POPULAR Ac

100 Pages·2014·6.98 MB·English

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TAPE ,CÁSSETTES--FACTS & FANCIES
POPULA
JUNE
1969:
BUILD OUTSIDE LIGHT -GREETER
HOW TO TESTA _UNIJUNCTION
CARL KOHLER GOES.. LOOT HAPPY
"EYEBALLer"MONITORS CB RIG
BUILD i
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WIRE !. SS
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190,76 d77- 000M0311
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113NNadI 1
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make learning
Electronics at home
fast and fascinating
give you priceless
confidence.
firsts
Some NRI in training equipment
n.
f11 Sly to give you Color Television trainin-g iai ies to give you transmission lines and
equipment engineered specifically for education antenna systems that include experiments not
built to fit NRI instructional material, not a do-it- otherwise attempted outside of college physics
yourself hobby kit. The end product is a superb laboratories. The- e xperience gained- w ith this kind
Color TV receiver that will give you and your family of Communications training equipment is matched
years of pleasure. You 'open up and explore" the only by months sometimes years of on-the-job
functions of each color circuit as you build. experience.
NRl's "discovery" method is the result of over
half a century of leadership simplifying
and dramatizing training at home
The FIRSTS described below are typical of NRI's half century of leadership in Electronics home
training. When you enroll as an NRI student, you can be sure of gaining the in -demand technical
knowledge and the priceless confidence of "hands-on" experience sought by employers in
Communications, Television -Radio Servicing and Industrial and Military Electronics. Everything about
...
NRI training is designed for your education from the much -copied, educator -acclaimed
Achievement Kit sent the day you enroll, to "bite -size" well -illustrated, easy to read texts programmed
with designed -for -learning training equipment.
YOU GET YOUR FCC LICENSE OR YOUR MONEY BACK
There is no end of opportunity for the trained man in Electronics. You can earn $6 or more an hour in
spare time, have a business of your own or qualify quickly for career positions in business, industry,
government. And if you enroll for any of five NRI courses in Communications, NRI prepares you
for your FCC License exams. You must pass or NRI refunds your tuition in full. No school offers a
more liberal money -back agreement. The full story about NRI leadership in Electronics training is in
the new NRI Catalog. Mail postage -free card today. No salesman is going to call.
NATIONAL RADIO INSTITUTE, Washington, D.C. 20016
APPROVED UNDER NEW GI BILL If you have served since January 31, 1955,
or are in service, check GI line on postage -free card.
designed from chassis up for your education
0 'UM
n
e
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f
s
..-&AI
r_
- .
first
firstto give you true-to-life experiences as a to give you completely specialized
communications technician. Every fascinating step training kits engineered for business, industrial and
you take in NRI Communications training, including military Electronics. Shown above is your own train-
circuit analysis of your own 25 -watt, phone/cw ing center in solid state mctór control and analog
transmitter, is engineered to help you prove theory computer servo -mechanisms. Telemetering circuits,
and later apply it on the sob. Studio equipment solid-state multi -vibrators, and problem -solving
operation and troubleshooting become a matter of digital computer circuits are also included in your
easily remembered logic. course.
POPULAR VOLUME 30 NUMBER 6 JUNE, 1969
WORLD'S
LARGEST-SELLING
ELECTRONICS ELECTRONICS
MAGAZINE
SPECIAL CONSTRUCTION PROJECT
BUILD WWRC 27 John S. Simonton, Jr.
Signal Control on Commercial Wiring
FEATURE ARTICLES
BUILD THE UJT TESTER 33 J. W. Cuccia
Check Unijunction Transistors
ELECTRONICS MATHEMATICS QUIZ 40 Robert P. Bolin
BUILD THE EYEBALLER 41 Jim White, WSLET
Monitor 3 signals at once
LIVE WIRE WITH A LOOT LOCATOR 45 Carl Kohler
Diamonds on the beach
IONS ON VACATION 50 Nick Roberts
YOUR OWN PRIVATE OWL 51 James A. Archer
Turn on your outside lights
NO MORE FUSES 59 Neil Johnson
Use a variable circuit breaker
FINDING PARALLEL RESISTANCES 61 Ronald L. Ives
PRINTED CIRCUITS, PATH OF LEAST RESISTANCE 63 Roy Hartkopf
Tips on making your own
THE STEREO SCENE 65 Charles Jackson
Cassettes: not either/or, but and!
