divide by anything heath programmer

108 Pages·2013·11.98 MB·English

IC FUNCTION GENERATOR EXPERIMENTS -BUILD A 2650 COMPUT R
THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS
programmable
it's
DIVIDE BY ANYTHING
frequency divider
automatic color TV
HEATH PROGRAMMER
changes channels for you
get your ears on
CB PREAMPLIFIER
boosts sensitivity
new radio rules
'79
WARC
can affect you
Test Reports
mplifier
oW
reamp
Jac arr's Service Clinic
Komputer Korner
Equipment Reports
6ERNiB IIIJK
°U3UCATCN
Step -By -Step Troubleshooting
www.americanradiohistory.com
www.americanradiohistory.com
Computer
Pinball problem is displayed on your scoreboard in
digits. Check the instruction booklet and sim-
ply remove the designated plug -in circuit
board, light bulb or part and send it to the
service department closest to you for a brand
Your home, apartment or office can become an new replacement. Even your TV or stereo
isn't that easy to repair.
action entertainment center with America's Please don't think service requirements are
common. They're not. But we wanted to as-
first commercial -home pinball machine. sure you that service was such an important
consideration in its design that Fireball prac-
It's you against a computer. And the action Although the playfield is just as large as the tically repairs itself. And any defective corn -
and excitement from Fireball, your own com- commercial machines, the entire unit has less ponent will be replaced free -of- charge during
puterized pinball machine, is nothing short of weight, less bulk, and practically no service re- its one year limited warranty.
spectacular. quirements making it ideal for the home or
Fireball's computer replaces many of the office. It takes up a space 2 feet by 4 feet and SHIPPING AND THE TRIAL PERIOD
mechanical, scoring, conventional electronics weighs 160 pounds. Each Fireball comes in two sections with
and sensing devices of a standard pinball HOW TO JUSTIFY PINBALL four metal legs. The two sections quickly bolt
machine. It's a dramatic change in pinball de- (TAKE THIS TEST) together with the top portion also plugging
vices and the start of a new consumer elec- If you paid more than $600 for either into the bottom to make all electrical connec-
tronics revolution. your TV set, stereo system or pool table -you tions. Within minutes after it arrives, your
DESIGNED FOR ACTION should consider a pinball machine. You'll unit is ready to operate.
Fireball contains flippers, bumpers, thum- have more fun and action than watching TV, Attach the metal legs, plug it in and start
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the start button up to four times. Each play- ment to big parties. It's the great new idea in are getting with Fireball.
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The ball is automatically ejected and you an executive toy or a free new benefit for turn costs. And you can play Fireball for one
pull the plunger to project it into action. The your office or factory employees during their month before you make up your mind.
ball bounces from side to side from bumper breaks. You get both an investment tax credit
to thumper. Lights flash and the scoring be- and depreciation. Fireball combines participa- A GUARANTEE OF SATISFACTION
gins. You use the separately controlled flip- tion, action and entertainment. A pinball The cost for your own pinball machine is
pers by pressing the flipper controls on the machine is so intriguing that people pour $795 (Illinois residents add $39.75 sales tax)
sides of the playfield which are low enough so dollars into them at arcades. It requires skill, plus the freight which you pay upon receipt
that even a five year old can reach them. sharpens responses and can become the single and which will run approximately $34 from
Flip a switch and Fireball can be pro- most talked about entertainment product in our facilities in Northbrook to Los Angeles or
grammed for beginner or advanced skills al- your home or office. less if you live closer. You can order Fireball
though pinball is the only game everybody LASTING PLAY VALUE with any major credit card by calling our toll -
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ious scores sound five additional tones making matter how long you've played. Ask any ar- reason you get tired of playing it, or 3) you
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COMMERCIAL PARTS AND FEATURES played and played and played. efaxspte nsseer viacned truerfnuanrdo uynodu r timmoen esyh. oWuled psreorvviidcee
Fireball contains the same heavy -duty de- ever be required and we have been in business
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Fireball and a tilt sign glows and the scoring price. Fireball is not a toy and is built by a to America's largest single source of quality
stops. The full- sized, full -color commercial company that specializes in pinball machines. space -age products.
