ALL ABOíüAE`S - American Radio History

ALL ABOíüAE`S - American Radio History
HI -FI
EST REPORT
ALL ABOíüAE'S
Special 4 -Part Story
NEW COLOR TV CAMERA
Now You Can Make Your Own
COSMOS
ALARM CIRCUITS
Stop Burglars Fast
OPERATIONAL
AMPLIFIER IC's
See How They Work
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rvice Clinic
ew High -Fidelity Gear
Troubles i oting Charts
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ELECTRONICS, INC
HOME OFFICE- INDIANA:
5233 S. HWY. 37
BLOOMINGTON, IN 47401
TEL 812, 8249331
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TEL 205, 323.2657
ARIZONA:
2412 W. INDIAN SCHOOL
PHOENIX, ARZ 85061
TEL. 602, 279 -8718
CALIFORNIA-NORTH:
RD
Precision Tuner Servic
4611 AUBURN BLVD.
SACRAMENTO, CA 95841
TEL
is proud to announce the GRAND OPENING
of our new Service Centers in
916, 482-6220
CALIFORNIA-SOUTH:
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TEL 714, 2801010
COLORADO:
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1
YEAR GUARANTEE
Come and see us. PTS Branches are all company owned -No Franchises-we care for
our customers. For a TUNER PART or COMPLETE TUNER REBUILT, come to us, we
will take care of your tuner problems like no one else can. WE'RE PROFESSIONALS
18 years experience made us what we are!
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CLEVELAND, OH 44134
TEL 216,845-4480
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OKLAHOMA:
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PTS will repair any Tuner
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PTS uses only ORIGINAL PARTS! No home -made or
make -do, inferior merchandise. (this is why we charge
extra for major parts!) You get your tuner back in
Original Equipment condition.
Color Black & White Transistor
Varactor Detent UHF
Tubes
All Makes
VHF or UHF
UV-Comb.
$10.95
$17.95
Major parts and shipping
charged at cost.
(Dealer net!)
PTS ELECTRONICS, INC. is recommended by more TV manufacturers and
overhauls more tuners than all other tuner services combined!
dJ Ill 4J2
AND STILL TRYING HARDER!
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(NOT A FRANCHISE COMPANY)
The test set
by which to ,judge
all tv sets.
New RC<, ICTJ,
Mode, 10J106
INTRODUCING THE ALL -NEW
RCA
Industry Compatible Test Jig
Here's a test jig engineered for use with virtually all television receivers: the RCA 10J106.
To assist your servicing efforts, not only will it judge the performance of practically
every RCA color chassis built in the last decade
tube type, hybrid or solid state
but readily available pin connection adapters permit testing of almost every
other leading TV chassis. RCA's 10J106 is destined to become the standard of the
service industry.
Check these features:
A 19" picture tube with 33 KV capability.
Accessories included for RCA sets: two 4 -ft. cables for
kines and yokes; molex to octal adapter; special yoke
A simple 2- switch system for matching yoke impedadapter; two convergence loads for RCA chassis; high
ances. No additional transformers to buy or plug in.
voltage lead; ground lead; audio cable and
A built -in high voltage meter calibrated to 35 KV, redspeaker; high voltage extension cable; continuall-'lined at 33 KV for safety. Built -in static convergence, and
updated Cross Reference Handbook; set -up and
built -in matching transformer for 9 different horizontal
instruction manuals.
deflection
-
-
outputs.
vertical matching transformer matches virtually
all TV chassis.
Lightweight, portable cabinet with convenient handle.
5 -step
Call your RCA Distributor. He's waiting to hear from
you. Or contact RCA Distributor and Special Products
Division, Cherry Hill Offices, Camden, N.J. 08101.
RCADistributor and
Special Products Division
(7rvde
I I
on reader
crrri'e an!
<
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g
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0
Our big new 1975 edition is now off the press. It cross -references
106,000 part numbers -more than any other guide in the business.
Pick up a copy today at the Sylvania distributor where you get
We're helping you make it.
Sylvania ECG' Semiconductors.
013 SYLVAN IA
2
www.americanradiohistory.com
looking ahead
Calculators' future
Worldwide calculator production totaled about 34 million units in 1974 and it will
rise to more than 92 million in
1978, according to forecasts
by Coleman & Co., a New
York broker. Coleman predicts that the average factory
price of all calculators will
decline by 1978 from today's
$36.56 to $22.39. Hand -held
consumer calculators now
average $26.12 at the factory
and will drop to $11.40 in the
same period.
L. J. Sevin, president of
Mostek, a calculator manufacturing firm, warned American manufacturers that the
calculator could go the way
the
of the transistor radio
Far East. Before the end of
this year, he said, Oriental
assemblers may be able to
put together six -digit calculators for considerably under
-to
five dollars. He gave this
breakdown of costs: Vacuum fluorescent display, 90X; 4function chip, $1.30; keyboard, 60e; battery 8G; case,
20e; labor 13c packaging and
instructions, 16e.
;
Electronic journalism
few short months, television news coverage has
been revolutionized by ENG.
ENG means "electronic news
gathering" and it was the hottest topic at the recent convention of the National Association of Broadcasters. In
seminars and at the equipment exhibitions, it became
obvious that the entire TV
In a
broadcasting industry
is
changing over from film to
ENG for on- the -spot news
coverage. ENG owes its existence to a little black box
called the time base corrector
-that converts the output of
a portable video tape recorder to a broadcast -quality
signal.
In its simplest terms, ENG
replaces news film with tape.
Portable color cameras, some
-
of them weighing no more
than a 16 -mm film camera,
are used to feed portable battery- operated VTRs, such as
the Sony U -Matic or the Akai
1/4 -inch recorder. The tape is
rushed back to the studio
where it is electronically ed-
ited- generally
using two
special videocassette editing
recorders. The output of the
edited tape is fed through the
time base corrector into a
standard two-inch broadcast
VTR for airing. Broadcasters
using ENG cite these advantages: Speed -electronic editing plus elimination of the
need for processing makes it
possible to cover later stories
on newscasts. More coverage
-because
ENG
requires
smaller crews than film, extra
news teams can be used with
the same staff. Economy
tape can be used over and
over.
-
Sony home VTR
introduced
videocassette recorder
Sony has
for about $760 in Japan.
Since the deck doesn't put
out an RF signal, it must be
attached internally to older
sets, at a charge of about
$100. The U.S. version of the
color TV -VTR console is expected to include a 19 -inch
set, in keeping with American
tastes for larger screens.
Sony says it is producing
5,000 decks and 2,000 TV -VTR
consoles monthly.
The new recorder provides
the highest density of video
right signals are transmitted
slightly above and below the
assigned station frequency.
A radio tuned to the station's
exact frequency receives a
composite left- plus -right ;ignal. To receive stereo programming, two radios can be
used -each tuned to the
proper sideband.
information storage yet
ABC has completed hosts
of circular polarization of TV
signals in Chicago and is s sking the FCC to approve 'his
transmission system as an
option for broadcasters. According to RCA, which is
backing ABC's petition to the
FCC, circular polarization an
"virtually eliminate ghostir g."
This is because a sic nal
which is polarized in a cic ck-
achieved on magnetic tape.
A total of 20.6 square feet of
tape is required for an hour's
recording. This compares with
70.3 square feet an hour for
the 3/4 -inch Sony U- Matic,
56.2 square feet for RCA's
proposed home videocassette
recorder and 93.8 square feet
for the standard Japanese
cartridge or open -reel video
tape recorder.
AM stereo
in
pocket -sized cassette that
costs only $15. A 30- minute
cassette will sell for $10.
Sony says the tape economy is the result of a new recording head with an extremely narrow gap and a
new high=density tape formulation. In Japan, a console
containing the record -player,
a clock -timer and a 17 -inch
Trinitron color set sells for
about $1,500. Future Sony
color sets will have built -in
VTR jacks to accommodate a
videocassette deck that sells
Why not put stereo on AM,
too? This idea has cropped
up from time to time, but
never got very far. Now RCA
has asked the EIA to set up a
special study committee and
has submitted its own proposed system. The RCA system uses a multiplexed L -R
signal, frequency modulated.
RCA says broadcasters who
also have FM stereo outlets
can use the same multiplex
equipment to provide stereo
AM and FM simultaneously.
Regular AM receivers would
still pick up a monophonic
signal. To reproduce AM
stereo signals, a special IC
discriminator chip would be
required in the receiver.
Channel separation of 25 dB
is claimed.
Two stations actually are
broadcasting in AM stereo
but using a different system.
Station XETRA in Tijuana,
Mexico, has been putting out
AM stereo since 1970, and
WFBR in Baltimore is currently experimenting with it.
Both are using a sideband
system, in which the left and
4
www.americanradiohistory.com
Ghostless TV?
wise direction becomes a
counterclockwise signal after
it is reflected from an obstruction. This counterclockwise signal would be invis ble
to a special antenna desig "ed
a
Japan designed specifically
for home use, and plans to
market a similar unit in the
United States this fall. Unlike
Sony's industrial U -Matic VTR
which uses 3/4" wide tape, the
new "Betamax" home device
employs 1/2 -inch tape. The
most striking feature of the
new home system is its extreme economy of tape. The
helical -scan recorder moves
the tape along at a lazy 1.57
IPS, making it possible to record a full hour of video on
about 494 feet of tape in a
.
-
for clockwise polarization.
The immediate bene iciaries of circular polariza ron
would be viewers depenc ent
on rabbit -ear antennas for reception. The new polariza on
method would give them more
opportunity to eliminate
ghosts by positioning the dipoles. For others, there a
catch. Although circular polarization won't harm rec eption by outdoor antennas it
won't improve it either. For
ghost -free reception, a new
antenna would be requi 'ed.
For broadcasters, too, 'he
new system has a price In
addition to erecting a new
transmitting antenna, an additional transmitter and a new
tower will often be requi .ed.
No wonder RCA is interes'ed
sees circular polarization
creating a $35 to $50 -mil ion
market in new transmitting
and receiving equipment.
>
-it
by DAVID LACHENBRUCH
CONTRIBUTING ED 1 JR
Radio-Electronics®
THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS
More than 65 years of electronics publishing
BUILD ONE
OF THESE
HI -FI
29
JULY 1975
Color TV Camera Costs About $400
Try this 2 -color system that produces lifelike results.
It's an experimenter's dream. by Gary Davis
48
Digital Memory For Your Scope
Part Il: Final construction details include printed- circuit
board patterns and parts placement diagrams. by Chris
Titus
50
COSMOS IC Burglar Alarm Circuits
Part Ill: More alarm circuits that really work plus useful
data on how to use them effectively. by R. M. Marston
32
Tests The Sansui QRX -6001
First of a series of lab test reports that tell the true
facts about new hi -fi gear. Exclusive to Radio -Electronics.
by Len Feldman
45
Make PA Work!
How to solve the problems of setting up a PA system so
it can really do its job. by David Yoshinari
GENERAL
ELECTRONICS
4
TEST
EQUIPMENT
16
10 -4510
dual -trace oscilloscope kit.
Equipment Report
ACS Mark function generator
Equipment Report
Hickok model 270 function generator
35
Test Equipment For Industrial Servicing
A detailed look at what's available today. The story includes both new and old equipment. by Jack Darr
53
All About Oscilloscopes
Part II: Wrapup on what scope specifications really
mean. Find out how much you know. by Charles Gilmore
42
All About IC Operational Amplifiers
Part Il: See how op -amps work and how you can put
them to use. by Don Lancaster
R -E's
Replacement Guide for Japanese Transistors
Part XXVIII: More listings in our growing directory.
compiled by Elizabeth and Robert F. Scott
60
Step -By -Step Troubleshooting Charts
What to do when a set has been damaged by lightning.
by Stan Prentiss
65
Service Clinic
More on HEW hold -down circuits in solid -state receivers.
by Jack Darr
98
14
6
10%
0%
Advertising Index
Letters
84
New Literature
70
New Products
New & Timely
85
Next Month
101
tiR
TIME
Equipment Report
25
87
90%
Looking Ahead
Tomorrow's news today. by David Lachenbruch
I
DEPARTMENTS
If you've always wanted to build
your own color TV camera, here's
your chance. This issue we feature
the first part of a special construction article that tells you how you
can do it now. For full details turn
to page 29.
R -E
Heath model
22
TELEVISION
ON THE COVER
100%
AUDIO
STEREO
SOLID -STATE
ELECTRONICS
Vol. 46 No. 7
Readers Service Card
RISETIME IS JUST ONE important scope
specification. Find out just what it and the
other scope specs mean and what you
should know about them before you buy your
next scope.
See page 53
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6
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a
6
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6 6
6
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6
6 6
ROOao
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sfss11111
PA SYSTEMS AREN'T MAGIC. It just takes
know -how to make them work right, Get
some this month.
See page 45
Radio -Electronics, Published monthly by Gemsback Publications, Inc., 200 Park Avenue South,
New York, NY 10003. Phone: 212 -777 -6400. Second -class postage paid at New York, NY and
additional mailing offices. One -year subscription
rate: U.S.A., U.S. possessions and Canada, $8.75.
Pan- American countries, $10.25. Other countries,
$10.75. Single copies 75c. © 1975 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, Boulder, CO
80302.
A 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.
As a service to readers, Radio -Electronics publishes available plans or information relating to newsworthy products, techniques
scientific and
technological developments. Because of possible variances in the quality and condition of materials and workmanship used by readers,and
Radio -Electronics
disclaims any responsibility for the safe and proper functioning or reader -built projects based upon or from plans or information
published in this magazine.
www.americanradiohistory.com
3
INT ROD SCING
VIßßihIIEJ
ONE YEAR
GUARANTEE
STILL C h'J LY
.,
ALL P1FITS
INCLUDED
WITH CABLES
EXCEPT 1-UBES
AND TRANSISTORS
PROVIDES YOU WITH A COMPLETE SERVIC
FOR ALL YOUR TELEVISION TUNER REQUIRE VIENTS.
VHF OR UHF ANY TYPE
(U.S A. ONLY) $ 9.95
UHF /VHF COMBINATION
(U S.A. ONLY)
$'5.00
IN THIS PRICE ALL PARTS ARE INCLUDED.
Tubes, transistors, diodes, and nuvistors are ch.lrged
extra. This price does not include mutilated tuners.
Fast, efficient service at our conveniently lo:ated
Service Centers.
All tuners are ultrasonically cleaned, repaired,
realigned, and air tested.
A UHF Tuner with
70 channels which are
detented and indicated
just like VHF channels.
A VHF Hi Gain
Solid State Tuner.
AC Powered.
90 Day Warranty.
3A ONLY)
UNIVERSAL REPLACEMENT TUNER $12.95
This price buys you a complete new tuner built specifically by Sarkes Tarzian Inc. for this purpose.
All shafts have a maximum length of 101/2" which
can be cut to 1'2".
Specify heater type parallel and series 450 mil.
or 600 mA.
irr=
Demonstrate the
to
your customers and show improved
reception with their TV sets.
CUSTOMIZE
Customized tuners are available at a cost of only
$15.95. With trade -in $13.95.
(u s A ONLY)
Send in your original tuner for comparison purroses
to any of the centers listed below.
You may place your order through
any of the Centers listed below.
HEADQUARTERS
ARIZONA
CALIFORNIA
TSC
FLORIDA
GEORGIA
ILLINOIS ..
INDIANA
IOWA
KENTUCKY
LOUISIANA
MARYLAND
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NEVADA
NEW JERSEY
OHIO
OREGON
TENNESSEE
TEXAS
WATCH
GROW
US
VIRGINIA
WISCONSIN
CANADA
BLOOMINGTON. INDIANA 47401
TUCSON, ARIZONA 85713
NORTH HOLLYWOOD, CALIF. 91601
BURLINGAME, CALIF. 94010
MODESTO. CALIF. 95351
TAMPA. FLORIDA 33606
FT. LAUDERDALE, FLORIDA 33315
ATLANTA, GEORGIA 30310
CHAMPAIGN, ILLINOIS 61820
CHICAGO, ILLINOIS 60621
SKOKIE. ILLINOIS 80076
HAMMOND. INDIANA 46323
INDIANAPOLIS. INDIANA 46204
WEST DES MOINES, IOWA 50265
LOUISVILLE, KENTUCKY 40208
SHREVEPORT, LOUISIANA 71104
BALTIMORE, MARYLAND 21215
ST. LOUIS, MISSOURI 63132
LAS VEGAS, NEVADA 89102
TRENTON, NEW JERSEY 08638.
JERSEY CITY, NEW JERSEY 07307
CINCINNATI, OHIO 45216
CLEVELAND. OHIO 44109.
PORTLAND, OREGON 97210
GREENEVILLE, TENNESSEE 37743
MEMPHIS, TENNESSEE 38111
DALLAS, TEXAS 75218
NORFOLK, VIRGINIA 23513
MILWAUKEE, WISCONSIN 53216
ST. LAURENT, QUEBEC
CALGARY. ALBERTA
537 South Walnut Street
P.O. Box 4534, 1528 S. 6th Ave
10654 Magnolia Boulevard
1324 Marsten Road
123 Phoenix Avenue
1505 Cypress Street
1045 W. 23rd Street, Bay 16
938 Gordon Street S.W.
405 East University Street
737 West 55th Street
5110 West Brown Street
6833 Grand Avenue
112 West St. Clair Street
822 10th Street
2920 Taylor Boulevard
3025 Highland Avenue
5505 Reisterstown Rd., Box 2624
10530 Page Avenue
1412 Western Avenue No. 1
901
North Olden Avenue
547-49 Tonnele Ave., Hwy.1 &
7450 Vine Street
4525 Pearl Road
1732 N.W. 25th Avenue
1215 Snapps Ferry Road
3158 Barron Avenue
11540 Garland Road
3295 Santos Street
4722 West Fond Du Lac Avenue
9
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
Tel.
334 -0411
60:- 791 -9243
81
:
21 s-
41
769.2720
,347 -5728
20,-521-8051
81
253-0324
3GE- 524.0914
40...758-2232
21 .356 -6400
31:.873- 5556 -7
31: 675 -0230
21! 845 -2676
31
632 -3493
51
-277 -0155
50:- 634 -3334
31i 221 -3027
30' 358 -1186
31: -429 -0633
70; 384 -4235
605 393 -0999
201 792-3730
51 :-821 -5080
21E 741 -2314
502 222 -9059
61e 639-8451
901.458 -2355
214- 327-8413
804-855-2518
41, 871 -7655
IF YOU WANT TO BRANCH OUT INTO THE TV TUNER REPAIR BUSINESS.
WRITE TO THE BLOOMINGTON HEADQUARTERS ABOUT A FRANCHISE.
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3 on
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www.americanradiohistory.com
5
new & timely
Citizens banders comment on
proposed FCC regulation changes
REACT (Radio Emergency Associated
Citizens Teams), the national organization of Citizens banders that organized
to help motorists and others, commented in general favorably on the proposed
revisions of the FCC Citizens band regulations. Among the REACTions were:
Expansion of the Class -D band: Increasing the number of channels, as
proposed, is favored. But REACT opposes the elimination of straight AM
in the Class -D service. Further, it suggests that expansion of the Class -D
band should not be substituted for action to establish a new Class -E service
in the 225 -MHz region. REACT also
advocates that all channels be open to
both Inter -station and intra- station calls.
Single sideband: Retain the current
23 Class -D channels with both AM and
SSB options. Divide the new channels
equitably between AM and SSB -only
operation, creating a basis for evaluating SSB -only operation.
Emergency channel: Limit emergency
channel -9 to AM, to assure maximum
participation in monitoring. Permit, on
the emergency channels, communications necessary to maintain voluntary
monitoring on those channels.
(An SSB emergency channel may become necessary, though REACT approaches the idea "with great reserva-
tions.")
Calling channel: The use of channel 11 for calling only is endorsed.
Permissible communications: Reducing the silent period to 1 minute "is appropriate." There is no objection to
lowering the age limit to 16 years.
Station identification: Simplifying procedure by requiring the station to state
only its own call sign is constructive,
and may lead more licensees to give
proper call sign identification.
Antennas: Changes in height limits,
etc., are generally approved. But the
establishment of antenna acceptance
procedures is questioned. It would,
REACT believes, increase complications
and costs to the licensee, without benefiting him or contributing to the enforcement effort.
Service organizations propose
effective warranty procedure
To help solve the problem of providing warranty service, a committee
composed of representatives of the
three national electronic service dealer
organizations have worked out a pro-
posal covering the warranty of consumer electronic equipment and the
implementation of that warranty. The
proposal will be submitted to all the
national associations for study, approval and action.
The committee was composed of
Nolan Boone, chairman, Little Rock,
AR (member of NARDA, NATESA and
NESDA); Joe Senatra, Milan, IL (representing NARDA); Leon Skalish, Glen olden, PA (representing NATESA) and
Larry Steckler, Hicksville, NY (representing NESDA). The committee met at
the Bismarck Hotel, Chicago, January
10 and 11, 1975.
Text of the proposal follows:
WARRANTY STATEMENT
The warranty should be a full warranty for ninety (90) days covering all
parts and all service. In any equipment
using a picture tube, that tube along
with any devices permanently attached
to it by the manufacturer shall be covered (parts and service) for one (1)
year.
Exclusions (items not covered by the
warranty).
Faults outside the equipment (for
no AC
example but not limited to
power, antenna or reception problems).
Adjustment of any controls described
in the owner's manual.
Abuse or misuse of the equipment
foreign
(for example but not limited
objects inside the equipment, including
liquids; dropping the equipment).
-
to-
IF AN ITEM IS NOT SPECIFICALLY
EXCLUDED IT IS COVERED
BY THE WARRANTY
IMPLEMENTATION OF
THE WARRANTY
Warranty Claims Filed by the Service
Dealer
All claims shall be filed on an acceptable form. (It is the recommendation of
the committee that a single form be
developed for all warranty claims. Since
EIA has developed such a form, they
are encouraged to continue its development and full acceptance.
2. Manufacturers Payment to the Service
Dealer
The amount of payment shall be
determined by an agreement between
the manufacturer and the service dealer.
(The committee recommends that the
service dealer should not accept any
payment rate that is lower than that
dealer's non -warranty service charges.
This includes parts as well as service).
(This follows the procedures stated
presently in the law of the State of
(continued on page 12)
1.
INSTANT CHECKER FOR PACEMAKERS operates over ordinary phone lines. ThIs one at
the German Heart Center of Munich makes it possible for a patient to get a check in 50
seconds. Doctors and nurses at the Heart Center can then use the information to take
indicated action immediately, often saving a life. (Electronic technicians may be equally
interested in the track system that permits equipment to be made mobile and brought to
each patient's bed.)
6
www.americanradiohistory.com
Avoid serious problems
when replacing film capacitors
Use gen Sprague Type
and PM Capacitors
PP
in critical deflection circuits.
The next time you replace a dipped tubular in one of the
newer color TV sets, don't automatically assume you're replac-
on hand for those critical situations where ordinar) replacements could cause serious problems.
ing an ordinary every -day film or paper capacitor. If it
happens to be a deflection capacitor used for commutation
or S- shaping, you need a polypropylene or polycarbonate
film replacement with (1) high a -c current- carrying capability;
(2) close capacitance tolerance; (3) good capacitance stability. The standard replacement capacitors used in the industry,
even our superior Type PS dipped tubulars, just won't do the
job ... they could cause the set to become inoperative again.
SPR
TYPE
,oltgrtr«
il
9
.
5
Play it safe .
.
dipped tubulars may look alike on the
surface, but there can be a big difference in the film dielectric. Keep a supply of Sprague Type PP and PM capacitors
.
SPECIAL DEFLECTION CAPACITORS FOR COMMUTATING ANDS A-IAPING
A Service Technician Introductory Super Special
..
.
the KF -28 ASSORTMENT
...a total list price value of $65.00... ith
a regular dealer net of $35.95...
for
a
low, low
$2520
de&
r
ne
ready for those critical application replacements in
today's color TV sets with the KF -28 Assortment. It contains
41 Type PP and PM polypropylene and polycarbonate capacitors in 20 popular ratings, stocked in a handy cabinet
that puts the film capacitors you need at your fingertips,
neatly organized and easy to find. Measuring 934" wide x
5" high x 61/2" deep, this attractive blue 9- drawer cabinet
has clear plastic drawers with adjustable dividers. Pre labeled drawer fronts identify the capacitors inside. A raised
area on top of the cabinet and a depression in the bottom
facilitate stacking of two or more cabinets.
ASSORTMENT KF -28 CONTENTS
Be
Get a KF -28 Assortment from your Sprague distributor today
MEMBER
!
F
Quan.l
2
1.5
2
.o1
2
.015
2
.033
2
.06
2
.081
2
.2
2
.0018
2
.0022
3
.0039
@ WVD
@
@
@
@
@
@
@
@
@
@
-CCat.
No.
@ WVDC
Quan.
@ 600
Cat. No.
150
PM15-M1.5
2
.01
400
PP4-S10
2
600
PP6-S66S
400
PP4-S 15
2
.066 @
.075 @
600
PF'6-S75S
400
PP4-S33S
2
.022
800
PP8-S22S
400
PP4-S6OS
2
.047
800
P=8-S47S
400
PP4-S81S
2
.051
400
PP4-P20
2
.0018
600
600
PP6-D18S
2
.002
PP6-022S
2
.0033
600
PP6-D39S
2
.0039
@
@
@
@
@
@
@
F P6-S
800 P=8-S5
1600
P'164018
P'16-D20
P'16-D33
1600
P,1039
1600
1600
,>_wINN_
For cross -reference information on close -tolerance polypropylene and
polycarbonate film capacitors, showing original part numbers with
correct Sprague replacements, ask your Sprague distributor for Cross Reference Guide C -873, or write to: Sprague Products Company,
81 Marshall Street, North Adams, Mass. 01247.
THE BROAD -LINE PRODUCER OF ELECTRONIC PARTS
Circle 4 on rrud<v service card
www.americanradiohistory.com
10S
THE MARK OF RELIAS
Compare what you get
training and you'll
Compare costs
Compare training
Compare choices
Only NRI offers five complete
TV/Audio Servicing Courses
from $370 to $1,095 ... with
NRI is one of the few home study
schools that maintains its own
full -time staff of technical
writers, editors, illustrators,
development engineers and
publications experts. The people
who design the kits also design
the lessons ... so that theory and
practice go hand in hand. The
lessons aren't "retro- fitted" to
an outside-source "hobby kit."
At each stage of building, you
experiment with the power on;
you don't wait till the set's
completed to learn troubleshooting. The NRI set is designed
exclusively for training. It is also
a superb 100% solid -state
receiver for your personal use.
Most schools offer one course in
color TV servicing, period. Only
NRI offers you five different
courses to match your needs and
budget. The comprehensive 65lesson course, complete with
7 kits, costs as little as $370. Or
you can choose the $465 course
that includes a 12" diagonal
black & white portable TV for
hands -on experience. Then
there's the 19" diagonal solidstate color TV course for $795 ;
the advanced color TV course
for trained technicians with an
18" diagonal color TV for $645;
and finally, the magnificent 25"
diagonal solid-state color TV
course, complete with console
cabinet, oscilloscope, TV pattern
generator, and a 31/2 digit digital
multimeter, for $1,095. Other
schools charge you hundreds of
dollars more for an equivalent
course.
convenient, inexpensive time
payment plans. In the Master
Course in color TV servicing,
with a 25" diagonal solid -state
color TV, you save as much as
$600 under the next leading
home study school.
NRI saves you tuition because
our costs are lower. We pay no
salesmen, and we engineer our
own kits and training equipment.
We don't buy "hobby kits" from
others. Nor do we penalize you
with big interest charges for
time payments. We pass the
savings on to you.
www.americanradiohistory.com
iniV/Audio home
choose NRI.
Compare equipment Compare schools
NRI has engineered the widest
variety of professional electronic
lab equipment ever designed
entirely for training at home.
When you enroll in the Master
Course in TV /Audio Servicing,
for instance, you receive kits to
build a wide band, solid-state,
triggered sweep, service type 5"
Oscilloscope ; color pattern
generator ; solid -state radio ; and
a digital multimeter.
Before you settle on any home
training course, compare the
over-all program. See if you are
getting kits engineered for
experimentation and training
. or merely "hobby kits ". Count
the experiments ... compare the
components. Don't just count
kits. (Some schools even call a
slide rule a kit.)
Home study isn't a sideline with
NRI. We've been its innovating
leader for 60 years. Ask any of
the hundreds of thousands of
NRI graduates. They'll tell you
... you can pay more but you
can't buy better training.
Along with each course, NRI
provides bite -size, fullyillustrated lessons ; personally
graded tests ; and the kind of
person -to- person teaching that
makes learning easier and faster.
Send for the free NRI full color electronics catalog and
discover why so many choose
NRI. You'll find courses offered
in TV /Audio Servicing,
FCC License, Complete
Communications Electronics,
Digital Computer Electronics,
Marine and Aircraft Electronics,
Mobile Communications, etc.
www.americanradiohistory.com
NRI Ilome'Prao- i
in Electronics
17,
MAIL CARD
FOR YOUR
FREE NRI
CATALOG
NO SALESMAN WILL CALL.
AVAILABLE FOR CAREETI
STUDY UNDER GI BILL
for informant n.
Check box on card
.l
NRI
wl ' McGraw
r4
t=
It'll
-Hill Continuing Education
3939 Wisconsin Avenue,
iWashington,
D.C. 20016
Z
enter
Radio-Electronics®
new Go t I meI
(continued from page 6)
Hugo Gernsback (1884 -1967) founder
M. Harvey Gernsback
editor -in -chief and publisher
Larry Steckler, CET, editor
Robert F. Scott, W2PWG, CET,
technical editor
Arthur Kleiman, associate editor
Jack Darr, CET service editor
I. Queen, editorial associate
Leonard Feldman
contributing high -fidelity editor
David Lachenbruch, contributing editor
Karl Savon, semiconductor editor
Barbara Schwartz, editorial assistant
Vincent P. Cicenia, production manager
Sarah Martin, production assistant
Harriet I. Matysko, circulation director
Arline R. Bailey, advertising coordinator
Cover photo courtesy Walter Herstatt
Cover design by Louis G. Rubsamen
Radio Electronics is a member of the
Institute of High Fidelity and is indexed
in Applied Science & Technology Index
and Readers Guide to Periodical Literature.
Minnesota that says: "Reasonable combe the amount of
money that the service dealer charges
his other customers for like services
or repairs not covered by warranty protection.... In addition, the manufacturer
shall reimburse the service dealer at
that dealer's normal retail price.... for
all parts and materials needed to effect
the manufacturer's guarantee. ")
Ali claims submitted to the manufacturer shall be paid in full or returned
with question, within 30 days of receipt
of the claim by the manufacturer.
3. Parts
Defective warranty parts removed by
the service dealer shall be retained by
that dealer for one (1) month and ten
(10) days. The manufacturer may request that removed parts be picked up
by his agent or be shipped to him at
the expense of the manufacturer. If
this request is not made by the end of
the period of
month and 10 days from
the date of the claim, the parts may be
disposed of by the service dealer.
Payment for parts shall be a part of
the warranty agreement between the
manufacturer and the service dealer.
(See Part 3: Manufacturer's Payment to
the Service Dealer for details.)
Many of the procedures and recommendations and procedures in the proposal above are the result of long -term
efforts by national, regional, State and
local associations, who have put a great
deal of time and effort into developing
a practical warranty plan that would
protect the equipment owner by making
it possible for the service dealer to
implement the manufacturer's warranty.
pensation.... shall
cases of lead poisoning were reported
in the United States in 1973, and it is
estimated that 25% of children, 5% of
men and 2% of women have in their
bodies quantities of lead that are near
the toxic level. Young children often
swallow paint chips and breathe dust
1
Radio -Electronics is published by Gernsback Publications, Inc. 200 Park Ave. S.
New York, NY 10003 (212) 777 -6400
President: M. Harvey Gernsback
Secretary: Bertina Baer
ADVERTISING SALES
EAST
Stanley Levitan, Sales Manager
Radio -Electronics
200 Park Ave. South
New York, NY 10003
(212) 777 -6400
MIDWEST /Texas /Arkansas /Okla.
Ralph Bergen
The Ralph Bergen Co.
6319 N. Central Ave.
Chicago, IL 60646
(312) 792 -3646
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
Electronic lead poisoning test
is quick and inexpensive
A new blood test for lead poisoning
can be performed in one minute, with
equipment far less complex and expensive than has previously been needed.
The new technique,
devised by
scientists at Bell Laboratories, uses the
fluorescence, or light emission, of the
blood when the sample is irradiated with
a beam of blue light. To conduct a test,
the nurse would take a drop of blood
from the subject's finger, place it on a
glass slide and insert it in a special
fluorimeter. If the person has absorbed
excessive amounts of lead, the blood
gives off red light of a specific frequency.
The intensity of the red fluorescene is
recorded on a digital meter to indicate
the lead level in the blood.
Lead poisoning is a serious problem,
especially in cities, though the situation
was improved somewhat by the 1970
restriction of lead in paint. Over 30,000
www.americanradiohistory.com
THE PORTABLE ELECTRONIC TESTER uses
a single drop of blood (note the slide, fore-
ground) and gives
a
quick digital readout.
that may have fallen from the walls of
old houses. Another source of lead is
city dust that has a high lead content
from automobile exhausts.
Bell Labs scientists have also devised
an inexpensive portable instrument that
can be used by a school nurse. Former
techniques required a small test tube
full of blood, and expensive and complicated equipment and techniques, including atomic spectroscopy.
Electronic labels will identify
vehicles or shipping containers
A system that will identify large shipping containers, trucks or other vehicles
by serial or license number has been
delivered to the US Army by Fairchild
Space and Electronics Co. for testing
and evaluation.
The system uses electronic labels to
identify and record the location of containers used to transport goods. It can
identify railroad cars, piggyback trailers
and automobiles equally well.
The automatic interrogator reads the
serial number on each container that
passes through its field, reading labels
while the containers are in motion at
speeds as great as 85 miles -per -hour
and at distances up to 20 feet. The
accuracy is expected to be several
orders greater than that obtained with
existing systems.
R -E
410 to 1
you'll find
.th_
devices
you need
Over 103,200 devices can be replaces bpi 250
RCA SK Series types. That's 410 to 1! Best rai io in
the industry. Which means the odds are, SK s
your best, fastest way to get what you need. with
minimum inventory.
Rl q/1
And RCA provides the
top qualityyou'd expect
from a top manufacturer of OEM devices.
Same strict AQL standards, same strict Directorof QualityAssu rance.
Get SK devices and
your free 1975 SK
Series Replacement
Guide from your local
RCA distributor.
here.
Circle
5 on
reader service card
www.americanradiohistory.com
13
alters
plug in
and go
MOD FOR ALARM SYSTEM
regard to your article 'Protect
Your Home, Build An Electronic Alarm
System" in the April 1974 issue of
Radio -Electronics,
would like to make
a slight modification.
A problem is encountered when the
door is first opened to arm the security
system. When the alarm is first turned
In
I
soldering
/N
would like to see some sort of calculator interface, since the Mark -8 is a
little limited .n dealing with large decimal numbers. In addition, while my
present Mark-8 will use 1K of 1101
memory,
would like to expand with a
I
I
on, pins 8 and 9 of IC1 are at zero potential. When the door is opened, pin
9 goes to a logic 1. As soon as the door
is closed, pin 8 changes to a logic 1 at
a time constant of R4 r
C3. At the
same time, pin 9 is discharging at a
time constant equal to R5 > C4. There
is a slight coincidence on pins 8 and 9
during which the output pin 10 goes to
a logic zero and latches in starting the
fifteen -second delay.
The problem can be solved by replacing R4 with a 1- megohm resistor.
This change in value will slow down
the charging rate and eliminates the
coincidence problem.
TEDDY VANSTEEN
Lindenhurst, NY
TVT- MARK -8
just wanted to add my thanks for
the Mark -8 Minicomputer project.
have enclosed two photographs, one
of the Mark -8 next to my TV Typewriter,
and the other, an internal view of my
Mark -8 with the front panel lying down.
I
I
WITH
THRIFTY
denser chip and a PROM. How about
another board providing up to 3K of
2102 RAM or some PROM.
Lastly, let me add my voice to those
requesting a regular column based on
the Mark -8 fcr new programming ideas
and hardware.
Thanks again for a great project.
STEVEN J. W1NICK
Silver Spring, MD
LOOK ME OVER!
MARKSMAN IRONS
alWeller
Pre tinned tips for instant action
five
different ratings for technicians and
hobbyists Heat- and impact -resistant
handles grip comfortably. Premium
stainless steel barrel for strength
corrosion resistance, and more even
temperatures Cone shape, screw
driver, chisel tips. Soldering Kit. Hot
Knife Kit for wire stripping and plastic
cutting. Full -view card pack lets you
see and read about these UL-listed
factory -pre -tested irons before you
.
buy
See
your local distributor or write.
Weller- Xcelite
Electronics Division
4- The Cooper Group
COOPER
I`
«amartsl
Circle
P. O. BOX 728.
APEX. NORTH CAROLINA 27502
6 on
As can be seen,
panel mounted the
LED's rather than putting them on the
PC board and used modular construction with a simple mother board and
Molex edge connectors instead of the
suggested wire connectors.
am in the process of writing an interactive supervisor program to execute
commands typed on the TV Typewriter.
It permits me to create and edit programs, execute them, list them, or store
them on cassette via an interface
designed.
My TV Typewriter, constructed last
year thanks to you, also has a programmable desk calculator in the same
cabinet.
I
I
I
reader service card
www.americanradiohistory.com
installed my TVT in cabinets and
moved all the switches from the mainframe to the keyboard cabinet.
added four keys to my TVT to get
the
j,
aid / symbols, completing
the TVT alphaoet set.
LAURENCE PLATE JR.
Santa Barbara, CA
I
I
-
Radio Shack announces new
heights in Archer®antennasl
FCC rules now allow your omnidirectional
CB antenna to be 60 feet above ground
triple the old limit! Take advantage of the
-
amended rules to upgrade your antenna
(Part 95, Sections 95.3 & 95.37C).
Deluxe Colinear. Outstanding 4 dB gain and
low radiation angle -this is the one for maximum omnidirectional CB range. 19 -ft., 10 -in.
5/8 -wave radiator. Static dissipator. Fits masts
to 1 -5/8" dia. #21 -1133.
Deluxe
Colineal
3495
Half Wave. More gain (3.75 dB) than many
high -priced omni's. 5- section seamless aluminum half -wave radiator, 52" radials, static
dissipating hex loops, 1.25 -to -1 VSWR. Fits
masts to 1 -5/8" dia. #21 -902.
Hal f Wave
Ground Plane. The low- priced "omni with the
mostest:' All tubular aluminum elements,
quarter wave radiator, three 108" quarter
wave radials, static discharge protector. Fits
masts to 1 -5/8" dia. #21 -901.
New 1976
FREE
Radio Shack Catalog
OVER 2000 PRODUCTS
EXCLUSIVES ON EVERY PAGE
BEAUTIFUL FULL COLOR
40-
Asse -n Wei l,
easy to pt:!
ùpx: Four
Stereo Quadraphonic Phonographs
TV Antennas Radios Citizens Band
Kits Recorders Tape Tools
Auto Tune-Up Electronic Parts
Test Instruments More!
interlock
NEW FOR
Coming
Soon'.
76
PI
18~4au9e,
Plane
1295
Respected brand names like
Realistic, Micronta. Archer,
Science Fair
and they're
available only at Radio
Shack stores and dealers
nationwide! See what's really
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r
swfäs-
Ground
164 pages of the finest in
home and hobby electronics
iwfi
:ii
Antenna'hl
o
,
o
;IIUy
(ro
this catalog now
SEND FOR YOURS TODAY!
FILL OUT COUPON BELOW
1976
Mail to Radio Shack, P. O. Box 1052,
Catalog Ft. Worth, Texas 78101. (Please print.)
Name
Shoo; +' ladio
5haclf for
eve' ling
535
in a'1 nna
ac:;,!t orles
Apt. No.
There's only one place you can
Street
City
State
ZIP
Mastercharge or
Bank Americard at
participating stores
Circle
7 on
reader service card
www.americanradiohistory.com
fi
ìc
m
Radio Ihaek
A
TANDY CORPORATION COMPANY
3000 STORES
50 STATES
7 COUNTRIES
Retail prices may vary at individual stores
tp
v
to
15
BUILD
equip
reports
asryesTas wuTMi
POWER FOR THE PROFESSIONAL
ECONOMY KITS FOR THE HOBBYIST
A MODEL AND A PRICE FOR EVERYONE
PROTO BOARD 203
Breadboard Prototesting with 5 Volt,
1 AMP Regulated Power Supply included!
A total ready -to -use power breadboard
prototest device with a built -in regulated,
short -proof power supply. Just plug -in and
start building! 2 extra floating 5-way
binding posts for external signals. Selfcontained with power switch indicator lamp
and power fuse. 24 -14 pin DIP capacity.
Attractive two -tone quality case. All metal
construction. 93/4"L x
Order x 233/4a "H. 5 lbs.
Order today!
Add $2.50 shipping/handling
A modestly priced kit for the
economy- minded experimenter...
PROTO BOARD 100
A low cost, big 10 IC capacity breadboard
kit with all the quality of QT sockets and the
complete
best of the Proto Board series
down to the last nut, bolt and screw. Includes
2 QT -35S Sockets;
QT -35B Bus Strip; 2
5 -way binding posts; 4 rubber feet;
screws, nuts, bolts; and easy
assembly instructions.
...
PROTO -CLIP
for Power -On,
Add $1.50
shipping/ handling.
Hands -Off Signal
Tracing. No more
shorting leads.
Costs less than .. .
$5
Bring
IC leads from pc board for fast signal tracing and
troubleshooting. Inject signals. Wire unused circuits
into boards. Scope probes and test leads lock onto
Dynagrip inset (see circle) for hands -off testing. Plastic
construction eliminates springs, pivots. Non -corrosive
nickel /silver contacts for simultaneous
low resistance connections.
PC-14, 14 -pin
Proto Clip, $4.50 ea.
Proto Clip, $4.75 ea.
Add 75C shipping /handling.
PC -16, 16 -pin
Order today off -the -shelf from CSC
or local distributor. Charge: BAC,
MC, AX. Write for free catalog. Free
English /Metric Slide Rule with each
order. Dealer inquiries invited.
=0=
Foreign Orders add 15 %.
Patents Pending Made in
Prices subject to change
16
Box 1942, New Haven, CT 06509
Circle
8 on
203/624-3103
415/383-4207
reader service card
www.americanradiohistory.com
A
necessity on the experimenters and technicians workbench. Up until recently
however, the calibrated dual -trace triggered -sweep scope has been considered
a luxury item. But this has all changed.
The advent of integrated circuits and
the application of state -of- the -art electronics in consumer products has made
the scope a necessity.
For those readers considering purchasing a new scope, the I0 -4510 should
definitely be among the ones being considered. This recent addition to the
Heath Co. line is a lab- quality instrument with impressive specifications.
The vertical amplifiers have a sensitivity of 1mV /cm to 5 V /cm in a 1 -3 -5
sequence, accurate to 3%. Frequency response is DC to 15 MHz ( -3dB). Rise
time is 24 nanoseconds with less than 3%
overshoot. The input impedance is 1
megohm shunted by 38 pF. Maximum
input voltage is 400 volts peak combined
AC and DC.
The horizontal time base has a range
of 200 ms /cm to 100 ns /cm in 22 calibrated steps with a -3 -5 sequence, accurate to within 3 %. A concentric control provides continuously variable speeds
between steps, with a maximum range
of 500 ms /cm. The variable control can
be pulled out to expand any sweep speed
times five, accurate to within 5 %.
An external horizontal input signal
can be applied directly to the deflection
circuits by turning the time base switch
to the appropriate position. This input
has an impedance of approximately 200K
ohms. A horizontal input attenuator is
not provided and the input sensitivity is
0.2 V /cm. All input connections are of
the BNC type.
In the X -Y mode, one of the scopes
two vertical amplifiers is used as the
horizontal amplifier. Therefore, the horizontal sensitivity is equal to the vertical
sensitivity and a calibrated attenuator is
available for the horizontal signal. The
scope is switched to the X-Y mode by
turning the time base switch to the appropriate position. The X -Y phase shift
is less than 3° at 100 kHz (an important
factor to consider when using the scope
as a vectorscope).
Continental Specialties Corp.
W. Coast Off.: Box 7809, S. Francisco, CA 94119
Canada: Available thru Len Finkler Ltd., Ontario
USA
THE OSCILLOSCOPE HAS ALWAYS BEEN
1
i
19'°
Heath 10 -4510 DC -15 MHz
Dual -Trace Oscilloscope
Triggering can be selected from either
the line frequency, either vertical input
signal or an external trigger signal. The
trigger select switch and concentric level
(continued on page 22)
Altair Computer Report
er Language You Can Understand
ITS
tional functions (COS, LOG, EXP, TAN, ATN, INP, FRE, POS) and
GOSUB. OUT,
4 additional statements (ON.... GOTO, ON
DEF) and 1 additional command (CONT). This BASIC has ,? multitude of advanced STRING functions and it can be used t. ontrol
low speed devices -features not normally found in mans BASIC
sjve, general -purpose computer
x4fanced data processing. It is easy
f,
...
c4
0
Vc 1-overall MITS computer concept.
understandable and affordable.
yó
languages.
The third ALTAIR BASIC is the EXTENDED BASIC version
designed to run on an Altair with as little as 12,000 words of
memory. It is the same as the 8K BASIC with the add tion of
PRINT USING, DISK /O, and double precision (13 digit accuracy)
add, substract, multiply and divide.
ALTAIR BASIC is only the beginning. MITS is currently engaged
in an extensive software development program. Our Disk Operating System is scheduled for delivery in August. Other ; oftware
now available includes an Assembler, System Monitor, and Text
The first of these is a
'Itair with as little as 4,000 words
Q
-- language has 6 functions (RND,
e addition to 15 statements (IF
tie
° JEXT, READ, INPUT, END, DATA,
em 4, STOP and 4 commands (LIST,
.
-23s
I
is the 8K BASIC designed
is 8,000 words of memory. This
he 4K BASIC only with 8 addi-
)tion
Editor.
L
S GROUP
rAlp
.. Users Group is both a means of communiamong Altair Users and a method of building a
comprehensive library of Altair Programs. All Altair
purchasers are entitled to a free, one year membership
in this group.
a-..
t
Creative Electronics
n
MITS/6328 Linn, N.E., Albuquerque, NM 87108 505/265 -7553
Members of the Altair Users Group are encouraged
to submit programs by entering Altair "Software Contests' Winners of these contests are awarded prizes of
up to $1,000 credit toward the purchase of an Altair
Computer or Altair options.
D Enclosed
Contest winners are announced in the Altair newspaper, Computer Notes, which is published monthly
and mailed free to all members of the Altair Users
D Time Payment
D
MAIL THIS COUPON TODAY!
check for $
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(list on separate sheet)
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is
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Notes contains complete update
information on Altair hardware and software developments, programming tips, general computer articles
and other useful information.
Associate Memberships are available to non -Altair
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refunded to Associate Members who buy an Altair Computer within 8 months after they become a member.
Group. Computer
NAME
ADDRESS
STATE & ZIP
MITS/6328 Linn, N.E., Albuquerque, NM 87108 505/265 -7 553
CITY
COMPUTER TRADE - IN
ALTAIR TIME PAYMENT PLAN
If you have a Mark 8 or a Scelbi -8H computer and
you'd rather have an Altair 8800, we will offer you
$150.00 on a trade -in for an Altair plus 4K of memory.
For an Altair Computer kit, send in your used computer plus a check for $561.00 ($439.00 for an Altair
plus $264.00 for memory plus $8.00 for postage and
handling minus $150.00). For an assembled Altair with
4K of memory, send in your used computer plus a check
(kits only)
The Altair time payment plan allows you to be the owner of an Altair
Computer with 256 words of memory for just $68.75 a month. Each month
(for 8 months) you send in your payment and we send you par of an Altair
kit until you have the complete system. The advantages to tris plan are:
NO interest or financing charge, GUARANTEED price based on today's
price, and free, immediate membership to the Altair Users Group.
Here's how our payment plan works:
for $817.00.
PRICES
You Pay
$439.00
Altair Computer kit with complete assembly instructions
$621.00
Assembled and tested Altair Computer
assembled
$209.00
$176.00 kit and
1,024 word memory board
assembled
kit
and
$338.00
$264,00
board
4,096 word memory
$92.00 kit and $114.00 assembled
Full Parallel Interface board
$119.00 kit and $138.00 assembled
Serial Interface board (RS232)
Serial Interface board (TTL or teletype)
$124.00 kit and $146.00 assembled
4K BASIC Language (when purchased with Altair, 4,096 word
$60.00
memory and Interface board)
8K BASIC Language (when purchased with Altair, 2 4,096 word
$75.00
memory boards and Interface board)
EXTENDED BASIC (when purchased with Altair, 3 4,096 word
$150.00
memory boards and Interface board)
NOTE: Altair Computers and software come with complete documentation and operating instructions. BASIC language is available
on either paper tape or cassette tape (specify). Warranty: 90 days
on parts for kits and 90 days on parts and labor for assembled units.
Prices, specifications and delivery subject to change.
Circle
Month
Month
Month
Month
Month
Month
Month
Month
One
$68.75
Two
Three
Four
Five
$68.75
$68.75
$68.75
$68.75
Six
$68.75
Seven $68.75
Eight $68.75
Total
$550.00
You receive
Assembly, Operators, and Theory of Operation manuals
Power Supply (includes board and all component *)
Expander Card
Case with hardware
1K Static Memory Board with 256 words of memo y
CPU Board with all components except processor chip
Control Board with all components
Processor chip
(Retail price: Altair $439.00, Memory $103.00, Postage and
handling $8.00 -total $550.00)
Our terms are cash with order, BankAmericard or Master Charge. If you
send in an early payment we will make an early shipment By the same
token, a late payment will result in a late shipment. (Afte- 60 days past
due, the balance of the deal is cancelled. All payments must be made
within
10
months)
Offer expires July
9 on
reader service card
www.americanradiohistory.com
30, 1975.
17
tì
-;
www.americanradiohistory.com
"Learn an honest trade;'my old man
used to say,"and you'll never have
to knuckle under to any man:'
(A TRUE STORY)
of Conshohocken, Pa.,
has it made.
But you're never alonè. Skilled instructors are always ready to help you.
At 23, he's a licensed master electrician. The top of a trade where there aren't
enough good men to go around.
Ifyou ever have doubts or problems or
just want to talk to your instructor, you can
call ICS from anywhere, Toll -free.
But more important, Bill's his own boss
and calls his own shots.
ICS training works
Bill De Medio
"I just went into my own business. And
even before the sign on my truck was dry,
I
got my first big job.
"The contractor for a new group of
houses asked me to do all the wiring. And
there's bound to be a lot more work from
him and other builders.
"If it wasn't for my ICS training as an
electrician, I'd still be in some dead -endjob
hating what I was doing, taking orders from
everyone, and never getting any thanks
for it.
"As a master electrician, you're the boss
on the job -even when you're working for
someone. You get respect, good money, and
like my old man said, you don't have to take
baloney from anyone."
The right combination for success
Bill De Medio has the right combinafor
tion
success. He's in a growing field. And
he has good training for it. You could, too.
-
More than 8,500,000 men and women
have turned to ICS for career training in the
past 80 years.
Government agencies, unions and some
of America's top corporations (including
Ford, U.S. Steel, Mobil, Alcoa, Pan Am, GE,
Motorola and RCA) use ICS courses in their
own training programs.
Free demonstration lesson
Ifyou want your job to give you more,
(more money, more day -to -day satisfaction,
and more future) send for our career guide
booklet and free demonstration lesson.
Remember, it's your life. You might as
well make the most of it.
e 1973 ICS
1WI
I
I
Please send me the Free Career Guidance Booklet and
Free Demonstration Lesson for the field I have checked
below. I understand I am under no obligation.
I
I
I
I
Electrician
I
I
I
Especially if you're interested in one of
the fast -growing careers where ICS concentrates its training. Like Electrician. Engineering. Automotive Mechanic. TV Repair &
I
I
Servicing. Drafting. Air Conditioning.
(Check your choice on attached card.)
Ideal way to learn
As an ICS student, you study at home,
your
own schedule. You waste no time
on
traveling to and from class. And you never
have to miss a paycheck.
International Correspondence Schools
Scranton, Pennsylvania 18515
I
Automotive Mechanics
TV Service & Repair
Airline/Travel Specialist
Airline Passenger Agent
Airline Cargo Agent
Architectural Drafting
Mechanical Engineering
Diesel /Truck Specialist
Accountant
security and gets more respect than guys twice
his age. (Photograph by Frank Cowan.)
(
Drafting
Civil Engineering
Interior Decorating
Motel /Hotel Mgt.
Restaurant/Club Mgt.
Income Tax Specialist
Licensing
Engineering
ICS High School
Diploma Program
or Equivalency
FCC
X n81151
Age
Name
Address
Zip
Canadian residents use this address for service from ICS Canadian, Ltd.
LN Wwair 931 University Ave, Honolulu, Hawaii 55584.
If card is missing, please fill in the coupon and mail it to: ICS, Scranton, Pennsylvania 18515.)
www.americanradiohistory.com
I
I
I
Transmission Specialist
Electronics Technician
Data Processing Mgt.
Air Conditioning &
Refrigeration
Check for special information, if age l6 or under
State
I
Business Management
City
At 23, Bill De Medio has more freedom, more
I
I
I
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I
I
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I
I
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I
EQUIPMENT REPORTS
(continued from page 16)
Straight talk
about a itylur
still hear some audiophiles refer to the
record stylus as ... "the needle." The fact is that
the stylus of today bears no more resemblance to
a needle than it does to a ten -penny nail. In fact,
a Shure stylus is probably the most skillfully assembled, critically important and carefully tested
component in any high fidelity system. It must
maintain flawless contact with the undulating
walls of the record groove
at the whisper weight tracking forces required to preserve the
fidelity of your records. We put everything we
know into Shure Stereo Dynetic Stylus Assemblies
and we tell all about it in an informative booklet. For your copy, write:
You can
-
-
Shure Brothers Inc.
222 Hartrey Ave., Evanston, III. 60204
In Canada: A. C. Simmonds & Sons Limited
Fi S--IVRE=
22
control permits the time base to be triggered at any point along the positive or
negative slope of the trigger signal. In
addition, an AUTO position on the concentric level control generates a baseline
when no trigger signal is present. This
aids the operator in locating a trace when
there is no input signal applied to the
scope. The AUTO position also triggers
the time base at the zero crossing point
of the trigger signal.
The TRIGGER MODE select switch permits triggering on either AC or DC trigger signals. In the DC mode, the bandwidth of the trigger signal is DC to 30
MHz, typically DC to 45 MHz. In the
AC position, the bandwidth of the trigger
signal is 20 Hz to 30 MHz, typically 20
Hz to 40 MHz. A third position of the
TRIGGER MODE select switch permits triggering on the high- frequency components
of the trigger signal only. This ACF position has a trigger bandwidth of 15 kHz
to 30 MHz, typically 15 kHz to 45 MHz.
The scope will trigger on any input signal that will produce a vertical deflection
of 0.5 cm or less. The sensitivity of the
external trigger input is 0.5 V or less,
typically 0.1 V. The impedance of the
external trigger input is 1 megohm shunted by approximately 30 pF. An internal
non -adjustable delay line allows the
scope to display at least 20 ns of pretriggered waveform.
A front panel connector provides a
calibrated 1 V peak -to -peak square wave.
This signal can be used for calibration
checks and for probe compensation adjustments.
The CRT graticule measures 6 cm X
10 cm and the illumination is adjustable.
A P31 phospher is used that produces a
blue trace. This phospher is a compromise
between a fast writing speed and high
burn resistance. The CRT is a special
type that uses post- deflection acceleration
to increase the writing speed. The acceleration potential is 4000 volts.
Assembly
Typical of Heath Co. products, the assembly instructions are concise and easy
to follow.
The circuits are mounted on five plug in printed circuit boards. The delay lines
are etched and comprise two more printed circuit boards. Assembly was straight
forward and high -quality components
were provided.
A hefty number of IC's are used and
all IC's are mounted in sockets for easy
removal. Circuit board interconnection
is done via a pre -assembled wiring harness. Chassis layout is neat and the circuit boards are easily accessible. Both
the top and bottom covers are removable.
One sure blessing are the printed circuit board switches. These eliminate the
need to connect wires to each individual
point on the rotary switches. An assembly
chore that I despise with a passion. Jumper wires are also minimized by the use
of double -sided boards where necessary.
The scope is housed in a 615,46 in. high
X 127/a in. wide X 211/2 in. deep metal
Circle 10 on reader service card
www.americanradiohistory.com
cabinet with a swing handle that matches
other top -of- the -line test instruments
from Heath. An AC line switch allows
operation from a 100 to 140 VAC or 200
to 280 VAC power source.
Comments
Assembly was smooth and the scope
worked perfectly when power was first
applied, except for one hitch. The input
to one of the vertical amplifiers was
grounded. A few minutes of investigation
revealed that the printed circuit board
near the input switch wasn't completely
etched through. One good scrape with a
sharp instrument cleared this problem
up instantly.
The calibration procedures are complex and require some patience. The initial calibration procedures should be
gone through about three times from
beginning to end to set the scope up
properly. I'm not criticizing the scope for
this point. In fact, I'm complimenting it.
All lab- quality calibrated scopes are
typical of complex calibration procedures. After the initial calibration procedures are completed, simple touch -up
calibration should be performed periodically.
I have used the scope for about two
months and it has performed flawlessly.
I've yet to find a signal that this scope
cannot give a rock -steady display of.
The sensitivity is adequate for just about
any application you can think of. I
would have preferred the bandwidth to
be in the 30 MHz to 50 MHz range, but
for the price, the scope is hard to beat.
Then again, how often do you run across
signals that have components higher than
15 MHz.
The scope sells for $549.95 in kit form.
The factory wired and calibrated version, SO -4510, sells
ACS Mk
for $750.
