-
ends
sm
eel
-8
CRYSTALS $3.45..
2.000 MHz 6.104 MHz
4.000 MHz 8.000 MHz
3.67 MHz
10.000 MHz
5.000 MHz 20.000 MHz
6.000 MHz
F
RIBBON CABLE
LAT COLOR CODED(
#30 WIRE
40 tond. - .75/per loot
50 tond. -.90/per foot
ILICON SOLAR CELLS
4" diatnet.r .4V at 1 AMP
LED READOUTS.
s.95 HP3405.8"
4 .85
1
1
Meg, $.75
........6/$1.00
.......
PRV
100
200
400
600
600
1000
lA
3A
12A
50A
06
07
09
14
.20
25
.35
.40
.65
.90
11
0
15
.35
45
20
CC
3
70
1.30
4
1.50
6 50
90
2.00
8 50
100
1050
2.50
1.25
3.00
12.50
1024 stage analog
.50
12.50
16.50
20.00
SAD 1024 a erlgade anlft register.
.1or.0Tuf25Vc-
I
R 232
CONNECTORS
"Bucket
$9.95
I
51.50,
$1.95
$1.95
........$1.60
309K
723
3201
1.a,,55100/1
$2.95
$3.50
$1.50
REGULATORS
340K-12,15
323K-5V3A, .$5.75
5.75
5.1./
DB 25P male
O6 255 remale.
HOODS
$.50
-
5,12,or15V
or24V.-..$1.50
340T-5,6,8,12
15, 18 or 24V$ 1.30
79MG 51.35.76
.
Tern, FOB C:nnbr,dge, Mass
Send Check or Money Order
Include Postage, MInlmum
Telephone, C.O.D Purchase
Older or Charge $20.00.
l..l,n,ml nn Mail Order $5.00.
Send 25! for our catalog featuring
Transistors and Rectll,ers
145 Hampshire Sr., Cambridge, Mass.
.
.
IC SERIES
7400
.17
7401
17
7402
7402
7404
7406
:.
7450
7472
7473
7474
7476
.17
/407
406
7406
7410
17
74111
7411
7412
7413
7414
.22
.22
.42
7415
7417
7420
7426
.33
37
.17
35
33
36
7427
7430
7432
7437
7438
7440
17
85
180
66
Alm
.76
MM6387AA
M7001
SI
Si
1010 G 10 WATTS
1020 G 20 WATTS.
1050 G 50 WATTS
8
-
I8 PIN .25
$ 6.75
$12.95
$25.90
TANTULUM CAPACITORS
.22UF 35V 5/$1.00
.47UF 35V5($1.00
.68UF 35V5/$1.00
tUF 35V 5/$1.00
2.2UF 20V 5/$1.00
3.3UF 20V 4/$1.00
4.7UF 16V 5/$1.00
45
68UF15V
06
55
1.60
.76
76
LM
1.20
.79
.79
.85
565
ae
.76
74325
75491
2.26
75.2
1.05
711 CH
741 C
3/31.0r
$.40 ea.
05.95
7.60
CLOCK CHIPS
MM5316
.
4136-.95
LF355 -1.75
SINGLE
SCR S
SWITCHES
..
$ 1.05
$
OFF
OFF
SOLID STATE SALES
P.O. BOX 74D
SOMERVILLE, MASS. 02143 TEL. (6171 547-7053
CIRCLE 30 ON FREE INFORMATION CARD
V
791
75
NO. 30 WIRE WRAP WIRE
STRAND
100' $1.40
ALCO MINIATURE TOGGLE
MTA 106 SPOT
MTA 206 DPDT
MTA 208 P-DPDT CENTER
NASD 206 P.DPOT CENTER
LEVER SWITCH
U3IS
-.75
-- ---LM386 -.80
LM387 - 1.25
LM1808 - 1.75
1889 - 1.95
CA3080 - .95
LM537 - 2.50
LM553 - 2.50
LM555 -.49
LM556 -,B5
560 - 2.00
- .95
566 - 1.10
567 - 1.10
702 - 1.50
703 -,95
709 -.25
710 -.45
- 40
733H--75
or
- .30
747 -.50
LM1310-2.50
1456 - .95
1458 - .50
3900 - .85
8038CC - 3.90
- 1.95
110
headers
5.50
LM301/748 -25
LM307
.30
LM308
.75
LM311 -.75
LM31B-1.20
LM324
,95
LM339
1.10
LM358
.70
LM377
1.60
LM380
.95
LM382
1.25
1..
743.
75
35V 4/61.00
10V
$.25
25V
$.40
35V 3/$1.00
6V
5/$1.00
15V
$.70
15V
$.95
6.8UF
10UF
22UF
15UF
30UF
1000F
150UF
.75
.75
74122
74193
74194
74166
74126
74197
74219
110
110
ER AMPS
PO
1.30
r.90
61
.35
35
PIN .17 24 PIN .35
14 PIN .20 28 PIN .40
16 PIN .22 40 PIN .60
eo
74181
pin headers
In
EN AUDI
S
SI
2.20
3.30
4.40
DIP SOCKETS
LM201
>44.
74153
eo
16
74172
74174
14110
74176
74177
7.3
17
27
7442
7445
7447
7440
74166
74170
76
42
7492
7494
7426
7498
74127
74121
74122
74123
126
74125
74145
74148
1.30
600IIIZL7ID
tao
74182
74163
74184
.45
45
7491
FennPR
100
200
400
.75
1
42
7420
.27
.27
7441
74156
74157
74180
17
.36
.36
7480
483
7486
7485
.27
744
125A
Full Wave Bridges
TRANSISTOR SPECIALS
2N6233-NPN SWITCHING POWER 51.95
MRF-8004 a CB RF Transistor NPN $ .75
2N3772 NPN Si TO -3
$1.00
2N4908 PNP Si TO.3
$1.00
2N5086 PNP Si TO 92
4 $1.00
2N3137 NPN Si RF
$ .55
2N3919 NPN Si TO.3 RF
$1.50
2N1420 NPN Si 10.5
3/$1.00
2N3767 NPN Si TO -66
$ .70
2N2222 NPN Si TO -18
5 51.00
2N3065 NPN Si 10.3
$ .60
2N3904 NPN Si TO -92
6/$1.00
2N3906 PNP Si TO -92
8/$1.00
2N5296 NPN Si TO -220
$ .50
2N6109 PNP Si TO -220
$ .55
2N3638 PNP Si TO -5
5/51.00
MPSA 13 NPN Si
4/51.00
2N546 PNP GERM TO -3
$ .95
TTL
$ 45
$ .45
.45
4- $1 00
65
2N2646 .UJT
ER 900 TRIGGER DIODES
2N 6028 PROG UJT
FP 100 PHOTO TRANS
0.60
RED, YELLOW, GREEN
LARGE LED's. 2"
RED/GREEN BIPOLAR LED's .2" ..,95
TIL-118 OPTO -ISOLATOR
S .75
MCT43 OPTO ISOLATOR
5 .80
1 WATT ZENERS: 3.3,
4.7, 5.1, 5.6, 9.1,
10, 12, 15, 18, or 22V
641.00
$10.00
FCS 8024 4dlgn
DL-707C.A..3"
C.C. 8" display
05.95 DL 747 C
6"
FND 603 C.C. 5" S .85 HP3400.8" CA
C
MHz counter AC
or OC Input. -5129.00
100
I
32-2102-1 fully buffered, 16 .ddr.. On.. on
board decoding for any 4 of64 pages, standard
44 On bu., may be used with F-8 d KIM
OL 704-.3"
Continental Spe8141BIes
100KHz
62001 1Hz
Generator,
Function
sine, square & triangle
output.- $159.00.
"
UNIVERSAL 4K48 MEMORY BOARD KI
FND 510 c.A. s"
-
.' MAX
100 Freq.
counter. An 8 digit
Silicon Power Rectifiers
-
DAC-088C
bit DA
8" DISKETTES HARD SECTOR
$1.75, 10/518.00
-
z 6" DOUBLE SIDED EPDXY
BOARD 1/16" thick
6.60 ea
5/$2.60
EPDXY glass vector boa d
1/16" thick with 1/10" spacing
51.95
100, 2K, 5K, 10K. 20K,
7858.020 8819 90
0089E91
4"
each 3
00
2N 3820 P FET
2N 5457 N FET
064.131 -
94.11$
viewer, portable, new with
choice of one lens...close up,
telephoto or gen. purpose.
Requires 6 volt DC btry. $250
PRINTER CENTRONICS # 101
Visually OK, with head.
Sold as is
$600.00
Shipping extra on all merchandise
IR
CIRCLE 33 ON FREE INFORMATION CARD
I
0»
n1824006C00111006.65
SEE IN THE
DARKNESS
Meshna Inc., PO Box 62, E. Lynn, Mass. 01904
7 WATT LD 65 LASER DIODE I R $8.95
25 watt Infra Red Pulse
SG 2006 equiv.
Leser Diode (Spec sheet included/
$24.95
MINIATURE MULTI TURN TRIM POTS
4153
In
AN/PRC-6
95642
1.90
30
9óI
- SPST 5V 20ma
1949
270400910014049-
RAY 14611881
20
-
nn»ATICM18104-
n AA VAT
74C183
74C165
27
27
>D
.tás2
4
00
I
45
$25 ea 2 for $45
PRINTED CIRCUIT BOARD
-
95
4518
10
-
MWT9onATE0924926155num69046.6-
4083
iz
-
4M
TTL REED RELAY
21012 364
21112 »0
21111880
25/15/5$3.3.00
00
Broadway
Jackson
Ca
phone 209 223 3870
225
740151
97
40x5 -
.4.143WW801.90.1.84441»,673980.-
21602-1
"T0-92
INTERNATIONAL ELECTRONICS UNLIMITED
74086
20
35
4093 -
45
m
10/81.50
PNP
ON FREE INFORMATION CARD
5
-
4081
225
45
05
.90
NPN TO -92
293906
Total Qty. Each pk-10 pk-25 pk-100
1-999
$25 1.75 2.25 7.50
1000.25
1.50 2.10 7.25
100/075.00
4áw274500
74002
rots - 100
4016
75
80
-
.o
20
293904
METAL FILM RESISTORS . 1% RN60
50 PPM 1/4w std. decade values
10 ohm - 475K, 1M ohm 1/8w only
C/4OSID100E CLAMPEDI
-
pin DIP
Payment by check, M.O., UPS -COD, M/C
Add $1.00 shipping/handling
or VISA.
in US, Canada 8 Mexico.
Other countries
$1.00 + 5% of order.
California residents
add sales tax. Minimum order $10.00
51.15ea
10/510.00
_
CIRCLE
010
$.99ea.
10/58.55
100/880.00
TOME DECODER
CARBON FILM RESISTORS
i
5% 1/4w or 1/2w
1
ohm - 5.6M ohm 5.6M ohm - 15M ohm 1/2w only
Total Qty. Each pk-10 pk-100 pk-1000
1-1000
$.10 .45
3.00
1000.10
.40
2.50 20.00
QUAD PROGRAIRIABLE OP AMP $1.75
10/$15.00
XR4202
16 pin DIP
100/5125.00
BREADBOARD
Govt surplus walky
talky, used cond.
47-55.4 me range.
Ant. $5 each extra.
With data.
5.65ea.
10/55.50
100/947.50
DIP
*
CLOCK CHIP M453859
$1.65ea
4 digit
50/60hz 12hr 10/$12.50
100/8100.00
alarm 40 pin
4009
pin
1.00
PK-100
1.25
1.10
$.69ea
10/$5.90
100/$47.50
LM311 8 pin DIP
10'
RHD
TRANSISTORS
.luf
.015uí
.022uf
PK-10
$1.95
10/$17.50
100/$150.00
(VOLTAGE COMPARATOR
iii+`1a
TIMER
555 8
.030uf
.050uf
,Olaf
10/835.00 100/8275.00
$3.95ea
4-6 digit 60hz
alarm
24 pin
IC
segment
567 8
.0047uf
.003uf
PK-100
CLOCK CHIP MM5375AA
,
12.00
13.50
14.00
20.00
25.00
30.00
-15%
820pf
.001uf
.0015uf
270pf
390pf
470pf
600pf
LOGIC power supplies, unused, solid state construction.
5 Volt 4 amp $35 5 Volt 15 amp $45 5 Volt 25 amp $45
5 volt 35 amp $50 12 Volt 15 amp $40
$.89ea.
10/$7.75
25/517.00
100/562.00
DISPLAY
RED LED
7
FN0500 Common Cathode
,1uí
5.20
.20
1602B
'SARI
5000 pc s.
5"
10.50
- 50V
120pf
159pf
180pf
220pf
22pf 56pf
27pf 69pf
33pf 82pf
47pf 100pf
.050uf
1-1000
1000-
.15uf
.22uf
.33uf
.47uf
pcs. -10%,
QTY. 1000
TOTAL
.20
.25
.30
.35
.40
.45
.50
.1uf
$.79ea
RED LED DISPLAY
7 segment RHD
10/$6.95
NSN74R common cathode 25/$16.25
100/$59.00
$.15
.0015uf .15
.0022uf .15
.001uí
Electricity from the sun.
1/4 amp $50 2.5 Volt panel '/z amp $40
GIANT 31/2 inch cell, delivers 1 amp $8.50
Above cell with special motor & prop, runs in sun $10.25
5 Volt panel
$.99ea
10/$7.95
25/$17.50
100/$65.00
.311
r
100/$9.75
DI
194148
184001
194007
OleC
04111
.000000/M
100/$7.50
JUMBO GREEN LED
.20" diffused
11
4" ORANGE LED DISPLAY
7 segment RHD
MAN4610 - common anode
041194640 - 0040004 cathode
$
S
1
70
1.86
1.85
PRY
100
200
IA
26A
1.5A
2.10
3.10
1.20
.45
.80
400 1.30
800 200
4.30
WE SHIP OVER 95%
OF OUR ORDERS THE
DAY WE RECEIVE THEM
70
80
1.40
L1.90
I 2.60
Y.U. box 44JUt Jaula warn,
NEW PRODUCTS!
Super Color S-100 Video Kit $99.95
Elf II Adapter Kit $24.50
Same day shipment. First line parts only.
Factory tested. Guaranteed money back.
Quality IC's and other components at factory prices.
Expandable to 256 x 192 high resolution color
graphics. 6847 with all display modes computer
controlled. Memory mapped. 1K RAM expandable to 6K. S-100 bus 1802, 8080, 8085, Z80 etc.
Plugs into Elf II providing Super Elf 44 and 50 pin
bus plus S-100 bus expansion (With Super Ex-
Gremlin Color Video Kit $59.95
1802 16K Dynamic RAM Kit $149.00
7400TTL
74000
1802/S-100 expandable to 32K, Hidden refresh
w/clocks up to 4 MHz wino wait states Addl. 16K
RAM $79.00.
74028
18
7404N
7409N
.19
32 x 16 alpha/numerics and graphics; up to 8
colors with 6847 chip; 1K RAM at E000. Plugs
into Super Elf 44 pin bus. Not expandable to high
resolution Graphics.
Quest Super Basic
Quest, the leader in inexpensive 1802 systems
announces another first. Quest is the first company worldwide to ship a full size Basic for 1802
systems. A complete function Super Basle by
Ron Cenker including floating point capability
..17E"),
with scientific notation (number range
32 bit integer ±2 billion; Multi dim arrays; String
arrays; String manipulation; Cassette I/O, Save
and load, Basic, Data and machine language programs; and over 75 Statements, Functions and
Operators.
Easily adaptable on most 1802 systems. Requires 12K RAM minimum for Basic and user
High
andsmod e LED's optional $18.00.
lays, state
programs. Cassette version ii stock now. ROM
versions coming soon with exchange privilege
allowing some credit for cassette version.
$40.00
Super Basic on Cassette
Tom Pittman's 1802 Tiny Basic Source listing
now available. Find out how Tom Pittman wrote
Tiny Basic and how to get the most out of it.
$19.00
Never offered before.
$ 9.95
S-100 4 -Slot Expansion
Super Monitor VI .1 Source Listing
$15.00
Coming Soon: Assembler, (Editor, Oisassembler, DA/AD, Super Sound/Music, EPROM programmer.
rum,
1.25
004022
1.10
L93204.15 1.50
1.60
193204-5
CD4023
CD4024
'B
1.60
1.50
C04025
CD/026
CD4027
004028
C04029
14843204.8
6103204-12
23
.18
74108
74148
7420N
74220
74309
193207.15 1.60
70
t8
LM324N
1.15
39
20
15133911
1.55
1443406-5
1.35
7442N
7445M
11470
7448N
50
09
60
88
7450N
14718
14758
.16
74859
74859
C04021
595
04320012 1.50
10432305
1.35
1M3406.8
193406-12 1.35
L91340015 1.35
LM3401(.24
7495N
35.
34
LM3M11N
69
90
7410041
74107N
74121N
74123)
45
741458
14950N
74151N
74151N
74151N
74161H
69
741620
741630
741908
741931
7419311
71221N
7/2959
LM7Ó H
LM799H
LM723WN
95.
.69
1.00
.89
.87
87
LM733N
1147410X
1174114
LM741X/N
LM746N
LM1303N
LM1704
87.
96.
90
66
66
66
741100
35
35
35
35
7405028
7413048
7415058
741509M
270
275
L941310
2.00
1.65
TEL
741.50014
41
LM1458
LM1800
LM1812
LM1189
LM2111
LM2902
6M39009
LM3905
1.939099
1.15
1.50
7.00
1.15
1.50
.80
1.15
81
.50
3 75
Mc14589
NESIOH
1.00
35
7415139
35
55
74151/0
1.10
N665Á
7465200
35
0E566V
3541
94485700
19
)15555V7415109
9403366
711.53nN
35
78105
7419338
75
55
78106
1.25
1.00
75108
7410748
74157594
70
741.59511
keyboard includes 16 HEX keys
plus load, reset, run, wait, input, memory pro test, monitor select and single step. Large, on
board displays provide output and optional high
and low address. There is a 44 pin standard
connector slot for PC cards and a 50 pin connector slot for the Quest Super Expansion Board.
Power supply and sockets for all IC's are in cluded in the price plus a detailed 127 pg. instrucbon manual which now includes over 40 pgs. of
software info. 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 research and development.
Remember, other computers only offer Super Elf
features at additional cost or not at all. Compare
before you buy. Super Elf Kit $106.95, High
address option $8.95, Low address option
$9.95. Custom Cabinet with drilled and labelled
plexiglass front panel $24.95. Expansion Cabinet
with room for 4 S-100 boards $41.00. NiCad
Battery Memory Saver Kit $6.95. All kits and
options also completely assembled and tested.
video graphics chip allows you to
connect to your own TV with an inexpensive video
modulator to do graphics and games. There is a
speaker system included for writing your own
music or using many music programs already
written. The speaker amplifier may also be used
to drive relays for control purposes.
An RCA 1861
Ouestdata, a 12 page monthly software publica for 1802 computer users is available by sub scnption for $12.00 per year.
Tiny Basic Cassette $10.00, on ROM $38.00,
original Elf kit board 514.95. 1802 software;
Moews Video Graphics $3.50. Games and Music
$3.00, Chip 8 Interpreter $5.50.
hoes
Super Expansion Board with Cassette Interface $89.95
This is truly an astounding value! This board has
been designed to allow you to decide how you
want it optioned. The Super Expansion Board
comes with 4K of low power RAM fully addressable anywhere in 64K with built-in memory protect and a cassette interlace. Provisions have
been made for all other options on the same
board and it fits neatly into the hardwood cabinet
alongside the Super Elf. The board includes slots
for up to 6K of EPROM (2708, 2758, 2716 or TI
2716) and is fully socketed. EPROM can be used
for the monitor and Tiny Basic or other purposes.
Super ROM Monitor $19.95 is available as
an on board option in 2708 EPROM which has
been preprogrammed with a program loader/
editor and error checking multi file cassette
A 1K
read/write software, (relocatible cassette file)
another exclusive from Quest. It includes register
readout, block move capability and
video graphics driver with blinking cursor. Break
points can be used with the register save feature
to isolate program bugs quickly, then follow with
single step. The Super Monitor is written with
save and
subroutines allowing users to take advantage of
monitor functions simply by calling them up.
Improvements and revisions are easily done with
the monitor. If you have the Super Expansion
Board and Super Monitor the monitor is up and
running at the push of a button.
Other on board options include Parallel Input
and Output Ports with full handshake. They
allow easy connection of an ASCII keyboard to the
input port. RS 232 and 20 ma Current Loop for
teletype or other device are on board and if you
need more memory there are two S-100 slots for
static RAM or video boards. Also a 1K Super
Monitor version 2 with video driver for full capa bility display with hoy Basic and avideo interlace
board. Parallel I/O Ports $8.85, RS 232 $4.50,
TTY 20 ma I/F $1.95, S-100 $4.50. A 50 pin
connector set with ribbon cable is available at
$15.50 for easy connectio'7 between the Super
EH and the Super Expansion Board.
Power Supply Kit for the complete system (see
Multi -volt Power Supply ).