CALCULATING INPUT AND OUTPUT IMPEDANCES 69
SECOND-GUESSING THE "PITCH REFERENCE" 70 Emerson M. Hoyt
THE PRODUCT GALLERY 76
Stereo FM Compact (Heathkit Model AD27)
SOLID STATE 78 Lou Garner
SHORT-WAVE LISTENING 81 Hank Bennett, W2PNA
U.S. Pirate Station Located
ENGLISH -LANGUAGE BROADCASTS TO NORTH AMERICA 84 Roger Legge
AMATEUR RADIO 85 Herb S. Brier, W9EGQ
Amateur radio program begins 10th TV season
DEPARTMENTS
LETTERS FROM OUR READERS 8
OUT OF TUNE 11
Build "OpTach" (March 1969)
"Sound With -Sound Mixer" (March 1969)
"Popular Electronics Universal Frequency Counter,
Part 2" (April 1969)
NEW LITERATURE 14
READER SERVICE PAGES 15, 95
ELECTRONICS LIBRARY 16
NEW PRODUCTS 22
87
OPERATION ASSIST
CB JAMBOREE CALENDAR 94
TIPS AND TECHNIQUES 97
INDEX TO VOLUME 30 (JAN. -JUNE, 1969) 98
PinO PthUeL ARRe aEdLeErsC' TGRuOiNdeIC S IS indexed This month's Ccoonverard p hSotutod iboys
to Periodical Literature copyright gl 1969 by ZIFF-DAVIS PUBLISHING COMPANY. All rights reserved.
PIpO8lloO0itnst3aPto0awUgi2sae.L , A6pERta0'dai 6duit0 aoE1udrL.tie aE OlC Ca,h,oTneifcd fRia cYOegefsooNa .rr I fCoIlsprlSiu anb,myo smiacJsenru inunpatset nic odorni fp1 at9 trp 0aoc9atseo,dt nadgtfVioretiairb o launUintnaic o.leS n r.ms,a3 ,s a0Uh.ir..l eiSna...g dNv eauPrhtmí o ssbilcneeereeqri pysu.St iiiirnimi.,Ie ,lue sl P,is, aaaebenrrvdift_icis c.ehe:C de ad Ona anansemdd a os,P nPeateo$horr5lkiuyn. d1 g 1A a0crtle:. a 3.s5,3a s7 0lN9l7 :em owat h.PiNle oVorrar btttlhyicac on, tudMhVn eit.c rYPihePl.ias goc,sa e1tn ,$0 60O.11:Bfaf16oivc0.uee . ln dueSeDre,,i c poCCanhrdok ilcioncar lragaodostos,.
4 POPULAR ELECTRONICS
What could
a
career in electronics
to you?
mean
14.4
r I
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rL.Tr
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Escape from a Freedom f om Greatly increased
dead-end future automation fears earnings
A key spot A better standard A chance to be
in a key industry of living your own boss
r
A great field, electronics. With an even
greater future. And-if you have the skills D414E1 VWERSYT B EIfL1MSOTNTIT AUVTENEU EO. FCH ITCAEGCO.H ILfLOINOLISO G606Y41 PE -6A
-a
good spot for you. At good money. In ONE OF THE
BELLEHOWELLSCHOOLS
the growing electronics industry. Or in
business for yourself. Please send me your two free booklets and information
about preparing for careers in Electronics. I am in-
DeVry Tech grads have the skills. You terested in the following opportunity fields (check one
or more):
can too. Send in the coupon and let us o Space & Radar Broadcasting
show you what a career in electronics TMEelielsecsvtirlieso inoincs AEuletocmtroantiiocns IEnldeucstrtorinailc s
could mean to you. and Radio Communications ¡J Electronic
Microwaves Computers Control
Name Age
DE VRY If1STITUTE OF TECHROLOGY Address Apt
4141 WEST BELMONT AVENUE. CHICAGO. ILLINOIS 60641 City
ONE OF THE State Zip Code
BELLE HOWELL SCHOOLS Veterans: Check here. If you were discharged after
Jan. 31, 1955, the "G.I. Bill" may cover the entire cost
of your tuition.