playfield even has a special friction silk- screen- With all its sophistication it is the most service - Why not let 'the fun and action of your
ed surface so the ball will roll and not slide. free, quality pinball machine ever produced. very own pinball machine add to your home
Fireball differs from an arcade unit only by or office entertainment picture? We'll make
the start button which has replaced the coin When you buy an expensive product you just trying Fireball the best entertainment
slot and its new electronics. In fact, all future must be absolutely satisfied that you get the move you've ever made. Order one at no obli-
commercial machines will resemble Fireball service and a solid company standing behind gation today.
within a year. your purchase for many years to come. Fire--
MANY NEW FEATURES ball is backed bya substantial company, Bally
Fireball's computer is as powerful as the in business since 1931 and now the world's
million dollar IBM computer sold in 1964. largest manufacturer of coin operated amuse-
The solid -state LED scoreboard replaces the ment games. JS &A is America's largest single
old electromechanical pinball scoring wheels source of space -age consumer products and
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track of everybody's score but the exact play- - A FRANK DISCUSSION OF SERVICE SALES
field configuration and extra bonus balls Fireball is a solid -state computer with it-s GROUP
something present arcade games can't do. electronics condensed on integrated circuits
all hermetically sealed and all pre -tested for a Dept. RA One JS& A Plaza
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home and office entertainment centers. the back panel of your machine and the exact ©JS &A Group, Inc.,1977
www.americanradiohistory.com
There's more to Realistic
40- channel than just
CB
17 added channels,..
o
SQUELCH
there's
years of know -how!
17
With so many new and unproven brands on the CB Three ceramic IF filters improve the selectivity for a
bandwagon, the reasons for buying Realistic are clearer whopping 80 dB of adjacent- channel rejection. An automa-
than ever. Seventeen years' experience and sales of a million tic noise limiter cuts pulse Gnterference, and it's switchable
sets annually have shown us what it takes to be a leader: for maximum clarity on stronger signals.
-
Intelligent, reliable engineering. Easy -to- find sales and Illuminated signal strength /RF output meter and chan-
service to the tune of 4800 Radio Shacks in the USA nel selector, LED modulation indicator- conveniences that
alone. And low prices that are possible only because Radio make your CB easier and more fun to use. With dynamic
Shack is a do- it- yourself company, from factory to ware- plug -in microphone, adjustable mobile bracket, and power
house to sales counter. cables for any vehicle with 12 VDC positive or negative
Take a look at our new high- performance mobile ground.
-
transceiver, the TRC -467. Advanced phase -lock loop Come in today and see the TRC -467. Designed, man-
circuitry generates all 40 channels with an electronic ufactured and sold only by "the" CB experts Radio
precision far beyond the limits of the multi -crystal sets. Shack. Just 119.95 *.
SOLD ONLY WHERE YIOU ShEE THIS SaIGN: elt
ftadue
These two credr cads
honored at most Radio Shacks.
*Prices may vary at iraividual A TANDY COMPANY FORT WORTH, TIEX.§S 75107
stores and dealers. OVER 5000 LOCATIONS IN NINE COUNTRIES
www.americanradiohistory.com
-Electronics
Radio
THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS
Electronics publishers since 1908 MAY 1977 Vol. 48 No. 5
BUILD ONE 37 Divide By Anything (Cover Story)
OF THESE It's a programmable frequency divider. ON THE COVER
by George Baumgras
Programmable divider pro-
45 Build A 2650 Microcomputer vides a wide range of frequen-
Part II: Troubleshooting and assembly.
by Jeff Roloff cy division by using three
cascaded 555 -timer IC stages.
60 Make This Speaker Phone Yourself
Easy project offers hands -off phone use. The divisor is selected by three
by Jules Gilder 10 -turn potentiometers and in-
66 Experiments With IC Function Generators dicated by an LED readout.
Part III: More circuits using the XR -2206. Complete story starts on page
by R.M. Marston
37 of this issue.