45
A
741511214
80368
741.513241
45
35
.89
74151369
45
741.515114
85
85
74L5155N
711.61570
.65
CD40B2
CD4118
CD4490
024507
c04508
C04510
704511
004515
C04518
C04510
C04520
704527
M D
004523
004553
704586
704583
004515
0040192
.25
45
40
.2B
74004
74010
74714
74C20
74(48
74093
747154
740160
740175
740192
870071
B701CN
875072
LD130
9100CJv/F
7415163N 1.15
741.5174N 1.00
CMOS
/
50
13 95
21.00
13.95
9.95
7
74151900 1.06
7034001 Fan 50
7/152210 1.95
C04000
7415367N 1.35
C2/002
CO4008
C04091
004008
LINEAR
.90
10
1.60
CA3081
190
CA3082
2.95
CA3089
LM301A11/4H.35
.87
10430511
.35
61430711
.89
1.1430841
1.50
1513098
LM311X/N .90
10
1
g
G4Y385061
995
9.95
3.50
1060
416
16.00
5
1
15
40
3
00
1
44
1
35
165
75
1.95
695
55
65
8091
8098
65
65
8,09
25
814
8425
CD4013
.28
.28
.39
8428
8797
8798
704014
004015
1;00
828
1.50
3.00
5.50
110
3.50
3.20
19
2.7
5
1.69
1.69
NOS/MEMORY
CD4016
C04017
C04018
105.45
2R11F01.1
.94
21021
1013174/1(
375
CD4019
111318
1
35
CD4020
.45
1:02
2101AL-4
2102ÁM-21
3.95
95
1.25
1.60
66432005 1.50
7.95
5.80
8
28
36
.25
40
.00
board lot
53
bled70.00 Enclosure 14.95
F079 assemASCII
/95
175
8
pn ww
Jd
19.75
2.90
8.00
CONTINENTAL SPECIALTIES In she
Complete Me of breadboard lest equip
MA01001 digit Free- CII. 5125.95
Portable Mulllmeler
1.00
18
57
40
1.23
450
4 MHz
50
4.25
MHz
425
10 MHz
18 MHz
4.25
3.90
20 MHz
32 MHz
3.90
3.90
32788 MHz
1.8432 MHz
3.5795 MHz
2.0100 MHz
2.097152 MHz
1C0
MHz
1
4.50
1.20
1.95
4.50
4.50
1.50
450
4.50
4.50
5.7143 MHz
6.5536 MHz
14.31818 MHz
18432 MHz
22.1184 MHz
4.50
1.25
1.50
050
53
828251
17.95
5.50
5.50
6.95
8255
9 25
8257
19.50
8259
1802CP
Pies
18020P
plea.
1861P
CDPI802CO
00/418020
COP1861
6820
6850
6502
6504
6522
19 50
A1á2376
4Yá3600
90016áS
R5232 complele SM 8.50
OE95
1.95
DA15P
04155
3.10
BIMmb3NMSOLEO
1250
IXm00r
16.50
13.60
SloewalN
AeM
M1
CIM MI
81.w
SO.w
17.81
7uoninT08a
850
261893
2M222Á
2M2369
7.50
6.95
40
.27
.30
.20
.25
2429048
21429074
3.95
70 5p
29.50
2X3053
243833
30KMM9
MI
Freeeenq
Creamier
547.75
TRANSFORMERS
RANSF
300 ORMERS6
12 Volt 300 me tranelurmer
3.25
1.25
3.75
126V CT600ma
2.96
126 250 ma wall plug
12V CT 250 ma wall plug
3.50
3 95
4.85
10V
2 a0mpmwall plug
12V 6
12V 500 ma wall plug
1
141S
amp
ll
3 amp wall plug
500
1
1212V
8.5ug
DISPLAY LEOS
CA .270 2.90
125
CC
1.25
75.00
65.00
60 00
2.95
69
.25
75
284401
20
284402
60
TIP31
TIP33A
1
CCtCA.5001.35
FN0603510
FN01002D7
CClCA
OI
77108
.S00
.90
800.
2.20
-10
.80
Bu5ble
I dpll Bupble
DGB Fluorescent
0510 Fluorescent
5 digit 14 pin display
NSN69 9 digit display
7520 018r.0 photocells
3
11
1
75
175
I.00
.80
.39
9.50
X
30
1.10
40
40
40
1.20
1.20
.95
1.20
CO
CC 40
1.95
CC .56
1.35
CA .80
1.35
CC .fi0
a e5
2X4400
67559
CA/CC .600 1.95
CC .600 1.05
70.
CC .357
FND5007507
CC
85.00
8748
8]48-8
01747/750
01750
iNDJSB
MAN1719
MAN4740
M6N6610
MAM6770
81119
115.00
.38
LNCA.3001.D0
C Á .300 170
21707/217079
CNCC 500 1.90
01727/72/
NAN/610
18
.18
Complete IC data selector, 2500 pg. master reference guide. Over 50,000 cross references. Free
update service through 1979. Domestic postage
$3.50. No foreign orders
12395
2.5 MNa Freµaney Counter
.25
25
95
283914
4800
2M3908
79 IC Update Master Manual $35.00
981.05
Clod Wender MI
CC
CA
2X3908
$4.40
5369.00
M4N1640
81404610
22.50
Converts digital clocks from AC line frequency
to crystal time base. Outstanding accuracy.
00
9229
Sinclair 315 01911
MUIIImeter
/0
2758
Will erase 25 PROMS in 15 minutes. Ultra$37.50
violet. assembled
5224.0E
01.704
17.95
11.50
19.95
25.00
12.95
9.95
12.95
PROM
PROM Eraser
10.50
125- LED 9splay
Per17,enlee 100* Le44e
Mulder KII
Model 10 Inyyger
Expander Kit
Model 150 Bus
Grabber Kit
MAMI
0 CORheNun 8823!
'MAN3
2.95 MAM72/74
0825P
13 95
me
Operates 5-18 Volt OC to 5
typ.
a
512.50
740922
710923
W 9880010
$10 00, $1.50 shipping.
27
695
s1100165.5
Unlemeal
Counter bard KII
Encoder
8.50
15.00
$37.45, $4.00 shipping. Woodgrain case
00
7
Push5un0n
Switches Mom
81
24
28
RE170AR0 ENCODERS
Multi -volt Computer Power Supply
9.oard
MPC
PIN
2.90
5.35
8v 5 amp, ±18v .5 amp, 5v 1.5 amp, -5v
.5 amp, 12v .5 amp, -12 option. ±5v, s12v
are regulated. Kit $29.95. Kit with punched frame
118.00
SPECIAL 194000025
5865 Stopwatch %mer
290
882523
mod
OK WIRE WRAP TOOLS In
5]
1224
8228
271541
2716 Intel
2732
clew
Y een11jYMlow.51.25
r
8216
2708
.25
O Moulins
Mille 0.0
58
32
33
7.2768 MHz
3 0688 MHz
5.185 MHz
95
2806
17029
20
20
Green. Ores ge, Yellow Jumbo
42
A
.15
Green. Yellow 1016
WRAP LEBEL 3
24578 MHz
17.50
14 75
AV5-1013
4V5-1014
3341
167.50
77.50
LEDO
Red 1018
35
16
5
28085
80
male bus. Board plus 3
CIRCLE 14 ON FREE INFORMATION CARD
76
.27
20
2
7.50
2.50
connectors $22.95.
AIM 65/KIMNIM I/O Expansion Kit; 4 parallel
and 2 serial ports plus 2 internal timers $39.00.
PROM programmer for 2716 $150.00.
on charge cards.
16
18
1099
15.95
94M53101
with power supply $485.00. Molded plastic
enclosure to fit AIM 65 plus power supply $47.50.
AIM 65/KIMNIM/Super Elf 44 pin expansion
60 Hz Crystal Time Base Kit
224
CRYSTALS
95
3.75
6502 based single board with full ASCII keyboard
and 20 column thermal printer. 20 char. alphanumeric display, ROM monitor, fully expandable. $375.00. 4K version $450.00. 4K Assembler $85.00, 8K Basic Interpreter $100.00.
Special small power supply for AIM 65 assem. in
frame $49.00. Complete AIM 65 in thin briefcase
1
290
3 01411
3.901307
0500267N
9520567N
ROCKWELL AIM 65 Computer
board; 3 female and
1445
1.7'7910
8212
8214
INTFRFACf
..26
28
14
4
2700
4
7
1
14
24414
390
210
CP001
BOBOA
23
95
5.50
6.95
6.95
.45
45
695
078165716
9368
4100
6802
2B
5pertype675
KEYBOARDS
56 key ASCO keyboard Mt
Fully assembled
IC SOCKETS
Sa40er no Law PMNIt
%N
/ UP PIN 1UP
MICROPROCESSOR
7 50
6800
2.10
12
r type
1350 2ece pad
025
015
N wan 5% per type 05
CONNECTORS
edge.
30
º.75
pm
4.50
100 Vin edge
100 Mn edge WW 5.25
3.00
5.50
7
C04012
<.50
740023
74C925
74C926
740927
1.10
CD4009
C04010
CD4011
225
type
100 per type
290
8223
ppeer
3.75
3.75
3.75
8.75
8.75
.40
1.50
7201
7209
7209
.19
7/0922
8713
8720
048577
MM5375AG/N 4.90
16.50
7205
3.50
500
8750
0825126
N925129
0825131
8825136
9825137
3.00
9.95
5.91
1.00
5.00
13.95
9.95
2.90
1.50
44915841
10145865
I.51
200
y8
3.75
3.75
3.95
7.40
7.90
10.95
6.30
4100165.5
MM57100
MIASMA
94
7/0905
.216
6
25
096
WIRE
PIN
40
9.50
14.25
125
91002825253
MM14
2.52
1.10
1.02
1.02
747221
747906
CONVERTER 740914
RESISTORS 1. wan 5%
1.1828
2B
5,50
1,00
4.25
1.02
74C00
TERMS: $5.00 min. order U.S. Funds. Calif residents add 6% tax.
BankAmericard and Master Charge accepted.
Shipping charges will be added
42003
.28
1
004081
74C76
71090
60
60
85
75
50
55
89
1
74151626 1.15
1
P01110-3
P04110-1
P51011
142
CD4078
00
5 00
1CL7103
101.7107
CA3045
cA3016
10815330
13
1
/0
40
50
28
28
74774
75494741741.6930
10
1
25138
MM52 62
1405280
1425320
85
CD4068
CD4069
C04070
c04071
CD4073
L94073
C04075
C04076
150
78405
7415107N
74151130
02
15
71
74C30
75C
5191H
85
7741.590119
A 24 key HEX
i
C014066
.85
1.00
1
741528M
7415389
21141-3
1116
1.02
L/41307MM53759AM
87
.85
743650
713664
]1367N
.35
1.75
1.10
1.27
15
I
40
.28
.50
.67
.35
.32
.75
211411
45
.19
7.50
1.15
3.00
5.00
1.00
1.60
1.60
59.
741259
2112-2
1.02
CD4050
C04051
C04060
193407-24
14938
85
2111-1
1.25
43
LM343H
LM350
LM370
LM377
LM379
21078-4
45
1.25
1.25
4.50
43
43
68
167
1
21044-4E0
10044-4
2.00
004049
1403404.18
7490N
14928
C04040
C04042
112
C04043
004041
C04046
7.85
49
68
c04030
C04035
ELECTRONICS
211021
25
35
I 25
7417541
Compare features before you decide to buy any
other computer. There is no other computer on
the market today that has all the desirable benefits of the Super EH for so little money. The Super
Elf is a small single board computer that does
many big things. It is an excellent computer for
training and for learning programming with its
machine language and yet it is easily expanded
with additional memory, Full Basic, ASCII
Keyboards, video character generation, etc.
Before you buy another small computer, see 'd it
includes the following features: ROM monitor;
State and Mode displays; Single step; Optional
address displays; Power Supply; Audio Amplifier
and Speaker; Fully socketed for all IC's; Real cost
of in warranty repairs; Full documentation.
The Super Elf includes a ROM monitor for program loading, editing and execution with SINGLE
STEP for program debugging which is not included in others at the same price. With SINGLE
STEP you can see the microprocessor chip operating with the unique Ouest address and data bus
displays before, during and after executing instructions. Also, CPU mode and instruction cycle
are decoded and displayed on 8 LED indicators.
UW'
.
1.25
1
1643401-5
LM3401-1
LM3401.12
LM3401.15
35
741750
RCA Cosmac Super Elf Computer $106.95
2322 Walsh Ave.
INTEGRATED CIRCUITS
17
9 DUD 4
1.F1
will call only: (408) 988-1640
For
00
ÿ
NM740
0010120
02P3 transformer
8
95
2.25
Not a Cheap Clock Kit $14.95
Includes everything except case. 2 -PC boards.
6- 50" LED Displays. 5314 clock chip, transformer, all components and full instructions.
Orange displays also avail. Same kit w/.80"
displays. Red only $21.95. Case $11.75
NiCad Battery Fixer/Charger Kit
Opens shorted cells that won't hold a charge
and then charges them up, all in one kit w/full
$7.25
parts and instructions
S-100 Computer Boards
$135.00
265.00
423.00
475.00
32K Static RAM Kit
199.00
16K Dynamic RAM Klt
310.00
32K Dynamic RAM Kit
470.00
Kit
RAM
64K Dynamic
$89.00
8K116K Eprom Kit (less PROMS)
$129.00
Video Interface Kit
Extender Board $8.99
Motherboard $39.
8K Static RAM Kit
16K Static RAM Kit
24K Static RAM Kit
$8.95
Video Modulator Kit
Convert your TV set into a high quality monitor
without affecting normal usage. Complete kit
with full instructions.
Digital Temp. Meter Kit
$34.00
Indoor and outdoor. Switches back and forth.
Beautiful. 50" LED readouts. Nothing like it
available. Needs no additional parts for complete, full operation. Will measure -100° to
+200°F, tenths of a degree, air or liquid
$11.75
Beautiful woodorain cese w/bezel
FREE: Sand tor your copy of our NEW 1979
OUEST BATALOG. Include 286 stamp.
FREE
SEND FOR
Power Supplies
12 volts @ 13 amps
CATALOG
THIS MONTH'S SPECIALS
"GIVE ME ONE GOOD REASON
WHY
SURPLUS UNITS IN LIKE NEW CONDITION
COMPUTER GRADES
FACTORY FRESH
of
of
@
5 VDC
4 6 VDC
of © 7 VDC
of © 6 VDC
175
S
profits seem
to fly away before you
can put them in your
pocket?
4
REMOTE SENSING, REMOTE VOLTAGE ADJUSTMENT,
OVERLOAD PROTECTION and OVERVOLTAGE PROTECTION
35
S
ALSO AVAILABLE IN
S750
ROTRON 3 BLADE
.is" Long Shall
v." Dia
25 For 15.00 4
used but fully tested
4-5/8
x
4-5/8
5
SEIN
Knobs for Slidel
Pots 20s well
Cat. Ns. 1161
D.P.D.T. PRINTED
CIRCUIT MINI TOGGLE
C -H
758 Each
m0 112.90
ho
6 amp. e 125 vac
$945
FAN
3.1/2 inch long
The only air moving
device that fits inside a
134" rack panel mounted
instrument. High performance and low noise
2.3/4 inch sloe
POTTER BRUMFIELD
4 PDT RELAYS
REED RELAYS
level.
Cat. Ne.
9.15 VOLT D.C. LATCH
y/
fi
WANT 9 MORE GOOD REASONS
TO JOIN NESDA?
2. Industry information
3. ServiceShop magazine
4. Electronics Service
Industry Yearbook
5. Advocate for better
warranty practices
6. Group -rate insurance
7. Technical information
8. Management information
9. Legislative programs with
state and nat'I. govt$.
10. Low BankCard rates
LARGE QUANTITIES AVAILABLE
11.35 each 10 for 112.50
5
ROTRON BISCUIT"
the money you take in.
11111.111.11.1.1.
50K AUDIO SLIDE POTS
x 11/2"
your NESDA membership
TIN SOLDERTAIL .156"x .200"
14 pen
3 amp
NORMALLY OPENED
CONTACTS: 1 amp max.
switch
amp max. carry
BODY SIZE: approx. 1 Inch
long V. Inch high
-2
1510
style
_
cont.cte
'
(>.
24 volt d.c. or
120 volt a.c. coil
Ossa but lulls tested
{{`
11.25aach
1IIrJJJ
specify con voltage
S.P.S.T. 1500 ohm coil
11.15 each
TENNS: Add Postage
MINIMUM MEN: $10.00
LARGE QUANTITIES AVAILABLE
LINEAR SLIDE POTS
D.P.S.T. 1200 ohm coil
11.30 each
Mastercharge and Visa accepted.
»pro Z
1
1
3/13
Don't let your bucks get
inch Ong
get lost in the shuffle
inch slide
10h or 20h
At NESDA, the bottom
line is putting more
$$$ in your pocket.
11.50 each
P.O. Box 2361R
Woburn, MA 01888
TEK -EL Corp.
ALL ELECTROAICS
W
Store
27 GILL ST. WOBURN. MA 01801
6 Warehouse open 9-5 Sat 9-1
Tel 617-935-7328
CIRCLE
31 ON FREE
7474
.35
74181
74393
1.55
1.85
741,003
.24
74LS08
.32
.35
.30
74LS09
74í.S20
74LS27
74LS122
.30
.50
.95
74LS175
74LS367
74LS 386
.
75
.80
1.95
741,5 39 3
74505
74551
$G3083
C2416
52431
45
video 100
12" BLACK & WHITE
LOW COST VIDEO
MONITOR
$139
1024 X 8 EPRM
$745
SOROC
IQ 120
$74900
RESISTOR NETWORKS
values
1I
rte`
OHMS
1.50 8 ION
EPROM ERASER
UP TO 6 EPROMS IN 19
6000 HOUR BULB LIFE
ON
) .89EA
100/491
BY
.28
.75
.58
1.25
3.99
1.99
w/sine
'599'
NI
eai,
95
265
LOGIC
51795
$199 741.5240
8216
Bus DRIVER
PROBE
l"
1
AMP
5795
t
16K EPROM
$2795
74LS24
74LS244 4011111
450 ns single+5V
TL HIT. INT,SGS
74LS373
74LS374 S-100 16K ADD-ON
s245
150`
s2 9á
I
N
STOCK
MH0026CJ
74S373
DUAL CLOCK
DRIVER $ 100
74S374
325
'
BARE BOARD
WITH DOCUMENTATION AND
DETAILED INSTRUCTION BOOK.
182895
K-
2114L
1024x4 Static RAM4b
450 ns
J4
aB
CONCORD
SPST
SWITCNES
$195
COMPUTER COMPONENTS
R
VISA-MASTERCHARCE
/
(714) 937-0637
CHECO OR M.O.
NO CAD.
ANAHEIM, CA. 92806
We
stock and sellover12,000t pes of semi -conductors
MINIMUMORDER-510.00
ADD $1.50 FOR FRT.
CAL. RES. ADD 6%
CIRCLE 54 ON FREE INFORMATION CARD
RAM
MEMORY ADD-ON FOR THE
TRS-S0 OR APPLE II to 450n,
I'.
o:
8
for
55995
I.C.
MHSTEZ
1980"
'5995
ULN2001
High -current Drivers.
69C
Darlingtons
ere*
sC;
S-100 MEMORY ADD-ON
**
**
*
**
**
**
1971 SOUTH STATE COLLEGE
16Kx1 Static
16K
STFTIÇ
**
SPECTOUNE
MINUTES4¡95
v
2716
74 LS241
4116
c
Tractor Mechanism
8038C
VCO Waveform Ger
T.I./M.M.I.
3"
270,4.70,8 1511
1.00
base2 inc.
II
SOLAR CEL
D, SOS
2K Terminal Buffer
Fast Paper Feed/Graphics
KIT
2708
450ns AM
1.25
.I
CIRCLE 16 ON FREE INFORMATION CARD
80-COLUMN IMPACT PRINTER
.45
1,03900
Fort Worth, TX 76109
INFORMATION CARD
MISCELLANEOUS CIRUIT SPECIALS
CD4049B
MC14520B
MC14528BCP
NE555
NE556
and your local and
state associations
Send for more information:
NESDA, 2708 W. Berry St.
Min. Order 110.00
Add $2.00
Shipping USA
Calif. Rea. Add 6%
Prompt Shipping
PM
Monday thru Friday
Saturday
10 AM 3PM
ON FREE INFORMATION CARD
.20
.20
JOIN NESDA
TERMS
Quantities Limited
Warehouse Hours
&
SAM.
Store
8
CORP.
905 S. Vermont Ave. SEND FOR OUR FREE CATALOG
Los Angeles. CA 90006
(2131 380-8000
NEW RETAIL STORE
CIRCLE
504 each SPECIFY VALUE
3.P.S.T. 750 ohm coil
40'
it
T
can help you keep more of
22144 EDGEBOARD CONNECTOR
For $1.00
///
¡ ,YID_
What you get from
VDC ®25 AMPS $79.00 per unit
10 MEG POTS
.Standard 'G Wall Son
i
COOLING FANS
-jl
12
79.** per
unit
P
eight hour period
SI00
Fp
because your
-IE-
RIPPLE: 2mV RMS max., 20 mV
P -P max.
STABILITY: Typically 10mV for
5200
SHOULD JOIN NESDA?"
Haven't you felt frustrated
5.
Input change
330,000
150,000
63,000
7,000
I
Reason No.1: PROFIT
INPUT: 115 vac 43.63hz
OUTPUT: 12 vdc 0.13 amps
REGULATION: 0.1% + mV
NI
-FL, ± 0.1% ± 5mV for 10%
FULLY STATIC OPERATION
USES 2114 TYPE STATIC RAMSMS
+8 VDC INPUT AT LESS THAN 2 AMPS
BANK SELECT AVAILABLE BY BANK PORT AND
BANK BYTE
PHANTOM LINE CAPABILITY
ADDRESSABLE IN 4K BLOCKS IN 4K
INCREMENTS
LED INDICATORS FOR BOARD/BANK
SOLDER MASK ON BOTH SIDES OF BOARD
ASSEMBLED
&TESTED
$ 26900
California Computer Systems
Radio Shack -Your No. 1 Parts Place
Low Prices and New Items Every Day!
Low -Power Schottky ICs
Low
As
Semiconductor
Applications
Handbook
49e
NEW
No -Strip Wire Wrapping
Tool & Replacement Wire
1295
199
100% Prime
Guaranteed Specs
Improved 5 -volt logic devices use
Schottky diode technology for
minimum propagation delay and
high speed at minimum power.
Type
74LS00
74LS02
74LSO4
74LS08
74LS10
74LS13
74LS20
74LS27
74LS30
74LS32
74LS47
74LS51
74LS73
74LS74
74LS75
74LS76
74LS85
74LS90
74LS92
74LS93
74LS123
74LS132
74LS151
74LS157
74LS161
74LS164
74LS175
74LS192
74LS193
74LS194
74LS196
74LS367
74LS368
74LS373
74LS374
Cat. No.