June, 1969 5
BREAKTHROUGH
POPULAR ELECTRONICS
PHILLIF T. HEFFERNAN
Yá;=1 Publisher
OLIVER P. FERRELL
Editor
LESLIE SOLOMON
IN ELECTRONICS CALCUTATING. Tech nirot Editor
JOHN R. RIGGS
Ssthlotisiwl l npepewlno cdEild l-ieancngtd r o-tpnhaircposeu rg Shwli daeym? a RSthum leaa.s nhd theel ecptaropenricwso rkp rboabrlerimers wtihthe EDWARMDaAa rotu iIDn. gir eEBctdoUirt oXr BAUM
thrEouvegnh ifr eysooun'avnet nferevqeur eunsceyd caa lscliudlea tirounles baenfdo rien,d uyocuti veca no rw chaiz- ALEXANDAsEsoRcia teW E.d itoBr URAWA
pacitive reactance problems. You can find reciprocals for ANDRE DUZANT
resistance formulas instantly. You can even locate tricky Technical Illustrator
decimal points in a jiffy. PA7TI MORGAN
You can also work regular math problems in a flash: multi- Assistant Editor
plication...division...square roots...logarithms...trigonometry. AURORA NARDOZZI
Anyone can use this sturdy 12 -inch, all -metal slide rule. Editorial .Assistant
Wccaoesu erss ehdo.e wliS bleiydoreau t erhluyol ew,p riwccoeitudhr seolo,u wr anacdso mhopaulnre dtews oamy4 e-lo efs lesmoaanthk einirng s ctrfaurricerytniiondngs HH.. BS.E NBNREIETRT,, WW29PENGAQ
with men in Electronics FREE booklet gives full details. Mail L. E. GARNER, JR.
coupon below today. M. P. SPINELLO, KHC2O6O
Contributing Editor..
MAIL THIS. COUPON FOR FREE BCCEILET. RICHARD J HALPERN
Advertising Manager
CIEClevelandInstitute of Electronics ARDYS C. MORAN
1776 East 17th Street. Creveland.Ohio 44114 Advertising Serrice Manager
Please send me your FREE booklet describing the Elec- LAWRENCE SPORN
tronics Slide Rule and 4 -lesson instruction course. Also Associate Publisher
FDRatEaE G iuf idI ea. ct at once-a handy pocket -sized Electronics ZIFF-DAVIS PUBLISHING COMPANY
Editorial and Executive Offices
Nnmc One Park Avenue, New York, New York 10016
Address le,usr PRINT) 212 679-7200
City j 307 North MichigaMni dAwveesnteuren, OCfhfiiccea go, Illinois 60601
L State Zip PE -157 Midwestern Advertis3i1n2g 7M2a6n.0a8g9e2r, JAMES WEAKLEY
CIRCLE NO. 7 ON READER SERVICE PAGE
Western Office
9025 Wilshire Boulevard, Beverly Hills, California 90211
5Argos' new speaker technology 2W1e3s teCrnR esAtvdievwer ti4si-n0g2 6M5;a nBaRgaedr,s hBaUwD 2D-1E1A61N
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Ishikawa Mansion, #4, Sakuragooka
price breakthrough in Shibuya-ku, Tokyo, 462-2911.3
two-way system design. Circulation Office
Portland Place, Boulder, Colorado 80302
é ,
William Ziff, President
W. B,odford Briggs, Executive Vice President
Hershel B. Sarbin, Senior Vice President
Philip Sine, Financial Vice President
Walter S. Mills, Jr , Vice President, Circulation
Stanley R. Greenfield, Vice President, Marketing
Phillip T. Heffernan, Vice President, Electronics Division
Frank Pomerantz, Vice President, Creative Services
Arthur W. Butzaw, Vice President, Production
Edward D. Muhlfeld, Vice President, Aviation Division
Irwin Robinson, Vice President, Travel Division
Furman Hebb, Administrative Vice President
George Morrissey, Vice President
Sydney H. Rogers, Vice President
o w TZRlarakloa,eiuvlr.nttDeienrla o.g nv.W iiSseekBs e UiinkNalW)gly sNo .or eA slsdr e.pa u3 b NlFiCslehyoweimsns,gm .e SrAkcMiiiaiornlldi gne reATn v riaaMdtIie:aor nniadN.e ge.e wCmsaPe.r o npStau tnledara ren oDd Ir'iRhvueeMetvrroa.i.e erkwrCep, turi nhagiync..d..