R-E
1
Function Generator
FOR SOME REASON, PROBABLY DUE TO MY
sedentary habits, I had read about Function Generators, but had never seen one
before. So when I opened the box and
found one, a little of what we used to
refer to as "woodshedding" was in order.
In the long ago and far away, this meant
going to the woodshed with an alleged
O
C3
'
rc7
Circle 91 on reader service card
musical instrument for badly needed
practice. So, I had to do a little excavation in my reference library. This turned
up an excellent description of the thing.
( "Electronic Measurements and Instrumentation," Oliver and Cage, McGraw Hill; Ch. 10, Audio Signal Sources, pp.
345 -349) .
It turns out to be a very special type
of audio signal generator. Sine, square
(continued on page 25)
Ele
W
DYNACO
IS
RIGHT
Southwest Technical Products Corporation
219
CSan
W
Rhapsody
Antonio, Texas 78216
July, 1975
-
Most of you are aware of the new FTC Power Amplifier Rating Rule. I would like to commend Dynaco
Inc. for having the courage to challenge portions of this rule and I would like to join them in asking for a review by the FTC. The purpose of this rule was to protect consumers from being mislead by inflated power
output claims and confusing distortion and bandwidth figures; by "home entertainment" sound equipment
manufacturers. Such manufacturers are, generally speaking, divided into two groups; the packaged or console systems manufacturer and the component systems manufacturer. The "Rule" applies to both, although
do not feel that component manufacturers have been guilty of the type advertising that the FTC seeks to
eliminate. The vast majority of the consumers who purchase component sound equipment are sound "enthusiasts". They have available to them at least half a dozen magazines that regularly test and report on
this type equipment. No component manufacturer in his right mind would attempt to sell his product by
resorting to the type advertising and claims that have been used by console manufacturers. The type consumer that purchases component sound equipment is far too knowledgeable to be fooled by fantastic power
output claims.
I
The "Rule" is supposed to provide "a single industry standard which is meaningful to the consumer ".
(Federal Trade Commission bulletin -Nov. 1974) Now any of you who are in any way familiar with amplifiers well know that such a thing is simply impossible unless a considerable amount of information (some of
it quite technical) is provided. The "Rule" does not do this however. It attempts to inform the consumer by
means of a single statement concerning power output at a specific bandwidth and distortion level. Worse,
yet, it does not allow any type statement on other characteristics, such as bandwidth, unless the prescribed
power and distortion information is also given. The effect of the "Rule" as it now stands is to make it impossible for a manufacturer to provide some types of data no matter how badly he may want to.
The worst part however is yet to come. In addition to the problems with the required disclosure all
amplifiers must be preconditioned by being operated at one third (1/3) rated power output for a period of
one hour. Now this just happens to be almost exactly the point at which maximum heat is generated by a
class B amplifier. This may be a realistic operating level for console equipment, but it is totally unrealistic
as far as the average component amplifier is concerned. As Dynaco points out, this is only 5.0 dB below
maximum output (clipping). Operation under such conditions would result in almost continuous gross
distortion which the owner of component equipment would never tolerate. This is like requiring the automobile manufacturers to run all cars on a dynamometer -at maximum rated horsepower output for the
equivalent of 500 miles before any tests are made to "warm up the engine ". You can imagine the result.
Neither cars, or amplifiers sold for personal use are designed to withstand operation at maximum stress
point on a continuous basis. Requiring this can only result in one of two things; the manufacturer will
derate the power and seriously mislead the consumer as to actual capabilities, or he will be forced to add
considerable cost to the product to make it capable of continuous operation under worst case conditions.
Unfortunately some manufacturers of industrial duty "wall shakers" have cheered on this concept for selfish reasons.
do not think that the "Rule" as now stated helps the consumer. It is now quite clear what the results
for the purchaser of console equipment. Read the ads and see for yourself; manufacturers
of this type sound equipment simply no longer make any statements about power output, distortion, or
bandwidth. Do the consumers now know more than previously? Have they been helped in any way? feel
that this attempt at regulation has resulted in problems for component manufacturers, whose customers
were in no need of government bureaucratic protection and no benefit whatsoever to the purchasers of con sole equipment who still don't know any more than before.
I
are going to be
I
I would be happy
to send anyone who is interested a copy of Dynaco's excellent technical analysis of
the situation. If you would like to offer any comments pro or con directly to the FTC, you can write: Mr.
C. E. Aldhizer -FTC, Room 508 Indiana Bldg. 615 Indiana Ave., Washington, D.C. 20580.
Daniel Meyer
Circle 13 on reader service card
www.americanradiohistory.com
23
If you're thinking about putting
together a hi -fi system first take it apart
in your mind.
The quality sound of high fidelity
components will give you years of
enjoyment -if you choose your system
wisely in the beginning.
To help you choose wisely, the
Institute of High Fidelity has
published the "Official Guide
to High Fidelity." Written
in easy -to- understand
language. the Guide's
abundantly illustrated
176 pages will help you
appreciate true high fidelity
sound and give you all the
information you need to make
an intelligent buying decision.
EXTRA! Earn a handsome Certificate of Audio Achievement and ID
Card entitling you to many valuable
benefits, when you pass a test
included in the book.
Just send $2.00 check or
money order to cover
cost, postage and handling and it's yours.
-
-
IA
INSTITUTE OF HIGH FIDELITY
Acoustic Research Inc. Altec Audio
Dynamics Corp. Audio Times Bose
Corp. Bozak B.I.C. Turntables /Speaker
Systems BSR (USA) Ltd. Cerwin -Vega
Inc. C/M Laboratories Crown International Dokorder Inc. Dual (United Audio
Products) Dynaco Inc. Electro -Voice Elpa
Marketing Industries Inc. Empire Scientific
Corp. Ess Inc. Fisher Radio FM Guide
Harman -Kardon Inc. High Fidelity Trade News
Hitachi Sales Corp. Infinity Systems Inc. JBL
Loudspeakers Jensen Sound Laboratories JVC
Kenwood Electronics Inc. Koss Corp. Maxell
Corp. of America Maximus Sound Miracord
(Benjamin Sound) Nikko North American
Philips Corp. Pickering Cartridges /Headsets
Pioneer Electronics Rectilinear Speaker
Systems Sansui Scintrex Inc. H. H. Scott
Inc. Sherwood Electronic Labs Shure Brothers
Inc. Sony Corp. of America Soundcraftsmen
Stanton Cartridges /Headsets Stereo Review
Superex Stereophones Sylvania Tandberg of
America Inc. Tannoy (America) Ltd. TDK
Electronics Corp. TEAC Technics by
Panasonic Utah Electronics.
INSTITUTE OF HIGH FIDELITY, INC.
489 Fifth Avenue, New York, N.Y. 10017
Please send me a copy of Official Guide to High Fidelity. Attached is $2.00 to cover cost, postage, handling.
Name
Address
City/State
(Send no cash or stamps)
Zip
www.americanradiohistory.com
EQUIPMENT REPORTS
(continued from page 22)
and triangular waveforms can be generated with extreme precision. How, in
just a moment. The name function generator comes from the fact that there is
a mathematical function which can describe any sinewave or other signal with
a continuously- repeating waveform. So
the signal can also describe the mathematical function; ergo, function- generator.
The major difference between this instrument and the older types is that it
does not generate signals by means of a
conventional oscillator. They're synthesized- "made up" from a different type
of signal. Integration of a square wave
can develop a triangular waveform. A
triangular waveform, fed through a long
series of biased- diodes and resistors, will
product a sine waveform. The use of large
numbers of diode- resistor combinations,
easily possible in IC circuitry, can give us
sinewaves with very low distortion.
Before the advent of the IC, such instruments were large and very expensive.
Now, they come in very compact packages indeed. The one I got is the Mk. 1,
built by American Circuits and Systems,
Inc., Box 149, Planetarium Station, N.Y.
10024. This is a little dandy; it's only 4
inches high, 11 inches long and 8 inches
deep. This will generate all three function signals (sine, square and triangle)
over a frequency range from 10 Hz to
1.0 MHz. A 5 -step decade control on the
front panel, together with a continuously
variable control, lets you set any desired
frequency, at an accuracy of ±5% of
full -scale.
Maximum output level is 20 volts P -P.
This can be adjusted to whatever level is
needed, by means of a three-step attenuator; Normal (0 dB), -20 dB and
-40 dB. A continuous attenuator is also
provided for fine adjustment. The DC
level of the output signal can be adjusted,
positive or negative, by the Offset control. Range of DC offset is ±10 volts
open-circuit, ±5 volts into 600 ohms.
The waveform desired is selected by a
switch on the panel.
More interesting features are found
on the rear panel. By the use of the FM
jack, the signal can be frequency -modulated. Feeding a signal into the VCO jack
changes the frequency; this stands for
voltage controlled oscillator. A square
wave fed into this will make the Mk. 1
generate a series of "bursts" of high frequency, separated by short periods of
much lower frequencies. A ramp waveform, going from 2 volts to 12 volts,
with the Frequency dial set at "1 ", will
linearly increase the frequency by 10:1.
These can also be used as outputs, for
working with TTL circuitiry.
The ACS Mk 1 is a new development
in function generators. Previous types
have been quite bulky, and more than
quite expensive. Due to the use of IC's,
this unit can be sold at a price that
makes it available to the rest of us! It
can be bought in kit form, for still more
savings. While these have always been
considered lab instruments in the past,
signal generators of this type could well
be very useful in service shops and
smaller schools. Especially so in shops
doing hi -fi work. A source of low -distortion signals over such a wide range is
R -E
always a useful tool.
Hickok Model 270
Function Generator
I l
((IlrlILI .I
Circle 92 on reader service card
IF YOU SAID TO MANY TV TECHNICIANS,
"Hand me that function generator," you
wouldn't get it. In fact, you wouldn't
have gotten it from the average technical
writer of this column either up until a
while ago. However, if you said "Hand
me that versatile audio -frequency signal
generator with sine, square and triangle
INTERNATIONAL
FM 2400CH
II[
ID
waveform outputs, plus a lot more,"
you'd get a function generator. It would
be a Hickok model 270, in fact. This
started out as a lab instrument, but we
won't go into that. What we do want to
cover is the numerous things that an instrument like the model 270 can do in
the typical electronics service shop
This little instrument is useful in audio
FRRuENa
MEhR for test
mobile transmitters
and receivers
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
The FM- 2400CH
provides an accurate
frequency standard for
testing and adjustment of
mobile transmitters and
receivers at predetermined
frequencies.
The FM- 2400CH with its extended
MHz. The range covers 25 to 1000 frequencies can be those
of the radio frequency channels of operation and /or the intermediate"
frequencies of the receiver between 5 MHz and 40 MHz.
Frequency Stability: ± .0005% from +50° to +104°F.
Frequency stability with built-in thermometer and temperature
corrected charts: ± .00025% from +25° to +125° (.000125% special
450 MHz crystals available).
Self-contained in small portable case. Complete solid state
circuitry. Rechargeable batteries.
$595.00
FM- 2400CH (meter only)
24.00 ea.
crystals (with temperature correction)
18.00 ea.
crystals (less temperature correction)
catalog price
IF crystals
RF
RF
Write for catalog!
INTERNATIONAL
CRYSTAL MFO. CO., INC.
10 NO LEE
Circle
12 on
www.americanradiohistory.com
OKLA. CITY. OKLA. 73102
reader service card
25
and radio, and also in many tests for
TV circuits. I found a whole lot of things
that I had always wanted to do, but never
could. Handy, fast and accurate tests that
can help speed up service work in a great
many areas.
The sine and square waves are already
familiar to us. The sinewave output of
the model 270 has less than 1% distortion up to at least 20 kHz. The rise -time
of the square wave is 0.5 microseconds
or less. In addition, the model 270 will
go up to at least 500 kHz with little distortion. So, you can feed a square wave
into a video amplifier stage and check it
for frequency response, ringing, delay,
and so on.
The new one is the triangle waveform.
This is very handy for checking gain linearity of amplifiers, and even oscilloscopes. Clipping is very easy to spot;
easier than with a sinewave, even! Also;
if the amplifier has any distortion, this
shows up as a bend or warp in the
straight sides of the triangle!
The nuts and bolts features of the
model 270 are really simple. The frequency is controlled by a main dial calibrated from 1 to 10. The operating frequency range is determined by 6 pushbuttons. Ranges start at 1.0 Hz to 10 Hz,
and go up in order to an upper frequency
of 1.0 MHz. All you do is multiply the
dial reading by the figure on the button.
For example, on the X 10 range, a dial
setting of 5 gives you 50 Hz.
A variable attenuator gives you fine
le%// atic
control of the output level. There are
also three fixed pushbutton atteunators,
0 dB, -20 dB and -40 dB. You can
get up to -80 dB of attenuation by using
both the knob and the pushbuttons.
(Note: at least one of the attenuator
buttons and one of the waveform buttons
must be down. If they aren't, no output.
Ask me how I found out.)
The controls are arranged very conveniently, so that operation of the instrument is simple. The dial is marked in
white figures on a black background
easy to read. It is AC- powered and
comes on instantly. There are many
other special tests that can be made with
the model 270. These are hooked up to
a printed- circuit card connector on the
back panel. You can get PSK (Phase
Shift Keying), FSK (Frequency Shift
Keying), AM modulation where an external signal is modulated by the 270's
output frequency or vice versa, and FM
keying. You can even fed another signal into the rear connector and use the
270 as a mixer, you'll get the sum of the
two signals at the output terminals. This
lets you make intermodulation distortion
tests very quickly. Many other tests can
be made, the instruction manual has full
details.
The model 270 does all of these things
with one huge (!) IC; not physically big,
but electronically big. The DC power
supplies are electronically regulated. This
enables it to have a very good stability
rating for both frequency and amplitude
-
calibration. Something less than 0.1%
under line voltage or temperature variations.
One of the "Things I always wanted to
do but never could" is an audio sweep.
All you need is a source of a low AC
voltage; a 6 -volt filament transformer or
the 6 -volt filament from your tube -tester.
Hook a small pot (100 -500 ohms,) right
across this. Now, connect the voltage
output and the common to the FM terminals on the back of the model 270. The
hot side must be connected through a
blocking capacitor, somewhere around
0.5 to 1.0 , F.
Varying the AC voltage will now make
the 270 sweep the dial frequency both
ways from the indicated frequency. The
amount of voltage controls the range of
sweep. Feed the regular output terminals
to the input of any audio amplifier. If
you scope the input with one channel of
that new dual -channel scope, you'll see
that this is absolutely flat. Now hook the
other channel to the output of the amplifier, and there you are. You will usually
see the zero -beat point in the center of the
screen, with the frequency going up in
both directions. This too should be flat.
The chances are that it won't be, at first.
You can see the actual effect of both the
bass and treble control settings. Somewhere in there you should be able to find
a point where the output is flat. If so,
you've got a good amplifier. You can use
any of the three output waveforms for
this, but I like the sinewave best. You
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literature and name of my distributor.
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can check the effect of the bass-boost
controls and anything else in the amplifier.
By raising the center frequency of the
sweep, you can make sweep- frequency
tests of radio IF stages, and even on
RF stages up to 1.0 MHz. Just hook the
scope to the output of the detector,
sweep it at 60 Hz and away you go. This
was a feature of the old Hickok 288 RF
signal generators of long ago (and still is.
I have one on my bench that is used for
this job today.) You can spot regeneration
or any other problem in an IF stage in
short order. This is a place where you
can use that old recurrent -sweep scope.
Its frequency response will be ample for
this kind of work.
The wide frequency coverage of the
model 270 makes it possible to do tests
in video stages. Hook the output to the
video detector output or video amplifier
input and adjust the frequency to make
the pattern you want. Use a square wave
for this and you can make any number
of vertical bars on the TV screen. You
can get down to only a single bar that
gives you a half-black, half -white screen.
Very handy for checking overshoot, ringing and horizontal smear in the video
amplifier. The triangle waveform will
show a gradually shaded pattern from
the edge to center.
By feeding a square wave external signal into the AM modulation terminal on
the back panel, you can generate "tone burst" signals at any frequency you want.
,elelna,K
Air
This is often used to check hi -fi systems
for response to sudden peaks of signal,
and so on. Incidentally, you can use your
old audio generator for this if it has a
square wave output. If it doesn't, you
can make up a clipper with a couple of
diodes that will give you an acceptable
square wave for the modulation, or I
should say keying. Takes only a very
small signal to do this.
You will find many other tests that
you can make with this versatile little
instrument. Read the instruction book for
details.
Fitting right in with present conditions,
the model 270 doesn't cost an arm and a
leg, for an instrument of its quality and
R -E
precision.
Co., Inc., Box 547, Reston, VA 22090. t89 pp.
9 x 6 in. Hardcover
This volume explains and illustrates the
field of linear integrated circuits in :luding
IC's.
op -amps and all other forms of linen
It offers a thorough discussion of the underlying principles strengthened by a host of
BASIC ELECTRICITY AND AN INTRODUCTION TO ELECTRONICS, Third Edition, by
the Howard W. Sams Editorial Staff. Howard
W. Sams & Co., Inc., 4300 W. 62 Street, In-
$4.95.
Here is a balanced blend of t yristor
theory and practical circuits using readily
available low-cost SCR's, triacs arc diacs.
The volume contains complete easy-c- understand operational theory applicable to all the
basic thyristor devices: the SCR. 11e programmable unijunction transistor, the diac
and the triac itself. As the theory begins to
dianapolis, IN 46268. 208 pp. 103/4 x 8'/4 in.
Softcover $5.95 (in Canada $7.25).
From beginning to end, this book appears
to have been written for the student and beginner who sees a bright future in electronics and wants to learn more about it.
It begins with a description of the composition of matter and the role of the electron.
Progressing in an orderly fashion, the text
lays the foundation for each new subject
from the structure of atoms to basic circuits
in the important science of electronics. R -E
MANUAL OF LINEAR INTEGRATED CIRCUITS, by Sol D. Prensky. Reston Publishing
como
p.
DflL
application schematics. In additbi there
is a comprehensive selection gu ce and
cross -references for IC type numbers There
is also a complete section on breaclooarding and testing techniques. As a 3 actical
presentation of basic principles, tbi a are
more than 100 application schena:i:s and
the cross -reference index descritts well
over 300 manufacturers type nutters with
identifying codes for second source 'ypes.
PRACTICAL TRIAC /SCR PROJECT à FOR
THE EXPERIMENTER, by Richard Fcx. TAB
Books, Blue Ridge Summit, PA 17214. 192
pp. 8'/2 x 51/4 in. Hardcover $7.9tá; Softcover
fall into place, the reader will fiat himself
using thyristors for myriads of Iktie lobs
around the shop, for variable contro of line
voltage or on -off switching of hig,-current
loads or control of AC loads. Perhaps he'll
even want to build the light organs. Written
for both the technician and advances hobbyist, the book assumes a basic knowledge
with respect to the basic fundan.ltals of
R -E
semiconductor circuitry.
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of my distributor_
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I
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Portable Digital
Multimeter at an
Analog
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less batteries and optional
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reasons why our
new meter should
be your next:
9
1.
ANALOG PRICE
2. RELIABLE
Fully overload protected
Built -in battery check
Impact- resistant Cycolac"
case
3. EASY TO READ
Large 3 -digit LED readout
Automatic polarity, decimal
point and out-of -range
indication
4. COMPLETELY PORTABLE;
USE IT ANYWHERE
Only 4.38 x 6.38 x 2" deep
5.
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Operates from 4 ordinary
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adapter /charger
HIGH -LOW POWER OHMS
Measures accurately in solid
state circuitry
HIGH RESOLUTION
1mV, 1 /iA, 0.1 ohm
DIGITAL ACCURACY
DC volts typically 2 1%
F.S.; AC volts and ohms
typically 2% F.S. except
±2.5% on highest range
RANGES
DC and AC volts, 0 -1, 10,
100, 1000V;
MODEL 280
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1
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9. IN STOCK AT YOUR
PRODUCTS OF JYNASCAN
1801 W.
DC and AC current, 0 -1, 10,
ßiJILI)
this COLOR
TV CAMERA
for about S400
Having only two channels of video, this camera
produces remarkable color pictures. Any amateur or
experimenter can build it for about $400
by GARY DAVIS
INCREASING INTEREST IN CLOSED -CIR-
cuit TV and the public acceptance of
color have created a need for a low cost color camera. A complex, high quality broadcast color camera can
cost $90,000 or more. Although recent
developments have brought the cost
down for educational and industrial
use, prices are still out of range for
most amateurs and experimenters.
The camera described in this article
was developed on the premise that an
advanced experimenter or amateur
could build a color camera without
getting into extremely complex mechanical, optical, or electrical problems. All parts are easy to obtain. The
two vidicon tubes are standard low cost black and white types. Color filters are low -cost and available at any
glass company. To keep the cost,
weight, and size to a minimum, a
small black and white TV set is used
to supply all voltages and scanning
signals to the camera head. The camera uses only 12 transistors in addition
to the black and white TV set. The
optical system is extremely simple.
The cost of the camera, excluding the
case, is approximately $400.
Color processing
There is a little known process of
using only two colors instead of three
to generate color images. This theory
dates back to 1914 when William F.
Fox and William H. Hickley patented
a color motion picture process involving a red filtered scene shown alternately with a green filtered scene projected in black and white only while
the red filtered scene was projected
through a red filter. The effect was
later independently re- discovered by
Dr. Edwin H. Land in 1955. This
phenomenon has since become known
as the Land Color Theory after articles
by Land appeared in the proceedings
of the National Academy of Science
in 1959 and the May, 1959 issue of
Scientific American. Dr. Land found
that the human eye can perceive scenes
in full color when the image is filtered
through long- and short-wavelength
filters, then recorded separately on
black and white photographic film.
To recover the scene in lull color,
it is then only necessary to project the
scene recorded on the two separate
photographs, with a long wavelength
light source illuminating the ling wavelength photograph, and a short wavelength light source illuminating the
short wavelength photograph. In
Land's process, the colors in the scene
arise not from the choice of wavelengths, filters, or overall )rightness
levels, but rather from the interplay
of longer and shorter wavelengths over
the entire scene.
My camera system is imilar to
Land's process. The two calor filter
wave lengths correspond to the wave
length or combination of wa""e lengths,
generated by the three illuminating
phosphor colors in a conventional
color picture tube. The filter for the
long wavelength image, mitered at
29
www.americanradiohistory.com
approximately 650 millimicrons, is
red. The short wavelength filter, centered at approximately 475 millimicrons is cyan, a bluish-green. In effect
the two color channels are a corn bination of the three primary colors.
Inputs to the green and blue color
difference amplifiers of the color monitor are combined, allowing the blue green phosphor dots to produce cyan,
corresponding to the cyan or short
wavelength filter in the camera head.
The red color difference amplifier and
the red phosphor dots of the color
monitor handle only the signal from
the red or long-wavelength tube.
Colors hold true over a wide range
of different red, green and blue images
due to the interplay of the red and
cyan signals. In fact, the only camera
operating color controls are the red
and cyan lens iris adjustments. The
receiver contrast control may also
have to be re- adjusted depending upon
lighting conditions. The color receiver
tint and color -level controls have no
effect in this arrangement since the
signal is not encoded to a NTSC
signal.
Tests indicate that NTSC color encoding can be done by feeding the
cyan signal to the combined blue and
green color inputs, and sending the
red to the normal red input of a commercial NTSC color encoder. With
this arrangement, the camera output
could be video taped or transmitted
by a ham TV transmitter.
Extensive testing of both the conventional three -tube color system and
the simpler two -tube system indicates
of course, that the two -tube system
cannot duplicate three -tube performance in all respects. The main difference being some averaging of colors
along the junction point of the blue green spectrum, some difficulty with
LENS
CUBE
PRISM
LENS
RED
FILTER
shades of yellow and some hues of
magenta. However, the system produces surprisingly good color. The
colors are rich and vivid. Blues are
blue, greens are green, and reds are
red. Complex colors such as skin
tones, browns, hair colors, etc. are
reproduced well.
The advantage of using only two
tubes instead of three, at least for the
home experimenter or low -cost application, far outweighs the relatively
minor additional color discrepancies
encountered with the two -color process. These advantages include:
Camera registration, the art of
overlapping images to perfectly
coincide, is much simpler.
The camera can be built with
one -third less parts.
Camera sensitivity is greater since
light must be divided only two
ways instead of three.
Optics are much simpler allow-
ing the use of a simple cube prism
to split the incoming light in two
directions.
How it works
Figure 1 is a block diagram of the
entire camera system. Light from the
scene first passes through a cube prism.
The prism itself absorbs approximately
40% of the light. Approximately 50%
of the remaining light is bent 90 degrees to the red lens. The prism is
available from Edmunds Scientific Co.
The cyan camera lens gets a straight
through view of the scene. Both camera lenses are Cosmicar 25 mm, available from Denson Electronics Corp.
The prism must be placed before the
objective lens so the glass in the prism
won't affect the focal length of the
lens. The color filters are placed between the lens and vidicon face plate.
The cyan filter consists of two layers
of Plexiglas green No. 2414. The red
HORIZ, VERT SCAN,
BLANKING, -12V, +300V, 6.3 VAC
CYAN
FILTER
r
/
Close -up view of one of the preamplifier circuits that are mounted over the vidicon tubes.
o
B/W TV
VERT
-
MONITOR
PULSE
CYAN
TUBE
O
O
O
o
I
L
V
I
RED
PREAMP
1
CYAN
PREAMP
Y LUMINANCE
RED
TUBE
1
HORIZ PULSE
SYNC
CLIPPER
CYAN
AMPL
RED
AMPL
111.
G
RED FILTER PLEXIGLAS #2423,1 LAYER THICK
CYAN FILTER PLEXIGLAS #2414,2 LAYERS THICK
PRISM #41211 EDMUND SCIENTIFIC CO.
FIG.
1
OR N.T.S.C.
SYNC
-BLOCK DIAGRAM of the camera head. Operating voltages and sync signals are
supplied by
a
COLOR TV
MONITOR
black- and -white TV receiver.
www.americanradiohistory.com
IE
B
ENCODER
o
O
O
O
o
filter is Plexiglas red No. 2423, one
layer thick. Both yoke and focus coil
assemblies are available from Denson
Electronics. This assembly also contains the alignment magnets which are
used to register the two images. These
yokes are built to very close tolerances
and register well. Don't be tempted to
substitute another type of yoke.
Again, referring to the block diagram, the black and white TV feeds
horizontal, vertical, scan, blanking,
-12 volts, +300 volts, and 6.3 VAC
to the camera heads. The output of
the cyan vidicon is fed to the cyan
preamp. A vertical sync pulse is added
and the video amplified to approximately I volt VP -P. This output also
forms the luminance signal and is fed
to the color monitor's luminance amplifier to provide the black and white
information. The cyan preamp also
feeds the cyan amplifier where the signal is inverted and raised in amplitude
and
to drive the grids of the G
amplifiers. The grids are couB
pled together with a .5 N.F capacitor.
The cyan preamp output is also fed
to the sync clipper where the vertical
sync pulse is inverted and sent to the
color monitor's sync separator. The
horizontal sync pulse is fed separately
to the sync clipper in order to prevent
contamination of the blue and green
amplifier in the monitor. The red pre amp output drives the red amplifier
ampliwhich in turn drives the R
fier. The sync clippers, cyan amplifier,
red amplifier and a -18 volt power
supply are located in the color monitor
so that all signals may be sent to the
color monitor on a single 4- conductor
-Y
-Y
-Y
from sheet metal.
LAYOUT OF THE CAMERA HEAD is shown. Camera case was constructed
cable. A multi -conductor cable is used
between the black and white TV set
and the camera head. This 2 -piece
configuration also allows the camera
to be used hand -held. The camera
head weighs 18 lbs.
Many camera builders will want to
include the small black and white TV
in the camera case to act as a view
finder. The horizontal sync will have
to be re- applied to the TV sync sep erator for operation as a view finder.
CLOSE -UP VIEW of
camera head shows
details of layout and
optic system.
Do not use an AC -DC type TV with
this project because of the stock hazard involved. A square sun shade on
the front of the camera prevents stray
light from striking the prism in bright
sunlight. Paint the inside of the camera case black. The camera case is not
commercially available and may be
constructed out of sheet aluminum.
I found the easiest method of
mounting the parts for mechanical
alignment is to build each camera
head as a separate unit. After both
heads are tested and ope rate correctly, lay both heads and he prism
on a wood mounting board. The camera is initially registered anc adjusted
mechanically, optically, and electrically while laying on its side. Remember, for good registration, every optical
and electrical parameter-fo:al length
distance, scan amplitude, yoke alignment, optical and electrical focus adjustments -must exactly match the
other channel. Finally, when all electrical adjustments and tests are complete, screw down the heads a.nd mount
the prism. The whole camera assembly
is then placed inside the camera case.
All camera tests and regist -ation adjustments are made using a standard
TV test pattern with a series of vertical
color stripes glued to the top of the
test pattern. The colors I u'e are red,
orange, yellow, dark green, light blue,
dark blue, and magenta.
Next month we will cove: the camera heads, circuit details, m Ddification
of the two TV sets, adjustments regR-E
istration, and final check cut.
L
C
CO
V
31
www.americanradiohistory.com
.®
b
Radio-Electronics®
a
OA(On(
t1 000
Tests Sansei QRX -6001
by LEN FELDMAN
CONTRIBUTING HIGH -FIDELITY EDITOR
THE SANSUI QRX -6001 4- CHANNEL RECEIVER
is one of two versatile quadriphonic all in -one units introduced by that firm dur-
ing the past year. The two units differ
primarily in their output power- ratings,
with the more powerful QRX -7001 selling for $120.00 more than the unit reviewed here and delivering 10 additional
watts- per -channel, according to published
ratings. Both units have every needed
facility for handling all 4- channel material, including QS (developed by
Sansui), SQ (the matrix system promoted by CBS) and so- called "discrete ",
and CD -4 records (jointly developed by
JVC and RCA.)
An overall view of the front panel
is shown in Fig. 1. The softly illuminated
dial scale area contains both a center -ofchannel tuning meter and a signal strength meter. Above the linearly
calibrated FM frequency scale, illuminated words appear to denote stereo FM
reception as well as the many modes of
quadriphonie listening. An indicator light
at the right of the frequency scale displays a large numeral "2" or "4" depending upon user's selection of 2- channel or
4- channel listening. Detailed views of the
left and right sections of the front panel
are shown in Figs. 2 and 3.
Pushbutton switches handle power on/
off, 2- channel stereo selection (with an
optional choice of having the back
speakers reproduce the same material as
the front pair), synthesized quadriphonie
listening (from stereo program sources),
QS, SQ and discrete 4- channel modes.
Three screwdriver adjustable recessed
controls are used to set up the CD -4
demodulator circuit to match phono
cartridges used with the receiver and a
test record is packed with each receiver
for this purpose. The lower section of the
front panel contains nine rotary controls
(including speaker switching of main, remote or both, dual concentric pairs of
bass and treble controls for front and
rear channels, balance controls for left right and front -back adjustment, a master
volume control and a program source
selector switch) and four more pushbuttons for loudness compensation, two
tape monitoring circuits and selection of
auxiliary inputs which are independent
of the setting of the main rotary selector
switch. A pair of phone jacks (for connection of stereo or 4- channel headphones) are located adjacent to the
speaker selector switch.
Details of the rear panel are shown in
Figs. 4 and 5. A diagram that shows
the variety of equipment with which the
QRX -6001 is designed to operate is in
Fig. 6. A pivotable AM ferrite bar antenna is also located on the rear panel
and is usually sufficient for most receiving sites.
Circuit configuration and features
The FM front -end of the receiver contains a dual -gate transistor (FET) used
as an RF amplifier. A four-gang capacitor tunes in the FM stations. Two sections serve as interstage tuning between
RF amplifier and mixer stages. The FM
1.F. section contains five integrated circuits, six bipolar transistors and multiple
dual -element ceramic filters. The CD -4
demodulator circuit uses 24 transistors,
2 IC's and 6 FET's. Tone controls are
TABLE
I
RADIO- ELECTRONICS PRODUCT TEST REPORT
Manufacturer
Sansui
Model
#QRX-6001
FM PERFORMANCE MEASUREMENTS
SENSITIVITY, NOISE AND
FREEDOM FROM INTERFERENCE
IHF sensitivity, Mono: (AV)
Sensitivity, Stereo (AV)
50 dB quieting signal, Mono (AV)
50 dB quieting signal, Stereo (AV)
Maximum S/N ratio, Mono (dB)
Maximum S/N ratio, Stereo (dB)
Capture ratio (dB)
AM suppression (dB)
Image rejection (dB)
-F rejection (dB)
Spurious rejection (dB)
Alternate channel selectivity (dB)
I
FIDELITY AND DISTORTION MEASUREMENTS
Frequency response, 50 Hz to 15 kHz ( ±dB)
Harmonic distortion, 1kHz, Mono ( %)
Harmonic distortion, 1kHz, Stereo ( %)
Harmonic distortion, 100 Hz, Mono ( %)
Harmonic distortion, 100 Hz, Stereo ( %)
Harmonic distortion, 6 kHz, Mono ( %)
Harmonic distortion, 6 kHz, Stereo ( %)
Distortion at 50 dB quieting, Mono ( %)
Distortion at 50 dB quieting, Stereo ( %)
STEREO PERFORMANCE MEASUREMENTS
Stereo threshold (AV)
Separation, 1 kHz (dB)
Separation, 100 Hz (dB)
Separation, 10 kHz (dB)
R -E
R -E
Measurement
Evaluation
good
acceptable (see text)
good
acceptable
very good
good
good
acceptable
very good
excellent
good
very good
2.2
30.0
3.8
50
70
62
1.5
55
75
90
80
73
+0.5, -2.0
0.3
0.45
0.2
0.6
0.4
1.3
0.6
1.2
30.0
33
31
31
good
good
very good
very good
good
very good
acceptable
very good
acceptable
poor
good
good
excellent
MISCELLANEOUS MEASUREMENTS
Muting threshold (AV)
Dial calibration accuracy (± kHz @ MHz)
30
100 @ 108
poor (see text)
very good
EVALUATION OF CONTROLS,
DESIGN, CONSTRUCTION
Control layout
Ease of tuning
Accuracy of meters or other tuning aids
Usefulness of other controls
Construction and internal layout
East of servicing
Evaluation of extra features, if any
good
very good
excellent
good
very good
good
very good
OVERALL FM PERFORMANCE RATING
good
32
www.americanradiohistory.com
-
LEFT SECTION OF FRONT PANEL includes meters,
speaker selector, two phone jacks, and two sets of tone controls.
FIG. 2
FIG.
3
-RIGHT
SECTION OF FRONT PANEL includes 2- channel/
and main or auxiliary input selector.
4- channel mode indicator,
Pushbuttons just below the dial scale selects the various
nel decoding modes.
4 -chan-
TABLE II
c
RADIO- ELECTRONICS PRODUCT TEST REPORT
Manufacturer
Model
Sansui
#ORX -6001
AMPLIFIER PERFORMANCE MEASUREMENTS
POWER OUTPUT CAPABILITY
RMS power /channel, 8 -ohms, 1 kHz (watts)
RMS power /channel, 8 -ohms, 20 Hz (watts)
RMS power /channel, 8 -ohms, 20 kHz (watts)
RMS power /channel, 4 -ohms, 1 kHz (watts)
RMS power /channel, 4 -ohms, 20 Hz (watts)
RMS power /channel, 4 -ohms, 20 kHz (watts)
Frequency limits for rated output (Hz -kHz)
DAMPING FACTOR, AT
8
R -E
Evaluation
good
very good
very good
see text
see text
see text
excellent
26
25.5
N/A
N/A
N/A
18-24
0.065
excellent
0.11
very good
vary good
good
0.07
0.09
OHMS
PHONO PREAMPLIFIER MEASUREMENTS
dB)
Frequency response (RIRA
Maximum input before overload (mV)
Hum /noise referred to full output (dB)
(at rated input sensitivity)
HIGH LEVEL INPUT MEASUREMENTS
dB)
Frequency response (Hz -kHz,
Hum /noise referred to full output (dB)
Residual hum /noise (min. volume) (dB)
12
acceptable
1.0
250
63
very good
superb
very good
15-30,
82
1
86
TONAL COMPENSATION MEASUREMENTS
Action of bass and treble controls
Action of secondary tone controls
Action of low frequency filter(s)
Action of high frequency filter(s)
COMPONENT MATCHING MEASUREMENTS
Input sensitivity, phono 1 (mV)
Input sensitivity, auxiliary input(s) (mV)
Input sensitivity, tape input(s) (mV)
Output level, tape output(s) (mV)
Output level, headphone jack(s) (V or mV)
excellent
excellent
very good
See Fig. 9
good
N/A
N/A
N/A
N/A
N/A
N/A
2.34
95
100
100
N/A
EVALUATION OF CONTROLS,
CONSTRUCTION AND DESIGN
Adequacy of program source and monitor switching
Adequacy of input facilities
Arrangement of controls (panel layout)
Action of controls and switches
Design and construction
Ease of servicing
OVERALL AMPLIFIER PERFORMANCE RATING
(NA = Not available, or non -applicable)
R -E
Measurement
32.5
DISTORTION MEASUREMENTS
Harmonic distortion at rated output, 1 kHz ( %)
Intermodulation distortion, rated output ( %)
Harmonic distortion at 1 watt output, 1 kHz ( %)
Intermodulation distortion at 1 watt output ( %)
the familiar Baxandall feedk ck type.
Relay and terminal protection is provided
for the power output sections. each of
which is direct -coupled to the speakers
in a complementary -symmetry rcuit. In
addition to the relay protection circuitry,
each output line is fused, but fuses can
be reached only by removing he wood
cabinet.
The most sophisticated circuitry in this
receiver is probably the QS -V a riomatrix
decoder. Three IC's form the heart of
this decoder circuit and it provides up to
20 dB of separation in all directions
when reproducing QS encoded matrix
4- channel discs. By changing the coefficients of the matrix it is also adapted to
the QS format.
Equally interesting is the newly de-
Y
good
very good
excellent
very good
good
very good
veloped "synthesizer" circuit ieveloped
by Sansui. This circuit, in erect, "encodes" ordinary stereo programming,
making it more suitable for QS 4 -channel decoding by the QS- V,riomatrix
circuit just discussed. While mast stereo
programs produce an interesting; "4 -channel effect" when played through any
matrix decoder, the "synthesize r" circuit
enhances this effect significantly.
FM tuner measurements
Results of our FM performance measurements are in Table I. Stereo sensitivity, which seems quite poor upon first
glance, is really a function of he mono to- stereo switching thershold of the
tuner section. Since this switch ng occurs
at a rather high 30 microvo -s, to all
intents and purposes that is t:re "stereo
sensitivity" of the receiver Muting
threshold in our view, is als_i set too
high (at 30 µV) and what's more, because of the arrangement of thr function
switch, muting can only be defeated (for
tuning to those "weak signals") when
the switch is set to the mono position.
This insures that weak stereo signals will
not break through the muting barrier,
but prevents users from D?C'ing for
distant stereo signals -howe ,er noisy
they might be. Overall performance
rating of the FM section rr ight have
merited a "very good" or ever an excellent (instead of the "good" assigned)
were it not for this limitation.
33
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FIG 4 (above) -RIGHT SECTION of rear panel.
FIG. 5 (right)-LEFT SECTION of rear panel.
OUTDOOR
CH OR 2 CHI
14
MAIN
FRONT SPKRS
2ND TAPE
DECK
FM ANTENNA
REMOTE
- - - LOUDNESS
FRONT SPKRS
111111
1
1111
INDOOR
1
FM ANTENNA
LEFT
RIGHT
LEFT
RIGHT
110 11111111111111!=111111
rliil C11111111 Wíu111IIE1111I11
I
Mig!!11!! Zd1N!!1511111111111
Eíi11 ñ:31111111 1E111111
=111 I %1111I 111101111111111111
:ít 111101111111 11111111 1111III
1111
-10
15
0 0 000 0 0
20
FIG. 7
F-1
o):
In
TURNTABLE
LEFT
TAPE DECK
CH OR 2 CH)
MAIN
REAR SPKRS
FIG. 6 -THE VARIOUS components that can
be connected to the Sansui ORX -6001 are
shown.
REMOTE
FRONT SPKRS
Amplifier performance measurements
are listed in Table II. Since Sansui chose
not to provide an FTC approved power
rating for 4 -ohm operation, no power
output measurements were made with 4
ohm loads, nor can we vouch for unconditional stability at 4-ohm load operation
with full power delivered continuously.
At 8 ohms, however, the amplifier generally exceeds its ratings by a fairly
wide margin. For example, at 25 watts
per- channel output, THD and IM distortion measured only 0.065% and 0.11%
respectively for mid -frequencies and distortion readings were still well below
the rated 0.5% even at the frequency
extremes of 20 Hz and 20 kHz. Tone
control range and loudness control action
(measured at -30 dB below full rated
output) is shown in Fig. 7 and conforms
to expectations. Sansui elected to boost
both treble (moderately) and bass in
their loudness circuitry. Listeners who
10K 20K
1K
FREQUENCY -Hz
BASS, TREBLE AND LOUDNESS
TABLE Ill
RADIO -ELECTRONICS PRODUCT TEST REPORT
Amplifier performance
measurements
34
RIGHT
1N
14
-
100
prefer only bass enhancement at low
listening levels would be better off using
the tone controls rather than the "fixed"
loudness compensation circuitry for that
purpose.
While our hum measurement in
"phono" falls short of the 70 dB claimed
by Sansui, we suspect that their measurement is made using some form of weighting curve, whereas ours is measured
(continued on page 64)
SANSUIORX 60001
RIGHT
20
control range, Sansui ORX -6001.
OO
0000000 0 000 0
LEFT
1
111111
5
O
-30dB REFERENCE
11111111111111111111
1111111111 E111111E111111
+20
+15
+10
+5
o
111111
IIII
111111
@
III11
11111
I1II
OVERAL PRODUCT ANALYSIS
Manufacturer
Sansui
Model
Retail Price
Price Category
Price /Performance Ratio
Styling and Appearance
Sound Quality
Mechanical Performance
Comments:
#QRX -6001
$759.00
Medium -high
good
excellent
very good
very good
The Sansui QRX -6001 4-channel receiver is designed to favor its use as a quadriphonic component. QS- Variomatrix performance has been
refined to the point where, with proper program
material, separation is virtually as good as that
obtained from discrete sources. Recognizing that
other 4- channel program sources exist, Sansui has
finally incorporated a good CD-4 demodulator
circuit, as well as semi -logic in its SQ matrix
decoding (not as effective for SQ listening as
the Variomatrix QS circuits are for QS records
and broadcasts, but certainly better than earlier
non -logic equipped SQ decoders). With a good
antenna (or in strong signal areas) the high stereo
threshold will pose no problems. Power output is
ample for even moderately low- efficiency speaker
systems, but stay away from speaker systems that
require more than 20 watts minimum.
www.americanradiohistory.com
Test Equipment
for Industrial Servicing
Here's a roundup of industrial test equipment, offering many
special features and accessories. This equipment is used
in automotive, marine, aircraft and many other applications
by JACK DARR
SERVICE
FIRST THERE WAS ELECTRICITY AND THEN
came electronics. They were considered
as separate disciplines for quite a while.
There was some basis for this. Electrical
work involved high voltages and currents, and heavy machinery. Electronics
was confined to little radios. Now, we
find electronic controls on all kinds of
electrical machinery, and the twain have
met again.
They were never truly separate. I refuse to belabor the obvious point that
electronics training begins with a solid
foundation in basic electricity. Also, all
electronic tests are made by reading
electrical quantities; volts, current, etc.
So, technicians working in this field could
call it "electronicity" or something
equally silly. The equipment covered here
will be intended for industrial use; everything but "entertainment electronics"
radio, TV, audio. This includes industrial,
appliance, automotive, aircraft, marine,
and many others.
The instruments
The speed and accuracy with which
we do the job depends on our instrumentation. We work with quantities which
cannot be seen or heard (though they
can be felt, in certain cases. Also smelled). The first test instrument was a
D'Arsonval DC milliammeter. We shunted
this and got an ammeter. Adding multiplier resistors gave us a DC voltmeter.
Adding rectifiers we got an AC voltmeter.
With a little switching, we could put all
this in the same case, and the volt -ohm
ammeter was born. There was only one
thing we couldn't read with ease; alternating current. None of the early VOM's
had any way of reading this.
Things have changed. The test equipment manufacturers are making it easier
and easier for us. They are giving us
simpler, specialized test instruments to
get the readings we need a lot faster.
They're compact, rugged, and have an
accuracy that would have been unbelievable about 20 years ago. This article will
be an admittedly incomplete rundown
on some typical units in this field. We'll
show you the latest units from three of
the older companies. This is equipment
that is available now, off the shelf.
Things that can help us get the job done
fast.
The VOM's
The basic unit in most of these testers
VOM that the old timers
is a VOM
wouldn't recognize! Most of them use
20,000 ohms-per -volt movements. Some
use FET amplifiers for even greater sensitivity. Quite a few of these are very compact; "shirt- pocket" types. The rest are
the old "standard" size. They are available in special carrying cases, made of
tough plastic. These are heavily padded
with foam plastic, and have pockets for
the various accessories, test leads, and
so on. They look like expensive attache
cases; very neat.
They're all well -protected against accidental damage, physical or electrical.
The VOM's are built into high-impact
plastic cases. Electrically, all of the
meters have protective diodes to save the
movement from surges or inadvertent
overloads. Many are also protected by
special fast -blow fuses (bless their hearts),
they provide spare fuses inside the meter
case, to save you a long trip back to the
shop. One make has a special circuit breaker; a bright red button pops up on
overloads. These are about as foolproof
as possible, though probably not totally
foolproof. Somebody will invariably try
to read line voltage on the ohms scale,
or something.
Beside the standard VOM ranges, special "adapters" are available. With these,
you can read practically any quantity
you need; speed, temperature, pressure,
sound level, and on and on. You'll see
more on these as we go along.
-a
Special features
I've always been fond of test equipment that makes things easier. I believe
that the one thing that made the greatest
impression on me was the "clamp -on
ammeter." As I just said, in the early
days, you simply couldn't read alternating
current without going through a lot of
trouble. There were AC ammeters, of
course. They were about 12 inches in
diameter, weighed around 30 pounds and
cost an arm and a leg. The only place
you saw them was in power- houses. Like
all current meters up till now, you had
to open the circuit and put them in series.
Now it's a breeze; actually, a one hand operation. You can have a meter
that fits in the palm of your hand, with
DITOR
a pair of funny -looking jaws and a pushbutton. Push the button, the jaws open;
close them around any one conductor in
the circuit and presto; an inst<<nt amp
reading. As all working technicians know,
the actual load current drawn by any
kind of electrical unit is the bast indicator of its condition. Let's see tow this
handy little device does it.
Figure 1 shows how it woiks. The
TRIGGER -OPERATED
JAWS
h OVING
RECTIFIER
COIL
SHUNT
SECONDARY WI .DING
-
CONDUCTOR
AC AMMETER MEASUFES CURFIG. 1
RENT without direct electrical =inflection.
(courtesy Amprobe)
"jaws" are actually the iron c ?re of a
transformer. The conductor arts as a
one -turn primary. Another winding on
the core steps the voltage up so the
meter can read it. The changing magnetic
flux in the wire, when current i flowing,
gives us an AC voltage directl.- proportional to the amount of current flowing
in the conductor. To read currents of
different values, shunts are connected
across the meter by a selectcr switch,
usually in the clamp -on adapter unit. No
disturbance of the circuit is accessary.
The only thing you must dc is to be
sure that you have only one of the circuit conductors inside the jaws. More
than one will upset the magnetic fields,
and the reading will be incorrect. Either
conductor of a two -wire circu t can be
used. For house wiring and siriilar testing, go to the circuit breaker Lox, where
the wires are easy to get at. The instrument's jaws are well -insulated. so you
can go in without danger of shorting
anything.
For any plug -in unit, such is an appliance, special plug -in "line -splitters"
are available. These separate the conductors; they're built in plastic crises, with
a "ring" to clamp the jaws through.
Several of these are made with built -in
35
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IF YOU ARE READY FOR SERIOUS CAREER
Learn College-Level
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ADVANCEMENT NOW
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except for a brief introductory level course,
which is optional.
Unique Laboratory Program. CREI now offers
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to train you in the actual design of electronic
circuits. You also get extensive experience in
tests and measurements, breadboarding, prototype building and in other areas important
to your career. The Lab Program makes it
easier for you to understand the principles of
advanced electronics. Only CREI offers this
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The Lab Program includes professional
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You will especially appreciate the Electronic
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I
CAPITOL
RADIO
ENGINEERIN,3
INSTITUTE
McGraw -Hill Continuing Education Center
3939 Wisconsin Avenue Northwest
Washington, D. C. 20016
Accredited Member, National Home Study Council
www.americanradiohistory.com
multipliers; you can read the current
directly, or divide by 10 or by 20, for
low values of current. (I'll admit that
this was news to me, and I don't have
any details, but some people claim to be
making clamp -ons that can read DC! The
principle of operation is slightly different,
but they are just as simple to use.)
Let's look at a few typical models
starting with the ultra- compact "shirtpocket" types. Figure 2 is the Amprobe
Model YT- 25100, in their "Junior" line.
This is also an AC voltmeter; test leads
can be plugged into the case.
Figure 3 shows a higher range unit,
a 2.5 -volt AC scale, or to 500 amps with
a 5 -volt meter.
Figure 6 shows the latest version of
Special test adapters
In addition to the easy alternating current tests mentioned before, special adapters can give you readings of many different
quantities. Read temperature on a VOM?
But certainly! All you need is a plug -in
thermocouple, and a scale or scales on
the VOM calibrated in degrees Fahrenheit,
or degrees Celsius. Read speed in RPM?
Same thing. A small generator is held on
the end of a rotating shaft; it develops
a voltage proportional to the speed, and
the meter has scales to read it. Another
version uses light, chopped and read out
on a meter. No physical contact with
the revolving machinery is needed.
The government- specified safety tests
for AC leakage on any appliance can be
made. Special scales are provided on
many units. Under OSHA, this is mandatory for most appliance service work.
With these instruments, it's fast and easy.
For testing small thermocouple controls, used with gas -fired appliances,
special millivolt ranges are provided.
They start at about 50 mV and go up to
about 1.5 volts.
Light levels and sound levels, also required tests under some OSHA regulations, are equally simple. Many of the
special VOM's can do this with plug -in
sensors. For production -line or quality control testing, these can be obtained in
single- function units, for making that one
test.
For electricians working with polyphase AC lines and equipment, an adapter
is available that will identify the correct
phase- sequence of any three -phase line.
It will work up to 550 volts, and can be
used with the AC voltmeter of the VOM.
For the final touch, many of these
testers can be bought in special models
calibrated at 50 Hz for overseas work,
or at 400 Hz for aircraft and marine
work. These are special-order types, of
6
3
the Amprobe RS -1000. This, too is a
voltammeter. It's a multi-range instrument; the scales are on a cylinder operated by the thumbwheel control of the
switch. Only the scale in use can be
seen. It will read AC current from 0 -15
amps up to the scale seen here, 1000
amps. An ohmmeter range is also provided.
For the Really Big Stuff, a special
kind of Clamp -on is used, as in Fig. 4.
7
This is the Amprobe "Amp- Tran "; it is
used with any of the RS series Amprobes.
It can read currents up to 6000 amperes.
It's used with the huge bus -bars found in
power plants and heavy industry.
5
course. All U.S. units are calibrated for
60 Hz.
the Amp- Clamp, just introduced. This is
a self- contained unit with its own meter.
There are three models, the 294, 295
and 296. The difference is only in the
ranges and functions. Test leads can be
plugged into the unit for voltage and
resistance readings. Note the little button on the side of the case. You can
hook up the Amp -Clamp, turn the machine on, and then press the button. This
locks the meter needle in place; you can
take the reading and then look at it later!
Ranges from 0 -6 amps up to 300 amps.
Figure 7 shows a familiar face. This
Going on in alphabetical order, the
Simpson Electric Co's "Amp -Clamp" can
be used with any AC voltmeter, having a
full -scale range of 2.5, 3.0 or 5.0 volts,
at 5000 ohms -per -volt minimum (Fig.
5). The current range varies with the
meter used. It'll go up to 250 amps with
40
www.americanradiohistory.com
the Triplett Model 310 Miniature
VOM, with a Model 10 Clamp -On AC
Ammeter adapter. The adapter plugs into
the top of the case and locks. This automatically makes contact with the Common jack; the test lead is then plugged
into the VOM jack, and the selector
switch set for 3 volts AC. The currentrange switching is then done by the selector switch on the Model 10 Adapter. As
you can see, this is really a "one- hand"
operation. (You can use your right hand
if you like!)
The unit shown is the original version
of the Model 310. There is a later model
just out, the 310 -Type 3. This is a dropresistant, ruggedized version, with a
textured surface on the case to make it
easier to hold.
By unscrewing the tip from the common test -lead and putting it in the end
of the case, any of the 310's can be used
"one- hand" for any kind of testing (Fig.
8). For applications needing very high
sensitivity, there is another one, the
310 -F, a FETVM. The later versions
have a very handy polarity- reversing
switch on the upper left corner of the
is
case; under the man's right thumb in
Fig. 8. This reverses the polarity of not
11
The Simpson Model 265 seen in Fig.
can read AC and DC volts, and has a
13
only the DC voltmeter but the ohmmeter;
very convenient for transistor tests.
For the last, (but not least) of the
shirt-pocket instruments in this area, Fig.
9 shows the Amprobe Model VT -100
11
low- voltage scale of 300 mV, as well as
plug -in AC and DC amperage. Current up
to 12 amps can be read.
The Triplett Model 615 in Fig. 12 is
a specialized industrial -test VOM with
many special ranges. Up to three separate
Figure 15 shows the Simpscc, 260
VOM, and one of its "family" 01 adapters. These plug into the Model :50, to
convert it to quite a variety of uses. In
addition to the Audio Wattmeter unit
9
"Volt- Probe ". It reads AC or DC voltages.
There is no meter needle! The scale
lights up to show you the voltage reading. Very useful for working in some of
the dark places we get into!
Now we come to the "standard" size
VOM's; the larger units like the Simpson
260, Triplett 630, and others. However,
in these something new has definitely
been added. These are far more versatile
than the old ones. All of the stock ranges
are provided, and many special ranges as
well, as you'll see.
In alphabetical order again, Fig. 10
shows the Amprobe Models AM -1 and
AM -2. The AM -2 is a standard VOM.
The AM -1 has the same ranges, and provision for temperature readings with a
12
thermocouple probes can be plugged in
at the same time. Any one of these can
be read by moving the selector switch.
Handy for reading input and output
temperatures, on air -conditioners, etc.
The DC millivolts ranges start at 60 mV
full -scale, and go to 1500 mV. A built in AC leakage test is included; this is the
one we're supposed to make on all appliances before delivery. With this, it
can be done with a flip of the switch.
For reading AC current, a slightly different version of the clamp -on ammeter is
used. This works exactly like the rest,
but has extension leads so that the meter
can be left on the bench. Line-splitters
and dividers are available with it.
All of these instruments are available
in special carrying cases, to hold the
basic instruments and the adapters,
10
plug -in thermocouple probe. Note the DC
"millivolt" ranges, for checking control
thermocouples.
probes, etc. Fig. 13 shows the Amprobe
Model TM -43A. The line -splitters and
extensions are strapped in the lid, and
in pockets in the case. Other instruments
in this line have their own cases, some
smaller than the one shown.
Figure 14 shows the Triplett Model
615 in its carrying case. The thermocouple probe is at the left, with the test
leads, and the AC ammeter clamp -on and
line -splitter, divider are at the right.
15
shown, there are adapters to male the
260 into a transistor tester, DC VTVM,
battery- tester, temperature tester, A2 ammeter microvolt attenuator, and even a
"milliohmmeter." The last one has a low
range of 0.1 ohm full- scale. Nok the
heavy test-leads needed to get accurate
readings in this area. Incidentally the
Simpson units shown also have the marrying cases.
Now we come to the single- funztion
testers, for specialized work. Figure 16
shows the Amprobe "Fastemp" thermometer. Three separate probes can be
used at once, with a selector switch.
This is their Model T -150. Intern - ittent
or continuous readings can be made,
(continued on page 68)
41
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IC UPDATE
Understanding
the
The operational amplifier is an important building
block to the design engineer and experimenter. This
article presents some practical circuit applications.
by DON LANCASTER
14 -pin DIP's from Motorola as a MC1458;
a quad 741 in a 14 -pin package called the
4136 is made by Raytheon; finally a
greatly improved 741 called the LM318
THE FIRST ARTICAL IN THIS SERIES AMAY
issue) described the operational
amplifier and presented 14 basic rules
needed to design around them.
This concluding article describes a few
practical devices and presents and presents some circuit applications.
1975
available from Advanced Micro Devices
and National. Condensed data for these
four devices appear in Figs. through 4.
Only the 741 and the LM318 have pins
brought out for balancing offsets -you
have to use external offsets for the rest
of the circuits. Costs vary widely, but
around 800 per 741 -style amplifier new
and half that for surplus are typical, with
the LM318 priced under $5. The LM318
is thus very much a premium device, but
anytime you need the slew rate or the
higher frequency response, it is a very
good choice. There are other moderately
improved 741 -style devices, including the
Motorola MC1741S, and several devices
is
1
Some devices
So, we now have most of the use rules
for negative- feedback op -amps, particularly the 741. Let's take a close look
at some actual devices, and then we'll go
on to some actual circuits you might like
to try or use for design.
The four easiest to use op -amps are the
741 itself, available from just about anybody (see the table). The 5558, a dual
741 in an 8 -pin can and a plastic mini DIP
is from Signetics and in a can and 8- and
by Silicon General. These are intermediate
in price and performance and generally
offer around 5 V /µs slew-rate and better
noise performance. And, of course, there
are many premium devices offering considerably better performance.