ONLY
276-1900
276-1902
276-1904
276-1908
276-1910
276-1911
276-1912
276-1913
276-1914
276-1915
276-1916
276-1917
276-1918
276-1919
276-1920
276-1921
276-1922
276-1923
276-1924
276-1925
276-1926
276-1927
276-1929
276-1930
276-1931
276-1932
276-1934
276-1935
276-1936
276-1937
276-1938
276-1835
276-1836
276-1943
276-1944
.49
.59
.59
.49
.59
.99
.59
.69
.59
.69
1.29
.59
.69
.69
.99
.79
1.29
.99
.99
.99
1.19
.99
.99
Engineer's Notebook
of IC Circuits
Become your own design engineer! Handy reference gives applications and circuit examples for
most popular linear and digital ICs. Basic building
block circuits for digital logic includes truth tables
and helpful tips. All circuits have been built and
1 99
tested. 128 pages. 276-5001
1.49
1.19
1.49
Sale
276-155
2 -Voltage. 1368 holes. For digital circuits.
Sale
276-156
3 -Voltage. 1368 holes. For OP amps.
Sale
276-157
E 22 -Pin Dual Edge -Card Socket. Wire wrapping.
276-1550
4000 -Series CMOS ICs
EACH
Cat. No.
4012
4013
4017
4020
4021
4023
4027
4028
4046
4511
4049
4050
4051
4066
4070
4518
4543
.69
.69
.79
.99
3.99
3.99
3.99
3 49
A
11111
14 -Pin Wrapping Sockets.
276-1993
©
©
16 -Pin
Wrapping Sockets.
276-1996
Pkg. 2/1.39
1995
24-Hour Alarm
.79
1.49
1.39
.79
1.49
1.99
Selectable Time/Temp Display
Large Bright 0.7" LED's
Remote Temperature Sensing
r
2A95
Complete 12/24 hour -clock features temperature display in degrees C or F. Beeping 24 -hour alarm drives an 8-ohm speaker
24.95
directly. 50-60 Hz operation. 277-1006
4 99
Power Transformer. 273-1530
299
CMOS chip replaces over 8 separate ICs in
a digital display circuit. Input pulse shaping.
Master reset pin. 16 -pin DIP.
2.99
276-2498
249
2102 1024 x 1 Array. Low-cost static memory chip.
16 -pin DIP. Buy 8 and save!
2.49 Ea. or 8/14.95
276-2501
2114L 1024 x 4 Array. NMOS static RAM. t8 -pin
10.99
DIP. 276-2504
Complete clock module -just add switches and battery! 0.25"
LCD display has built-in backlight, alarm set, PM and snooze indicators. Piezo buzzer 273-064 is ideal for alarm. Operates up to
13 seconds per
a year on single 1.5V battery. Accuracy:
19 95
month. 277-1005
Miniature Piezo Buzzer Element
Penetrating 6.5 kHz electronic tone. Can be driven by external
1 99
signal or self -oscillating circuit. 273-064
Dual Analog Delay IC
4"
109$
1295
Continuously Variable
Many Audio
Applications
-
SAD1024A. "Bucket Brigade" device has 2 separate 512-stage
shift registers which can be used independently or in combination. Provides continuously variable electronic delay for complex
audio signals to create reverb, echo, phase shift, chorus and vibrato effects. Reliable NMOS design operates from single supply. With applications circuits and data. 16 -pin DIP.
10 95
276-1761
WHY WAIT FOR MAIL ORDER DELIVERY?
IN STOCK NOW AT OUR STORE NEAR YOU!
Cooling Fan
Super
Quiet
Operation
Ideal for cooling power supplies, microcomputers, hi-fi
and Ham gear. Delivers up to 70 CFM. Diecast venturi.
U.L. recognized motor. For 120VAC, 60 Hz.
12.95
273-241
ftadueThaeK
FORT WORTH, TEXAS 76102
OVER 7000 LOCATIONS IN 40 COUNTRIES
A DIVISION OF TANDY CORPORATION
at
Actual Size
Shows Time/Day/Date
Specs and Pin Out Diagram
Included with Each Device.
'Retail prices may vary
Pkg. 2/1.29
Clock Module
.69
.99
Low As
129
12/24 -Hr. LCD
1.29
1.89
1.69
.79
RAM Memory ICs
Low
As
A DIP header. Mounts resistors, capacitors, etc., for
1 29
use with 16 -pin DIP sockets. 276-1980
Low -profile. 3 level pin length.
NEW LED Clock Module
1.69
1.69
1.69
All Prime from Major Semiconductor Manufacturers.
MC14553 3 -Digit
BCD Counter IC
B
Epoxy glass. All 41/2x4" with 1/16' grid. Fit 22 -pin dual
edge connector. Reg. 4.99.
1 -Voltage. 1295 holes. For most applications.
1.49
1.59
1.19
1.19
2.39
2.39
DIP Header & Wrapping Sockets
Irr
A
1.49
276-2401
276-2411
276-2412
276-2413
276-2417
276-2420
276-2421
276-2423
276-2427
276-2428
276-2446
276-2447
276-2449
276-2450
276-2451
276-2466
276-2470
276-2490
276-2491
Quick -Wrap Tool:" For 0.025" square posts. No stripping
required. Daisy chain or point-to-point. Cuts wire from spool.
12 95
Easy wire loading. 276-1572
1 99
© Red Kynar Wire. 50: 278-501
1 99
White Kynar Wire. 50: 278-502
1 99
Blue Kynar Wire. 50: 278-503
49
3As
Low
1.49
4001
4011
i
Universal PC Boards
and Connectors
1.19
Type
199
El
individual stores and dealers.
CERCLE 34 ON FREE INFORMATION CARD
www.americanradiohistory.com
100 W CLASS A
POWER AMP KIT
Dynamic Bias Class "A" circuit design makes this
unit unique in its class. Crystal clear, 100 watts
power output will satisfy the most picky fans. A perfect combination with the TA-1020 low T.I.M. stereo pre -amp.
Specifications:
i
MARK IV 15 STEPS
LED POWER LEVEL
INDICATOR KIT
rDIGITAL AUTO
SECURITY SYSTEM
This new stereo level indicator kit consists of 36 4
color LED (15 per channel) to indicate the sound
level output of your amplifier from -36dB w +3dB
Comes with a well -designed silk screen printed plas
tic panel and has a selector switch to allow floating
or gradual output indicating. Power supply is
12V D.C. with THG on board input sensitivity con.
trots. This unit can work with any amplifier from 181
to 200W!
Kit includes 70 pcs. driver transistors, 38 pcs.
matched 4 -color LED, all other electronic compon.
ents, PC board and front panel.
4 DIGITS
PERSONAL CODE!!
SPECIAL $19.95
6
Output power: 100W RMS into 8 -ohm
125W RMS into 4 -ohm
Frequency response: 10Hz - 100 KHz
T.H.D.: less than 0.008%
S/N ratio: better than 80dB
Input sensitivity: IV max.
Power supply: ±40V @ 5 amp
TA -1000 KIT
$51.95
Power
proximity trigger
voltage triggered
mechanically triggered
This alarm protects you and itself! Entering protected area will set it off, sounding your car horn
or siren you add. Any change in voltage will also
trigger the alarm into action. If cables within passenger compartment are cut, the unit protects itself
by sounding the alarm.
3 -WAY PROTECTION!
All units factory assembled and tested
Not a kit'
-
MARK IV KIT $31.50
transformer
515.00 each
A NEW LED ARRAY AND
DRIVER FOR
30W+30W STEREO"
HYBRID AMPLIFIER KIT
PROFESSIONAL
10 OCTAVE STEREO
GRAPHIC EQUALIZER!!
Graphic equalizer have been used for years in sound
studios and concert arenas but were too expensive
to be considered for home use. Now we offer you the
facility at an affordable price. This unit can extend
your control of your Hi-Fi system by minimizing the
non-linearities of the combined speaker/room system. Fantastic features as follows:
10 double slide controls for two channels
Cut out rumble, surface noise and hiss
Minimizes speaker/room non-Iinearities
Frequency response from 30Hz to 16KHz
10 tone controls plus defeat, monitor and tape
selector.
Contra range ± 12dB in 10 octaves (30Hz, 60Hz,
120Hz, 240Hz, 500Hz, 1KHz, 2KHz, 4KHz, 8KHz,
16KHz.)
Operating voltage 117V 50/60Hz.
FACTORY ASSEMBLED UNIT, NOT A KIT
transformer not in-
-
±
MODEL 888
R
FEATURES
Circuitry: designed for operation by high
efficient, high power silicon transistor
which enable illumination maintain in a
standard level even the battery supply
drops to a certain low voltage.
9" 6W cool/daylight miniature fluorescent tube.
8 x 1".5V UM -1 (size D) dry cell battery.
$10.50
STEREO
AMPLIFIER
Steps 4 Colors
LED VU
indicator kit with arc -shape display
panel!!! This Mark Ill LED level indicator is a new
design PC board with an arc -shape 4 colors ,LED display (change color from red, yellow, green and the
peak output indicated by rose). The power range is
very large, from -30dB to +5dB. The Mark Ill indicator is applicable to 1 watt - 200 watts amplifier
operating voltage is 3V - 9V DC at max 400 MA. The
circuit uses 10 LEDs per channel. It is very easy to
connect to the amplifier. Just hook up with the
Stereo level
PROFESSIONAL FM
WIRELESS MICROPHONE
TECT model WEM -16 is
a factory assembled FM wiremicrophone powered by an AA size battery.
Transmits in the range of 88-108MHz with 3 transistor circuits and an omni-directional electric condenser. Element built-in plastic tube type case; mike is
6'4" long. With a standard FM radio, can be heard
anywhere on a one -acre lot; sound quality was
judged very good.
less
m
FLASHER LED
LM 380 with Volume Control
Power Suply 6
18V DC
2
UOOI
ONLY $6.00 EACH
PROFESSIONAL
PANEL METERS
A. 0-50UA
B. 0-30VDC
II
circuit em-
voltage 9V D.C.
Unique design combines a jumbo red LED with an IC
flasher chip in one package. Operates directly from
5V -7V DC. No dropping resistor neded. Pulse rate
3Hz @ 5V 20mA.
2
for 52.20
BIPOLAR LED RED/GREEN
colors in one LED, green and red, changes color
when reverse voltage supply. Amazing!
2 FOR $1.60
2
5W AUDIO AMP KIT
MARK II SOUND
ACTIVATED SWITCH KIT
with the kit. The relay can
handle up to 200 watts contact to allow to control most
things. Just click the finger,
the relay will close, the second click will release it.
Sensitivity can be adjusted by an on board
trim -pot. Operating
-
COMPLETED UNIT
NOT A KIT!
power stereo amp. with bass, middle, treble 3 -way tone control. Fully assembled and
tested, ready to work. Total harmonic distortion less
than 0.5% at full power. Output maximum is 60
watts per channel at 8t2. Power supply is 24 - 36V
AC or DC. Complete unit.
Assembled $49.50 ea.
Power transformer
S 8.50 ea.
OCL pre amp. &
IN KIT FORM $18.50
ployed 2 LC., a DPDT relay
S6.50
56.50
1R 2406G is an I.C. specially designed to drive. 12
LED. The number of LED is lineally illuminated according to the control voltage input terminal 21.
Operating voltage is 9
12V D.C.
$5.35 EACH
$16.50
speaker output!
A new designed
56.50
Man
2.28-
8 KHz
NEW MARK III
S5.50
LED DRIVERS
Easy sliding door for changing batteries.
Stainless reflector with wide angle increasing lamination of the lantern.
EA
3db
Output Impedance: 1K ohm max.
Polar Pattern: Omni -directional
Power Supply: 1.5V
10V D.C.
Sound Pressure Level: Max. 120dB
EM4RP $2.50 ea. or 2 for $4.50
9
LED ARRAY
GL -112R3 Red, Red, Red
GL -112N3 Green, Yellow, Red
GL -112M2 Green, Green, Red
GL -112G3 Green, Green, Green
BATTERY POWERED
FLUORESCENT LANTERN
SPECIAL PRICE $117.00 ea
FEG. Response: 50 Hz
This series covers a wide range of level indication
uses, output and input voltage, time related change,
temperature, light measurement and sound level. The
problem of uneven brilliance often encountered with
LED arrangements as well as design problems caused
by using several units of varying size are substantially reduced. 12 LEDs in one bar
cluded. It produces ultra
hi-fi output up to 60
watts (30 watts per
channel) yet gives out
less than 0.1% total harmonic distortion between
100Mz and 10KHz.
SUB MINI SIZE FET
CONDENSER MICROPHONE
Specification:
Sensitivity:
65dB
LEVEL METERS
It works in 12V DC as well! Kit includes 1 PC SANYO
STK-043 stereo power amp. IC LM 1458 as pre amp.
all other electronic parts, PC Board, all control
pots and special heat
sink for hybrid. Power
Tvoe MU -52E
SPECIE
8.50
8.50
C. 0-50VDC
8.50
D. 0-3ADC
9.00
E. 0-100VDC
9.00
All meters white face with
scales. Plastic cover.
NIC1200 (12 hr) $24.50 EA.
NIC2400 (24 hr) S26.50 EA
ea.
ea.
ea.
ea.
ea.
MINI -SIZED I.C. AM RADIO
Size smaller than a box of matches!
Receives all AM stations.
Batteries and ear phones included.
black
Only $10.50
0.5" LED
12 DC MINI RELAY
ALARM CLOCK MODULE
ASSEMBLED! NOT A KIT!
Features:
real time
LCD CLOCK MODULE!
0.5" LCD 4 digits display
X'tal controlled circuits D.C. powered (1.5V battery) 12 hr. or 24 hr.
display 24 hr. alarm set 60 min. countdown timer
On board dual back-up lights
Dual time zone display Stop watch function.
digits 0.5" LED Displays
12 hours
format
24 hours alarm audio output
4
59 min. countdown timer
10 min. snooze control.
ONLY $7.00 EACH
'
(FREE)
CIRCLE 38 ON FREE INFORMATION CARD
www.americanradiohistory.com
SPDT
SPDT
DPDT
4PDT
2
AMP
3 AMP
2 AMP
3 AMP
1.30
1.60
2.50
3.50
LINEAR SLIDE POT
5002 SINGLE
SPECIAL TRANSFORMER
FOR CLOCK
6V
12V
12V
12V
-
Metal Case 3" Long
2 FOR $1.20
-
PÑIANY SOUND
FLUORESCENT LIGHT
DRIVER KIT
30.
12V DC POWERED
-15
Watt FluoLights up 8
rescent Light Tubes. Ideal
for camper, outdoor, auto or
boat. Kit includes high voltage coil, power transistor,
heat sink, all other electronic parts and PC Board, light
tube not included!
With Case Only
$6.50 Per Kit
- MARK III
This new designed circuit uses high
FEQ. FET transistors with 2 stages
pre amp. Transmits FM Range (88120 MHz) up to 2 blocks away and
with the ultra sensitive condenser
microphone that comes with the kit.
allows you to pick up any sound
within 15 ft. away! Kit includes all
FMC -105
electronic parts. OSC coils, and P.C.
$11.50 PER KIT Board. Power supply 9V D.C.
PRESS -A -LIGHT SELF
GENERATED FLASHLIGHT
speakers.
circuits.
A
AUDIO AMP KIT
Kit includes: STK-015 Hybrid IC, power supply with
power transformer, front Amp with tone control, all
electronic parts as well as PC Board. Less than
0.5% harmonic distortion at full power 1/2dB response from 20-100,000 Hz.
This amplifier has QUASI
Complimentary class B outmax
put.
at 1451, ONLY
wOutput
R MS)
$23.50 each
Overall size 2" x 1.2" 0-5" characters
reflective type.
for clock 4 digits with
Model 737-01
PM, alarm, snooze, colen indicators.
for panel meter 4
Model 739-04
SPST
2 FOR
2.80 SPDT
FOR
2
Model 739-03
digits with
indicator.
AMP
AMP
AMP
AMP
0.8 AMP
0.5 AMP
120 MA
CT
CT
CT
$8.50
$10.50
$10.50
$10.50
$2.50
$2.50
$1.80
AG
EA.
EA.
EA.
EA.
EA.
EA.
EA.
CT AC
DC
DC
$2.75
$2.10
$1.90
$1.90
Resistance: 0.19 to 20 Mt!
current: 0.01 A to 100 MA
OUR PRICE
D.0
built-in audio amplifier provides high level output.
Operates from one 9V battery, 28 pin
dip: we supply the datas $2.90 EACH
ELECTRONIC SWITC
- colors Alligator clips
22" long lead. Ideal for any testing.
4'10
pairs
5
Touch On Touch Off
uses 7473 I.C. and
12V relay
$5.50 each
1
$2.20/pack
WATT AUDIO AMPg
All parts are pre -assembled on a
mini PC Board, Supply Voltage 6
9V D.C. SPECIAL PRICE $1.95 ea.
LOW TIM DC STEREO
PRE-AMP KIT TA-10 20
Incorporates brand-new D.C. design that gives a
100KHz ±0.5dB!
frequency response from 0Hz
Added features like tone defeat and loudness control
frequency
supplies to eliown
let you tailor your
minate power fluctuation!
T.I.M.
T.H.D. less than .005%
Specifications:
-
Size of the module is 1" dia. Ideal for
use in auto panel, computer, instrument
and many others!
$8.95 EACH
less than .005% Frequency response: DC to 100KHz
±0.5dB RIAA deviation: ±0.2dB S/N ratio: betSensitivity: Phono 2MV 47K/Aux.
ter than 70dB
100MV 100K Output level: 1.3V Max. output: 15V
Tone control: bass ±10dB @ 50Hz/treble ±10dB
@ 15Hz Power supply: ±24 D.C. @ 0.5A
Kit comes with regulated power supply, all you need
is a 48V C.T. transformer @ 0.5A.
will turn on relay, buzzer cr
trigger other circuit for 2 - 10 sec.
(adjustable). Ideal for use as door
alarm, sound controlled toys and
many other projects. Supply voltage
4.5V
9V D.C.
2 for $3.00
SCR
ONLY $44.50
X'former
FM WIRELESS MIC KIT
It is not a pack of cigarettes. It is a
new FM wireless mic kit! New de
sign PC board fits into a plastic
cigarette box (case included). Uses
a condenser microphone to allow you
to have a better response in sound
pick-up. Transmits up to 350 ft.!
With an LED Indicator to signal the
unit is on ±FMM2 KIT FORM $7,91
Ile FORMULA
-`1`
on a
KIT
CONDENSER TYPE
well as stop watch function!! Battery
and back up light is with the module,
N/Open Contact
Color: Red, White, Blue, Green, Black
HEAVY DUTY
CLIP LEADS
$27$
per pair
A
LCD Clock Module with month
and date, hour, minute and seconds. As
PUSH-BUTTON SWITCH
506 each
LARGE QTY. AVAILABLE
0-30 Power Supply
$10.50 each
-
EA.
EA.
EA.
EA.
0.3" digits
$71.45
3/51.00
N/Close also Available
f1.5.701-13'
SOUND GENERATOR I.C.
COMPLETE TIME MODULE
$1.75 ea.
; 8'8 B
gun shot, exCreates almost any type of sound
plosion, train, car crash, star war, birds, organ ext.
HICKOK LX303
SOUND ACTIVATED SWITCH
DIGITAL LCD MULTIMETER
All parts completed on a PC Board
19 ranges and
F.S. sensitivity
D.C. volt: 0.1 MV to
functions
1000V A.C. volt: 0.1 V to 600 V
I
I.C. TEST CLIPS
Kit includes the Ultra Sonic Transducers, 2 PC Boards
for transmitter and receiver. All electronic parts and
instructions. Easy to build and a lot of uses such as
remote control for TV, garage door, alarm system or
$15.50
counter. Unit operates by 9-12 DC.
200 hours 9V
31/2 digits display
Auto zero: polarity;
battery life
100MV DC
indication
overrange
--
7aº -o4
Same as the E -Z clips
With 20" Long Leads
In Black and Red Colors
ULTRASONIC
SWITCH KIT
-
31/2
0-30V D.C. REGULA1 D
Uses UA723 and ZN3055 Power
TR output can be adjusted from
0-30V, 2 AMP. Complete with PC
board and all electronic parts.
Transformer for Power Supply,
$8.50
2 AMP 24V x 2
AC POWER SUPPLY
Wall Type Transformer
200 MA
Output
100 MA
Output
120 MA
Output
100 MA
Output
--
POWER SUPPLY KIT
3.20
ALL 117 VOLT INPUT
4
3
3
3
óóóó
_
88.88
meter
- signfor panel
and over range
-
r'e. TRANSFORMERS
CT
CT
CT
±
All displays include zeber connectors
and front bezel. With data sheets.
any model $7.50 EACH
Your choice
6 AMP 125V AC CONTACT
30V
36V
48V
24V
24V
12V
12V
-
digits.
SUB MINIATURE
TOGGLE SWITCH
MAIN AMP (15W x 2)
Uses STK-015 Hybrid Power Amp
BECKMAN FET
LIQUID CRYSTAL DISPLAY
or hookup to your car back-up to
make a reverse indicator. Light
Output up to 130dB. Voltage sup 12V
ply 6
includes 2 pcs. Fisher PA
301 Hybrid IC all electronic parts
with PC Board. Power supply
16V DC (not included). Power
band with (KF 1% -± 3dB). Voltage gain 33dB. 20Hz - 20KHz.
SUPER 15 WATT
LIMITED QUANTITY AVAILABLE
dng
battery
gives out 12.5V D.C. 1.8 amp per
hour. All fresh code, pull-out from
movie cameras. Can be disconnecto use as single c cells. Hard
to find $15.00 per pack of 10 batteries
10 C size ni -cd
$7.50
SPECIAL SALE
4 FOR $3.60
RECHARGEABLE BATTERIES
SIZE BATTERY PACK
in
pack.
Kit
Super Buy
Only $18.50
AA SIZE NI -CD
ELECTRONIC ALARM SIREN
COMPLETE UNIT
Ideal for use as an Alarm Unit
12V
16V
6V
12V
"FISHER" 30 WATT
STEREO AMP
and P.C. board.