70 Boost Performance With This CB Preamp
Simple solid -state unit plugs between your
CB antenna and rig. Enhances receiver performance.
by George Sante
GENERAL 4 Looking Ahead
ELECTRONICS Tomorrow's news today. by David Lachenbruch
24 Komputer Korner
Microcomputer interfacing and internal registers within
the 8080 chip.
by David Larsen, Jon Titus, and Peter Rony
30 VIZ Pulse Generator (Equipment Report)
We test the new VIZ WR -549A
77 New Radio Rules
Special report tells how WARC '79 can affect you.
by Stanly Leinwoll
HI -FI 42 New Way To Room Equalization
STEREO Shure equalization analyzer speeds setup of graphic
equalizers for overall flat response.
by Len Feldman THIS KEYBOARD CONTROLS channel selec-
56 R -E Lab Tests Nikko Integrated Amplifier. tcioanlly asnwdi tcphr ocghraanmnse las nfoerw y oTuV. Ist'est atno aimuptoomrtaanti-t
Nikko TRM -750 rated "excellent" in overall sound quality. part of Heath's programmer system. For full
58 R -E Lab Tests Heath Preamp details turn to page 49.
Heath AP -1615 earns a "very good" in our lab.
TELEVISION 49 Heath Programmable Color TV
Automatic circuitry changes channels for you. Digital program
readout on the screen. Discover how it works. Radio-Electronics, Published monthly by Gernsback
by Art Kleiman Publications, Inc., 200 Park Avenue South, New York,
NY 10003. Phone: [phone]. Second -class postage
81 Jack Darr's Service Clinic paid at New York, NY and additional mailing offices.
How does your service shop rate? by Jack Darr Oannde -yCeaanra dsau, bs$c8r.i7p5t.io nP arna-t Ae:m eUr.iSca.An. , cUo.uSn. tripeoss, se$s1s0i.o2n5s.
Other countries, $10.75. Single copies $1.00. 1977 by
87 Reader Questions Gernsback Publications, Inc. All rights reserved. Printed
Radio -Electronics Service Editor helps solve reader problems. in U.S.A.
Subscription Service: Mail all subscription orders
changes, correspondence and Postmaster Notices of
undelivered copies (Form 3579) to Radio- Electronics
Subscription Service, Box 2520, Boulder, CO 80302.
DEPARTMENTS 98 Advertising index 7 New & Timely A stamped self- addressed envelope must accompany all
12 Advertising Offices 88 New Products sthuebirm itrteetdu rnm ainsu sdcerispirtse da nsdh /oourl da rttwhoeryk boer prheojetocgterda.p hWs eif
14 Letters 92 New Literature dmisacnluasimcr ipantsy arneds /poor nasribtwiliotyrk foorr pthhoet olgorsasp hosr wdahmilea gine ouorf
96 Market Center 99 Free Information Card possession or otherwise.
ABse caa usseerv oicf ep toos sreibalede vrsa,r iaRnacdeiso -IEnl ethcetr oqnuicasli typ uabnldis hceosn daitvioainla obfl em paltaenrisa losr aInnfdo rwmoarktiomna nrsehlaiptin ugs etod nbeyw rsewadoertrhsy, Rparoddiou-c Etsle, cttercohnniciqsu deiss calanidm ss caienyn tirfeics paonnds itbeiclihtyn ofolor gthicea ls adleev eanlodp mpreonptesr.
functioning of reader -built projects based upon or from plans or Information published in this magazine.
3
www.americanradiohistory.com
looking ahead
Microwaves and health: Government and private programming the game via CATV. Another possibility
agencies are trying to determine what actually is a would be viewer participation in quiz games sent over
"safe" dose of microwaves -a subject in the spotlight one -way cable.
since the discovery that the American Embassy in Baer also forecast two -way game playing between
Moscow was being bombarded with low- intensity homes by telephone connection and prerecorded
microwaves. The only existing standard today for safe home VTR or videodisc programs for interactive games.
exposure is 10 milliwatts -per- square- centimeter, He predicted that game -playing capability would
established by the American National Standards eventually be built into every home VTR or videodisc
Institute. Some tests indicate that this might be too player.
high.
Is public health endangered by broadcast and other CB stability promised: CB manufacturers and dealers
microwave transmissions? Initial results of studies are still reeling from the rough transition from 23- to 40-
indicate it is not. At ground level in immediate vicinity channel units, which caused severe dislocations and
of broadcast transmitters at Mount Wilson, California even a few bankruptcies. Now they're apprehensive
(where the antennas of all Los Angeles TV stations that just when things get going again they'll be
are located), one study showed the maximum ambient clobbered by new FCC efforts to move CB to a
radiation was four milliwatts and that the principal permanent home upstairs in the higher frequencies.