Finally, there are some other quad
amplifiers often called Norton amplifiers
or automotive op -amps. These are not
true operational amplifiers and cannot be
used in the circuits that follow. Further,
there are very serious use restrictions for
these devices. For the vast majority of
your applications, you'll find the devices
of Figs. 6 through 9 the best overall choice
to use.
Some applications
Let's turn to some applications. We'll
assume you have a good split power sup-
µ4741
5558
OFFSET
(N.C.)
N.0
OFFSET
(N.C.)
V-
DUAL -IN LINE
(TOP VIEW)
METAL CAN
(TOP VIEW)
SUPPLY VOLTAGE RANGE ±5 TO 018V
SLEW RATE 0.5 VOLTS /pSEC
NOISE 100VOLTS, 100kHz dF
DUAL-IN LINE
(TOP VIEW)
(TOP VIEW)
SUPPLY VOLTAGE RANGE: ±5 TO !18V
SLEW RATE: 0.5 VOLTS /µSEC
NOISE: 10 pVOLTS, 100kHz OF
.000
120
METAL CAN
100 000
100
1,000,000
120
m.c
BO
o
60
z
40
20
o
20
MN
10
100
IK
10K
IM
1M
10M
100
100
Ll
-IC
D
Z
1000
1
0
100M
FREQUENCY, HERTZ
1
10,000
çó
C-0
10
z C
10
C C
-
o
20
42
www.americanradiohistory.com
10
100
1K
10K
.1M
1M
FREQUENCY, HERTZ
10M
O
100
o
(above) -THE VOLTAGE VERSUS FREQUENCY characteristics of the itA41 op -amp.
FIG. 2 (right) -THE VOLTAGE VERSUS FREQUENCY characteristics of the 5558 op -amp.
FIG.
100,000
z
100M
t
-i
4136
LM318
V+
BAL COMP
(N.C.)
oldjaii) m
BAL
COMP2
2
1
wib
0000
BAL COMP 3
(N.C.)
BAL COMP
VMETAL CAN
DUAL -IN -LINE
(TOP VIEW)
(TOP VIEW)
(TOP VIEW)
SUPPLY VOLTAGE RANGE t5 TO .20V
SLEW RATE 70 VOLTS /6SEC
NOISE 3VVOLTS, 100kHz 3F
SUPPLY VOLTAGE RANGE: ±5 TO ±18V
SLEW RATE: 1 VOLT /µSEC
NOISE: 3 µVOLTS, 100kHz AF
120
1.000.000
100
100,000
1,000,000
120
O
100,000
100
80
10,000
60
1000
BO
10,000
60
1000
40
100
Z
Z
¢
u
20
m
o
Z
Q
1
(N.C.)
DUAL - IN - LINE
0
V.
(N.C.)
BAL COMP
IN.C.)
BAL
COMP 3
(N.C.)
20
40
100
20
10
1
10
1K
100
10K
IM
MM
M
1M
100M
FREQUENCY, HERTZ
(.7
o
3 AND 4 -THE VOLTAGE VERSUS FREQUENCY characteristics of the 4136 (left) and the LM318 (above) operational amplifiers. The 4136 integrated circuit contains four operational amplif sors.
The LM318 is a premium device that has additional banclw dth.
The basing diagrams for both integrated circuits are shown for
the dual -in -line and metal -can packages.
FIGS.
1
20
0
10
100
1K
10K
.1M
1M
10M
100M
FREQUENCY,HERTZ
RFB
10K
DUT
1
RIN
10K
-eIN -
RIN
10K
eIN
1K
eOUT
RFB
RIN
eIN
0
10 eIN
100K
TO
10eI N
-o
.22pF
OMIT
CAPACITOR FOR
10K
FIG. 5-THE UNITY -GAIN CONFIGURATION
of an operational amplifier. The circuit has
a voltage gain of exactly one.
RIN
10K
RIN
10K
eIN
RIN
eIN
RFB
100K
-
RFB
10K
=
UNITY GAIN
RFB
100K
eOUT
DC RESPONSE
FIG.
8- INVERTING
VOLTAGE
FC -I
I
5K
OWER
;tment
circuit. This configuration allows ail
of the gain via a potentiometer.
ea
10K
50K
10K
(SETS INPUT Z)
ZIN
=
10K
GAIN SHOWN IS +11
ZIN
=
10K
FIG. 6-THIS CONFIGURATION allows the
gain to be adjusted by the ratio of feedback to input resistance.
GAIN OF TEN
VOLTAGE FOLLOWER
circuit. The gain is determined by the
ratio of feedback and input resistance.
ply, ranging from ±5 to ±20 volts, with
±15 being the best, or its battery equivalent.
Suppose we use 100% voltage feedback
from the output to the negative input. The
output voltage always must equal the input voltage and the gain of the amplifier
will always force the difference between
output and the -i- input to zero. The output will follow the + input with unity
gain, giving us a voltage follower. The
input impedance is very high since we are
going into the + input and the frequency
response (although not necessarily the
slew rate) is very good since we don't
need much loop gain. The output impedance is very low and you can think of the
circuit as a super emitter follower.
The circuit is shown in Fig. 5. Its advantages over a single transistor include a
gain of exactly one, no temperature dependent 0.6 -volt offset between input and
output, a higher input impedance, and a
lower output impedance. Note that you
must provide base current bias through
your source for the + input.
Figure 6 gives us a voltage follower
with gain. Here jnstead of 100% feedback, we feed back only a fraction,
voltage-divider style, and we end up with
FIG.
7- INVERTING
FIG.
9- INVERTING
SUMMING AMPLIFIER
circuit. The gain of each input is
In
dently determined by the resistance
iepenratio.
a non -inverting voltage amplifier with
gain. The gain is anything you wane from
one upward to anything less than ten
times the open -loop gain. Reasonable
limits for a gain of ten are 10 kHz and
100 kHz for unity gain. With the L14318,
you can run respectively at 200 kHz and 2
megahertz for the same gains.
Note that the gain is NOT the ratio of
the two resistors but is one plus the ratio.
Thus, the minimum gain is unity. Note
also that you must provide base bia. current for the + input through the sou ce of
your signal.
The standard inverting gain-of-on: am-
43
www.americanradiohistory.com
10K
5K
10K
5K
eOUT
eIN
eOUT
eIN
10K
10K
016
I(
I\
016
016
016
LOWPASS,
10K
I
- input and since the
-pedance
input a virtual ground, the input imequals the input resistor, or 10K
going into the
41:10K
is
if a 10K resistor is being used. We can
vary the gain as shown in Fig. 8. In
Fig. 9, we have a mixer or summer circuit. As many inputs as needed can be
used, and the gain of each will be independently set by the ratio of its input
HIGHPASS, +12DB/OCTAVE, 1kHz
12DB/OCTAVE, 1kHz
2000pF
"IN
1000pF
10K
10K
BANDPASS Q= 4, 1kHz, SINGLE POLE
5 MEG
Q ADJ
eIN
10K
10K
10K
10K
eOUT
HIGH PERFORMANCE, VARIABLE Q, 1kHz, Q'S TO 500
FIG. 10-ACTIVE FILTER circuits. Highpass, Iowpass, and two bandpass filter circuits
are shown. The values of the capacitors are changed to change the frequencies.
LINEAR
100K
V
RAMP
luF
U--
OUTPUT
'OUT
o
OPEN
CLOSE
SWITCH
OPEN
(a)
6
T 1558
33K
-Jvv
1N914
GATED
CURRENT
220K
CAL
SOURCE
.05
4.7K
(
15K
.---A/VVeIN
4.3K
2200p
555
IN
OUT
MONO
o
OUTPUT
2.2K
0 TO
4
VOLTS SETS
FREQUENCY
500K
ZERO
INTEGRATOR
-.II~
470pF
22052
-
--a- COMPARATOR
resistor and the feedback resistor. Since
input,
there is a virtual ground on the
there is no interaction between inputs and
you get a linear summation of the inputs.
Input impedance and gain is set for each
input by its resistor. Note that the circuit
inverts, so the low- frequency output will
be 180° out -of -phase with the input.
Figure 10 shows us some active filter
circuits, including second-order low-pass
and high -pass filters, and two different
types of bandpass poles. The frequencies
shown are 1 kHz. Change capacitors to
change frequency. The damping control
sets the peakedness or droop of the response at the cutoff frequency. The threeamplifier band -pass filter needs only a gain
of 3Q or so per amplifier at the center
frequency and independently adjusts Q,
gain, and frequency. Q's of several hundred to a thousand are possible.
A ramp generator is built using the circuit of Fig. 16. It is also called an integrator and the slope rate of charge
buildup is given by the formula:
Ov
I,, = C -At
i = current in milliamperes
C = capacitance in AF
Dv = voltage change in volts
At = time interval in milliseconds
Note that you MUST enter via the
input for an integrator of this type and
you must provide base current bias
through the source.
A voltage -controlled -oscillator or VCO
can be built using the combined integrator- comparator circuit of Fig. 11. The
negative input continuously charges the
capacitor in the positive direction. When
it reaches zero, the snap-action comparator (note positive feedback) trips a mono stable and current source (both these
have to be precision) and charges the
capacitor rapidly negative. The capacitor
jumps back negative and the time to
charge is set by the input current. Output
frequency is precisely related to the input
voltage. It is called a charge subtractor
VCO and can be made very stable. Maximum frequency using 741's is around 10
kHz, with best performance below 5 kHz.
We'll end our applications survey with
a quick look at some non-linear techniques. If we use an op -amp and two
ordinary silicon diodes, we can build the
half -wave rectifier with a choice of polarity shown in Fig. 17. The normal 0.6volt drop across the silicon diode is taken
out completely by the op -amp, and you
(continued on page 82)
-
10K
eOUT
100K
plifier is shown in Fig. 7. Here the gain
is set by the ratio of the output resistor to
the input resistor. With a 10K resistor on
the input and a 100K resistor on the output, the gain will be 10, and so on. DC
bias need not be provided by the source,
and you can capacitor- couple the input for
AC only applications. With identical resistors, the gain will be -1. Since we are
25µSEC
CHARGE PUMP
lb)
11- ACTIVE INTEGRATOR is shown in a. The slope of the linear ramp output is
determined by theR -C time constant. The switch reaurns the output to zero. A voltage controlled oscillator using an integrator is shown in b.
FIG.
www.americanradiohistory.com
-
I1I. .k
PA Wo rk
-
Setnng up and operating a sJ
system is not
rc
toement
í re aware of the intricac,e:
invo,`ved ,n the p
a graduation
THE SOLUTION TO MOST SOUND REINFORCE-
a local political speech or
ment problems is usually found in the
proper match between performers, equipment, and the environment. With the
proper choice of equipment and careful
planning, a sound equipment installer can
overcome problems that often prevent
a sound reinforcement system from performing as it should.
Sound reinforcement systems come in
a large variety of types. A simple system
used for lectures might consist of a single
microphone, amplifier, and loudspeaker,
while an outdoor rock concert could require an array of equipment that can
only be transported by a caravan of
trucks. To illustrate two basic types of
systems often encountered, let's look at
two examples.
Figure 1 shows a system intended to
provide sound reinforcement for a lecture or speech. Typically, a single microphone is placed on a podium or a floor
stand, perhaps two feet in front of the
lecturer. The microphone is connected
to a small microphone mixer, a power
amplifier and a pair of loudspeakers located on each side of the stage. In some
installations, a single speaker or cluster
is located directly above the stage. This
simple system, called a public address
system, would certainly be adequate for
'Senior Development Engineer
day ceremony. But when a rock group
arrives for an appearance, a much larger
system is a must.
A typical sound system designed for
live entertainment is shown in Fig. 2. In
this system, many microphones are used
to cover all vocalists and several musical
instruments. Multiple power amplifiers
and large, efficient speaker systems are
needed for the vocalists in order to compete with the high sound levels produced
by the electrified musical instruments.
The microphone mixer, or audio console,
is preferably located in the audience seating area where the sound technician can
both see and hear the performance. Most
groups demand an on -stage monitor or
"foldback" system consisting of speakers
aimed back toward the group, rather than
toward the audience. These speakers
reproduce the vocalists and percussion instruments so the group can hear themselves sing over the sound of their electrified instruments. Finally, accessory devices such as echo units, equalizers, limiters, electronic crossovers and digital time
delay lines may be included to produce
various sound effects.
Even though the systems of Figs. 1
and 2 are drastically different, they share
problems that are common to most sound
reinforcement systems. Specifically, problems related to sound quality, intelligi-
Shure Brothers, Inc., Evanston,
IL.
bility, feedback, coverage, reliabii y and
equipment compatibility will be fr.uently encountered in most sound reinforcement situations.
Sound quality
In sound reinforcement systenr.., poor
sound quality usually refers to poor fidelity, lending an unnatural character to the
sound. Poor fidelity is normally caused
by frequency response problems or by
the presence of distortion. Consequently,
the solution to the problem o: poor
sound quality requires a system with
good frequency response am
low
distortion.
A reasonable design goal for fre ;uency
response of a sound reinforcement system
is uniform response from 150 -H2 to 7kHz for speech -only systems am from
50 -Hz to 12 -kHz for speech and music
systems. Some factors that affe,:t frequency response are: 1) Cabl:.. To
achieve good high-frequency rei.ponse,
high-impedance microphone cable must
be kept under 20 feet in length. If longer
cable runs are required, low-imp xlance
microphones should be used. 2) Loud
speaker response. The loudspeakers
chosen for the job must have a wide range frequency response both :In -axis
and off -axis. 3) Microphone re ponse.
A microphone should be chosen +'ith a
frequency response that complements the
;
;
45
www.americanradiohistory.com
the microphone lines. Then check
every other electronic device in the sound
system and make sure that it is operating
within its intended range of signal levels.
A VU meter or overload indicator is
very helpful here.
Another common source of distortion
is power amplifier clipping. This is often
caused by overdriving the power amplifier input. If the power amplifier does
not have enough output power for the
job, it may be operating at nearly full
power on an average basis with no reserve power for peaks. Peak clipping
and distortion will result. A speaker load
impedance that is too low for the power
amplifier will make this situation even
worse.
Loudspeakers can also contribute to
distortion in the sound system. Inherently, every loudspeaker produces some distortion due to nonlinearities in the conversion of electrical energy to sound
energy. At higher sound levels, this distortion may become objectionable. This
is particularly true of speakers that are
not specifically designed for sound reinforcement applications. Sound-reinforcement speakers can generally operate at
high sound pressure levels without objectionable distortion. Nevertheless, even
sound reinforcement loudspeakers must
be used within their ratings. Check them
periodically to make certain that there
has been no deterioration.
in
POWE
R
AMPL
MICROPHONE
MIXER
PERFORMER
MICROPHONE
SPEAKS
FIG.
1- SIMPLE
SPEAKER
STAGE
sound reinforcement system.
OUT
POWER
DRUMS OR
INSTRUMENTS
AMPL
IN
POWER
OUT
AMPL
SINGERS
CjI
MICROPHONES
SPEAKER
MONITOR
SPEAKER
MONITOR
SPEAKER
SPEAKER
STAGE
OUT
ECHO UNIT
POWER
EQUALIZER
AMPL
MONITOR OUTPUT
11111111
FIG.
2
-A
Illli©
HOUSE OR PROGRAM OUTPUT
MIXING CONSOLES
COMPLEX
sound reinforcement system that
is primarly used for live enter-
tainment.
THE AUDIO CONSOLE should be placed in
the audience for easily blending the sound.
original sound source. Manufacturer's
catalogs can supply many hints concerning the proper choice of microphones.
Even when all of these three factors
are considered, the frequency response
of the system may still be inadequate,
due to the characteristics of the room itself. In a difficult acoustical environment,
electronic equalizers and filters can be
used to compensate for deficiencies in the
system or room response.
Distortion is the second key factor that
contributes to poor sound quality. Distortion can originate in several places in a
sound system. For example, Some condenser microphones contain electronic
circuitry which can be overdriven when
subjected to high sound pressure levels.
When high sound levels are expected, the
choice of a good quality dynamic microphone will prevent this source of distortion.
Microphone input circuits in mixers or
audio consoles may also generate distortion if they are overdriven as a result of
high sound pressure levels. A circuit that
performs perfectly for the system shown
in Fig.
with its relatively low sound
pressure input to the microphone, might
overload badly when used with the loud
singing often associated with the system
shown in Fig. 2. To prevent this type of
distortion (which is very common), the
microphone signal level must be reduced
to an acceptable level. Some audio consoles have input attenuators for this purpose. If you are installing a console that
does not have this feature, insert external attenuator pads of 15 dB or more
1
46
www.americanradiohistory.com
Intelligibility
Intelligibility is the most important
problem in vocal sound reinforcement.
Good intelligibility is necessary to
achieve communication between the person speaking and his audience. The
causes of poor intelligibility are primarily related to frequency response,
distortion, ambient noise and room reverberation.
For maximum intelligibility, the frequency response of the system should
emphasize those portions of the human
voice that convey the most speech information. This frequency response is not
necessarily optimum for high fidelity
music reinforcement. Many studies have
shown that a peak of 3- to 6 -dB in the
frequency range of 4- to 7 -kHz can be
helpful in emphasizing critical sibilant
and consonant sounds. Excessive low frequency response can be detrimental to
intelligibility and it is usually advantageous to provide a low- frequency roll off below 150 Hz. Microphones are available with these frequency response characteristics and additional equalization is
not normally required.
Ambient noise in a room reduces intelligibility by masking the speech information. Ventilation fans, motors, audience noise (especially in dinner clubs)
and sound leakage from outdoor sources
(traffic, machinery, etc.) are prime contributors to the ambient noise level in
a room. For good intelligibility in a noisy
environment, the sound system should be
capable of producing a level approximately 20 to 25-dB higher than the ambient noise level. The amplifier power
and speaker efficiency must be adequate
to achieve this level.
An excessively reverberant room will
reduce the intelligibility of any sound
reinforcement system. In such a room,
the audience may hear a great deal more
reverberation than direct sound, and intelligibility will be impaired. In this
case, the excessive reverberation is really
a "noise" competing with the desired
sound. Reverberation problems can be
minimized by using directional speakers
located close to the audience and aiming
them away from large reflective walls or
ceilings. The best solution to the reverberation problem, although usually impractical and expensive, would be to
acoustically treat the room with sound absorbing materials.
Feedback
Acoustical feedback is such a common
problem in sound reinforcement that we
almost expect it to make its presence
known as if it were part of the live performance. Regardless of the size or complexity of the system, feedback is one
problem that any sound technician would
like to eliminate. Three kinds of equipment are normally used to reduce or
eliminate feedback: directional microphones, directional speakers and electronic equalizers.
A good unidirectional microphone can
greatly reduce the likelihood of feedback. A unidirectional microphone has
maximum sound pickup in only one
direction, so aim it in the direction of
the originating sound. In this position, it
will tend to pick up the desired sound
while rejecting both the direct and reverberant sound field that the loudspeaker system produces at the sides and rear
of the microphone. A sound system test
for feedback should always be made under actual performance conditions. Items
such as tables and podiums can direct
sound reflections into the microphone,
and these items should be considered part
of the total sound system environment.
The directional characteristics of the
loudspeaker system can also be used to
minimize feedback problems. Speakers
should be placed as far forward on the
stage as possible and aimed toward the
audience and away from the microphones. In reverberant environments. the
reflected sound of the speakers can
eventually reach the microphone and
cause feedback. In this situation, the
speakers should be placed high and aimed downward at the audience to minimize reflections from the rear wall and
ceiling.
Once the microphones and loudspeakers have been positioned for minimum
feedback, electronic equalization can add
further improvement by reducing the
gain of the system at frequencies where
feedback occurs. Figure 3 shows an electronic filter designed to reduce feedback
any of eight one- octave filter bands.
Narrow -band filters containing as many
as 27 one -third octave filter bands are
also available to provide finer control.
An ordinary digital frequency meter is
very useful for identifying feedback frequencies. The technique used for feedback equalization is to slowly increase
the system gain until a feedback frequency is sustained. The appropriate filter is then adjusted while the system gain
NSW
FIG. 3 -SHURE M610 equalizer Is designed
for controlling feedback.
control is increased until the feedback
mode shifts to a different frequency. The
procedure is then repeated with other
filters.
If feedback suddenly occurs during a
performance, it would be unwise to attempt an adjustment of a narrow -band
equalizer. To cope with this situation,
some consoles provide anti -feedback filters which can be instantly switched into
the console circuit to eliminate the feedback condition. The console in Fig. 4
o p
a a a a a d
A
Q
rlsásrr
FIG.
4
-SHURE
.
et
ii i i
6,
M
co.
If the required SPL at 32 feet is 94 dB,
then the amplifier power would have to
be increased from 1 watt to ID watts
(10 dB).
In general, horn -loaded loudspeakers
have high efficiency but a very large
enclosure is required to achieve good
low-frequency response with this type
of speaker system. In applications where
size and portability are important, some
column loudspeakers feature excellent
efficiency in a relatively small I ackage.
It is possible to combine the fea ures of
both types of loudspeakers as shown in
Fig. 5. The loudspeaker illustrated in
ó 0 0
o
111 1?1
SR101 audio console.
provides one additional aid to control
feedback. It has a phase reversal switch
controlling the console output. As surprising as it may seem, low- frequency
feedback problems can often be eliminated by using this switch.
Coverage
Coverage refers to the ability of a
sound reinforcement system to deliver
an adequate sound level to the entire listening area. Inadequate coverage is usually due to low speaker sensitivity, too few
speakers, improperly aimed speakers, insufficient amplifier power or inadequate
FIG. 5 -SHURE SR108 column speaker
system.
this figure combines high -efficient :y with
a wide frequency response.
The correct number of loudspe tkers is
determined by the size and shape of the
room. In a rectangular room seating
about 1000 persons, a pair of speakers
similar to the one shown in Fig. 5 will
usually be adequate. The speakers should
180°
gain.
Loudspeaker sensitivity is expressed in
terms of the sound pressure level (SPL)
produced on -axis at a reference distance
for a given power input in watts. The
Electronic Industries Association (EIA)
method of measurement uses a distance
of 30 feet with a power input of 1 milli watt. Another commonly used set of conditions is a -meter measurement for a
power input of -watt. Speaker manufacturers generally use one of these two
rating methods. From either rating
method, the SPL can be determined for
any other distance or power input (within the speaker's maximum power rating).
Textbooks covering loudspeaker design
contain equations that can be used for
these calculations. As a rule of thumb,
the SPL decreases by 6 -dB each time the
distance from the speaker is doubled, and
it increases by 10 -dB each time the power
is increased by a factor of 10. For example, a speaker which produces 102 -dB
SPL at 4 -feet with a power input of 1watt will produce, 96 -dB at 8 -feet, 90 -dB
at 16 -feet, 84 -dB at 32 -feet and so forth.
9
/60°
1
1
0
---
LEGEND
100
Hz
KHz
8 KHz
1
6-
HORIZONTAL POLAR RES DONSE
graph for speaker system shown in Fig. 5.
FIG.
be placed on each side of the sound
source and positioned so that thl:y aim
toward the back of the listening ti rea. If
the room is particularly wide, it nay be
necessary to cluster two or three speakers
on each side of the stage. In this case,
each speaker should be positioned so that
(continued on page 63)
L
C
v
CD
47
www.americanradiohistory.com
BUILD THIS
Digital Scope Memory
Add this accessory to any scope to convert it to
4- channel digital storage scope
a
by CHRIS TITUS
LAST MONTH WE PRESENTED THE CIRCUIT
description, operation and construction
details of the DSSC.
This month, the article will conclude
with a few applications on the foil
patterns.
Ramp selection
To determine whether we need a positive or negative sawtooth for the X -axis
deflection, we must first examine the
operation of an SN7476 J -K flip -flop.
We know that if both J and K are at a
logic 1 (+5V), we can clock the clock
input of the flip -flop and the output frequency of either Q or Q will be exactly
1/2 of the clock frequency. If we were to
observe the clock input and the Q output of the flip-flop on a dual -trace scope,
we would expect to see the waveform
in Fig. 5. Notice that the Q output
changes on the negative edge (NET) of
the clock signal. Also remember that the
scope's beam is being swept from left
to right.
If instead of sweeping the beam from
left to right, we could imagine the beam
being swept from right to left, we would
expect to see the waveform in Fig. 6.
The visual differences are fairly obvious.
In Fig. 6, the J -K flip -flop looks as if
it were a positive edge triggered (PET)
device.
Using these two examples, the selection of the appropriate ramp is fairly
simple. We must calibrate our instrument
so that when we test a SN7476 with the
DSSC, the scope display looks like Fig.
5. Of course, different devices could be
used for the calibration, but the SN7476
is very common and easy to use. It is important not to confuse the SN7476 with
the many other types of flip -flops. If
different scopes are to be used quite
often with the DSSC, it would be very
easy to bring out both ramps to a SPDT
switch mounted on the rear of the DSSC.
This would certainly speed the calibration procedure.
Using the DSCC
To use the DSSC to diagnose digital
logic, we must first properly adjust some
of the external controls. No matter which
channel we use to trigger the DSSC or
what our data acquisition speed is, we
must always arm the DSSC before each
use by depressing the ARM pushbutton.
After the DSSC is armed and triggered,
the data will continue to be displayed
until the DSSC is again armed or power
is lost. We must also set the CHANNEL
SELECT switch to determine which of the
possible 6 signals; the 4 data inputs,
manual pushbutton or external trigger
source, will be used for triggering. We
must also determine whether we will
trigger the DSSC on a positive or negative edge (PET or NET).
The frequency selected will greatly influence the quality and usefulness of the
displayed data. If we want to observe a
2 -KHz (500 -µs) pulse train, we would
not set the frequency at 2MHz (1 pnt/
500 ns). At this frequency, we would
completely fill the memory before one
complete cycle of the 2 -KHz signal had
occurred. Too low a frequency will often
result in a display of seemingly random
data. A reasonable rule -of-thumb would
be to select a frequency 4 or 5 times
faster than the data frequency. It may be
desirable in some cases to use the crystal
clock in the DSSC to synchronize the
logic under examination to the DSSC.
These frequencies can be derived from
the 2 -deck rotary switch and be brought
out to a binding post.
The PRE-TRIGGER /NORMAL and DELAY/
NORMAL switches can be set to all 4 possible combinations. Normally however,
either both the switches will be in the
NORMAL position or one will be in the
NORMAL position and the other in either
the PRE-TRIGGER or DELAY position. The
setting of the thumbwheel switches is
self -explanatory. Note that in the DELAY
mode, the trigger source, as selected by
the CHANNEL SELECT switch, is also used
to pulse the down counters. Finally, a
good ground must be established between
the DSSC, via a GND binding post and
the logic being tested.
Figures 7 and 8 are just two examples
of some TTL circuits that can be tested
with the DSSC, the appropriate DSSC
switch settings, and the observed oscilloscope display.
R -E
+5V
CHANNEL 4
CHANNEL 3
CHANNEL
20 kHz (USER
SUPPLIED)
B
CHANNEL 4
CHANNEL 3
OUTPUT
PIN 9
CHANNEL
A OUTPUT
PIN 12
Roll)
Ro(2)
DSSC
+5V
CHANNEL
DSSC
2
CONTROL SETTINGS
FREQUENCY - 200 KHz
CHANNEL SELECT -CHANNEL 2
PET /NET - NET
PRE-TRIGGER /NORMAL - PRE -TRIGGER
DELAY /NORMAL - NORMAL
THUMBWHEEL SWITCHES - NOT APPLICABLE
CLOCK
BY GROUNDING THE SWITCH TO THE Roll
INPUTS WE TRIGGER THE DSSC.
AND Roll)
2
a
CONTROL SETTINGS
FREQUENCY - 200 KHz
CHANNEL SELECT - CHANNEL 3
PET /NET - NET
PRE- TRIGGER /NORMAL - NORMAL
DELAY/NORMAL - NORMAL
THUMBWHEEL SWITCHES - NOT APPLICABLE
KEEP THE PREVIOUS COUNTER CIRCUIT, KEEPING
THE SWITCH CLOSED TO GROUND, ADD THE SN7400
AND MOVE THE DATA INPUT WIRES FOR CHANNELS
2, 3 & 4.
CHANNEL
I
OUTPUT
FIG.
5- OUTPUT
WAVEFORM from a J -K
be observed on an
flip -flop that would
oscilloscope.
CHANNEL2
CHANNEL
CHANNEL
2
CHANNEL3
0
0
O
1
1
1
CLOCK
OUTPUT
FIG.
J
u u
6- OUTPUT
L
WAVEFORM from a J -K
flip -flop if the scope beam traced from right
to left.
CHANNEL 3
CHANNEL
4
-4 -BIT
BINARY COUNTER can be
tested using the DSSC. The connections are
shown in a, and the resulting waveforms are
shown in b.
FIG.
7
48
www.americanradiohistory.com
CHANNEL 4
0
IF WE JUST LOOK AT CHANNELS 2, 3 & 4, WE WILL
HAVE THE TRUTH TABLE FOR A 2 INPUT NAND GATE)
b
-THE
DSSC can be used to dynamically test NAND gates. Te connections are
sown in a, and the resulting waveforms are
shown in b.
FIG.
8
40 KHZ
o
Lo
COMPONENT LAYOUT of the memory circuit board sho
the component side up.
COMPONENT LAYOUT of the time base circuit board
the component side up.
+m
from
C18-.001-AF polystyrene
C17- .002-µF ceramic disc
C19, C20- 500 -4F 25V electrolytic
C21- 10,000 -aF 10V electrolytic
pc,
Q1- 2N2222
Q2-2N5060
general purpose NPN
SCR
D1-D8-1N4001 or equal
D9, D10 -12V, 1W Zener, 1N4742 or equal
IC1, IC2 -74192 synchronous decace up/
down counter -TTL
IC3, IC5 -7400 quad nand gate -TTL
IC4 -74123 monostable multivibrator- -TTL
IC6, IC7, IC8, IC9 -7490 decade counter
-
TTL
IC11 -74121
IC10,
IC13,
monostable multivibrato
-TTL
IC12 -747 dual operational amplifier
IC14- N2527V dual 256 bit stat :; shift
register (Signetics) -MOS
IC15 -74153 dual four -to -one multiplExerTTL
IC16, IC17 -7476 dual J -Kflip- flop
IC18 -7430 8 -Input positive nand gatE--TTL
IC19, IC20 -7493 4 -bit binary counter - TTL
Q3- LM309K or equal
-T'L
.u
DSSc
TIME
T1 -24VCT 1/2A
BASE
power transformer
T2 -6.3V 1A power transformer
LED -MV 5020 or equal
L°
XTAL -4.0000
FOIL PATTERN for the time base circuit board is shown 1/2-size.
o
O
I
i
'Fyn
-
41'11"
1C-i
4
b
LL°0:1.
T
o
O
a
4
i
°
p
O
1%7
ocr
The Johnson 189 -505 -5 is available from:
'1__f
MEMORY
-2
Misc.
Mounting hardware, fuseholder, line cord,
fuse, power (110 VAC) switch, 6-: way
binding posts. 2 BNC connectors for he X
and Y signals, pilot light, rubber fee Bud
chassis AC 412 and bottom plate BPA 1520.
pT
DSSC
MHz crystal available from
International Crystal, 10 North Lee, Oklahoma City, OK 73102
Order as: 4,000 KHz EX series crysta $3.95
pole, 11 position, 2 deck .otary
S1
switch, NON -SHORTING (1 pole /deck)
52 -1 pole, 6 position rotary switch,
NON -SHORTING
S3, S4, 55, 59 -SPDT miniature 'oggle
switch
S6, S7 -SPST normally open, momentary
pushbuttons
58- Digitran 23102 -2; 2 module thumb wheel switch, BCD complement with one
common
Circuit Specialists Co., Box 3047
Scottsdale, AZ 85257
- -
00
or
FOIL PATTERN for the memory circuit board is shown
-R8, R13, R16, R17, R30, R32-1000 ohms
R9, R11, R18, R34-220 ohms
R10 -560 ohms
R12 -1800 ohms
R14, R15, R28-470 ohms
R19
ohms, 1W
R20 -220 ohms, 1/2W
R1
-47
R21 -R26, R27,
R29- 10,000
ohms
1/2
Burstein-Applebee, 3199 Mercier
-size.
Kansas City, MO 64111
R31, R35, R36 -4700 ohms
R33 -5600 ohms
-RF ceramic disc
C1 -C4, C10- C16
C5- 100 -uF 6V electrolytic
-pF ceramic disc
C6, C7
-pF ceramic disc
C8
1,7
-pF trimmer; Johnson 189 -505 -5
-.1
-62
-33
C9- -14
or equal
Both the memory and time base :class,
Epoxy printed circuit boards, drille cut
to size and ready for component iris, -rtion
are available for $12.95 postpaid from
Techniques Inc., 235 Jackson E.reet,
Englewood, NJ 07631. New Jers tr residents should add 5% sales tax.
cr
CD
V
49
www.americanradiohistory.com
rffo /1,11,11,,f1g,
Easy -to -build COSMOS
burglar alarms
Three more burglar alarms are described.
In addition, different sensor systems and methods
of installing a burglar alarm system are explored.
by R. M. MARSTON
IN PARTS
1 AND 2 OF THIS 3 -PART ARTICLE,
we showed how you can use modern
COS /MOS digital integrated circuits to
produce your own tailor -made burglar
alarm systems. In this concluding part of
the series, we show how you can use
COS /MOS to make a variety of 10 -watt
alarm -call generators to use in place of
alarm bells or sirens in these alarm systems. We also give advice on how to
select alarm sensor systems to solve your
generator, which produces an 800 Hz
tone that is pulsed on and off at a rate
of 6 Hz. Here, gates A and B are wired
as a 6 Hz square -wave generator, which is
used to alternately enable and disable
the 800 Hz oscillator formed by gates C
and D. The output of the 800 Hz oscillator
is fed to the speaker via transistors Q1
and Q2. More than 10 -watts of power are
fed to the speaker from the 12 volt supply.
Finally, Project 13 shows the connections for making a warble -tone alarm -call
generator. The output of this generator
switches alternately between 600 Hz and
450 Hz at a rate of about 6 Hz. Here,
the 6 -Hz oscillator formed by gates A
own particular home- protection problems.
D1
512
IN4001
SPK R
Alarm -call generators
The COS /MOS digital IC known as
the CD4001AE quad 2 -input NOR gate
can readily be made to function as a
modulated or unmodulated low -frequency
waveform generator. The output of such
a generator can easily be fed to a speaker
via a simple 10 -watt 2- transistor power
amplifier stage. Such a system functions
as a very efficient alarm -call generator,
for use in place of conventional alarm
bells or sirens. These alarm generators
can be activated via the normally -open
contacts of the main alarm system.
The circuit of a simple 10 -watt monotone alarm -call generator is shown in
Project 11. Here, two gates of the CD4001AE integrated circuit act as an 800 Hz square -wave generator. The output
of this generator is fed to a 5 -ohm speaker via a direct -coupled power amplifier
stage formed by Q1 and Q2. The action
of the circuit is such that the transistors
are alternately switched from the fully
off to the saturated states at a rate of
800 Hz, so the power losses of the circuit
are quite low. More than 10 watts of
power are fed to the speaker from the
12 -volt supply.
The Project 11 circuit makes use of
only two of the four available gates of
the CD4001AE COS /MOS IC. The remaining two gates are disabled by shorting pins 8, 9, 12 and 13 to pin 7.
Project 12 shows how all four of the
gates of the CD4001AE can be interconnected to make a pulsed -tone alarm -call
I
I
MAIN ALARM
- - - --
SYSTEM RY1 -1
L
Q2
2N3054
B1
1
PROJECT 11- MONOTONE 10 -watt alarm -call generator. Two gates of the CD4001 IC form
an 800 -Hz square -wave generator.
Cl
-
C2
0.1 NF
¡ .001
IN4001
8\
CD4001AE
/
2
1/4
5E2
10
SPKR
CD4001AE
9/
GATE A
GATE
C
MEG
I
820K
5
GATE
B
1/4
12
CD4001AE
6
/
D
1
I
SYSTEM
I
R4
10012
GATE
MAIN
ALARM
I
R2
R1
1
D1
14
L-
--
RY1 -1
I
I
WATT
1/4
CD4001AE
13
11
Q2
2N3054
131
_
12V
PROJECT 12- PULSED -OUTPUT 10-WATT alarm -call generator. This circuit uses all four
gates of the CD4001 IC.
50
www.americanradiohistory.com
I¡`-
L F
OSCILLATOR
(600Hz & 450Hz)
M F
OSCILLATOR
(6Hz)
Cil
0.1 NF
(
14
/4
1N4001
C
10
1/4
55
SPKR
CD4001 A E
9
CD4001AE
2
E D1
GATE
8\
.
1
C2
.001
J
GATE A
I
R1
MEG
1
r (--
R3
820K
10K
I
GATE
B
1/4
1/4
13
)CD4001AE
7
1
D
12
MAIN
ALARM
SYSTEM
ol
RY1 -1
R6
10052
GATE
5
6
R2
WATT
11
CD4001AE
R4
22K
02
Q2
2N3054
4
(SI LICON)
NOTE: D2
=
GENERAL -PURPOSE SILICON DIODE
PROJECT 13- WARBLE -TONE 10 -WATT alarm -call generator. The output switches between
600 -Hz and 450-Hz.
and B is used to vary the period and thus
the frequency of the oscillator formed by
gates C and D. The output of the CD4001AE is fed to the speaker via Q1 and
Q2. The output power of the circuit is
greater than 10- watts.
Note that the three alarm -call generator circuits of Projects 11 through 13
each use a 12 -volt battery supply. Also
note that each circuit uses a 5 -ohm
speaker, and that a damping diode is
wired across this speaker to suppress unwanted back EMF's.
Your choice of the three alarm -call
generator systems will be entirely a matter of personal taste. As can be seen
from the circuit diagrams, each type of
generator can easily be converted to
either of the other two types by simply
changing a few IC connections and adding or deleting a few components, so I
suggest that the reader tries out all three
circuits and then decides which sound he
likes best.
Once a generator system has been
selected, it can be activated from the
main alarm system by wiring the alarm's
normally open RY1 -1 contacts in series
with the generators positive supply lines,
as shown in the diagrams. Note that the
generator must use supply batteries that
are independent of those of the main
alarm system.
of the goods that are to be protected, and
the ideas on crime prevention of the
individual property owner. The choice
of an installation is a very personal
matter. The following notes are given to
help you make that choice.
Any building can, for crime prevention
purposes, be regarded simply as a box
that forms an enclosing perimeter around
a number of interconnected compartments. This perimeter 'box' is the shell
of the building, and contains walls, floors,
ceilings, doors and windows. To commit
any crime within the building, an intruder must first break through this
perimeter, which thus forms the owners
first line of defense.
Once an intruder has entered the
building, he can move from one room or
'compartment' to the next only along
paths that are pre- determined by the layout of internal doors and passages. In
moving from one room to the next, he
must inevitably pass over certain `spots'
in the building, as is made clear in Fig.
3, which shows the ground-floor plan of
a small house. Thus, to move between
the lounge and the hall he must pass
over spot X 1. To move between the
kitchen and the hall he would tend to
I
PARTITION WALL
W = WINDOW
D = DOOR
Alarm sensor systems
All the alarm circuits that we've described in this story are `contact- operated'
types. They are activated by the making
or breaking of electrical contacts that are
built into simple sensor devices. These
sensors can take the form of microswitches or reed relays that are activiated
by the opening of a door or window, of
pressure pads that close when a person
steps on a rug or carpet, or of lengths of
wire or foil that break when a person
forces an entry through a window, wall,
floor, or ceiling.
The selection of a complete alarm
sensor installation depends on a number
of factors. Included amongst these are
the physical properties of the particular
building that is to be protected, the value
pass over spot X2, and to move fi om the
ground floor to the upper floor l e must
pass over spot X3. These spot points form
the owners second line of defense.
Thus, the owner can obtain protection
by using full or partial `perime er' defense, or by using `spot' defense or by
using a combination of the two ir ethods.
The most expensive type of alarm
sensor installation that can be fitte i is the
full perimeter defense system t gat includes series-connected sensor wires built
into all walls, floors and ceilings, as well
as microswitches or reed relays on all
doors and windows. This type of installation is normally fitted only to amunercial buildings such as jewelry sto -es and
storage warehouses where the risks of
burglary by skillful intruders is vely high.
The least expensive type of alarm
sensor installation is the spot defense
system, which can consist of just two or
three pressure pads wired in para lel and
hidden under rugs or carpets. TI is type
of installation is adequate where the risks
of burglary are small and the v due of
the protected goods is fairly low.
Intermediately priced `partial' perimeter
defense installations can range from something as simple as a microswitc :1 on a
single side or rear door, to sor^lething
that includes microswitches or reedrelays on all doors and window Frames,
plus protective foil on all windo ws and
sky lights. These systems can gi- a adequate protection against both the amateur
and professional burglar, part cularly
when the installation is coupled tc a spot
defense system.
Burglars can, in general terms. be described as fitting into three distinct types.
The most common of these is the novice
or amateur burglar who will t nter a
house at random in the hope that it contains items worth stealing. This ype of
intruder usually has insufficient :.kill or
motivation to beat even the simp est detector devices, and will run off at he first
sound of an alarm bell.
The second type of intruder is the
small -time professional. This t pe of
burglar breaks into a house only if he is
sure that it contains valuable items. Before attempting to enter a ho rse he
makes a thorough reconnaissance of its
defense systems, and commits the actual
X = PRESSURE -l'AD
STAIRS
w
W
LOUNGE
r
I-
z
-i
DINING ROOD
X3/
o
cc
LL
KITCHEN
I
W
X2
L__
FIG.
3- GROUND -FLOOR PLAN of
a
small house showing suitable positions (marked
't" for
pressure-pad "spot" defenses.
51
www.americanradiohistory.com
burglary only if he thinks he has found
an unprotected entry point, such as a
skylight or an accessible ceiling or floor.
He may be so nonchalant that he will
ignore an alarm bell for several minutes
before fleeing. The best defense against
this type of intruder is a carefully thought
out partial perimeter system combined
with a few 'spot' defense points.
Finally, the most difficult burglar to
beat is the organized professional, who
plays for high stakes and will go to great
lengths to win. He may be willing to
simply crash his way through a defense
wall and hurt anyone that gets in his
way. He may be undetered by the sound
of an alarm bell. The most effective defense against this type of criminal is a
multiple perimeter system where the main
building is surrounded by a partially protected outer perimeter, such as a wall,
and all valuables are held within a fully protected inner perimeter, such as a
strong room.
It should be noted that all alarm systems should, ideally, be fitted with a
'panic' facility. to enable the owner to
summon aid if an intrusion occurs while
he is on the premises.
Different crime -prevention authorities
have different ideas on the best way to
protect a home against burglary. Some
claim that every effort should be made
to keep burglars out of the house at the
outset and that all possible points of entry should be protected. Others claim
that a determined and skillful burglar
can get past all but the most comprehensive perimeter defense systems, so the
most sensible approach is to have a very
simple partial perimeter defense system
combined with an efficient spot defense
network, so that the intruder can enter
the premises with relative ease but is
scared off as soon as he gets inside.
Thus, there are many points to consider when selecting a sensor system and
the reader must make up his own mind
as to the best system to use in his particular case. Once the sensor system has
been selected, the layout of the complete
alarm system installation must be considered. The following notes should be
of value in this respect.
FRONT
DOOR
DEFENSES
STAIR
DEFENSES
GARAGE
DEFENSES
MAIN
ALARM
SYSTEM
AUXILIARY
ON
ON
ON
ON
ON
OFF
OFF
OFF
INPUTS
IÚ
OFF
FIG.
5-TYPICAL
OFF
CONTROL CENTER
instrument panel is shown.
OFF
Si
ON
N/0
N/C
SENSOR
OFF
ION
SENSOR
TO ALARM
TO ALARM
SYSTEM
N/C
SENSOR
FIG.
6- METHOD
I
S1
SYSTEM
N/0
SENSOR
n
OF ENABLING and disabling
sensors. Circuit -a shows connections tor
series- connected normally -closed sensors. Circuit -b shows connections for parrallel -connected normally -open sensors.
the front of the building to act as a
deterent to would -be burglars, or it can
be concealed inside of the house in such
a position that it can be heard equally
well inside and outside the building. In
either instance, the generator and its battery supply should be housed in a strong
burglar -proof box, and connected to the
control center either via an armor -clad
cable, or via cable that is concealed
within the plasterwork, etc.
The control center contains the electronics of the alarm system, together
with the systems battery supply, plus a
number of switches that enable different
parts of the system to be turned on or
off or to be tested. The center should
ideally be housed in a burglar -proof box,
and the connections to the sensors should
be made via armor -clad cable or concealed wiring.
Figure 5 shows a typical control center instrument panel, with five control
switches. It should be remembered that,
as shown in Parts I and 2 of this article,
certain sections of the alarm system (such
as fire sensors and panic facilities) must
permanently enabled, so the MAIN
switch controls the burglar alarm sections of the circuit only.
The auxiliary sensor devices, such as
flood, over -heat, power- failure, or gas leak detectors, are controlled by the
AUXILIARY INPUTS switch. The last three
switches enable individual sections of the
burglar alarm sensor system, such as the
front door, stair, or garage defenses, to
be connected or disconnected from the
circuit.
Finally, Fig. 6 shows the connections
for turning individual sections of the
alarm sensor network on and off. Series connected normally -closed sensor networks can be enabled and disabled by
wiring them in parallel with the MAIN
ALARM SYSTEM switch (SI), as shown in
Fig. 6 -a. The sensors are enabled when
SI is open, and are disabled when SI is
closed. Parallel- connected normally -open
sensor networks can be enabled and disabled by wiring them in series with SI,
as shown in Fig. 6 -b. The sensors are
enabled when S1 is closed, and are disabled when SI is open.
R -E
he
ALARM SYSTEM
Alarm system installations
Figure 4 shows how a complete alarm
system installation can be broken down
SENSOR
CONTROL
CENTER
NETWORK
ALARM-CALL
GENERATOR
4 -BLOCK DIAGRAM
alarm system installation.
FIG.
of
a
practical
into three basic 'blocks', namely, the
sensor network, a control center, and
the alarm -call generator. The layout of
the sensor network has already been
discussed, and is a matter of individual
decision.
The alarm -call generator can either
be mounted in a prominent position on
APOLLO AND SOYUZ ABOUT TO DOCK in the forthcoming Apollo Soyuz Test Project, as
seen by an imaginative artist. The vehicles will be interlocked with the help of a VHF Ranging System designed and built by RCA, and mounted aboard both vessels. Range is determined by transmitting radio signals from Apollo to Soyuz and retransmitting them to
Apollo. By measuring the time required to make the round trip, the distance between the
vehicles is monitored continuously.
52
www.americanradiohistory.com
All About
OSCILLOSCOPES
Oscilloscopes often look easy but there's more to them
then meets the eye. This article explores oscilloscope
specifications and features
by CHARLES GILMORE*
TO MORE COMPLETELY UNDERSTAND THE
oscilloscope, the exact meaning of the
numerous specifications applied to oscilloscope capabilities must be thoroughly
understood. The modern high- performance oscilloscope has many involved and
interrelated specifications indicating its
performance characteristics. It is extremely important when selecting an
oscilloscope that the measurement requirements be understood and that all
specifications of the instruments under
consideration be compared on an equal
basis.
Vertical bandwidth
Vertical bandwidth is one of the most
fundamental specifications of an oscilloscope. This specification, more than any
other, will determine the suitability of a
particular oscilloscope for the measurement job at hand. It is the goal of the
oscilloscope manufacturer to create a
vertical amplifier whose frequency response is constant until an upper frequency limit is reached, where a controlled roll -off (decrease in gain) starts.
The bandwidth of the oscilloscope is defined as the point at which the displayed
vertical signal has been reduced by 3 -dB
with respect to some low-frequency reference point. As vertical signals increase
in frequency, the oscilloscope should
continue to roll -off at a rate slightly
greater than 6 -dB per octave. This controlled roll -off is necessary to provide
proper vertical amplifier response to complex signals.
Oscilloscopes having a vertical frequency response which rolls off at a rate
considerably greater than 6dB per octave
will not faithfully reproduce the high
frequency components of complex waveforms. On the other hand, oscilloscopes
with insufficient high- frequency attenuation will tend to overshoot.
Note that a signal reduced by -3dB
is at its half power point, not half voltage point. At -3dB, the voltage is 0.707
of the reference value. In addition, a signal reduced in amplitude by 3 -dB due
to an increase in frequency has a large
phase shift with respect to the reference
point, normally in the area of 45 °.
Occasionally, the vertical bandwith of
an oscilloscope is specified with a deflec*Design Engineer Heath Company, Benton
Harbor, Mich.
tion limitation. Such a specification might
read 10 -MHz at 4- centimeter deflection,
8 -MHz at full deflection. This specification indicates the oscilloscope may not be
used at its full bandwidth if full deflection must be used. This specification is
popular with solid -state oscilloscopes that
have a limited vertical -plate driving capability. Generally speaking, most higher
cost modern oscilloscopes are not specified in this manner. However, one should
be cautious when purchasing a unit if
this will result in application limitations.
Oscilloscopes come with vertical amplifiers that are only AC coupled as well as
with vertical amplifiers having both AC
and DC coupling -usually switch selectable. AC /DC coupling is the most versatile, but AC-only coupling is generally
lower in cost. When an oscilloscope is
operated in the AC coupled mode, it will
exhibit an upper -3dB bandwidth caused
by the vertical amplifier high-frequency
roll -off and a lower -3dB bandwidth
caused by the low-frequency limitation
of the AC input coupling capacitor. The
-3dB lower- frequency limit is usually
2 to 10Hz. When AC coupled, the highest
potential that may be applied across the
input coupling capacitor must be specified. This is usually 400 to 600 volts. It
should be noted that this specification is
peak AC plus DC, not just DC.
The input mode selection may also
have a third position in addition to the
AC and DC positions described above
(See Fig. 1). This third position, usually
called ground, disconnects the input
connector from the input amplifier. The
input to the vertical amplifier is grounded. This feature is frequently used to
note the zero volt input position of the
trace on the CRT.
Risetime
Closely related to vertical bandwidth
vertical risetime. Risetime is defined
(See Fig. 2) as the time required for the
is
100%
90%
%-
10
0%
tR
TIME
2 -THE DEFINITION OF RISETIME. Fall
time is also defined in a similar manner.
FIG.
signal to increase in amplitude from 10%
of its total value to 90% of its total
value. The risetime specificatio of an
oscilloscope is important in determining
the limits of risetime measurements that
may be made by the oscilloscope. Rise time is directly related to bandwidth.
The formula is:
t, = 0.35 /FM
This equation gives the risetime in microseconds when the -3dB bandwidth is
given in megahertz. An oscilloscope
which meets this requirement gill have
proper high- frequency roll off.
Risetime is especially important if the
oscilloscope is to be used for pulse
analysis. If pulse analysis is of prime
concern, the oscilloscope shoul i ideally
have a risetime that is equal to or less
than 20% of the risetime of the pulse
to be measured.
1
.
Deflection sensitivity
FIG.
1
-A
CLOSEUP PHOTOGRAPH of the
vertical input of a Heath 10 -4510 dual -trace
15 -MHz oscilloscope. Notice the three position input coupling switch, with the center
position marked ground.
Vertical deflection sensitivity ranks
equally with vertical bandwidth as an
important oscilloscope specificat on. Both
of these limitations can prevent a measurement from being made.
The deflection or input -sensitivity
specification indicates the smallest voltage that will produce a standard deflection (usually 1 vertical divisio s on the
53
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CRT).* Stated in another way, deflection
sensitivity indicates the maximum vertical
amplification available. As a typical example, an oscilloscope might have a sensitivity of 10 -mV. This oscilloscope
would display a 10-mV peak-to -peak signal as 1 -cm high on the CRT. Note that
this is a peak-to -peak specification, not
RMS. A 10 -mV RMS sinewave would
cover approximately 2.82 divisions as a
10 -mV RMS sinewave signal is a 28.2 mV peak-to -peak signal. Sensitivity obviously costs money; therefore, the
amount of sensitivity required must be
weighed against the cost of the oscilloscope. Often the oscilloscope is utilized
with an accessory probe and this probe
acts as a voltage divider, reducing the input signal by a factor of 10 or more. If
this is the case, one must remember the
oscilloscope sensitivity is effectively reduced by the same factor. To obtain maximum sensitivity, some models offer increased sensitivity at a reduced bandwidth.
Oscilloscopes offering this feature typically give an additional gain of 10 at a reduction in bandwidth by a factor of four.
For example, a 10 -MHz oscilloscope
might maintain 10 -MHz bandwidth at
10 -mV per -centimeter. However, the input attenuator may be adjustable to 1 -mV
per -centimeter, but with a bandwidth of
only 21/2-MHz. Often this bandwidth is
adequate, as high-frequency signals may
not be of interest at high sensitivity levels.
The input attenuator
The maximum sensitivity of an oscilloscope cannot be used on all measurements. For example, a 10 -mV per centimeter oscilloscope with 6 -cm of total
vertical display will show an off screen
display for signals in excess of 60mV.
In order to overcome this problem, an
input attenuator is provided. This input
attenuator is usually one of two types.
On the simplest oscilloscopes, this may
be nothing more than a variable control, or at best, a three position switch
labaled X 1, X 10, X 100. In such oscilloscopes, the amount of attenuation and
the vertical sensitivity are generally
uncalibrated. The more sophisticated
oscilloscopes have an attenuator with
steps calibrated in resultant vertical deflection sensitivity. This is usually a 1 -25 sequence, although occasionally a 1 -310 sequence is used.
For example, let's take an oscilloscope
that has a basic deflection sensitivity
of 1 millivolt -per- centimeter. Due to
high impedances and stray capacitances,
a simple resistance divider will not maintain the same attenuation at high frequencies as it does at DC. To correct this,
the input attenuator must be capacitivly
compensated. With compensated attenuators, attenuation is constant at all frequencies.
*Many of the older oscilloscopes used full screen or one -inch as a standard. Generally,
the change to more modern oscilloscopes
has seen a change from a full- screen specification to a per-division specification. Time base specifications reflect this as well. The
recurrent sweep was specified in terms of
frequency of a sawtooth wave which covered the full display area; newer designs
specify time -per-division.
The step attenuator has a disadvantage in that it will not allow signals of
any arbitrary amplitude to be made
exactly full -scale or some other desired size. To permit such operation, most
oscilloscopes include a variable control
that adjusts the effective attenuation between the indicated value and its next
highest position. For example, an oscilloscope used at 500 millivolts -per-division
can be adjusted continuously between 500
millivolts -per- division and 1 volt (1000
millivolts) -per- division by use of this
control. The variable control will have
a CALIBRATED position (normally, extreme clockwise). In the CALIBRATED position, the deflection factors indicated on
the step attenuator fall within the accuracy limits set for the oscilloscope.
INPUT
Accuracy of attenuation is normally ±3
to ±5 percent. Vertical accuracy specifications also include any inaccuracies
found in the vertical amplifier. Accuracies
are frequently not specified at the high
frequency limits, at temperature extremes, nor on extremely low cost
instruments.
Input impedance
For most service work, a high input
impedance is desirable. One megohm
has been chosen as a standard. As was
noted in the discussion on attenuation,
there is capacitance involved with attenuators. Therefore, the input impedance
specification of an oscilloscope includes
the value of capacitance found in parallel
with the 1-megohm resistance. This
capacitance usually lies in the area of
20 to 40 pF, if the oscilloscope is designed to be used with a divider probe.
Obviously, the lower the capacitance the
better. Other impedances have been used.
Some of the older very low cost oscilloscopes have inputs ranging from 100K
to 10 megohms. Some of the very sophisticated high- frequency oscilloscopes built
today have a nonreactive input for their
150 MHz -plus capability.
Input connectors
Most oscilloscopes are provided with a
BNC input connector. This is the most
desirable, considering the availability of
cables and probes with mating BNC connectors. Other input connectors used are
the 3- or 5 -way binding posts (generally
used on very low cost oscilloscopes) and
the UHF connector (SO -239) found on
some older models (see Fig. 3).
Positioning range
Vertical amplifiers are provided with a
continuously variable control permitting
the operator to adjust the vertical position of the trace. The range of the position control and the effect of extreme
positioning will be different for different
oscilloscopes. The range of the position
control is measured in windows. A window is the full distance across the CRT
in the direction of interest. For example:
an oscilloscope specified as having two
vertical windows is capable of deflecting
a waveform occupying the full vertical
display area upward to the extent that
the bottom of the waveform is at or
above the display center line. The con-
58
www.americanradiohistory.com
-
FIG. 3
COMMON INPUT CONNECTORS
used for oscilloscopes. The BNC (bottom),
the 5 -Way (top), and the UHF (middle). Most
frequently the vertical input will be one of
the coaxial types; however, the horizontal
and trigger inputs may be 5-Way.
trol should also be able to deflect the
trace downward until the top of the waveform will be at or below the center
line. When the position control is adjusted to either of these extremities,
there should be no on screen distortion
of the waveform. The position control
may have more range, but beyond the
two windows (one window on screen,
one half up, and one half down) there
may be distortion of the trace. Vacuum
tube oscilloscopes tend to have a larger
number of vertical windows. The more
modern solid state oscilloscopes are frequently limited to two windows, and
many have as little as one and one half
windows.
Vertical delay lines
To correct for trigger and sweep startup, a delay line is used in the vertical
amplifier circuit. The object of the delay
line is to uniformly delay signals of all
frequencies by an amount slightly greater
than the time required to permit triggering, start -up of the sweep circuits, and
unblanking of the CRT before the triggering signal is presented to the CRT.
Specifications will indicate the amount
(number of nanoseconds) of pre -triggered waveform which will be displayed.
