250-Wattififi Amplifie

100 Pages·2014·11.3 MB·English

BUILD TIGERSAURUS
250-Wattififi
Amplifie
_ 1c
,,,-
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The better the turntable
the fewer the moving parts.
Ours have only one.
The one is theTechnics direct dive DC motor. The improvement is obvious
. .
A DC motor to escape wow, flutter and hum.
FREQUENCY SPECTRUM OF RUMBLE
-
A DC motor that is brushless and spins at .40
-
331/3 or 45 rpm so it doesn't have the vibra:ion 50
and noise problems of its :aster competitors.
60
WOW AND FLUTTER 20 25 30 40 50 60 60 100 200
+0.20 BELT DRIVE DIRECT DRI JE FREQUENCY Hz
+0.10 We makes three direct dive turntables.
o The SL-1100A, shown below, comes with a
-0.10
professional -type tone arm, viscous- damped
-0.20
2 4 cueing, illuminated stroboscope, variable
BELT DRIVE DIRECT DRIVE TIME Min.
pitch controls and a dust cover.
And it has an analog feedback speed control The SL -1200 includes most of the same
so it never suffers from frequency or voltage features at a more modest price. And the
fluctuations.
SP -10 is for those who insist on choosing their
The drive system is just as important as own tone aim.
the motor. And direct drive doesn't depend
Either way. The concept is simple.
on an idler wheel or belt. They had to go The execut: cn is precise. The performance is
because they sF:ow their age and lose their outstanding. The name is Technics.
shape. Instead we put the platter right on the clinics
motor shaft.
bv Panasonic
__
...
200 PARK AVE., t. Y., N.Y 1n0t7,
FOR YOUR NEAREST AUTHQR'fM
TECHNICS DEAL:., CALL TOLL FREE
800 447-4700. W. ILLINOIS, St:C :322:--4O0. _`
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How to start making it
early in life.
(A TRUE STORY)
Since he got out of the Navy, John the training I'm getting from ICS, I know I the air- conditioning department. I also
Muirhead of Gales Ferry, Conn., has pro- can do it. picked up business of my own on the side.
vided well for his family. "In fact, my ICS training helped me That's helping to pay for my new house."
Two cars. A new house going up along- get the first job I ever applied for. I won The right combination for success
side a wooded lake. Even a handsome Great out over rwo guys with college degrees.
Dane named Sherman. Even though I had no experience. John has the right combination for
But John has bigger ambitions. "Naturally, I was nervous at first. So I success. He's in a growing field. And he
"I want my own air- conditioning busi- took my lesson diagrams with me on the has good training for it.
ness. Doing installations and repairs for job. And I could lick any problem. You could, too. Especially if you're
homes, offices, restaurants, motels. And with "Pretty soon, they asked me to head up interested in one of the fast -growing careers
ICS specializes in: Accounting. Engineer-
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Ideal way to learn
As an ICS student, you study at home,
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I am under no obligation.
Electrician Air Conditioning/
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Motel /Hotel Automotive
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Check for special booklet. if 16 or under.
XA680R
Name Age
Address
City
State lip
Telephone
Soon, a new home bulk on a wooded lake site will give John and Cheryl Muirhead lots of room for
APPROVED FOR VETERANS TRAINING APPROVED FOR FEDERALLY
their growing family (Photo: Frank Cowan) INSURE DI OANS ACCREDITED BY NATIONAL HOME STUDY COUNCIL
i
DECEMBER 1973 RADIO- ELECTRONICS
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PS
SONY 2251:
a declaration of independence.