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aTloXnwc -2e -r0 e0sa onmnda antccchoeem swp oaaoc ftsenpre eswcsiit ahl lfyao -rnd eemws aighxniigmehdu - cmoh migvhpe rrescsaostmiiloitpnyl .ia hnoTcrhnee ,- aEggrfeaI TphOasn idt1 oArw o1m il.l a rCrnsbOuneso NcnrhTsipaRlhtnsildnl.u lel 'lTdy I OwfoNitrhS r emretuuarssnto nhoaerb leas caccfoeamlryep ta onfhie odaw retb vye wrr.eo trukPr.u nb plihPsohotesotr-.
lroeasdpeodn sed rfrivoemr 30c oHmzp toon tehnet intaou dpibrloedsu acte 18d,0is0t0o rHtioz.n -tree .OAV/S -ity AtEDe MPA
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Price:C AIRudCioLpEh ileN One.t 3$ 4O5.N00 . READER SEGRenVoaIC, EIll inPoAisG 6E01 35 POPULAR ELECTRONICS
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CIRCLE NO. 23 ON READER SERVICE PAGE
June, 1969 7
introducing
. . .
etters
S-DeC breadboard:
FROM OUR READERS
HAM SPEAKS OUT
While reading through "The Hatfield Hams
and the CB McCoys" (February, 1969), I found
some very debatable points. I'll start by
for easier stating that I have had my ham ticket since
January, 1958, and worked the old 11 -meter
circuit building ham hand before it was turned over to the
CB'ers. I don't miss the band now, and I
An S-DeC contains 70 push -in contact don't regret that the FCC took it away. Nor
points which are arranged in two sets of am I against CB radio the way it was origi-
five numbered rows with each -five póints nally set up. However, I have only contempt
jtohiinse pda ttteorgne thise sr imbiyla ra tole tahfa -st purisnegd binu'psboapr-; fCoBr 'etrhse wmhao joirnitsyis-ta nodn Ir agm eacnh ewminagjo, rsitiygn-oalf
ular wiring boards. Larger circuits can be reporting, and operating with illegal linear
made by keying units together to form a .. amplifiers. These CB operators have really
continuous breadboard of any size. fooled themselves into believing they are
hams.
Csoocmkeptosn ewnhtse rea rteh eys imaprley ' hpeuldsh esde ciunrfeol y thbey anT oe mceirtge enacny eaxraomsep lein, aobuoru tc ittyw oo f y1e0a,r0s0 0 aigno-
double -leaf .phosphor -bronze contacts. habitants, and the CB operators were on
This system ensures a good wiping -action hand to assist; well and good. But a spokes-
on insertion and withdrawal, giving low man for the CB group told the local news-
contact resistance. The accessory kit pro- paper they were ham operators; not so good
vides' solderless connectors to use with -in fact, a black eye for the hams. Imagine
controls. which are mounted on a panel CB'ers passing themselves off as hams!
slotting into the S-DeC base. The POPULAR ELECTRONICS article implies
S-DeCwith control' panel, jig, 'accessories that rag -chewing CB'ers used to exist. The
and project leaflet. $5.75 each
DeC STOR=Two decks,: control panel, jig;
áccessories, project. leaflet with corn-
pónents tray all in .black plastic box.