Delay lines are generally some form
of transmission line and they are expensive, but they are essential for good
pulse analysis work. Today this is especially necessary with the use of digital
circuitry, where the measurement of
pulse risetime may be critical to the
proper operation of a circuit.
fastest sweep speed should present no
less than three complete cycles of a
waveform whose frequency is identical
to the vertical bandwidth of the oscilloscope. For example, a 10-MHz oscilloscope would require an upper sweep
speed of
As noted earlier, recurrent -sweep is the
simplest form of time base available. The
recurrent -sweep time base offers no way
of making calibrated time measurements
except by comparison. The recurrent sweep specifications indicate the upper
and lower frequencies of the sweep oscillator. The frequency can be changed with
a variable control within a decade range
and over multiple decades in switched
steps. A sweep oscillator frequency range
from 5 Hz to 500 kHz is typical. Converted to time -per- division, assuming
there are 10 horizontal divisions, this
gives an equivalent range of 20 ms -perdivision to 200 ns-per -division. A few
oscilloscopes make provisions to lower
the sweep oscillator frequency by use of
an external capacitor.
The recurrent -sweep time base may also have a control to adjust the amplitude of the synchronizing signal injected
into the sweep oscillator from the vertical amplifier. Switch selection of posigoing syntive ( +) or negative (
chronizing signal is frequently made
available. Often this same switch will
permit positive or negative synchronization on an external signal or a sample
of the powerline frequency.
X
10 X 10°
-
300 ns for
the full horizontal span, or 30 ns -perdivision. This requirement would be
met by an oscilloscope time base having
a maximum speed of 200 ns -per- division
and a X 10 magnifier yielding a 20 -ns
per- division display.
For low bandwidth oscilloscopes (3 -5
MHz), the fastest sweep speeds are in
the area of 1 to 0.5 us -per- division and
sweep speeds of 0.2 0-per-division to
0.5 µs -per- division are common on 50
MHz oscilloscopes. Although the time per- division may be stepped in either a
-2 -5 or -10 -100 sequence by the time
base switch, there is usually provision to
vary the time -per- division continuously
between steps with an uncalibrated control. Accuracy of the time base is usually
±5 to ±3 percent. Time base speeds are
often affected by temperature, line voltage variations, and age, so they should,
not be used as ultimate standards of time
comparison.
1
Recurrent sweep
3
1
Triggering controls
The triggered oscilloscope gains much
of its flexibility from the various modes
of operation which may be selected for
the time base trigger circuits. The trigger
MODEL
80 -4510
TIME
CM
-)
Calibrated sweep
Oscilloscopes with a calibrated -sweep
permit the user to make time measurement, and as a result, specifiications
with accuracy limits as opposed to the
operational characteristics of the recurrent- sweep. The period of the time
base is selected by time -per- division.*
The switch sequence is either decade
(on lower cost oscilloscopes) or 1 -2 -5.
Slowest sweep speeds vary with the
manufacturer and the price of the oscilloscope, but usually are in the vicinity of
200 ms -per- division to 2 seconds- per -division. The fastest sweep speeds are dependent upon the bandwidth limit of the
oscilloscopes. A rule of thumb is the
*The majority of oscilloscopes use the
centimeter as the basic horizontal and vertical division. There are some oscilloscopes,
however, with vertical divisions slightly
longer or slightly smaller than a centimeter.
For this reason, the general term "division"
will be used.
-
FIG. 4
THE TRIGGERING AND SWEEP
CONTROLS of the Heath 10 -4510 dual trace
15 MHz oscilloscope. Note that in addition
to source and slope selection, the operator
may also select DC, AC, or ACF (AC
coupled through a 15 kHz high pass filter)
coupling. The automatic mode is selected
by full counter -clockwise operation of the
trigger level control.
signal, taken from the vertical amplifier,
is used to start the sweep generator. Variations on the trigger signal include selection of positive or negative triggering,
level of triggering, AC or DC co.pling,
high or low frequency filterihg and
an
selection of trigger source inclu4:
external source, the power line as well
as the vertical amplifier channel:. Each
of these features adds to the at qty to
observe complex waveforms, (see F g. 4).
Older oscilloscope designs also incorporate a stability control which a::sts in
proper operation of the trigger rcuits.
The stability control is adjusted p for to
using the trigger level control. Generally
speaking, stability controls are not found
on modern oscilloscope designs.
The method of defining trigger sensitivity and triggering bandwidth are not
consistant. The following are Heath
Company standards for such measurements. Trigger sensitivity indicates the
smallest deflection (or extertral input
level) that will permit a stable trace on
the face of the CRT. Sensitivity of 1
division or less is desirable. An ascilloscope requiring more than 1 division of
vertical deflection in order to maintain
a stable display does not have soTicient
trigger sensitivity for many applications.
Trigger bandwidth can be defused as
the highest frequency at which a stable
trace can be maintained with some nominal deflection (often one di lion).
Trigger bandwidth determines the ease
with which the oscilloscope will rigger
on complex waveforms and whit the
stability of high- frequency signah will
be. An oscilloscope with a trigger bandwidth twice the vertical bandwidt-, provides exceptional triggering performance,
while one with a triggering bandwidth of
less than its own vertical bandwidth
creates difficulties when complex waveforms are being observed.
g
Time -base modes
The time -base generator itself 'usually
has two modes of operation, normal, and
automatic (auto). In the normal mode,
the sweep generator is cycled by each
trigger pulse, which follows the completion of a sweep and hold -off period. In the
automatic mode, the oscilloscope automatically generates trigger pulses in the
absence of a signal in the vertical amplifier. This provides an automatic baseline
(trace) during the absence of a vertical
signal rather than the blank CRT evidenced by no signal in normal male.
Some oscilloscopes provide a time base
mode called single- sweep. Single -weep
permits the operator to select a set of
conditions that will trigger the ;weep,
and then "arm" the sweep. When the
particular set of conditions occurs, the
time base will be activated for one ;weep
and then remain locked out um '1 rearmed. This mode is especially useful
when attempting to observe fast events
occurring randomly and at wide ,read
intervals. Frequently, such events will be
recorded by an oscilloscope camera.
Horizontal bandwidth
As the main requirement of the horizontal amplifier is to pass the sweep sig(continued on page 82)
59
www.americanradiohistory.com
Step-by-step
TV Troubleshooters Guide
Troubleshooting a television receiver that has been struck
by lightning isn't difficult if carefull analysis
and step -by -step procedures are used.
by STAN PRENTISS
WHEN LIGHTNING STRIKES
A
VACUUM
tube or a transistor television set, the
problems often differ, but lots of work
and careful analysis can cure the
problems just the same. High input
impedances in tube receivers plus
larger turn-on potentials and more ac
coupling usually prevent the lightning
arc from penetrating much beyond the
i.f. amplifiers or power supply. But
with small signal devices and a great
deal of do coupling, there are relatively more damage -susceptible base -toemitter and base -to- collector junctions
combined with well -known bipolar
tendencies to short. As a result, solid state receivers can have additional
subsystems affected other than tuners,
i.f. strips, and power supplies
least
-at
this one did.
When delivered to the distributors,
the complaint tag read: "Fuse blows
after warmup, brightness can't be controlled, contrast won't work, too much
video noise, no picture, hit by lightning." The set was a 19DC22 Zenith
with 4 receiving tubes, 5 IC's, 15
transistors, and a high voltage tripler.
Now, since the receiver came from a
local TV shop (or, in a similar instance, from an "electronics enthusiast") , the initial procedure is a careful visual inspection for severed wires,
dangling components, poor or wrong
connections, burned areas, and missing
or damaged circuit boards. Indeed,
one side of the pincushion transformer coil was disconnected, a number of
capacitor and resistor leads clipped,
left open, or rejoined with a smear of
solder, and a few bare wires crunched
together. All these have to be reconnected, separated, and secured before
troubleshooting procedures are begun.
With the various circuits restored
to their probable operating conditions,
the immediate reaction is to turn the
set on. But don't you dare! Remember, this receiver has raster but no
picture, will blow power supply fuse
and has all its lightning-developed
troubles plus others that may have
been around before the lightning bolt.
With another tuner in place, however,
the picture is still far from satisfactory,
and there are either potential i.f. or
agc problems yet to be detected and
conquered.
In many of the newer receivers
just as in this Zenith -most operational sections are located on plug -in
boards. So several screws later, the
i.f. strip is disconnected and replaced
as well as the IC on the video processor module that supplies sync, video,
and agc outputs to the rest of the receiver. Now, indeed, a picture does
appear that is somewhat recognizable,
but the brightness control remains
limited, contrast advance produces
rippling distortion when turned toward maximum drive, and there is no
So approach the problem carefully,
deliberately, and in low gear.
Step-by -step
First, try a substitute tuner for at
least vhf (uhf too, if possible) and
also a preliminary i.f. check. If a substitute tuner isn't available, just disconnect the old tuner from B+ as well
as the i.f. cable, then turn the set on.
As expected, the fuse does not blow,
the 24-volt regulator output is acceptable, and there is no special drain on
any of the power supply voltages
they're fine. So you either repair the
tuner yourself (maybe only a transistor), send it out to a specialty house
such as Castle, PTS, etc., or install an
exchange tuner supplied by Zenith.
-
-
THOR'S
THUNDERBOLT
NO PIX
NO SOUND
NO RASTER
1
POOR PIX
SOUND OK
CHECK VIDEO
rlCHECK BOTH
LOW AND
HIGH VOLTAGES
GOOD
h
DETECTOR OUTPUT
FIND BRIGHTNESS
LIMITER OR
LUMINANCE AMPL
PROBLEM
BAD
VARY AGC FROM
SATURATION TO
BAD
REPAIR TO
RESTORE POWER,
FLYBACK, AND
AGC ACTION
CUTOFF (FOR MOST SETS)
OK
OK
LOOK FOR TROUBLE
IN 3RD I.F. OR TUNER
O'
LOOK FOR PROBLEM
IN LUMINANCE AMPS
PROCEED TOWARD
NO
TUNER
OK
t
ANTENNA
MAY BE
AFFECTED
OVERRIDE OR
SUBSTITUTE
AGC WITH EXTERNAL
VOLTAGE SOURCE
VIDEO PROBLEM
REPAIR
BREAKDOWN
CHECK AGC OPERATION
BY MEASURING VOLTAGE
CHANGE AT 1ST I.F. INPUT
WHEN VARYING AGC CONTROL
INADEQUATE
3V TO 5V CHANGE
OFTEN ADEQUATE
TAKEOFF
NO
[REPAIR AGCI
REPAIR I.F.
OK
LOOK FOR SHORT
AT OR BEFORE 3RD
I.F. AND SOUND
OK
FIND TROUBLE
FAULT
IN 1ST OR 2ND I.F.
(AGC WON'T
RESPOND IF
IT IS SOLE
PROBLEM)
NO
REPAIR AGC
OR AGC
I
AGC AMPLIFIERS
NO
1
REPLACE
TUNER
THIS IS A DIFFICULT CHART because tube and transistor sets react differently, especially
when luminance is ac coupled, or agc is composite- waveform detected instead of just the
sync tips. So we proceed in several different directions to cover most situations.
60
www.americanradiohistory.com
TEST POINT
5%
2%
5pF
1K
R 124
FROM 4TH
I.F.
TRANS
3.9K
5/
4.25pF
±.25pF
5%
.05
5%
27µH
CR101
10052
I
C137
220pF
-834
-895
5%
R230
1K
47052
33052
5%
5pF
125pF
=
C218
390pF
' Q207
1EC217
2200pF
1KV
OUTPUT
LIMITER
10;42
R244
-695
352
BRIGHTNESS
.22
R: 46
+24V
Q204
121
PEA00K
R24
vY0
5.6K
2W
12K
82:62
2252
121-888
VERTICAL
68K
R138
5K
BRIGHTNESS
47052
390K
CONTRAST
TO T13
AT 9-82
MODULE
PULSE
5%
.5µH
+24V
C213
IK
C216
3900pF
VERTICAL
BLANKER
TO VIDEO
PROCESSOR
BLANKING
l
127
680G
121
1ST VIDEO
5%
R
OR
+24V
L205
NP
0105
121
DET
-744
7.3V
31
25
i-.15V
VIDEO
..5µH
2ND VIDEO
100pF
L113
TRAP
4.5 MHz
-
0205
7.5V
330pF
3.6pF
±.25pF
27µH
Is'
121
33K
204
L203
14.8V
9 0S2
5%
2%
L202
58µ H
1.3K
+24V
1.5K
j47K
CR 03
PIX
R234
1.3K
=CR210
5%
+24V
HORIZ FLYBACK
T
BLANKING
PULSE
14.5V
0206
14.7V
ACROSS
121
-952
3RD VIDEO
SW201
VERT
OUTPUT
CATHODE
SETUP
U4
NORMAL
RESISTOR
1S2
9 -37
INTERLOCK
22K
5.6K
FIG.
1- SCHEMATIC
OF ZENITH 19DC22 showing the brightness limiter, blanking, and video
amplifier stages.
color.
Obviously there are difficulties in
the video amplifier section also, and
the lack of color may either result
from this problem or can be a separate
fault of its own. Again, the procedure
is simply step -by -step. However, instead of replacing parts and semiconductors wholesale, a little circuit inspection is often helpful in these or
any other circumstances to prevent
wasting both time and parts. A few
minutes spent in rational contemplation may save hours of frantic futility.
So with tuner, i.f., and agc sections
repaired and in operation, let's look
at the rest.
Video amplifier analysis
The schematic in Fig. 1 shows video
being envelope detected through half wave rectifier CR101, and sound
trapped by L113, a special non- distorting inductor and resistor- capaoitor
T3
TO COLO
3
VIDEO OUTPUT
EMITTER;
combination (R124 -C137) used to reject the 4.5 -MHz signal and prevent
possible 920 -kHz beats between the
3.58 -MHz chroma sidebands and intercarrier sound. L114 in the collector
circuit of Q105 is a channel-8 self resonant coil. The video signal, still in
negative polarity, is developed across
R127 and routed to both the video
processor module and to the 2nd
video amplifier Q205. The emitter circuit of Q205 has a C216-L205 broadly -tuned parallel trap normally set to
remove stray 3.58 -MHz chroma information that does not belong in the
luminance channels. The video signal
from the collector of Q205 now proceeds through peaking coils L202L204 and the L203 delay line- necessitated by slower moving, narrower
to the base of the
passband chroma
3rd video amplifier Q206. This is a
PNP follower stage, whose emitter is
clamped by the Zener diode CR213.
-
Two of these three video am vilifying stages have additional controls.
The brightness limiter, connected to
one end of the contrast control will
conduct harder when there is additional high voltage demand. Lowering
the dc potential on this control and,
consequently, the base drive of the
video amplifier, will reduce cathode
ray tube beam current. There are also
horizontal and vertical blanking pulses
-both positive in polarity-connécted
to the emitter of the second 'Tdeo
amplifier Q205. During the 1.4 -ms
field retrace, Q205 is back biased and
cut off by a positive vertical pulse on
its emitter, and during horizontal retrace, by an 11.1 As positive viulse
to the same emitter. Consequentl}, the
2nd video amplifier and the remainder
of the luminance circuits are blanked
at both field and line rates to securely
cut the pix tube off during these s ynctiming intervals. There is also t dc
61
www.americanradiohistory.com
brightness control in the emitt e of the
2nd video amplifier that biases this
stage from the +24 -volt line, and also
an RC peak picture potentiometer capacitor arrangement which, when
tuned, rolls off high frequency response
by producing degeneration in the same
amplifier. All right, now that the theory
is developed, let's get to troubleshooting.
Oscilloscope to the rescue
Since the +24 -volt bus supplies most
transistors and all IC's, and you've already established that enough current
isn't being drawn to blow 24 -volt regulator fuse, the best means to tackle
this problem is with a dc oscilloscope.
Why dc? Because you'll need to read
both dc levels and ac amplitudes
simultaneously to correlate your information. Time base and its reciprocal,
frequency, are incidental, since the
problem is loss of luminance and
chroma. First, let's tackle the luminance breakdown; and to do this we'll
work slightly backwards, exactly as
you would do if there was an i.f. fault.
Our basic problem appears to be the
waveform at the base of Q206 shown
in Fig. 2 (upper trace). Instead of
some seven volts in amplitude, this
trace barely measures six volts and is
hardly more than a smear where separate video and sync levels must appear. The blanking pulse at the emitter
of the vertical blanking amplifier is
precisely 18 volts (Fig. 2, lower trace)
as it should be, and requires no further
consideration. However, the waveform
at the emitter of the 2nd video amplifier contains the same distortion, while
the base of this transistor has a fixed
dc value, regardless of contrast control setting, and exhibits additional distortion whenever the contrast control
tries to increase bias. A quick check of
the brightness limiter confirms that it
will control picture tube blooming by
simple, manual adjustment -so it, too,
can be eliminated.
But how do you decide whether
Q205 or Q206 is at fault? In this instance, since they're dc coupled, by
deductive reasoning. Luminance and
contrast are both affected, remember,
and the 3rd video amplifier emitter
follower is a larger metal case transistor that undoubtedly has greater emit-
in dc level. The 3rd video amplifier, of
course, tells us the rest of the luminance channels are all right and, loand-behold, excellent contrast with
very black vertical, broad bars appear
on the receiver's pix tube. This means
the luminance problems are over, but
there's still no color. A sensitive finger
tip, however, soon fixes that. The
chroma amplifier IC on the chroma
module assembly (not shown) is rather
warm to the touch, and a simple substitution restores all color bright as
ever.
-A
FIG. 2
BREAKDOWN at the base of the
3rd, video amplifier is evident in top traces
Bottom trace shows a good vertical blanking
pulse at the emitter of the vertical blanker.
42.17 -MHz chroma and 45.75 -MHz
video carrier markers are off somewhat more than their nominal 50 percent points should tolerate. Therefore,
a little tweaking of the mixer coil is in
order, and they're virtually balanced
(See Fig. 5) . The "haystack" is now
ready to go to work with full bandpass
chroma and luminance, and no i.f.
waveform tilt to disturb color.
R -E
FIG. 3 -T14E EMITTER of the first video amplifier is good as shown in top trace. Bottom
trace shows the base waveform of the 3r1
video amplifier when repaired.
RESISTIVE AND REACTIVE CIRCUITS, by
Albert Paul Malvino. McGraw-Hill Book Co.,
1221 Avenue of the Americas, New York, NY
10020. 592 pp. 91/4 x 71/4 in. Hardcover
$12.95.
A comprehensive textbook that provides
,
!PP
I"'
..
riM.
FIG. 4-SWEPT RESPONSE at iritial mating
of new tuner and i.f. strip -slightly off
ter -to -base breakdown and power
handling ability than the 2nd amplifier, which is a small signal device. So
pull Q205 out of its holder and replace it.
Video once more comes booming in,
as the emitter of the 1st video amplifier produces a good composite waveform -Fig. 3, upper traceand the
base of 3rd video amplifier (Fig. 3,
lower trace) responds with good video
and sync separation and also a change
Final touch up
Yes, i.f. response curves do change
as illustrated in Fig. 4. Although the
41.25 -MHz sound carrier and 47.25 MHz lower adjacent channel sound
carrier traps are exactly in place, the
5 -MIXER COLLECTOR COIL tweaking
balances video carrier and chroma subcarrier markers.
FIG.
62
www.americanradiohistory.com
all the information needed to prepare a technician for more advanced electronic courses.
The first part of this book discusses resistive
circuits with dc or ac sources as these are
very prominent today because of direct coupled circuits. The second part of the
book covers reactive circuits such as transients, ac theory without using trigonometry
or complex numbers. The final section of the
book which does require a knowledge of
trigonometry goes into extensive coverage
of things such as phasor analysis, resonance
and instantaneous ac analysis. Definitely a
textbook quite valuable to anyone who wants
to more fully understand both resistive and
reactive circuitry.
-
SIMPLIFIED COMPUTER PROGRAMMING
THE EASY RPG WAY, by Kelton Carson.
TAB Books, Blue Ridge Summit, PA 17214.
240 pp. 81/2 x 51/4 in. Hardcover $8.95; Soft cover $5.95.
A computer, being a very complex system, requires literally thousands of steps
and instructions to perform even a simple
operation. The instructions are provided by
a program which may be compared to a list
of instructions for computing the square
root, for example. Rather than actually write
out the thousands of instructions for a cornouter, the programmer uses a language to
have the computer prepare a program for
him. By doing this, all that is left for the
programmer is to write a few instructions in
a few simple forms. The computer then
translates the simple people language of the
forms to the complex machine language of
the computer. This book shows how it's
done.
MAKE PA WORK
(continued from page 47)
its angle of coverage slightly overlaps
that of the speaker next to it. Coverage
angles will usually be specified by the
speaker manufacturer in the form of a
polar response graph as shown in Fig. 6.
This particular speaker (Fig. 5) provides
coverage over a 140 degree angle in the
horizontal plane.
In rooms with high ceilings, speaker
clusters may again be used. In this case,
it may be necessary to tilt some of the
speakers vertically in addition to overlapping their horizontal directional patterns. To make sure coverage is adequate, it is wise to walk around the entire listening area while the speaker is
in operation, adjusting the position of the
speakers for an even sound -level throughout the room.
Reliability
It should be obvious that reliability is
a most important characteristic of good
sound reinforcement equipment. Yet we
still hear about microphones that "died,"
power amplifiers with shorted output
transistors and speaker voice coils that
opened up. To avoid these problems,
choose rugged, conservatively designed
equipment, read the instructions and use
the equipment properly.
Microphones for sound reinforcement
use must be particularly rugged. They
must be impervious to corrosion and
strong enough to withstand accidental
drops onto a hard stage. They must include built -in dust filters to prevent
foreign particles from reaching the microphone diaphragm that could cause
noise, distortion, or eventual failure.
Microphones which can withstand recording studio use may not be rugged enough
for sound reinforcement applications.
Power amplifiers, mixers, and other
electronic equipment should be capable
of operating properly over a wide range
of AC line voltages. It is not uncommon
to find AC line voltages as high as 130
volts. And for large outdoor concerts,
perhaps operating from portable generators with long AC extension cords, AC
line voltages as low as 90 volts are sometimes encountered. It is a good practice
to check out all electronic equipment
with a variable voltage AC supply to
make sure performance is not degraded
within the range of expected AC line
voltages.
The power amplifier in a sound reinforcement system must be reliable under
all possible conditions of use. In addition to amplifying the output of the mixer or console, it must provide a good
match to the speaker system in terms of
power capability and impedance rating.
Even though many ambiguous power output specifications are still being used, the
sound technician is primarily concerned
with the continuous power output that
the amplifier can deliver to its rated load
impedance. Fortunately, most commercial
power amplifiers intended for sound reinforcement rather than home entertainment use are specified in this manner. A
good commercial -grade power amplifier
should be capable of delivering this power indefinitely without blowing fuses or
overheating, even while operating in a
rack cabinet containing many heat -producing devices. A power amplifier designed for sound reinforcement should
be capable of withstanding a shorted output for long periods of time. Figure 7
shows a typical power amplifier suitable
for sound reinforcement use. Many high power amplifiers designed for home
FIG. 7 -SHURE SR105 POWER AMPLIFIER.
stereo systems are not adequate for commercial use due to inadequate protection circuitry and low thermal dissipation capability.
There are two primary aspects of loudspeaker reliability. These are the power
handling ability and environmental protection. Loudspeakers are generally supplied with a rated maximum power
handling capability in watts. Unfortunately, not all speaker manufacturers use the
same methods for determining this rating. In general, speakers are rated in
terms of maximum watts of program
material rather than continuous sine
wave power. It is essential to determine
the maximum power capability of each
speaker in use and make certain that the
maximum rating will not be exceeded.
It would be easier to match speakers
to power amplifiers if the speakers were
rated in terms of the maximum voltage
which should be applied to them, since it
is relatively easy to determine the output voltage capability of power amplifiers.
TABLE
Lo -Z Microphones
Hi -Z Microphones
Lo -Z Mixer Input
Hi -Z
Mixer Input
Line Level Mixer
Output
Power Amplifier
Input
Auxiliary Unbalanced
similar situation exists at each ir terconnection point in a sound system. If a
sound system is constructed of components that are supplied by a single manufacturer, then interconnection should present no problems. But, if equipment is
supplied by various manufacture's, it is
necessary to pay particular attention to
clipping levels, normal operating levels,
impedances, gain, and noise speficiations.
Table 1 serves as a guideline for interfacing system components according to
their voltage levels. All of the \oltages
shown can be expressed in dBv, which
means dB relative to 1.0 volt. This should
not be confused with levels expressed in
dBm, which means dB relative to O dBm.
The reference "O dBm" is the voltage
necessary to produce 1 milliwatt of power in 600 ohms (0.775 volt rms). If an
impedance other than 600 ohms s used,
it is necessary to add or subtract a correction factor to take into account the
different impedance. It is convey Tent to
express voltage levels in dBv, bemuse no
particular value of impedance is implied.
When interconnecting two pieces of
equipment, it is advisable to have about
10 to 15 dB of "head room." This means
that the average signal level at the interconnection should be at least IC to 15
dB below the output clipping leve of the
unit supplying the signal and IC to 15
dB below the input clipping level of the
following unit.
In any sound reinforcement system,
the user will encounter several pieces of
equipment, each with at least ore level
control. Overall, there may be t free to
six level controls, each capable of affecting the overall level in the room.
Obviously, there will be many different
ways of setting these several controls
that will yield the proper overa gain.
Unfortunately, many of these possible
ways will yield either clipping at some
point or too much output noise It is
best to read the manufacturer's nstruc1
.
1- TYPICAL VOLTAGES AND IMPEDANCES
Impedance
Ohms
Typical
Voltage Range (V)
50-250
20K to 100K
300 to 2.2K
0.1 mV to 100 mV
1.0 mV to 1.0V
30 mV to 1.0V
50 to 600
(clipping level)
320 mV to 10V
(clipping level)
1V normal
5K to 100K
10V peak
0.5 to 2.0V
10K to 100K
0.1Vto1.0V
50K to
1
meg
Voltage Range (dBv)
-80
to
-2C dBv
-60 to (
-30 to
C
-10 to
dBv
dBv
+2C dBv
0 dBv nc rmal
+20 dBv :eak
-6.0 to +6.0
-20 to
C
dBv
dBv
Accessories
Loudspeakers that will be used outdoors should be weatherproof. These
speakers are constructed with waterproof drivers, special glues and corrosion -proof hardware. Speakers intended
for portable applications should be particularly rugged
Equipment compatibility
We have already mentioned that speakers and power amplifiers must be matched in terms of power compatibility. A
tion books in order to determine optimum level settings. In general, it is desirable to set level controls near the
front of the system as high as possible,
consistent with adequate input clipping
levels and adequate mixing range Level
controls near the power amplifier end
of the system generally should b.! operated at reduced levels that still allow the
power amplifier to develop full output
power. In this way, a good signal t noise
(tun! page)
ratio will be preserved.
c
r-
CJI
63
www.americanradiohistory.com
Other considerations
We have discussed six significant problem areas common to most sound reinforcement systems. There are many other
problems that can arise in specialized
systems, and naturally, the problem you
experience at the moment is worse than
any other. To complete our discussion
of sound reinforcement systems, four
other areas deserve attention. These are
stage monitors, portability, specialized
accessories and safety.
Stage monitoring
The popularity of musical instruments
located close to the vocal microphones
has created a problem by making it difficult for a vocalist to hear his own
voice. To solve this problem, a second
totally independent sound system is used
to provide stage monitoring.
To establish a monitor system, the
audio console shown in Fig. 4 is equipped with individual monitor selection on
every input channel and a separate monitor output for power amplifiers driving
speakers on the stage. This hookup is
shown in Fig. 2. The monitor system is
capable of providing an independent
selection of any voice or instrument on
stage. The main criteria for choosing
monitor speakers are peak -free frequency
response, medium to high efficiency and
small size.
Portability
Portable sound systems are becoming
more common as a result of their flexibility. The system shown in Fig. 2 could
be a portable system that might be moved
from auditorium to gymnasium to meeting room all in the same day. Professional entertainers prefer to travel with their
own complex systems to assure consistent
results, rather than perform using an inferior "house" installation. Some factors
that must be considered when choosing
equipment for portable applications are;
size, weight, ease of operation and hookup, and the availability of rugged portable shipping cases.
An example of a portable system is
shown in Fig. 8. In the photo is the console shown in Fig. 4. The power of amplifier shown in Fig. 7 and a pair of
FIG.
8
system.
-
PORTABLE sound reinforcement
portable speaker columns complete the
system. The console and power amplifier
are in portable cases, that also provide
room for the console -to- amplifier cable.
The speakers also have cable storage
space. This entire system can easily be
carried in a station wagon and it can
be set up in minutes.
TESTS SANSUI QRX -6001
(continued from page 34)
R -E
Accessories
Many accessories and techniques are
available for advanced sound reinforcement systems. A brief description of
some of these is included, but a detailed
study is beyond the scope of this article.
A real -time spectrum analyzer is a tool
that greatly simplifies the equalization of
a room. When used with a calibrated
test microphone and a pink noise generator, the real -time analyzer displays the
average energy in each fractional octave
band of the sound field produced by the
speaker system at the location of the test
microphone. A perfectly flat system
equalization would appear as a straight
line across the display of the real -time
analyzer.
In large halls, speakers are placed in
different locations throughout the hall to
form a distributed speaker system. A
70.7 -volt power amplifier is used to keep
power losses in the speaker lines to a
minimum. At the speaker, this higher
voltage is coupled through a matching
transformer to drive the low impedance
speakers. In these systems, electronic
(digital) delay devices can be used to
reduce echoes.
Microphone placement for stage musicals and theatrical productions has always been a perplexing problem. The
stage -mounted microphone stand shown
in Fig. 9 aids distant sound pickup on a
hard -surfaced stage. By keeping the microphone close to the stage floor, phase
FIG. 9
-
STAGE-MOUNTED MICROPHONE
provides superior sound pick -up on hard surfaced stages.
cancellation due to reflected sound is
minimized; this results in a greater output
level and frequency response. In addition,
the stage -mounted microphone stand can
be hidden along the stage apron or behind footlighting.
For special effects, tape echo units,
tape and digital delay devices, limiters or
compressors, balanced modulators, electronic phasing (flanging) effect devices
and keyboard synthesizers are sometimes
interfaced with the sound system. The
majority of these devices are electrically
unbalanced and designed to interface
with the audio console at an output level
approximately 0.5 volts. To accommodate
the input and output of these accessories,
the console should have a pair of "link
jacks" that break into the console signal
path at the correct level. Tape recorders
and synthesizers can be plugged into the
console's auxiliary inputs directly, and
balanced line -level equipment can be
used on the line -level output of the console to drive power amplifiers.
R -E
64
www.americanradiohistory.com
"open circuit," referenced to maximum
input sensitivity. The 63 dB measurement under these circumstances, is a
highly acceptable hum and noise figure.
Overall, the amplifier section is somewhat more conservative in design and
ratings than the tuner section, and both
the matrix and CD -4 circuitry performs
well. Our amplifier section rating, therefore, moves up to the "very good" classification.
Utilization and listening tests
Controls are easy to use, and only a
few minutes of familiarization with the
front panel is required by anyone confronted with the receiver. The instruction
manual is well written and includes many
illustrations. We appreciated the "click
stop" positions of the tone and balance
controls that enabled us to return to preferred settings easily. Most of our listening test was confined to playing QS and
SQ encoded discs, with a sprinkling of
CD -4 discs thrown in. The QS Variomatrix system is an outstanding technological achievement -and works well for
quadriphonic FM broadcasts as well as
for QS encoded records. Two FM stations
in our listening area use the QS encoding system, and listening to them over a
set designed specifically for this format
was a revelation.
As for the audio amplifier section, the
low damping factor seemed to have no
degrading effect on the bass we heard,
and power output was more than adequate for our high -efficiency floor standing speaker systems, both in stereo and
in 4- channel listening. Bear in mind that
the Sansui QRX -600 does not include
the so-called "strapping" or paralleling
feature common to other 2 /4- channel
receivers. For this reason, it should be
considered only by those who plan to
equip their listening roms with four
speakers at the outset.
Our capsule summary, along with
overall comments, is tabulated in Table
III. We encountered no unusual heat
problems when operating the QRX-6001
receiver over extended periods of time
for high -level musical listening. The receiver also withstood its pre- conditioning
tests at one -third continuous power output for one hour. Limited test time precludes our making a statement regarding
long-term reliability and service -free performance. However, the physical layout,
construction and short -term performance
would indicate that the receiver is conservatively and well designed from this
point of view as well.
R -E
R -E's
High -voltage
hold -down circuits
Part III:
These circuits can produce
some strange reactions
by JACK DARR
SERVICE EDITOR
Service Clinic
The collector of the limit -switch transistor is directly connected to the. anode
of CR214, in the 24 -volt regulator transistor base. So, the voltage drop from
HERE IS THE CONCLUDING PART IN THIS
series of articles describing the new high voltage hold -down circuits. The RCA and
Zenith circuits are covered.
Zenith's 25CC55 power supply chassis
uses a limit- switch transistor and circuit
for the hold-down function. Figure 6
shows this circuit. A special polarized
neon lamp is connected into the base
return of the limit- switch transistor Q209.
A pulse from the flyback is fed to the
anode of diode CR210, charging the
0.47 -NF capacitor, C242. If the pulses
are within a safe operating limit, the
capacitor will not take enough charge
to allow the neon lamp to fire.
If the pulse voltage rises, indicating
more output from the flyback and more
high voltage, the charge on the capacitor
goes high enough to let the neon lamp
fire. The charge on the capacitor will
hold the neon on (firing continuously)
between flyback pulses. Once this lamp
TO
HORIZONTAL
OSC
0209
L MIT
5'VITCH
.0022
10K
2.2K
3AGB
.001
CR210
PULSE FROM
HORI. DNTAI.
SWE E
PLEASE OBSERVE
POLARITY WHEN
REPLACING NEON
BULB
R331
1.8MEG
=
FIG. 7 -LIMIT SW TCH IN 25DC57. with an
SCR instead of the 25CC55's transistor.
HIGH
HIGH
VOLTAGE
VOLTAGE
RECT
SUPPLY
3A3C
SHUNT
REGULATOR
6EN 4
HORIZ
OUTPUT
R104
HORIZ
DRIVE
PART OF
FLYBACK
R120
6ME6
R173
C R 104
+405
R165
PRIMARY
REDUNDANT
CR107
C127
T
R187
120V
-4--
C103
CR106
R185
R186
C R 103
FIG. 8 -THE REDUNDANT REGULATOR principle, found in RCA CTC 39 and CTC 50.
fires, it alters the base voltage of the
limit- switch transistor, which goes into
heavy conduction. With its emitter
grounded, the collector voltage drops
sharply when the transistor is in
saturation.
.0022
0209
LIMIT
SWITCH
24v TO
VIDEO
AND AGC
+125V
6.2K
CR214
3W
0212
+24v
10K
24V
REGULATOR
101i
3w
FROM
RECT
+24V
(REG)
NEON
3AGB
C242
.47
FIG.
6- ZENITH
CR210
18052,
PULSE FROM
HORIZ SWEEP
7w
+
T +500/75V
25CC55 HAS LIMIT switch transistor for high -voltage hold-down.
the limit- switch transistor actior turns
off the 24 -volt regulator transistor. It
stops conducting (becomes an open circuit). The collector of the limit- switch
transistor is the voltage source for the
video module, as well as the I.F. and
tuner AGC. In heavy conduction, this
voltage drop practically kills the picture,
due to the AGC action. The raster will
stay on, but no picture or sound.
In the later model 25DC57's, the reaction is the same; the transistor limit switch has been replaced by all SCR
(Fig. 7). Although the operation is the
same, now the limit- switch SCR's anode
feeds the horizontal oscillator. When it
fires, the voltage drop turns off the horizontal oscillator and the HV. Yc u lose
the raster, of course. The reaction and
symptoms of the SCR circuit is !.lightly
different. If it is fired by a rise in HV,
or accidentally fired by a line surge or
65
www.americanradiohistory.com
+280V
9-
REDUNDANT
FIG.
REDUNDANT HV REGULATOR in
screen -grid circuit, RCA CTC 51 and similar.
PRIMARY
+280V
R109
C409
+130V
N
CR402
31LZ6
IC
PART OF
FLYBACK
HORIZ
OUTPUT
NOTE: SOMETIMES
OPENED TO SET
PROPER HIGH
HOR IZ
DRIVE
VOLTAGE
arc, the TV will be turned off. To check
for this, turn the switch off and wait for
about 10 seconds. This allows the charge
on the capacitor to leak off. If the "trip"
was accidental, the receiver will come on
again as it should.
The neon lamp gives a good indication of what has happened. If it's lit,
this shows that the limit switch has been
tripped (in either circuit). Try turning
the power off and waiting the 10- second
period. If the set won't come on when
the switch is turned on, then you check
out the HV and horizontal sweep circuits, plus the regulator and limit switch.
The neon lamp is a very special polarized
type. Use only exact duplicates for replacements, and when you install it be
sure it's properly polarized!
Redundant regulators
In such sets as RCA's CTC39, CTC50,
and later ones, you'll find the redundant regulator system in use. This is the
"triple- threat" type I mentioned in the
beginning. Figure 8 shows the basic circuit. As you can see, it has a "stock"
shunt regulator (that's one) the diode in
its cathode (that's two) and a spare that
goes into action if the first two fail! The
primary regulator circuit is the same as
that explained before.
The redundant regulator is below the
dashed line. A pulse from the flyback
is fed through C141 and R185 to shunt
See that curved end handle? That little nifty stops
this plier from slipping through your hands when
you're tugging or twisting. No wasted gripping power
just to hold onto the handle, less hand fatigue.
See that jaw- opener coiled spring? It's a big help
on repetitive work.
See those cutting edges? They're hand honed,
perfectly mated, specially hardened to assureclean,
easy wire cutting time after time.
Get the CHANNELLOCK No. 350 -S Plier. It will
be one of the handiest tools in your kit.
Meadville, Pa. 16335
CHANNELLOCK, INC.
Send For Our Free Catalog
No. 350 -S Plier
Circle 18 on reader service card
www.americanradiohistory.com
diode CR103. This diode acts as a clamp
to hold the voltage to a certain negative
level. If the flyback pulse rises in amplitude, raising the HV output, the 120 volt Zener diode CR107 conducts. This
charges the filter circuit capacitor, C127.
The higher negative voltage is fed
through R165 to the 6ME6 control grid,
reducing the output.
The part numbers shown in Fig. 8 are
those used in the RCA schematic of the
CTC39. The CTC50 circuit is exactly the
same, but part numbers are different.
To check either circuit, read the DC
voltage on the junction of R165 and
CR107. In the CTC -39, this should be
-78 volts ± 10 volts. In the CTC50,
(the parts will be R106 and CR105), the
DC voltage will be -63 volts ± 7 volts.
If this voltage is out of limits, high,
look for trouble in the HV circuitry. If
it is too low, check the redundant -regulator circuitry.
Redundant screen regulator
The CTC51, 52, 53 and 55 RCA's use
a slightly different type of redundant
regulator, with a novel effect. Figure 9
shows the circuit. The operation of the
primary regulators is just the same,
though part numbers will differ. For this,
the pulse is fed to the VDR, RV402,
which develops a negative grid voltage
as before.
The redundant regulator is applied in
the screen grid circuit of the 31LZ6. The
clamp diode CR402 sets the screen grid
voltage at +130V. It also connects the
big filter capacitor of the +130-volt
source to the screen for bypassing. C409
looks like a screen bypass, but it is a
very small unit.
If the primary regulator circuit goes
out, letting the output rise, this causes
the horizontal output tube to draw more
screen -grid current. This drops the screen grid voltage. Diode CR402 turns off, being reverse- biased. The main effect of
this is to disconnect the filter capacitors
from the 31LZ6's screen grid circuit! An
unbypassed screen grid causes heavy degeneration, and reduces the gain of a
tube. (Like the old radios with an open
screen bypass!) So, the flyback drive is
reduced, and the HV held within safe
limits.
To check the operation of this type of
regulator, turn the set off. Temporarily
connect a 6,800 -ohm, 5 -watt resistor
from the 31LZ6 control grid to ground.
This is Point F on the PW-400 board.
Connect a DC voltmeter from the screen
grid to ground, and turn the set on.
Screen grid voltage must not read more
than +95 DC. If it's higher than that,
check the dropping resistor R109, 12,000
ohms 4- watts, to see if it has been burned
or dropped in value. (When you finish,
be sure to take the shunt resistor off the
Ex7c2
The most important thing, to me, is to
remember that they're there! In a lot of
cases, troubles in the redundant regulator
and similar circuits could cause an unwary technician to replace flybacks,
yokes, and so on, only to find that he
still had the same trouble he had when
he started. This is embarrassing (and
I'm not going to tell you how I get information like that!) Seriously, your best
source of data on the use of these circuits is the factory service meetings and
factory service literature. Check as much
of this as you can, and it'll go a long
way toward keeping you out of unnecessary trouble. This we can live without -we've got enough as it is!
R -E
COMPLETE
IONSTRIICTION
PLANS
III
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control grid!)
As you can see, there are several different types of these circuits. You will
see quite a few different reactions and
symptoms. You will probably run into
slightly different versions in other sets,
but if you remember the purpose of the
things, they won't be hard to diagnose
and repair.
.111
Recorder Actuator. Remote Control. Schematic.. Speakerp,w
Burglar Alarm. Voice Scrambler. Dial /Tone Converter. Tone /Do
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19 on 11'udcr serVICe ra,'
don't have to buy a new car to get an electronic ignition.
Most of you know the evaluation of automotive electrical systems
an evaluation characterized only c ccasionally by
efficiency and performance. know that, and t Tat's why use
the Delta Mark Ten B CDI on all my cars, ne,.: and old. And
believe me, you don't have to have a new ;,a to appreciate
the best electronic ignition available today. Slidy these features and you'll know what mean.
1. Mark Ten and Mark Ten B Capacitive D s: large Ignition
Systems are manufactured by Delta Products, Inc., a company
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in product and in customer relations.
2. The Mark Ten CDI's really do save money Dy eliminating
the need for 2 out of 3 tune -ups. Figure it out
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in your pocket. No bunk!
3. Because the Mark Ten CDI's keep
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MARK
4. With a Mark Ten, spark plugs stay
i
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fouling is
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virtually eliminated.
...
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I
Name
Address
City
State
DELTA PRODUCTS, INC.
P.O. Box 1147, Dept. RE, Grand Juncticn
colo. 81501
303- 242 -9000
Mark Ten B,
assembled
Mark Ten B, kit
564.95 ppd
$49.95 ppd
Standard Mark
assembled
Deltakit®
Circle 20 on reader service card
www.americanradiohistory.com
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$49.95 ppd
$34.95 ppd
INDUSTRIAL TEST EQUIPMENT
meter ranges from 0 -0.4 ohm up to 200
megohms, in three ranges. To save the
batteries, they are turned on only when
(continued f rom page 41)
with the press -to -read button, which has
a lock -on position.
Figure 17 shows the Simpson Model
229 Series 2 AC Leakage Current Tester.
It can read potential leakages that might
be dangerous to the user. This could be
a production -line tester or used in large
shops.
The Simpson Electric Co. has two
Insulation Testers; these are their Models
400 and 401. Both are powered by self contained batteries. The only difference
is in the test voltage range. The Model
400 tests up to 500 volts, and the Model
401 up to 1,000 volts. Each has ohm-
BARGAIN
BONANLA
LED's- IC's
0 (DCT7001)
$5.95
CLOCK
(DMM5314) CLOCK $4.95
6 digit, hold count, w /data.
(D8038) VOLT. CONT. OSC.
With data.
$4.95
(DLM309K) 5 volt lamp
REGULATOR
$1.35
(DUE
HIGHEST QUALITY
(0293) SEVEN
SEGMENT
LED's
$1.00
14 pin DIP guar.
(0102) CALCULATOR
$3.95
KEYBOARD
Wild Rover C -1380. Can be
used with CT5001. 4 function, clear, clear entry and
constant.
(D223) 10 ASST. LED's
guaranteed
$1.00
KITS
ONLY NEW
PRODUCTS
(0242) 3 LED's
Yellow
guar.
(D175) 70 1/2w CARBON
$1.00
RESISTORS
Asst. values. Some 5 %.
$1.00
enough
for soldering.
(0149) 20 POLYSTYRENE TOP
GRADE CAPACITORS
$1.00
Popular sizes.
0 (D001)
(specify)
5 RED LED's
guaranteed
$1.00
AMP
POWER TRANSISTOR
$1.49
7
Si NPN. Similar to
SK3054. 90v, 90w.
(0132) 20 DUAL
POTENTIOMETERS
Asst. ohmages.
$1.00
13 ELECTROLYTIC
CONDENSERS
$1.00
types, tubulars, some multiple sections.
(0138) 10 SLIDE
FP
SWITCHES
$1.00
All types: DPDT, SPST, etc.
(D134) 8 ROTARY
SWITCHES
Some multiple gang.
1=1(0125) 4 TRANS-
$1.00
FORMERS
$1.00
Some power, filament, output,
worth up to $10 each.
(0144) TRANSISTOR
REPAIR KIT
Various parts used to
3A3
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3BN6
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4BC5
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4CY5
4HA5
(D141)
6 RCA JACK
$1.19
repair
transistorized devices.
(D137) 10 INSTRUMENT
KNOBS
$1.00
Made by Ratheon, etc. With set
screws.
(0164) 4 ROLLS OF WIRE $1.00
Approx. 25 ft. per roll, 20 -28ga.
(D148) 4 ROCKER SWITCHES
Assorted.
$1.00
$1.00
RESISTORS
$1.00
All 1 %, 1/2w and 1w, low and
high ohmages.
(0128)
13 MINIATURE ELECTROLYTIC CAPACITORS $1.00
Axial & upright, popular values.
(0150) 15 HI -FI KNOBS $1.00
Every
from
etc.
one superb! Purchased
Harmon Kardon, Fisher,
(0156) 60 DISC
CAPACITORS
$1.00
Asst. from .0001 to .1, most
600v, Z5U, NPO, N750, etc.
(D147) 4 Ib. GRAB BAG
SPECIAL
$1.00
Full of exotic and exciting elec-
tronics parts.
(0155) TUBE BONANZA! $1.00
20 asst. popular tubes, untested.
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Terms: Minimum order $4.00. Include postage. Either full payment
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(D140) TAPE RECORDER
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over
$2.95
Parts for repairing most tape
recorders: capacitors, meter,
pilot lamp, jacks, and MUCH
STRIPS
(0142) 50 PRECISION
6EM7
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6GN8
6DE4
6DR7
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5Y3
$1.19
for -,
DIODES
6AQ5
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6AT6
6AU6
6AV6
6AV11
6AX4
6AX5
6AY3
6AY11
6BA6
6BG6
5V6
1w, 3 -30v, under 1v
ward characteristic.
From 2 -6 per strip.
(0253)
(0131)
or green
wl
the button on the probe is pushed. The
probe also has a light built into the tip,
so that you can see the point you're
checking!
Acquired from U.S. Defense depots
or removed from equipment (new
and used). These are laboratory
tested and guaranteed for one full
year. Most are of such standard
makers as RCA, GE, etc.
(DLSS32) 10 ZENER
(D154) 150 CUT LEAD
RESISTORS
Carbon, all leads long
SURPLUS TUBES
All guaranteed for
1 full year.
ANY 3 FOR $1.25
Alarm & date. With data.
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17
16
unique tools,
handy kits,
MORE.
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(0167) 10 MINIATURE
precision
instruments,
technical
POTENTIOMETERS
$1.00
For transistor applications.
(0145) 50 TIE LUGS
2000
$1.00
From 2 lugs up.
supplies.
(D182) 2 TUNING
METERS
$1.00
Misc., miniature.
(D222) 20 DIODES
lA 50PIV. Epoxy, guar.
(D126) 10 HUM BALANCERS
Asst. values.
$1.00
(0575) BATTERY CLIPS $ .15
For stand. 9v battery.
(D1094) DISPENSER PACK
SOLDER
$ .59
60/40 Rosin Core, .04" x 110".
(D174) 20 SCREW
TERMINAL BOARDS
$1.00
Speaker type, from 2 -8 term.
(D136) 50 RADIO KNOBS $1.00
Asst. shapes, sizes, colors.
(D181) 8 NE2 NEON
LAMPS
With pigtail leads.
$1.00
(D377) SMALL
PHONO ARM
$.99
Complete with cartridge. Used
in many children's phonos.
(3005) 50 FEET SHIELDED
CABLE
$1.00
(D006) SHIELDED WIRE
KIT
$1.00
10 pcs. of heavy gauge 28"
cable.
ERIE ELECTRONICS, INC., 2700 -D HEMPSTEAD TPKE., LEVITTOWN, N.Y. 11756
Circle 21 on reader service card
www.americanradiohistory.com
Our 23rd year of service to the World's
finest craftsmen and technicians.
A carefully selected and tested assortment
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Figure 19 shows an interesting instrument. It is the Simpson Model 410
Photo -Tachometer. No physical contact
with rotating machinery is needed. A
white (or black) mark is placed 6n the
flywheel, gear, or whatever is to be
Now. . .the most enjoyable
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Join the thousands of Schober Orgar builderowners who live in every state of th a Union.
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how to turn the hundreds of quality parts into
one of the world's most beautiful, most musical
organs, worth up to twice the cost of the kit.
-
-
-
-
checked. The probe is held near the
moving object; it can operate up to 12
inches away under the right conditions.
It has a built in light and a photo- detector. Speed is read out directly on the
multi -range meter.
Figure 20 shows the Simpson Model
886 Sound Level Meter, in its carrying
case with all of the accessories needed.
The round thing at the left is a calibra-
The ..92CAC et Organ Corp., Dept. RE-140
43 West 61st Street, New York, N.Y. 10x3
Please send me Schober Organ Cate log.
Enclosed please find $1.00 for 12 -inci L P.
record of Schober Organ music.
NAME
ADDRESS
CITY
71P
STATF
Circle 22 on read r service card
GET YOUR
ALL NEW, BIG
Tv
1975
tq Por T.tl.oa
TV TECH AID
ó
tor. This is held over the end of the
Sound -Level meter, and provides a calibrated sound- source for accurate measurements. This kind of thing is often
COLOR TV BOOK
Brand new, all -in -one book. Over 500 trouble shooting tech -tips.
Covers all leading manufacturers, Admiral, Emerson, GE,
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Saves you time and money.
"%._. _._.__.....
rIW
Mt KM
BACK
PLEASE SEND:
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GET 'EM WHILE THEY
SPECIAL REDUCED
1970
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1971
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1975
21
needed to make checks required by
OSHA for ambient noise-levels in plants,
etc. (Rock bands not included. After all,
it only goes to 140 dB!) Note the special
"OSHA" calibration on the dial.
(to page 86)
MAIL CHECK OR
MONEY ORDER TO:
TV TECH AID
P.O. Box 603
Kings Park, N.Y. 11754
ES12
1971
12 Issues $3.00
1973
1972
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1974
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Issues
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Name
Address
City
State
Circle 23 on reader service card
www.americanradiohistory.com
Zip
69
new products
More information on new products is available from the
manufacturers of items identified by a Reader Service number. Use the Reader Service Card inside the back cover.
346
wn0
Save
DIGITAL MULTIMETER, model 21 measures
capacitance, AC volts, DC volts and resistance. Palm -sized unit has 4 DC ranges with
1 -mV resolution; 4 AC ranges with 1 -mV res-
Instruments,
Burglar Alarms,
Automotive &
Hobby
point. Cut -off slopes are 6 dB /octave, 12
dB /octave or 18 dB /octave. Less than 0.3%
harmonic distortion; signal -to -noise ratio
greater than 85 dB. Power requirements are
Electronics!
The more you know about
electronics, the more you'll
appreciate EICO. We have a wide
range of products for you to
choose from, each designed to
provide you with the most
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"Build -it- Yourself" and save
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-
120 V, 50 -60 Hz, 5 watts. 133/4 X 51/2 X 13 in.;
12 lbs. 6 oz.; $199.95.
U.S. Pioneer Electronics Corp., 75 Oxford Drive, Moonachie,
NJ 07074.
Circle 33 on reader service card
olution; 4 resistance ranges with 1 -ohm
resolution and 4 capacitance ranges with
1 -pF
resolution. 31/2 -digit 0.027 -inch LED
readout (up to 2000 counts); simplified five step calibration. Powered by 4 rechargeable
NiCad batteries. $269.00 with battery charger
and belt carrying case. -Data Technology
Corp., 2700 South Fairview, Santa Ana, CA.
Circle 31 on reader service card
EICO -283 Malta Street,
Brooklyn, N.Y. 11207
Leadership irr creative electronics
since 1945.
rE/COI
PA AMPLIFIERS, CHS -A Series. Four amplifiers incorporate an electronic compressor
and have facilities for connecting reverbera-
tion unit or acoustic equalizer unit.
Model CHS -20A is rated at 20 watts and
comes equipped with one high- or low impedance unbalanced microphone input
and two high- impedance high-level auxiliary
TRIODE, model DX -475. Water -cooled triode is used in industrial RF generators.
Metal ceramic envelope construction permits high processing temperatures that
yield better outgassing and higher maximum seal temperatures. Helical water cool-
For latest EICO Catalog on Test
Instruments, Automotive and Hobby
Electronics, Eicocraft Project kits,
Burglar -Fire Alarm Systems and name
of nearest EICO Distributor, check reader
service card or send 50¢ for fast first
class mail service.
unit provides ten different crossover points
for low- and mid- and high- frequency driver
elements with each range level adjustable
to meet the needs of speaker elements and
listening room.
Crossover frequencies: 125 Hz, 250 Hz,
500 Hz, 700 Hz, 1 kHz, 2 kHz, 4 kHz, 6 kHz,
8 kHz. Variable slope for each crossover
ing coil is
anode. The
integral part of the tube
a safety factor in grid dissipation.
Other features include an integral grid
connector, anode mounting and flexible filament leads for elimination of accessory
hardware and ease of installation. Unit is
rated at 20 kW input and 10 kW plate dissipation.
Amperes Electronic Corp., 230
Duffy Avenue, Hicksville, NY 11802.
Circle 32 on reader service card
an
"K" grid provides
-
ELECTRONIC CROSSOVER NETWORK,
model SF -850. For use in bi -amp or tri -amp
high -fidelity component systems. Solid -state
Circle 24 on reader service card
www.americanradiohistory.com
inputs. Each input has a separate volume
control plus master volume and tone controls, compression switch, power switch and
pilot light. Models CHS -35A, CHS -60A and
CHS -100A are all similar except for their
power ratings which are 35, 60 and 100 watts,
respectively. They have two high or low impedance unbalanced microphone inputs and
two high- impedance high-level auxiliary inputs, each with volume control, plus master
volume and tone controls, compression
switch, power switch and pilot light.
Lear
Siegler Inc., Bogen Div., P.O. Box 500,
Paramus, NJ 07652.
Circle 34 on reader service card
-
QUICK -OP, model 200 -741. Just plug in
components. Solderless connectors
on
breadboard accept wire sizes from .010 -in.
to .032 -in. Panel is keyed to operational
amplifier action that enables circuits to be
set up with component leads alone. Patch
leads are rarely required when typical
leaded devices such as 1/4 -watt resistors,
diodes, capacitors, etc. are used. Circuit
may be quickly verified; there is no clutter of rarely used or unidentified tie points.
tools for specific problem -solving areas.
Heavy duty attache case measures 19 X
14 X 6 in. Pallets have pockets of heavy
duty, see thru -vinyl. Top section has pocket
for technical manuals and bottom section
has compartments for test meters and other
gear. -Vaco Products Co., 510 North Dearborn Street, Chicago, IL 60610.
Circle 37 on reader service card
ALARM CLOCK RADIO KIT, model GR -1075.
AM /FM digital electronic alarm clock radio
kit reads out the time in bright orange
digits that dim automatically in darkened
rooms. A 24 -hour alarm cycle feature allows you to go to bed at 9:00 and set the
alarm for 10:00 without being awakened in
an hour. Alarm can be set to go off with
THE
CURVE TRACER
THAT W011T
COLLECT DUSt
76,40\1
Internal operational amplifiers are mounted for easy replacement and wired for low
capacitance and leakage paths. Houses
two standard 9 -volt transistor batteries.
in.; 41/2 oz. less batteries;
27/8 X4X 178
$24.95 (initial offer). -Hildreth Engineering
Co., P.O. Box 3, Sunnyvale, CA 94088.
Circle 35 on reader service card
COMPONENT KITS, Interkits offer quality
electrolytic, tantalum, metalized polyester
film and subminiature polyester film capacitors, carbon composition resistors, plus
rectifier, Zener and switching diodes. Only
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with music from an AM or FM radio station. A 7- minute snooze cycle is repeatable
for up to one hour. Another feature is an
internal standby battery supply that takes
over in the event of a power failure (batteries not supplied).
Solid -state circuitry- entire unit (including clock) contains four IC's, 41 transistors
and 35 diodes. $129.95. -Heath Co., Benton
Harbor, MI 49022.
Circle 100 on reader service card
a
(continued on page 76)
rG
i
k'
values provided permits design engineers,
servicemen or hobbyists to fulfill virtually
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Choose from 12 design engineer kits
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International Components
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Circle 36 on reader service card
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SUPER CASE,
$345.
Name
Address
City /State /Zip
H am a veteran or serviceman
on active duty.
HICKC 1K
MT/
the value innovator
formerly
MOTOROLA TRAINING
INSTITUTE
INSTRUMENTATION Si. CONTRO_.O DIVISION
THE HICKOK ELECTRICAL INSTRLI .LENT CO.
College Hill, Summerdale. Pennsylvania 17093
e
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Circle 26 on reader service card
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testing, evaluating, classir ling
and matching all types arf
transistors, FET's and clou es.
You'll get stable, full rartgrl
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The Model 440 is the mos
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$16500
I
hollow shaft nut drivers, four screw holding drivers, four testers, two crimping and
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The Hickok Model 440
semiconductor curve trac ,r is
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IN- CIRCUIT TRANSISTOR TESTER
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As an NTS student you'll acquire the know -how that
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Compare our training; compare our lower tuition.
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be equipped.