Independence of belts, pulleys, And because our motor turns so much it from externally caused vibrations.
idler wheels and all the other para- slower than conventional ones, the At $349.50 (suggested retail) includ-
phernalia that can cause wow, flutter rumble frequency is lowered too, ing arm, wood base and hinged dust
and rumble. Independence from fluc- making the rumble even less audible cover, the PS -2251 is today's most
tuations in power line voltage that than that -58 dB figure indicates. advanced turntable.
can effect the precise speed of the To maintain precise speed We also offer a moderately
turntable. And independence of acous- accuracy at slow speeds, we use an priced, single -play component turn-
tical feedback. The new, direct -drive AC servo system (superior to a DC table with the convenience of auto-
Sony PS -2251 has declared itself servo system because of its uniform matic operation, the PS -5520. The
independent of all these potential magnetic field strength). Its precise complete system: turntable, arm,
intruders upon the enjoyment of speed is not affected by variations in walnut base and hinged dust cover,
your records. line voltage or in line frequency. But $159.50 (suggested retail) Sony
Most turntables use belts, its speed can be varied ± 4% by the Corporation of America, 9 West 57th
pulleys, idler wheels to make their built -in pitch control and returned to a Street, New York, New York 10019.
turntables spin at the record's speed, precise 33 -1 /3 or 45 rpm, with the
instead of the motor's. Look under- built -in self -illuminated strobe.
neath Sony's new PS -2251 and all Then we matched it with a stat-
you'll see is the motor. We don't need ically- balanced tonearm that tracks
all those extras, because our motor's records as precisely and faithfully as
speed is precisely the same as the our turntable turns them. We added
record's. viscous- damped cueing and effective
Eliminating all those parts a so anti- skating. And we mounted the
eliminates the wow and flutter and PS -2251 on a handsome wood base
rumble they can cause. So, our rumble using an independent spring sus-
figure is a remarkable -58dB (NAB) pension system to completely isolate
2 RADIO -ELECTRONICS DECEMBER 1973 Circle l on reader service card
www.americanradiohistory.com
Radio -Electronics.
ELECTRONICS
F O R M E N W I T H I D E A S I N
More than 65 years of electronics publishing DECEMBER 1973
ó7`Do//oGíi
COLOR 37 New Circuits For '74
TELEVISION Exciting new circuits highlight the '74 sets. Here's a
preview for you. by Steve Leckerts SEASON'S
NA,
40 Remote Control For Color a gREETINGS
You'll be surprised at the new color remote features. by
Karl Savon
51 10 Ways To Use Your Vectorscope The editors and staff of °0
How to master low -level circuits and speed
`pl `J
troubleshooting with your vectorscope. k!dio-électronics extend
o
by Robert G. Middleton
61 Service Clinic best wishes for the holi- p
Off -color problems. by Jack Darr
t, day seoason .
70 Reader Questions
R -E's Service Editor solves reader problems.
°í .a
BUILD 43 TIGERSAURUS- 250 -Watt Hi -Fi Amplifier
THIS ONE Less than 0.2% distortion at full rated output -a dream of
a quality high -power amplifier. by Dan Meyer
SOLID -STATE 33 CMOS -Why Is It So Good?
ELECTRONICS New, micropower IC's you're going to see a lot of. Learn
how they work. by Don Lancaster
54 Design Your Own Regulated Power Supplies
Working with the latest IC technology to come up with
custom -tailored power supply circuits can be easy -once
you know what to do. by Don Lancaster CMOS, A NEW BREED of micropower IC's.