,Jed
well as your
must for OCL
KIT FORM
$8.75 EA.
nic parts, filter capacitors, I.C., heat sinks
,.
Cut off when circuit is shorted
or over load to protect your
as
'-4
30V DC 800 MA adjustable, fully regulated
by Fairchild 78MG and 79MG voltage regulator I.C.
Kit includes all electro-
$12.50 PER KIT
ELECTRONIC DUAL
SPEAKER PROTECTOR
amplifier
r VOLTAGE
REGULATED DUAL
SUPPLY KIT
Model EB2116 (Continuous)
Model EB2126 (Slow Pulse)
Model EB2136 (Fast Pulse)
$3.60 EACH
AU -999
Never worry about battery.
because it has none! Easy
to carry in pocket and handy
to use. Ideal for emergency
tight. It generates its own
electricity by squeezing grip
lever. Put one in your car,
boat, camper or home. You
may need it some time!
EXCLUSIVES $3.95 ea
Model F-179
,
"C"
;414,
SUPER FM WIRELESS
MIC KIT
DECISIONS
Solid statesound indicator operating
µA Small size apvoltagee6VV DC
proximately 3/4"x1V4",
SOLID STATE
ELECTRONIC BUZZER
Mini size
/4
r
x 3/4"
$1.50 sac
3 BO
SHIPPING AND HANDLING CHARGES
Du.toue
usas. SS ÇQ Durcnaee o.er 150 purchase
a1
IDA
6p`ñ//
Canada)
2094
s
Ortler fï0.D1/C alil..Rasidanls Adc 1%sae:
MOn.
ten. Set.
Noun
10-]
D./Stºn
NO
C.O,
Orders AceºDted On Vin Or MC ONLY,
CA 10210
12102 CRENSHAW BLVD., HAWTHORNS,
(213) 171-5162
DHONE: (213) 173-1121
IYa
D110na
3
INTERNATIONAL INC.Send S1,OO
tari /niiruudnt Menico
mue
fieMin
1"x
Supply voltage 1.5V -12V
deal for Alarm or Tone Indicator
CIRCLE 39 ON FREE INFORMATION CARD
For petalled
Catalogue
HOBBYWORLD®
CALL TOLL
(1001 84163
RESISTORS, %, 1, & 2 watts. 1%, assorted types, 4363)
60-CERAMIC CAPS, aset'd val. 8 styles, incl; tubular., NO's, etc., 14590) .,
30 -MOLEX CONNECTORS, nylon, aimed styles, colon, &
of cond. (#5835)
4-ROCKER SWITCHES, DPDT. solder eyelet terminals, 43302)
1 -RELAY.
MRCOCK 6VDC, SPST, plastic case 1058071
1-25 AMP @RIDGE RECTIFIER, 50 voile, 100% 45948)
S0 -1N4000 RECTIFIERS, epoxy, axial leads, untested, (x2594)
30pc: HEAT SHRINK, Thermo-fit, useful ass). of sizes, shrinlu 50% 45248)
10 -SLIDE SWITCHES, SPST, SPDT, etc. all shape and sizes, 1158271
25-DTL'., 100% prime, nerd fli flop., etc., marked, (#3709)
10-MAN -3's, 7 segment, w/bubble magnifier, 100% material,
(03842)
4-L-259 COAX PLUG, mates to SO
-239, Amphenol, 105221)
1 -LITE SENSITIVE UNIIUNCTION TRANSISTOR, programmable,
)057191
100 -PRE -FORMED Ye WATTERS, popular values,
son.. 5 & 10 %er, 1010601
4 -PHOTO ELECTRIC DARLINGTON TRANSISTORS,
1x3276)
40-POWEIJIESISTORS, assorted type, include 2 to 10 wailer,, (x320) ..,
15 -NE-2 LAMPS, neon red, for 110VAC, lens resistor,
41435)
30-"CRIMP -ON" TERMINALS, rings and spades,
12-20 wire, 43955) SO -ONE -WATT RESISTORS, popular assts, some 5%en, 100's of uses, (03844)
30 -FT. WIRE -WRAP WIRE, 30 gauge, insulated, conlinuoes length, (03103) -.
6 -SPOT MICRO SLIDE SWITCH, only 3/7" cube, for PC mount, (03429)
10 -PR. -RCA PLUGS & JACKS, for audio, speaker, etc., 4402)
5ßN3055 HORSY TRANSISTORS,
TO -3, 1037711
6 -SINGLE PIN MICRO GREEN LEDS. 3V, 10 mils, "pin heads", 100%, (06126)
61UMRO RED LEDS, 1,5-3 V 0 101nA. 100% material, 100'e ol uses, (02135)
6 -MAGNETIC DISCS, shatter -resistant Plaslelloy, 13/16" die. (#6099)
S -PHOTO CELLS, Vactec 900, disc type
2K ohm (dark) w/leads, (#41351
1-12VDC SPOT RELAY, 180 ohm coU, 2S mA, 101x10" sealed -10593})
10 -VOLUME CONTROLS, asst, value, audio, and switch too! (05921
60-PREFORMED DISC CAPS, handy aseoAmenl of values, marked, (#11011
SO-PRECISION
O
17
D
I7
l
fax
D
G
l:
40 CHANNEL
bee
only
$14.99
CB BOARD
H
¡V
FOR
r
a)i
$1$
/
,
1
n
D
D
In
,
..
1
M
P®
«'
P OLY PAKSO
SO.
P.O. BOX 942. R3
LYNNFIELD, MA 01940
lane..
(215eewa),
We
Please
61
0<
la
la
now To
la
1,29
60 for 1.30
1,29
80 for 1.30
1.29 40 114-1-32
1.29
2
1.30
1.29 20 for 1.30
1.29
4 for 1.30
1.29
2 ta 1,30
1.29 100 for 1.30
1.29 80
1,30
1.29 80 for 1.30
1.29
12 for 1.30
1.29
8 ta 1.30
1,29
2 for 1.30
1.29 20 for 1.30
la
la
i,,$
1,29
20 fer 1.30
12 for 1.30
Oiler 1.30
4 foe 1.30
0 for 1,30
12Ja 1,30
30 I0r 1.30
8 ta 1.30
01112312-
end COO,
o.e.ryM«a« wall. Mlel...«4«a&
,
.fete Cat.
3421Áa.
KO 101 tones).
aortae. RA
kl
_a dweriPOan,
0150có,
area
l!_CrMlee; eel f&
teems
stile,
a
:
ra
'94
01 40
894
e
S1.610
99.0
l It.
nod
10 H.
5.60
02.10
02.40
ii6190
65.10
$9.00
40
S12.00
51.60
s2s.w
SI5.00
monk el
Me
PerRMS;
reter)M. TERMS: nee
Met -w- Phone 96171 245.3Á2h
150
75
.75
1.60
750,1
250
150
150
200
1.10
.90
.90
1.10
h
,1
1
6)4
Cat.
LIat
IM
54.00
SAW
4
o,
STYLE
family. perfect for
100, of switching appliulirms!
248190411906
Cat No.'119 NPN
Cal Nn. 140 PNP
51/457
nslruc/inn,
o
or your
sponsible
SI b1.4
100,
disk
npiratim
dale
US. funds. Order
;n
mailer at our
relaxI
51 0.
Iy PO
re-
obj,,,4 al
drive,. pdnlen. inleRraIed
or
semiconductor,
software,
ftware, connector,
LED,,
Phis mere and more/ The wide,
selectional the lowrl P e
i': IV, 52,
2 /Fs
r
SONO FOR FRF, CATALOG
FEATURING:
Computers and a0ce,v,rir. di,k
Perle, and more'
Cal No. 2055 Dual
Cal No. 2245 Single
back! Not
I,r
limit quantities.
$1
DRIVE ENCLOSURES
beiRelne- Dual
rnepiete molded
521,0
errors. Some dean subject Ir
tek. We reserve he right
Is;m 1002519061
f rim Shugart. MP?.
'reinsure
8 for
rim í2N39011
Single encknure 6 M'OP;001 meta/
or
1
characlerislir to
in
19158
No
8
Plea,e
include phone number and max
aaineltsue you are ordering
horn Prices .arid Ih,u C: da, or
date. SHIPPING:
USA
addcover52.00 for
he MO 2 lbs. I or
ground add 15C kw addr1 Ih. For
air add 754
d
W. FOREIGN. unlace add 51.00 Iter lini
2 lbs, 604 per addii lb. Air: add
511.00 lot lint 2 Ibn. SS Im ea,
aride) Ih. CODs S1 addll. Guar.
an )seri olisla5rm Im IIO des,
SWITCHING TRANSISTORS
Similar
II:
,up
S'r"
reins. we
'5
5
, holdsnd
MINIMUM ORDER
126V N 7wmA with 6'
line cord
2N3904/ 3906
1481
,
by phone or
112V
0Á
161
HOW TO ORDER
h, check, Ma,1errh,rp,.
Via 01 COD Charge ode
Sale
4 184
2
El WOrnA. open frame.
PC logs
24VCI ei 00m mela1
20
I40
15
d;sketle,
500mÁ.
9V tal encased
20V (d 6A, dual primary,
1
lo
mailing'
Please include
wt
SV
cr for
l plastic r raseage
Order by Catalog Number
lA.
115
25
LIBRARY CASES
$10
3 for
55
BS
2.80
r DISK/DISKETTE
TRANSFORMERS
Description
W
15
25
disks`
4uun
ed by rave
erohily
517.50
1
25
28,000o(
29.000.1
120,00001
be
Cal No, 1975
51020
75
'120.000.1
pletadore
Slew
516.00
520.00
570
SO
5200
Accepts romposi:le video no1Wl
Iron, computers, TV Mmes. HE Re.
quires 6VDC, opeeale, on any stars
dard as W TV. channel 2 w 1. Coos
11.
6.40
5 8,00
510.40
S
5100
20
2S
Sale
200
470,1
21,000,(
MODULATOR
min,te6,
(kit) ;nssembinsn
lath
nure5'
410.50
F
Villan,
400u1
1200,1
1450uI
2100,1
580001
rTV
rErrlirCtOrs
( a par; tante
78501
for $1O
12
e, by Cat Na 2147 and
IM1
Order by Car No. 1101
$1.25
Cal No 1142
separates like aip.cord, 28 Rage, 20
onduror, per inch wide.
rrr
Sale
Nighesl pralin
Spooled with
ScolchrBrand lope. WI. 2 or.
colored.
mbow
SI)
seacLnumber
Circle OW
ptne.ne lode
coo,
as low as $25
Business Center Dr. Dept. R3 Northridge, Ca. 91324
dadk. Warcrwl grey finish.
19511
CIRCLE 56 ON FREE INFORMATION CARD
i''
HOME of SURPLUS BARGAIN
o
.
ELECT o.0
-FRET
ßw2,
P.O. BOX 619 -(DEPT. R3) LYNNFIELD, MASS. 01940
Phone orders (617) 532-2323)
TERMS: Add Postage; No.
` _I
ze
-C.O.D.'.,your Charge Card Visa -MC -AE
$10.00 Minimum Order
Use
-
POWER SUPPLY KIT
t'~p1T'
Oe f
Ì_
II
499
INPUT
í
115 VOLT
HZ.
"
`J
e
a16
We supply all electrical and electronic
Parts, you supply labor & mechanical
Bat tools, & case.
Battery Charger 12VDC, 20A, 20 Lbs .
7070005. .
(20A)
Battery Charger 12V DC, 15A, . 15$19,50
Lbs,
9C0089. ,(/ SA
Battery Charger Kit, $Super
Up to
35VDC, 500Ma.
Logic P.S. Kit. 5V. A, R2e9ted. $6.00
7C 70267
5 TO 24VDC
Reg'ted & adiustable,
5 amps,
Sh. Wt- 15 Lbs
6M160101
Biel
1
g,g_
-
RECEIVE1i-
AM/FM-MPX STEREO
@ watts (RMS)/
*Tape inputs Phono inputs
Fully wired & ready to install in cabor wall *Cabinet available 'Just
add speakers to operate
channel/
quad outputs available Complete jax
panel & many other extras. L.P. was
$199.95. IC/FET. Sh. Wt. 7 lbs,
@ = 12 wts
9X0538
$49.88
@ = 8 wts
9X0296
$39.80
Close-out special
4
rM
.'
II
Ma
.ter
.o
3 -WAY SPEAKER KIT- $49.88/pr
Famous mfr. has cabinets not assembled
but all routed, just "smap in" grooves &
glue to get complete finished cabinets.
As easy as 1,2,3. Try it and you will see.
We sell complete kit of two cabinets, 4
speakers good for 35 Watt (HMS),
terminals, ducted port, grill stuff, & instructions. Size: 17"Wx10lh"Hx9%"D.
$49.88/pr.
2 for $49.88
9AB0460
ALL ORDERS
CIRCLE
ELECTRONIC TIMER BOARD
Microwave oven timer board - rag's
3 x 8 switch matrix. Make a 4 digit
time -runs on 115V 60Hz with data..
Turn things on or off, up to 3.33 hrsSh. wt. 8 oz.
D9CS0434
$4.88
3 for $12.88
D9CS0434
$12.88/3
9" COMPUTER
MONITOR (Conroe)
Must be modified
for sync- with data
used. L.P. $200.00(9raen-phosphorl-
Sh. wt. 25 lbs.
LTD
ONLY
-
CITYchannel
91380154
$38..88!!!!!!inet
COMPUTER DESK (For above!
-
528.88,.,36" o 24" o 28".
9220482
ONLY $28.88!
KEYBOARD also- 9130159
$28.33
-
-
-
10% OFF ON
s
L1 .
"AUTOMATIC RADIO" SAVE $51.07!
AM/FM CAR RADIOS
These puchbutton radios with front/rear
speaker control & power antenna switch/
burglar alarm control are completely built
I
-41110
:)
vim.
ti
-
e be
CIRCLE 44 ON FREE INFORMATION CARD
1110
,
CASSETTES
RIBBON CABLE
la
1.30
120 for 1,30
12 for 1.30
20 for 1.30
100 fa 1.30
120 for 1.30
12 for 1.30
60 for 1.30
80 for 1.30
20 to 1.30
50 fa 1.30
10 for 1.30
6 for 1.30
130 for 1.30
12 fa 1.30
12 for 1,30
00
1.30
30 for 1.30
130 for 1.30
20 for 1.30
10 for 1.30
100 for 1.30
20 for 1.30
8 for 1.30,
24 for 1.30
120
1.30
130 for 1.30
30 for 1.10
2 for 1.30
4
20 for 1.30
1,29 12 for 1.30
1.29
0 for 1.30
1,29 130 for 1.30
1.29 400
1.30
1.211
Reg
4
I291
COLOR CODED
SWITCH
1.29
1,25
1,29
1.29
1.29
1.29
Pos
1241
8460200
COMPUTER
GRADE
CAPACITORS
d
r C10 DATA
tl4
WITN
VOLUME, SQUELCH, CHANNEL SELECTOR.
SPEAKER, and DIGITAL DISPLAY are all conveniently located when your fingers do the talking.
Comm with a ft. multi -conductor, tolor.coded, coiled
cable, isponte) for easy inteirration into any typo of
rig. Sis: VA" s 254" a 1h". Wt. 9 en No. 02C06181
lA RECTIFIERS, 194007, epoxy case, axial leads, 105926)
6-23 WATT PLASTIC POWER, 2N6100 eerie., TO -220, 200bvcbo, 3A, (#1716)
4 -CALCULATOR AC JACKS, 3 terminals, take mini plug, (#23161
65 -PRE -FORM % WAITERS, popular valun,_la PC app). 1#244)
200 -PC BOARD PARTS, boards loaded w/100% parts, hobby bonanza, 105946)
40 -LOW NOISE RESISTORS, 1/8 & 1/2 W, oxide & magnetic film, 10220)
4Opc-SEMI-CON SURRISE, aest zenen, diodes, etc. unlimited, (02226)
20 -TRANSISTOR ELECTROLYIICI. amt. nollateR trOm 5-100 mId, (#453) -,
1-LASCR OPTO COUPLER, type H11C3, mini dip, (05700)
10-UPRIGHT ELECTROS, 100% aset'd vales and voltages, 1059001 2 -GE 3W AUDIO AMP, type PA -263 IL chip, mono, 1015221
1 -MERCURY TILT SWITCH, N.C. rated 24VDC
6 ,OSA, w/leads, (056861 .-,
S0 -CAP SPECIAL. net values In mslar,.mica, ceramic, disc,
etc. (#3775)
40-FEEDTHRU CAPACITORS, used
hams, RF, UHF circuitry, '034481.,;,
40-PLASTIC TRANSISTORS, aset'd untested and hobby, )#2604A/
4-4V INDICATORS w/leads. test )amp manufacturer. excess, 1058931
4.12 VOLT LAS, w/lads, popular voltage, 100's of trees, 105942)
1.12Y0C c/1LSNMn lmtarlo Guardian TóaGitiolo,ger, 3/4" 'Hoke, 1060131
10-AXIAL ELECTROS assorted value and capacitance, (#5901)
10-POWER TAR TRANSISTORS, NPN, pl«Ik, TO-220, (05629)
6-PRECISION TRIM POTS engird single, and multi -lams, untesjgd,
1033101
20-148
4 NANO, SWIMMING DIODE, axial leads TOmA, 100%,43016)'
2-5.1V STUD ZENEI, 10W, DO -4, 5% tel. Motoro4 10M3 or equiv. (#5207)
4-USHRUTTON ALARM SWITCH, 125 VAC lA SPST, NC, (#52119)
6 -CARLE & PLUG SET, 2 cord, 215mm mini plu w/6'polarized cable (#3737)
KS,
142E215TQ1. NET W
oiled value in dips and single, (#5699) -. -,
4-VARACTOR DIODES, car. tuner capacitance, 20-50 pf. 105887)
SEND FOR FREE CATALOG
22(
domed
Take one hoed command of your mobile or lumens
with Hy.Goin'. One Arm Badit Mike. ON/OFP,
N
O
16<
1470
ONE ARM BANDIT
MIKES
la
O
12
1198
40 -TWO WATT RESISTORS, carbo-films, carbons, some 5%en; (0456)
1.29
00 for 1.30
D 50 -TERMINAL STRIPS, aset'd solder and screw types, 2 lugs & up, 103341
1.29 100 for 1.30
1 -WATCH GUTS, LED, who knows how good,
micro-digital bonanza, (#31151 1.29
2 for 1.30
10-1000V
D
164
18
r
1184
open frame
a.0
.
$15
ter
1007
104,
i
2 FOR
8t
84
84
40
.Ì.-.
1.29
60 -TUBULAR CAPACITORS, AMA100mm(to
AMA
-1ml to 600 WVDC, (x3SA219) 1.29
6 -MICRO MINI REED SWITCHES, 1" long, for alarms, relays, etc., (01251) .. 1.29
10 -TANTALUM ELECTROS, mst'd mini, axial, hermetically sealed, (058481 ,. 1.29
D 50 -DISC TYPE CAPS, incl; NPO, hi -Q, mylar, ceramics, aast'd value, 4437) 1.29
60 -COILS 81 CHOKES, aset'd RF, OSC, IF, arnilic types, 1#35A297)
1.29
6-SWITCHCRAFT PHONO JACKS, hi -Q, chasis mount, teflon base,
.
1.29
30 -SUBMINI IF TRANSFORMERS, met slug tuned, shielded, (035A9)
1.29
40-ADIUSTAOLE FERRITE CORES, center cut tor hex adiuet, (#0701)
1.29
10 -PC TRIMPOTS, screwdriver adjust, needed value, (#3346)
1.29
25.4" CAME TIES, plmlk, like Ty-wrap 'tee, 45217)
1.29
5 -CRYSTALS. may Include; C8, ham various shapes and sizes. (#5716)
1.29
3 -MICRO SWITCHES. SPST, NO contacts, plunger style, solder tabs, (#5705)
1.29
O 65 -MOLEX SOCKETS, "on-a -ship" for 4- 40 pin ICs
(#16091
1.29
6 -PAIRS 9V BATTERY CLIPS, wired
black color -coded leads, (#2852)
1.29
6-LM3401( VOLTAGE REGULATORS, 5 10 24 rolls, TO -220, (#397)
1.29
40 -POLYSTYRENE CAPACITORS, nerd values and voltages, (#1052)
1.29
15-THERMISTORS, resistors that change with the temperature, (#2040)
1.29
65-% WATT RESISTORS, aset'd values, metal film, marked. (#57971
1.29
10 -MODULAR SWITCHES, Centralab "push-on" type, up tooDT, (#319) , 1.29
5 -"MOTORS MOTORS", small, high speed, aset'd lazes, 3-6VDC, 42551)
1.29
50 -MICAS met. size -n -shapes, incl. "silvers" too! (#373)
1.29
10-TRANSISTOR SOCKETS, for nog and
1.29
pnp types, (0@0_40)
4 -HORSY VOLTAGE REGULATORS, LM -309, 320, 340'e, TO -3, (03330A)
1.29
12 -PANEL SWITCHES, «totted elides, rolarM, modular, etc. (#295)
1.29
60-RESISTOR SPECIAL, ra to 1 watt, carbons, carbo-films, etc. (#35196)
1.29
63-HALF WATT RESISTORS, asstd. carbon., carbo-films, various valuer, (#454) 1.29
15-HUMRUCKER CONTROLS assorted values. manufacturers dump, 1038071 1.29
P 1 -POWER TAR TRIAC 100% 04me. 400V 10A TO -220, 462161
1.29
Only
151
04
Ye.:
/p.
f e,
3"012" high quality G-10 glass, 45694)
$14.99
Sale
14
1
HY - GAIN
Reg
1471
i
(al Nr.
guard. ,'
L:mrlec/
Pin,
%
a .I
'
ILdhe,l (10,
Order by Cal No. 1117 and pin,
Cal Nn.
1119
_
2 -DOUBLE -SIDED PC BOARDS,
PENNY-A -PIN!!