HIGH FIDELITY
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NEW PRODUCTS
(continued from page 71)
DIGITAL
PERFORMANCE
LOGIC MONITOR. Compact, self -powered,
self- contained, pocket -size unit requires
no calibrations or adjustments as it simultaneously displays static and dynamic logic
Mliïfr I
1141
The Hickok Model 334 DMM is
a rugged, non -temperamental,
hardworking tool that's easy to
use and easy on your eyes.
Hickok has established a unique
reputation in digital electronics
during the past 10 years. The
Model 334 is another example
of our engineering expertise
an economical lab quality
instrument with exceptional
durability and accuracy.
Easy reading, green
fluorescent display
31/2 digit
auto polarity
26 ranges including 200 mV
AC & DC ranges
Fast response
2.5 readings /sec
states of DTL, TTL, HTL or CMOS DIP IC's.
Used for troubleshooting and signal tracing. High intensity LED's turn on when lead
-
Basic Accuracies (% of reading)
DC Volts; ±0.2% ( ±0.5% on 200V,
1200V ranges)
AC Volts; ±0.5% ( ±2.0% on
200 mV, 2V ranges)
OHMS; ±0.5%
DC Current; ±1.5%
AC Current; -±2.0%
Ask to see the Model 334 at your
Hickok distributor. It's a no
compromise DMM at
you can afford.
a
price
HICKOK
the value innovator
INSTRUMENTATION & CONTROLS DIVISION
THE HICKOK ELECTRICAL INSTRUMENT CO.
10514 Dupont Avenue Cleveland, Ohio 44108
TWX: 810- 421 -8286
(216) 541 -8060
Circle 28 on reader service card
brated 8 X 10 cm display, internal graticule
to eliminate parallax error, DC coupling, triggered sweep and pushbutton beam -finder.
Deflection factor is adjustable from sensitive 2 mV /cm to 10 V /cm. Built -in TV sync
separation asures stable automatic triggering on frame or line for convenient TV
troubleshooting. Calibrated sweep accuracy
is within 4 %. $895.00 -Hewlett- Packard Co.,
1501 Page Mill Road, Palo Alto, CA 94304.
Circle 39 on reader service card
single family dwellings.
Dual- function unit consists of control unit
that houses a radio receiver and a loud
klaxon alarm; exits and entrances are protected by transmitter/magnetic sensor com-
CUT
Sib
12 REASONS YOUR CAR
NEEDS TIGER CDI
Instant starting in any weather - Eliminates
tune -ups - Increases gas mileage - Increases
horsepower 15% - Improves acceleration
and performance
Spark plugs last up to
70,000 miles - Reduces engine maintenance
expense - Amplifies spark plug voltage
to 45,000 volts
Maintains spark plug
voltage to 10,000 RPM - Reduces exhaust
emissions
Dual ignition switch - An
Unconditional LIFETIME GUARANTEE
Installs in 10 minutes on any car with
12 volt negative ground - No rewiring - Most
powerful, efficient and reliable Solid State
Ignition made.
-
-
SATISFACTION GUARANTEED or money
back
$22900
Circle 38 on reader service card
ALARM SYSTEM, model 511 Alert. Wireless,
solid- state, residential alarm system for doit- yourself installation in apartments or
IiWitiitlilltli
-
-
06509.
OSCILLOSCOPE, model 1222A. 15 -MHz dual channel scope has built -in delay line to make
visible the leading edge of traces. Gives option of viewing Channel -A with Channel -B
either added or subtracted (A ±B modes).
Identical dual -channels provide calibrated
X -Y displays. Has 3% vertical accuracy, cali-
YOU CAN
RELY ON.
voltages exceed the 2-volt threshold. No
power supply is needed as power seeking
gate network locates DIP supply leads and
feeds them into the unit. 4X2X1.5 in.;
$84.95.- Continental Specialties Corp., 44
Kendall Street, Box 1942, New Haven, CT
TIGER 500 assembled
TIGER SST assembled
$53.95
$42.95
Post Paid in U.S.A.
Send check or money order with order to:
IV-Star Corporation
P.O. Box 1727
B
Grand Junction, Colorado 81501
DEALER INQUIRIES INVITED
Circle 29 on reader service card
www.americanradiohistory.com
binations; personal protecton is provided by
portable "panic- button" transmitters. Unit
incorporates FSK coding technique that
makes it virtually immune to radio frequency
interference. With FSK, many radio frequency channels are available.
Linear
Corp., 347 South Glasgow Avenue, Inglewood, CA 90301.
Circle 40 on reader service card
-
HEAT TOOL, Heat Pen is pneumatic flame less heat tool. Uses less than 300 watts of
electricity and less than 1.5 cfm of pressurized air. Built to meet OSHA standards, no
dangerous hot areas and has no motor or
fan to wear out. Long -life interchangeable
plug -in heating elements allow versatlity by
providing a range of heat from 150° to 800°
F. Elements may be changed without use of
tools within ten seconds.
Comes complete with 400 ° -600 °F element, control unit with power and safety
switches, baffle adapter and grounded cord
7
A FLICK
OF THE SWITCIF
your new 1930-1950 book
out of
2 Who
1
haare it
dank
A FLICK OF THE SWITCH is your time trip through the ga lden days of radio broadcasting and into the dawn of televisio Revisit "cathedral" radios, old Ham days and many more. Dis
cover the rewards of collecting. Over 1,000 pictures make this
know
it...
book the 1930-1950 collector's reference. Order your copy u4
this 260 -page book now! $9.95 hard -cover, $6.95 handlhoo e,
Other valuable books are Vintage Radio (1887-1929) $7.E 5
hard -cover, $5.95 handbook; Radio Collector's Guide (19211932) $4.95; 1927 Radio Encyclopedia $12.95 hard-cover, $9.E 5
soft- cover; 1926 -1938 Radio Diagrams $7.00. Also, we'll fuenish any pre -1951 diagram for $3.50.
5 oz.; $79.50. Accessories include a
complete line of baffles, remote foot switch,
air regulators and fittings.
Instruments
America, Inc., 823 N.W. 57th Street, Ft.
Lauderdale, FL 33309.
set.
-
Circle
41 on
reader service card
MODULATORS add CCTV programs into
master TV antenna systems or CATV systems. Designed to provide optimum performance, free of adjacent channel problems, beat and other problems associated
with mixing into a system. Accept composite -video and /or audio signals. Video
signals may be obtained on TV camera,
video tape recorder, film chain or TV
demodulator in either color or monochrome.
Audio signals are derived from AM or FM
tuner, tape recorder or high impedance
dynamic microphone. Broadcast quality of
signals occupy any one VHF TV channel
from 2 to 13. May also be used as carrier-
substitution generators.
Send today to Vintage Radio, Dep't R, Box 2045, Palos Verde:
Peninsula, CA., 90274. Postage paid. Cal. residents add 6% tax
million Americans have high
blood pressure. But 50 percent of
those who have it, don't know it.
When blood pressure goes higher
than it should, and stays high, it sets
the stage for heart attack or stroke.
21
Most cases of high blood pressure
can be controlled with drugs and
other advances in treatment. That's
why you should see your doctor regularly. Only he can tell if you need
help.
$
lift ,
TOTAL
Name
Address
City
A
public
urMn
You'll never
know
how much
good you
can do until
you do it.
NSTRUMENTS
of
i
You can help
-
Circle 42 on reader service card
Radio Age Guide with each order FREE
mosupo from your
Hurt 4yaotallon
people.
Model AVTM 4923, provides both modulated visual and modulated aural RF carrier output on any single VHF TV channel;
can be used to put both video and audio
on unused channel of MATV system or onto
single TV receiver. Model VMT 4922 provides only modulated visual RF carrier output on any single VHF channel; can be
used to put video on un -used channel of
MATV system or onto a single TV receiver.
Model VM 4925 is similar to VMT 4922
with additional capability of modulating
video bandwidth of up to 8 MHz wide for
high resolution CCTV or modulating combined 4.5 MHz aural and video signal from
a microwave down converter output. Model
AMT 4921 provides only aural RF carrier
output on single VHF TV channel; can be
used to put audio on unused channel of
MATV system or into single receiver.
Blonder-Tongue Laboratories, Inc., One
Jake Brown Road, Old Bridge, NJ 08857.
Zip
St
FREE
In tact, there's a
crying need for your
Your talents. Your
training. Your concerns. They make you
valuable to your
business. They can
make you priceless to
your community.
If you can spare
even a few hours a
week, call the
Voluntary Action
Center in your town
Or write: "Volunteer,
Washington, D.C.
20013.
It'll do you good
to see how much
good you can do.
Volunteer.
The National Center
tor Voluntary Action
4 Fud,c
sente d
This
',W.,ne
3TMAdverl,YrqCourcli
(ñ n,
i,
IN O
Out
Circuit
Transistor Analyzer
Dynamic In Circuit
Transistor S. Radio Tes
Signal Generator
Signal Tracer Voltme
Milliammeter
Battery Tester
Diode Checker
Transistor Analyzer
!12
Msle1
Factory Wired & Tested -$26.95
Easy -to- Assemble Kit -$17.95
RAtlO'6 All the
YOU DON'T NEED A BENCH FULL OF EQUIPMENT TO TEST TRANSISTOR
facilities you need to check the transistors themselves and the radios or :ther cirthe compact,
into
have been ingeniously engineered
cuits in which they are used
6 -arch high case of the Model 212. It's the transistor radio troubleshooter with all the
features found only in more expensive units. Find defective transistors al l circuit
troubles speedily with a single, streamlined instrument instead of an elaborate
--
hock -up.
Features:
high or low
Checks all transistor types
power. Checks DC current gain (beta) to
20C in 3 ranges. Checks leakage. Universal test socket accepts different base
configurations. Identifies unknown transistors as NPN or PNP.
Dynamic test for all transistors as signal
amplifiers (oscillator check), in or out of
circuit. Develops test signal for AF, IF,
or RF circuits. Signal traces all circuits.
Checks condition of diodes. Measures
battery or other transistor -circuit power supply voltages on 12 -volt scale. No external power source needed. Measures
circuit drain or other DC currents to 80
milliamperes. Supplied with three external leads for in- circuit testing and a
pail' of test leads for measuring voltage
ano current. Comes complete with
Instruction manual and transistor listing.
-
I
- --
EMC, 625 Broadway, New Yolk 1::, N. Y.
Send me FREE catalog of the petiolate
value -packed EMC line, and name of
local distributor.
NAME
RE-7
ADDRESS
CITY
ELECTRONIC MEASUREME
625 Broadway, New York,
'E__
)RP
1001?
77
www.americanradiohistory.com
You can tear out
alithecards
in this magazine...
Butthisistheone
you should mail!
If you're thinking of investing your money
in a learn-at -home program in electronics, there are
a few things you should know first.
Selecting a home electronics program
isn't easy. It could be one of the most
important decisions you'll ever make for
your future. So you want to decide carefully and get the best education you can.
After all, you're investing your time
and money, and you want a full return on
that investment.
What should you look
for before you select a school?
You probably want a school with a
proven track record of quality and per formance.You want personal attention
plus, the convenience of learning at home.
You want the most up- to-date technical
texts... teaching aids and learning
methods.
But most of all you want to actually
learn what electronics is all about. Not
just theory, but actual hands-on experience with the latest and best technical
equipment available today!
At Bell & Howell Schools, you get
all that ...and so much more!
Bell & Howell Schools has been in the
home -study electronics business a long
time. Almost half a century. In that time,
we have developed teaching techniques
that provide our students with the most
vital and comprehensive learning system
available for at -home study.
Techniques like our "step -by-step"
concept of learning.
At Bell & Howell Schools, we start you
off with the basics.Then take you step by
step through the learning process. You
work at a comfortable pace -not too
fast... not too slow. If you already have
some learning or experience, we'll arrange
advanced standing in the program so you
can skip the beginning lessons. And don't
worry if you don't have any electronics
background. 25% of our graduates never
www.americanradiohistory.com
even had any electronics training before
enrolling with Bell & Howell Schools.
(Based on a recent survey of our graduates
conducted by an independent research
firm. Survey results available on request.)
Or our system of personal contact.
No course is without its problems. And
when you get hung up on a problem, you
want answers and you want them fast.
Here at Bell & Howell Schools, we combine the convenience and pleasure of
learning at home with a system of personal contact with faculty and other
students that rivals -if not beats -any
other program available.
For problems that "just can't wait" we
have a toll -free "hot- line" that you can
call and discuss your questions with an
experienced instructor. You get real
attention- someone whose only job is to
see to it that your individual questions
are answered. And answered quickly
and clearly!
To help you develop your thoughts
and understand electronics principles
more thoroughly, Bell & Howell Schools
has developed a unique feature that no
other learn-at-home program has -InPerson Help Sessions in 50 major cities
throughout the United States. These let
you get together with instructors and
other fellow students. There you can talk
shop with other people who share your
interests...explore your problems further
...and get additional assistance.
But that's not all that Bell & Howell
Schools will do for you! In addition to
our vast experience and expertise, is a
philosophy that the best learning comes
from working with the best equipment
available. And that's exactly what our
students do!
So in addition to the exclusive "Elea ro
Lab ®" system that you will build as F art of
Bell & Howell's Home Entertainmen Electronics program, you'll also build a 2."
And what better way to find out how
diagonal color TV with digital features.
things fit together...how they work and
Sounds exciting, doesn't it? Well,
why they work than to actually build the
digital electronics is exciting! Its growth
equipment? And we don't mean gadgets
and application are giving us new an I
that will be worthless to you later.
better products and a whole new realm of
We mean equipment like the Bell &
split -second accuracy that was just a
Howell Schools exclusive "Electro- Lab ®"
dream a few years ago. And this neu
electronic training system including
technology is being applied more an 1
design console, digital multimeter and
more to TV's, clocks, radios and other
oscilloscope, that you can use profeshome entertainment equipment.
sionally after you've graduated.
By studying with Bell & Howell Sc hools
The design console will allow you to set -one of the first schools to introdur e
up and examine circuits without having
digital electronics as part of its training
to solder them in place.
program -you can actually get in on the
The digital multimeter measures voltground floor of this new technology
age, current and resistance and displays
while learning all the basic electroni :s
its findings in big clear numbers for easier principles and skills you'll need to detect
reading.
and troubleshoot problems professionally
And the solid-state "triggered sweep" on digital and other electronic equip) vent.
oscilloscope is similar in principle to the
Make no mistake about it! As you
kind used in hospital operating rooms to
build your digital color TV, you'll get a
monitor heartbeats. But you'll use it to
thorough grounding in electronics pm mmonitor and analyze tiny integrated
ciples. You'll develop a working kno'Wcircuits. And you'll find the "triggered
edge of "state of the art" integrated
sweep" feature locks in signals for easier
circuitry and the 100% solid -state chassis.
observation.
Plus you'll actually know how to prc;;ram
a special automatic channel selector to
That's not all you build when
skip over "dead" channels and how o
you choose a course from
build a remarkable on- the -screen dil ° tal
What better way to learn
electronics than to actually work
with electronics equipment?
.
i
Bell & Howell Schools!
To learn the most advanced electronics
technology, you have to work with the
most advanced
training tools.
clock that flashes the time in hours,
minutes and seconds.
But most importantly, you'll )rave'
the skills that could lead you to a
brighter future...
And isn't that what education is supposed
to be all about? At Bell & Howell Schools
we've always thought so although nc school
can guarantee you a job or income opportunity. Get full details about us, our courses,
our philosophy of education by mai ing the
postage -paid card today. If you take one of
our courses for vocational purposes. this
program is approved by the state açproval
agency for Veterans' Benefits.
Mail card today for full details!
If card has been removed,
write:
An Electronics Home Study School
D VRY IfSTITUTE OF TECHnOTOGY
ONE of ME
BELL
763'0
11
HOWELL SCHOOLS
EN
4141 Belmont, Chicago, Illinois 60641
"Electro -Labs" is a registered trademark of the Bell & Howell Company.
Simulated TV test pattern.
81
www.americanradiohistory.com
... here Today!
"IGNITION OF THE FUTURE"
ALLISON
"OPTO- ELECTRIC"
*
The BEST...the ULTIMATE...
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The Allison OPTO- ELECTRIC System eliminates the Points
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As there are NO moving parts in rubbing contact...Timing
adjustments are PERMANENT
The only "TRUE" Electronic
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Gives 40 -Times more Timing Accuracy than ANY system
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HIGHEST Performance at both Low and High speeds.
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strength does not fall off at high RPM. POSITIVE SPARK
helps eliminate "Misfire" for faster acceleration and improved
Engine Performance!
Smoother running (No timing fluctuation
as with Magnetic Units).
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Sparkplugs LAST 3 to 10 -Times LONGER.
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"INFINITE LIFE "...Once installed...Never needs replacing.
PERFECT TIMING INCREASES Engine Efficiency and Gas
Mileage. SAVES Precious Fuel! Allison gives you MAXIMUM
Engine Efficiency 100% of the time...and that's the name of
the game for BETTER Gas Mileage and Economy
*
SCOPES
(continued from page 59)
OP -AMPS
nais with reasonable fidelity, the bandwidth of this amplifier is generally not
great. Bandwidths in the order of 1 to 3MHz are quite common. Normally this is
no serious limitation, as most external
horizontal signals are of the sweep nature
themselves.
One should also remember that when
specifying a limit of horizontal bandwidth such as -3 -dB at 3 -MHz, the
manufacturer is also specifying a phase
shift. In certain measurements (especially
phase measurement), phase shift in the
horizontal amplifier relative to that in
the vertical amplifier can cause measurement errors.
The input impedance of a horizontal
amplifier may vary from oscilloscope to
oscilloscope. However, most oscilloscopes
are specified with either 100K or 1 megohm with some shunt capacitance. On
more elaborate oscilloscopes, the horizontal sensitivity specification may also
include specifications for a horizontal
attenuator and a variable gain control.
The most limited of oscilloscopes has
only a fixed amplitude specified for
horizontal sensitivity. External horizontal
input connectors will normally be the
same as those of the vertical input. However, the 5 -way binding post is occasionally used when the vertical input connector is of the BNC type.
R -E
get a linear rectifier that crosses over
essentially at zero. You can add a second
stage to invert one side to make this into
a full -wave rectifier.
There are, of course, many more things
we can do with low-cost operational amplifiers, particularly the 741, its improved
offspring, and the LM318. The only trick
(continued from page 44)
OUTPUTS
(HIGH IMPEDANCE)
FIG. 17- PRECISION RECTIFIER eliminates
diode offset and non -linearity.
to be sure you obey the simple use rules
associated with them. Remember, always
use feedback (usually to
Always
provide a source for input base current
bias on both the + and
inputs. And
never try to run at an operating frequency
unless you have at least ten times the open
loop gain your circuit calls for.
R -E
is
-).
-
MINI-BAR®
color generator
For
faster
service
PROVEN RELIABILITY!
Dyno Tested up to 15,000 RPM.
Road and Race Proven.
iOpto- Electric Systems won at
INDY Two years in a row!)
*
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BG-10 battery- operated, fits in shirt pocket!
No AC plug in
automatic on & off with LED indicator .
fast, easy hook -up with coaxial cable
all
essential patterns ...
Low power consumption for extended battery life (Uses inexpensive 9 volt batteries)
Shuts off when not in use
Enclosed RF
cable compartment
Size: 5 1/2" x 3" x
1/8 ". Only
12 ounces
TV station type sync signals
CMOS LSI
IC for all counting functions
.
no internal adjustments
RF output on Ch. 3, 4 or 5.
BG -10 (less battery)
$89.50
CC -1 Carrying Pouch
$ 2.95
$4995
COMPLETE.
you're not taking any
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State Make. Year, Engine Size. (Calif. Res. add Tax).
(So New...it's Sold ONLY FROM FACTORY DIRECT).
As you can see,
You may use your MASTER CHARGE or BANKAMERICARD.
Send us III Your Number, (2) Interbank No., (3) Exp. Date.
...
CODE
.
on
1
Before buying any other Type ignition system...
Send Postcard for our FREE BROCHURE.
*
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ALLISON
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all
mail
I
i
See
your distributor or write
LECTROTECH, INC.
5810 N. Western Ave..
Chicago, Illinois 60659
(312) 769 -6262
1269- L, East EDNA PL., COVINA, CAL. 91722
Circle 6/ on reader service card
Circle 30 on reader service card
www.americanradiohistory.com
MONEY SAVING BUYS
FREE $1
FREE GIFT WITH EVERY ORDER
CANADIANS: Ordering is easy -we do the paperwork
BUY WITH EVERY 10 YOU ORDER
Only applies to "$1 ' Buys
-try a small
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standard for all 110°
TV's (Blk. & Wht.).
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BRAND NEW SOLD AS IS
7
L7
AMPLIFIER CHASSIS
-
J
_
2'/"
Sq. Panel
TACHOMETER
Meter 1 -VDC, full scale 33 Ohm
I-
200
coil resistance 0 -6000 R.P.M.
CASSETTE type dynamic Mike 999
with universal plugs -200 Ohms
VU I"
-
129
PANEL METER
db Scale _______
0 -20
GREY SPEAKER WIRE
2 Cond. mini zip. 101 uses
CORDLESS SOLDER
IRON Complete with Auto
100'
WAHL-
Charger -Fast Heating-Cont nai
F-1
-Audio
Output TRANSFORM
Sub -min for Trans Radios
Coil TRANSFORMERS
456 -kc for Transistor Radios
5
5-I.F.
MERCURY COMPACT TUBE
TESTER Model #990 Miniature 4995
sized Specs Saver Full sized
-
I-1
KLEPS "CLEVER" TEST PRODS
"Third- hand" test prods, reach into
out of way places - Insulated _ cannot
slip - accommodates bare wire or
banana plug-no soldering.
PRUF 101_1 Versatile Test Probe
-8
SPK.
S
2 95
d
WAY SELECTOR 100
SWITCH Wall Mount
______
POWER
STANCOR
TRANSFORMER
329
117V -50-60 Cycle -Pri.
Sec. 12.6 Cent. Tap 2 Amp.
POWER TRANSFORMER
I l'Y- 48) -110V Pri. -12V Sec.
Used in many transistor
Power supplYs
COMPLETE CONVERGENCE
ASSY. -Inr. Yoke, Board &
Plug Conn. Adaptable
to most 90° sets
DELAY LINE -Used
COLOR
in most color sets
ASSORTED VOLUME
CONTROLS with switch
-.__
10- ASSORTED VOLUME
1_1 CONTROLS less switch
ROTARY SWITCHES
Li All nonalar tvne ° -$20 value
DELUXE PILLOW SPEAKERS
plug & volume control
7-
in
229
79
KLEPS
59
FLEXIBLE -PC
Board Terminals 6I/á' long
KLEPS I- ECONOMY
ni 4
1
100
A
100
1
100
2
TV
-$7 100'CO -AX CABLE
TWIN LEAD -IN
VARCO
With mounting
100
1
149
279
100
L
$1.50, 50'
(Black)
69
250' -$10, 100'- $4.50, 50'
DIODE -MOST
POPULAR TYPES Common
250
cathode or Series connected
CONVERGENCE RECTIFIER
For COLOR TV 4 Cell
100
Used in RCA -Philco, etc.
TV DAMPER DIODE SingleLi Replace RCA part #120818
$2.29
Dual-RCA part #135932
$3.95
COLOR POWER TRANS,
-Good for most sets 26R150
695
U
List Price- $36.75
6-Top Brand Silicon RECT.
100
300 ohm 500'
RG59U
5-DUAL
-
-
amp., 1000 PIV
TRANSISTOR
Li general purpose, TO -5 case ...- .._._..
5-NPN TRANSISTORS
general purpose, TO -5 case
ASSORTED TRANSISTORS
big factory scoop -sold as -is ..____.
5-9 VOLT MOTORS
Excellent for hobbyist
2- ELECTROLYTIC CONDENSERS Axial leads-500-25V
ELECTROLYTIC CONDENSER
1
25-
mfd.-200V
2-ERSELECTROLYTIC
CONDENS80/100/60 MFD -160V
2ELECTROLYTIC
200/30/4 -mfd -350V
100
100
1 00
100
100
COND
3- ELECTROLYTIC COND
100 mfd. -IOOV. 50 mfd.-75V
-0
100
1
1
00
100
100
mfd-500V, 40 mfd O V
50 -ASST. CERAMIC CON-
100
L-1 DENSERS-Most desirable values
4-50' HANKS Hook -Up Wire
100
._- -..__
assorted colors ._......._
in
&
PIN JACKS ROCAOtypeUGS
-
100
5"
7"
TAPE REEL.....
TAPE REEL....
RADIO
PIECES wires complete wi
Li
....09
....12
....29
....35
TAPE REEL....
31/4" TAPE REEL....
i-
I
100
1
100
tog
DENSERS deisiable IMPes
C PACITORDISC
.
100
R.L.
TERMINAL ST
all types, 1 -lug to 6 -lug
TNIQVERSAL4 "PM
PS
1 00
1
SPEAK ER
100
MOTOROLA
110
HEP 103110DE=
POWER ADAPTOR 12 Volt
in -6V, 7.51' 9 Volt Out-30f[Á
4195
CAR
50 -ASST. TUBULAR
RADIO
TRANSISTOR
asst type good, bad,
100
CONE
DENSERS Popular values
_
broken,
150
as -is, potluck
RECORDER
TAPE
assorted types good, bad
brokers, as -is, potluck _____
ASST. /a W RESISTOR
200
Top Brands, Short Leads,
400
I
100
Excellent Selection
75 -ASST '/4 WATT RESISTORS 00
stand, choice ohmages, some it 5% 1
100-ASST
t/a
WATT RESISCORS 100
50list -price
20-
PRECISION RESISTOFS
$50 less 58% __
ASSORTED WIREWOUND
1--1 RESISTORS, 5, 10, 20 watt ._
10 -ASST SLIDE SWITCHES
L-1 SPST, SPDT, DPDT, etc.
25- SYLVANIA HEAT SINUS
For Transistors
20- ASSORTED TV COILS
L-1 I.F. VIDEO, sound radio, e
ELECTROLYTIC COND.
200/300/100/100 MFD-25V
00
1
asst.
-
100
100
_
-
Best TUNER "SARKES TARZIAN"
ever made
last word for stability,
definition & smoothness of operation.
An opportunity
improve and bring
your TV Receiver up -to-date.
795
Complete with Tubes
WESTINGHOUSE FM TUNER
#476- V -015D0 Transistor
WESTINGHOUSE FM TUNER
(12DT8 Tube)
UHF TUNER-Transistor Type
Used in all TV sets
UHF TUNER -TRANSISI-1 TOR TYPE Model .#85X4
ADMIRAL TV TUNER
Model #94C393 -1 (2HA5 -4LJ8)
Model #T94('445 -3 (Transistor)
WELLS GARDNER TUNER Part
#7A 120 -1 (4GS7 -2HA7 Tubes)
)20K5 -4LJ8)
Model #EP 86 xER
UHF /VHF TUNER
ni
Li
1
Transistorized
I- ELECTROLYTIC COND
100 MFD -300V
3-ELECTROLYTIC COND
.
.
5
395
395
795
4in
100
1
0
1
00
1
in 4-
199
100
-
2- ELECTROLYTIC
red -25V
COND
00
1
1000
250-ASST
/GS
795
795
Li finest popular selection
Self Tapping SCREWS
....
Li #6, #8, etc.
100 -ASST 6/32 SCREWS
Li and 100 -6/32 HEX NUTS
995
7
179
100
249
195
100
100
100
100
95
495
100
75/30mfd150V
ELECTROLYTIC CONDENIIERS 100
1
200/200 mfd. -200V
SOLDERING
Li best types and sizes
section rods
BLUE LATERAL Magnet Assy.__
Replacement for most color TV's _
5 -10K-2 WATT BIAS POTS
Used in solid state application
COLOR CONVERGENCE Assy.
Universal type--good for most sets
COLOR -TV RECTIFIER -Used
in most color sets -6500 kv 3 for__
2 COLOR -TV CRT SOCKETS
Wired leads, for all color TV's
3-RCA 110° CRT SOCKETS
Wired leads. for all TV's
4-36" Hi -Fi CABLES RCA Molded Phone plug at one end stripped
and tinned leads on other end
Polarized CHEATER CORD
Grey
70° COLOR TUBE
BRIGHTNER
90° COLOR TUBE
BRIGHTNER
100
.-
20/20 MFD-450V ......____ ._ _
40 -ASST. TUBE CARTON*
Most popular types
2- ELECTROLYTIC Centimeters
300 mfd -200V,
300/60 mfd -150V
ELECTROLYTIC COND
399
100
ET 813x196, 6GK5 -6BLS) ._.__- _..595
UNIVERSAL TV Antenna Back of 999
set mounting
100
I-
-to
100
300
40
TUBE
-
TV ALIGNMENT TOOLS
most useful assortment ++1
4
TV ALIGNMENT TOOLS
For Color TV P?
6
TV COLOR ALIGNMENT
TOOLS Most popular type
49
100
DIODE CRYSTALS
1N48, 1N60, 1N64, etc.
& CONTINUITY CKR.
Model FT425
198
(Tests fuses, heaters, lamps, Etc.)
Stereo Cartridge -CN -72
BRAND NEW
99C
Klein for Light Work
J99569 in
TUBES
Li 1N34,
40
3"
--
..1.19
..1.97
..1.29
..1.59
..1.49
-120 ..
64 Min.
80 Min.
Cleaner
stand, choice ohmages, some I t 5%
I WATT RESIST ORS 100
stand, choice ohmages, some it 5%
00
35 -ASST 2 WATT RESIST ORS
1--1 stand, choice ohmages, some i t 5%
Latest Compact
Model good for
all 41 me TV's.
flexible- forked Tongue 6" long 1
100
H7 RCA
KLEPS 30-
8-Track
8-Track
8-Track
.59
......
C -90
C
70 -ASST
41 MC
KLEPS 20-
C -60
CASSETTE
CASSETTE
CASSETTE
6- TRANSISTOR
L_1
SARKES TARZIAN TUNER
Boathook Clamp 4s/q' long
100
...
20- 40 OHM
3 SPEAKER -7
90°
KLEPS 10-
100
(10 for $15.00)
50
8"
HEAVY DUTY 10 OZ.
SPEAKER Ceramic Type
Ohm 4
Duty 10 oz. Speaker 450
8 Ohm
Ceramic Type
L-1 (1
42°
TELEMATIC Test Jig ModelEJ -190- Master Rigs4(195
7
Combo Rigs -Econo Rigs
...
...
-
3.49
in
{7
__
FLYBACK TRANSFORMER 295
L
all type TV's (Blk. & Wht.)
395
TV DEFLECTION YOKE
for all type TV's (Blk. & Wht.)
K TBAkN &FORM)ER 200
for all type TV's
200
7o° TV DEFLECTION YOKE
for all type TV's (Blk. & Wht.)
OLYMPIC & SHARP FLYLi BACK Part #8FT592 Equiv.
200
Stancor #110-408Thordarson #F1Y339
90° COLOR YOKE For all
Rectangular 19 to 25"
795
Color CRT's
70 COLORE YOKE
095
For all round color CRT's
NIVICO COLOR
1-1 FLYBACK Part #A20411 -B
795
Boathook Clamp 7" long
e"
-
7
in performance
Tuner-Mate KT -730
1595
159
UNIVERSAL SPEAKER
F.A.
Top quality Special buy
589
12" UNIVERSAL SPEAKER
Li Top Quality . . . Large Magnet J
10" PHILCO SPEAKER
395
Top Quality
Large Magnet
299
UNIVERSAL SPEAKERLarge Magnet- Special Buy .. ______
1 29
3" UNIVERSAL TWEETER
1 oz, Magnet
21/a "x4" SPEAKER
EA. 69e
J
Special Buy 10 for $5
4"x6" "QUAM" 16 OHM SPK.
179
Special BUY
Large magnet
8"
DEFLECTION YOKE
in 90°
SENCORE
200
--
.19
.78
.82
.90
1.49
1.89
.97
1.32
1.99
1200'
1800'
2400'
3600'
RCA 1100 FLYBACK plus
Leadoil
.
225'
600'
600'
900'
"COMBINATION SPECIAL" 695
110°
Portable "Substi- Tuner "
Instant Tuner Check
---1200'
-1800'
--
110°
E/CO
TELMATIC
5"
5"
5"
5"
7"
7"
7"
7"
A95
TV DEFLECTION YOKE
for all types TV's inel schematic a1
Test Equip. Special Discount Prices
15-
Built in speaker/
...
List price $13.90 395
Your price
10% off in lots of 3.
0950
Completely assembled -AS IS
LL
needs slight adjustments
KANDU- Printed Circuit Kit
Trace & Etch your own circuits -x]95
7
easy to use instructions
100
ASSORTED IC'S
For Experimenters
'!95
RADII)" NEW
TRANSISTOR
Excellent value
Silicon NPN HV TRANSISTOR
100
RCA -SK- 3021 -Hep -240
ea.
RCA -SK -3026-Hep -241
r--1 Transistor Specials -Your Choice
100
SK3006, SK3018, SK3020
ea.
SK3122, SK3124
Transistor Specials -Your Choice 198
SK3040
SK3009, SK3024,
...
Records up to 3
.
microphone for talk -into convenience
Illuminated signal shows when a
minutes of messages
message is waiting. Control adjusts playback volume without
795
Capstan Drive:
affecting recording volume
TV.
MARKET SCOOP COLUMN
TUBE AM -FM STEREO
31/4"
MESSAGE CENTER
18KVadequate
width Incl. Schematic
Diagram
application
for any
3"
ALL TRANSISTOR HOME /OFFICE
Coil produces
assuring
SHANNON MYLAR RECORDING TAPE
WESTINGHOUSE
-
order
L
WOOD SCREW :ì
-ASST 8/32 SCREWS
1-land 100-8/32 HEX NUTS
100-ASST 2/56 SCREWS
100
and 100 -2/56 HEX NUTS
100 -ASST 4/40 SCREWS
and 100 -4/40 HEX NUTS
100 -ASST 5/40 SCREWS
_
and 100-5/40 HEX NUTS
500-ASSORTED RIVETS
-.
sizes
selected
most useful
300 ASSORTED WASHERS
most useful selected sizes
100 -ASST RUBBER BUMPERS
for cabinet bottoms -other men _..
100-Asst RUBBER GROMMETS
best sizes
DIPPED MYLAR CAP.
LI
I5-
.01 -600V
15-600V
15-
DIPPED MYLAR CAP.
.033
_
-_--
...... ... _._
DIPPED MYLAR CAP.
.0033 -1000V _.._...__...DIPPED MYLAR CAP.
100
100
100
1
00
00
1
100
1
100
100
100
100
100
100
1
00
00
1
199
+
100
1
100
1
bracket, (flyover 295
With
Quartz- Crystal
189
needle
8 "Lads 630VT30MAí5O
Hrs) 100
15most color TV sets 3579.545 KC
Stereo Headphones Hi -Fi Quality
95
8-MINI PILOT BULBS With 12" 00 Li For
5
ASST
VARISTOR
GLOBAR
.047 -400V
5
1
-6.3V,
Hrs.)
Stereo
Leads
150MA
(5000
Complete with
plug
Popular replacements for
100
IS- Molded Tubular CapacIttrs
10- STANDARD TRANSISTORS 00
00
32'-TEST PROD WIRE
most COLOR TV
.056 -400V
Li NPN & PNP 2N404, 2N414, etc.
Li DELUXE QUALITY red & black L
UHF or VHF Matching Trans.
100
Shielded MIKE CABLE
189
00
10 -MINI ELECTROLYTIC Cond
15-DIPPED MYLER Condoners 00
1
Simple Fool -proof installation
Grey 25/1
_______ ___.._.._
For Transistor & miniature work
.0039 400V
IMMEDIATE DELIVERY
Minimum Order ;5.00
Scientific light packing for safe delivery at minimum cost.
HANDY WAY TO ORDER
Send check or money order, add extra for shipping. Lists of new offers will be returned in your order.
Please specify refund on shipping overpayment desired:
MERCHANDISE (our choice) with advantage to customer
CHECK
POSTAGE STAMPS
...
25'
-
...
...
BROOKS RADIO et TV CORP.,
487 Columbus Ave., New York, N.Y. 10024
Circle
62
on
reader
service card
www.americanradiohistory.com
212-874 5607
C
r
to
cn
83
APPLIANCE & INDUSTRIAL MAINTENANCE
nursTi IRE TUBE
TESTERS OSC
TESTERS* VOIt,
it eehectm
CASES
AF, RF & SWEF,/
TORS
AC LEAKAGE;/
ETERS
SOLID STAT"
TRONIC
VOLTOHMv'
METERS
ISOTAPS
SOUND
GENERATI°"-,NITORS
BATTER'
UPPLIES
PORTAF
URRENT
AC VOf
LOR BAR
TESTE
SSORIES
._
`
°
.
For
faster
service
USE
ZIP
RCA Test Instruments...
The broad line for a wide range
of applications.
Whether it's for use in consumer
log. It's yours free for the asking.
or industrial electronics, laboraJust contact any one of the
tories, schools, safety tests or for
more than 1,000 RCA Distribueveryday electrical or electronic
tors worldwide. Or write RCA
maintenance, there's an RCA
Distributor and Special ProdElectronic Instrument for your
ucts Division, Cherry Hill Ofapplication.
fices, Camden, N.J. 08101.
And you can find out about
them all in the new 1975 RCA
Electronic
Electronics Instruments CataInstruments
Circle 63 on reader service card
RCA
new lit
CODE
on
all
mail
All booklets, catalogs, charts,
data sheets and other literature
listed here with a Reader Service
number are tree. Use the Reader
Service Card inside the back
cover.
REPLACEMENT CATALOG AND
TELEVISION GUIDE FOR TRANSFORMERS.
66 -page catalog features several hundred
replacement transformers. Includes color
TV components, deflection yokes, flybacks,
vertical outputs and filter chokes as well
as power, filament and audio transformers.
-Triad -Utrad Litton Distributor Services,
305 North Briant Street, Huntington, IN
1975 -76
46750.
Circle 43 on reader service card
QUARTZ CRYSTAL CATALOG. 10 -page
catalog provides product information on the
company's line along with application engineering information. Contains: general engineering and design information, method of
testing, definitions, low frequency crystals,
medium frequency crystals, temperature coefficient curves generalized for medium and
high frequencies, high- frequency crystals
and mil spec crystals. -Crystek Crystals
Corp., 1000 Crystal Drive, Fort Myers, FL
33901.
The
IIMIAPvelng Amp
Take
it anywhere!
FREE
bufglar-
alarm catalog
over 500
systems,
detectors,
controls,
sounders,
tools, locks,
supplies
TO PROTECT HOMES,
BUSINESSES, INDUSTRY
PUT IT TOGETHER
SLING IT OVER YOUR SHOULDER
AND YOU'RE READY TO GO
Huge selection of hard -to -find security
equipment from stock. 96 fact -filled pages
loaded with 100's of highest quality professional alarm products, technical notes,
diagrams.
ONE -STOP SUPERMARKET
SELECTION INCLUDES:
ultrasonics, radar, infrared, undercarpet
for only $39.95 plus shipping 6Ibs. for the
mats, magnetic contacts, smoke & heat de-
complete kit.
penlight battery powered
5' accoustic suspension speaker(l0ozmagnet)
over 10 watts peak power (1.2w R.M.S.)
phone, high & low level outputs
sturdy vinyl covered case
»extra easy assembly
tectors; Controls; Alarms: bells. sirens,
Our FREE catalog holds even
greater surprises! Send for it!
PAIA Electronics,
1020 W.Wilshire Blvd.,
Dept. "R ",
Oklahoma City, OK 73116
Circle 64 on reader service card
phone dialers, lights, guard panels. Large
selection of tools, relays, wire, holdup
alarms, books. Fills need for industry, alarm
cos., businesses, homes, institutions. Order
your copy today.
mountain west alarm
4215 n. 16th st.
phoenix, az. 85016
(602) 263-8831
Circle 65 on reader service card
www.americanradiohistory.com
TECHNICAL BOOKS CATALOG. 42-page
catalog describes over 339 current and
forthcoming books plus 14 of the firm's
electronic book /kits. Includes books on
advertising, appliance repair, audio, hi -fi,
stereo, do- it- yourself, electronic music,
transistors, semi- conductors, hobby and
experiment, medical elecrtonics, test equipment and much more. -Tab Books, Blue
Ridge Summit, PA 17214.
Circle 44 on reader service card
PROFESSIONAL PRODUCTS CATALOG. 24page catalog features unidirectional dynamic microphones, ribbon microphones,
omni -directional
dynamic
microphones,
utility microphones, microphone mixers,
audio control components, stereo preamplifiers, "plug -in" problem solvers, microphone accessories, component accessories
and stereo cartridges. Contains many illustrations. -Shure Brothers Inc., 222 Hartrey
Avenue, Evanston, IL 60204.
Circle 45 on reader service card
DIAGRAM
AND SERVICE MATERIAL for
practically any TV, radio or stereo set can
be secured for a reasonable price. This
firm supplies such material from its own
manuals, Sams' Photofacts, old Rider's
and its files of original factory data accumulated over many years. This data goes all
the way back to antique radios and early
TV's as well as material of all manufacturers of recent past and right up to sets
of the 70's. The company promises to
quote by return mail. Most prices are about
$2.00, some lower and a few higher.
Supreme Publications, 1760 Balsam Road,
Highland Park, IL 60035.
R -E
Circle 46 on reader service card
-
next month
If
You Work In
Electronic:
GRANTHAM OFFERS YOU
College -Level Traini ng
and a college degree.
AUGUST 1975
Liquid Crystal Clock You Can Build
It has 2 -inch tall numbers and takes only
a single IC plus a dozen other parts to
complete. It will cost about $70 to build.
Electronic Circuit Design,
Engineering Analysis (including mathematics thru calculus),
Classical and Solid -State
Physics, Engineering Design,
etc., etc., are all part of
the Grantham home -study degree program in Electronics
Engineering.
PUT PROFESSIONAL
RECOGNITION IN
Hi -Fi Tape Transports
tape decks even the transports include a considerable amount of
electronic circuitry. See what's there so
it won't be new the first time you examine
one of these decks.
In the new
YOUR CAREER.
By adding college level home training
and a college degree
to your experience,
you can move up to
greater opportunities in electronics.
Special Test Equipment
None of it is new, but all are rarely seen.
For example, have you ever heard of a
phase lock synchronizer.
Grantham offers the
A.S. E.T. degree by correspondence. After earn-
How To Use Your Oscilloscope
ing this degree, you may
continue with additional
correspondence plus a 3 -day
There are heaps of controls on that front
panel and if you don't use them correctly, you're not going to get a trace
that means anything. So here's a rundown on how to handle a modern scope.
We know you'll enjoy it.
residential seminar and certain transfer credi s, to
earn the B. S. E.T. degree. Then, the B. S. E H. is
available through further study.
.
GRANTHAM SCHOOL OF ENGINEERING
2000 Stoner Ave., Los Angeles CA '40025
Telephone (213) 477 -1901
Worldwide Career Training thru Home Sjuúy
Mail the coupon below for free bulletin..
Lab- Tested Hi -Fi Equipment Reports
Len Feldman continues to present detailed reports that tell you more about
hi -fi gear than you've ever seen before.
r
Grantham School of Engineering
2000 Stoner Ave., Los Angeles, CA
RE
-'5
9025
years. Plea e
I have been in electronics for
mail me your free bulletin which gives details -3oa_
cerning your electronics degree programs.
PLUS
Age
Name
State -Of -Solid -State
Japanese Transistor
Replacement Guide
R-E's
Address
Step-By -Step Troubleshooting Guide
City
State
Zip
L
Circle 66 on reader service card
www.americanradiohistory.com
85
MATHEMATICS
ELECTRONICS
We are proud to announce two great
new courses for the electronic industry.
These unusual courses are the result of
many years of study and thought by the
President of Indiana Home Study, who
has personally lectured in the classroom
to thousands of men, from all walks of
life, on mathematics, and electrical and
electronic engineering.
You will have to see the lessons to
appreciate them!
NOW you can master mathematics
and electronics and actually enjoy doing
.
WE'LL
YOU
INDUSTRIAL TEST EQUIPMENT
(continued from page 69)
An instrument for reading light levels
is shown in Fig. 21. This is Simpson's
Model 408 Illumination Level Meter.
This is used to get a check on light levels
in work areas, etc.; once again necessary
for compliance with certain OSHA regulations.
For certain tests, a continuous monitoring and recording of quantities can be
very helpful. This can check line voltage,
load current, temperature, and other
things. Figure 22 shows a typical unit, the
Amprobe Model LAVA81, which is a
recording Volt- Ammeter. Other models
SAVE
MONEY
S__
ONY.
CJ/
pIONEER
Sans-ui
ON FAMOUS BRAND
NATIONALLY
ADVERTISED
it!
WE ARE THIS SURE: you sign no
contracts -you order your lessons on a
money -back guarantee.
In plain language, if you aren't satisfied you don't pay, and there are no
strings attached.
Write today for more information and
your outline of courses.
You have nothing to lose, and everything to gain!
STEREO COMPONENTS,
VIDEO & PROFESSIONAL
PRODUCTS EQUIPMENT
WRITE TODAY FOR OUR QUOTE AND
OUR COMPLETE AUDIO CATALOG.
FAST DELIVERY IN FACTORY SEALED CARTONS
FOR IMMEDIATE QUOTE
CALL (202) 723 -6060
THE COST OF YOUR CALL WILL BE DEDUCTED
FROM ANY ORDER OVER S200.00.
The INDIANA
HOME STUDY INSTITUTE
A.D.R. VIDÉO
DEPT. RE -775, P.O. BOX 1189
PANAMA CITY, FLA 32401
Circle 67 on reader service card
r Some stores,
sell test
equipment
at discount
6200 CHILLUM PLACE N W.
WASHINGTON. D 20011
in the same line record temperatures, AC
voltage, or voltage and current simultaneously. Any quantity that can be converted to an electrical signal by a transducer can be recorded. Simpson also
makes a strip -chart recorder. It's their
Model 603.
Lastly but not leastly, here is an ingenious little instrument that can really
be very handy. It's the Amprobe Model
ALP-501. It's a conventional volt-ammeter-ohmmeter, with something added.
RADIO SUPPLY CO., INC.
558 Morris Ave., Bronx, N.Y.
Tel: 1212) 585 -0330
008A MICROCOMPUTER KIT
8008 CPU, 1024 X 8 memory; memory is
expandable. Kit includes manual with schematic, programming instructions and suggestions; all ICs and parts supplied except
cabinet, fuses and hardware.
Includes p.c. boards
$375.00
MANUAL ONLY, $25.00
(No Discount on Manual)
TRANSISTORS
$.08; $5.95/100
NPN General purpose TO -92
PNP General purpose TO -92
$.08; $5.05/100
Other transistors and JFETS available at our
usual low prices; all are tested, good units.
Specs available in our flyer.
SENCORE
FLUKE, HICKOK and LEADER
FORDHAM
RIGS ELECTRON ICS
008A -K ASCII KEYBOARD INPUT KIT
Kit includes keys, p.c. board, ICs, schematic
and instructions. This kit is intended to interface ONLY with the RGS Electronics 008A
Microcomputer
*$135.00
B &K, EICO, RCA,
FREE CATALOG
Honored on
Circle 69 on reader service card
008A -C AUDIO CASSETTE ADAPTER KIT
Kit includes all ICs, p.c. board, schematic
and instructions. Will interface most audio
cassette recorders to the 008A Micro- computer. NOT intended to interface with any other
computer.
*$100.00
prices.
At Fordham
we discount
their discount
prices.
Complete line of tubes,
tools and electronic supplies
Chge/BankAmericar
RGS ELECTRONICS, 3650 Charles St. Ste K,
Santa Clara, CA 95050
(408) 247 -0158
It has an automatic "wire- identifier" feature. You simply plug the ends of the
wires into the Station-Marker Holder,
and then go to the other end. There, just
touch the probe to any of the wires, and
the meter will read out its number! Note
the "1 through 10" boxes on the meter scale. It's called the "Line- Probe."
The service technician should be as
familiar with the arsenal of specialized
test equipment as he is with the common
R -E
everyday test equipment.
sell many ICs and components not listed
in this ad, included most of the 7400 series;
send a stamp for our free flyer.
We
TERMS OF SALE: All orders prepaid; we pay
postage on all U.S. orders. Handling charge
of $1.00 on U.S. orders under $10.00, foreign
orders under $25.00. California residents
please include sales tax. Please include
name, address, and zip code on all orders
and flyer requests.
`DISCOUNTS: 10% OFF ORDERS OVER
$25.00 -20% OFF ORDERS OVER $250.
PRICES SBJECT TO CHANGE WITHOUT NOTICE.
Circle 70 on reader service card
Circle 68 on reader service card
www.americanradiohistory.com
R -E's
SUBSTITUTION GUIDE FOR JAPANESE TRANSISTORS
PART XXVIII
by ROBERT & ELIZABETH SCOTT
MAL
MOT
ARCH
DM
G-E
ICC
IR
2S42
2S43
2S44
2S45
RS276-2006
RS276-2005
RS276-2005
RS276-2004
T-230/232
T-254
T-254
T-253
NA
NA
ICC-230/232
ICC-254
CC-254
ICC-253
NA
TR-01
2S46
GE-3
GE-52
GE-52
GE-2
GE-52
TR-05
TR-05
TR-05
TR-05
PTC
PTC
PTC
PTC
PTC
2S47
2S49
2S51
NA
NA
T-253
NA
NA
RS276-2004
RS276-2004
T-253
T-253
ICC-253
ICC-253
TR-05
TR-05
TR-05
TR-05
TR-05
PTC
PTC
PTC
PTC
PTC
102
102
102
102
102
NA
HEP-253
2S52
2S53
GE-52
GE-2
GE-2
GE-2
GE-2
NA
RS276-2004
2S54
2S56
2S57
RS276-2005
RS276-2005
T-254
T-254
GE-52
GE-52
ICC-254
ICC-254
TR-05
TR-05
HEP-254
HEP-254
NA
NA
GE-S1
NA
TR-17
PTC 102
PTC 102
PTC 107
2S58
NA
NA
2560
2S75B
RS276-2003
T-639
NA
NA
2S91
RS276-2004
RS276-2004
T-253
T-253
GE-50
GE-2
NA
GE-2
GE-50
NA
ICC-639
NA
ICC-253
ICC-253
TR-17
TR-05
TR-85
TR-05
TR-17
PTC 107
PTC 102
NA
PTC 102
PTC 107
2S93
2S95
2S96
2S97
2S98
RS276-2004
T-253
GE-50
ICC-253
NA
NA
GE-1
NA
NA
NA
NA
NA
NA
NA
NA
GE-1
NA
NA
TR-17
TR-21
TR-85
TR-85
TR-85
25101
RS276-2009
RS276-2009
RS276-2009
RS276-2009
RS276-2005
T-50
T-50
T-50
T-50
T-636
GE-61
ICC-50
GE-63
GE-63
GE-63
GE-50
ICC-50
ICC-50
ICC-50
ICC-636
RS276-2005
RS276-2005
RS276-2005
RS276-2023
NA
T-636
T-636
T-636
T-52
NA
GE-50
GE-54
GE-50
GE-20
NA
2S141
2S142
2S143
2S144
RS276-2005
RS276-2005
RS276-2003
T-636
T-636
T-635
GE-50
NA
NA
25145
RS276-2003
T-635
2S146
2S148
25155
2S159
25160
RS276-2003
T-635
NA
NA
GE-51
GE-51
RS276-2004
RS276-2004
RS276-2004
T-253
T-253
T-253
GE-2
GE-2
GE-2
ICC-635
NA
ICC-253
ICC-253
ICC-253
2S163
2S167
2S174
2S175
RS276-2005
RS276-2004
RS276-2004
NA
NA
T-254
T-253
T-253
NA
NA
GE-52
GE-53
GE-53
GE-50
GE-2
ICC-254
ICC-253
ICC-253
NA
NA
TR-O5
RS276-2004
RS276-2005
NA
T-253
T-254
T-254
GE-2
GE-52
GE-53
ICC-253
ICC-254
ICC-254
NA
NA
NA
NA
GE-51
NA
NA
NA
2S92
25102
25103
25104
25109
25110
25111
2S112
2S131
2S134
25176
2S178
2S179
2S189
25201
2S273
2S277
25301
25302
2S302A
2S303
NA
NA
NA
NA
RS276-2021
NA
RS276-2021
2S304
25305
25306
25307
RS276-2021
2S321
NA
2S322
2S323
2S324
2S326
2S327
NA
RS276-2021
RS276-2021
RS276-2023
RS276-2023
RS276-2023
RS276-2023
RS276-2023
GE-51
GE-50
GE-51
GE-50
ZEN
325/
104
102
102
100
102
WEP-230
3003
3005
3005
3005
3005
RT-120
RT-118
RT-118
RT-118
RT-118
ECG
ECG
ECG
ECG
ECG
102
100
100
100
100
WEP-631
WEP-254
WEP-254
WEP-254
WEP-254
?
NA
SK 3004
SK 3004
NA
RT-120
RT-120
NA
ECG 102
ECG 102
NA
WEP-631
WEP-631
NA
?=N 305
?EN 305
NA
NA
HEP-639
NA
HEP-253
HEP-253
SK 3008
SK 3005
NA
SK 3005
SK 3008
RT-118
NA
RT-118
RT-118
ECG 126
ECG 100
ECG 102A
ECG 100
ECG 100
WEP 635
WEP 254
NA
WEP 253
WEP 253
PTC 107
PTC 136
PTC 109
NA
PTC 109
HEP-253
NA
NA
NA
NA
SK
SK
SK
SK
SK
3008
3122
3006
3006
3006
RT-118
RT-102
RT-188
RT-188
RT-188
ECG 100
ECG 123A
ECG 126
ECG 126
ECG 126
WEP
WEP
WEP
WEP
WEP
253
735
635
635
635
?
TR-24
TR-25
TR-87
TR-87
TR-17
PTC
PTC
PTC
PTC
PTC
SK
SK
SK
SK
SK
3122
3122
3024
3024
3008
RT-102
RT-102
RT-114
RT-114
RT-119
ECG 123A
ECG 123A
ECG 128
ECG 128
ECG 126
WEP
WEP
WEP
WEP
WEP
736
736
243
243
635
Z=N 100
136
107
HEP-50
HEP-50
HEP-50
HEP-50
HEP-636
ICC-636
ICC-636
ICC-636
ICC-52
NA
TR-17
TR-08
TR-17
TR-53
NA
PTC 107
PTC 107
PTC 107
PTC 133
NA
HEP-636
HEP-636
HEP-636
HEP-52
NA
SK
SK
SK
SK
SK
3007
3005
3008
3122
3123
RT-188
RT-118
RT-119
RT-102
RT-136
ECG 126
ECG 100
ECG 126
ECG 123A
ECG 176
WEP 635
WEP 254
WEP 635
WEP 736
NA
ICC-636
ICC-636
ICC-635
TR-17
TR-85
TR-17
TR-17
TR-85
PTC 107
NA
PTC 107
NA
PTC 107
HEP-636
HEP-636
HEP-635
SK 3006
SK 3006
SK 3006
NA
SK 3006
RT-188
RT-188
RT-188
RT-188
RT-188
ECG
ECG
ECG
ECG
ECG
126
126
126
160
126
WEP 635
WEP 635
WEP 635
NA
WEP 635
NA
NA
NA
NA
PTC 102
PTC 102
PTC 102
HEP-635
NA
HEP-253
HEP-253
HEP-253
SK 3006
NA
SK 3005
SK 3005
SK 3005
RT-188
RT-188
RT-118
RT-118
RT-118
ECG
ECG
ECG
ECG
ECG
126
160
100
100
100
WEP 635
NA
WEP 254
WEP 254
WEP 254
Z :N 311
TR-08
TR-08
TR-17
TR-85
PTC 102
NA
NA
PTC 107
NA
HEP-254
HEP-253
HEP-253
SK
SK
SK
SK
SK
3004
3005
3005
3006
3006
RT-120
RT-118
RT-118
RT-188
RT-188
ECG
ECG
ECG
ECG
ECG
102
100
100
160
126
WEP 631
WEP 253
WEP 253
NA
WEP 635
Z :N 305
z :N 304
2-:N 304
NA
NA
TR-05
TR-05
TR-85
NA
TR-85
PTC 102
PTC 102
PTC 135
NA
PTC 102
HEP-253
HEP-254
HEP-254
NA
NA
SK 3005
SK 3004
SK 3004
NA
NA
RT-118
RT-120
RT-121
RT-188
RT-121
WEP 253
WEP 631
WEP 250
2i
ICC-253
NA
NA
ICC-635
T-51
GE-21
NA
ICC-51
T-52
T-51
GE-22
ICC-51
T-51
NA
T-51
T-51
NA
GE-22
ICC-51
NA
ICC-51
ICC-51
NA
T-52
T-52
T-52
T-52
T-52
WOR
ECG
ECG
ECG
ECG
ECG
NA
NA
GE-21
SYL
RT-124
RT-120
RT-120
RT-118
RT-120
GE-54
GE-21
GE-22
GE-22
SPR
105 HEP-230/232 SK 3009
SK 3004
102
HEP-254
SK 3004
102
HEP-254
SK 3005
102
HEP-253
NA
SK 3003
102
NA
NA
NA
RCA
ICC-52
GE-21
CC-52
GE-22
GE-22
GE-22
GE-22
ICC-52
ICC-52
ICC-52
ICC-52
TR-05
TR-05
TR-05
139
121
121
NA
TR-88
TR-88
TR-88
TR-88
NA
NA
NA
TR-88
NA
NA
NA
NA
NA
TR-30
TR-30
TR-52
TR-52
TR-52
TR-52
TR-52
TR-52
NA
NA
NA
NA
NA
NA
NA
NA
NA
HEP-253
HEP-253
NA
HEP-635
NA
NA
SK
SK
SK
SK
SK
NA
SK 3025
NA
RT-115
RT-115
RT-187
RT-115
3025
3025
3114
3118
3114
RT-115
RT-115
RT-115
RT-115
RT-115
NA
NA
HEP-51
HEP-52
HEP-51
NA
SK 3025
SK 3025
HEP-51
NA
HEP-51
HEP 51
NA
SK
SK
SK
SK
SK
HEP-52
HEP-52
HEP-52
HEP-52
HEP-52
SK 3114
SK 3114
SK 3114
SK 3114
SK 3114
RT-115
RT-115
RT-115
RT-115
RT-115
WEP-631
WEP-631
WEP-254
WEP-631
'7_E
N
?EN 305
_=N 305
s =N 304
NA
NA
=N 304
NA
?=N 304
?=N 304
NA
? =N 314
NA
Z=N 304
=N
304
Z
304
NA
NA
NA
NA
_N
Z:N
100
Z=N 100
ZEN 100
=N 312
I
:I
EN
312
Z EN 312
.7:N 312
NA
NA
:N 312
ZI':N 312
Z' _N 311
NA
21:N 311
NA
Z :N 304
Z :N 304
Z'':N 304
304
ECG 100
ECG 102
ECG 102A
ECG 160
ECG 102A
NA
WEP 250
NA
ECG 103A
ECG 129
ECG 129
ECG 159
ECG 129
NA
WEP 242
WEP 242
NA
WEP 242
NA
NA
ZI
129
129
159
159
159
WEP 242
ZE N 101
159
159
159
159
159
242
242
242
242
242
ECG
ECG
ECG
ECG
ECG
ECG
ECG
ECG
ECG
ECG
Zt:N 305
NA
WEP
WEP
WEP
WEP
WEP
N 101
NA
ZI N 101
NA
WEP 242
WEP 242
WEP 242
N
21'.N 305
NA
ZÆ
N 101
ZE N 101
NA
NA
NA
NA
NA
NA
c_
C
co
(to be cor inued)
cVi,
87
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CONVERT any television to sensitive, big screen oscilloscope. Only minor changes
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FREE catalog. Most unusual electronic kits
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NEW organ kit builders
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SAN FRANCISCO, (Al 90126
DIGITAL clock calender kit. (7001 IC, transistors, resistors, diodes, capacitors, Xform-
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-digit 24 -Pln
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Up to 20 mils per seg. at 5V.