source of microwave radiation is UHF broadcast But FCC Chief Engineer Ray Spence recently told the
stations. If the safe level is found to be much lower PC 77 trade show that the industry can "look forward
than 10 mW, officials of the government's Office of to a period of stability with no new surprises." Other
Telecommunications Policy say some stations may FCC spokesmen conceded the Commission was making
be required to reduce their power. However, at present, long -range studies for new personal communication
experts feel that hazardous exposures are found only spectrum space, but said no action was planned which
in occupational situations where people work on would eliminate the current 27 -MHz band.
microwave -emitting equipment. The FCC has proposed a ban on linear amplifiers
in the 25 -35 -MHz band. These devices, designed for
Backtalk on the cable: A major experiment in two - amateur radio, are being used illegally to boost power
way cable TV will start this year in Columbus, Ohio. in CB equipment. The FCC has made no proposal to
Warner Cable will offer the service to almost 100,000 ban linear amplifiers in other ham bands, but it did
homes there. It will feature a 7 x 6 x 2 -inch home propose a type-a cceptance program for all amateur
terminal that will permit subscribers to select programs, radio equipment, presumably to help block the
play interactive games, take tests, register their manufacture of amplifiers that could easily be modified
opinions instantly and "actually participate at home for CB use. The FCC proceedings are expected to
in TV programs and events." Warner Cable President be protracted, with amateur radio groups strongly
Gustave Hauser says he expects to "see people opposed.
participating in game shows, schools competing Another major problem faced by the CB industry is
against other schools, communities against trying to convince prospective customers that 40-
communities and so forth." Warner, which recently channel transceivers have as much "talk power" as
acquired video game producer Atari Inc., declined to the 23-c hannel transceivers. All manufacturers agree
give further details. that rumors are rampant that the FCC rules make 40-
channel transceivers less powerful. It's not true, but,
2 -way game, 1 -way cable: But you don't necessarily like many rumors, it has some basis in fact. This is
need a two -way cable system to play an interactive that some CB manufacturers lacking in engineering
CATV game. Ralph Baer of Sanders Associates, who resources have reduced the percentage of modulation
is regarded as the inventor of the video game, told a in order to meet the Commission's new tighter
recent meeting of Gametronics in San Francisco that specifications. But the vast majority of well -known
tests on cable TV systems in Boston and Akron showed brands are said to provide full power and full
several ways in which video games could interact modulation in their new transmitters. The entire
-if
with cable. problem you can call it a problem -undoubtedly
One experiment involved the CATV transmission of has been exaggerated by dealers stuck with large
a colorful hockey playing field with four players moving quantities of 23- channel transceivers who have been
at random -two goalies and two forwards. Game bad -mouthing the 40- channel gear.
equipment developed by Sanders recognized the field
and players, introduced them into the game logic VTR fever rises: In a series of fast -breaking
circuitry and permitted interaction between the developments, the home videocassette recorder has
transmitted symbols and the viewer -manipulated locally taken a giant leap toward becoming the next major
generated players. He said CATV could also be used mass -market consumer electronic product in the
with microprocessor games, with digital data on game United States, and the search for a "standard" system
rules, character symbols and the like transmitted to was sharply narrowed down:
storage equipment at the receiver terminal -in effect, continued on page 94
www.americanradiohistory.com
Convenience
is only
half the story.
SBE TOUCH /COM 40
1
SBE adds the ultimate luxury to 40- channel operation: the convenience o
microphone control that puts all CB functions right in the palm of your hand.
QuicHy scan up or down through all 40 channels. or move channel by
channe, with the 2 -speed channel selector. Identify your channel with the am
extra -large, high- intensity LED readout, clearly visible even in bright day-
light. Adjust volume and squelch with the flick of a finger. And to transmit.
simply push the "Press-to-Talk" control. It's all on lie microphone.
But the convenience of TOUCH /COM 40 is onty half the story. With
such sophisticated features as SBE's "Speech Spander" voice -
operated modulation level control, "Anti - Blast" at dio burst protection touc4h c on,
circuit, 4 -pole IF filter, delta tune, and MIC gain ccntrol, Torch /Com 40
offers top performance under the toughest open ting conditions, plus
dependability backed by 100 per cent quality control.
And mat's the half of the story that is the most i'nportartt to you.