$11.75 each
4-DeC Kit=Four decks,- .two 'control
panels, jigs, accessories, and - project
book in áttractive plastic -case. -
$20.75 each
INTRATEC
399 Jefferson Davis Highway
Arlington, Virginia 22202
Please send me postage paid:
S-DeC's @ $5.75 each
DeC STOR @ $11.75 each
4-DeC's @ $20.75 each
I encloVsae. ar escihdeecnkts/m oanded y 4o%rd esr alfeosr $ta x fisa ctth ei s,o nhlyo wkeinvder ,o ft hCaBt 'etrh iosn tythpee aoifr -oapnedr atthoer
Money refunded if not satisfied. clan is growing. Furthermore, I can show
you antennas all over the countryside where
Name the CB'ers don't even pretend to comply
Address with height regulations. Some CB operators
here even use linear amplifiers with more
City than 100 watts plate power input. (A sup-
State Zip Code posedly reputable TV sales and service shop
Box PE -6 here sells linear amplifiers to go with their
I.
CIRCLE NO. 14 ON READER SERVICE PAGE
POPULAR ELECTRONICS
TaIkábüúté-IeótróAic'
iermarket
j 11.(421
¡
ú+ ~Tx -{
A
I
OVER
t -
.,.,. . . -. 80. 0.
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h !tr9'?POPULAR,
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It loi every
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TEST EOUIPAENT-TOOLS
- EEPERIMEN-ERS A LAB SUPPLIES
1. `* .-.111. '1 coCAnoutnrtovOoel mnnu -iaOentnifitfct SfroTewrimm itacoenhtrye EMSRLIPEKEESECAISSTK TREO-ORRNBSS IC B i MAA CUCDOC INEO&ST RSTAAOOCPRLCESIEE SASSC OCRESIESSCO ARPIEASC ITORS
applsiaentsc ef,o rt imaneyr icnotenrtvraoll 1 METERS -ROILS -RELAYS-TRANSFORMERS
up to 60 minutes. SWITCHES -LAMPS .WIRE -CABLES
whiBtee acuatisfeu,l geryetreanl oanngd ANTENN-A HARDW-A RE
12 foot cord. PLUGS IAyKS BATTERY HOLDERS
Installepdl uigns sienctoo nadnsy -
D-.rtaH Ask Nwfooar. ICN Oa4ut.a0tlle0ot5g. - NhuorwO raet desa cohf ilto=cmast iofonr, ' heuvnedryreodnse a..n d
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honeowner, executive, do-it-yourselfer.
See the SELFSERVICE GC CALECTRO
display at you CALECTRO ELECTRONIC
SU'ERMARKET TODAY! _ z
Telephone Amplifier Dynamic Microphone
for Group Listening with switch
caPllesr feactt thfeo r ofaffmiceil,y ocra ll"sh aatn dhsomfree.e "c oonpfeerreanticoen Fwoofofrr esshw igiathcn hdf. i dmFeuloistlyidc i.n rgeB cudoierltds-iiknn g t oon0p1. 700 Locations
when taking orcers or instructions by phone. stand. Dual plug for most tape I
Suction cu3 pickup attaches to outside recorder inputs. all over the country
of phcolenaer, . bBrinugilts- inin vcoolnumveer scaotinontrso l loguodv earnnsd A$s3k9 5f or Catalog No. 04.186 and Canada
Ask lofourd nCeastsa.l ogB aNtote. ryN i4n$. 19k09it53. rIGmrepmeadeannCccye : R2e0s 0p oonhsme:. Rsoe -nsoscdoiw clyp:s -5600 Sanede ySoAuVrE e! lecLtroOnicO pKarts distributor
In the Yellow Pages under "Electronics"
ELECTRONICS and call your Calectro source.
This G -C CALECTRO HOBBYIST
HANDBOOK" is available at GC
CALECTRO ELECTRONIC SueER.
MARKETS. WRITE TODAY and we'll CALECTRO wirGC
give you the name of your nearest
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CIRCLE NO. 12 ON READER SERVICE PAGE
June, 1969 9
LETTERS (Continued from page 8)
Which of these CB rigs, and not under-the-counter, either.