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MICROPROCESSORS!
ROMS! RAMS!
MEMORIES!
MM5311
for $1
Green
NATIONAL
LM -340T VR's
IN4001
50 10 far 45c
1N4002 10010 for 55c
1N4003 200 10 for 65e
1N4004 400 10 for 75c
1P14005 600 10 for 85c
1N4006 800 10 for 99c
IN4007 1000 10 for 1.29
TUNERs1. AMPLIFIER:
.
Cl
.3400.260
Imagine a chip (MK50250)
"Beep!" and audible alarm!
All others are external. It
also features internal brightness control. The CT7001
requires external trigring
of alarm, date of the month
and direct drive to LED
readouts. Both require min.
imum current drain and
voltages, for either 4 to 6
LED readouts. 12 or 24
PIV
2.50
1.10
1.39
1.69
1.69
1.95
1.95
1.95
,88
,69
2.50
2.50
2.50
=.50
LM1800
RC2556(D
CA3026
CA3045
CA3054
CA3065
CA3082
LM3900
Red
RECTIFIER PRICES
,==t
Type
.99
3.50
2.25
.59
.59
.59
.59
.59
.49
RC4136'0 1.95
2.50
RC4195
2.10
LM4250C
.59
LM7520
.59
LM7521
.59
LM7522
.59
LM7523
.59
LM7524
.59
LM7525
.59
LM7528
.59
LM7529
LM7535
.59
LM1496
Jumbo
"BLASTAWAY"
ON 1N4000
AM -FM- MULTIPLEX
rr"ao.
to 190V. Properly multi plexed, to a 18 -pin connector (soldering too). For
ealculatora, etc. Glass wi
pow, Character height: e2î.
3 for $5 Readout only 3 x ./4"
hours. AM and PM.
CT7001 Alarm and Date.... $6.95
-
MUX.OIAL
¡7
type
pers
This
AM- FM- MULTIPLEX
Sperry Rand,
spec sheet.
MK50250
1.75
.69
1.05
1.05
1.95
1.95
.49
SP- 425 -09. With 8 rovIng
decimals, and a fixed decimal, 7- segment. Color: ORANGE, Anode voltage 100
calculator clock circuit. The
transformer is the new
Toroidal transformer itself
worth our asking price. Only
IA a %I ". Electrical
110 vac input, output. With
/
SOLID STATE
TUNER AMPLIFIER!
60 -WATT STEREO
guarantee.
charge tubes. Completely
wired. As extra feature has
1
20 -WATTS
nitH is designed same
60 watt tuner amp unit,
except 20- watt tuner a n
j
money back
and
CLOCK ON THE CHIPS
4 x 21/a" G -10 glass etched pc board,
with 10 OAK "smooth touch" white key* with black
numerals, plus diagram on "touch tone encoder ". Makes
many "keyboard systems" readily available. 0-to -9
as
carries
'BEEPER" AND "DATER'
Meaauras
Ye
encapsulated in red epoxy lens.
Outperforms all reflective bar types. MORE BRILLIANT! Made for distance and wide -angle viewing. Fits
into standard 14 pin DIP socket. Kit includes MAN-fi,
right angle IC socket, edge connector, pe board, assorted resistors and capacitors, SN7476, SN7447,
S57490, Molex sockets and booklet.
9.95
Same as above except uses MAN-64, 0.4 ALL LED
Only S9,(18
readout. MAN -1 characteristics
the
Kit includes
kit
Every
GAS DISCHARGE DISPLAY
POWER SUPPLIES
01
3 x 3" pc board power supply with brightness control
for the NDP or any gas dis-
0.5
JUMBO 0.6" MITY DIGIT DCM
MAN-6. Same el
/9/
Subminiature,
cludes asst. zeners
rectifiera. It's mixed
9 -DIGIT
READOUT
-
/q.
1
ll4yinDO7's,
100 for $1.98
GAS DISCHARGE
form any other DCM on the market today. More feanot incandescent..
tures than eve before! Not g
not nixie but the modem LED..Choose from such famous
anuiacturera
s Monsanto's MAN-t, MAN-4, Litronics
707 and 704, ODCOa'a SLA-1 (the last 4 having eharacter heights of 0.33 at n
Ira charge). Each kit is.
FREE edge
dudes .152" D.c board with fingers for
connector, aide-mounting !dip socket, LED readout of
tors, 3 IC's,
d Molex connector.
Your choice,
(this ELIMINATES SOLDERING YOUR IC'ni and
FREES
booklet. INCLUDES P.C. EDGE CONNECTOR
Pin -for -pin MAN -4, elec. char.
Pin -for -pin MAY -1.
Same as above except uses MAN -6....$9.95
character Slum
watts,
By
"Digital Counting Modules" outper-
YAM -1 .2T h. Monsanto
MAN -4
MOnunt4
707 33 h Litronins
2
54.95
Xerox)
LED MITY DIGIT "DCM'S"
1o.
/a.
BARREL KIT r12
ZENER- RECTIFIER MIX
Marked and unmarked,
_facternal numbers of
ory stock.
op and industrialt lighting
home, shop
gads electrical
TEST 'EM
YOURSELF
AND SAVE!
LM1458(DI 69
2.50
LM370
LM371
LM373
LM374
LM376
LM377
LM380-8
LM380
LM381
LM382
LM531
LM532
LM533
LM555
LM558(D)
LM560
LM561
LM562
LM565
28 to 40 pin devices,
marked,
internal factory
numbers, etc
1
7400 DIPS
very elaborate circuit for controlling
rated electric
Easily controls
vril electronic devices.
1100
etc. r16im r
drips, brush type motors,
in
speed or dimming control
With
3 x 23/4 x 2. With diagram
case.
aluminum
-duty
heavy
and hookups.
LM340*
LM341-T*
LM350
Marked and unmarked
i
rl7
i
Marked and unmarked. Red
case type asst. values.
that controls
that
Corning Glass.
pin dip paks.
100 for $1.98
100 for $1.98
All 4 leaders TO -18 case.
includes UHF transistors
too!
I./
200 for $1.98
By
KIT
marked
Babcock, Leach, etc. All types.
and unmarked stock.
2.65
LM566
2.85
LM567
.49
LM702
.41
LM703
.41
LM703M
.25
LM709
LM710
-29
LM711
-29
.61
LM723
1.75
LM733
.31
LM741
.31
LM741CV
.69
LM747 ( D)
.35
LM748
1.79
LM753
.79
LM1303
1.00
LM1304
.79
LM1307
.29
,69
.79
,89
1.05
1.05
1.50
1.10
.99
1.75
1.19
LM320*
1.25
LM322
1.75
LM324 (Q) 1.85
(Q)
LM339
1.45
oice
Raw fallout stock,
S tim
(D1 = Duals: (Q) = 124
Quad.
Sale
$ .69
LM300
LM301
LM302
LM304
LM305
LM308
LM309H
LM309K
LM330
LM311
LM318
LM319
30 for $1.98
BARREL RIT rig
PRECISION RESISTORS
BARREL KIT r13
RESISTOR NETWORKS
LINEAR
DISC CAPACITORS
30 for $1.98
am
a
40 for $1.98
type
PNP, plastic 11)220
Assorted 2N numbers.
plastic TO220
um r type.
Assorted 2N numbers.
2
Type
5748
I
Choices of Case St Yes
State Voltages
I
of any kit
loo
CODE
LINEAR
40 for $1.98
30 for$1.98
Amazing, Includes 456kcs, All stud types, asst,
osc, antenna, who knows?
m transistor radio man- peragea and voltages,
.'
c
Take
NATIONAL
SIGNETICS
BARREL KIT
BAR ER IT #10
BARREL KIT
SCRS. TRIALS
40 for $1.98
Singles, duals, variety of
values, styles, big ones
small ones,
TRANSISTORS
BARREL KIT
RELAYS!
40 for
$1.98
1N4000
400,
diodes at these prices!
BARREL KIT
BARREL KIT
BACRS, T MAC S,
QUADRACS
100 for $1.98
this before.
You never
Imagine famous switching
40 for $1.98
/\Your
25 BARRELS PURCHASED FOR THIS SALE!
BUY 'EM FROM THE "BARREL" AND SAVE!
May include 709'e, 741's,
703's, 660 series. 666 in-
cludes marked
marked. DIPS
s
,BARREI
Famous for...
9uy3-
RAYTHEON -RCA
For the first time anywhere, Poly Pak
merchandisers introduce a new way
in buying the economical way. Raw
stock from the "barrel ". Remember
the "good ole days"? They're back
again. The same way merchandisers
throughout the United States buy
from various factories ... their overruns in barrels. Poly Pak has done
the same. Therefore you are getting
the same type of material as the
RE- TESTERS DO!
3.95
MINIMUM ORDER
POLY
-
$4.00
PAKGFr
P.O. BOX s42R. LYNNFIELD,MASS. es 540
89
- IMIMIMINIIIIII =IMIIMM IIIMIIMIIIINI'
T1980 D /A. X -Y analog output with Z -axis
control. Price: $385.00. Other interfaces.
RAY SPORLEDER, R.R. #5, Box 48, Bloom ington, IN 47401
HOLD -IT! A new precision electronic pro-
SURPRISE! Build inexpensively, the most
unusual test instruments, futuristic gadgets
using numerical readouts! Catalogue free!
GBS, Box 100B, Greenbank, WV 24944
duct. Details free. INNOVATIVE CONCEPTS, 4018 Clarke, Ft. Worth, TX 76107
SOLDERS
PRINTED CIRCUIT
DESOLDERS
5K, 10K, 25K, 50K, 100K
$.75 ea.
3/$2.00
MULTI-TURN TRIM POTS
Similar to Boums 3010 style, 3(,"
x 5/a" x 11 /4 "; 50, 100, 2000, 5000
ohms
$1.50
LIGHT ACTIVATED SCR's
TO -18, 200V lA
$1.75
PRINTED CIRCUIT BOARD
41/2" x 61/2" single sided epoxy
board, 'fl" thick, unetched
$.50 ea.
5/$2.20
MC14435 & MC1405L
A two piece 31/2 digit A/D converter system for panel meters
and DVM's. Schematic for low cost
DVM included.
$39.95
2N3820
TIS 73
P
N
$.60
FET
$.50
$.50
FET
2N4891 U1T
4/$1.00
ER900 TRIGGER DIODES
$.75
2N6028 PROG. UJT
"
VERIPAX PC BOARD
single sided
This board is a y
paper epoxy board, 41/2 "x61/2 ",
DRILLED and ETCHED which
will hold up to 21 single 14
pin IC's or 8, 16 or LSI DIP
IC's with busses for power
$5.25
supply connector.
catalog. IC's, Semi's. CORONET
ELECTRONICS, 649A Notre Dame W., Montreal, Que., Canada, H3C-1H8. US Inquiries.
RADIO & TV tubes 36c each. One -year guarantee. Plus many unusual electronic bargains. Free catalog. CORNELL, 4217 -E University, San Diego, CA 92105
RED /GREEN BIPOLAR LED
$1.30
MT -2 PHOTO TRANS
GREEN OR YELLOW LED
$ .60
RED GAP OSL -3 LED
$
$
2N404 PNP GE TO-5
2N3919 NPN Si TO-3
$1.98
FPA 711 -7 LEVEL Diode
$5.95
Elastometer low
profile calculator keyboard. A
23/4" X 31/4" X 1/2" flex key.
195K -6 keyboard having 0 -9,,
-,
-----------
74L007400
100
.06
.14
.30
.80
200
400
600
800
1000
.07
.09
.20
.35
1.15
.25
.50
1.40
7430
.70
.90
1.10
1.80
.15
.20
.35
.45
$.75 EA.
EA.
REGULATED MODULAR
POWER SUPPLIES
+ -15VDC AT 100ma
$24.95
115VAC INPUT
5VDC AT 1A, 115VAC INPUT $19.95
$24.95
12V .6A
IN 4148 (IN914) __
1103 1024 bit RAM
NEC 6003 2048 bit RAM
1101 256 bit RAM
8223 PROM
7489 RAM
14/$1.00
$4.75
$9.50
$1.75
$4.75
$2.75
Terms: FOB Cambridge Mass. Send
Check or Money Order. Include
Postage. Minimum Order $5.00.
COD's $20.00.
$
74C10
74C157
74C165
CD4001
CD4002
CD4006
CD4007
CD4009
CD4010
CD4011
CD4012
CD4013
CD4015
CD4016
CD4017
$
.30
.14
.17
.14
.17
.21
.20
.35
.37
.18
.17
.27
.45
.72
.37
.37
.17
.36
.27
.31
.17
27
.36
.35
.17
.95
.90
7432743774387440744174427445 -1.05
7446 -1.10
7447-1.00
7448-1.00
7472- .33
7473- .38
7474- .35
7475- .60
8038C IC VOLT
747674807483-
.45
.60
.80
7485 -1.10
7486- .40
7490- .60
7491 -1.00
7492- .75
7493- .60
7495- .80
7496- .85
8267 -1.95
74107- .40
74121- .50
74123- .90
74125- .65
74126- .70
74150- .99
74151- .84
74153 -1.05
74154-1.49
74155 -1.05
74157 -1.17
74163 -1.45
75164 -1.75
74165 -1.75
74173-1.55
74175 -1.60
74177 -1.50
74181 -3.00
74192 -1.40
74193 -1.28
74195- .80
74196 -1.85
75491 -1.10
$4.50
CONT. OSC
5311, 5314 or 5316
CLOCK CHIPS
ea. $6.75
CT7001 CALENDAR ALARM
$9.95
CLOCK CHIP
10 PIN TO -5 TEFLON
$ .60
PC SOCKETS
ST;j
4
ilo
O
IFG0"
V
i
_
CHECK OUT OUR FLYER, YOU WON'T
REGRET IT.
THE
CIRCLE
BINGO
CARD AND WE'LL DO THE REST.
,
timing crysvoltage
tal,
converter
driving
I
S.
(((jjj
__I
ave
1:;1:1314/E
for
LCD
dis-
.wo
0
plays, powercell, misc.
parts, trimmer cap, + more.$
Many useful parts for
'
$1.25
$ .30
$1.00
$ .30
$1.67
$1.20
$1.09
$1.42
$ .30
$1.42
$ .84
I
I
,1
/1.I1.I= IM IM
IMIM IM IM IM IM I,
*6§
I
=I111 =II
MINICOMPUTER
BASIC CHIP SET
8- 2102s, -8008
1
1
ANOTHER
FIRST:
- I 11 111 =1
SERVICE
ETC. CALL OR WRITE--
PROM PROGRAMMING
FOR 1702 -5202 -5203
=)411!
:CHEAP
$ .58
$2.70
Full Wave Bridges
PRV 2A
6A 25A
200 .95 1.25 4.00
400 1.15 1.50 5.00
600 1.35 1.75 6.00
$9.95
6 DIGITS, BOARD, PARTS, &
LENS. LESS CASE & XFRMER
I
Items shipped PPD; orders under $10 add
50¢. Cal res add tax. Call (415) 357 No CODs.
7007 for Mastercharge or BAC.
fiI IIM IM IM
1M1 I.111M IM IM IIM IMI IM
Circle 79 on reader service card
SCANNING CHARGED COUPLED
$150.00
DEVISE, WITH DATA
SANKEN AUDIO POWER AMPS
$ 6.40
G 10 WATTS
$13.95
G 20 WATTS
$24.95
G 50 WATTS
1010
Si 1020
Si 1050
Si
LINEAR CIRCUITS
lA
LM 309K 5V
-40 +40V
723
REGULATOR
REGULATOR
Op. Amp.
$1.50
..
$ .58
301/748 -Hi Per.
S
LM 320
$1.75
-5 or -15 V REG.
-V
5 .58
$ .31
POS. REG. TO -220
101 OPER. AMP. HI PERFORM
$1.75
537- PRECISION
OP. AMP.
LM 3900 -QUAD OP. AMP.
LM 324-QUAD 741
560 -PHASE LOCK LOOP
561 -PHASE LOCK LOOP
565-PHASE LOCK LOOP
556 FUNCTION GEN.
567 -TONE DECODER
703 -RF -IF AMP.
LM370 -AGC SQUELCH AMP
$2.60
HR. TIMER
us
555
553 QUAD TIMER
FCD 810 OPTO- ISOLATOR
1456 OP. AMP.
1458 DUAL OP. AMP
LM 380-2W AUDIO AMP.
LM 377 -2W Stereo Audio Amp
LM 381 -STEREO PREAMP
LM 382-DUAL AUDIO PREAMP
PER. COMPARATOR
LM 311
LM 319-Dual Hi Speed Comp.
s
$ .25
5 .75
LM 308 Oper. Amp., Low Power $1.05
$ .75
747 -DUAL 741.
$1.30
556 -DUAL TIMER
-2
-HI
LM 339 -QUAD COMPARATOR
TRIACS
PRV
100
200
lA l0A 25A
.40 .70 1.30
.70 1.10 1.75
400 1.10 1.60 2.60
600 1.70 2.30 3.00
.49
$
$2.20
$2.50
$2.50
52.50
$2.50
$2.85
.41
$
$1.15
88
$3.50
$1.35
5 .95
.65
S
$1.39
$2.50
$1.69
$1.69
5 .95
$1.15
$1.45
SCR'S
1.5A 6A 35A
.50 1.20
.60 .70 1.60
1.00 1.20 2.20
.40
3.00
for our catalog featuring
Transistors and Rectifiers
Send 20c
145 Hampshire St., Cambridge, Mass.
WE SHIP OVER
TEL. 617 547 -4005
LISTEN TO
spectaada
.30
to 37V POS REG.
LM 376
741A or 741C OP. AMP.
709C OPER. AMP.
3401.5, 12, 15, 18, 24V
-2
1
$2.50
$3.10
256 XI BIT SELF
CD 110 LINEAR
Na GODBOUT ELECTRONICS
Box 2355, OAKLAND AIRPORT, CA 94614
CD4019 $ .58
CD4022
CD4023
CD4024
CD4025
CD4026
CD4027
CD4028
CD4029
CD4030
CD4035
CD4042
CD4046
CD4047
CD4050
CD4055
CHARACTER GEN.
P.O. BOX 740
SOMERVILLE, MASS. 02143
.55
.60
$2.15
$3.50
$ .30
$ .30
$1.50
$ .30
$ .67
$ .65
$ .30
$ .30
$ .53
$1.17
$ .65
$1.35
2516-64x6x8
SOLID STATE SALES
4$,
74CO2
,
TTLIC SERIES
Silicon Power Rectifiers
12A
50A
lA
3A
.30
.70
Tape Readers
X,
=, K +C buttons
$6.00
with off, on switch.
PRV
.11
Array
Conductive
100/$1.00
1000/$8.00
$.40
$
5/$1.00
CD201 100x100 IMAGE SENSOR
CHARGED COUPLE DEVICES
USED IN SOLID STATE CAMERAS, WITH APPLICATIONS.
.20
.40
$ .50
10 WATT ZENERS
OR 18V
1. WATT ZENERS 5.6,
10, 12, 15, 18, OR 22V
3/$1.00
/MOS (DIODE CLAMPED)
CAPACITORS
DO -33 -A 3 DIG. LED
35V at .47 of TANT 5 /$1.00 ARRAY READOUT $1.95
35V at 6.8 of TANT 3/$1.00 MAN -1, Red or Yellow
20V at 150 of TANT ..5 .40 LED READOUT
52.50
6V 30 of TANT
5 /$1.00 MAN -3 READOUT $1.75
12V 200 of ELEC
$ .30 MAN -4 READOUT $2.00
200V 4.7 of ELECT
$ .30 SLA 3
$4.50
$ .30
3.9, 4.7
$1.50
2N3055 NPN Si TO-3
$1.00
2N3904 NPN Si 70-92
4/$1.00
2N3906 PNP Si TO-92
4/$1.00
2N5296 NPN Si TO-220
$ .50
2N6109 PNP Si TO-220
$ .55
2N3866 NPN Si TO-5 Si RF POWER $ .75
M12252 NPN Si TO.66
$ .90
2N3638 NPN Si TO-5
5/$1.00
2N6517 NPN TO-92 Si
3/$1.00
7401
7402
7403
7404
7405
7406
7407
7408
7410
7411
7412
7413
7416
7417
7420
7425
7426
7427
14 PIN DIP SOCKETS
16 PIN DIP SOCKETS
MOLEX PINS
C
4/$1.00
RF
MPSA13 NPN Si TO-92
2N3767 NPN Si TO-66
2N2222 NPN Si TO-18
+,
`I
but
FREE
TRANSISTOR SPECIALS
2N1546 PNP GE 10-3
$ .95
2N5086 PNP Si TO-92
4/$1.00
2N4898 PNP 10.66
$ .60
Optical
readout;
and
EXCELLENT FOR P.C. WORK
QUICK cash for your used Altair 8800, TV
Typewriter, interfaces, software, etc. Contact us for service, parts, and free applications information. ALCOVE, 230 Main, North
Reading, MA 01864 (617) 664 -4271
$24.00
$24.00
IC
I
RESOLDERS
Type A %" dia., 6 -32 threads
$1.98
Type F 3Ça' dia., Plug Type Tip
2.13
Type H %" dia., Plug Type Tip
2.28
GUNMASTER, Box 743, Kings Park, N.Y. 11754
833 BALRA DR., EL CERRITO,CA. 94530
reject
y
TRUMBULL
5202A UV PROM
MM5203 UV PROM
MINIATURE TRIM POTS
These
I watch guts
. lack the
SOLDERING IRON USERS
NEW! SAME SOLDER TIP
EPDXY GLASS CIRCUIT BOARD STOCK;
CARBIDE DRILL BITS; TAPE RESIST;
ARTWORK; BUBBLE ETCHERS
SEND S.A.S.E. FOR FLYER
INTEL 8008 8 BIT MICRO PROCESSING CHIP (with data book) $49.50
2102 -2 1024 BIT RAM
$ 6.95
`HOBBYIST SPECIAL''
I
95 °°
4Chanuel Sound!
Vista SQ Decoder
Exclusive
CBS Licensed
IC's FOR
SUPERB FIDELITY AND
CHANNEL SEPARATION
WITH FULL LOGIC AND
WAVE MATCHING
FIXED BLEND
KIT SQ -1
4000
VARIABLE BLEND
KIT SQ -3
$5500
All Parts Except Case and Power Supply.
+20V 75mA IC Regulated Power Supply
Kit Available. Only $5.00 when ordered
with a decoder kit.
Shipped prepaid in USA
NY State add Tax
$2.00 additional for CANADA
OF OUR ORDERS THE
PHOTOLUME CORPORATION
0.10( WE RECEIVE THEM
118 East 28th STREET. New York, N.Y. 10016
Circle 88 on reader service card
www.americanradiohistory.com
,
-
POLY
PA K S
SMASHES `CALCULATOR' PRICE:
AM TUNER
,nom.
LOWEST PRICES IN U.S.A.!
LIMITED TIME OFFER
WITH BUILT -IN AMP
Slide -Rule Dial Covers
(10 -watts Peak Power)
ALL SOLID STATE!!!
9- FUNCTION, 8- DIIáIT
MEMORY CALCULATOR
KIT
Money -Back
For the Audiophiles who are seeking an economy hi -fi GUARANTEE
AM only at our give-away price! Never advertised on all Items
before. Same quality and construction as our 20W to
$9.95
$19.95
It's the easiest multi -function
60W units. Features: 4 controls; Tuning, Tone, ON /OFF
Volume, Circuit Switch (AM- phono). 2- Speaker stereo
effect system. 6 -ft. power cord. Phono cables, with
ycles. No escutcheon. Size:
hookups. 115 VAC,
105/8 x 55/8 x 3i/z" deep. Wt. 3 lbs.
Never before have we ever seen such a combination of
AM and FM with built -in high quality at such a low
price. A "natural" for the economy- minded Audiophile.
Features: Tuning Tone, ON /OFF Volume, Balance, Circuit Switch (AM, FM, FM -AFC, phono). 2- Speaker
stereo effect system. 6 -ft. power cord. Phono cables,
with hook -ups. 115 VAC, 60 cycles. No escutcheon.
x 3t/," deep. Wt. 3 lbs.
Size: 13 x
DOUBLE MEMORY
Percent, Constant,
Display Restore
95
A
FM
,
BUY ANY 10
TAKE 15%
SN7400 $.16
SN7401
SN7402
SN7403
SN7404
SN7405
SN7406
SN7407
SN7408
SN7409
SN7410
SN741
SN741
1
3
SN7414
SN7416
.16
.16
.16
.19
.19
.35
.35
.19
.19
.16
.25
.59
1.65
.34
.34
.16
SN741 7
SN742C
SN7412
.45
.29
.29
.25
.29
.16
.25
.49
D SN7423
SN7425
SN7426
5N7427
SN7430
SN7432
SN7433
SN7437
SN7438
SN7440
SN7441
.34
.34
.16
1.00
.70
SN7442
SN7444 1.25
SN7445
.89
.1 5
SN7446
.99
SN7447
SN7448
.99
.16
SN7450
1
SN7451
SN7452
SN7453
SN7454
SN7455
SN7460
SN7471
.49
.29
SN7472
.36
SN7473
.36
SN7474
.59
SN7475
SN7476
.39
.79
SN7478
.52
SN7480
.99
SN7481
.89
SN7482
SN7483 1.25
SN7485 1.25
SN7486 .37
SN7488 3.95
5N7489 2.45
.59
SN7490
SN7491 1.10
.59
SN7492
.59
SN7493
SN7494
.95
.79
SN7495
SN7496
.79
SN741 00 1.40
SN 741 04 .44
0 SN74105 .44
SN74106 .52
SN74107 .44
SN741 08 .89
SN74112 .89
SN74113 .89
SN74114 .89
SN741 21 .49
.17
.17
.17
.17
.22
.17
D
0
, 6-VOLT
OWER PAK
D
"A" cell nicad
batteries hooked up to give
you 6-volta for all types of
energy uses. The best batteries made. Rechargeable.
Includes
4
(requires
little
displayy restore key
The
consery batttttmdisplay on panel shuts te
off 25 seconds
operation. By depressing
Mte. the last
D"
'
stored! Uses 6 N cell batteries. key, the t replay is
Red decrms I appears
on left to show when
hatteries need
repla . mentt,
Per
key
e
bluenc
fpocket
pocket s size 5t/q d, whtad
Lightweight.
3 x (2" at back
ront
side) x 1 "
of angular display
panel
black c
:t for business school, home,
Nifty
Slips into any pocket, briefcaseand for the youngster..
with ease.
understand pictural instruction
-to.
booklet and Easy
use-book.
how-toKIT INCLUDES: case,
ON-OF!
switch (part of keyboard)22 -key keyboard skit.
PC board, driver sync
calculator chips, 9 -digit 'bubble"
ry
magnifier Ly memory'
array cable, AC adapter jack
array,
& wires, battery Ilease
battery card display, instruction
f,
and
.stçn
Pictural step -tynstruction booklet.
ie
Aaritmeic
thta
.
SN741 22 .48
SN741 23 .85
SN741 25 .59
Û SN74126 .59
SN74132 1.75
5N 741 40 2.10
SN74145 1.05
5N74148 2.25
SN74150 .98
5N741 51 .75
SN74153 .90
Û5N74154 1.35
DSN74155 .95
Û SN74156 .95
5N7415 .95
ÛSN74158 .95
5N 741 60 1.35
SN74161 1.25
ÛSN74163 1.35
5N74164 1.50
SN74165 1.50
SN74166 1.50
SN74173 1.45
5N74174 1.39
ÛSN74175 1.30
Û5N74176 1.20
SN74177 1.20
O 5N74180 .95
SN74181 2.98
SN74182 .74
SN74184 1.98
SN74185 1.98
SN74190 1.40
SN74191 1.40
SN74192 1.25
SN74193 1.25
SN74194 1.20
0 SN74195 .85
SN74196 1.80
SN74197 .90
SN74199 1.75
SN74200 4.95
$4-,.'-
2* LETS!
EASY TO PUT TOGETHER!
You bet it ..s
no resistors,
Sine
NO/LURES
CHIPS
a
READOUT! How's that forsittup
2 Memory keys are
MS Memory Storage and The
MR
side
BUY 100
TAKE 25%
SN7462 $.22
.29
SN7470
kit today!
-Arithmetic
Fanction
CD4000AE $.29
CD4001 AE
CD4002AE
Û CD4006AE
.29
.29
8
BRITE
DIGITS
2.50
CD4007AE .29
CD4008AE
CD4009AE
CD4010AE
ÛCD4011AE
CD401 2AE
CD401 3AE
CD4014AE
CD4015AE
CD4016AE
CD401 7AE
CD4018AE
CD401 9AE
CD4020AE
CD4021AE
CD4022AE
C04023AE
CD4024AE
CD4025AE
CD4O26AE
CD4027AE
CD4O28AE
CD4029AE
CD4030AE
CD4033AE
CD4035AE
CD4040AE
CD4041AE
CD4042AE
CD4043AE
CD4044AE
CD4049AE
CD4050AE
pCD4051AE
CD4052AE
CD5053AE
CD4055AE
CD4056AE
CD4060AE
CD4066AE
CD4069AE
CD4071AE
CD4081AE
CD4518AE
CD4520AE
1.98
.59
.59
.29
.29
.69
1.98
1.98
.69
1.75
1.98
.69
1.98
1.98
1.70
.29
1.50
.34
3.95
.85
1.65
2.90
.65
3.95
1.85
2.45
1.90
1.90
1.50
1.50
.79
.79
2.98
2.98
2.98
2.75
2.50
3.25
1.75
.45
.45
.45
3.10
3.10
THE SIMPLEST! FINEST!
SMALLE!,T!
6- FUNCTION AC -DC
CALCULATOR KIT!
95
Lightweight, pocket size
Extra large display
8 functions plus, minus,
times, percentage, constant
Floating decimal
Chain and Mix calculations
Simplified indexing
Mark
and Mark down
Constan t multiplication
and division
AC adaptor jack
Designed specifically
80 brand. aIMAGINE! for Poly Paks under tee ),alios,
my 2t/z o 1 x 4l/z ". Std.
to your vest pocket,
ea It
brief c
hunted
heo.ibet. ee
to find
calculator kir th
Ian do the
can
y functions
design
lh fine engiceeei"
des'
d SIMPLE TO BUILD!
WHY' Beeaeae :t has
e kit. Imagine the pc bray! only
has the ,chip.:
.a
tocs,
two
transstnra,
with the 9 driest' readout.
a.be
SIMPLE! You bet l tar
The entire kit
m If
tovel idesigned box ha packed
tt(recitself
tself tells the -I r eel-.
r
includes:
te
active
black
flit
FI
rt d
Key (typa 20Sµ -66
lA k
k
only 2./
with
n
2
itchy onele fo- that
OFF
for
constant: MAIN
pc eoard,; n c
board, famous K
Cal Tech 5030 26-pin
) two 75491 'c driven;
pin
lc
:.hip:
;-/
c jack; 9 Volt battery
9 d:Fil
digit
ray;
connector resistors:
.istors hack
peu +
protective
e mate: necessary
j env nstrnrtin
(Less 9 "i[ standard dater.
AC
,
ë
H
MII
L7Ger
000
[BOON
:
OO
\
/
i'
14401.
l"
-
"
pf l'
j
_/
-
Case
Pe beard,
;
...._.
-
sv'
"d""'"' EASIEST KIT
TO BOIL[
-
WHIZZER CONE HIGH COMPLIANCE SPEAKERS
For hi -fi applications.
For car and home stereo
$9.95
$4.50
8" 25 WATT
8" 10 WATT
PM SPEAKER
Excellent for our radio
One of the finest speakers
made, Used extensively with
hi quality stereo and 4
speaker systems. Hi- efficiency, hi- quality, 40 to 18,000
cycles. Excellent fidelity. 12
on.
'amie magnet, to 8
coil.
ohm
cha-
Wiand AM -FM tuner amps.
hizzer
hi
freq.
cone ". Has 5 -oz. Ceramic
magnet. 8 -ohm voice nil.
th
SANKEN HYBRID AUDIO POWER AMPS
Sanken Watts Sale
All amptinrs, flat wIthin r/z db from SI-10100
10 $ 8.88
he to 100,000. Each unit properly heat- sinked, with SI -10200 20
14.95
heavy -duty connecting tie lug connections. Single- SI-10300 30
18.98
24VDC.
required
Powersupply
output.
ended pushpull
50
29.95
S1 -1050G
Output to 8 ohms. Order by Stock No.
Low Prices
"QUAD/'
On
Calculator
TAPE DECK
5001
5002
CT
CT
5030
5031
sous
TM5 -e12s
BY TELEDYNE
PACKARD -BELL
MM
MM
MM
or
Use for either -track r
The "QUADS ".economy
exclusive
JUST IN
tope
tape
expensive
Quad tapes. An audiophile
most
they
in
t
Paks. Same type found complete
to
cables necessary
tiring
preamp
even
toying 4 tchanneletc.
quad amplifier or elsewhere
stereo
ou
into
any
(see
just plug
tuner amplifier ridterrlto
on deck.
at h 6
cartridge
stereo
catalog). Insert
non-repeat
this catalog).
notes of non-stop,automatically
shuts
Enjoy up to
deck aromatically
autolights, autoor quad. Remove cartridge
4-program indicator
Other features:
push-button enables
program
witch.
swi h that
matic
triggering
ally
quad Cafes; nable'selector
use 8-track
flanYou to automatically
WOW & FLUTTER PROOF
8
.
1
t
CHIPS
CT
CT
CT
panel
flywheel for
door mounting front pe
115
Includes
Heavy duty cool-proof
electronics.
Val
for
x
VDC supply,
sche
Size: fit/zx e' /z
all
schematic,
31/0',. IT'S READY TO GOcables.
ping
Ping front panel tape
5725
5736
5738
12- Digits, 40 pin
9 -Volt version of 5001
12- Digit., 2s -pin,
with 3- function memory
4- Function with ^e
4- Function Only
9- Function by Texas
8-Digits. 4- font. LED
6- Digits, 26 -pin, 9V
a- Vigile, scanty.
05 5 5 Timer POSTAGE
OR
0558
2
°41
for $1
Sa!, ,Qo,:I rill
Sep. 15
1975
1
STAMP
MOBILE
MIKE
SPKR
his unit is not advertised
anywhere! Made for
111
Motorola Communications at
the original cost of $4.50
each (for insertion in their
g8
o$1.9
too, covering broad range
Extremely wellIn sound.
01111
N
Walkie Talkie Program).
It's a 60 -ohm imp MIKE.
It's an excellent speaker
Circle 86 on reader service card
www.americanradiohistory.com
33.99 3 for S 9.
3.95 3 for 59
3.90 3 fer S S
6.50
6.50
3.50
3.50
3.50
6.50
3 for
3 for
3 for
3 for
3 for
3 for
Ste.
Ste.
S9
S9.
S
Se
Red
iColor
Fits Into 14 -pin
*
IC
3 TO 5 DIGIT
INSTRUM ENT
READOUTS
sockets
3V N 10 rolls per segment.
Sale
Size Digits $1.75
Type
2.98
3
.08G
DL -33
5082 -5
r 56.
It r 57.
a fc
2.49
4
5
.11
built -on magnifier.
5082-4
C-With
S,.1101
aftrs5.
.11
1
Terms: add postage Rated: net :10
Phone Orders: Wakefield. Mass. (017 2-1, 8299
Del Carmine St., Wakefield, 91 v,
Retail: t
loft atee Street C.O.D.'S AY BE PIIN. is
20c CATALOG on Fiber Optics, 'ICs', Seeu's 'arts
MINIMUM ORDER
$4.00
I
-
POLY PAIO1
P.O. BOX 942R. LYNNFIELD, MASS.. o
A:10
91
2102 2
MOS 1024 BIT
7400
74H00
7401
74H01
7402
7403
FULLY DECODED STATIC RANDOM ACCESS MEMORY
DIRECTLY TTL COMPATIBLE INPUTS AND OUTPUT
SINGLE 5V SUPPLY
- NO CLOCKS OR REFRESH
6695
64995
Eil. (DIP)8 FUR
SPECIAL
Numeric Display
1/4" Single Digit
8223
PROM
GaAsP LED
COMMON
CATHODE WITH RH
SUPER SPECIAL $.75
TEN for
$5.95
32 WORD
MEMORY
*3.00 EA
- $29
10
WE
FOR
CD -2 COUNTER
BIT
8
PROGRAM
#5 EACH
KIT
Unit includes board, 7490, 7475, quad
latch, 7447 seven -segment driver, and
RCA DR2010.
;App9 p475
IMP n
446
--c
-o.
COMPLETE KIT only $11.95; FULLY- ASSEMBLED $15.00; boards can be supplied
separately at $2.50 per digit.
Numitron Digital Display Tube, incandescent 5 -volt 7- segment:
.6" High numeral visible from 30 ft
Standard 9 -pin base (solderable)
Left -hand decimal point
EACH $5.00
5 FOR $20.00
CD4000
CD4001
CD4002
CD4007
CD4008
CD4009
CD4010
CD4011
CD4012
CD4013
CD4015
74L54
74L55
7460
74L71
7472
74L72
7473
74L73
7474
74H74
7475
7476
74L78
7480
7483
7489
7490
7492
7493
7495
74L95
74107
74145
74180
74193
74195
TRANSISTOR
C10 5
$.55
.45
.45
1.00
3.25
.75
.75
.45
.45
1.00
3.00
CD4016
CD4019
CD4023
CD4024
CD4025
CD4027
CD4030
74C20
74C42
74C157
74C161
74C195
1.00
SPECIAL
1.00
.45 2N3568- HEP736
1.60 1092 PLASTIC
.45 NPN 300MW
1.00 60V 40 -1208
$.15
EACH
1.00
TEN
1.00
.65
100
9.00
2.00 1000
80.00
2.50
NEW -TELEDYNE
3.00
MARKED T3568
2.00
POTTER
BRUMFIELD
Type KHP Relay
4 PDT
24 VDC
120 VAC
3A Contacts
(650 coil)
(10.5 MA coil)
SEND FOR
FREE FLYER!
74H04
7405
7406
7408
7400
7410
7413
7417
7420
74L20
74H20
74H22
7430
74H30
74L30
7440
74H40
7442
1.00
7447 1.50
7450
.20
74H50 .30
7451
74H51
7453
7454
RCA 2010
C
.20
.25
.20
.25
.25
.25
.25
.30
.30
.40
.30
.20
.20
.75
.40
.20
.30
.30
.30
.20
.30
.30
.20
.30
7404
ií
DECIMAL
Compact -10 digits in 3" panel width ACTUAL SIZE
Highly legible- bright red 1/4" character easily
read within 10 feet over a wide viewing angle
125 mW per digit at typical brightness
$1.50 EA.
.20
.25
.20
.20
.25
.25
.16
.25
.40
.60
.35
.75
.45
.75
.80
.55
.70
.50
.70
ELECTROflICS
.65
1.00
$10.00
Rejects and require repairs
but most easily repaired. Desk
top models. We furnish 32
page instruction and trouble
shooting. 8 digit 4 function.
Two models available.
model #SP102A
$10 each; 3 for $26.50
Btry. model #SP102B
$11 each; 3 for $30.00
AC
I_I
II
II II II
IIIII_II_IIIIII_II_II_II_II_/II
I
I
I
.65
.80
.
.
.
.
I
I
o
#PANAPLEX $6.00
HI- VOLTAGE (NEON) DRIVER PACKAGE
Package of 3 IC units for interfacing of high
voltage neon type displays with low voltage calculator chips. This set of three IC's consists of
Cathode Driver IC, Anode Driver IC, and Level
Shifter IC. We include data for use. Good with
Panaplex displays, Sperry displays, Anaplex displays, etc. From what we can see, no one seems
to have them and this is the first time offered at surplus prices. They are first
line devices, surplus due to a manufacturer of keyboard displays going out
of business.
#DION $6.00
MOS ASCII ENCODER CHIP
With all the interest in keyboard encoders, TV readouts, etc. this single chip
ASCII encoder should be welcome news. And the price...unbelievable at $9.95.
40 pin DIP, made by MOS Technology. Data sheets enclosed with each order.
#SP-105 $9.95; 3 for $25
Please add shipping cost on above.
SURPLUS ELECTRONIC MATERIAL
19 ALLERTON ST., E. LYNN, MASS. 01904
P.O. Box 62
Circle 83 on reader service card
TRIPLE
REGULATOR
..
°'
STOCK NO.R9013
as
-
.t
loaded
i
a
36V
t
,',
"''
BOARD
-
r/
'f
..
'r
"ra
t
.
'r
`,
,,i.
r
.
"-
(!,
.
I
r
..-.e
f
7'
Sophisticated parts board
POWER
@
@
@
_,,'
.
la
-
90V
70V
tracking
a
PARTS
ya
te1.4
with exotic parts. 6
741 op amps., 4 dip'
ped tantalum caps.,
multi turn trimpot,
`a
'
20 transistors, including r+
I
complimentary 2N3904
-'e
&2N3906, plus about
100
watt resistors,
STOCK NO.R9327
and
regulator,O to 5
volts @ 500 ma.
Regulation is 0.5%
for all regulators.
We supply circuit
diagram and data
sheet
a
5'/ "x3 %"
$5.95 ea. 2/10.00
Triple voltage regulator,
SOPHISTICATED
is
This board has 3
regu lators, +12.
volts @ 200 ma.,
e
''
}
This board
BOARD
-
'
916 334 2161
I
I
PANAPLEX 12 DIGIT DISPLAY
diodes and zeners.
C.O.D. PHONE ORDERS
ACCEPTED --$10 MINIMUM
I
12 digit neon (180 volts) display. Genuine Burroughs Panaplex II cold cathode
gas discharge 7 segments. Unused and we include the special socket. Measures
3s/e x z/e (pic shown is full size). Data sheet included. Good for clocks, timers,
counters, any type of digital readout use. Readability at 15 feet.
.50
1.25
1.00
1.50
I
I
I
1.00
$1.75 EA.
95841
CALCULATOR
3.00
1.00
All IC's new and fully tested, leads plated
with gold or solder. Orders for $5.00 or more
are shipped prepaid, smaller orders --add
55C.
California residents add Sales Tax
IC's
shipped within 24 hours.
P.O. BOX 41727
SACRAMENTO, CA
BragYLOn
LIQUID CRYSTAL
TTL DIP
MEMORY
$2.00
ea.
3/5.00
TRANSFORMERS
2A.ct., [email protected] 1.5A 8Yslb. Stk. R9315 9.95 2/19.00
1.5A ct., 6V @ .5A 5'Alb. Stk.R9314
6.50 2/12.00
1A.ct., 6.3V @ .2A 3Lb. Stk.R9313 3.50 2/6.00
Enclose sufficient postage. Excess will be refunded. Send
for our new catalog 14. 64 pages of electronic bargains.
e
DELTA ELECTRONICS CO.
Circle 75 on reader service card
Phone (617) 388 -4705
Circle 76 on reader service card
www.americanradiohistory.com
AM
INTERNATIONAL ELECTRONICS UNLIMITEI )
10% Off on orders over $25.00
15 %Off on orders over S100.00
20 %Off on orders over $250.00
TTL
7400
.19
S
7401
.19
7402
7403
7404
7405
7406
.19
.19
7407
7408
7409
7410
7411
.39
.25
.25
.19
.29
7413
7415
7416
7417
.49
.39
7420
.19
7422
7423
7425
.29
7426
7427
.29
.32
7430
7432
7437
7438
.22
.26
.39
.39
7440
7441
7442
7443
7444
7447
.19
1.09
.89
.89
.89
.99
.99
.89
7448
1.15
12
.22
.39
.39
.39
.32
.27
7445
7446
7450
7451
7453
7454
7460
7464
7465
7470
7472
7473
7474
7475
7476
7483
7485
7486
7489
7490
7491
7492
7493
7494
7495
7496
74100
74105
74107
74121
74122
74123
74125
74126
74141
74145
74150
$ .24
17
.27
.29
.19
.39
.39
.49
.36
.39
.39
.40
1.11
1.11
1.10
.44
2.75
.69
1.00
.79
.79
.89
.89
.89
1.50
.49
.49
.47
.47
.99
.60
.79
1.15
1.15
.95
74151
74153
74154
74155
74156
74157
74160
74161
74163
74164
74165
74166
74170
74173
74174
74175
74176
JULY SPECIALS
.89
1.29
1.25
1.19
1.29
1.29
1.58
MEMORY
1.39
1.59
1.89
1.89
1.65
2.95
1.65
1.80
1.85
$ .25
.25
.25
.25
.25
.25
.33
33
1.49
74151
$ .29
74155
74171
74172
74173
74174
74178
74185
74L86
.33
.25
.39
.49
.49
.79
1.25
.69
741190
741191
74193
74195
74198
741164
741165
74H01
74H04
74H08
741110
74H11
74H20
25
74H21
74H22
.25
.25
.25
.25
25
74H30
74H40
74H50
74H52
74H53
25
5
S
.25
.25
.25
.25
.25
.25
25
.59
.59
1.39
.89
1.59
2.19
2.59
3.49
8214
8220
8230
8520
8551
8552
8554
8810
1.69
1.69
2.59
1.29
1.65
2.49
2.49
39
1.14
.85
.85
1.00
3.65
.89
2.30
2.19
5.95
1.50
1.50
1.25
1.25
1.39
.89
.89
.99
1.25
.99
2.19
7.95
2.79
2.79
2.79
AE
AE
AE
AE
AE
AE
AE
4013 AE
$ .40
.40
.40
1.75
.40
2.45
.80
.80
.40
.80
4019 AE $2.10
4020 AE
2.20
4021 AE
2.05
4023 AE
.40
4024 AE 1.45
4025 AE
.40
4027 AE
1.20
4028 AE
1.75
4030 Al
.85
4042 AE
1.90
net
Set of 4 91915750 end
540.00 es.
or extended set)
1
$129.00
111195751
.99
-
11 digit
operation
3M
4
-
Ion, lion with memory
chain
54.95 ea.
DIG
PROCESSING UNIT
hit micro, amputer capability
fl
5002
5005
Same as 5001 exc btry pwr
12 DIG 4 funct w/mem
8 DIG 4 funO chain & dec
18 pin 6 DIG 4 runt
8 DIG 5 fund K & Mem
4
DIG 4 fund (btry sur)
pin BCD 6 dig mux
pin 1 pps BCD 4 dig mux
pin 1 pps BCD 6 dig mux
24 pin 6 dig mus
40 pin alarm 4 dig
28
24
28
Red TO 18
Axial leads
Jumbo Vis. Red (Red Dome)
Jumbo Vis. Red (Clear Dome)
Infra red diff. dome
Red 7 seq..270"
Red alpha num .32 "
Red 7 seq..190"
Green 7 seq..270"
.6" high solid seq.
seq..270"
Yellow 7 seq..270"
MANG
MAN64
7
.4" high solid seq.
.6" high spaced seq.
MAN66
7 seq..3"
Opto-isa transistor
DL707
MCT2
pin DIP
-$44.95
ea.
16
Red
S
MM
MM
MM
5013
5016
5058
SI 5 -4025
4066 AE $1.05
4068 AE
.40
4069 AE
.40
.40
.40
.40
.40
.40
.40
.40
4014 AE
4015 AE
500/512 bit dynamic
1024 bit static
Dual 64 bit static
4049 AE
4050 AE
2.10
2.10
74C00
6 .24
74CO2
.29
.49
.75
.39
.39
74C04
74C08
74C10
74C20
74C42
74C73
1024 bit accum. dynamic
.90
4528 AE
.90
4585 AE
74C74 $1.15
74C76
1.49
74C107 1.25
1.79
1.15
mDIP
mDIP
DIP
DIP
74C151
2.90
74C154
74C157
74C160
74C161
3.50
1.95
2.75
3.25
74C162
74C163
74C164
74C173
74C195
80C95
B0C97
Volt comp.
Tinter
Tone decoder
Quad amp
Dual per. drvr
355
567
3900
75453
$15.95
$24.95
mD1P
S.19
mDIP
mDIP
.79
.89
2.75
DIP
qP
.13
.10
mDIP
TO-5
mDIP TO-5
TO-5
TO-5
Pos V Reg (super 723)
Hi Perf Op Amp
301
302
304
Volt follower
Neg V Reg
305
Pos V Reg
307
308
309K
310
Op AMP (super 741)
Micro Pwr Op Amp
5V 1A regulator
V Follower Op Amp
Hi pert V Comp
Quad Comparator
Pos Volt Reg (5V-6V
8V- 12V- 15V- 18V -24V)
AGC /Squelch AMPL
AF -IF Strip detector
AM /FM/SSB Strip
370
372
373
376
377
380
380-8
Pos. V. Reg
2w Stereo amp
2w Audio Amp
.6w Audio Amp
Lo Noise Dual preamp
Lo Noise Dual preamp
Prec V Reg
381
382
550
555
560
562
565
566
.25
.20
.25
.25
.60
Timer
Phase Locked Loop
Phase Locked Loop
Phase Locked Loop
Function Gen
Tone Decoder
Operational AMPL
Hi Speed Volt Comp
Dual Difference Compar
567
709
710
2.50
4.95
2.15
2.95
4.95
1.35
3.95
3.50
4.65
2.15
.69
711
723
739
V Reg
741
Comp Op AMP
Dual 741 Op Amp
Freq Adj 741
FM Mulpx Stereo Demod
FM Mulpx Stereo Demod
Dual Comp Op Amp
Stereo multiplexer
Dual LM 211 V Comp
TV -FM Sound System
Dual Hi Perf Op Amp
747
748
1304
1307
1458
1800
1112111
3065
3075
1.60
2.40
Audio preamp
Quad Amplifier
Core Mem Sense AMPL
Core Mem Sense Amp
9 DIG Led Cath Drvr
Dual Perepheral Driver
Dual Peripheral Driver
(351) Dual Periph. Driver
Quad Seq Driver for LED
Hex Digit Driver
OPTO -ISO TRANS
MCT2
3.25
2.95
2.95
2.90
2.95
1.50
1,25
.59
.81
DIP
TO-3
DIP
DIP
DIP
1.2
TO -220
TO -5 or DIP
DIP
DIP
mDIP
DIP
DIP
mDIP
DIP
DIP
DIP
mDIP
DIP
DIP
DIP TO -5
mDIP TO -5
mDIP
TO -5 or DIP
DIP
1.7
1.2i
1.1 i
1.8f
1.61
i
1.1 i
.71
3.21
.51
2.61
1.21
1.2
161
1.61
71
91
27
27
26
2S
29
2
3'
2
DIP
DIP
6'
11.
DIP
mDIP TO -5
3'
DIP or TO -5
mDIP
3!
DIP
DIP
11!
.8:
6!
2.7!
1.8!
.6!
mDIP
DIP
DIP
DIP
FM Det -LMTR &
3900
7524
7534
8864
75451
75452
75453
75491
75492
$1.95
1.75
3.95
1.50
S .7 9
TO-5
71
mDIP TO-5
11
mDIP TO-5
.91
1.51
TO-3
TO-5 mDIP 1.11
mDIP TO-5 1.0i
Hi Speed Dual Comp
Neg Reg 5.2, 12, 15
Precision Timer
Quad Op Amp
319
320
322
324
339
3407
SHIFT REGISTERS
.99
.89
Hi perl amp
ID
300
3.95
4.95
5.95
2.25
4.95
5.95
5.95
4.95
4.45
4.95
4.95
5.95
9
Red
-
LINEAR CIRCUITS
$1.75
3.95
6.95
19.95
2.95
2.95
7.95
2.75
3.95
7.95
fund fix dec
12
MAN6
MAN7
x
4I"
LINEAR
101
bit RAM MOS
5001
MANS
.69
1.10
2.59
2.59
2.59
.29
1.33
included. 3.
8008 CENTRAL
Programmable ROM
256 bit RAM tri -state
MANI
- -
ASSEMBLED
8/51.50
1024 bit RAM MOS
1024 bit static RAM
2048 bit UV eras PROM
1024 bit RAM
1024 bit RAM
2048 bit RAM
64 bit ROM TTL
ME4
-
notion plus constant
addressable memory with
8 digit
individual recall
display plus overflow
uses standard
battery saver
a6
or rechargeable batteries
necessary parts in ready to
instructions
assemble form
5 f
bit dynamic RAM
256
MV108
MV50
MV5020
.25
.39
.39
.49
4071 AE
4072 AE
4073 AE
4075 AE
4078 AE
4081 AE
4082 AE
(Imp -16 standard
LED's
$ .25
.25
.25
CMOS
AE
AE
$1.99
1103
2101
5203
5260
5261
5262
7489
8223
74200
MAN2
MAN4
9601
9602
1024
bit static RAM
1101
MM5725
MM5736
MM5738
MM5739
MM5311
MM5312
MM5313
MM5314
81.49
1.45
1.69
1.69
8811
8812
8822
8830
8831
8836
8880
MM 5751
Control and read only memory
311
219
741174
741176
530.00ee.
Arithmetic and logic unit
POCKET
CALCULATOR
KIT
CT5005 CALCULATOR CHIP
1024
5/S1.00
MN/15316
74H55
74H60
74H61
74H62
74H72
-
MM5750
CALCULATOR &
CLOCK CHIPS
Data sheets supplied on request
Add $.50 ea. for items less than $1.00
4000
4001
4002
4006
4007
4008
4009
4010
4011
-
-
.29
.79
.59
.39
.89
1.69
5.99
2.79
.19
MICROPROCESSOR CHIPS
MEMORIES
79
9309
9312
18
5.25 ea.
9000 SERIES TTL
9002
9301
pin
Fully decoded
16 pin
-
.17
SPECIAL PURCHASE
LED DISPLAY MAN
8000 SERIES TTL
8091
8092
8095
8121
8123
8130
8200
8210
Fully decoded
MOS
5280
HIGH SPEED TTL
741100
1103
MOS
8.19
.19
inverter
Triple 3 input NAND
Quad 2 input NAND buffer
BCD to decimal DOW
Decade counter
Dual FR flip flop
Reirr'g m n tbl moll
Quad D flip Ilop
3 input 4 bd mull
2 input 4 bit mull
Quad 2 input NAND gate
30V hex
74C00
LOW POWER TTL
74100
74102
74103
74104
74106
74110
74120
74130
74142
Her inverter
7404
7406
7410
7437
7442
7490
71107
74123
74175
8263
8267
f
74177
74180
74181
74182
74184
74185
74187
74190
74191
74192
74193
74194
74195
74196
74197
74198
74199
74200
16 BIT
DIGITAL
DIP
DIP
DIP
DIP
DIP
.7!
.3!
.7!
7!
150
mDIP
mDIP
mDIP
.35
DIP
DIP
rnDIP
75
35
.35
15.
65
DTL
910
932
936
$ .17
-
.17
17
937
944
946
S
.17
.17
.17
949
S
962
963
.-7
.
postage paid in U.S., Canada
Shipment will be made via first class mail
and Mexico -within three days from receipt of order. Minimum order
$5.00. California residents add sales tax.
-
INTERNATIONAL ELECTRONICS UNLIMITED
P.O. BOX 1708
MONTEREY, CA. 93940 USA
/
PHONE (408) 659 -3171
Circle
7N
on reader service rand
www.americanradiohistory.com
93
Saxitone's Bicentennial Tape Shoppe
CASSETTE LABELS
Plain white cassette labels. Norelco cassette cleaners, famous brand cassettes. Send for open reel and
cassette discount catalog.
1
Cassette Labels (Multiples of 10)
Norelco Cassette Cleaner
'Scotch Cassette SC9OHE
-9 10-99
.65
.02
.60
100 1000
.015
.01
.55
.50
10M
.006
.45
3.25 3.10 2.95 2.80 2.75
'Buy 10, SC9OHE, get
5 free.
Plus Postage by Weight and Zone.
Minimum Order $5.00
OPEN REEL STEREO TAPE BUYERS!
At last! An open reel catalog, including titles, songs, etc. of 95 long
play, 2 -3 hour albums by American Airlines or Ampex 4 track stereo
tapes. Send $1.00 -and we will also mail you a 140 -page Harrison
stereo tape guide
you'll get both for $1.00 -and this $1.00 is
refundable on your first $10.00 purchase of open reel
stereo tapes at our 30% discount.