40
SBE-43CB
Si iL
Better Communications through Creative Technology
For complete information, visit your nearest SBE Dealer, or write SBE. Inc. 220 Airport Blvd., Watsonville. CA 95076
INTERNATIONAL OFFICES E S Gould Marke'linq Co LI I . Mortn'al Can, rla Linoau SysI 'n s S A -' 'it'v,r I Switzer and
CIRCLE 28 ON FREE INFORMATION CARD
www.americanradiohistory.com
Digital Watch
tinuing to time a lap stored in memory. As
a business executive, you can time long dis-
tance phone calls and interviews. Lawyers can
Brea kthroug h keep track of their services, and doctors can
time the vital signs of their patients. Even
while the chronograph is functioning, you can
still view the time -something even many of
the expensive digital chronographs cannot do.
BUILT DIFFERENTLY
There are several big changes taking place in digital
All wires have been replaced with circuitry
watches. Here are all of them in one product. printed on one single thin surface. On this
same surface are two integrated circuits which
use gold contacts and are hermetically sealed
Your digital watch is either too thick, uses to protect their several thousand micro corn -
up batteries quickly, has just a few functions ponents. The American -made Laser is shock
or is hard to read under certain lighting condi- resistant and uses a tough mineral glass crystal
tions. You still have to press a button, flick to protect the rugged electronics from the
your wrist, or hold your watch at just the everyday water and humidity tortures normal-
right angle to read the time. ly given any watch.
The digital watch industry has gone through NEW QUARTZ BREAKTHROUGH
four years of rapid change, but the disadvan- Digital watch accuracy depends on the
toangee s tcoittaedlly a bnoevwe hparvoed fuincat -lltyh ebe eSne nressoor lvLeads einr qfrueaqrutze nccyry swtaitlh. Esvheonc k thoer abgees t( ecsrypsetcaialsl lyc hwahnegne
4vite4 n0ret ipoDrniegasilte andl.tis g iTtaah le d wrLaaamtsceahret ics4. 4 d0e ips asrot udreif fefrroemn t cthona-t fafiinrrssdtt vpaegrroeydd uectxoep den)n.o sTtiv hese,h tiufLtn asfinreegrq u4f4oe0nrk c uycs ermyss ottarhele. tnIhtea wnis
NO BUTTON TO PRESS five parts per million per year (more accurate
There is no button to press since the display than most radio or TV time signals) so the
glows in the dark. A glass ampoule, charged extreme accuracy you expect is built into
with tritium and phosphor and sealed by a your watch from the first day you wear it.
laser beam, is placed behind the new CDR The crystal is cushioned and solidly bonded
(crystal diffusion reflection) display. When to the crystal carrier eliminating all fine wires
room lights dim, the self-contained tritium that may break from shock. In short, the
light source will compensate for the absence advanced design of the crystal will assure
of light by glowing brightly and illuminating guaranteed accuracy greater than 5 seconds
the display. per month -year after year after year.
No matter when you wear your watch-day The Laser 440 is ideal for pilots because of
or night -just a glance will give you the its cockpit visibility and chronograph func-
correct time. There's no button to press, no tions, perfect for the businessman who de-
special viewing angle required, and most The new Sensor Laser 440 digital watch glows pends on his watch for split- second accuracy
important, you don't need two hands to read in the dark so there's never a button to press and the ultimate watch for anybody who
the time. to read the time in darkness or in sunlight. wants unquestionably the finest digital watch
CHANGE YOUR OWN BATTERIES ever offered at any price.