M19 r 6
2
Poly Poke buy. up factory clone out rom Hy Gun
you gain! Boord. have: Heatamked 9 Watt Amp
Chip RF
d Mod Tramli.tors and Motorola MC
eerie. PLL. May he u.ed for 10 meter conversion. lase
continuing eerie. "CB to 10" in 73 m.g.sinel. The
port, alone make it an offer you e.n 1 reto.., W t. 9 os.
Cot. No. 02C1/1/114
1.29 100 for 1.30
1,29 1201a 1.30
1.29 60 for 1.30
1,29
81a 1.30
2 for 1,30
1.29
1.29
2 for 130
129 100 for 1,30
1.29 60 for 1.30
1,29 20 for 1,30
1.29 50 for 1,30
1,29 20 for 1.30
1.29
O for 1.30
1.29
2 for 1.30
1.29 200 for 1.30
1.29
0 for 1.30
1.29 80 for 1.30
1.29 30 for 1.30
1.29 60 for 1.30
1,29 100 for 1.30
1.29 60 for 1.30
1.29
12 to 1.30
1.29
20 for 1.30
1.29
/0 for 1,30
1.29 12 for 1.30
1.29 12 for 1.30
1.29 12 for 1,30
1.29 10 for 1.30
1.29
2 for 1.30
1.29 20ía 1.30
1.29 120 for 1.30
(213)
FDIP SWITCH
SALE!
SALE
-F-...v.
(800) 3408401
10CM OUm!
OUT11141123
e2A
ELECTRONICS
IC SOCKETS
rM:
8 7 ou
IN CALM:
7 ON FREE
up in Japan, but to get a low custom rte
the radio was assembled in Japan less dial
& face plate & Pointer. We supply stuff to
Put together a complete radio - Si ìn
foam packed oxes from Japan. Maria to
for $79.95 each Sh. Wt. 12 lbs. 9DS0376
Car Steroos 9D80402
9x11
$38.88 ea.
$49.88
Send for FREE cat'I, -visit our stores,
177 Washington St, Peabody, MA, or
Towne Dumps 777 So. Willow St.,
next to Woolco, Manchester, NH.
of over $10.00 from this ad!
INFORMATION CARD
1
DIGI-KEY
CORPORATION
-800-346-5 1 44.
1
TOLL
Quality Electronic Components
DON'T FOR ET OUR
DISCOUNTS WHEN CO PARING PRICES
...
INTEGRATED CIRCUITS
TIME -TEMPERATURE
PROGRAMMABLE MODULE
TEXAS INSTRUMENTS
I.C. SOCKETS
1111300ü111 1100016105 I
(MO
7480 111
USERPROGRAMMABLE FOR:
au01N
4036
104
d m » 4.x.e.nn
0311
N.3
p5N
31:
p
.42
Oam0.722,
65
31
F23i
00
211
78
46
9-9s-
.
/11..
67
6MÑ1Siá
951i
Fi5T
05.
78
¡
P11
T WÑ jr1
X
5 63
1N
d1,Poq
4.94emxA d907 t.M'Arºd W I9wMnnM M.
W,1
50
A
63
tee.
*Mee 801.1ndweró.lw
we0id
...ID.
50 03
..
we..
107
rl
_
:
015
5306
1153n
115380
741.5310
415406
r1 Mmelent
7447x
7446
71W66
71501
7,15118
J4 51N
371N
74556
7615158
7454
765766
THE
8.06.74
II
67 00
6 98
Ned
t.
"PROGRAMMABLE"
r.6A.9+.1+7
77
59116
56 00
07 N
6 21
6
VI
I
aw
335.,74""'
4
296ó.
1/1166
8.
7
M
215.001508
38.10/531
4131589
4374011
1.
1154
ro.
5
16
sal
7t1566
437684
437653
569
.7.
m
b 2141023
1
1.1' 131924
476N4
1.2.
1111
N
1ÁD
432684
I185x
200
5264M
101C958611
1
3x198
413
4.3525!
1.29
4.3530
RELIABLE. COST.EPPICIENT CONTICT D[SION
7.N.
TWO 471e.m617..
50 /W6e 6691 4. 73
over
.Tryr.ae171-12. CA 125 dN1.
»N 1.4r
1290C
9w
NO*. tm9.4r 4P0g M.ip.
41.04
63
-1'e
14x5104
742616
742886
442910
7136
743666
R1,
be1
MN« .100"8.200- [3O[0O51.0 CO4N5C9068
f4« `5 I» 11.8: 78S riP 1.4; I]
64
4w 1
»
332
C611
71,56
10,60
430
41-31
C0.33
11762
15770
.30
36/72
443
15.40
176.00
C5-15
'
7.01
11740
re.00
iié
2.19
1143
165.00
ñ
3.03
3.24
3.36
3.11
3.17
4.62
»:
00
2711.00
.110 752.00
34,5 n4:«
3150
47.30
210.00
34700
Nm
<20
Minn .123"4.250-
17.60
14600
194
18..
141 00
1311.00
P
2.70
7473
203.00
2.94
27.03
221.01
c
C5-34
3.30 30.30
C3-43
34.10
3.81
ü
268.00
.6.00
]9.3 ]]1.70
4.32
.N73a/7N
CARBON FILM RESISTORS
.
' EN
5°.
.
/ WATT R
ub.
e'er,
RS125
...1
1
415
'1:
c
Siº
c
1.1/
17.
415
141.75
I
80 17 00
..
.59.90
40a. 44307 865157085 ASSORTMENTS
3040
w
31.10
234.25
C4-30
3.31
a31
351 32.20 203.00
2.01
0-313
431
26.70
3.06 28.10
RS2S0
710.00
230.00
FREE
m.9.
76aa1
744
i;=«tio
°1]N
I6]10b_, 100
4130.110141)C00401.00111'
80100A6DDDT4NICT0118
110,5
412
1.24
1.47
131,00
C3-15
1.74
11:3---977151
13.11 110,25
16.00 131 00
7.46
24 70
2700
7695
o
C112
0-15
1.47
1,21
13.48
16.03
14
12i/
.
007 -25
101 00
HOOK UP WIRE
.IpWC1.0/1010.77/'(7
46312 3.80/100 17.25/300
D0}e ROOkB
4G1a«.4a..dY.A9a.x4.93224
i»nx.N.N.w0a.8..IN74
A49.1Ca.x..BnM
''I774r4.1Ca.8e.9nN
061141.a..54u-e.90201
144.14044444.4.01 .x..w461
7Iw
A,.Mr1.r4..u7
«.se4.xe.4.71+/
-
STRANDED
600
a.»ea nduCFOr
M^6
The Entire
AP Products Line
2911$ 2.10/100.11.251300
1.00
c
iriMeY.77
KI6
3.
IS
190
3
117
745170
50
4077
80
1
25
25
1
1
I z5
5
1]
19
xl
/.97
1431
1]
1.11
1.15
9.22
10A2
.20
75
15
.23
1.91
15.87,
21
74.31
15.28
31
.31
1.65
22
15
1.73
1.84
1. x5
22.05
21.70
100/16V_
1
1 V
19
1.61
I3.w
.26
2.24
19
161
1)./0
.31
2.65
100/359
22
]3
7.61
211
15.28
61
3.46
6.95
23.46
.w
361
30.01
27
1.11
.a8
1.34
2.65
3.57
1.14
10.50
1001526
270/126
10I16y
1101252
»
213/]5V
230/526
36
11
1.1
16.60
21.15
11.07
.1315.87
34.48
45.28
1.N
1.11
3.U9
.31
1441
12
7570
49
].92
2.90
.24
21.05
29.75
31.44
11.10
19.50
22.05
.N
58
21.59
14.48
18.6022.05
330/99
21
1.74
310/126
7]011ev
22
1.M
2J5
1528
.31
21 45
A2
2.34
3.65
1.57
31
2.60
21.64
46
3.92
3x 59
.48
.51
1.06
4.61
75
661
51.39
73
.11
.92
71
;1:.7372
7232
24.]3
67
6.19
2.45
3.57
1.02
22.05
29.46
33.17
.55
1.72
19.20
5.23
43.70
6243
33.36
31.70
lx
33/x59
330/354
330/506
4ro/6v
470/709.:
_21
.
N
2.09
25.70
.M
41.73
7o00/eV
1000/100
1O0o/769
0001150
1000195V
2210760
N
7.09
7.81
59.03
23.66
17
3.10
44
275
45
6.17
4B
2200/1074
61
4.85
1.08
5.30
25.80
31.23
53.39
5J.92
33.91
36
70125V
1701]SV
51
470/500
83
517.0
3
.BB
.17
.52
SI.S>
7.0
1.07
4.11
37
486
5043
.91
.51
]6
56.99.
60.10
1.N
b.72
.74
6.32
5244
68
74.Ie LI1
750
9As
6278
e.M
.3
57.02
66S
38.38.
6.&
6.68
e.N
5.70
47./º
.6
330Ì12..-7.Ó
B:W
164228
I:1Ì
8."
58:28
6
l3.12
BA
172.5á
72.J
43
3.04
11.16
10.36
106.37
86.27
12.63
105.25
1.48
106.39
59.01 l.54
I1.M
53
4700/704
511,50
62
41.13
N 8.O
4700/166 ...1.46 1165
657.50
2
.
33.70.
2200/759...1 01
61
3300/64
3300/254
1700/69
6.33.33
2:2,9.92
3
220116V
517.50
x.3
32
.
170/169..
90.00
7.76
39.w
72.25 1.22
123.75 169
.
630I6V
6300/ 426
...1
N
-
__
10.000/69_136
1.27
96.37 1.48
11.81
e4Wn69.._
10.0001104.
ro.a5
e.O
.
38
1.89
6.3) IA7
11.81
1.46
55 00
I6d9
131.10
12s5
101.H
134.88
16.19
PANASONIC POLYESTER CAPACITORS
IMI"IdLEW
VD(
2755
101.1177.C1
rrnnut 10
5180,
1
1100
118
10
1
.0015
0011
1.
17
xG.
f
029.11
17
75.
I
17
75.04
0027
1.7.6217
1
17
73,04
134
117
86
75 04
07377
;71"7
30.4110,794Mn.
T5
1
30.111. .1044. 67 05441 Lene
r woo ...eh
W7
1163
15
IN
15
228
10
072
33::321.7.15;.=12,,,
p..a1.N.n
01133
..
Dig -Key Means
33
1.40
1312,
1136
quality Products, Tol
W 91 P ta P id Fn
__y. cprs: . mAºee HAIICE - 3X
Panasonic Trimmer Potentiometers
068
I
I
Fr
155
18
bZ
U:é5
ttl15
16.01
11
17460
19007
IN
2
1
1
5
7
1
7.
.
I
7
64)90601
1
J
1
1
66792600
)
9
61
61
61
61
81
7:9
9v
6
0.
men
MOM. fl.4W
.1511 2.18111
12,4,_123.93
Ó3
21 00
10
300
500
40
32
37
16
6003
6003
60410
6.4
32
32
1006
2001
2
40
021
3.ON
1219
151970
27
1237
15.42
2.49
2.08
20.72
72.71
391
24 25
1y8
-1310
7134
160.00
21,03
21.00
71 00
71.03
21.00
71.00
71.00
1,22
29
52
34
27
1123
160.00
iLLr3
87
22574
roVer
'3131
00
21,00
160.00
21.00
1.06
PLE5SET MINIBO% METALLIZED POIYESTER
PANASONIC RESIN DIPPED TANTALUM
CAPACITORS
CAPACITORS
6
11
I:
1000V
1
.810
75
I
50115
21
~
PD
1001
1110
s
3501
TM
02
1.85
! r.«
19.«
!9.«
4 L«
1.
.
..
!
c0
1«
3 .538..1
x-561/xSCR
...
...
1-411/15GIW...
4.401/25QEW
8321/45QEW
5327/25CREW
8.108323/8SCREW...
4.3x5 eSUFw...
SSw
-
NARDWAPE
1967/I5Q
' w!
f
iözirt
CHARGES
Add 52.00
S 10.00525.00. _Add 50.75
S 25.00-549.99 . Add 50.50
5 50.00-599.99. Add 50.25
$100.000 Up .. N9 Chrge
S
O.00S9.99..
813.4
1.
1.
..
0,15
22
le.
21
21
77 71
fe el
aé
WATT EINER DIODES
1,77
/[
C
NO.:
1.A4Aca.1...«19éliá "aié
maY
-
4
°7uppllñi,'s¿°aoi m.6,ei,7pm4 oéP
[M1m29. w
:2P4. nee 1N
WI,
roY
401'^9
n
Dne
U.SeS
9ede
m13497K,
oltl (9mtl° ..hI.I,
207 20
228 20
VOLUME
DISCOUNT
AND11NGCMA°°E
e.9.P. ó0ne v^x 7°7a0p
S
0.00599.99
042
71
78 53
NET
100.00-0249.99.
f 250.005499.99.
S 500.00-5999.99
51000.00a Up
Si
.
Less
10°.
r.
Less 15°e
Less
,e)55O/C
.55/C
SSssi
_
20°.
_.PAI_0T090
PANASONIC DISC
4-.747
4.4476444
.2.I-.6°ld...l
Tre
9.11.
314
00
.... Lessssss25".
35.75
M
SILICON DIOUES
Money Order
51,37
4216 441-4474
Quality ElectronicMNComponents
(2181 681-6674
56702
Thiel River fills,
P.O. 444 677
t * + .
* * * * : * * * * *
CIRCLE 35 ON FREE INFORMATION CARD
www.americanradiohistory.com
g
RIFtrwmciireimamtiA4111
DIGI-KEY
CORPORATION
99ÌC
1.3p/C
.32
N803229[OIXWASMn
e9m,
eMnq .i1M1 M1e .ulli.XD
8, '9mG^ed 1°r'4sc0°nI. Fr47
m01 011 A4'wm4N, a,7F p^:
72mb24
Orders Accepted by Phone er 69011
Check
COO
VISA
ree
14701
P.O. 0,64 677. 1610/ 84r97 8.114,7614n.
M..E.'Q.
pp
I
A11
59.8
118.02
110
21
.16
1
R00RSELlER
Ni
7721
114
4.1n
5494
148814
-
200
200
PANASONIC TRIMMER POTENTIOM9'1RS
545
110W401üI5 ROMA
76.
C0110
6
1]011
64
2103
87113
D1 53
20 00
20
3 20
10064x0
110102
72.00
3
7001
5001
.53
247
32
53734
40
54506
750 901 610 minu. 10
70 00
70
3 20
3
1
17
17
)
3
8,u2
700
700
700
3 70
43
Ar
1
76.
26 00
74 00
40
PANASONIC METALLIZED POLYESTER
CAPACITORS
76 00
76
547913N
54)921N
:E
6
3 20
AO
00454
00415
08473
01615
01125
01455
0111,16
541909C1
54Ni5N
01482
01413
01423
01453
01114
01624
3»
00427
104.57
00113
001723
00453
00114
00424
0101
5470500
54109N
7..
1622
4002
HANDLING
M
214
1
1
8D4ACZ
5479011A(Z
1.'
7
ACCEPTS HECKS
nut
.27
.30
10.4218.60
la5
22
] 41
1
1.91
2.24
2.57
1.69
l5
1
78109ACZ
Ontt
IBli2ACZ
JBI156CZ
IC9286 7..
D1G1-RET CORPORATION
18.60
14.07
15.81
916
1169
331255'
9w
1
7011N
I5
316
15.61
2.21
1.99
10
23
l4
I
79
78L060CZ
40149
15
60
50
71LOSACZ
A
1.91
88
i 25
1
A7800(3
e3º111
7
.23
634
47915C1
1.
5
2.147876
80610180484
4.
w6M
3250
7.]
07311
5.95 02166
4538711].]
59.90/44
129
1
110113
13.'
1.69
7.14
74.07
.11
50
8500C9)
2826055
1.91
1s.Br
]0
OM
w1966 1.1
4122191.'
ä901N .4
90(96x
9.
.23
9.08
9 08
12.33
26
1,01.7
1
2571
11.07
10/1
7365
-
DOUBLE DIGIT DISCOUNTS SAVE YOU EVEN MORE!
CATALOG
Digi-Key Stocks
1.:4;Ñ
15730
4
.
3.15
7....,...
1.61
VOLUME DISCOUNT
1p6:;M :u/..v°:°"°
117/24
3á
0401 NEr
.
.20
1
1
.'
1
1152886
_
01
- -el
07.67
11.07
11.61
14.6)
0.4B
I
1.61
.14
1.1.
1.14
1.e1
7517.3
6.0
b
14
780801
e o cu
1C174
K175N 11
140 03
851 s0
31/62
-7
12.00 4092254
13.50 4C923N
73.50 4C925N
13.50
4014
I
15730
-7
1
50192936
)08
13 10
n71
,
.1301110.110
1
1.17 11386
a:"m.w"p..p°n:sl.Id,e.'i."59.90
11
w1666
IC113N
2
O80Á
!N46
8.41
6.90
02
IT.a)
1.50
.il
19
1.62
1.62
7805CÚ
7806C11
1
6446
2114..
C5-31
7
4534014
.1395N
374
Hxs.500111'
LV
]
0.71
Iv/»Y6.l2.elrP/1O'014í«1
144
1.83
1.01
6.0
11.67\
.17
22/500
2
78050
11
1616 I.1
1(9096
YNR
13.20
6.93
Win, aELNfn1rw499L1°S
4504
C16
4(066
1.4551/1,1011°d
151
I1.6
1.49
1.46
160.00
110.00
110.00
110.00
51.50
51.50
72.50
17.50
57.50
1320
.eIa Wirt W.«PN
17
74704
71801
6011 1.7
K16NxI
7
AOD]721(UI
Apt3111(04
p1CU900L(x
01
13.0
I.w
18
WIRE -WRAPPING WIRE
PRE STRIPPED
PRECUT
406.3070.T5 MM) o
]'
3J1d
1
w154 3I
>
]. .13951
9 139W
A003501
1.54
1.54
I
,
5v
74
70901
72304
]7
30.00
106.40715
-I8
11
IC
4133096
4W866
7
977.50
990.00
990.00
990.00
.98
75
2
554
546
1(90251
4.5r
111.44.15171.44.14.0..a..11111.1
C6
7.
3.
4415014
IC15W
k4dr
mer
417
1
w107N
1
4C7516
7436N
Or
k M. Roe 4..11.1....1517.2
1:;315
;
3l>axc.
x 50
6'
41336
1
096
Umç
lwea.
4
UN -CLOCK
Nr7.ld 27.75«3 We,
vero
85T.0
97.50
110.00
.V
.20
10I
09
-11.
Lw
70
1
1.17
1.22
4.36514
430881
4119966
71067(
11
.]
1.3
41986
97.50
1.54
1.41
1.41
t)
1966
76H
85x
40866
4090N
1:9
.9
6.73
10.13
13.20
1.01
..91
2
7458V
14969
1
C74
1
IC13N
:4:74::752402414.1.:102...7
1111%
4[1814
4152498
1
1.93
1.93
1.93
1.93
2.16
8.40
21
.81
717311...
71731
14
74131538
43158
4152346
2Ì
193
111131
17
ºa
5
431416
4
..21
..21
ls
13
544
91
46
1.93
1.09
.7 7
1
1132
403N
H!
.21
.1.54
4aox
432448
1.9
193
1.03
8.53
9.0a
4.53
8.53
1.41
.I7
W
CG4
61519111
416
_44.444459e-°
COBN
.7
91x77
205
(02
iiáN
:.
21
s.l i1iº(
717301
1
21116
21116
29079
29175
431932
1.3
11
154.50
180.00
180.00
157.50
157.50
157.50'
157.50
151.50
151.50
154.50
121.50
630.00
1.03
1.09
.17
1.15
1.09
1001126
18000
20.00
10.00
es3
13
4C 4
1.1
14194
05.544
66
66
13101
18004
18028
C286
41666
1192N
111936
3AT
00
40311011
'43
451853
1901
N93
..
.
V,:
]'
1.)'
181311
183014
431114
44.5174
051786
41J434
IN
723
91519áÑ
7417N
799148
SaO
13781N
4
gil
l
38
1
4151601
41786
41766
741116
74 806
9dY0nx14..Ira4A.AMM7
I.1.
1.1
4316151636
74181N
Ì11816
aT9.r] 5.7.140
1270
241
6.
431616
741 ON
P..64.
5834
7.1
.17
416
159.0
717131. -
776
I.2
516
518
519
520
522
1.
)1
416
reek..
073.14
6
17.
a..1
1.0
.77
41609
41016
W
10731
CO
7416
7416
71m
1.1270 re
521
1.1
512
514
4431556
1.7
0,74.7,7401144
TEXAS INSTRUMENTS GOLD
511
1411W
711486
741506
741516
11536
MOLEX I.C. SOLACE I PINS
'.F5/C
11151316
143151x
31564
FEATURES:,66.114841897.1.7.
.6'..A441
1p
140
510
77.0
8.53
8.53
8.53
10]
13
3]10V
561.0
35.00
19.50
20.00
10.00
11.50
17.50
14.50
11.50
11.50
14.50
11.50
71.50
72.00
..
17127.
36N
331.50
77.0
..14
..98
..
31.50
62.50
45.00
19.)5
..21
np
3300
1.93
2.10
2.20
..
71P1 17
3.30
1.03
1.03
1.03
22/x54
22/ 559
3]/169
562.50
427.50
427.50
450.00
103
...21
10/33V
13.50
21
16295910
1,13013
3
495
m/5W
22116V
47/100
47/144
47/359
47/509
47/526
50.00
50.00
41.50
47.50
41.50
50.00
12
12
10/250
33/350
4.80
6.00
7.50
5.70
5.70
6.00
4.80
4.50
l2
10/11V
33.N
360.00
360.00
72
73
11
11
13
1s
.3700
3á3.0
12
u/50V
1100.05
41.0
4.3
_7/509
1/526
1.2526
3.3/500
4.1/353
111.0
.03
4.4.5362811.