-
LOW -noise resistors -1/4W, 5% carbon film
from 10
3.3 megohms for 31/2c each.
Fifty of one value for $1.25. 1N4148 diodes
for 6c. 75c postage. Free samples /specifi-
cations. COMPONENTS CENTER -RE, Box
134, New York, NY 10038
irir'
Send For
"Spirit"
SAXITONE TAPES
The Prices And The Address To Prove
It
1716 Columbia Rd.. N.W., Wash. D.C. 20009
Canadian
Magazine, "Electronics
Workshop ", $5.00 yearly, sample $1.00.
ETHCO, Box 741 "A ", Montreal
NEW
Check these features:
Designed for maximum versatility to
meet your system requirements
Easy to assemble and use
Maximum noise rejection built in
Two sided epoxy, plated thru holes
Gold plated edge contacts
100% GUARANTEED
"%Pee
CORNELL'S
New Color
Catalog
Pgs. New Items
Per
tube
IN LOTS OF
100
ORDER FREE
IF NOT SHIPPED
IN 24 HOURS'
IEGO CALIF.
INPUT /OUTPUT
This one card will meet all common I/O
9210
requirements. Interface your Altair with
the TV Typewriter and at the same time a
teletype or modem, plus other devices.
Two input and two output ports
(parallel)
One
serial I/O for any teletype and /or
EIA RS -232C device, uses a UART
Two special ports for any imaginable
control needs
Program serial data from 35 to 9600
baud
Full I/O handshaking provided
ORDER KIT No. 3P +S
$125.
SAMS Photofacts, 1 -891, JOY CEARLEY,
6517 Dakar, Wort Worth, TX 76116. Phone
(817) 732 -5403
PHOTOGRAPHIC timer digital
readout,
crystal time base, alarm, footswitch, guaranteed. CASCADE LABS, 5637 Bayview Ave.
Richmond, CA 94804
S. D. SALES CO.
P.
MEMORIES
Our high speed low power static read
write memory (RAM) allows the 8800 to
run at top speed. All our memory IC's are
100% tested to Military STD-883! Each
card accepts up to 4096 8 bit words.
ORDER KIT No. 4KRA
w /4Kx8
$225.
125.
w /2Kx8
w/ 1K x8
85.
Our PROM card accepts up to eight
1702A or 5203 erasable programmable
read only memories. All necessary 8800
interface logic is provided but NO
PROM's.
ORDER KIT No. 2KRO
$ 50.
Write for assembled unit pricing. Send for
our FREE flyer or order now from:
PROCESSOR TECHNOLOGY CO.
2465 Fourth St., Berkeley, Calif. 94710
0. BOX 28810 DALLAS, TEXAS 75228
6 Digit
Digital Clock Kit
Our Engineer said it would be "impossible" to sell a Six Digit kit
for this price. But because of several special super buys we
made on chips and displays we can offer this unbelievable
bargain on our Clock Kit. Sure, this price is too good to be true,
but rest assured, all parts in this kit are prime, first run units.
money back
Also, all kits are sold with an
guarantee.
Here's What The Kit Includes:
1
MM5314 National Clock Chip with socket
Common Cathode Led Readouts (.25 in. char.)
6
NPN and PNP Driver Transistors
13
Push Button Switches for time set
2
1
Rocker Switch for time hold
995(KIT)
1000 MFD 25V Filter Cap
1
4
1
2
9
------
!
are fully 8800 compatible and include
every standard 8800 feature plus more.
PARTS!
-so
We've Got the
ALTAIR 8800 USERS
Get your system going inexpensively with
our memory and Input /Output cards. All
(415) 549 -0857
All items postpaid. California
residents add sales tax. 20% deposit
required on COD orders. Discounts: 5 %,
orders over $375; 10 %, over $600.
Terms:
Circle 87 on reader service card
ELECTRONIC Ignition: Capacitor, transistor,
pointless. Auburn sparkplugs. Information
10c. ANDERSON ENGINEERING, Epsom, NH
03234
s
-
WAREHOUSE
DISCOUNTS ON
NATIONALLY ADVERTISED
s
IN4001 Rectifiers
C.B. RADIOS
MONITOR SCANNERS POLICE
MARINE ELECTRONICS
/
1
1
IN FACTORY SEALED CARTONS
IN914 Diode
.01 Disc. Caps
Carbon Resistors
BUSINESS - RECREATION
WITH SPECS.
POSTPAID
PERSONAL
WRITE FOR QUOTE
(PC Board for Kit $3.00)
All you need to add is a 12VAC Transformer, perfboard, and your
choice of case. The above parts, if ordered separately from our
competitors, could cost you as much as $20. Buy from S.D. and
you'll be happy with our quality parts and ultra fast shipment.
-
SATISFACTION GUARANTEED
ELECTRONICS WAREHOUSE, INC.
1
/
/
8234 LITTLE RIVER TURNPIKE (DEPT. 7)
ALEXANDRIA, VA. 22312
OR PHONE: (703) 256-1300
1
4
ELECTRONIC parts! New! Solid State devices! Free flyer: DARTEK ELECTRONICS,
Box 2460, Dartmouth, Nova Scotia, Canada
U.S. inquiries.
FREE Bargain Catalog. Ultrasonic devices,
ARNOLD TORROID CORES
#A- 759135 -2. Perfect for chokes, transformers, etc. OD -1.875 IN.
60. L -135 MH /1000 turns.
ID -.918 IN. H -.745 IN. Permeability
1.95 CM2. Regular Factory Cost $5.00
Cross Sectional Area
Our Price
-
99¢
-
48 HOUR SERVICE
You deserve, and will get prompt shipment. On orders not
shipped in 48 FIRS., a 20% cash refund will be sent. We dc
not sell junk. Money back guarantee on every item. WE
PAY POSTAGE. Orders under 610 add 7591 Handling. No
C.O.D. Texas Res. add 5% tax.
94
-
INTEL 1K 2102 RAM
Factory prime, tested units. Factory selected for much
faster speed than units sold by others. 850 NS. These
are static memories that are TTL compatible and
operate off +5 VDC. The real workhouse of solid state
memories because they are so easy to use. Perfect for
TV typewriters, mini -computers, etc. With specs.
$8.99 ea. or8 for $40
Circle 89 on reader service card
www.americanradiohistory.com
transistors, IC's, keyboards, Xtals,
unique components. CHANEY's, Box 15431,
Lakewood, CO 80215
BURGLAR alarm dialing unit automatically
calls police. $29.95. Free literature. S &S
SUPPLY, Box 12375G, North Kansas City,
LED's,
MO 64116
INTEL 8080, 8 -bit CPU: $175.00; MM5203Q -1,
2048 RE -PROM: $15.50; AY5 -1008, TTY RX:
$6.00; AY5-1010, TTY TX: $6.00; AY5 -1013A
UART: $13.95; AY5 -2376 KYBD encoder:
$12.95; XR205, function gen: $10.50; XR210
FSK MOD /DEMOD: $6.00; XR2240, 5MHZ
XTAL: $2.95; TV- typewriter II PCB's (main
& memory):
$39.50; prog. timer: $4.95.
ELECTRONIC DISCOUNT SALES, 138 N.
81st ST., MESA, AZ 85207
l
SN7400N
SN7401N
SN7402N
SN7403N
SN7404N
SN7405N
SN7406N
SN7407N
SN7408N
SN7409N
SN7410N
SN7411N
SN7412N
SN7413N
SN7414N
SN7416N
18
.21
.21
.21
.21
.24
.45
SN7453N
SN7454N
.27
547459A
.25
.22
A5
9174944
37
.42
SN7495N
SN7496N
S474100N
.20
.30
.42
.85
.70
43
43
.25
.21
.39
.26
.31
47
.40
25
.21
1.10
1.08
1.05
1.10
1.10
1.15
.89
.99
.41
SN7460N
SN7470N
SN7472N
.31
.25
SN7418N
SN7420N
SN7421N
SN7423N
SN7425N
SN7426N
SN7427N
SN7429N
SN7430N
SN7432N
SN7437N
SN7438N
SN7439A
SN7440N
SN7441N
SN7442N
SN7443N
SN7445N
SN7446N
SN7447N
SN7448N
SN7450N
.27
.37
.43
.25
19
.45
.45
60
.47
.50
1.75
1.15
1.12
.45
3.50
3.00
.69
1.20
.82
.82
91
.91
.91
1.50
.49
SN74107N
SN74121N
SN74122N
.55
.49
5474123N
SN74125N
SN74126N
SN74132N
SN74141N
SN 741424
1.05
.60
SN74143N
SN74144N
SN74145N
+h!{
TTL
SN7451N
SN7473N
SN7474N
SN7475N
SN7476N
SN7480N
SN74824
SN7483N
SN7485N
SN7486N
SN7488N
SN7489N
SN7490N
SN7491N
SN7492N
SN7493N
.45
0474174
0474444
.81
100
1.15
6.50
7.00
7.00
1.15
2.50
1.10
SN74151N
SN74153N
SN74154N
SN74155N
SN74156N
SN74157N
SN74160N
SN74161N
SN74163N
SN74164N
SN74165N
54747664
SN741734
SN74174N
SN74175N
SN74I76N
SN74111N
1.25
115
125
1.21
120
120
145
1.65
1.65
1.65
1.70
SN74180N
SN74181N
SN74182N
SN74184N
5N74185N
SN74187N
SN74190N
SN74191N
SN74192N
SN74193N
SN74194N
SN74195N
SN74196N
SN74197N
SN74198N
SN74199N
SN74200N
SN74251N
OP AMP
LM307H
LM31I H
Super Op Amp
HI perl. V comp.
HI perl. V comp.
Timer
Phase lock loop
Tone Decoder
LM31I H
LM555V
NE565T
NE567T
.59
1.25
1.00
1.00
SN74H10N
SN74HI1N
SN7442ON
SN74H21N
SN14H22N
SN74H30N
SN74N40N
5N74H5ON
SN74H51N
.33
33
.33
.33
.33
.33
.33
.33
.33
.35
.33
SN74L02N
SN74L03N
SN74L04N
33
54741104
SN74L2ON
SN74L30N
SN74L42N
S4741134
5474 L744
SN74L75N
5N14L85N
SN74L86N
SN74L90N
.33
.33
.33
.33
.33
1.50
.69
.69
.79
1.15
69
1.60
C
0401
CD4013
C04016
C04011
C04019
C04020
C04022
C04023
C04024
C04025
CD4027
C04028
CD4O29
.39
.39
.39
3.75
.55
.89
69
.39
.39
1.00
1.00
2.65
1.15
1.50
1.50
39
1.95
.39
1.15
2.65
3.95
C04030
C04035
C04040
00
1.25
1.00
2.25
2.25
=r
C04042
C04044
C04046
004041
CD4049
004050
C04051
C04053
C04060
004066
C04069
D4071
CD4081
C
74COON
74CO2N
140044
3.95
2.75
275
275
2.75
IDO
1.00
3.95
3.45
4.85
2,25
.75
.41
.41
.39
.55
740157
740160
74CI61
740163
74C164
74C173
74C193
740195
80097
60
.60
-60
.60
60
60
1.25
598
LINEAR
LMI7IH
3.75
LM373N
3.25
LM212H
LM300H
7.00
LM377N
LM380N
LM380C4
LM381N
4.00
.80
65
3/1.00
LM301CN 3/1.00
.75
LM302H
LM304H
1.00
LM305H
.95
LM307CN
.35
LM301H
1.05
1.79
LM21IIN
1.19
LM29014
8.00
6.00
3.00
LM3065N
LM3900N
LM3824
NE501K
6.00
6.00
1M555661
NE5105
NE5314
NE536T
NE540L
LM30BH
1.00
LM308CN
LM309H
LM309K
LM310CN
LM311H
1.00
1.10
1.25
1.15
,90
NE550N
.79
NE553
NE555V
NE5654
2.50
LM3IIN
90
1.50
1.30
9.00
1.35
NE5654
NE566C4
LM318CN
LM319N
LM3190
LM320K-5
LM320K.5.2 1.35
LM320K.12 1.35
LM320K-I5 1.35
LM3234-5 14.00
LM314N
LM339N
LM340K.5
1.80
1.70
1.95
LM340K12 1.95
LM3404 15 1.95
LM340424 1.95
LM340To5 1.75
LM340To6 1.15
LM340T0-12 1.75
LM340To 15 1.75
LM34OTo24 1.75
LM350N
LM351CN
LM370N
LM370H
8091
8092
8095
8121
8123
8130
1.00
.55
1.75
1.15
NE567H
NE567V
LM703CN
LM709H
.75
1.25
1.95
1.95
1.25
1.95
.45
.29
LM709N
LM710N
LM711N
.29
.79
.39
LM723N
LM723H
LM7334
LM7391
.55
1.00
1.29
65
3/1.00
LM741C4 3/1.00
LM741.144 .39
.79
LM747H
LM747N
.79
.39
LM748H
LM748N
.39
LM1303N
.90
1.19
LM 13044
1M13054
1.40
LM 13074
65
LM741CH
598000 SERIES
59
1.39
.89
1.59
2.19
8200
8210
269
149
8214
8220
169
I
69
8223
8230
8263
8267
8280
8281
8288
8520
8551
'3.00
2.59
7.00
4.00
.75
.85
1.15
1.29
7.65
ea-
T.V. DIGITAL CLOCK
25' VIEWING DISTANCE
Walnut Case 6" a 3" a t"
Hi. & MIn. 6" High
Seconds.3" High
290
3.00
2.15
3.25
3.25
3.00
3.25
2.60
2.75
2.75
1.50
1M39054
MC5558V
LM7525N
LM75284
LM7534N
LM7535N
80388
1475450
75451CN
754520 N
754530 N
1.65
1.75
.65
.95
1.85
1.95
2.95
.59
-
539.95
$44.95
-
115 Vac
SWITCHES
Touch Tone
Locking 0.58 DC
1.9 1029
PART NO.
30 up
30
.27
DP DT
No schematic needed.
Ipop'ofll key tops.
223.4620619
-4
.39
5
52.95
ea.
ea
SUB-MINATURE TOGGLE
P
Fm Ihe ecnnoniy inu,ded student ut expe,imemer
SPOT
ON NONE ON
ice
2A
art No. 1
MT- 2.05
1.65
123
-poom0wmno
NONE ON JMT- 2.95
223
SPOT ON
low cost, big 10 IC capacity
breadboard kit with all the quality of
Here's
e
PB
OT Sockets and the best of the Proto
complete down lo the
board series
last nut, bolt and screw. Includes
2 0T -355 Sockets, I OT58 Bus Stop
posts(4 rubber feet;
nuts, bolts, and easy assembly
marummns.
y b
d
1995
KIT...
& 3.
-
PUSHBUTTON SERIES
for N
C
2 15
(SPOT)
Se
AMP RATINGS
Momentary Action Switch
Normally Open or Normally
Closed. (For
C circuit use
Inals 2 &I: for N 0.2
5
g
COMPLETE
and N 0, 1,2 83 PB.126 $2.35
51.95
MAN
Ann.
Common Cathode
51.95
CC
MAN 7
01_ 33
Coin
Com
Com,
Com.
Com.
Cath.
30
125
OL747
Com.Ano.
625
MAN
I
3
MAN 4
COt,
Cath.
Ano.
270
125
IC
pin
14 pin
16 pin
SOLOERTAIL
2549
5.22
8
26
.29
46
.65
pm
MV
MV
MV
MV
MV
MV
.95
1.95
1.50
1.95
2.50
I81
124
CA3091
CA3113
CA3600
8552
8554
8810
X9 -555CP
Monolithic Timm
-
Red
50
Red
5024
Bed
S100
551011
5024
5024
5024
Green
4
4
Orange
4
LOW PROFILE (TIN) SOCKETS
124
.20
.23
.18
24 pin
.21
26
24
17
28 pin
36 pin
40 pin
41
$
s1 00
SI IIII
SI 00
.68
89
1.10
1.25
.56
.73
.90
.93
.53
59
36 pin
1.39
29
37
40 pIn
1.59
.54
49
.33
.42
.59
.31
pIn
pin
pin
pin
0 -30
.27
24
24 pin
.35
.38
52
32
29
28 pin
36 pin
40 pin
pin
$45
41
.46
.55
.75
42
.37
38
24 pin
14 pIn
50
45
68
.62
36 pin
40 pIn
24 pin
Si
.90
1.26
1.45
.99
$
115
18
35
32
47
43
16
mn
2513'
2524'
2525
700
2529'
DIODES
1.35
1.15
63
100
.9O
1.55
1.40
1.59
1.26
1.45
1.75
SI D5
95
40
125
28 pin
1
1.59
1.75
1
.85
1.10
1.30
1.40
45
155
2.80
.85
1.60
.59
3.25
8.25
1.85
1.75
249
249
79
8820
8826
8830
2.00
3.00
159
8831
2.59
8836
8864
8880
49
200
1.35
OHM. 120HM 15 OHM- 180HM- 22 OHM
OHM. 33 OHM. 39 OHM. 47 OHM. 56 OHM
1/4 WATT
5 %=
50 PCS.
68 OHM- 82 OHM -100 OHM -120 OHM -150 OHM
180 OHM.220 OHM 270 OHM330 OHM -390 OHM
1/4 WATT
5 %=
50 PCS.
470 OHM -560 OHM.680 OHM.820 OHM1.2K
1.5K
1.8K
22K
1/4 WATT 5 %= 50 PCS.
IX
2.7K
3.3K
39K
4.7K
5.6K
6.8K
8.24
IOK
02K
15K
18K
221(
391(
ASST. 4
5 ea:
ASST.
Sea:
56K
27K
68K
33K
82K
100K
47K
120K
N752
N753
N754
N965B
N5232
5.6
6.2
50
200a'
400m
75
35
IDer
6.8
15
400m
500m
500m
200PIV
35610'
1188
400 PIV
35 4,
45234
45235
N5236
4456
N4001
5.6
6.2
6.8
7.5
25
150
180
50 P1
44002 100 PO/
.28
.28
.28
.28
500m
500m
40m
7m
10m
/1.00
6/1.00
5/1.00
6
1
AMP
.09
I
AMP
10
2701(
3301(
5 ea:
180K
470K
2201(
ASST. 6
150K
390K
560K
6806
820K
1M
1.2M
1.5M
16M
22M
ASST.
5 ea.
2.7M
13M
3.9M
4.7M
5.60
7
N
I
242221
24 2222A
2N2369
2N2369A
242484
22 pl
47 pf
100 pl
120 pl
470 pl
2N2906A
24 2907A
243053
243055
2N3725A
243903
243904
.25
3/$1
4/$1
5/$1
5/$1
4/S7
4/57
12/1.00
.28
.28
.28
.28
.28
.28
1.60
1.10
1.80
3.00
10e
Ira
ley
lam
by
lee
12
Iw
15
50 PIO
100 PIV
NIP
35
35 te
Um
I"
1/4 WATT
5 %=
50 PCS.
1/4 WATT 5%= 50 PCS.
4 /$1
2151
24512.9
4/01
5/$1
.19
5/S1
245139
4/01
C10681 SC;
19
04
.001
05
04
.0047
.05
01
01
.05
.01
.022
.06
03
.047
.06
.035
.1
.12
.0022
.0047m1
.12
.12
.12
a
-
-
)4
E
P.O. BOX 822, BELMONT, CA. 94002
PHONE ORDERS
- (415) 592 -8097
retnier el'I'lly' l'art/
www.americanradiohistory.com
50.100
.035
.035
.035
.04
05
05
09
.04
.075
100 VOLT MYLAR FILM CAPACITORS
.13
11
.022m1
.10
.07
.21
.17
.047m1
.07
.10
.27
.03
.1mí
.07
.10
.22mí
.33
77
.07
.10
20% DIPPED TANTALUMS (SOLID) CAPACITOF S
17
.23
1.5 35V .30
.26
.23
.17
2.2 25V .31
.23
.17
3.3 25V .31
4.7 25V 32
.23
.17
.28
.23
.17
60 25V .36
11
.17
.21
10
25V 00
.35
.23
.17
15
.58
25V .63
.08
.13
.17
.22
.21
.22
.22
.23
.25
.29
40
MINIATURE ALUMINUM ELECTROLYTIC CAPACES IRS
1/4 WATT 5 %= 50 PCS.
Satisfaction Guaranteed. $5.00 Min. Order. U.S. Funds.
California Residents Add 6% Sales Tax
Write for FREE 1975 Catalog
Data Sheets .25C each
19
2 /S1
VOLT CERAMIC DISC CAPACITORS
.03
.28
.28
.28
.28
.28
.28
1.0 35V .28
4/Sí
244409
04
35V
35V
35V
35V
47 35V
68 35V
4 /$I
PN425C
.04
22
33
110
13144240
.05
15
1/4 WATT 5 %= 50 PCS.
243905
24390E
S1
2.51
95
5
.05
.12
.01mf
451
Axial Lead
7777
6/1.00
15/1.00
CORNER
50
.001mí
47
CIO lt' V)
.10
.10
IAM'
5.6
6.2
6.8
8.2
5/$1
24918
2N2279A
1
5
PRICE
5.1
200PIV
400PIV
1AM'
4751A
.04
246
(Rectifier)
VOLTS W
44003
N4004
N3600
44148
44154
44734
44735
44736
44738
N4742
44744
N1183
N1184
41186
.04
.04
.04
5 ea:
1.75
1.75
406i:
TYPE
.05
.05
.05
.05
3
4.50
1.65
00410
4/1.00
4/1.00
4/1.00
4/1.00
4/1.00
4/1.00
lopf
ASST.
MC4 0/4
4045 I
PRICE
MPS.A05
57
.70
1.10
S
50 PCS. RESISTOR ASSORTMENTS $1.75 PER ASST.
5 ea:
52.25
3.00
4.00
400m
400m
400m
400m
50 100
03
03
.03
ASST- 2
NET
MCI '41
W
1049
27
1024"
3.3
1.9
10
3.79
VOLTS
4111-
5 ea:
11.00
7.00
4.00
3.50
7.00
4.00
2518
2519
1.25
8557.1
s 4.00
8267
$29.95
2.25
5.50
9.95
5.95
18,00
495
18 pIn
3.85
5.80
4.80
5.20
6.70
TRANSISTORS
WIRE WRAP SOCKETS (GOLD) LEVEL e3
10
5.50
3:85
1.30
SOLOERTAIL STANDARD (GOLD)
8
14
8.40
N746
N485A
18 pin
1.70
3.20
3.20
3.20
*Special Requested Ite ns*
N458
26
29
6.00
1.95
Monolithic function Generator
XR- 2207CP Vollage-Controlled Oscillator
OTHER EXAR IC'S
XR.1468CN Dual + 15V Tracking Regulator
OR -1488N
Quad Line Driver
XR- 1469ÁN
Osad Line Receiver
XR- 2208CP
Operational Multiplier
OR-2211 CP FSK Demodulator/Tone Decoder
Monolithic Proportional Servo IC System
XR.2261
w/4 ea. Driver Transistor
12enerl
.62
.81
.99
1.13
5.20
Waveform Generator
XR -205
XR- 2206CP
TYPE
50100
3.20
4.80
WAVEFORM GENERATORS
R C4194 TO
8101
8267
25-49
50.100
.20
.60
1.85
1.00
.90
.49
.39
.39
.39
1.10
1.55
1.85
S
Precision Timer
XR -556CP
Dual-555 Timer
OR-2556CP
Dual Timing Circuit
Programmable Counter /Timer
X R-2240CP
PHASE LOCKED LOOPS
XR-210
FSK Demodulator
High Frequency PLL
XR-215
XR-567CP
Tone Decoder (mini DIP)
Tone Decoder (TO -5)
XR -567CT
STEREO DECODERS
XR-1310P
PLL Stereo Decoder
PLL Stereo Decoder
X R-1310EP
PLL Stereo Decoder
XR-1800P
805.1013 DART
51011
10
530
pin
16 pIn
IB pIn
14
16
75454CN
.39
7549 ICN
.79
75492CN
.89
75494CN
69
RCA LINEAR
1.70
CA3013
0A3023
2.15
CA3035
2.25
CA3039
CA3046
CA3059
CA3060
CA3080
CA3083
CA3086
CA3089
for PC board.
TIMERS
8008 Processor
1101 256 e I RAM
2102 1024 RAM
DISCRETE LEDS
DISPLAY LEDS
Common Anode
CA
55
2.20
2.20
$7 9.95
R2206K8
Same as X R-2206KA above and includes external coisoonents
All Comp. &Case
Wired & Assembled
KIT
SR22D6KA
Includes monolithic function generator IC, PC board, ani aembly
instruction manual.
X
65
2.15
1.50
1.15
3 00
2.00
1.25
5%typ..
capabdlly
$19.95
or
SOLDERTAIL STANDARD (TIN)
1M13514
LM1414N
LM1458C
LM1496N
LM1556V
1.39
x IV,,"
SLIDE SWITCHES
-
20 Keys
22 pin
250
3"
....
MULTIPURPOSE KEYBOARDS
18
15.00
e
ave;
i
OR -320P
65
.75
LM100H
LM106H
3"
Tilts unit may be cut
apart for smaller units.
SN7431534 2.50
74C ION
74C20N
74C30N
74C424
74C73N
74C74
74C90N
74C95N
74C107N
74C151
74C154
Size(
8' POWER SUPPLY CORDS
$1.45 ea.
Black or Gray
2.50
6.00
6.00
.65
PM'c
$39.95
LSI Design
MOS
WALL
700
SN74$11N
SN74$15N
SN74$20N
SN74$22N
SN74$40N
SN74564N
SN74$65N
SN74S112N
ana
s,:t.,,
TrJO,
1
.60
00
2.65
XR-22061(
stmCnO. rFHenarpn xn
$9.95 per kit
3 readout
with man
1.45
S474$104
I
levels, pulses,
DIGITAL VOLTMETER KIT
0.10 Voll, S% digits (Men 7) DVM
140
SCHOTTKY
SN74$00N
.60
.60
SN74303N
65
SN74$04N
SN74$05N
65
CMOS
5/31 00
.79
1W
Logic Probe Kit
Detects TTL
IT
I(
15/51:00
IS /51.00
20/$1.00
1
NEW KITS
TTl
-° KIITS
FUNCTION GENERATOR
15 /$1.00
1
NPN
2
2 5-
C04000
C04001
C04002
C04006
C04007
C04009
C04010
C04011
7/$1.00
6 /51.00
3.95
1
SN74LOON
100Piv
KmQ
IC'S
TRANSISTORS
400M
400M
I AMP
AMP
AMP
2/$1.00
2/51.00
S3.25
LOW POWER
N9658
N4002
15
N3055
.75
.69
1.25
1.25
1.75
4' POWER SUPPLY CORDS
Black
5.1
44003
200Piv
4001(iv
44004
44148 1149141
44735A
6.2
.75
Volt. Reg.
Volt. Reg.
Furman Generator
LM723N
8038
4751A
4/51.00
4/01.00
Tone Decoder
NE567V
LM723H
2_30
20
6.00
1.50
1.50
1.50
.89
1
LM301AN
-
DIODES
631.00
LINEAR IC'S
1.75
1.70
1.95
1.95
.90
90
1.05
3.55
95
TTL IC'S
Ouad. Nand Gate
BCD -Seven Seq. Dec.
Oerade Counter
4 87 Bistable Lath
16 -Lore Mult.
4.16 Line Decoder
7400
7447
1490
74100
74150
74154
SN74167N 560
SN74170N 100
SN74172N 18.00
S4741484
S4742844
S4741504
S4742854
20% Discount for 100 Combined 7400's
26
HIGH SPEED
SN74H00N
.33
.33
SN74H01N
.33
SN74H04N
SN74H05N
.35
54744084
Specials`
* JAMES Summer
7400N
ARV
10
25
15
lo
50
.1s
22
25
50
25
50
25
.17
15
.12
.12
.24
20
18
.19
.17
15
10
.25
.24
.21
20
.19
10
18
10
50
.30
.28
.28
25
41
38
25
16
.35
.32
.45
.33
.55
.27
16
70
.29
.50
62
47
100
100
100
220
470
3.3
4.7
22
47
47
100
100
220
220
470
1000
2200
50
50
50
25
25
50
.15
.16
.15
.16
47
.47
.13
.14
.13
.14
.13
.14
I
10
.11
10
1
.12
I
IO
45
55
1
4.7
4.7
4.7
Radial Loa
1'
3
4
.10
16
25
50
3
.10
4
4
.11
.11
16
3
.10
25
3
50
16
25
4
10
.11
2
.09
1
50
50
4
16
5
7
.10
.12
.19
.14
.18
.28
.16
B
26
25
50
I
0
0
25
50
16
25
i
.11
.
95
MEMORY SYSTEM $125.00
-,STOP THIS MAN
AT YOUR DOOR!
.`
1024 core memory system, 1024 words memory,
8, 9, or 10 bits /word. Random access, with all
LOOK FOR
$12ás
logic,
register, timing, control, core select
and sense functions in one package. New,
with 60 page booklet includes schematics,
Measures only 9x4x1 inches. Good start for
mini- computer.
THE
TONE GEN. BOARD
-
Now available in kit form you can
build your own home /apartment security
alarm and save dollars.
The alarm automatically provides a
fixed exit delay, variable entry time, and
anti -noise pollution bell shut -off. Kit
comes with drilled P.C. board, resistors
capacitators, diodes, silicon transistors,
and some hardware.
To complete the alarm you need only
a cabinet, 12 volt battery, and wire in
N.C. perimeter switches, which are
available at local electronic parts stores.
Octave tone gen. board from Magnus Organ.
Unused with instructions & amp. $9.95 2 for $18.
3
AUGUST
PIANO KEYBOARD $9.95
For use with above organ or synthesizer, etc.
MULTI -USE XFMR $8.95
ISSUE OF
Output
BELLTONE PAGER
RADIO -
Made for Bell System. Clip -on
belt or pocket pager- receiver.
Used condition, complete
radio receiver on freq. of 35
Mhz with reed -decoder tone
alert. An interesting & useful
experimenters gadget. Limited
quantity.
#SP- 125
$5.00 each 6/$25
ELECTRONICS
FREE
for limited time a 6" alarm
bell will be included with each kit ordered.
Total shipping wt. 212 pounds.
6 amp; 17 V @ 6 amps; 10 V
Brand new. $8.95 ea., 2 for $15;
18 V @
@ 10 amp.
10 for $50.
Please add shipping cost on above.
AT YOUR
FREE catalog
R. A.G.S.
1751 SARATOGA AVE.
SURPLUS
ELECTRONIC
MATERIAL
P.O. Box 62
19 ALLERTON STREET
E. LYNN MASS. 01904
NEWSDEALER
SAN JOSE, CALIF. 95129
TERMS: California residents add 6% sales tax.
No cash or C.O.D. orders, please. Include sufficient
postage, excess refunded.
JULY 17
Circle 81 on reader service card
Circle 84 on reader service card
CB SPECIALS
2SC517
2SC710
2SC711
2SC735
2SC756
2SC773
2SC774
4.75
.70
.70
.70
1.50
.85
1.75
2SC781
2SC799
2SC1013
2SC1014
2SC1017
2SC1018
2SC1173
3.25
4.25
1.50
1.50
1.50
1.50
1.25
2SC1237
2SC1239
2SC1243
2SC1306
2SC1307
2SC1377
2SC1449
2.00
2.80
1.50
5.25
6.25
6.75
3.50
OEM SPECIALS
2SC1678
2SC1679
2SC1957
2SD235
MRF8004
4004
4005
5.75
5.75
3.50
1.00
3.00
3.00
3.00
JAPANESE TRANSISTORS
2SA52
2SA101
2SA103
2SA221
2SA473
2SA495
2SA497
2SA505
2SA562
2SA607
2SA613
2SA643
2SA647
2SA673
2SA679
2SA682
2SA699
2SA699A
2SA705
2SA714
2SA720
2SA733
2SB22
2SB54
2SB56
2SB77
2S8128
2SB135
2SB152
2SB172
2SB173
2SB175
258178
2S8186
2S8187
2SB235
2SB303
258324
2SB337
2SB364
2SB365
2SB367
96
2S8370
2S8379
.70 2SB380
.60 2SB405
.85 2SB407
.65 2SB415
.60
.70
.55
65
.70
2.25
1.00
.85
2SB461
2SB463
2SB471
2SB474
2SB481
2SB492
2SB495
.85 2S8605
2.25 2SB606
.95 2SC15
1.30 2SC24
2.00 2SC32
.55 2SC33
2.50 2SC41
.70 2SC49
.65 2SC56
.65 2SC143
2.75
.70
.70
.70
2.50
.95
2SC154
2SC162
2SC163
2SC185
250202
4.50
2SC206
2SC240
.55 2SC261
.55
.55
1.00
.60
.60
1.95
.65
1.00
2SC291
2SC320
2SC352
2SC353
2SC371
2SC372
2SC380
2.10 2SC387
.65 2SC394
.65 2SC458
1.60 2SC460
1.10
.65
.70
1.00
2SC478
2SC482
2SC491
2SC495
2.10 2SC497
1.05 2SC515
1.25 2SC535
1.65 2SC536
1.75 2SC537
1.75 2SC563
2.10 2SC564
1.25 2SC568
.95 2SC582
2.00 2SC591
2.00 2SC605
.65 2SC619
.65 2SC620
.65 2SC627
.65 2SC644
4.00 2SC645
.80
.95
3.50
3.75
3.75
4.50
1.00
1.00
1.00
1.10
.65
.65
.75
.75
.75
.70
.70
.70
.70
.70
.70
.70
2SC681
2SC684
2SC687
2SC696
2SC710
2SC711
2SC712
2SC713
2SC732
2SC733
2SC735
2SC739
2SC756
2SC774
2SC775
2SC778
2SC783
2SC784
2SC785
2SC792
2SC793
2SC828
.80
1.75
2.50
.70
1.60
.80
.95
.65
.70
2.50
.70
.70
.85
2.50
1.00
.70
.80
1.75
.70
.85
2.50
2.10
2.50
2.35
.70
.70
.70
.70
.70
.70
.70
.70
1.50
1.75
2.00
3.00
1.00
.70
1.00
3.00
2.50
.75
2SC829
.75
2SC833
.70
2SC838
.70
2SC839
.85
2SC930
.65
2SC945
.65
2SC1010
.80
2SC1012 .80
2SC1013 1.50
2SC1014 1.50
2SC1018 1.50
2SC1030 3.25
2SC1051 2.50
2SC1061 1.65
2SC1079 3.95
2SC1096 1.20
2SC1098 1.15
2SC1115 2.75
2SC1166 .70
2SC1170 4.00
2SC1172B4.25
2SC1173 1.25
2SC1213 .75
2SC1226 1.25
2SC1237 2.00
2SC1239 2.80
2SC1293
.85
2SC1308 5.00
2SC1317 .60
2SC1325 5.00
2SC1347 .80
2501377 6.75
2SC1383 .75
2SC1393 .60
2SC1409 2.75
2SC1410 2.75
2SC1446 1.25
2SC1447 1.25
2SC1448 1.25
2SC1450 1.00
2SC1454 2.75
2SC1507 1.25
2SC1509
2SC1569
2SC1756
2SD30
2SD45
2SD64
2S065
2SD68
2SD72
2SD88
2SD120
2SD130
25D141
2SD151
250170
2SD180
2SD198
2SD201
2SD218
2SD235
2SD261
2SD291
2SD292
2SD300
2SD313
2S0315
2SD318
2SD341
250350
2SD352
2S0380
2SD389
2SD390
2S0437
2SD458
2SD1111
2SD1115
2SK19
2SK30
2SK40
3SF11
SG609
1.25
1.25
1.25
.95
2.00
.75
.75
.70
1.00
1.50
.85
1.50
2.25
250
2.00
3.00
2.50
2.50
5.00
1.00
.80
.85
.85
2.50
120
75
.95
.95
3.50
.80
6.00
.95
.75
6.00
.80
3.50
3.75
2.25
1.25
1.60
3.14
4.95
20% off on Replacement orders of 25.00 or more Above is partial hst of current sack
available at &mat reductions. Send for complete lisy
ALL PARTS GUARANTEED AND TESTED ON PREMISES.
WRITE FOR FREE CATALOG AND LG. QUANTITY DISCOUNTS.
1N270
1N749,A
1N750.A
1N751,A
1N914
1N4148
1N4746
1N4747
1N4749
1N5355
.06 2N630
.16 2N677C
.16 2N706
.16 2N706B
.06
.06
.50
.50
.50
75
1N5357,A,B.75
1N5358.A,B.75
1N5359,A,B.75
2N173
2.00
2N178
.90
2N327A 1.25
1.25
2N334
2N336
.90
2N338A 1.10
2N398B
.90
20
2N404
1.05
2N443
2N456
1.15
2N501A 3.50
2N508A
.35
2N512B 2.50
2N555
.45
2N652A
.90
2N711
2N711B
2N718
2N718A
2N720A
2N759A
2N760
2N877
2N894
2N918
2N930
2N956
2N960
2N962
2N967
2N1136
2N1137A
2N1142
2N1143
2N1302
2N1305
2N1377
2N1420
2N1483
3.10 2N1540 .90
5.00 2N1543 3.00
.20 2N1544 .80
.35 2N1549 1.05
.35 2N1551 3.50
.50 2N1552 3.50
.18 2N1554 1.75
.25 2N1557 1.50
1.35 2N1560 3.00
.90 2N1605 .35
.30
.40 2N1613
2.25 2N1671 1.00
1.75
.19
.19
.20
.40
.40
.40
1.25
1.65
1.95
1.75
.25
.30
1.25
.18
1.00
2N1711
2N1907 425
2N2060 1.90
2N2102 .40
2N2218 .20
2N2218A .25
2N2219 .20
2N2219A .25
2N2221
.19
2N2221A ,19
2N2222 .19
2N2222A .19
2N2270
.30
2N2322 1.50
2N2323 1.60
To -18
To-18
To-92
To -92
To-5
To -18
2.10
3.00
4.00
4.25
6.00
.25
.19
.20
.25
.40
3.50
.19
.25
.19
.25
.19
.20
.19
2N3247
2N3250
2N3375
2N3393
2N3394
2N3414
2N3415
2N3416
2N3417
2N3442
2N3553
2N3563
2N3565
2N3638
2N3642
2N3643
2N3645
2N3646
2N3730
3.50 2N3856
.40 2N3866
4.95 2N3903
.19 2N3904
.19 2N3905
.22 2N3906
.25 2N3924
.28 2N3925
.30 2N3954
1.90 2N3954A
1.50 2N3955
.18 2N3955A
.18 2N3957
.18 2N3958
.19 2N4037
.15 2N4093
.15 2N4124
.10 2N4126
.25
1.25
.75 2143731 1.65
1.25 2N3740 1.00
3.75 2N3771 1.90
1.25 2N3772 2.00
.19 2N3773 2.10
.70 2N3819 .25
.75 2N3823 .60
2.10 2113843 .25
20
.90
.19
.19
.19
.19
2N4403
2N4409
2N4410
2N4416
.19
2N4441
.85
.75
2N4442 .90
3.25 2N4443 1.25
4.50 2N4852 .60
4.50 2N5061
.25
4.90 2N5064 .40
2.50 2N5130 .19'
.15
2.90 2N5133
1.30 2N5138
.15
1.20 2N5154 6.25
.60 2N5157 8.95
.90 2N5198 3.85
.60
.18 2N5294
.45
.23 2N5296
2N4141
.23 2N5306
.20
25
2N4142
.16 2N5354
20
2N4143
.15 2N5369
.50
2N4220A .90 2N5400
.50
2N4234 125 2N5401
.35
2N4235 1.60 2N5457
.35
2N4400
.19 2N5458
2N4401
.19 2N5467 28.00
.45
2N4402
.19 C10681
.50
.65
.55
.75
1.00
INTEGRATED CIRC.
UA703C
.40
4.00
CA3066
6.50
CA3068
1.50
MC1305
Replacement for Zenith
221 -36, 221 -37, 221 -39 3.50
RECTIFIERS
1N4001
10
100
.60
.70
.80
5.00
6.00
7.00
8.00
9.00
10.00
11.00
1N4002
1N4003
1N4004
.90
D5E37
4/1.00
1N4005 1.00
1N4006 1.10
1N4007 1.20
TRANSISTOR GRAB BAG -Germanium and Silicon small sigs and power transistors.
FAIRCHILD 9L00 IC's, prime units.
Untested. 50 /1.00
HOBBYISTS 16 Pin Digital IC- Untested. 15/1.00 709C Hi -Pert. Op Amp 5/1.00
Fairchild 7400 IC- While They Last! 8/1.00
741C Hi -Pert. Op Amp 4/1.00
2N1671
.19
.19
2N2324 2.00
SILICON UNIJUNCTIONS
2N2646
2N2647
2N6027 PUT
2N6028 PUT
.30
2N2325
2N2326
2N2327
2N2328
2N2329
2N2368
2N2369
2N2484
2N2712
2N2894
2N2903
2N2904
2N2904A
2N2905
2N2905A
2N2906
2N2906A
2N2907
2N2907A
2N2913
2N2914
2N2916A
2N3019
2N3053
2N3054
2N3055
2N3227
.29
,New- Z-one electronics
P.O. BOX 1738 A
BLOOMFIELD, N.J. 07003
TERMS: Check or money order, COD's accepted. Include 10% for postage and handling. N.J. residents
add 5% sales tax. Minimum order 5.00.
Circle 82 on reader service card
www.americanradiohistory.com
WAVEFORM GENERATOR
XR205K
KIT Only $25.00
C-MOS
1-9
10up
a highly versatile lab in
strument ate fraction of the cost
of conventional unit. Kit includes
two XR205 IC's, data & applications, PC board (etched & drilled,
ready for assembly) and detailed
instructions.
40004E
.26 .25
400145
.26 .25
400245 .26 .25
400445 5.83 5.82
400645 1.35 1.34
.26 .25
40074E
40084E 1.79 1.78
40094E
.60 .59
40104E
.59 .58
40114E
.26 .25
40124E
.26 .25
40134E
.47 .46
401445 1.49 1.48
40154E 1.26 1.25
40164E
.56 .55
40174E 1.20 1.19
40184E 1.49 1.48
40194E
.52 .51
40204E 1.49 1.48
40214E 1.34 1.33
40224E 1.11 1.10
.26 .25
40234E
40244E
.90 .89
40254E
.26 .25
40264E 3.72 3.70
40274E
.60 .59
40284E
.98 .97
40294E 1.27 1.26
40304E
.44 .43
40334E 3.01 3.00
40354E 1.27 1.26
40404E 1.49 1.48
40414E 4.06 4.05
40424E
.75 .74
40434E
.60 .59
40444E
.60 .59
40474E 3.54 3.53
40484E 1.43 1.42
40494E
.52 .51
40504E
.52 .51
40514E 1.34 1.33
40524E 1.341.33
40534E 1.34 1.33
40554E 2.68 2.58
$.14
.17
.14
.17
.20
.20
.35
.45
.18
.23
.18
.27
.52
.65
1.80
.37
.36
.37
.17
.60
.27
.48
.34
.27
.31
.52
.20
.27
.62
.36
.35
.90
.16
.95
.78
.95
74SO4N
74508N
74ß10N
74ß11N
74520N
74ß30N
74S32N
74ß40N
74ß51N
74ß64N
.34
.34
74LOON
74L02N
74L03N
74L04N
.39
.39
.34
74L1ON
74L20N
74L42N
74L51N
74L73N
74L74N
74L90N
74L93N
74L95N
93L00
93L01
93L08
93L09
93L10
93L11
93L12
93L14
93L16
93L18
93L21
93L22
93L24
93L28
93L34
93L38
93L40
93L41
93L60
93L66
.39
1.62
.34
.74
.89
1.62
1.74
1.62
1.50
1.60
3.20
1.80
2.80
4.20
1.80
1.70
3.20
3.50
1.50
1.80
2.80
3.70
4.00
4.20
6.50
6.50
3.00
2.70
COMPUTER
9600PC
9601PC
9602PC
9614PC
9615PC
9616DC
9617PC
9620PC
9621PC
2.40
6.90
2.40
5.20
6.00
4.40
1.30
1.20
2.10
2.30
2.40
5.00
3.50
4.00
4.00
V¡p= 6mV
=
l
1000 nA
lb= 2000 nA
Noise = 1.5dB
6.10
2.70
2.20
1.50
3.60
.90
2.40
2.40
.90
2.40
2.40
2.40
745158N
74S160N
745161N
745174N
745175N
2.40
4.70
4.70
3.30
3.30
74S194N
745195N
74S251N
745253N
74S257N
74S258N
74S260N
74S280N
.38
.37
.40
.36
.36
.36
.36
.36
.36
.36
.36
.36
.36
74H 30N
74H40N
74H5ON
74H51N
74H52N
1.51
.50
.50
.90
.60
.64
.95
1.80
.92
2.50
1.19
1.08
2.90
2.20
.99
.84
1.50
1.05
1.48
1.08
1.18
1.18
1.44
1.50
4.90
3.30
3.30
2.40
2.40
2.40
2.40
.90
5.70
74H53N
74H54N
74H55N
.36
.36
.36
74H6ON
.36
74H61N
74H62N
74H71N
74H72N
74H73N
74H74N
74H76N
74H101N
74H102N
74H 103N
74H106N
.36
.36
.80
.74
.90
OL101
DL57
DL61
6.50
4.90
C31014
7.30
P31014
5.80
IM5501CDE 7.30
IM5501CPE 5.80
MM5560D
7.30
MM5560N
5.80
DM8599N
5.80
93403PC
5.80
C3101
P3101
TWO -PHASE
MOS CLOCK
DRIVER
MHO026CN
$5.50
AUDIO AMPS
Type
LM352
V
W
S2
6.15 1.15
T44611612
TAA621Al2
T84641B11
TBA800
TBA810AS
784820
TCA830
TCA940
6-27
6-15
6-27
6-18
5-30
4-20
3-16
5-20
6-24
8
2.80
1.15
1.40
2.20
4.70
2.50
0.75
2.00
6.50
A PORTABLE
DIGIT
MULTIMETER
414
FOR $299.
A 10 MHZ
COUNTER OPTION
FOR $50.
GENERATOR
Interdesign 1101: 0.1Hz -2MHz,
0 5V Output, var. width line or
battery operation.
$159.00
0L44
DL402
DL701
DL704
DL707
DL747
XCITON
XAN72 Red
XAN52 Green
c.
.
13
Ot717
01817
oe
+19W
1024 -BIT
N- Channel
RAM
2601-1
2601-21
11.40
11.40
7552-1CPE
7552-2CPE
11.40
8.00
8.00
26028
2602-1B
2602-28
MK4102P
8.00
8.00
8.00
74LSO1
741,502
74LS03
74LSO4
74LS05
74LS08
74LS09
74LS10
74LS11
74L815
74Lß20
74LS21
74LS22
74LS27
74LS30
74LS32
74LS51
74LS54
74LS55
74LS73
74LS74
.58
.58
.58
.58
.63
.63
.58
.58
.58
.58
9 -DIGIT
8
8
8
4
8
4
4
4
8
2524V
.90
.80
.80
Recirculating 512 Bit
Dynamic Shift Register
-24: $3.90 25 up: $3.80
1.10
.95
4
6
8
10
pin
pin
pin
pin
pin
.58
.58
.58
.58
.64
.58
.64
.58
.58
.58
.92
.92
75107BN
751088N
75109N
75110N
75115N
75138N
75150N
75154N
75208N
75234N
75450N
75451N
75452N
75453N
.40
.55
TO -5
.65
TO -5
.90
T(3-5 1.10
TO -5 1.40
1404AN
14054
1506
1507
1602
1702
C2102
P2102
C2102-1
P2102 -1
6.90
8.50
5.40
8.00
5.40
8.00
5.40
4.10
4.00
4.00
33.00
33.00
8.00
6.00
8.00
6.00
2524V
2525V
2533V
8.00
6.00
3.30
5.50
4.00
3.90
5.30
8.50
7522N
523N
7524N
7525N
3341PC
MM5025N
MM5026N
MM5027N
8.20
20.00
20.00
20.00
MM5056N
MM5057N
MM5058N
5.50
5.50
5.50
5.50
MM5055N
For simultaneous sine, square
and triangular waveforms 6.001
Hz to 1MHz.
Part No.
1 -9
10 up
8038CCPD
$4.50
$3.70
XR1310 $3.20
6-1.61311f
LOWPR )FILE
$.25
226 Noe
226 'ieaw .30
30
226 Gee rt
226 Ora le .30
1.30
1.40
ILi6 1.80
IL74 1.35
ILD74 1.75
ILQ74 3.40
.92
.92
.92
.92
.92
.92
.92
9300PC
9301PC
9304PC
9306PC
9308PC
9309PC
9310PC
9311PC
9312PC
9314PC
9316PC
9318PC
9321PC
9322PC
9324PC
9328PC
9334PC
9338PC
9340PC
9341PC
9342PC
9360PC
9366PC
2.38
2.38
2.10
2.38
2.10
2.40
2.70
2.70
74LS253 3.05
74LS260 .58
5053 r:e.
5053 1.00
1.20
1.50
6.90
2.50
1.60
1.50
2.30
1.20
1.30
1.50
2.30
1.20
1.30
2.00
2.50
2.95
3.30
5.00
4.10
1.15
1.75
1.75
35
.40
e
5053+_..-
5053
ir
216=
5053=
M V 50
1-AMP
1N4001
1N4002
1N 4003
1N 4004
1N4005
1N4006
1N4007
A
A
.40
40
ge
1/5024
1/5053
$. 30
Ar el
RECTR71 ERS
1®
10
1.00
1000
7.00 60.00
8.00 70.00
9.00 .80.00
10.00 90.00
11.00 100.00
12.00 110.00
13.00 120.00
1.10
1.20
1.30
1.40
1.50
1.60
PHASE -LOCII ED
LOOPS
LM567CM
Mini-JI
1.80
INTERFACE MODULES
29.00
Instr. Amp., Bipolar Input
34.00
Instr. Amp., Bipolar Input
34.00
Instr. Amp., FET Input
49.00
CV 1021
Instr. AmO., FET Input
FET
Input
59.00
CY1021A Instr. Amp.,
39.00
DAC, 10 Bit, Low Drift
CY2137
DAC, 12 Bit, 2 Quad Multiplyleg `49.00
CY2218
69.00
DAC, 12 Bit, Low Drift
CY2237
79.00
DAC.
4
Digit
BCD,
Low
Cost
CY2735
CY3035 ADC, 8 Bit, Sect. Counting,
89.00
Low Cost
CY3635 ADC, 3 Digit BCD, Sect. Court.
19.00
Low Cost
CY1010
CY10
CY1020
2,60
2.30
2.20
2.20
2.25
2.95
3.10
4.10
2.70
2.50
1.00
1.00
1.00
LM305N
LM306H
LM307H
1.25
2.00
1.75
2.00
4.50
3.00
1.20
1.20
.90
.80
1.10
.90
.90
3.50
1.30
1.50
1.50
1.05
1.05
1.00
.95
.75
.95
1.50
1.20
LM3054H
LLM307N
LM308AH
5.00
2.00
1.20
LM308M
1.75
1.95
1.60
1.80
LM309K
LM310H
LM310M
LM311H
LM311D
LM311M
LM311N
LM312H
LM318H
LM324N
1.70
1.90
1.75
2.00
2.70
2.60
1.90
LM 331 N
2.20
LM339N
3.20
2.90
LM320-5K
2.50
LM320-5T
LM320-121( 2.90
LM320-12T 2.50
LM340-05K 2.60
LM340-06K 2.60
LM340-OBK 2.60
LM340-12K 2.60
LM340-15K 2.60
LM340-18K 2.60
LM340-24K 2.60
LM555CM
.90
LM556CN
1.30
LM709CH
.45
LM709CN
.45
LM710CH
.90
LM71oCN
.90
LM711CH
.90
33
LM7116Jv
.90
LM715iH
4.30
4.60
LM715L0
LM723LH
.90
.75
5.00
5.20
1.40
LM723rh
LM72H
LM725L0
LM733DJ-s
LM733C0
3_50
LM733L'lis
1.30
.45
1.25
.44
.70
1.70
.90
2.50
LM7411111
LM741.^.0
LM741.s
LM741-Qh0
LM747=te
LM7470Yd
LM747tb
LM745ilvt
.55
.55
LM748V
LM7777-R
LM77T-Te
2.15
2.10
LM30rC-;
LM305-ir'
.95
1.50
SG450 SG450
2.20
2.20
7.50
LM500IIK
LM335K:
5V, 600nnA 2.30
LM336K: 12V, 500m4 2.90
LM337K: 15V, 450m4 2.90
power
AMPLIFIERS
SI.1010G
SI -1020G
SI -1030G
SI -1050G
504 25.90
BU204 3A 1300V $4.14
BÚ205 3A 1500V 4.95
80206 3A 1700V 5.94
BU207 6A 1300V 5.85
BU208 6A 1500V 6.93
BU209 6A 1700V 8.64
-°
COM2601
104 06.90
20W 9.90
30W 18.70
POWER
TRANSISTORS
USRT
UNIVERSAL SYNCHRONOU.
RECEIVER /TRANSMITTER
from Standard Microsystems
STR, BSC, bi -sync and interleaved bi -syn: nodes
of operation
fully programmable
furi r half
duplex operation fully double buffered sic rattly
TTL compatible high speed operation Isv sower
PRICE:
1 -9
10 up
$30.00
$24.00
Or11Ibf
-
COM25a12
$12.50
MINIMUM ORDER: $10.00
Add $1.00 to cover postage and handling
SEND CHECK OR MONEY ORDER (NO C.O.D.) TO:
California residents add 6% sales tax.
ANCRONA
P.O. BOX 2208R, Culver
25
.30
.30
ILI
HYBRID
XR 215 PHASE-
I
1.35
K POWER REGULATOI'S
12.00
23.00
6.50
6.50
11.40
18.00
2.00
3.20
3.20
5.90
5.60
5.60
LOCKED LOOP
For FM or FSK demodulation,
freq. synthesis and tracking filter application. 5 to 26V from
0.5Hz to 35MHz. Accepts analog signals 300mV to 3V.
nterfaces with DTL, TTL & ECL
1 -24
25 up
d e.
LITRONIX
MM
MM404H
MM405H
MM406H
MM407H
MM451H
MM454F
MM500H
MM506H
MM507H
MM550H
MM551H
MM555H
.25
.30
.30
220 Rao
220 atiesw
220 Cue n
IL12
LM114H
LM300H
LM300N
LM301AH
LM301AM
LM301AN
LM3O1M
LM301H
LM302D
LM302N
LM302H
LM304H
LM305H
7520N
DEMODULATOR
C2102-2
P2102-2
2505K
2512K
2521V
.200r'
MONSANTO
MCT2
a.
216 Res
216 'iblcw
216 Conan
OPTOISOLATORS
74Lß2512.55
7520 SERIES
SENSE AMPS
FM STEREO
MOS-LSI
.160r d
wide viewing angle
5.92
3.02
74LS175 2.90
74LS181 3.72
75107
1
P11014
P110141
1402ÁN
14034 H
1403ÁN
14044 H
,
DISPLAY
a.
209 Ren
$.25
209 1'ea:w .35
209 Càe n
.35
LINEAR Ks
.35
TO -5
--
H=T05 N=DIP M=MINI-DIP D=CER-DIP Is=
SOLDER - TIN
8 pin DIL
.22
14 pin DI
.26
16 pin DI
.29
24 pin DIL .75
28 pin DIL 1.10
36 pin DI
1.70
40 pin DI
1.90
WIRE WRAP -GOLD
14 pin DIL .40
16 pin DIL .45
SOLDER - GOLD
3
-
Package
COMPONENTS
DIL
DIL
TEFLON
-
.125'd
$7.90
1/8" character height
compact, thin PC
74LS76
74Lß78
74LS107
74L5109
74LS112
74L5113
74LS114
74LS138
74LS139
74LS151
74Lß153
74LS157
74LS158
74LS160
74LS161
74LS170
74L5174
K SOCKETS
Price
1.60
2.50
1.60
2.00
3.00
2.20
3.00
1.70
2.20
4.40
9125
EP
LIIDc
pI
9300 SERIES
74LS00
CALCULATORS
áeeáeéeäá
2.00
2.00
74LS
14 pin
16 pin
.87
INTERSIL 8038
PRECISION WAVEFORM
GENERATOR & VCO
16.
DL33
:.
6.00
6.00
6.00
4.00
4.90
9.90
12.00
4.00
6.00
4.00
3.40
2.25
2.35
2.50
Red
Red
Red
Red
Red
Red
Red
Red
Red
Red
Red
Red
Red
DL10
DL10A
QUALITY
L
BIPOLAR
MEMORY
Red
LITRONIX
DL80 Red
DL81
1.49 (Limii!ted44aaO4aty.)
1.49
1.40
1.29
1.35
.80
1.90
.80
2.00
2.09
5.90
1.75
1.75
2.95
1.10
.95
2.55
SLAT
2.25
3.50
3.50
1.60
only original parts, from the world's
leading manufacturers and our customers include
some of the largest and most quality -conscious
companies. Now you can take advantage of our
component buying skills and power and select
from a broad range of advanced circuits.
745181N10.20
745189N 5.10
HIGH SPEED
TTL
.34
.34
.72
.92
.92
.92
1.28
1.50
1.48
1.70
1.78
1.50
2.60
1.55
1.20
1.60
1.30
1.50
1.05
3.20
.75
2.90
2.29
e
OPCOA
SLA1
Red
SLA11 Green
SLA21 Yellow
We handle
LM3544
74H00N
74H01N
74H04N
74H05N
74H08N
74H1ON
74H11N
74H2ON
74H21N
74H22N
.92
74161N
74162N
74163N
74164N
74165N
74166N
74170N
74173N
74174N
74175N
74176N
74177N
74180N
74181N
74182N
74184N
74185N
74188N
74190N
74191N
74192N
74193N
74194N
74195N
74196N
74197N
74198N
74199N
74200N
74221N
74251N
74278N
74279N
74293N
74298N
DISPLAYS
We've been buying and selling top quality components for nearly
ten years, Our annual volume exceeds $3 million.