They're right there on the shelf, complete
with price tag.)
4 fascinating I played dumb about radio with the sales-
man in the TV shop. I asked him a few ques-
tions about CB and just let him talk, but
Radio -TV
until he thought I was really interested in
buying a linear, he referred to his linears
careers as battery chargers! Then I asked for the
names of some satisfied CB'ers, and he
obliged. Why, I could have been an FCC in-
spector for all he knew.
interests One more point: some manufacturers make
fF
linears to cover the 25-50 MHz "business"
? band, but state in their advertising that the
linears are "not for CB use." They might as
well state "for 27 -MHz band, not for CB use"
disc jockey if they were really looking to drum up busi-
newscaster r ness. The obvious reason for mentioning CB
at all in the advertising is that CB'ers are
sportscaster prime sales targets.
announcer The FCC has recently tightened up on
hams with incentive licensing. Now I feel
it is time to tighten up on CB operations by
encouraging the FCC to acquire more mobile
Our Free Voice Analysis Tells You monitoring trucks to visit these small towns.
Whether You Have The Talent To Also, handing out more citations to rule
Become A Broadcast Personalty! breakers would help clear up the mess and
give the good name back to ham radio and
IMMEDIATE DEMAND Radio -TV stations CB as well.
everywhere need both men and women to
take over important good -paying jobs JEFF LUTIIER, K4TRY
right now. NATIONWIDE PLACEMENT AS- Union City, Tenn.
SISTANCE at No Extra Cost.
TRAIN AT HOME OR IN ONE OF OUR
STUDIO SCHOOLS You can study broad-
ctiamset , toerc hinn iqonuee so f aotu rh ommaen, y isnt udyoiou rs cshpoaorles NYSTAGMIC vs SACCADIC EYE MOVEMENTS
throughout the country under the super- The part of "The Dizzy Machine" article
vrNnisaoituoiosnn aoBlf rHooaoudmrc eaD sSitreteurcsdt.yi n gCA ocuFcnraeccdiul ilttaeynd d o NfM a1et1mi obnFeaarl- d(Aizpzrinile s1s9 69is) tahcactu rdaetea,l s bwuitt h thney straegstm uosf atnhde
Association of Trade and Technical Schools. article leaves much to be desired. Electro-
nystagmography is only one phase of a gen-
'.,1A pproved``. for` Veterans', Educational eral technique called electro-oculography
; ,Assistártce Benefits-("G.l. (EOG), the study of eye movements by means
4 Check- cotipon,for special. inforn ató n' of changes in electrical potentials produced
in the surrounding skin. Some of these
Send to CAREER ACADEMY's division movements, which have a sawtooth pattern
of famous broadcasters for free book- and are of low amplitude and relatively high
frequency, are nystagmic. However, they are
let, record and voice analysis details!
not associated with dreaming; the move-
ments associated with dreaming produce
much higher amplitude, fairly short rise
CAREER ACADEMY time, lower frequency patterns. These are
saccadic or rapid eye movements.
825 North Jefferson Street Studio 384 The movements studied in reading are
Milwaukee, Wisconsin 53202 of still another kind, more closely related
wI owrtahn t detove loknpoinwg . if PI leahsaeve rubsrho amdcoares tiningf oramp aittiuodne. tIon fsaacctc, atdhiec utshea no f toth en yEsNtaGg moric evmeonv EemOeGn tisn.
speech pathology is neither widely used nor
name age accepted.
Finally, while some psychologists make
wide use of EOG (including ENG) in a variety
address phone of ways, few of us are concerned with ESP.
In any case, it is not nystagmus but lesser
city/state /zip frequency REM which is probably used as an
O,N097205 index in dreaming in ESP studies.
I. I amS chinotoelr eSsttueddy in: HGo. mI.e BSillt udy ChiefA NRUe7süe; aMrc.h WCElIiTnZicEaNlI IPOsFyFEcRh,o lPohg.iDst.
Veteran's Administration Hospital
Oklahoma City, Okla.
CIRCLE NO. 6 ON READER SERVICE PAGE
10 POPULAR ELECTRONICS