0453047
91253693
6429030
71
25.00
25.00
11.50
110.50
..11
.11
97453565
1
773
431518
2 -fix0
4.05
10
053
43138N
56
INLAY WSM KIIIAP
4W45
,066w.q
.
1.1
21s0
1.90
2.20
2.20
01353393
1.11
.
146.15
146.25
151.50
161.25
151.50
157.50
180.00
180.00
1e0.00
302.50
981.50
247.50
225.00
215.00
J7.50
21
14P33393..
1453394
9153395
61353560
922
4.3
71
01425390171
4131.SISáNx
inn
046179.
11
1
13i
.53
.88
.51
712527124
429523696
N1115N
..
6
M14
1 0
56
351136
L34
°
81.726.22
6
>7
Nei no
co
n
.10
6111711
5)
o
.3 435366
4936
4
5 1
67
_67
,.
7NE103
914803
761102
8
14
N
..
019
6 74312/N
)4929
70
46.11772..
13
1
W
53
.56
.56
5731121
2
Z
':;.
6
.
911520
Z
56
...
911311
1
279
1.7
1
012
043
044
I
Ìi)
66
11
2
.35
39
1.47
601344
911370
743177p
74953
14
64°;07
r
l
)7
lw
36 00
70
3
I
4
146
2.7
1.3
35
.AÆ3419
34
B'
034
034
35
39
MAI»
221
7
1
6511361.
1.7-. ]43111N
I8x4
....
165
51
611183
74310W
11166
.2.2001
1
115506
46644
c
1
I
O17
743938
9
78
27
7017955
IOM81
P21-9
.24
937771511
51
1.1
751
747
CLOCK MODULE
78
4
)1
x0e..n.6.""".ILmi3.I,.w34.r
11.14.
áñ1
9
1
0
14456
74686
044444440/4444446645.646.6.764211334
.Ai.
7,57.r.re
...
61730C. WO* WIMP
38
186
094
015
4138575316
"1rw°`e.ad:6nró2i9M61m7°'n:06111611
410.7
9a.
n1
1.0
...24
'
PANASONIC fLECTROLT TIC CAPACITORS
'
16.25
16.25
17.50
18.25
17.50
17.50
20.00
20.00
20.00
22.50
47.50
2.20
2.20
2.20
1.68
4.69
3.30
3.03
3.00
3.30
13.89
4.60
4.50
.24
265089
265410
165151
91711016
92D110
92711154
1'
.12
145398
14L551N
7115516
eu1w7HN
918:61,27.111.1
TL4.
N
DIB
1
4.426
4W1N
7:9
--.xuwlxwnl
14rM9WA4nT
M.
712W
MA102611 ent0214
122:41:177:1.10.2461.1172.:44. W10214
0«'
/,L52aN
111116264 0.71.7744.71.10726111410160
17415141.21.07021. 0
01
1)W
4(5 189
4481882T5242
en.. perne
10
I171W
MMe6w11.1w4Yam17.11.6d0.Nla
40417
1.490« DqM3.xNNPed
wwnd741.9
1.452.2111.9n
.415279
74266
11486
7446N
AWrM......M2nr.pa.408
won.
9áN
ll7
7
415186
.0145.....12.45
)NIREWRAP DIP 101:61113
k 9en4ett4
I
742382
74
74.386
71396
74406
4
iv-
sec
FasoX0311
L
4
..
2115081.....
1
3
-
.74492.411.5.721
rand 6.250,14.'hlwr.,°1v9 Ag6-mama.
9274
IV
50
.
.
19
I
A9. 422407717.15.5'
6fr 4µ
46w0'
.i7cpw+D.aá6..pW4w
.
1.1116
4
20,1e5re4°
DO
«tl1
6tt0114L61SOLDERT61L
193
1714
71306
FEATURES
20 03
21
7
4
W
)4236
167n201107x.1,5,
214411.
214410
1
177
713118
OSN
1.93
.16
)1176
9we*
21
715
1416N
..6e.ne
161101
1
74136
8184
200
2.01
714
1151
51CW
70
1.99
7111N
1414
25390e
1114124.
22
IIN
9.
1.79
1.79
71
IM
314151
20
314126.
7
5714
1W1N
1057_
I
2:
3536
3566
115101
SILICON TRANSISTORS
1.23
'
113904
3516
2
4xlnu6u1411c0ADn
INLAY SOLDES TAR
1
5
S
37416
11086
74064
4124
6
1
115NN
wW
4
óV
006
4W2
7466
Ix+1.9.s..1...1
.001
a
11141481 C.
1.
íA3056
3476
4L50
i14óá9
SOLDER TAIL DIP SOCKETS
7:22-1wWio4 291
218-681-6674
AK., HI. RESIDENTS
FREEMN.,
SWITCHES
I.C. SOCKETS & PINS
DIODES
CAPACITORS
TRANSISTORS
RESISTORS
I.C.'S
DRAFTING SUPPLIES
BREAD GOADING 6 TESTING DEVICES
OPTOELECTRONICS
CLOCK MODULES
WRITE FOR FREE CATALOG
TOOLS... AND MORE
WIRE
HEAT SINKS
DATA BOOKS
134151
15044
04211
TAM
"."014471
0T40
01031
e
6.
vIt
TN100.
Dlñ
SLIDE SWITCHES
50
45.50
ap06asm4.
5
»
113
ro
N
70.00
0
4
A
I9 7I
L
.7
f
1¿41
#
4
.....
.r
a9
6
! t
.
930
.10
79
I
95
KIT
SOUND EFFECTS GENERATOR BASIC
CHANEY ELECTRONICS MATES IT POSSIBLE TO BUILD TOUR OWN
BOUND EFFECTS GENERATOR WITHOUT SPENDING A FORTUNE. WE SUPPLY
YOU WITH THE 1176177 BOUND CHIPPL UB'AN ETCHED AN0 DRILLED
CLASS EPDXY PC BOARD WITH SCHEMATIC AND LAYOUT INSTRUCTIONS.
TTIS BOARD MAKES IT SIMPLE TO BUILD A GENERATOR CAPABLE OF
CHASER SOUNDS, LOCOMOTIVE, SIRENS, AIRPLANES, CLOCKS, ETC.
ODES NOT REQUIRE DIP SWITCHES OR OTHER EXPENSIVE/UNUSUAL
YOU
COMPONENTS.
PPLY ONLY A FEW STANDARD RESISTORS, CAPACITORS, SwacNE6, POTS, SPEAKER, 2052222 TRANSISTOR AND 9V
BATTERY.
8A1110 KIT CONTAINING
C23883
1176477, PC BOARD
AND INSTRUCTIONS
STEREO GRAPHIC EQUALIZER & PREAMP
Octave -Band 50 hz 10 12,80018 CTS Slide controls
Scow
oM u
ÑS
oMY
2N2222 TRANSISTOR FOR
ABOVE
continues to deliver.
$5.9
EACH
Il
YOU HAVE ALREADY PURCHASED THE 7176477 CHIP Y
MAY BUY
THE PC BOARD AND INSTRUCTIONS ONLY. C23885
64.00
-
IF
SLAVE TRIGGER
e Flasher
SUPPLY ALL THE OTPOHENTO
US SCHEMATIC TO MAKE A SENSITIVE SLAVE LS IGGER WHICH
Is
250
(4 MHz),
INS 80
a
a
I,aAmHn
or the
ei
ALLEN BRADLEY Type M conductive
plastic volume control
°Adjustable input sensitivity: .3V to 3V RMS
(Bourns MFT Dual trimmer)
\a
Instrument -type min. toggle switch
2
accurate clipping lights: one on preamp stage,
one on EQ stage
All 3 LED's are Hi -brightness types
(8mcd at 20mA DIFFUSED)
Wiring & mtg. info included
80 WATT STEREO POWER AMPLIFIER
Assembled & tested circuit board.
American made $67.89 (Class B $61.90)
Ready to mount to heat sinks. Requires 27V
assembled, or boards qualified under our high -reliability CerllWd
System Component (CSC) program (200 hour burn-in, extensive testing,
immediate replacement in event of failure within year of invoice date).
79
$8.00
120 VAC
(91
a
Xenon
Strobe Kit
NBK
16K
16K
24K
16K
32K
32K
32K
Wheel of
Fortune
. -...se
O
h- =.7=90
®O°OOL°OL°L1717CIaOL31 L°OOL°OL°
$7.5o
'ae
LED Panel
OPTS
Mounting Kit
12 sets
FSOLATOa6
a
for $1.00
RO170
lei
tor $1.00
100 for $15.00
5
Tube Specials
107400
Nicad
zr
494EAL-
CHOICE
1AJ
VV
III
of
Ejjetc
uniue items
5539
$699
5359
$395
$729
S649
S849
S459
n/a
n/a
Trademark of GetWeel ESClronics
Is a
etc
ae
Zr
an
.6" JUMBO LED
7 SEGMENT
-
99W
(I_
..
POTENTIOMETER ASSORTMENT
A mix o1 new, panel mount 3/8" bushing pots in various values. Some dual,
some with switches.
10/2.00
1/2W RESISTOR ASSORTMENT
(Asst.)
Asst 200 pieces/2.00
SLIDE SWITCH ASSORTMENT
am. Includes miniature and standard sizes and multiposition units. All new first quality, name brand switches. Try one pack and
you'll reorder more: SPECIAL
12 for $1.20 (Assortment)
An
e
023 VOLT
50.
263028 P.U.T. W/SPECS
íM380 2W 80010 IC W/SPECS
109
LM377 DUAL LM380 W/SPECS
X50
ILI
REG.
IA 155
OPTO ISOLATOR MINI
SMALL.
100/2.50
SERI SOUND KIT.
89
6/1.00
8/1.00
ITEM IS
A
r
3-
x
PC
12 VOC
$S95
7 77
DIGIT AUTO/VAN
a
LARGE'
WITH
CLOCK
OEl.
El.
CHARACTERS (LEDI
ARTZ
TIME
ALARM A SNOOZE OPTIONS
NOISEFILTERINGG
O
ASV TO
.
15/1.00
3/1,00
50
'Ixoturfs
FIT ON
TAO @ 5 WATTS. COMPATIBLE
60
PFD
PPS° TAB PNP POWER
'MC135IP FM IF. DISC IC
AND
AN INEXPENSIVE AMP. LESS THAN 3%
yg
75
80
50
KIT
IC
GREAT FOR ANY PROJECT THAT NEEDS
69
DIP
Ill
HYBRID
BOARD (INCLUDED). RUNS ON
SIMILARTO40673
M51821 VARICAP DIODE
154003 IA 2005 DIBOE
SINGLE
COMPONENTS
MOSfET.
631 DUAL GATE
0100E PROTECTED.
75
je
ll
/
(((TyyJ,,,TTTQ
1(1.+: 1
7
AY3-8910 PROGRAMMABLE SOUND GENERATOR
The AY3-8910 is a 40 pin LSI chip with three oscillators, three
amplitude controls, programmable
noise generator, three
9
mixers, an envelope generator, and three D/A converters that
are controlled by 8 BIT WORDS. No external pots or caps
required. This chip hooked to an 8 bit microprocessor chip or
Buss (8080, Z80, 6800 etc.) can be software controlled to
produce almost any sound. It will play three note chords, make
4w ,
ASSEEMBB LE
a-.,-
NV
DRILLED a PLATED PC BOARDS
$16.95
c °Melon¿x'T
"ROUSExuaeHEO-
ULTRASONIC RELAY KIT
LED'S
JUMBO GREEN
JUMBO RED
MEDIUM RED ('/é 1
MEDIUM GRN OR YELLOW
bangs, whistles, sirens, gunshots, explosions, bleets, whines,
or grunts. In addition, it has
to control its own
memory chips with two 10 ports. The chip requires +5V
75ma and a standard TTL clock oscillator. A truly incredible
circuit.
$14.95 W/Basic Spec Sheet (4 pages)
60 page manual with S-100 interface instructions and
.soVCEO
r
LEAD CAN
N.
13741 FFT INPUT 741 MINI DIP 3/1.10
30000 @ 155 COMPUTER GRADE
2.10
211100 NPR GEN PURPOSE
1/1.00
284407 PNP COMPLIMENT
6/100
'7815 VOLT
NEW ITEMS
3/100
301 OP AMP 8 LEAD CAN
'MEN
(CÁ3046) Transistor Array
400V 6A TRIAC TO -66
RCA Transistor Array
Power Op Amp/Driver
Prime, Full Lead
Quad Comparator
High Freq NPN TO -92
NPN GEN PUR
7 WATT AUDIO AMP
PARTS
From T.I.: TL490 BAR/DOT DRIVER IC. Drives 10
LED's with adjustable analog steps. Units are
cascadable up to 10 (100 steps). Drives LED's directly.
Great for voltage, current, or audio displays. Similar in
features to LM3914 with specs and circuit notes-
a
gprovisions
A good mix of 5% and 10% values in both full lead and PC lead devices. All
new, first quality.
-
76477 CHIP IS INCLUDED. EXTRA CHIPS $2.95 EACH
814.95 LESS SPEAKER 8 BATTERY
m0
Q
QPa
Twee
NEW!
NOW LA OSUPERad READOUT AT A Sejec s BUol Tb
ere factory a0sh
prime LED readouts, not seconds or rejects as sole by others. Compare 01,1
price and send for yours today, but hurry. the supply is limited'
SPECIFY: COMMON ANODE OR COMMON CATHODE
f
go I2
fi
6640 COMMON ANODE
6920 COMMON CATHODE
e
t'
'
--
RED
.Ç.
G
CIRCLE 45 ON FREE INFORMATION CARD
Po race
XAN SUPER DIGITS
8.53
ALLEN BRADLEY type M cond. plastic dual
Aud. taper 100K, 1 cm cube
3mm (1/8") shaft w/mtg. hdw $3.75
ALL PARTS PRIME, NO SURPLUS.
MANY OTHER PARTS AVAILABLE. SEND $1.00 FOR
FLYER (WE INCL. WITH ORDER).
$10.00 MIN. ORDER
ONE DAY SHPMT 24 HOUR ORDER
LINE (209) 577-4256 VISAIM.C. OB ELECTRONICS
2131 STONE MODESTO, CA 95351
CIRCLE 42 ON FREE INFORMATION CARD
$16.95
.08% THD at 20 khz,
TIP 36A pnp comp) to above $1.73
VARO 331X 100V 3A FAST RECOVERY rect
MR 751 6A 50V rest 8.83
4700uF/35V filter $1.50
The brightest LED! Stanley SBR 5531
8mcd@20mAdiff 5.55
aOdIess
1.
ILIC1lICS
-
LM3046
RCA 40430
CA3086
MC1438R
1N4148
LM3302
2SC1849
MPS A20
40W/ch 8 ohm Class AB
full power (.2 % Class B)
Slew Rate 33V/uS, low TIM
VI limiting
POWER SUPPLY KIT FOR ABOVE
Includes 125W xfmr, filter caps,
rest, schemo $33.00
Transformer only $27.00 Schemo $1.00
NE541 80V Audio Power Driver $3.80
TIP 31A npn, TIP 32A pnp 60V compl. drivers $.51
TIP 35A npn 25A 60V output $1.65
$789
$1050
$519
!!!
6G
NIi
NEw
H8 (3)
split supply, 125W.
n/a
n/a
®5(3@
..
2.95
n/a
5419
$349
$469
$579
$299
$329
$599
$239
5429
$439
5605
GODBOUT ELECTRONICS
Bldg. 725, Oakland Airport, CA 94614
781-5750
13031
rho SE-OTISAcomplete ail that
contains all the parts to build a
programmable sound effects
generator. Designed around
amend
the new
IChlp,
30576477
Sound
ounTexasd
Chip, the
board provides banks of MINI
DIP switches and pots to
program me variplaa Dem4
j`/° binauons of the SLF Oscillator,
EGO,
Co, One Shot, and
Envelope used Aos. ampleA Op
AmplIC
Amp
R bl ed
a Glement
P n
an Adjustable Pulse GeneraTor, Level Comparator and
f
Multiplex Oscillator for even
more versatility.The 36" x 5"
`'E
PC Board features a prototype
area to allow for user added
circuitry. Easily programmed
e
to duplicate Explosions,
s=
Ptlaeor Gone, steam Trains, or
;e.
almost an infinite number of
other soond. The unit has a
multiple of applications. The
low price includes all parts,
assembly manual, programming charts. and detailed 76477 chip specifications. It runs on a 9V battery (not included). On board 100MW amp
will drive a small speaker directly, or the unit can be connected to your
stereo with incredible results' (Speaker not Included).
'
n/a
S-100
SBC/BLC
S-100 (1)
S-t00 (1)
S-100 (1)
S-100 (2)
H8 (3)
GSE
$3.95
111OLLElf
I
$179
$339
$349
$499
$379
$639
$669
AA,m
TERMS: Cat res add lax Allow 5% for snipping. excess refunded V15Á' /Masternarge' call nur 24 hour order desk al (A151 M2-o6M. COD OK wren street address toi
UPS R,ces goad rnrougn cover month or magst, e
CIRCLE 67 ON FREE INFORMATION CARD
Seucd
$149
5289
$299
$419
$319
5559
$549
Compande wall all bank select systems ICmmemco. Alpha Micro.
i
catalo
5-100
S-180
S-108
S-100
Dig Grp
Dig Grp
Econoram IX -32
Econoram X
Econoram XI
Econoram XIIIA-16
Econoram XIIIA-24
Econoram XIIIA-32
Econoram XIV
Econoram XV -16
Econoram XV -32
Visa, Candzoewcicomed
Send for our free fiant
Imkn
Extended addressing IOU address hnesl single block addressable
Douneal,es
Bank select option for Implementing memory systems greater than 64K
Ill
Horse shoe
Tube
for $1.00 sell
Inc.
Buss S Soles
aae on 4K Doundanes
121
5CIC
27038, DENVER, CO. 80227
'
Econoram VITA -24
Econoram IX -16
Minimum ceder $5.00
Please elude $1,00 for postage
electronics
SS' OI
Econoram IV
Econoram 8II0-16
'EzenMem
MRIMTURE1-3o
ADJUSTABLE
$2.00
CFiANEY
P.O. BOX
ICI'Ixs .
CAPACITOR
Alco Knob
2
24K
32K
16K
16K
32K
PP
I®
"'in
TENCH
IEAAS
717
YOUR
16K
ILAAs
INCrl
OCI
GE Sub -C
Rectifier
2
III
I
Econoram" IIA
Op amps: low noise, 13V/uS (TL074)
(on -off -22 db mute)
Choose from unklt (sockets, bypass caps pre -soldered in place).
1
19
MIMI
II
Bourns 2% Resistor networks
1% Metal film resistors
IIMID
MEMORY!
L° Counting
L° Module
BIFET
corporal.
I nor
$2.49
U Digital
6VDC Xenon
Flasher
American made
Glass epoxy Double sided p.t.h. circuit board
8/$87.208
-I and
19 5.
wILL FIRE YOUR SLAVE STROBE
WHEN YOU TRIGGER Y
MASTER
STROBE.
D1p SO
Assembled & tested $109.15
No additional components necessary
for 12 VDC operation
16K dynamic RAMS. Expand memory in
-II, Exidy, Apple. new PET. Heath H89, etc. Add $3
for 2 dip shunts plus instructions for TRS-80' expansion.
TRS-80'
Kit
WE
Kit
16K DYNAMIC RAMs
LED
19
KR
ProTM
4/.69
5/.89
.15
,16
INVISIBLE
BEAM WORKS LIKE A P6010
ELECTRIC EYE USE UP TB 25 FT APART.
COMPLETE KIT ALL PARTS
8
Pe BOARDS
$21.50
several programming
p
pro rammin examples,
$
extra
NPN HIGH VOLTAGE
`v
2.00
450 VDC
IC = 3A (5A Peak)
HORIZONTAL SECTIONS: HIGH
VOLTAGE REGULATORS
FOR
=
TV
REPLACES: 2N5076, 2N5077, 2N5838, 2N5665,
BDY94, BU126,
2SC2121, 2N5840, 2SC1046,
HOUSE #
2N5466. TIP556 AND MANY OTHgtS.
* NO C.O.D.'s
* SEND CHECK M.O. OR CHARGE CARD NO.
* PHONE ORDERS ACCEPTED ON
VISA AND MASTERCHARGE ONLY.
(214) 278-3553
* ADD
5% FOR SHIPPING
* TX. RES. ADD 5% STATE SALES TAX
* FOREIGN ORDERS ADD 10% (EXCEPT CANADA)
(20% AIRMAIL) U.S. FUNDS ONLY.
C.
atalog
tee
a«aegueat
Toois
ENT,
IPM
Eu
TEST
pIßCIS
AUTOSTh'EO
=MI=
Compact circuit powered
Detects pulses as short as 50
sec
DTUTTUHTL/CMOS
r,)mpatibility
Model01
0
$15795
Reg. S185 95
Sine-, square-.
triangle- and
separate TTL
square wave
output
Model LP-1
LED display
automatic
Model MAX 00
4
Mode
Supplies
Regulated
Short -proof
Fully assembled breadboard
contains four OT -59S sockets.
seven OT -598 bus strips and four
5 -way binding posts
Model 2815
Model PB -2039
Probes included
Soldering
60 Cordless
Iron $2995
WAHL
Weller Xcelité
5800
EDSYN SOLDAPULLT5
Desoldering Tools1595
ModelOS017
HICKOK
Digital CB
In -Line Tester
Reg. $130.00
Measures all
4
transmitter output
characteristics.
Power
Frequency
Modulation
SWR
$65
,
S1695
lG9G
Model WTCPN
Magnifier Lamp
Precisen ground and polisht
magnification lens.$4995
Model MG70A
MINI speakers
MAXI
sound
$7995
57 50
Model CAS -888
$2495
3-Way
Stereo Speakers
Model
HF -9
Long Throw
Die Cast Aluminum
Soft Dome Tweeter
Woofer
Extended Midrange Speaker
50W. 8 ohms
80-20 000 Hz
®.®
-._
a0reo
ste
levels of play
II
I
Model BBC
Reg $59 95
th
7
$7490
58995
RC
.