58 R -E's Transistor Replacement Guide Learn how they work and see what you can
165 more replacement transistors by 8 different do with them. . . . see page 33
manufacturers are presented in this issue. by Robert &
Hugo Gernsback (1884 -1967)
Elizabeth Scott
founder
M. Harvey Gernsback, editor -in -chief
and publisher
Larry Steckler, CET. editor
Robert F. Scott, W2PWG CET, technical editor
Jack Darr, CET, service editor
HI -FI 48 Two New Hi -Fi Speaker Systems I. Queen, editorial associate
STEREO British Industries and Electro -Voice make news Leonard Feldman, contributing high -fidelity editor
David Lachenbruch, contributing editor
AUDIO with their latest developments in quality speaker systems. Barbara Schwartz, editorial assistant
by Leonard Feldman Vincent P. Cicenla, production manager
Sarah Martin, production assistant
H. Matysko, circulation
Arline R. Fishman, advertising coordinator
Cover photograph by Walter Herstatt
GENERAL 4 Looking Ahead Cover design by Louis E. Rubsamen
ELECTRONICS Tomorrow's news today. by David Lachenbruch
Radio -Electronics is indexed in Ap-
26 ASppepelida nccoen tCrolilnsi ca nd black boxes. by Jack Darr paLlniiteded r aRStuecraieed.n ecres 8G uTideec htnoo loPgeyr ioInddiceaxl \nU _t I!.t
57 Annual Index
Complete directory of all articles that appeared in Radio - Rmaodnitoh- lEy lebcy trGoneircnss,b aDcke cPeumbbliecar tio1n9s7.3 . InVco.l,. 20404 , PNarok. A1v2e. nuPeu bSlioshuethd,
Electronics during 1973 aNnedw Yadordki tiConitya l1 0m0a0i3li.n gS eocfofinced.- clOanses -pyoeasrta gsueb psacidri patti oNne wra Yteo: rkU, .SN. AV. .
U.S. possessions and Canada. $7. Pan -American countries, $8.
Other countries. $8.50. Single copies 606. 01973 by Gernsback
Publications. Inc. All rights reserved. Printed in U.S.A.
Subscription Service: Mail all subscription orders, changes. corre-
spondence and Postmaster Notices of undelivered copies (Form
3579) to Radio- Electronics Subscription Service, Boulder, Colo.
DEPARTMENTS 95 Books 16 Letters 80302.
6 New & Timely 83 New Literature Am ittsetda mmpeadn ussecrlfi-p atsd darensds/eodr aertnwvoerlok peo r mphuostto garcacpohmsp aif ntyh eiar ll restuubrn-
is desired should they be rejected. We disclaim any responsibility
80 New Products 93 Next Month fgorra pthhes wlohsisle oirn doaumr apgoes soef ssmioann uosrc roipthtse rwainsed. / or artwork or photo-
As a service to readers, Radlo-Electronics publishes available plans or information relating to newsworthy products, techniques and scientific and
technological developments. Because of possible variances in the quality and condition of materials and workmanship used by readers, Radio-Elec-
tronics disclaims any responsibility for the safe and proper functioning of reader -built projects based upon or from plans or information published in
this magazine
DECEMBER 1973 RADIO -ELECTRONICS 3
www.americanradiohistory.com
looking ahead
seen on many sets as chan- right, but front or rear, up or well as directionality and dis-
Sophisticated Europe nel indicators. One 26 -inch down, and even to gauge the tance so accurately, its devel-
color set by Loewe Opta has distance of the speaker from opers are now attempting to
West Berlin -To an Ameri- a built -in digital clock with the microphone. One segment free it from the restrictions of
can observer, Berlin's recent Nixie readout, which also of the tape represented a headphones, and at press
International TV -Radio Expo- functions as an on -off timer, cocktail party with several time, were planning to dem-
sition was a real eye- opener. while the Nixies double as conversations occurring si- onstrate a loudspeaker setup.
It drew more than 600,000 at- channel indicators. multaneously in different parts The system will use four
tendees, some 30% of them Remote control, a much of a room -and the sensation speakers, placed in a conven-
traveling from West Germany simpler proposition with elec- was so realistic that the lis- tional four -channel arrange-
across East German territory tronic tuning -since no mo- tener could actually choose ment, but with a special rear -
via plane, train and car, to tors are required -is available which conversation to eaves- channel amplifier and modi-
see new models of home in all makes, sometimes as an drop, switching his attention fied frequency response in
electronic equipment and add -on option, using a spe- from one to another at will. the speakers. They claim that
watch continuous TV and ra- cial module. Some remote-s The system was used at some points in the listening
dio originations in about a have as many as 20 buttons Sept. 3 in an FM- stereo area, the results will be a-s
dozen studios on the huge 12 separate channel buttons broadcast by RIAS Radio, good as with headphones
exhibition grounds. plus two buttons each for Berlin, and a tape of portions but that in the entire room
Color TV was probably the brightness, contrast, volume of the science -fiction drama the sound will be better than
biggest attraction -simply be- and on -off. NordMende is of- was played for visitors to the four -channel "because the
cause there's a huge color fering a remote control unit exposition. timbre is correct."
