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MARCH

1976

VOLUME 9,

NUMBER 3

Popular

Electronics®

WORLD'S

LARGEST

SELLING

ELECTRONICS

MAGAZINE

FEATURE

ARTICLES

THE

CARE

&

FEEDING

OF

NiCd BATTERIES

Alex Burr

39

How they

work and

how

to use

them correctly.

HOW TO

MINIMIZE SCOPE /PROBE

COMBINATION

ERRORS

Thomas

R. Sear

54

Choosing

the

right

probe for

a particular

application.

HOW

MULTIPLEXED

LED

DISPLAYS SIMPLIFY

CIRCUITS

Patrick

J.

Delaney

III

62

Reduce size

and complexity

of seven-

segment

readouts.

ENGLISH

-LANGUAGE

SHORTWAVE

BROADCASTS

FOR

MAR. &

APR.

1976

Richard

E.

Wood

92

CONSTRUCTION

ARTICLES

AN LED -READOUT

AUDIO

POWER

METER

Tim

Henry

35

Checks

amplifier output.

speaker

balance

and efficiencies.

THEFT ALARM

FOR

HANDHELD

CALCULATORS

Tommy

N.

Tyler

42

BUILD

"PENNYWHISTLE"

-THE

HOBBYIST'S

MODEM

Lee

Felsenstein 43

Interface

for

digital data

transmission

and

reception.

A BCB LOOP

ANTENNA

FOR

DX'ING

Norman

Fallon

51

Increases reception

range

of

inexpensive

AM

radios.

CURVE

TRACER CHECKS

SEMICONDUCTOR

QUALITY

Samuel

Lyle

58

Used

with

a

scope,

it

indicates conditions

from

breakdown

voltage

to Beta.

COLUMNS

STEREO

SCENE

Ralph

Hodges

20

Tone Controls.

Plain and

Fancy.

SOLID

STATE

Lou

Garner

80

Opting

For

Op

Amps

TEST EQUIPMENT

SCENE

Les Solomon

83

Using

Your

Oscilloscope.

COMPUTER

BITS

Robert

Marsh 88

Computer

Users

Tape

System.

DX LISTENING

Glenn

Hauser 91

Shortwave

News

From All Over.

CB

SCENE

Ray

Newhall 95

Is Your

Station

Ready For an Emergency?

HOBBY SCENE Q

&A

John

McVeigh

97

EXPERIMENTER'S

CORNER

Forrest Mims

100

Percussion

Instrument Synthesizer.

PRODUCT

TEST REPORTS

MARANTZ

MODEL 5220

STEREO

CASSETTE

DECK

ONKYO

MODEL

TX -220

AM

/STEREO

FM

RECEIVER

MIDLAND

MODEL 13 -882B

MOBILE AM CB

TRANSCEIVER

HEATHKIT

MODEL GB -1201

DIGITAL

STOPWATCH

TRI

-STAR "TIGER

SST"

CD IGNITION

SYSTEM

DEPARTMENTS

EDITORIAL

Art Salsberg

4

New

-Protect Stumbling

Blocks.

LETTERS

6

NEW

PRODUCTS

12

NEW

LITERATURE

18

NEWS

HIGHLIGHTS

33

OPERATION

ASSIST

98

ELECTRONICS

LIBRARY

99

ADVERTISERS

INDEX

119

68

70

72

73

78

POPULAR

ELECTRONICS.

March

1976,

Volume

9. Number

3. Published

monthly at

One

Park Avenue.

New

York. NY

10016. One year

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ELECTRONICS

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Guide

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COPYRIGHT

1976 BY

ZIFF

-DAVIS

PUBLISHING

COMPANY

ALL

RIGHTS

RESERVED.

MARCH 1976

Ziff-Davis also

publishes

Boating.

Car

and

Driver.

Cycle,

Flying. Modern

Bride.

Popular Photography.

Skiing

and Stereo

Review

Editorial

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