-
The Laser 440 is only 8 millimeters thick
thinner than many of the so called thin digi- THE ULTIMATE ACHIEVEMENT
tals being advertised today. The new CDR dis-
play draws 100,000 times less current than an Other manufacturers have devised unique
LED watch when displaying the time so your ways to produce a watch you can read at a
single commercially -available Union Carbide glance. The $300 LED Pulsar requires a snap
battery lasts years longer. In fact, part of our of the wrist to turn on the display, but the
warranty includes all the batteries you'll ever Pulsar cannot be read in sunlight and its dis-
need, free of charge, for five full years. To re- play uses 100,000 times the current of the
place a battery, simply open up the battery Sensor display. The $400 Longine's Gemini
hatch on the back of your watch, tap out the combines both an LED and liquid crystal dis-
old battery and drop in the new one. ppllaayy., (aPnrde ssv iea wb uitt toena sailty niign hst ufonrli gthhet LwEitDh dthise- The Laser 440 is not only thin but is designed
liquid crystal display.) But you must still to conform to the contour of your wrist. A
pprleicsast iao nbsu totof ne xtois trineagd tethceh ntoimloeg.y Asllt itllh efsaeil atpo- bwuelkayr- edsipgeitcaila lwlya itfc hy ocua hna vbee cao mthein awnnriosyt.i ng to
produce the ultimate digital watch: one you
can read under all light conditions without HOW WE PROVIDE
using two hands. Until the new Laser 440. THE FINEST SERVICE
Can our company provide better service
than even your local jeweler? We think so. If
And if you've owned a digital watch for a your Laser malfunctions during its unprece-
year, chances are you've had it in for repair dented five -year warranty, just call us on our
more than once -a very common consumer toll -free line. We have made arrangements
complaint. The Laser 440 is so service -free with United Parcel Service to pick up your
and has such high quality that it should rarely, Laser at your door, at our expense, and we
if ever, require service. It is backed by a solid give you a loaner watch to use while your
five -year warranty -your assurance of our Laser is repaired. You pay nothing to have
commitment to this outstanding new product. your watch serviced during its five -year
The Laser 440 has both time and stop watch warranty (that is if service is ever required)
functions. Six digits are on display -four and we are as close as your phone or door.
large digits and two small ones. You choose WHO WILL BACK YOUR
between hours, minutes and seconds or hours, 5 YEAR LIMITED WARRANTY
Most digital watches have dozens of electronic minutes and date by pressing a button. The Two solid companies are behind your new
components. The Laser 440 has only six -two Laser memory remembers the number of days Laser. JS &A is America's largest single source
icnatpeagcraitotersd. cAirlclu ciotsm, pao ncerynststa al raen bdo tnhdreeed mdiricercot- - ifnir sat dmayo notfh t haen dn erwe smetos nathu.t omatically on the oanf ds paa clee a-adgeer pinro edlueccttsro -nai cssu bfosrta onvtiearl ca odmecpaadney.
ly on the printed circuit board. By hermetical- The 440 is also available in an 11 function Our commitment to the consumer and to ser-
ly sealing the integrated circuits and using chronograph (stop watch) and is truly the ul- vice is a matter of record. Check with the
fewer components, the Laser 440 is consider- timate Laser timepiece. You can time two Better Business Bureau in your very own
ably more reliable than other watches that do separate laps of a multilap race keeping one community, the Northbrook, Illinois Cham-
not yet have this complete integration. lap in memory. You can accumulate time; ber of Commerce (312) 498 -5555, or any of
you can view the time of one lap while con- the 100 national magazines and newspapers in
www.americanradiohistory.com
&timely
new
The expensive metal bracelet has the equiva-
lent of 92 finely-h inged links and is complete-
ly adjustable. Simply slide the adjustment
mechanism to the most comfortable position
on the band for your wrist size and lock it in-
to place. Then, whenever you have to put on Zworykin elected to Inventors simplicity of slide projectors makes cir-
your watch, simply hook the strap into the al- Hall of Fame cuitry much less complex than for, say, a
ready pre -set adjustment mechanism and snap TV set. Only four channels are needed,
it shut. It's fast and simple and gives you the two to move the slide cassette forward
most comfortable fit of any watch by con-
forming exactly to the contour of your wrist. and back, one for the projection lamp and
one to control room lighting (a floor or
which we advertise. We realize that a quality table lamp is hooked into the circuit).
watch warranteed for five years is a serious in- The Siemens device uses pulses trans-
vestment and our reputation for service and mitted sequentially on a fundamental
customer satisfaction must be unsurpassed. frequency of 31.25 kHz. The pulse
Most important, check with our customers. lengths, starting at 1.5 ms, are staggered
vFicoer da ltmheo sSt etnwsoor yweaartcs hw. eW eh aavree sporlodu da nodf soeurr- by 0.5 ms from one channel to the next.
record and will gladly share it with anyone Three infrared output diodes are driven by
who inquires. a Darlington circuit. Range is about 15
The Sensor Laser 440 is manufactured ex- meters, and the low power consumption
clusively for JS &A by Micro Display Systems, permits sending 30,000 instructions with a
a leader in the new emerging watch tech- single 9 -volt battery.
nology and a well -financed company backed
by one of the world's major manufacturers.