boom in Europe now. In with eight channel buttons The developers -Drs. Ralf
terms of sales, West Europe and including a two -hour on- Kuerer, Georg Plenge and
is at the same point where off timer in the wireless hand- Henning Wilkens of Berlin's Videodiscs' debut
U.S. color was in 1966. In held unit. Heinrich Hertz Institute -call
terms of product sophis- Two manufacturers experi- their system " Kunstkopf," or Telefunken used the Ber-
tication, it could be far mented with wireless remote "Dummy Head." Originally lin show as the launching
ahead -because the public listening. NordMende showed developed for the measure- platform for commercial sales
appears to be willing to a developmental headset sys- ment of concert -hall acous- of its home videodisc system,
spend from $850 to more tem operated from the set by tics, the dummy head is an which it identifies by the
than $1,250 for a large - infrared transmission, while exact -scale model of a hu- tradename "TED." Described
screen color set. Philips demonstrated a similar man head, made of a hard - previously in Radio- Electron-
unit using an ultrasonic car- rubber material with an ics, the TED system uses a
rier. Blaupunkt is offering a acoustical impedance similar thin, flexible 7 -inch disc
TV developments color set which provides on- to that of a human head. In- which spins at 1,500 rpm on
screen channel indication -a side a faithful replica of each a cushion of air, with a sled -
In Germany, at least, color yellow number on a black ear canal is a solid -state min- like "pressure stylus" serving
and monochrome TV have background shows at the up- iature condenser microphone, as the transducer. The discs
now reached the point where per right -hand corner of the with all conditions arranged play 10 minutes in color, and
virtually everything is solid - picture for one to two sec- to exactly simulate the sound a catalog of about 500 hours
state, most sets having modu- onds after the channel is pressure of human hearing. of selections- varying from
lar construction. Manufac- tuned by remote -control se- For acoustical measure- animated cartoons to lecture
turers are quickly moving lector (a somewhat similar ment purposes, the dummy courses for physicians -was
away from the 90 deflection device is offered by Hitachi head is already in production placed on the market. In Ger-
picture tube to the slimmer and Sharpe in the U.S. and by the professional audio many, the TED player will re-
110 models. And, of course, Japan). equipment manufacturer tail for about $450 and discs
almost all sets use electronic Georg Neumann in Germany for $4 to $10 each, depend-
varactor tuning -a simpler and sells at about $1,500 -but ing on their particular pro-
proposition in Europe than in 'Head stereo' it has never previously been gram content.
the U.S., because there are exploited for recordings A version of the TED
fewer stations and, therefore, If there was any single aimed at the consumer. As player designed for the Amer-
less possibility of adjacent - major sensation at the show it the system currently stands, ican NTSC color system (the
channel interference. was a new adaptation of an recordings from the head mi- disc revolves at 1,800 rpm
The tuning knob went out old principle in audio which crophone can be made o-n but still plays for 10 minutes)
years ago, and now pushbut- provided astounding direc- any two -channel medium was also demonstrated at the
tons seem to be on the way tionality and realism from tape or disc -and reproduced show, as was a devel-
out, too, yielding to the but- two -channel tape. Using stan- on standard equipment with opmental disc changer with a
ton which merely has to be dard stereo headphones, lis- conventional stereo head- 5- second changing cycle.
touched. Touchbuttons are teners could hear sounds phones.
showing up on audio equip- which actually appeared to be Because the technique re- by DAVID LACHENBRUCH
ment, too. Nixie tubes are coming not only from left or produces room acoustics as CONTRIBUTING EDITOR
4 RADIO- ELECTRONICS DECEMBER 1973
www.americanradiohistory.com
Stocking these 9 ECGTsemicondu'ctors
of
like having hundreds high - voltage
is
rectifiers on hand.