Circuit Box
15 MHz
Dual Trace
.!u r
r1
d
w
Triggered
Miniscope
I'
wpacito)rs (100 pf to
Model MS -215
'3699554n°
15 MHz Triggered Miniscope
Portable Printer with
Adding Machine Tape
tolOM1t)18
Reg. $49.95
7
mw
CANON Calculator
36 resistors (15 is
0
Portable Oscilloscopes
iirlti ®'
^'4
r-Chess Challenger
Reg. $129.95
Model MS -15
S319 00
Reg
$26995
Model P10 -D
$42.
includes test leads
Model VM520
Miniature High Fidelity
Model CAS -999
Cassette Tape Player with
AM1FM,MPX Radio $
C
$1495
Model
ea.
BP2000-69TR
20 oz ceramic magnet
SPECIALS
Model 388
$1995
3-Way
Speaker
Auto Reverse Cassette Tape
Player with AM/FM/MPX Radio
M40W Pte
Model WR -538A
10 Kr! VAC
BS
Telephone Answering
30 MHz Dual Trace
I
Model WC 4129
CODE-A -PHONE
TELEPHONE
s_
Stereo Power Booster
RCA -VIZ
Multitester
20 Kt/VDC
Model 1827
''-- -
Super Chro-Bar
Portable VOM
Call for Discount Prices
65250
Model C-777
20W per channel
Bass boost
$16995
i
Model LB0-508A with probe
Tape Player with
AM/FM/MPX Radio
111r_
Econo-Lamp
Spring balanced arms
Baked
Tension control knobs
Colors' Red.
enamel finish
Yellow. Blue. Black, Oyster
UL for 60W
White.
Model XL -334A
20
MHz Dual
Trace Oscilloscope
8 -Track
e
Output Soldering`
$4750
Portable
Frequency
Counter
Model LCR-740
Highly accurate 3 digit readout
Operates on one 9V battery or with AC
Measures inductance,
adapter
capacitance. resistance and loss factor.
In -Dash Car Stereos
Weller'Controlled
Service
Master
30 MHz
LCR
Bridge
3-x
Model quickly
t
r
Model LBO -515A with probes
sec to 5 sec built-in delay
Transistorized
Finds faulty components
and easily
Model 99 -SM
Solid state FET oscillator circuitry
300
100 kHz to 100 MHz freq. range
MHz on harmonics
_
g0-
Circuit Tester
Model TC100 ST
Model LSG -16
-
Theennl-Sfzat $2995
Attache
Style
'
Generator
Model 1479P
Call for Discount Prices
'
569e95
-
with Calibrated
Variable Delay
RF Wide Band Signal
5mVicm vertical sensitivity
from 1999 pF to 199.9 µF
0.1% of reading accuracy Auto
over and under range indication
$27995
$14995
leads
DMM
Rise time 11.7 nS or
less
Built-in signal
Flat
delay line
response with smooth
rolloff pas: 30 MHz
9 ranges
Reg47,
Complete with nickel cadmium batteries. AC
charger adapter test
Model 820
í
val
0.1%
Capacitance Meter
5
Simpson 461
.
Dual Trace 5" 30 MHz
Triggered Scope
Reg. $154 95
$12995
Digital !
31/2 -Digit
,
22 Mf i input
resistance
10 Amy
ACDC 1500V Overload
6KV Transient
Protection 2 year
battery life
I
OB
Proto Board with
Built-in Power
$4995
ad
0.5
0 V. DC accuracy
-CD display for high
100µA current
readability
100µV, 100nA. 0.01
range
it resolution Battery life of
Shielded to
over 100 hours
stay accurate in RF fields
Low battery warning
1i
123600
Preassembled Proto
Boards
PB -1 ti
$6950
with LCD Readout
2750
$150-00 $1
taak
1
31/2 -Digit
100 MHz 8 -Digit Counter
20 Hz to 100 MHz range
®
Measures capacitance from
tpF to Farad Resolves to
10 ranges for
0.1pF
4
accuracy and resolution
digit easy -to -read LED display
0.5% accuracy
Function Generator
Rry S69 95
Beckman
TECH 310
eKPNfCIS/ON
Portable Digital
Capacitance Meter uü ,lllr
CON/.111, ,LIAL/FS CORPS.,
Logic Probe
Hickok
LX 303
°aIiV1i,
fromthis
merchandise
t
purchase
$14.95 with $200.00
PDM 35
Sinclair
pEVI CES,
EUP11ON
Tool Set (value
FREE 8 pc.
rDIGITAL MULTIMETERS
,
X-1
Triggered Miniscope
Model MS -230
Reg
5559 00
$47995
Remote Control for
Lights & Appliances
O
DEVICES
MURAPHONE
Cordless
Telephone
System
Reg
Se9 95
$7495
S
855 Conklin
Model 1500
Model 1550
Automatic Dialing
Reg. $399.95
Model 1400
Call Control
Reg. $349.95
$27955 $19995 $24995
GTE
2,_
Flip-Phone
$3795
4
Pc Standard Starter Ku
Two
Pc
a',4
La
J
i21
Co
no Mad
_a
p M
sol.
s7950
L
Ultrasonic Start
K t
o,..
.
i
i
One
I
I) Dniuxe Uitresa-,.
Standard Command
S1450-cn,
S14 50
VISA
a sales tax
CODs, shipping
add appropriate
N.Y. State residents
Tº.
59995
S36. 00
TOLL
Sss.95
FREE
,'''I
N.Y. 11735
Bankprnericard
Master Charge Money Order
COD Check
extra
and insurance
Co,
mo Held Remote Unit
Appliance Unii
s14.50
Farmingdale,
(800)6459518
call (516) 752-0050
In N.Y. State
CFR
.i
10 HOUR TAPE
RECORDER
Associates, Inc.
Newton, N.H. 03858
Top
AC -DC cassette recorder,
to provide 5 continuous
recording and playback of
true fidelity, distortion -free sound on
each side of cassette for a total of
10 hours. Unit has many special builtin features.
TDK
D -C180
cassette
supplied. $155.00'
MILESTONE
PRINTER OFFER!!!
hours
A
used
DIABLO 'HYTYPE' PRINTERS
Featuring:
KSR & Plot Modes
ASCII RS -232C 1/0
110. 115. 300 Baud Input
Dual Pitch (10. 12)
Plotter Capability
Many More Exciting
Features!
These used. cleaned and refurbished Daisy Wheel Terminals
feature the FAMED DIABLO HYTYPE" Daisy Wheel Printer
with its multitude of capabilities. Includes 1/60" horizontal 8 1/48" vertical spacing in the "PLOT" mode.
Limited Offer
F°o s
1500!!
Special Price
WHILE THEY LAST!!!
We also
offer many types of
"Selectric*" Printers,
I
SELECTRIC
O
KSR, RO & More
FOR EXAMPLE
Printer Typewriter: Corresp. code.
15" frame, hvy. duty 735.745 machine & solenoids, etc
& schematics included. Tested 8 operational.
Only $450.00 Price mlodes c,ar,,,Q a s or _ "mO me u S
Data
I
,
'7
M
01 IBM
Cu's
x
mastet chaqa
s
Only
letely Rebuilt
Write or Call for Our Exclusive
(603)382-5179
M.rslercha,ge
O VISA Arc ,;'.
Phono Orders Are W,1,,,,,
May Not Include Shrppin,i .o
,.
-,...:I
when phone is lifted. Stops when you
hang up, making a permanent record.
Easily installed. No monthly charges.
FCC APPROVED
Solid state. Self contained. Excellent
adjustable sensitivity. Voices or other
sounds activate recorder. Uses recorder mike or remote mike. 21/4 x 13/4.
x 3/4" 824.95'
AMAZING ELECTRONIC
MICRO MINI MIKE
world's smallest, solid state,
self contained WIRELESS MIKE. Mercury Bat. furn. Picks up most sounds
and transmits without wires up to 300
ft. thru FM Radio. Tuneable. Use as
mike, ampf., alarm & alert system,
baby sitter, hot line, etc. 2-1/4 x
3/4 x 1/2 $24.95'
FCC Approved
Among
Phone call Adapter $24.50', VOX $24.95', MIKE $24.95'.
(' plus $1.00 ea. postage & handling), 10 hr. Recorder
$155.00' (' plus $4.00 postage & handling). California
residents add tax. Mail Order, VISA, M/C, cod's okay,
quantity discounts available. Money back guar. Free data.
AMC SALES, Dept. 19 9335 Lubec St., Box 928
Downey, CA 90241, Phone (213) 869-8519
CIRCLE 19 ON FREE INFORMATION CARD
CIRCLE 4 ON FREE INFORMATION CARD
Instruments
FLUKE
--
Rugged construction
MIL -T-28800
Hi/Lo power ohms for in -circuit resistance and diode testing
10 Mû input impedance doesn't load circuit
200 hour battery life
low battery indicator
Large LCD readout
2000 counts
year calibration cycle
only 3 adjustments
One -hand operation
The 30 MHz Dual Trace
Oscilloscope with Delay
5mV sensitivity.
Built-in delay line.
Single shot trigger (CH -1, CH -2).
5" P -D -A CRT assures brighter, sharper trace.
20 nSlcm sweep capability plus 11.7 nSec rise time.
OUR PRICE:
1
Oscilloscope Delayed Sweep
Sweep delay, continuously variable from 1 uSec
to 5 Sec.
5 mV/Div. Vertical Sensitivity with x 3% acc.
Rectangular CRT with internal graticule.
14 nSec rise time.
CH -1 or 2 trigger; HF filter; and TV sync.
OUR PRICE:
$1377
Oscilloscope
Front panel X -Y operation.
17.5 nanosec rise time.
Automatic trigger from either channel,
including TV sync.
10 mV
L B050v
OUR PRICE
OUR PRICE:
$751.50
The 20 MHz Single Trace
Outstanding trigger sensitivity over
entire operational range.
10 mV sensitivity and 17.4 nSec rise time.
X5 magnification (x 5%) delivers 100 nSlcm
maximum speed for easy, precise readings.
LIST PRICE: $580
OUR PRICE:
SEND FOR OUR CATALOG
Call TOLL FREE:
Mastercherge
AMPOWER INST, INC.
26 JUST ROAD, FAIRFIELD, N. J. 07006
$522
THE MEASUREMENT SPECIALISTS
"WE SERVICE WHAT WE SELL"
CIRCLE 47 ON FREE INFORMATION CARD
Bankamericard
N.J. CALL:
(8001526-2514 * (201)227-7720
Triggered Oscilloscope
MODEL
LBO -507
$299
31/2
Rugged enough for field or bench
sensitivity.
LIST PRICE: $835
$239
8012A
Add 8 subtract modes (with CH -2 invert).
MODEL
8010A
OUR PRICE
$129
-Digit LCD's - view in any light
Conductance function - resistance to 10,000 Mn
AC measurements to 50 kHz and higher
True RMS for ac accuracy
Touch -Hold probe for tricky places (Option)
Diode test and low power ohms
One year accuracy reduces calibration costs
COMMON floatable to 500V
Recessed jacks reduce shock hazard
Current mode fuse protection to 600V
Voltage mode transient protection to 6 kV
Autozero and autopolarity
AC or dc current to 10 amps with 8010A
Resistance resolution to 0.0010 with 8012A
Built-in batteries and charger (Option -01)
Large
25 MHz Dual Trace,
LIST PRICE: $1530
-
OUR PRICE:
5990
The 20 MHz Dual Trace
NEW
DIGITAL MULTIMETERS
10,000 MO resistance meas with conductance function
Extensive overload and transient protection
OSCILLOSCOPES
LB05t5
$24.56'
VOX VOICE ACTIVATED
CONTROL SWITCH
VISA
ßTest
MODEL
calls
unit connected to your telephone jack
and tape recorder. Starts recording
404-458-4690
lincl
LIST PRICE: $1100
incoming and outgoing
automatically with this all solid state
5151 BUFORD HIGHWAY
ATLANTA, GA 30340
CIRCLE 59 ON FREE INFORMATION CARD
MODEL
Record
DELTRONIKS
028
PERIPHERAL FLYER
of
PHONE RECORDING ADAPTER
®
MON
VIDEOvideoDYTOsEmP
\S,\13'
P,,,,'s
EMM 4200A, 4K Stat'c RAMs, Ceramic
local memory boards manufacturer
closed. We bought the new memory
boards and took these 4200A static RAMs
out. They are tested and 90 -day guaranteed 100% good.
Prime tested 4200A 4K RAMs $5.50 ea.,
32/$160.00, 300 pieces or more $4.50 ea.
2. 16K Dynamic RAMs ... Set of 8 prime
chips, 200nS ceramic. Good for Apple
II, TRS-80, Sorcerer Memory Expansion
$64.95
3. Power SCR's (GEC50A) 100 volts @ 110
amps
$6.95 ea.
4. Squirrel Cage Fans (Howard) $7.00 ea.
5. Power Diode 1N1202A, 200 volt @ 12
amp.
4 for $1.00
6. LM 323 5 Volt 3 amps, voltage regulator
4.95 each or 10/45.00.
7. Super Saver. Micro PD411, Ceramic 4K x
1 dynamic RAMs.
8 for $10.00.
1.
A
DAISY WHEEL TERMINALS
Featuring
quality
modified
FREE
TEST LEADS
WITH EVERY
ORDER
and
COO Accepted
add $3.00 to
cover shipping
handling insurance
N.J. res. add
CALL
TODAY
5% tax.
16 Bit CPU with segmented address space
to 8 Megabytes.
16 Bit CPU with non segmented address
space to 64K bytes.
$1500.00 A complete single board 28000
Z8001
8195.00
Z8002
$150.00
Z80000B
microcomputer system. Contains the
Z8002 microprocessor. 16K words of
dynamic RAM. 2K word monitor PROM.
dual sanal interlaces, four counter/timers
and 32 programmable parallel I/O lines.
All Products Stocked in Depth
Largest Zilog Inventory
Z80 -CPU
Z804 -CPU
Z80-P10
280A -P10
Z80-CTC
Z5OA-CTC
e
MICROPROCESSOR
CHIP SETS
Part No.
Price
Part No.
Price
Pert No.
8080A
8085
$5.95
12.95
6800
6802
$6.95
11.95
6502
6504
6505
8212
8214
8216
8224
8226
8228
8238
2.95
6810
3.95
2.95
6820
3.45
2.25
4.98
4.98
6.95
6850
6852
8251
.65
2'13055
.69
1.50
1.95
1.95
2.50
Price
2 '13442
2 '13771
$9.95
9.95
9.95
2 '13772
2'13773
6520
6522
6532
6551
6.95
9.95
13.95
13.95
L C1060
-
5.0 AMP
5.75
10.95
14.95
9.95
LM307N-8
LM308CH
LM311 N-8
LM324N
LM339N
LM348N-14
LM358N-8
LM555N-8
LM556N-14
LM723CN-14
LM725CN-8
.34
.29
.95
.59
.59
.99
.55
.99
.59
.49
.49
2114L
1.29
.49
.59
.39
1.29
.49
.69
.29
.99
.59
.99
LM741 CN -8
LM747CN-14
LM748CN-8
TBA810DAS
LM1458N-8
LM7488N-14
LM1489N-14
LM3403N-14
LM3900N
LM4136N.14
$29.95
TMS4060.30
4K (4K x 1) 300ns 22 PIN
TMS4060-20
4K (4K x 1) 200ns 22 PIN
Intel version)
1.25
O
x
With data.
"Lowest Price Offered
Anywhere"
$2.49
°
Price
Contacts
Price
8 PIN
14 PIN
.08
.12
.14
.18
.20
22 PIN
24 PIN
28 PIN
40 PIN
.22
.24
.28
.40
20 PIN
w-
450ns
18
4.95
5.50
4.95
4.95
ECL RAM
256
x
Rockwell International
$375.00
As a leaning aid AIM65 gives you an
assembled, tested and warranted R6502
based microcomputer system with a full sized
keyboard, an alphanumeric 20 character
display and uniquely, an alphanumeric
20 column thermal printer. An on board
Advanced Interface Monitor program
provides extensive control and program
development functions. 1K RAM.
$239.00
SYM-1
1
Special
1.95
Bit Fully Decoded 15ns 16 PIN
L.E.D. LAMPS
Based on the 8080f the board has both 1K
RAM and 1K electrically erasable PROM
expandable to 4K x 3 and BK x 8 on board.
Complete with keypad with 25 real keys and
8 bright .500" digits or display.
S Sate&®
14.95
PIN
3341PC FIFO 700 KHz
3341APC FIFO 1 MHz
3342PC 64 Bit Shift Register
3347PC 80 Bit Shift Register
AIM65
$2.29
Contacts
1)
SHIFT REGISTERS
TK80A
assembled, tested, documented and expandable. Powerful 6502 8-tit
microprocessor. 6 -digit hex LED displa/. KIM -1 hardware compatibility.
Single plus 5V power requirements.
F011y
LED209
LED211
LED212
T-1 3 mm Red
LED220
LED222
LED224
T-1'/. 5 mm Red
T-1'/. 5 mm Green
T-1'/. 5 mm Yellow
FND357
FND367
.375" Common Cathode
.360" Common Cathode
(high brightness)
.500" Common Cathode
.500" Common Anode
.500" Common Cathode
(high brightness)
.500- Common Anode
(high bnghtness)
.300" Common Cathode
.300" Common Anode
.630" Common Anode
7-1 3 mm Green
T-1 3 mm Yellow
DISPLAYS
FND500
FND507
FND560
FND567
OL704
DL707
DL747
Texas Instruments
$333.00
TM990/189
UNIVERSITY MODULE
complete learning aid that in conjunction with the Tutorial Text offers
hands on experience with microprocessors. I/O. memory and assembly
language programming. Offers advanced features such as 45 key
alphanumeric keyboard, a powerful instruction set, multiply and divide.
vectored interrupts, single bit I/O manipulation parallel I/O and
7 addressing modes.
A
ILD74
1L074
MCT6
TIL1t1
4N26
4N28
4N29
4N32
Dual Opto Isolator
Quad Opto isolator
Dual Opto Isolator
Opto Coupler
Opto Isolator
Opto Isolator
Opto Isolator
Opto Isolator
1500V
1500V
1500V
t500V
2500V
'
500V
2500V
2500V
P.O. BOX 1035 FRAMINGHAM, MASSACHUSETTS 01701
ive
APElectramc
Sales Corp.
1.09
1.29
1.09
1.09
1.29
1.29
1.29
1.29
2.29
ISOLATORS
Over one million pieces in stock.
18 PIN
4K CMOS RAM
P4315 -45L 4K (4K x
... ..
MICROCOMPUTER BOARDS
Lowest prices anywhere for the
highest quality, an unbeatable combination.
Low Power
10410ADC/HM2106
New small package
16 PIN
1K (256 x 4) 450ns 22 PIN
over 2700 PAGES
NEC MICROCOMPUTERS
$299.00
50
3.95
5101
$6.90
Special $59.95
Low Profile Sockets
5
Single 5V supply
1K CMOS RAM
Complete integrated circuit data selector. Master guide to the latest
I.C.'s including micrqtrocessors and consumer circuits. 45,000
device types listed. E,000 new device types added. Complete rew
section on MPU boa ds 8 Systems.
TEXAS INSTRUMENTS
4.50
0 to 30K BAUD 40 PIN
1680 IC MASTER
Updates
Creates almost any type of sound, from music to
gunshots and explosions. High level op amp
output. 28 pin DIP. Operates from one 9V battery.
3.95
to 40K BAUD 40 PIN
8) 650 ns
._.___....._..............._.................................
JUST RELEASED
2.95
AY3-1015
Free Quarterly
SOUND & MUSIC
GENERATOR I.C.
SN76477N (.600" centers)
SN76477NF (.400" centers)
11(11K
2.25
AY5-1013A
rü»"rr"r'1
...............
2.25
UART's
C2708-65/4708-6
_
0.139
Low Power 4K (1024 x 4) 300 ns
EPROM
LM739CN-14
094
MOS Dynamic RAM's
C2716/TMS2516
15K (2K x 8) 450 ns
LINEAR I.C.'s
LM301 N-8
1.29
$4.95
$24.95
Special of the Month
i
1.19
Low Power 350ns t6 PIN
1) Low Power
High Performance 250ns 16 PIN
2102-1 PC
1K (1K e 1) 450ns 16 PIN
2102-2PC
1K (1K x 1) 650ns 16 PIN
P2111-25
1K (256 x 4) 250ns 18 PIN
P2112-35
1K (256 x 4) 350ns 18 PIN
-ï
$
-
1)
2102LHPC
450 ris
(Single 5V supply
51.95
1K (1K x
15K (2K x 8) 450 ns
(3 power supplies) T.I. Version
9.95
416-5 (300ns)
10.95
416-4 (250ns)
11.95
416-3 (200ns)
Over 200K pieces in stock
Price
2101
1K (256 x 4) 350ns 22 PIN
2102LFPC
TO -220
TMS2716
16K MOS DYNAMIC RAM's (16 PIN)
Part No.
1K (1K x
EPROM'S
C(8
Z80A-SI0/1
Z80-SIO/2
Z80A-S10/2
MOS Static RAM's
TO-3
TO -3
TO-3
TO-3
TO-3
SCR
400V
Z80-510/1
MOS MEMORIES
TO -66
NPN
NPN
NPN
NPN
NPN
NPN
2.5 MHz
Z80-SIO/0
Z80A-S10/0 4.0 MHz
1
Best Quality
60V
70V
160V
50V
100V
160V
.34
I
14 x 8
14.95
8253
8255
8257
8259
Homotaxial
'13054
2
Universal
3.95
3.95
3.95
4.25
3.95
6821
METAL POWER TRANSISTORS
2.5 MHz $26.85
33.80
4.0 MHz
36.00
39.50
36.00
2.5 MHz
39.50
4.0 MHz
36.00
2.5 MHz
4.0 MHz 39.50
190 -DMA
Z804 -DMA
2.5 MHz $ 9.95
4.0 MHz 11.95
7.20
2.5 MHz
4.0 MHz
8.40
7.20
2.5 MHz
8.40
4.0 MHz
Over-the-counter sales,
12 Mercer Rd.. Natick. Mass 01760
Behind Zayres on Rte. 9
Trephone Orders 8 Enquiries (617) 879-0077
IN
MINIMUM ORDER 510.00 ADD 62.00 TO
COVER POSTAGE 8 HANDLING
nuccex
Foreign customers please remit payment on
an international bank draft or international
postal money order in American dollars.