STANDING BEHIND A PRODUCT
The Laser 440 is everything you would
want in a digital watch: a major advance in
digital watch technology, all the really impor-
tant functions you'll need, a service contract
so solid that you'll never have to leave your
home if service is ever required, and a product
of unsurpassed quality and accuracy. But it is
only after you receive it that you will con-
vince yourself of its beauty, its design, its fit
and the accuracy of our claims. For that rea- DwRh.e nV LhAeD IInMvIeRn tKed. ZthWeO tRuYbeK INhe aiss hheo ldapinpge -atrhede
son we give you a one month trial period. Iconoscope that made our present television
Wear the Laser 440 for one full month. Check transmitting technology possible.
its accuracy, its feel and show it to others.
Compare it to all other digitals. If you are not
totally convinced that the new Laser is the Dr. Vladimir Kosma Zworykin, television
finest digital watch at any price, then return it pioneer, has been elected to the National
for a prompt and courteous refund. Inventors Hall of Fame, joining such nota-
To order your Laser 440 for a personal bles in the communications world as
trial, simply call our toll -free number below Marconi, Bell, Morse, and Edison, and the
and give us your credit card number or send three inventors of the transistor.
us your business or personal check. There are Vladimir Zworykin was graduated in NEW INFRARED REMOTE CONTROL. Chan-
no postage or handling charges (Illinois resi- 1912 from the St. Petersburg Institute of nels are Lamp (electric light for room illumina-
dents add 5% sales tax) and it will be sent Technology, where he made his first tion) Projector, Forward and Back.
to you promptly by United Parcel Service contact with television as student- assist-
unless you specify otherwise. ant to Professor Boris Posing. Afterward
A REVOLUTION IN TECHNOLOGY he did post -graduate work at the College In the receiver, a photodiode, a tuned
There is a revolution taking place in the de France in Paris, returning to Russia at circuit and transistor pick up the infrared
watch industry. Some digitals are getting the outbreak of war in 1914. signals and pass them to an integrated
thinner, some have dozens of new functions Coming to the United States after World circuit that was originally developed as a
ahToanhbvdelie g asnaoetlilmwo nt eh Letcoa ldsfaeeaiamry t.u 4 r4ee0xs c idenop etoison.en aOql rudvaeilsrit iyby ioltiiutmyr.se pNaieto cnneeo. WaUnnadirv erI,er schieteyi v feoirdfs thP iwistt osPrbhku.eDrdg hinf o irPn hWy1s9ei2cs6sti. n fgrIonh mo1u 9tsh2e9e, viptieudmleso.e sI FA oaf mdelpecsliosfid eert hra anntdh ei1s n tmhuss usp taop rleocswles-ae prsr i coeaudllt
he joined RCA as director of the Elec- interference and noise. The individual
White Gold With Time and Date $139 tronic Research Laboratory. In 1947 he signal lengths are then examined and
Gold- plated With Time and Date 159 was elected a vice president and consul- allocated to their correct channels.
White Gold With Chronograph 199 tant for RCA Laboratories, and after his
Gold -plated With Chronograph 219 retirement in 1954 was made an honorary Engineering Consortorium offers
JS &A ranked first among all watch vice president and provided with an office computer courses
manufacturers in total unit sales of at the David Sarnoff Research Center The 1977 Professional Growth in Engi-
quality digital watches during 1976. neering Spring Program of the National
Engineering Consortorium features Mini-
Infrared light controls home slide computer, Microcomputer and Modern
o NATIONAL projectors Signal Processing as well as Design and
GROUP In keeping with the trend toward the use Production of Hybrid Circuits. Eight pro-
of infrared light for remote control of grams are being presented during the
NorthbDroeopkt., RIIAI. 60O06n2e JS &(3A12 P) la5z6a4 -9000 electronic domestic equipment, Siemens week of May 22 -27, 1977, at Pheasant
CALL TOLL -FREE.... 800 323 -6400 says, they have come up with an idea for Run Lodge, St. Charles. IL.
In Illinois call (312) 498 -6900 controlling home slide projectors. The continued on page 12
©JS &A Group, Inc.,1977
www.americanradiohistory.com
Where do
the p eI their
training?
Almost half of the successful TV servicemen have
i home study training and with them, it's NRI 2 to 1.
It's a fact! Among men actually making their living repairing
"IV and audio equipment, more have taken training from NRI
ó
than any other home study school. More than twice as many!
2
8
www.americanradiohistory.com