Just nine Sylvania ECG high -voltage
rectifiers and triplers can replace
hundreds a. other types .hat are lurking
under manufacturers' part numbers in
manydiffelent TV sets.
we've also out together a brand -
new cross- reference guide
(E:',G -212E that makes iteasy
fa_ voa to find cut which .
ECC semiconductor replaces
which mar_ufacturer's
numl_er.
And the guide isn't just
limited to rectifiers and tripiers.
It covers over 75)000 par: numbers
in all. including industrial
replacements.
Because so few Sylvania ECG
componen=s replace so many others, it's
easy for you to have the part your
customer wants
When he wants it.
call
SYLVANIA
GTE ày v®;. necterstc Co-tvaoents, Walthm Mus. 02154
DECEMBER 1973 RADIO- ELECTRONICS 5
www.americanradiohistory.com
timely
new
&
Charge- coupled devices min - Using cnarge -coupled devices (Ra- car must be rushed to the sine. But in
iat,frize new TV camera dio- Electronics, Jima 1971. page 6) the many cases, there is no burglar, no good
A TV camera -hat measures only S' x new M J -100 camera has an ar-ay of 10,000 reason for the signal.
1'rí x 21/4 inches and weighs only 6 ounces photose isors assembled on a standard 24- Most of the alarms a-e caused by
(without lens) has beer demons:rated oy p n dual in -line p2c<age. Each line of sen- careless users, the police say. "They
the Space & Defense Systems division of sors is elected by lip: like a similar line of forget the system is 'on' and open a
Fairchild Camera & it strument Corp. e ements in a vidicon tube, but urlike those door or wincow,' says one officer Poo -
it the tube, they do not require scanning by installations are another cause of
al electron beam. The charge on each ele- trouble, and the owner or a new alarm
ment, nduced by the light falling on that system occasionally sets it off in-
e errent, is conveyed along t-le line from tentionally, just to see how 'ong it will
oie element lo the next by a step -by -step take the police to arrive.
process contolled by a clocking system, A recent report of the New York City
and delivered at the end of tie line as a police cepartment points up the serious-
standa-c television sonal. ness of the situation. In one two -week
The resoluticn of the MV -100 is 16 period, 9,602 alarms were received, only
I nes pee mi meter tie horizontal scan- 141 of which were found to be valid. The
ning treouency i; 15.750 I res and the department estimated that 3.461 man -
vertica' 12C frames per secord. Video hours were wasted on t-tese false
output is. 1 volt peak -to -peak. and band- alarms. at the expense of the New York
width MHz- The camera can be used taxpayer and the safety of the populatior
on ord nary a: or with a battery pack for deprived of that much police service.
portable use New York City is by nc means an
exception. Tie town of Tenafly, New
Burglar alarm systems not all Jersey, has only about 2)0 alarm .sys-
joy to police tems on its control board. let it found
The rapidly growing home and in- the false alarm situation so unbearable
dustrial .ntrusion a arm system business that it ir.stitu'ed a penalty system. Sub-
has been picked up tappily )y numbers scribers are now allowed three false
of electronic ser.ice organizations, who alarms a yea'. A fine of $15 is imposed
fird itl profitable to sail and i ^stall them. for the fourth, $25 for the fiti, and the
FAIRCHILD MV -100 TV CAMERA measures The of ce departments who monitor sixth means teat the system will probably
31/2 t 1 b, x V. Inches (without lens) and those alarms are not always so happy. be disconneced from the police board.
wraeniggeh s o6f oliguhntc esle. veItl s o,=enrad teists opvoewr era wcoicne- The trcuole is -false alarms! Every time The method has worked well -the
sumption is low. a signal appears Dri the station board, a number of false alarms has dropped
from 50 to 6) a month to four or five.