CANADA
5651 FERRIER ST.
MONTREAL. QUEBEC
H4'P 2K5
Tel.: (514) 731-7441
4800 DUFFERIÑ ST.
DOWNSVIEW. ONTARIO
M3H 559
Tel.: (416) 661-1115
BAXTER CENTRE
1050 BAXTER ROAD
OTTAWA. ONTARIO
K2C 3P2
Tel., 1613) 820-9471
CIRCLE 32 ON FREE INFORMATION CARD
www.americanradiohistory.com
3070 KINGSWAY
VANCOUVER. B.C.
V5R 5J7
Tel.: (6041 438-3321
master charge
1.29
3.95
1.29
.69
.59
.59
.69
.69
YOU
Radio -Electronics
ADAPTIVE NOISE
DESERVE
WIRING SYSTFMS
rm
Ammo, me
AC
DAMP S
IY SEID -ON
FR TER
SATELUTE TVRiCFP110N
'
Purl,
POLARITY CHECKER
IM,1-4
PRECISION
mp« w
IT!
GET IT
EVERY MONTH!
Nev FN limer Gruel
2 (ILL
Iv1TertReverie
fRvgmen RMer4 Ae,.seaßr
save on gas!
Come on, treat yourself-and save money, too. Subscribe to Radio -Electronics
today, and
make sure you get all of the most interesting, most exciting and authoritative
electronics
reporting in any magazine, month after month. Don't miss a single one of
the upcoming
issues jam-packed with new-equipment test reports, projects to build, servicing
ideas, and
news of solid state, computers, hi-fi, hobbies and everything electronic. Save
much as $5 off the newsstand price when you subscribe to Radio -Electronics. money, too-as
Come on, you
deserve it-check off the money -saving offer you prefer on the handy coupon,
and start
enjoying Radio -Electronics every month.
Get The
Authority-Every Month
Enjoy the benefits of 20% better gas
mileage, quicker starting, elimination of
tune-ups, reduced pollution, and 50,000
miles on plugs and points.
Update your car with a TIGER solid
state electronic ignition system. Easily
installed in 30 minutes
even on
4000
new cars.
Name (Please print)
Tiger 500 CD
Assembled
Simplikit
Address
City
State
Indicate the offer you prefer:
Zip Code
Postpaid USA.
Master Charge & BankAmericard accepted.
Payment enclosed (send one extra issue)
Year -12 issues ONLY $13.00
(You save $2.00 off newsstand price.)
Bill me
Years 24 i
ONLY $25.00
(Save More! $5.00 off newsstand price.)
Check here If you are extending or renewing your
1
2
$49.95
$29.95
w+
iW
Star
subscription.
Corporation
Phone (303) 243-5200
Extra Shipping: Canada $3.00 per year, all other countries $5.00 per year.
P.O. Box 1727
Mail to: Radio -Electronics
Grand Junction, Colorado 81501
SUBSCRIPTION DEPT., P.O. BOX 2520 BOULDER, COLO. 80322
CIRCLE 36 ON FREE INFORMATION CARD
ALARM CLOCK KITS:
4
We bought 350,000 LED's.
And you get the savings.
Reds, greens, yellows, orange, small, medium, large.
Bags of 25- mixed $2.75. That's only 110 each. Compare
this bargain up to twice our price.
Digit .5"
Here it is! The first of several quality kits we have been asked
for: Here is what you get
unbelievable as it may sound...
1
National - 5375AA Clock Chip
Bowmar Clock Stick Readout (L.E.D.) 4 digit - 1/2"
1
-
13
2
2
1
4
1
2
29
1
1
Transitors
Push Buttons for time set
Toggle Switches for alarm
Filter cap
1N4000 series diodes
1N4148
Disc caps
Resistors
NEW`.
$9.99
P.C. Board
$2.25
Transducer (Speaker) for Alarm
Plug In
LED Lamp for alarm indicator
Transformer $1.50
Case $3.50
D.C. MODEL
Same as above except it includes 60 Hz timebase.
This Kit Includes:
National 5375AA Clock Chip
Bowmar Clock Stick Readout - (L.E.D.) 4 digit - 1/2"
FACTORY PRIME
596 ea. or 10 for $5
BI - Polar LED
LAB -BENCH VARIABLE POWER SUPPLY KIT
to 20 VDC at 1 AMP. Short circuit protected by current
limit. Uses IC regulator and 10 AMP Power Darlington. Very
good regulation and low ripple. Kit includes PC Board, all
parts, large heatsink and shielded transformer. 50 MV. TYP.
Regulation. $15.99 KIT
5
SonalertK on P.C. Board
Direct from a radar detector manufacturer! 4-741 on a board
- plus 12 capacitors, trim pot and many usable components
plus a Mallory Sonalert® - well worth the price of the board
alone - while they last - $2.50 ea.
MICRO MINI
TOGGLE SWITCHES
6 for $5 with hardware.
1
2
2
27
1
1
Transistors
Push Buttons for time set
Disc caps
Resistors
MOV
60 Hz time base
P.C. Board
C( -1000C
$2.25
VERY LIMITED STOCK!
II
"MAGAZINE SPECIAL"
-8/$79.50
Digital Research: Parts
oaoEa
KtT
EACH
16K DYNAMIC RAM CHIP
WORKS IN TRS-80 OR APPLE
1
12
99e
$12.75
Case $3.50
(OF TEXAS)
P.O. BOX 401247B GARLAND, TEXAS 75040
(214) 271-2461
TERMS: Add 50e postage. we pay balance. Orders under $15 add 75e handling
No C.O.D. We accept Visa. MasterCharge and American Express cards. Tex
Res. add 5% Tax. Foreign orders (except Canada) add 20% PBH. 90 Day Money
Back Guarantee on all items. Write for our free catalog full of many useful
bargains.
www.americanradiohistory.com
Low Cost... High Performance
600 mHz COUNTER
DIGITAL MULTIMETER
,.s`
,sm:m*13fr
sema
Se.%
$99-95WIRED
the DM -700. Unlike some of the
Low cost, high performance, that's
-700 offers professional quality
DM
the
available,
hobby grade DMMs
hobbyist price. it features 26
a
at
appearance
performance and
in a convenient, easy to
arranged
all
functions,
5
different ranges and
on a large 31/2 digit, 1/2 inch
displayed
are
use format. Measurements
decimal placement, automatic
high LED display, with automatic
You can depend upon the
indication.
polarity, and overrange
such as a precision laser
components
DM -700, state-of-the-art
er
a nd
s
band gap
semiconductor
trimmed resistor array,
for years to
performance
lab
quality
insure
reliable LSI circuitry
accuracy is 0.1%, and you can
come. Basic DC volts and ohms
from
100
µv to 1000 volts, current
from
way
measure voltage all the
to 20 megohms.
ohms
0.1
from
resistance
0.1 µa to 2.0 amps and
1250
in the design of the 7M-700,
Overload protection is inherent
is
it virtually goof proof. Power
making
ranges,
all
on
volts, AC or DC
DM -700 potable, and, as
the
making
cells,
size
'C'
supplied by four
AC adapter are available. The
options, a nicad battery pack and
black, rugged ABS case with
jet
handsome,
a
DM -700 features
by
All factory wired units are covered
bail.
tilt
retractable
convenient
kits have a 90 day parts warranty.
and
warranty
limited
year
a one
10 days, and if you're not satisifed
Order a DM -700, examine it for
form for a prompt refund.
original
in
it
return
way,
in every
The CT -70 breaks the Farrier on lab quality frequency counters
No longer do you have tle for a kit, half -kit or poor performance,
the CT -70 is complete.ed and tested, features professional
quality construction ano ications, plus is covered by,.
one year
warranty. Power for the is provided by four 'AA' size batteries
or 12 volts, AC or DC, av', as options are a nicad battery
and AC adapter. Three sble frequency ranges, each with its
own pre-amp, enable you accurate measurements from
less
than 10 Hz to greater thañ Hz. All switches are convenient)
locate( on the front panel of operation, and a single inputY
jack eliminates the need de cables as different ranges
are
selected. Accurate readinge
1.ured by the use of a large 0.4 inch
seven digit LED dis la a
CXO time base and a handy LED
gate light indicatory y
The CT -70 is the answer dur measurement needs,
in the
field, in the lab, or in the ham ider yours today, examine it for
mpletlied,
return the unit fora prompt
and cou rteou' e not c
,
Specifications
Frequency range:
Sensitivity:
Stability:
Specifications
DC and AC volts:
DC and AC current:
Resistance:
Input protection:
Input impedance:
Display.
Accuracy:
Power:
Size:
Weight:
Display:
Input protection:
Input impedance:
100 µV to 1000 Volts, 5 ranges
0.1 µA to 2.0 Amps, 5 ranges
ranges
0.111 to 20 megohms, 6
protected
1250 volts AC/DC all ranges fuse
for overcurrent
10 megohms, DC/AC volts
31/2 digits, 0.5 inch LED
0.1 % basic DC volts
4'C' cells, optional nicad pack,
6"W x 3"H x 6"D
2 lbs with batteries
b AC
adapter
Prices
$99.95
79.95
4.95
16.95
3.95
DM -700 wired + tested
DM -700 kit form
AC adapter/charger
Nicad battery pack
Probe kit
15%. NYeresidents, add
Power:
Gate:
Decimal point:
Size:
Weight:
10 Hz to o
less than
250
less than 1'° mHz
mHz
1.0 ppm, 2r
05 ppm/ °C TCXO crystal
time base
7 digits, LEI
height
50 VAC to
VAC to 600 mHz
1
H ranges
ran 9 s 50 ohms,
Hz raniz
mHz
4 'AA' cells,
0.1 sec and
Automatic, alt gate light
I
5"Wx1Y"H.
1
lb with batte
Prices
CT -70 wired + tested
AC adapter
Nicad pack with AC adapter/charg
Telescopic whip antenna, BNC plug
Tilt ball assembly
CT -70 Kit Form
ramsaU
PHONE ORDEI
(7161 271-6
add
CIRCLE
6 ON FREE
INFORMATION CARD
$99.95
9.95
14.95
7.7.95
75.95
3IE11j35
BOX 4072, ROCHESÌ 610
Satisfaction guaranteed
a SÓ Minrefunded COD,
under
imum order 56.00. Orders
$10.00, add $.75. Add 5% for postage
TERMS:
Overseas,
WIRED
COMPARE THESE PRICES!
ADVERTISING INDEX
OPULA
RADIO -ELECTRONICS does not assume
any responsibility for errors that may
appear in the index below.
COMPONENTS INC.
Free Information Number
MONEY SAVING DISCOUNT PRICES
HARD
ATV
PTS Electronics
98
25
Pac-Com
Poly Paks
32
Active Electronics
99
24
Popular Components
31,33,62-63
45
QB Electronics
85
14
Quest
90
9
/Wanted Computer Products
ALL COMPONENTS GUARANTEED
47
Ampower
TO BE FACTORY PERFECT
52
B&K Precision Dynascan Corp.
Karel Bartle
(MONEY BACK GUARANTEE)
520
Repertory Duner
C-NOS Generator
...
GENERATOR/ENCODERS
R0-3-2513
AY-5-2376
AY -5-3600
8.80
12.10
Character Generator (upper or lower case)
Keyboard Encoder.
Keyboard Encoder
UP08085AC
P08035
UPDB155C
UPB8212C
UP90214C
UPB8216C
UPB8224C
UP88226C
UPB8228C
UPB8238C
UPD8243C
UPD8251C
U
UPOBT53C
UP0B255C
UPDB257C
UPD82S9C
Microprocessor
Single Chip 8 -Bit N -Channel Microprocessor
84
ble
-Channel
Controller...
.
_...._. _._..__.
8080/Z80 Bus Versen of FD1791
75
19
Detroniks
Digi-Key
-
Edmund Scientific
25
Electronic Measurements
80
94
Formula International
42
Der
5
40
=
/E WELCOME
WITH EACfUFACTURERS,
2H 15, 1980)
INC.
POPULA`AN RD.
1145 W/¡ RE30
P.O. B01747
MELVII
RMATION CARD
VIZ Mfg. Co
22
Wersi Electronics
65
97
92-93
Godbout Electronics
96
Don't miss
a
single copy of
Radio -Elec-
Hustler, Inc
76
ICS Electronics School
81
Information Unlimited
International Crystal Mfg. Co.
International Electronics
82
74
88
JS&A
1
26-27
Jameco Electronics
21
Jan Crystal
86-87
MCM Audio, Inc.
33
Meshna
National Radio Institute
Div. of McGraw-Hill
Nesda
43
Netronics
ATTACH
LABEL
HERE
Your old address and zip
code
Your new address and zip
code
82
83
88
(NRI)-
National Technical Schools
16
Give
us:
80
Lakeside Industries
53
74
MOVING?
66
5
67
7
tice
(PRICES GOOD
Order Today frcJENTS
58
94
FREE INOUIRIE§iSTITUTIONS.
DISTRIBI ORDER $10.00.
NO C.0.1
82
Vero
Hobby World
51
79
USI Corp.
61
56
-
27
90
100
Six weeks' no-
Switching Regulator ConveCe
8 quantity.
TO ORDER: Specify part numb'Add $1.75 for
7%
accdd
sales tax.
must
order
Check or money
postage 8 handling. New York Stälollars by inter Add
mrk.
20% for
Payment
Foreign Customers:
national postal money order or
handling.
shipping 8
Tri-Star
75
24 50
-
36
15
63
Asynchronous/Synchronous
.
Tek-EI Corp
tronics.
245
...
TAB Books
Grantham College of Engineering
80
Heath
Cot,. 3,73
Hickok Electrical Instruments
17
Hitachi-Denshi
69,23
Complex Sound Generator
3
8
84
100
Fordham Radio Supply
...
SOUND GENERATOR
CIRCLE 24
Digital Research (corporation
38-39
..
23
Surplus Center
95
Fluke
38.90
GIFT
100
Electronic Supermarket
80
BR1949
C2716.T7492516 UV Prom
SG3524N1J
95
P
15.50
Dual Baud Rate Generator
PROM
82
15 50
BAUD RATE GENERATORS
LINEAR
4
Sprague Products
30
Delta Electronics
88
81
Texas Instruments
84
7
85
-
90
Coy. 2
4.35
.
Dual Baud Rate Generator
13
Creative Computing
77
Solid State Sales
17
84
35
75
e.
1
COM1671
Continental Specialties
49
3.50
11
77
Spacecoast Research
18-21
Concord-Computer Components
2 75
2114ÚC8.
ASTRO
60
2
.
S576477
55
95
J
30
26
18
28
78,79
28-29
Schober Organ
96
54
65,70
91
101
Rye Industries
48
98
Computer Professionals' Book Club
3
-Channel Mi cropiocecsso5-280
Static MOS RAM (I
UPD2102ALC-4 1024 Bit Fully Decoded MOS RAM with st
Static
UPD2101ALC-4 1024 Bit (25604)
VO (low power)
MOS RAM with r
Static
UPD2111ALC-4 1024 Bit (25654)
power)
4K Static RAM 450risow
4K x Bit Static RAM ..
UPD2147D
4K x 1 Bit NMOS RAM
UPD4104C
RAM
1024 Bit (25651) Static CMOS
UPD5101C-E
4K Dynamic RAM
UPD411AC
16K(16384011Bit Dynamic MOS MA
UPD416C
11.
3
Ramsey Electronics
Sheldahl
Command Productions
18.r
35
RAMS
COM5016
7f
t8.9
9.95
SinglelDouble Density Floppy Disk Controller 9.95
Single Density floppy Disk Controller
com1O9955
Duel Density Floppy Disk Controller (IBM
CRT
Channellock
6
81
Dage Scientific
CONTROLLER CHIPS
F0179113
CRT5027
F017938
96
Electronics
Prop. Interval Timer
Prag. Peripheral Interlace
Prag. OMA Controller
Prop. Interrupt Controller
MICROPROCESSOR CHIPS
ÚP0765
FD1771B
29
Radio Shack
40
CIE-Cleveland Institute of
..
Prog. Communication Interlace
N
Chaney Electronics
16,24-25
34
Sabtronics
12
Single Chip 8 -Bit Microcomputer
Timer
2048 Bit Static MOS RAM with I/O Ports 8
8-Bit 1,0 Port
Priority Interrupt Controller
Bus
Driver
Bidirectional
4 -Bit Parallel
Processor
Clock Generator 8 Driver for 8080A
4 -Bit Parallel Bidirectional Bus Driver
Controller & Bus Driver
stem Controller 8 Bus Dover
880088006 System
VO Expander for Single Chip 8 -Bit Mcrocomputer
8-Bit
67
5 85
8-Bit N -Channel
UPD77000C-1(BZBOA18-Bit N
CFR Associates
12%
8080/8035/8085 SUPPORT CHIPS
UPD8080AFC
25
4
..
59
5
61
Burdex Security
13 95
13 95
Push Button Telephone Dialler Circuit
AY -5-9100
AY -5-9200
AY -5-9500
75
96
89
Dir
34
Bullet Electronics
90
94
102
RCA Corp.
98
Beckman
73
RCA-Distributor & Special Products
Coy. 4
54 20
6
74
65
Panavise
American Antenna
TELECOMMUNICATIONS
22
80
44
2
AY-3-1015D
AY-3-1014A
PAIA
57
All Electronics
TR1602B
46
76
15
37
3
Optoelectronics
82
31
AY-5-10130
41
84
AP predicts, Inc
Adance Electronics
UARTS
onComputing
62
TO GET COMPONENTS
TOP SELECTION OF FIRST QUALITY
POPULAR COMPONENTS
68
64
Research
2,72,78
Olson Electronics
Page
AMC Sales
4
13,11.12 O.K. Machine &
Tool
name
(please print)
address
8-11
68-71
90
32
city
state
zip code
Mall to: Radio -Electronics
SUBSCRIPTION DEPT., P.O. BOX
2520,
BOULDER, COLO. 80322
clearly readable printouts
clearly remarkable price
The $625* Heathkit H14 PrintecYoú II pay hundreds
'
atures.
more for a printer
Where else can you buy a microprocessor based printer with the H14's features and
copy quality for under a thousand dollars?
The Heathkit H14 prints up to 165 charac-
ters per second, one full line every two
seconds.
5
x 7 dot matrix and finest quality impact
printhead give you clear, easy -to -read
images.
All functions are microprocessor -controlled for reliable performance and more
efficient use of your computer.
Selectable baud rates from 110 to 4800.
Convenience of standard fan -fold paper,
2.5 to 9.5 inches wide.
Chrome wire rack keeps paper neat.
You get:
Standard 96 -character ASCII set-UPPER
and lower case.
Operator or software selectable line
width: 132, 96 and 80 characters per
line.
Compatibility with any computer,having
RS -232C or 20 MA current loop serial
interface with handshaking.
Sprocket paper feed, with adjustable
spacing, keeps paper moving smoothly.
"Paper out" and "paper jammed" signals prevent loss of data.
Price includes connecting cables, paper
rack and ribbon. Just add paper and you're
ready to run. And service on the H14 is
close by at any of 55 Heathkit Electronic
Centers throughout the U.S.
Complete details on the remarkable H14
are in the newest, free Heathkit Catalog.
Send for yours today or pick one up at your
Heathkit Electronic Center.
"Whatever
your
printer is
an
this
..an excelle excellecomputer,
complement
COn1co
lue."
- Creativevant
Computing
nt
Magazine
Ii"
la.,,C
WOE
owe
See the complete line of
FREE CATALOG Heathkit Computer Products,
including printers, video terminals, floppy disk sys-
tems and software, in the new, 104 -page Heathkit Catalog. It describes nearly 400 exciting kits for your
TOP
son,
.10
KVrfm
M
i16W
-
home, work or pleasure all at build -it -yourself savings. Send for yours today or pick one up at your
Heathkit Electronic Centert where Heathkit Products
are displayed, sold and serviced. See your white pages
for center nearest you.
Benton Harbor, MI. Prices are subject to change without notice.
`In kit form, F.O.B. Benton Harbor, MI. Also available completely assembled at $895 F.O.B.
Corporation
Electronics
[Units of Veritechnology
Heathkit
Heath Company, Dept. 020-634, Benton Harbor, MI 49022
CIRCLE 69 ON FREE INFORMATION CARD
CP-18©
....SPECIFICALLY
ENGINEERED TO TAKE
OVER THE FIBERGLASS
ANTENNA MARKET!!
Cidk,
sr9.5
BUYS THE
MouNt
,
6 YEAR
GUARANTEE AGAINST CHIPPING, PEELING,
CRACKING, CRAZES, RUST ANYTHING !!!
if IT
ZIT
MOUNTS
THROUGH THE
MOUNTS
ALL
TRUNK
ON
FACTOR
PATENTED
ROOF
TUNING
SLEEVE
LIPS
3
FREYIDIUM
-_ >,
-
IT
MOUNTS
ANYWHERE!
CONE
4THE
MOUNTS
WITH A
QUARTER TURN.
...Sold exclusively by
..
-`'
"`
o_::
1il...l.
__
MIL-SPE
PO LY-
OLEFIN
SHEATH
x..
^
e`
TUNED
MATCHIN
COIL
THE WHIP
SCREWS
INTO THE
TOP OF
THE CONE.
American
METAL
MAGNET
WIRE
TUNED
LOADING
COIL
K40
/60 Sn Pb
SOLDERED
CONNECTION
i
MIL -SPEC
CHROME
PLATING
4.
Dealers throughout the U.S.
(1
Canada.
AMERICAN ANTENNA
ELGIN, ILLINOIS 60120
COPYRIGHT AMERICAN ANTENNA
Download PDF
Similar pages