P1103 $6.20
1.30
$.85
1.30
1.25
.45
.40
PREMIUM
RAM
INTERFACE
DM8820N
DM8820AIN
DM8830N
DM8831N
DM8832N
N8T268
7496N
74100N
74104N
74105N
74107N
74109N
74110N
74111N
74114N
74115N
74118N
74121N
74122N
74123N
74125N
74126N
74128N
74132N
74136N
74140N
74141N
74145N
74147N
74148N
74150N
74151N
74152N
74153N
74154N
74155N
74156N
74157N
74158N
74160N
DECODED
74S74N
74585N
74ß86N
745112N
745113N
745132N
745133N
74S138N
74S139N
74ß140N
74ß151N
74S153N
745157N
LOW POWER
TTL
7444N $1.05
7445N 1.04
7446N 1.10
7447N 1.00
7448N 1.00
7450N
.15
7451N
.20
7453N
.20
7454N
.26
7455N
.37
7460N
.25
7462N
.37
7454N
.37
7465N
.37
7470N
.30
7471N
.49
7472N
.33
7473N
.38
7474N
.35
7475N
.60
7476N
.45
7478N
.55
7480N
.60
7481N 1.19
7482N
.90
7483N
.80
7484N 3.02
7485N 2.50
7486N
.40
7489N 2.40
749ÁN
.60
7491N 1.00
7492N
.84
7493N
.60
7494N 1.20
7495N
.80
READ/WRITE
SCHOTTKY TTL
74502N
74ß03N
LM 331N:
7400N TTL
7400N
7401N
7402N
7403N
7404N
7405N
7406N
7407N
7408N
7409N
7410N
7411N
7412N
7413N
7414N
7415N
7416N
7417N
7420N
7421N
7422N
7423N
7425N
7426N
7427N
7428N
7430N
7432N
7433N
7437N
7438N
7439N
7440N
7441N
7442N
7443N
40814E
.26 .25
45104E 1.98 1.78
45164E 2.88 2.78
45184E 3.28 2.98
45204E 1.88 1.68
49014E
.43 36
49114E
.43 36
.45
.80
.75
.75
.80
.75
.65
.80
.80
.80
.80
.80
.80
OP AMP
$2.20
405646 3.43 3.39
40604E 1.50 1.49
40664E
.90 .89
40694E
.78 .68
40714E
.26 .25
40764E 1.68 1.48
7490ON
1
LOW N015E
City, CA 90230
(
111111I1i1111í{11F
UAW
UNIVERSAL ASYNCHRONO
RECEIVER /TRANSMITTE F
from Standard Microsystem:
1S
Direct TTL compatibility full or half ,.os,>. operation
fully double buffered
fully pre lremmeble
high speed operation
tri-state w ',puts
PRICE:
1 -9
10 up
$13.20
$10.60
SPECIFICATION SHEETS: $.25
L
C
1-
v
(O
ea.
C..71
Circle 73 on reader service c'ard
www.americanradiohistory.com
97
de Quality
Electronic Components
ADVERTISING INDEX
SPECIAL SAVINGS DISCOUNT ON LINEAR AND DIGITAL INTEGRATED CIRCUITS
oe.
Deduct 41 from the ,mol 01 von I.C.
fer 550.011 or ma,. 101 for FIOO.CO on more
,.reeds 115Oì
d n
Adda..
7400N
7401N
...
2& 744661... 81c 7496N... 81c
7402N.. 25c 7447N... 8k 74107 .. 32c
740391... 25 744911.. - 90 74121N .. 3&
74049
7405N
7406N
74079
..
.,. 23c
... 23c
7453N ... 23c
25c
.
... 2.5
... 25c
... 25c
74122N
74519
741239. $1.08
740814... 255 7459N... 255
7409N.. 25c 74634... 23c
7410N.. 25c 7470N... 36c
.
... 25c
74139... 255
7416N ... 25c
7417N... 25c
7418N ... 2k
742061... 255
... 25c
.
74729...
3&
... 325
32c
... 54c
... 36c
7473N
7474N...
7475N
7476N
748EN
45c
74141N .. 99c
74150N. $1.44
74151N .. 90
74153N .. 8k
74154N. $1.44
74155N . . 81c
7415614 .. 81c
74157N .. 72c
7415861. $1.53
74160N. $1.26
74161N. $1.17
7416261. $1.26
7416314. $1.26
74549... 23c
74119
..
745CN
...72c
743814
744061...
... 32c
7486N
7490N...
25c
50c
... $1c
7491N
744114.. $1.17
7442N
65,
749á1...54c
..,
7493N...
50c
40331E. $1.67
4035ÁE.$1.42
4040M. I1.67
4041M .. 92c
4042M .. 84c
30c
4010ÁE .. 67c 4043ÁE .. 67c
4011.4E .. 30c 4044ÁE .. 67c
40124E .. 33c 4046Áe. $2.51
40134E .. 5& 4049ÁE .. 58c
401441E. $1.67 4050Ae - . 58c
4015ÁE.$1.17 405171E. $1.50
40169E .. 63c 40524E .
40176E. $1.34 4053ÁE.$1.50
40184E. $1.67 40606e. $1.67
40196E .. 5& 4066ÁE.$1.00
4020ÁE.$1.67 40716E .. 30c
4021ÁE.51.50 40724E .. 30c
4022ÁE.$1.25 40750E .. 30c
.30
4023Á1
40246E. $1.00
40256E .. 30c
4026M. S1.67
.
LINEAR INTEGRATED CIRCUITS
555V
565A
741V
748V
MINIDIP TIMER
82.5c
$3.38
50.0c
DIP PLL
MINIDIP OP AMP
MINIDIP OP AMP
L129 5 VOLT REG
558V
567V
723A
747A
MINIDIP DUAL AMP
MINIDIP DECODER
DIP VOLTAGE REG
DIP DUAL AMP
L193900 DIP QUAD AMP
1130 12 VOLT REG
42.13c
$1.80
$1.80
L131 15 VOLT REG
..
40756E
4081AE
4082ÁE
..
... 75.0c
82.5c
97.5c
60.0c
$1.80
$1.75
LM309K 5 VOLT REG
-
MINIATURE ALUMINUM
-wc
Out edc tnleren
e
UFD /50V
1k
22500/509
3309D/359
1t
12c <
It
Ile Ilc
13 Ilc
4.7 UID(95v
10100/16V
1k
11
12c
120
It
I2c
12t
1
it
10 615/36
22 UF17n6V
22Úf0/25v.,
,
1
lk Ik
so
ormet..
met..
33610/25V.... 17c
Á500)16V....170
Ilc
Ilc
47
500125V....
tool -to ohm 7ss le., Oro oe lees)
330UFD/I6V... 3k
St
lk 330510/439.. 115 35t 32c
Oren 4.7
33UFD /169....1k
ÌÌc
19c
41
13c
It
I
I
... 2t
18c
I4c
l7c
12c
220 51076V
Sic
220 UFD /259... 35c
25c
24c
l
it
..
470 USW16V.. .37c
Sc
It
Sc
1000FD /16V... IQ Ile
103 UFD /2SV
k
17c.
tIt
1
-
ELECTROLYTIC CAPACITORS
AXIAL LEAD TYPE
n sloe
30
30c
30c
..
30c 27c
39c 35c
39c 35c
606 55c
60c Sk
470500/259. -.455
1000 UF13/169.. 49c
1003 0101259
7k
2200 UFD/16V .. Ile
.
Dc
AMP SILICON RECTIFIERS
1N4001 50 PIV 1241 100 /S6 1000/$48
1N4007 1000 Ply
184005 600 PIV 8 /$1 100/59 1000 /$70
100/$11
1000 /$88
6/51
SILICON SIGNAL & SWITCHING DIODE
104148 (19914 equiv.)
100/57
12/S1
/M/$50
519/5220
MOLEX SOLDERCON IC TERMINALS
500/54.20
100/51
500033890
1000/58.20
50,00015275
LED 7 SEGMENT DISPLAYS
CATALIT -704.. $1.00
.. $1.50
DATALIT -707
MACHINE SCREWS, NUTS 8 LOCKWASHERS
Screw 900c
4-40 'r. Screw . 9 6c/c
6-32 1/4 Screw . 92c /<
8. 323 /8Screw $1.05 /c
2 -56 Hex Nut. $1.45/c
400 Hex Nut. $1.45/c
6 -32 Flex Nut. $1.45 /c
832 Hex Nut. 51.50 /c
2 -56
2.56 'n Screw
4-40 'n Screw
6-32 'V, Screw
'I..
.
6 AMP
8-325 /8
Washer
4 Lock Wachar
6 Lock Washer
8 Lock Washer
.
45c /c
.0022/5009
.0047/500V
.01/500V
.01/25V
.022/25V
.047/259
.1/250
7c
7c
7c
7c
7c
7c
10c
5c
6c
9c
12c
10
tap
5.5c
5.5c
5.5c
5.5c
5.5c
5.5c
7.5c
3.5c
4.0c
6.0c
9.0c
4.5c
4.5c
4.5c
4.5c
4.5c
4.5c
6.3c
3.0c
3.5c
5.3c
7.5c
.52.00
$200
51.50
$1,50
129 52.00
S7.5Á
24V 52.00
$1.50
10
1
8 pin Solder.
14 pin Solder.
16 pin Solder.
18 pin Solder.
24 pin Solder.
3.6c
3.6c
3.6c
3.6c
3.6c
3.6c
5.0c
8 pin
27c
29c
32c
34c
54c
21c
23c
25c
26c
42c
I
10
W.W... 38c
30c
39c
42c
68c
80c
2.4c
2.7c 14 pin
4.2c 16 pin
6.0c 18 pin
W.W.. 50c
W.W.. 54c
W.W.. 88c
24 pin W.W.
.
99c
'A WATT CARBON COMP. RESISTORS
1/2 &
each of the 85 standard
Sorted by volve 512/set 2-4
5 each of the 70 standard
Sorted by value S12/set 2 -4
5
10%
values 12.2-22M)
tes
values (10-5.6M)
are
/set
511
5 -9
'V
W
Resistors (425 pcc.)
W
Resistors (350 pcs.)
243645 ..150105
243646 .- 10-106
243904 .. 10. 92
2143906 .. TD 92
244124 ..10- 92
244126 ..706 92
18.5c
18.55
18.55
16.5e
16.5c
16.5c
16.5c
16.5c
16.0
19.0
1/.5c
17.5c ,_
22c
19.0c
17.55
TO- 98
343394 .150 98
2N3563 .150106
2N3565 ..T50106
225
22c
19.006
20
173c
20
20
16.0
16.0
16.0
245133
2143638 ..TO-105
2143638A . T0.105
17.5c
17.55
17.5c
17.5c
22c
190C
16.0c
20 17.5,
20 17.k
175c
295179 ..100.106
TO 3
293055
...150106
E11930
.
.150106
1N23696..10.106
1112907...T50106
111222
.
2142712
..TD
98
98
3433916 .10233392 .. T0. 98
2143393
..
.
.
293640
..10.106
2143641
.
243643
.10.105
.150105
.
21c
21c
21c
215
215
705
22c
1850
20
18.k
19.0
.I
17.5c
17.55
t
16.0
2N4401
..
T0. 92
..TO-
..
..
2145129
2145134
245137
.
2615138
..10106
.
22c
22c
22c
22c
19.0c
16.0
17.k
17.k
19.0
79.0
17.55
17.ác
w.0c
17.k
225
225
22c
19c
19c
19c
10-106
..10-106
..10.106
17.k
22c
92
..T0. 92
245089
10- 92
2144183
2145087
READER SERVICE CARD NO.
19.0.
19.0
19.0
17.50
17.5c
17.k
17.k
15.0
15.0
19.0c
I9.0
17.0
17.ac
15.0c
15.50
17.Oc
IV
17.0
19c
79c
17.05
17.05
01.00
95.0
10.106
la
201
22c
15.0
15.05
85.Oc
FIELD EFFECT TRANSISTORS
7A09102
.
T0. 92
44
.380
350
295457..
40- 92
47
420
.375
NPN DARLINGTON TRANSISTOR
MPS-AI3.
Send
1O-
92
Min. DC
Carent Gain of
S.
Si IOmA.
36
320
.290
for Free Catalog or Mail Readers Service Card
COD ORDERS ACCEPTED FOR SAME DAY SHIPMENT
CALL 218-681 -6674
Orders Less Mm 510.00 odd 50 Service Charge- Others Postpaid
01111 Q115d/n r,
1,1,111.11rn
.NOIX"-
DIGI -KEY CORPORATION
P.O-
98
Be: 126
MARKET CENTER
are S10 /se1.
SILICON TRANSISTORS
10918
Allison Automotive
82
A.D.R. Audio
86
16
B & K Division of Dynascan Corp.
28
Bell & Howell Schools
78 -81
62
Brooks Radio & TV Corp.
83
72
Castle TV Tuner Service Corp. Cover IV
Channellock
18
66
17
CIE, Cleveland Institute of
Electronics
54 -57
Continental Specialties Corp.
8
16
CREI, Division of McGraw -Hill
Continuing Education Center
36-39
20
Delta Products Corp.
67
21
Edlie Electronics
68
Edmund Scientific Co.
71
100
24
EICO, Electronic Instrument, Inc.
70
EMC, Electronics Measurement Corp. 77
68
Fordham Radio Supply Co.
86
66
Grantham School of Electronics
85
GTE Sylvania Electronic Components
2
Heath Co.
100
Cover III
27,28 Hickok Electrical Co.
71, 76
ICS, International
Correspondence Schools
18 -21
67
Indiana Home Study Institute
86
12
International Crystal Mfg. Co.
25
61
Lectrotech, Inc.
82
9
MITS, Micro -Instrumentation
17
Telemetry Systems, Inc.
71
26
MTI, Motorola Training Institute
Mountain West Alarm Supply Co.
84
65
National Camera Co.
25
68
National Technical Schools
72 -75
NRI Schools, Division of
McGraw -Hill Continuing
Education Center
8 -11
64
PA IA Electronics
84
Cover II
PTS Electronics
7
Radio Shack
15
63
RCA Distributor and
Special Products Division,
Test Equipment
84
1
RCA Parts & Accessories
13
5
RCA Solid State Division
70
RGS Electronics
86
22
Schober Organ
69
10
Shure Bros.
22
13
Southwest Technical Products
23
Sprague Products Corp.
4
7
Telematic
26,
27
14,15
19
67
Teletronics Company of America
Tri -Star
29
76
Tuner Service Corp.
5
3
TV Tech Aid
23
69
77
Vintage Radio
6
Weller-Xcelite Electronics Division
Thief River Falls. MN 56701
Use wttf your present 0s5,11oscope to trace
Resistors. Capacitors. Transformers. DOodes.
I,antiStarS, Zeners. Tno stars. II ost Senncon
doctors. IC's. etc.
Aise shows continuity. In
30
69
are S11 /set S9 are 010 /set.
10%
PAGE
I 1
I.C. SOCKETS
toa
MULTITRACER
READER SERVICE CARD NO.
I
la
5V
6V
45c/c
45c /c
.
019.0.
1
411
.35 /c
45c /c
2 Lock
PST 14.0.
CONTACTS
8&/c
.
DISC CAPACITORS
100 pf /500V....
220 pf /500V....
470 pf /5000....
.001 /500V
REED RELAYS
9&/c
96c/c
.
NEW INSTRUMENT TO USE WITH YOUR SCOPE
A
4034AE. $3.34
.. 67c
4009AE
.. 50
40304E
40084E. $1.17
.
.81c
7494N
..
4007AE
7416514. $2.45
7416664. 02.00
74175N. $1.00
74180N .. 8k
7418114. 12.25
741834
90c
741929 51.26
74899..$4.47
40290E.$1.42
4006ÁE.$1.50
748214...72c
742391... 72c 74834... 72c
742601... 2k 7485N.. $1.40 74164N. $1.35
... 25c
... 25c
... 25c
67c
4028AE. $1.09
74198N. S275
7419961. 52.75
40004E .. 30c
4001ÁE .. 30c
4002AE .. 30c
.
7430N
7437N
RADIO -ELECTRONICS does not
assume responsibility for any
errors which may appear in the
index below.
II.
looted on single lot ornes.
offered.
numb boum,
w9e
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... 25, 7445N ... 8k 7495N... 90 74193N.CIRCUITS
$1.17 4027AE ..
SUMMER $pecials -ICM 8038 function gengerator $3.50. Mostek MK50250 1ebeeper"
6 -digit alarm clock IC $5.95. Jumbo 0.6"
747 LED display $1.95. 0.33" 707 display
85c. Solar cells, 2X2cm, 0.5V @ 50mA,
only .020" thick! $1.50 each, 10/$9.95. Bargain catalog 25c redeemable. DIAMONDBACK ENGINEERING, P.O. Box 194, Spring
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PAGE
97, 99
Ancrona Corp.
98
ATV Research
92
75
Babylon Electronics
88
Command Productions
94
Cornell Electronics
92
Delta Electronics
76
Digi -Key
98
77
Electronics Warehouse Inc.
94
Bill Godbout Electronics
90
79
90
Gunmaster
International Electronics Unlimited err 93
78
80
James Electronics
95
Lesco Electronics
98
83,84 Meshna Electronics, John Jr.
92, 96
New-Tone Electronics
82
96
Photolume Corp.
90
88
85,86 Poly Paks
89, 91
Processcor Technology Co.
94
87
96
81
R.A.G.S.
Saxitone Tape Sales
94
94
89
S.D. Sales Co.
Solid State Sales
90
90
Sphere
88
Trumbull
90
73,74
Circle 77 on reader service card
www.americanradiohistory.com
cuit and g0 /no.go Checks
diamms and instructions.
connections
foi hobLilst.
On
-
BOX
" ham.
Complete wdh
No internal scope
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ONLY 5 /9.95-CHECK OR MONEY ORDER
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NAME
STREET
CITY
_
-
STATE_.
_
....ZIP
HOW MANY ATTENDING
NATIONAL
ELECTRONIC
MESI A
SERVICE
DEALERS
ASSOCIATION,
1715 EXPO LANE
INDIANAPOLIS, IN 46224
INC.
J
SP8641A
LINEAR INTEGRATED CIRCUITS
1.24
GENERAL PURPOSE AMPLIFIERS
4.01
SL2018 GP emphf iii
1.87
SL201C GP amplifier
MATCHED NPN TRANSISTORS
2 72
SL301A Matched pair
2.30
SL3018 Matched pair
5.7
SL303A Matched triplet
193
SL303B Matched triplet
7.37
matched
pairs
SL3058 Dual
SL312B Matched pair w /tail 2.85
4.22
SL354B Matched quad
SL360C 2.5G1Z matched pr. 1003
SL362C 2.5GHt low noisepr. 16.26
2.77
SL3045C Transistor away
SL3145C 2.5GOz trans, array 1478
2599
100
151
101
1
64
2.46
2.01
SL623C
1.40
1.72
SL624C
SL630C
SL640C
SL641C
SL645C
SL6508
SL650C
478 4.09
143 293
6.44 5.52
2.56 2.27
170 3.17
9.56
8.18
14.20 12.14
2.43 2.09
12.94 11.09
AUDIO CIRCUITS
SL414A 3W audio amplifier 4 22 3.70 3.17
049 4.81 412
SL415A 5W audio amplifier
POWER CONTROL CIRCUITS
Power control circuit 5.49 4 81 4.12
SL440
TRANSISTOR ARRAYS
SL3046 Five transistor array 1.85 1.61 1.37
LINEAR RF AMPLIFIERS
S
L501 A
515018
SL502A
SL5028
SL503A
SL5038
SL551A
RF amp....
RF amplifier
RF amplifier
RF amplifier
RF amplifier
RF ampli f ier
RF amplifier
RF amplifier
RF amplifier
RF amplifier
RF amphi ier
RF emphf ear
84 14.44
5.17 4.44
19 25 16
5.91
1455 1104 11.54
388 3.49 109
16.50
4.12
18.82
5.89
18.82
5.89
21.09
6.28
9.79 8.40 SP10068
SP10078
600 4.28 SP10086
138 2.90 SP10098
6.60 5.65 SP10108
6.60 5.65 SP10118
6.60 5.65 SP10128
9.31 7.76 SP10238
5.83 486 SP1039B
10.34 8.62 SP 12048
61651B
684 5.40 SP 12058
SL651C
SP 12068
OPERATIONAL AMPLIFIERS
7.13 6.23 539 SP12078
SL7018 Op. amplifier
3.56 3.12 2.67 SP12080
SL701C Op ampld i.r
7.13 6.23 539 SP12098
SL7028 Op ampliliar
3.56 3.12 2.67 SP1211B
SL702C Op. amplifier
10.35 9.06 7.76 SP12238
SL717A Dual comparator
6.57 5.76 494 SP12398
SL717C Dual comparator
8.37 7.50 6.63 PECL III
517518 Op. emphf .r
4.81 430 180 SP16608
SL751C OP. moldie,
SP 16628
TELECOMMUNICATIONS CIRCUIT
SL1001A Linear mod /demod. 3.22 283 2.43
SL10018 Linear mod /demod. 3.22 2.83 2.43 SP1664B
7.15 6.26 636
SL1020A Lin amp remora DC
1.40
SAA570 Limit IF aria /FM det 4.22 4.22 3.30
SAA661 Limn. IF aK/EM des 4.73 473 170
10.14 10.14 7.92
SAA700 Signal processor
SL551B
10.14 10.14 7.92
1687 1492 S8A550 Signal processor
SL552A
IF erro/FM lot 4.73 4.73 170
528 467 SBA750 Limit
SL5528
IF amp/FM OK 4.73 4.73 170
Limit
SL432
18.9016.71
SL553A
13.52 13.52 10.56
5.62 4.96 SL437C IF & AGC for
SL5538
PNP tuners
R F dat & v Idao amp 25 34 22.18 19.00
S L510C
for
13.52 1152 1056
SL511C RF cet & video amp 25 34 22.18 19.00 SL43713 IF b AGC
NPN tuners
LIMITING WIDEBAND AMPLIFIERS
Switch mode power 9.24 7.92 6.60
27.72 24.26 20.80 SL442
SL521A Limning RF amp
supply control
17.58 15.58 13 57
RF amp
SL521B
Power sup &Syr sop 11.09 9.50 7.92
10.59 9.27 7.95 SL450
SL521C Limiting RF amp.
TV IF system
7.39 634 5.28
37.80 3308 28.35 SL456A
SL571A Limehng RF amp.
7.39 634 5.28
23.39 20.46 17.53 SL45613 TV IF system
SL571B Limiting RF amp.
7.39 634 5.28
SL457A TV IF system
17 48 15 29 13.09
SL571C Limiting RF amp
7.39 634 5.28
system
SL525C W ideband ampliliar 580 520 4.60 SL57B TV IF demodulator
10 14 10.14 702
Color
17.58 15 58 1157 SL9O1
SL530C Logarithmic amp.
decoder
1152
13.52 10.56
Color
SL917
SL550C 200MHz wideb6 Ono 26.19 21.81 18.16
SL1030C 200MHz witlebb .n x29.57 2087 22.18 DIGITAL INTEGRATED CIRCUITS
RADIO COMMUNICATIONSCIRCUITS
1.24 25 -99100 up
Dweription
407 3.56 3.06 PROCESS CONTROL CIRCUITS
SL610C RF ampliliar
4.07 3.56 3.06 SP520
SL611C RF amplifier
Gray code counter 1194 12.49 11.04
407 356 3.06 SP521
SL612C IF amplifier
Binary rate multip. 1194 12.49 11.04
8.66 758 6.49 SP522
SL613C Limiting amp /cet
Phase loçdrz.& corn. 1194 12.49 11.04
6.15 5.39 4.62
SL620C VOGAD
SP1000 SERIES
6.15 5.39 4.62 PECL II
SL621C AGC generator
1.48 1.25
10048
Dual 4 15 ORNOR own 1.71
SP
11.1
w/VOGAD
15.21
1131
AFa
SL622C
1.48 1.25
SP 10058 Dui 4 PP OR/NOR lase 1.71
h materne emninier
3.70 127
16.87 14.92
5.28 467
L''"0
-
XH
XR
XR
XR
XR
XR
8101
8102
C101
C102
XR 5200
XR 205
XR 205K
XR 210
OR 210M
XR -215
OR 320
OR 555CP
KR -556M
KR556CN
OR
OR
K
R
556CP
567M
567CN
567CP
131CP
1310EP
1468CN
1468CP
1468N
OR
OR
OR
OR 1488P
OR 1489AN
oR- 1489AP
OR 1568M
OR 1568N
OR 1800P
25173
25178
25293
252938
25321
25327A
2N334
25336
25338A
2N389
25393
253988
25404
25417
75420
25424
25439
25443
25456
25497
25501A
25508A
255128
25555
25586
2N594
25630
25652A
25677C
25681
25682
25683
25685
25686
75689
75697
2N700
25705
25706
257068
25711
2N7118
2N71BA
25720A
25741
25744
25759
25759A
25760
219760A
25829
25834
75859
3.50
150
3.50
150
3.50
3.50
3.50
3.50
3.50
150 3.50
150 150
Diffused resistor array
150 150
Diffused & pinch resit. array
150
3 50
Bal. mod. &NPN PNP cur. source 150
Multifunction IC
28.00 2100 21.00
7.35
8.40
Waveform pen. IC
Waveform gon. kit
25.00 25.00 25.00
455 3.90
5.20
FSK mod. demod.
9.10 7.80
10.40
FSK mod. demod.
656 5.74 4.92
Gen. purpose PLL
1 33
1.14
1 52
Timing circuit
94
.80
107
Timing circuit
7.92
1056 9 24
Dual timing circuit
2.16
2.88
2.52
Dual timing circuit
1.37
1.82
1.60
Dual timing circuit
12.96 11.34 9.72
Tone decoder
1.61
1.38
1.84
Tone decoder
1.47
1.26
1.68
Tone decoct.'
2.80
2.40
Stereo demod.
3.20
2.40
3.20
2.80
Stereo demod.
288
3.84
3.36
±5V tracking VR
1.91
±5V tracking VR
2.54
2.23
4.32
5.04
6.76
Quad line driver
5.20 4.55 3.90
Cued line driver
480 420 3.60
Quad line roc.
rec.
line
4.32
3.78
3.24
Cued
14.32 12.53 10.74
±15V track. VR
540
±15V track. VR
7.20
6.30
240
2,80
Stereo decoder
3.20
NPN array. pwr.&oehottky
C103
XR -C104
XR C105
XR C106
OR
OR
OR
1-9
10 up 100 up
$80.00 $80.00 88000
3.50
3.50
3.50
3.50
3.50
3.50
OR chip oust. IC des. kit
NON trans. array. sm. sig.
PNP array
NPN array. sm. sig.
PNP array, lat. & subs.
100K
2.15
1.00
.60
.65
.50
1.40
1.40
1.00
1.25
9.00
2.70
1.00
.20
.60
1.20
9.00
1.00
1.15
1.30
1.40
400
.40
2.90
.60
1.00
1.50
150
1.00
5.50
2.00
2.50
2.70
3.40
400
7.00
.25
4.00
.60
.20
.40
.40
.60
.30
50
1.60
.35
1.00
1.00
,50
.70
3.00
.35
5.00
25877
2N894
2N918
25956
2.50
2.00
40
40
.50
.50
2N960
25962
25967
50
25981
2.00
25984
100
2510158 16.00
2N1016818.00
1.50
2N1026
2N1035
2.00
251136
1.50
251137A 2.00
251142
220
251143
2.00
251168
.75
251204
1.50
251234 15.00
2N1302
.30
251305
.35
2N1377
1.50
2N1404
2N1408
251420
251483
251485
251523
251534
50
.60
.50
1.20
1.60
2N1551
5.00
1.00
1.10
3.50
.90
1.35
4,00
2N1554
251557
1.70
2N1540
251543
251544
251549
251552
251560
251595
251596
251597
251598
2N1599
251605
2N1613
2N1671
251693
251711
251715
251720
251899
251907
400
200
130
1.50
1.60
2.20
2.00
2.30
.45
.50
2.00
15.00
.50
.70
5.00
69.00
5.00
251921
251924
251934
2N1990
252060
100
1.30
9.40
.80
2.10
2N2065A 1.80
2N2080 5,00
2520818 2.50
2N2100
2N2102
252148
252192A
2N2193
2N2193A
252218
2522186
2N2219
100
.50
.70
.66
.45
90
26
.30
30
2N2219A .38
25
252221
26
2N2221A
252222
.24
2522226 .30
1.10
252259
.40
252270
2N2289 3.70
2N2290 6.00
2N2297
252322
2N2323
2N2324
252325
252326
252327
252328
1.00
1.80
1.90
2.40
2.60
3.40
4,60
600
252329
7.00
252356 6.00
2N2356A 700
252359 16.00
2N2368
30
252369
.20
252382 450
2N2440 3.50
252453
2N2465
2N2475
252476
252484
252511
252518
252526
252527
252537
2N2538
3.00
7.50
.60
.80
.25
1 50
6.00
4.50
5.50
1.30
2.50
2N2600
2N2604
2N2605
252646
2207CN
22085
XR-2208C5
1.86
1.86
1.86
1.86
1.86
Oued 2 I/P NOR gate2.17
Good 4 I/P clock Oriv.3.50 3.00
PECL to
logic vara 7.60 651
SP1600 SERIES
Dual 4 I/P yate Hi Z 15.00 12.00
sad 2 PP NOR yate 16.50 13,20
HiZ
Oued
SP8600A
SP8600B
SP8601A
SP8601B
SP8602A
SP86028
SP8603A
SP86038
5P8604A
SP86048
SP86078
SF86138
SP86148
SP86158
SP86168
SP8616D
-
150MHz
150MHz
2 at 500MHz
- 2 at 500MHz
- 2 at 400MHz
72 at 400MHz
- 2 at 300MHz
- 2 at 300MHz
- 2 at 600MHz
-
252903
2N2904
2N2904A
252905
2N2905A
252906
2529066
252907
2N2907A
252913
252914
2N2916A
252925
252926
252947
2N2949
2N2950
252969
-4
at
-4
at
700MHt
-4 at800MHz
900MHz
1000
- 4 at 950MHz
- 5 at 400MHz
- 5 at 300MHt
- 5 et 200MHe
710 at 600MHz
10 at 550MHz
- 10 at 500MHz
- 10 at 400MHz
-fat
SP862013
SP86218
SP86228
SP86308
.50
.70
.60
1.00
4.00
.30
.36
.32
.34
.18
.20
.20
.30
.90
1.40
4.05
.20
.15
14.50
6.00
6.50
31.00
7
-
11
5P8685Á -1411 at 500MHz 116.2099.6087_0
SP86858 - 1011 at 500MHz 35 00 3000 2520
SP8690A - 1011 at 100MHz 63 00 5400 4520
SP8690B - 10/11 at 100MHz 19.60 16 80 1420
MNOS NON -VOLATILE MEMORY ELEMEN'S
1
NOM201C Single MNOS trans
4.44 380
NCM202C MNOS transistor pr
7 39 6.34
NOM204C Quad MNOS trans
12.94 11.09
NOM401C 808 MNOS array
33.26 28.51
INTERFACE CIRCUITS
SP701A MO6 analog tench ów14.15 12 38 10_
SP701 B MOS asebg switch ów.10.56 9 24 7.42
45.92
31.78
25.13
69.82
58.80
SP8631 B
SP86328
SP86348
SP86358
SP86368
SP86378
SP8640A
253107
253109
253117
253130
2N3133
2N3202
253209
253227
2N3239
2N3247
2N3250
253371
253375
253390
253393
2N3398
253442
2N3445
2N3467
253468
253500
2N3501
.80
.75
100
5.00
.80
16.00
.90
2.40
3.00
190
.50
4,00
5.50
50
20
25
2.20
5.00
2N3502
10 /11 1ECLI at
$11.20
10.24
616
5.12
15.44
7.76
672
480
184
17.76
8.88
7.92
253503
2N3506
253544
2N3548
253549
253553
253563
253564
253565
253567
253568
2N3569
253584
2N3599
2N3614
253616
253617
253634
253638
253642
253643
253645
2N3646
253656
253657
40
1.60
7.50
1
4.00
2.80
3.00
1.80
.15
.14
.18
.19
.30
.17
1.80
38.00
1.10
1.25
2.50
8.00
.18
.19
.14
.15
.10
5.60
5.20
7.57
688
19.52
8.80
7.20
6.24
480
1056
152
8.60
9.00
253693
2N3694
253702
2N3705
253707
253710
253711
2N3725
2N3730
253731
2N3740
2N3763
253771
253772
SP7038
12
99
9.80
0
8.96
5.39
7
1151
6.79
5.88
4.20
11
15.54
7.77
1332
6.93
4.90
5.94
4.20
448
136
455
662
602
17.08
7.70
6.30
5.46
420
9.24
108
40
68
4.62
58
5 82
666
190
668
616
14.64
6.60
5
40
468
3.60
7 92
264
2N3843
2N3856
2N3865
SP7048
SP721B
SP7218
SP7228
SP7228
SP7228
SP723B
SP72413
253924
253925
2N3945
1.20
5.00
2.20
2.30
2.40
3.00
.30
.25
7,00
1.10
.20
.22
.20
253957
2N3958
2N3964
253971
253972
254012
254037
254045
254093
25120
254124
254126
2N4141
1
.22
.80
150
480
1.60
1.40
1.10
1.00
1.40
10.50
.70
1.95
1.05
3.90
.20
.26
.26
.17
.16
254142
254143
254208 2.05
2542206 1.00
254225
3.80
2N4226
3.95
2N4234
2N4235
1.50
1.90
.17
.18
,22
.34
.35
.50
254227
254228
254248
254249
2N4250
2N4258
254291
254293
254303
254341
254347
25348
254352
25356
254395
254399
2N4400
254401
254402
254403
254416
254429
254430
254441
254442
254443
254852
254858
254859
2N4863
254870
2N4878
.35
.50
www.americanradiohistory.com
9.24
12.94
7.23
11.09
7.23
11.09
8.24
`
1173 12.01
11.83 10.35
16.47 1441
30.1 26.61
37.83 3111
30.41 26.61
37.83 3111
183216.0
?_
14 78 12 94
up'
10
0
.0
b
II
SILICON GATE
-24
$16.80
14.40
16.00
.30
1.35
1.60
2.00
2.00
.30
1.30
6.40
.30
.32
34
.40
90
6.00
8.60
95
1.10
1.40
.80
1.10
1,20
5.50
.60
3.90
100 up
$14.0/1
25 up
$21.00
254890
.90
1.10
254905
2.00
2N4898
1.00
255016 12.80
255036 1.18
2N4922
2N5061
255064
2N5086
2N5088
2N5089
2N5105
255127
.32
.48
.30
.40
.46
3.10
.16
.20
.16
.16
255130
255133
255138
255154
255157
255198
255202
255294
255306
255354
7.10
9.90
4.30
2.20
255397
2.90
2N5369
.70
.27
.30
.25
12
255407
255409
255414
255449
255453
255457
255458
255467
2N5562
2N5563
255636
2N5637
255655
255657
255679
255742
255778
255923
256027
256028
011
29
32
C
OC
E `_[
5.0(
.40
.4
32.00
12.513
9.00
13.!0
27.00
.E6
1.20
1.40
/1.00
!6
12.60
SD
.E6
2N6076
256099
256101
256103
256155
O
.85
,E5
r.0
1.50
FREE
"Store Opening Special"
Audio Amplifier
LM354A (2.80W)
Bring this coupon to our new electronic pars
outlet for your Fran Audio Amplifier. Lim,1
one per coupon. (Not retlwmable by mai
Offer good until 8/1/75. Ancrons Corpora
Lion. 11080 Jefferson Bled., Culver City. CA
P.O. BOX 2208R, Culver City, CA 90230
Circle 74 on reader servire curd
TTL ariver
TTL driver
TTL drive.
TTL driver
Dual TTL driver
Dual TTL driver
Current comparator
Current comparator
Current comparator
Current comparator
MOS atslogaw0dtów.
MOS analog avndtbw
10,56
14.78
8.26
12.67
8.26
12.67
9.40
IF YOU DON'T SEE WHAT
YOU NEED, LOOK FOR OUR
ADDITIONAL FULL PAGE AD
IN THIS ISSUE
Add $1.00 to cover poop* and handling
SEND CHECK OR MONEY ORDER INO C.O.D.) TO:
California residents add 6% toles tax
SPECIFICATIONS SHEETS S.25 EACH
logic& dock biv.
MOS logic& dock biv.
Balanced line driver
Balanced line driver
PADS
N- CHANNEL,
EA 1500AJ
EA 1500ASJ
2.70
2539556 3.20
2.00
2
1024 BIT READ/WRITE RANDOM ACCESS MEMORY
2N3955
.20
.18
.36
1.50
9.24
ELECTRONIC ARRAYS
.90
5.00
253954
2N3954A 5.50
17
1603
1
MOS logic d dodt dry..
1.9
2N3909
.22
18
.25
I
147812041129
14. 15 12.38 10 18.32 1003'
COM2502
$13.20810600
COM2502P
8.00
6.85
Universal
COM2017
13.20 10.60
asynchronous
COM2017P
receiver
000 6.85
COM2502H
transmitter
25.00 20.00
COM2017H
25.00 20.00
COM2601
Univ. sync. rec. /trans.
30.00 24.00
COM5016
Dual baud rate gen prop. die. 12.00
9.60
Keyboard encoder ROM
KR2376ST Keyboard encoder ROM
20.00 17.50
K R3600 ST 10 channel multiplexer
2000 1750
NMX5010 10 channel multiplex.'
12 00
9.60
CAL 1022
60 00 52 00
12 digit print cal. t«l chip
MOS /LSI circuit
253906
.21
MOS logic &clod( óiv. 18.32
MOS logic& dock drw. 10.56
11
STANDARD
MICROSYSTEMS
184
5.04
3.60
2.88
MOS logic driver
14.15 12.38
10.56 9 24
MOS logic driver
MOS logic& dock òw. 14.15 12.38
MOS bec& dock& iv.
SP704A MOS logic& dock ów.
SP7038
SP751B
253773
253789
253793
.25
2N3796 3.00
253799
3.20
253805 10.50
253807
480
253819
.30
253823
.70
253680 600 253866
253684
1.25 253903
4.00 2536856 1.50 2N3904
2N3905
680 253692
.20
MINIMUM ORDER. $10.00
1.50
1.90
SP703A
SP7246
SP7408
SP740B
SP7418
SP7418
14 928 5P751A
200MHz
C?NJALIITJ
1.50
2N3022 18.00
253053
.35
.80
2N3054
2N3055
95
253060
3.00
253066A 1.20
1.30
253070
SP703A
11
42.00
200MHz
TRANSISTORS
253019
SP70213
-
5120
M70 etHz 81.20
- 10(BCD)
10I8C01 or 6133 MHz 70.00
SP86408
I
SP702A
- 1O IBCOI4 5CONAHz 60.20
- 1018C01 A 400MHz 5040
- 10/11 IECLI at 28.00
-
SP863013
.
39.36 32.80
27 24 22.70
21.54 17 95
59.84 49.87
50.40 42.00
45.60 78.00
3600 30.00
69 60 58.00
60.00 50.00
51.60 4100
4120 36.00
24.00 20.00
PREMIUM
1.80
9.80
-
81.2069.605800 SP704A
7420 63.60 5100 SP7048
Dual
Duel
Dual
Dual
7.10
670
-
25.20 21.60 1800
11.06 9.48 700
1696 1368 11.40
10.08 864 7.20
95.00 81.43 67.86
26.82 22.99 19.16
71.68 61.44 51.20
20.29 13.39 14.49
3458 29.64 24.70
15.40 1120 11.00
4099 3614 29.28
49.00 42.00 35.00
56.00 48.00 40.00
67.20 57.60 48.00
4 at 250MHz
at 250MHt
$18.95
XR-2206KA FUNCTION GENERATOR KIT
Includo, monolithic function generator IC, PC board, and
assembly instruction man.l.
528.95
XR2206K8 FUNCTION GENERATOR KIT
Sams as 8R 27000 A :iti00a .tan .n, gnat external components
for PC board
252715
252716
252754 9500
252802 9.80
252808 9.00
252833
4.00
252880 11.00
252890
4.60
-
16.50 13.20 11.00
OR yate
2.80
2.40
555 tam.
3.20
16.94 14.83 12.71
567 tone decoder
7.90
6.92
593
567 tone decoder
5.18
454 189
567 tone decoder
The Function Generator Kit features sine. triangle and square
t, TOD 0.5% typ.. AM /FM cepabihty.
2N2713
2N2895
215
-4 at
-4 et
Duel 555 timer
XR 2556CN
XR 2556CP
OR -2567M
XR 2567CN
OR 2567CP
.25
.30
.15
.18
.18
252894
t
-
XR- 2208CP OP. multiplier
XR 2211CN FSK demod. /tone deco..'
XR- 2211CP FSK demod. /tone decoder
Prop. timer /atr.
XR 2240M
Frog timer/cp.
OR 22405
Frog timer /ctr.
XR 2240F
XR2240CN Frog. timer /ctr.
AR2240CP Frog. timer/cu.
XR2556M
Dual 555 timer
4.00
7.00
2N2892
2N2893
1.48
Duel 4 PP OR/NOR Boa 2.17
Triple 3 I/P NOR yate 2.17
Triple 3 I/P NOR 90,2.17
Triple 3 1/P NOR gate2.17
Op. multiplier
Op. multiplier
Op mutual r
Op. multiplier
XR.220811
2N2648
252658
252708
252712
148
P
VCO
VCO
VCO
VCO
VCO
XR.2207CP
XR 2208M
XR
1.71
1.71
1.71
2.80 2.40
PECL to sat. logo bas 607 5.20
Dual 4 P OR/NOR gate 2.17 1.86
1.86
Duel
14' ORNOR BM 2.17
Monolithic tuna. gin.
Monolithic fund. g.n.
Monolithic tuna. gen.
Monolithic fund gen.
XR 22065
OR 2206P
OR 2206CN
XR- 2206CP
XR -2207M
XR 2207N
XR 2207P
OR
1.48
1.48
1.48
1.48
1.48
OR/NOR gate 1.71
Quad 2 I/P NOR yate
Quad 2 I/P NOR yate
Quad 2 I/P NOR yate
Dual 4 I/P clock Orlo
FLAT PACK
EXAR ICs
1/P
Triple 3 I/P NOR gate 1.71
Triple 3l /P NOR gate 1.71
Triple 3 I/P NOR yate 1.71
32.20 27.60 2320
SP8641B 7 10/11 (EGLI at
19 04 16.32 13 30
250MMz
10/11 IECLI at
58.80 50.40 4220
1.25 SP8642A
1.25
300MHt
25.20 21.60 1820
1.25 SP86428 7 10/11 (ECLI at
1.25
300MHz
1.25 SP86438
10/11 (ECU at
3600 3000 .' O
1.25
350MHz
7000 6000
1.25 SP86508 - 16 at 600MHt
16 at 500MHz
5120 4660 ..
2.00 SP86518
4.33 SP86528
16 at 400MHz
42.00 3600 3C_
1.55 SP8655A 32 at 100MMz
63.00 5400 452
1.55 SP86558 - 32 at 100MHz
21.0018.001`
1
55 SP8657A - 20 a1 100MHz
63.00 5400 4
1
55 SP8657B
20 at 100MHz
21.00 18.00 '
_
1.55 SP8659A
16 at 100MHz
53.20 4660 !
1.55 SP86598
16 at 100MHz
18 90 16.20 '
1.55 SP86658 - 10 at 1.OGOt
98.00 8400 /
2.50 SP86668 - 10 at 1.1G14.
107.80 92.40 :
5.42 SP86678
10 at 1.20I1z
119.00 102.00 y
SP86708 -8 at 600MHr
630054.004
49 00 42.00
10.00 SP8671B - 8 at 500MHz
37 BO 32.40 7, O
11.00 SP86728 - 8 et 400MHz
Hi Z
27.00 21.60 18.00
SP16708 Single D F/F Hi Z
SP8000 SERIES HIGH SPEED DIVIDERS
control
TELEVISION CIRCUITS
14 78 13.07
Dud 4
AM oat. /AGC amp/ 11.19
SSO demod.
Mun inioda lot AF amp 5.70
3.85
AF amplifier
Dbl. bal. modulator 7.55
7.55
P.e.,C.'muer
7.55
Square law 0.vice
Mod. !phase loc. loop 10.86
Mod. /pha. loc. loop 680
Mod. /phase loc. loop 12.06
Mod. /photo loo. loop 7 56
- 10/111ECLlat
250MHz
PLESSEY SEMICONDUCTORS
up
t.
C
Co
V
N
99
WHEN YOU COME RI PHILADELPHIA BE SURE TO SEE
FREE BICENTENNIAL LIGHT SHOW
LIVE IN THE WORLD
OF TOMORROW ...TODAY!
IN BARRINGTON
MINUTES
AWAY AT
Authentic English hand -crafted model
made of heavy -gauge metal, powered
by steam so you can run it forward,
backward, regulate speed, pull other
models, lock roller and run engine
independently. Just set steering or
use the 12" extension steering rod
and drive it yourself! The fun even
includes a traditional black chimney for the exhaust, which
can power the mighty whistle. To run, fill the safe vaporizing
spirit lamp w'wood alcohol (not inch.
-
A BETTER LIFE
STARTS HERE
No. 71,934 EH (4 lb.; 101 ax6x7 ")
3- CHANNEL
COLOR ORGAN KIT
$35.00 Ppd.
TOTAL KIRLIAN
PHOTOGRAPHY SET
low -cost kit needs no
Explore "aura" photography w/
superb new self -contained Kirlian
Electrophotography Research Unit.
Terrific value
introduced at
technical knowledge. Completed unit
has 3 bands of audio frequencies to
modulate 3 independent strings of
colored lamps (i.e. "lows" -reds, "middles"-greens, "highs " -blues. Just connect hi -fi, radio, power lamp etc. &
plug ea. lamp string into own channel (max. 300w ea.) Kit features 3 neon indicators, color intensity controls, controlled
individ SCR circuits; isolation transformer; custom plastic
housing; instructions.
-
$99.95 ($140 in Sept.)! Has every-
thing but vinyl photo changing
bag. Ideal for color or b&w 35mm,
sheet or Polaroid film for photos
up to 5x7" all without camera or lens. Variable voltage 12v
to 32kv. Ultimate safety design-fully encased in plastic;
patented electronics. Instrs.
No. 72,104 EH (3x5Yhx77/e ")
$99.95 Ppd.
$18.95 Ppd.
Stock No. 41,831 EH
$6.50 Ppd.
No. 42,240 EH (CHANGING BAG)
AM RADIO FITS IN /ON YOUR EAR!
LOW COST
7X INFRA -RED VIEWER
Wear it inconspicuously everywhere, listen as you work (lawn,
yard, office), watch (game, beach)
or wait. Instant music, news,
sports. No gimmick
6/10 oz.
technological wonder w/ integrated
For Infra -red crime detection surveillance, Security system alignment, I.R. Detection, laser checking, nite wildlife study, any work
req. I.R. detection & cony. to visible
-
spectrum. Self cont. scope w /everything incl. I.R. light source. 6v
or 12v power, 6032 I.R. converter tube, f /4.5 objective lens,
adjust. triplet eyepiece. Focuses from 10' to infinity.
$275.00 Ppd.
No. 1659 EH (11x141/4x3 ")
WITHOUT LIGHT SOURCE
$225.00 Ppd.
No. 1648 EH
circuit, 11 transistors, patented
ferrite antenna /tuner /volume dial- Works best outdoors. Uses
hearing aid batt. (inch -up to 100 hrs. playing. New batt.
to slip in avail. at drug stores (about 50f). No lengthy wires,
bulky cases, or power -packed!
Stock No. 42,275 EH
$14.95 Ppd.
PRO ELECTRONIC
SUPER POWER
FOR ANY AM RADIO
SOUND CATCHER
New antenna assist turns a tiny
transistor into a tiger, has pulled
in stations 1000 miles away! Just
set it beside your radio (no wires,
clips, grounding) and fine -tune
Select-A- Tenna's dial to same fre-
Parabolic mike w/ 183/4" reflecting
shield & 2 I.C.'s in amplifier magnifies signals 100X that of Omni- directional mikes. Catch a songbird 1/2
mile off; QB's huddle strategy; sounds
never before heard. Super directivity
gives highest signal to noise ratio poss. Safe: auto. cuts off
ear damaging noises. Earphones, tape recorder output, tripod
socket. Req. two 9v trans. batt. (not inch.
No. 1649 EH (51/z LB.)
RIG EAR "TOY" MODEL x.80,176 EH
AN ALPHA MONITOR
Yes, because you
ability to tune
FOR
-
quency
"Gangbusters "! Terrific
for sportsmen, vacationers. Great for clearing weak signals
in radio depressed areas, off -coast islands, stations in crowded frequencies. Solid state -uses no electricity, batts., tubes.
Works almost forever.
Stock No. 72,095 EH
$15.95 Ppd.
$299.00 Ppd.
$32.25 Ppd.
ELECTRONIC DIGITAL
$34.95?
STOPWATCH: $69.95
built it! Use your
price breakthrough! New pocket
size 4 oz. timer ecc. to - 2% of
last digit (1 /100 sec. increments).
Compares with others twice the
price! Instant error -free read-outs
to 9999.99 sec. (over 23/4 hr.).
Starts, stops, re- starts (accumulates). Mechanical pushbutton & electrical remote on /offs
w/ any 3.5 -150v AC /DC source. Plug -in jack. Incls. 9v batt.
Solid state.
A
your brainwaves,
an aid to relaxation, concentration.
Kit incls. everything you need (except 9v trans. batt.) to own a portable
self-cont. BIOFEEDBACK unit for a
pittance: steth. earphones, electrode
headband, solid -state circuitry; 5 microvolt sensitivity, more!
Compl. assembly instructions & op. manual. With basic
electronics knowledge, you can do it!
No. 61,069 EH (KIT)
$34.95 Ppd.
No. 71,809 EH (FULLY ASSEMBLED)
$55.00 Ppd.
in
MAIL COUPON FOR
180 PAGES
4500
No. 1943 EH (21/4x41/2x7/e ")
$69.95 Ppd.
DELUXE 2 EVENT STOPWATCH (± 0.01% OF LAST DIGIT)
No. 1653 EH (PRICE UP IN SEPT.!)
$120.00 Ppd.
COMPLETE AND MAIL WITH CHECK, M.O. OR CHARGE NO.
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New 2tIiag.)Heattlkit digital-design Color TV
Popular Electronics editors called the digital- design GR -2000 the
color TV of the future." Now you can enjoy the same technology and
features in the new GR -2050 with the convenient, popular 21 -inch picture tuba.
On- screen electronic digital channel numbers -big, bright, bold, and
easy to read, even from across the room. On- screen electronic digital
clock time -low cost insurance against missed programs. In 12 or 24
hour format, 4 or 6 digits. Silent, electronic, touch -tuning, thanks to
the combination VHF -UHF varactor tuner. No knobs to turn, nothing to
wear out. Just touch to tune...on the front panel or the Remote. Procomputer -like programmable digital counter /channel selector
gramming board for you to pre -program any 16 stations, UHF or VHF,
or both, in any order, even repeating if you wish. Touch the tune button and the counter silently sweeps up or down through all 16 channels, stopping when you release the button.
Exclusive fixed ten-section LC bandpass filter -does away with adjusted traps yet eliminates interference from adjacent channel, etc. And
it never needs instrument alignment.
100% solid- state -with more ICs than any other set and a black negative matrix picture tube for brighter, more vivid pictures.
Easy to build with modular circuits. Easy to service with built -in digital dot generator, check -out meter, and slide -out service drawer. Build
the GR -2050 TV of the future...Remote, $89.95. Cabinets from $119.95'
-a
New 21/2 -digit Heathkit DMM -only $79.95
Full function capability. Four overlapping AC & DC voltage & current rarigss plus
five resistance ranges with accuracy of 1% on DCV, 1.5% on ACV, 1.5Yó on AC
& DC current, and 2% on resistance. Ranges: (full scale) DCV, 2, 20, 20), 1000V;
ACV, 2, 20, 200, 700V rms (25 Hz to 10 kHz); DC current, 2, 20, 200, 200 mA;
AC current, 2, 20, 200, 2000 mA (25 Hz to 10 kHz); Ohms, 200, 2k, 20k, 200k,
2000k ohms. Lighted panel indicators show overrange, positive and necallive DC
voltages and current at a glance. All solid -state design uses IC circuitry for a
clear non -blinking display with up -date every 16 msec. One megohm n rut impedance with overload protection on all ranges; automatic decimal posit oning;
isolated floating ground; universal banana jack inputs; 120 or 240 V.Aÿ operation; one circuit board for easy assembly; blue & white heavy -duty metal case.
Kit IM -1212, $79.95; Assembled SM -1212, $125 *.
New Model Railroad Control Center/
Power Supply provides acceleration and
braking of unsurpassed realism plus
power for two HO or N -gauge engines
and accessories. Throttle slide control
plus 5- position Brake switch (Run, Re-
lease, Normal, Quick- Service, Emer-
gency), and Mode switch (Momentum or
Direct). Adjustable pulse width and frequency allow accurate control at low
speeds, eliminate "jack rabbit" starts.
Voltage control optimizes for each engine. One circuit board; builds in two
evenings. Kit RP -1065, $79.95*
New Digital Tachometer is faster than
any meter -type tach. Numbers whirl by
to show peak performance level your
engine reaches. Great for monitoring
best cruising RPM for your car, camper,
boat (inboard or outboard), planes, cycles, mowers, tractors, even stationary
engines. 2 -digit electronic readout shows
RPMs from 100 to 9900 in 100 RPM
steps. For 4, 6, or 8 cyl., 4 -cycle engines;
2, 3, or 4 cyl. 2 -cycle engines; 2, 3, or
4 -rotor Wankel engines; conventional,
C -D, or factory electronic ignitions (12 v.
neg. grnd. only). Black die -cast case with
bracket. Kit CI -1079, $49.95'.
New Breakerless Ignition Adapter develops timing signal electronically o your
car is timed correctly at all spee:s and
stays correct for longer periods I or use
with C -D ignition systems only, it places
the points of all pre -1975 GM V -ä s nd V -6
engines, and all AMC V -8s with external
dwell adjustment. Unit mourn s under
hood; sensor mounts in distribLtc r without removing points (switch relui ns engine to point timing when ycu wish).
Operates from -37.2°C to +85cC :. Easy
to build. Kit CP -1051, $44.95 *.
r
Send for
FREE
Catalog
-
HEATHKIT ELECTRONIC CENTERS
Units of Schlumberger Products Corporation
Retail prices slightly higher.
HEATH
Schlumberger
ARIZ.: Phoenix; CALIF.: Anaheim, E Cerrito, Los Angeles, Pomona, Redwood
City, San Diego (La Mesa), Woodland Hills; COLO.: Denver; CONN.: Hartford
(Avon); FLA.: Miami (Hialeah), Tampa; GA.: Atlanta; ILL.: Chicago, Downers
Grove; IND.: Indianapolis; KANSAS: Kansas City (Mission); KY.: Louisville; LA.:
New Orleans (Kenner); MD.: Baltimore, Rockville; MASS.: Boston (Wellesley);
MICH.: Detroit; MINN.: Minneapolis (Hopkins); MO.: St. Louis (Bridgeton); NEB.:
Omaha; N.J.: Fair Lawn; N.Y.: Buffalo (Amherst), New York City, Jericho (L.I.),
Rochester, White Plains; OHIO: Cincinnati (Woodlawn), Cleveland, Columbus,
Toledo; PA.: Philadelphia, Pittsburgh; R.I.: Providence (Warwick); TEXAS: Dallas,
Houston; VA.: Norfolk (Va. Beach); WASH.: Seattle; WIS.: Milwaukee.
Heath Company,
Dept. 20 -07
Benton Harbor, MI 49022
Please send my free 1975 Heathkit Catalog.
ADDRESS
iY
ST
.PRICES ARE FACTORY MAIL ADER, FOB
A SPECIFICATIONS SUBJECT ,o CHANGE wITHOUT NOTICE.
( rade 100 un reader service card
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,J
ìL-568
Proved in the lab!
...
approved in the field!
The NEW MEZZERTM
TELEVISION FIELD STRENGTH METERS
Invaluable for
The instruments use two 9v
for 120vac operation.
VHF
Range:
Meter:
Antenna installation
Antenna evaluation
M A1 V
CAT V
Output calibration of TV signal generators and similar signal sources
alkaline transistor batteries for field use, plus inbuilt power supply with wall lalug -in transformer
Model FSM - V
net $119.95
microvolts to 100 millivolts
Scale calibrated in microvolts (linear) and dB (log.). Ref: 0dB
1 millivolt.
Full scale basic range 1 millivolt
20
=
Attenuator: X 1 (+ 0dB); X 10 (+ 20dB); X 100 (+ 40dB)
Tuning:
All 12 VHF channels
Inputs:
75 ohms - "F" connector; 300 ohms - screw terminals
Accuracy: I 3dB typ.
UHF
Model FSM -U
net $99.95
Range:
20 microvolts to 10 millivolts
Meter:
Scale calibrated in microvolts (linear) and dB (log.)
Attenuator: X 1 (+ 0dB) and X 10 (+ 20dB)
Tuning:
Full UHF band. Ch. 14 - 83
Inputs:
75 ohms - "F" connector; 300 ohms - screw terminals
Accuracy: ± 3dB typ.
These instruments boast the extra features of all Castle products- advanced technology- modern styling -and they work
Ask your electronic distributor for them
... or write for more cietails.
CASTLE TV TUNER SERVICE, INC.
5715 N. Western Ave., Chicago, Ill. 60645
Ph. 312- 561 -6354
In Canada: Len Finkler Ltd., Ontario
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