Other towns have followed suit, and
some slap on a $50 fine immediately af-
ter the first th-ee "free calls.'
Molten lithium may solve con-
trolled fusion problem
g'
A study cf the use of h -power la-
sers to procuce con:rolled thermonu-
clear fusion, now under way at the Uni-
versity of Rochester, may solve the
problem of containing the plasma. At its
temperature of 100 million degrees it
cannot be held in a vessel of any kncwn
material. The approach being taken by
the University, with support from General
Electric Co., Esso Research and Engi-
neering, and Northern Utilities, is to ab-
sorb the energy generated by fusion re-
action in small quantities 01 material in a
liquid medium, which will be circulated
to release the power in the form of heat
In one proposed approach a spheri-
NEW GLASS -FIBER MAKING SYSTEM, devised by Ray Jaeeer and Waller Logan at Bell Labs, cal vessel is filled with molten lithium.
uTshee s la3s ecra ribs ona hciigohxllyd ec olanttreorl latob lem ealtn da -mglaossst iomca sort atnhia -t aii cmleaa nb es ou:yracwe no fi nhtoe aat , fwibheer aea ams ilceo nlvoenng-. Pellets of frozen deuterium (heavy hydro-
tional heaters put minute impurities into the class. (continued en page 12)
6 RADIO -ELECTRONICS DECEMBEF 1973
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THE NEW SELF -SERVICE
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FOR SERVICE TECHNICIANS
A NEW family of
± 5 Carbon -Film Resistors
%
' at carbon -composition prices
plus well -known Blue Jacket®
vitreous enamel wirewound types!
Your replacement resistor headaches are over.
Now you can find practically all the resistors you
need for the home /mobile entertainment and
communications equipment you service, hang-
ing on the all -new self- service Resistor Q -MART
at your Sprague distributor's store.
...
It's designed with you in mind to put the
more popular resistance values, in the more pop-
ular wattage ratings, at your fingertips. Choose
from 1/4, 1/2, 1, 2, 3, 5, and 10 watt carbon -film and
wirewound resistors. Resistance tolerance is
-±5 %, not the wider '_10% that you get with
most carbon -composition lines. And, unlike
lower- quality carbon -composition types, Sprague
carbon -film resistors provide 80% greater sta-
bility with temperature change, and four times
the shelf life. The Sprague Resistor Q -MART is
rounded out with Blue Jacket vitreous enamel
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You'll appreciate serving yourself from your
Sprague distributor's Q -MART. Resistors are
packaged in handy, rigid, reusable Kleer -Pak"
plastic boxes mounted on cards showing ratings
and other useful service information.
One more thing. You'll never waste time hunt-
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only popular resistors .. the hottest replace-
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Stop at your Sprague distributor's Q -MART today for
the cream -ot- the -croo in resistor replacements. SPRAGUE
THE BROAD -LINE PRODUCER OF ELECTRONIC PARTS THE MARK OF RELIABILITY
Circle 2 un reader service card
DECEMBER 1973 RADIO- ELECTRONICS 7
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Kit for kit,
text for text,
for
dollar dollar, your
!1
best home training
buy is
NRI
NRI "hands on" method gives you as much as 2 years
of on- the -job experience. Pick your field and enroll now!
After over 55 years of training men for Electronics in izes, dramatizes subject matter so that any ambitious
their homes, NRI knows that theory alone is not man, regardless of his education, can effectively lea-rn
enough. That's why NRI concentrates so heavily in and profit from the Electronics course of his choice
the development of special training equipment. Your and NRI gives you 15 training plans to choose from.
hands must be trained as well as your head, and NRI
gives you both kinds of training in a manner no other Over three -quarters of a million men have enrolled
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ence you get when you choose NRI for your Elec-
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You get your hands on professional parts and demon- tronics training proof of why NRI continues to be
strate theory you read in NRI's unique "bite- size" the country's largest Electronics home -study school.
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NRI's remarkable teaching method simplifies, organ-
8 RADIO -ELECTRONICS DECEMBER 1973
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