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Popular Electronics
WORLD'S LARGEST SELLING ELECTRONICS
MAGAZINE
JANUARY
1982/$1
HOW
TO
ADD
Safe,Convenient
Shutoff
to Smoke Detectors
Real
World"Sígnal
Handling
toTRS
-80
Computers
Overseas
Broadcast
Reception
to
Any
AM
Radio
X70
Decoder
for
New
C
Records
Enjoy
20
-dB Noise
Reduction
From
In- The
-Groove Encoding
Tested
in
this
Issue:
0
4024
14
Technicolor Portable Video
Cassette
Recorder
dBase
II
Computer
Software
EPI
Model
A300
Speaker
www.americanradiohistory.com
Reddy
China
improves
his
vision
with
an
Apple.
Reddy
is
an
optical
engineer
who's
used
to
working
for big
companies
and
using big
mainframes.
But
when
he started
his
own
consulting
business,
he
soon
learned
how
costly
mainframe
time
can
be.
So
he
bought
himself
a
48K
Apple
II
Personal
Computer.
And,
like
thousands
of
other
engineers
and
scientists,
quickly
learned the
pleasures
of
www.americanradiohistory.com
cutting
down on
shared
time
and
having
his
own
tamper-proof data
base.
His
Apple
can
handle
formulas
wi
up
to 80
vari-
ables
and
test
parameters
on
250
different
optical
glasses.
He
can
even
use
BASIC,
FORTRAN,
Pascal
and
Assembly
languages.
And
Apple's HI
-RES
graphics
come in
handy
for
design.
Reddy
looked at
other
microcomputers,
but
chose
Apple
for
its
in
-depth
documentation,
reliability
and
expandability.
You
can
get
up
to
64K
RAM
in
an
Apple
II.
Up
to
128K
RAM
in
our
new
Apple
III.
And
there's a
whole
family
of compatible peripherals,
including
an
IEEE-488
bus
for
laboratory
instrument
control.
Visit
your
authorized
Apple
dealer
to
find
out
how
far
an Apple
can
go
with
scientific/
technical
applications.
It'll
change
the
way
you
see
things.
The
personal
computer.Ì
Or
write:
Apple Computer
Inc.,
10260
Bandley
Dr.,
Cupertino,
CA
95014.
CIRCLE NO.7
ON FREE
INFORMATION CARD
For
the
authorized dealer
nearest you, call (800) 538 -9696.
In
California,
call (800) 662 -9238.
IF
YOUR
VIDEO
INVESTMENT
IS
SHOWING
DIMINISHING
RETURNS,
your picture could be suffering from
dropouts
or
bleeding colors.
Annoying
problems
you
didn't
bargain
for
when you invested
in
your video
equipment.
Before you
go
out and
junk
your
deck,
think
about
this. The
wrong
videotape
can turn
your
investment
into
a loss.
It's
just
the
way
the system
works.
Tape
passes
along
video
heads
that spin 30
times
a
second.
The result-
ing friction can
cause
oxide
particles
to
shed,
and drag
parts
of
the picture
along
with
them.
You're left
with
dropouts.
Or
bleeding
col-
ors
caused
by
poor
signal-
to-noise ratio.
Or
other
video
headaches.
and
excellent
tape
-to
-head contact.
With
all
this
going
for us,
it
should come
as
no
surprise that
TDK
knows video
inside and
out.
We
were involved
in
the earliest
stages
of
home
video,
and
have participated
in
every
step
of
its
develop-
THE
SOLUTION
IS
SUPER
AVILYN.
For
the
first
few
plays,
all
quality
videotapes
can
perform
well.
Crisp
images.
Bright
colors.
A
steady
picture.
But wait until
the tape
has
been
played
a
few
times. That's
when
one
really
starts
to show
its
worth.
TDK
Super
Avilyn.
It
handles the
rigors of
videotaping,
and triumphs.
Super
Avilyn
high
energy tape
particles
are an
optimal size
and
shape
for
perfect alignment,
giv-
ing
superb
signal
-to
-noise
ratio. They're
densely
packed and secured on the tape surface,
which
is
polished
mirror-
smooth.
The
particles
are there
to
stay,
even
under
their
severe
working
conditions.
So
your picture
is
there
to stay.
Surrounding the
tape
is TDK's
super
precision mecha-
nism.
It
gives
jam
-
proof
performance
ment. Today
TDK
supplies
component
parts,
in-
cluding video
heads,
to
major
VCR
manufacturers.
So
it
stands
to
reason
Super
Avilyn
is
remarkably
compatible
with
just
about
any
VCR
you
can
buy.
Look
at
it
this
way.
Once you know how
your deck
works, you'll
see
that the future
of your video
in-
vestment
really
depends
on the tape.
With
Super
Avilyn,
you'll
see
the dividends, again
and again.
&TDK
THE
VISION
OF THE FUTURE
SUPER
AVILYN
2
CIRCLE
NO
44
ON
FREE
INFORMATION
CARD
POPULAR ELECTRONICS
JANUARY 1982
VOLUME 20, NUMBER
1
Popular
Electronics
WORLD
S
LARGEST SELLING ELECTRONICS MAGAZINE
Feature
Articles
$70
DECODER FOR NEW
CX
RECORDS
/John
Roberts
Provides 20 dB noise reduction
when
used
with CX-
encoded
records.
FOR
PROJECTS THAT LAST
DERATE YOUR COMPONENTS
/Char
/es
Hansen
Guidelines to enhance circuit reliability and
component
lifetimes.
ENGLISH BROADCASTS AUDIBLE
IN
NORTH
AMERICA
/Glenn
Hauser
39
45
-
83
49
59
62
65
68
BECAME THE
LARG
EST
SELLING
CB
ANTENNA
IN
JUST
ONE
YEAR!
Vex-444e
O
WHY
K40
Construction
Articles
ANALOG-DIGITAL CONVERTER
FOR TRS
-80
INTERFACING
/Ado
/ph
Mangieri
Connect analog voltages
to
your
TRS
-80 microcomputer.
A
SCIENCE FAIR PROJECT
FOR YOUR
YOUNGSTER:
THE ELECTRONIC ELECTROSCOPE
/K.
Kunde
strong electrostatic
field
exists.
DESIGNING WITH THE
8080
MICROPROCESSOR
/Randy
Carlstrom
Part
5
Morse -Code Hardware Interface
A
SIMPLE SHORTWAVE CONVERTER
FOR ANY AM
RADIO
/Jeff
Hirschl
a
Indicates
when
OFFERS
A
ADD
A
SAFE, CONVENIENT SHUTOFF TO SMOKE DETECTORS
/Pau/
Danzer
Provides temporary shutoff and restores
power
automatically.
MONET
BACK
DOUBLE GUARANTEE
Equipment Reviews
EPI
MODEL
A300
SPEAKER
16
2
1
TECHNICOLOR MODEL 212
VCR
ASHTON-TATE dBASE
II
COMPUTER SOFTWARE
31
KEITHLEY
MODEL 128 DMM
69
14
Columns
ENTERTAINMENT ELECTRONICS
/Ivan Berger
CX Noise
Reduction
in
Perspective
COMPUTER BITS
/Car/
Warren
TRANSMITS
FARTHER
RECEIVES
CLEARER
...THAN ANY ANTENNA
IT
REPLACES!
Another
Small
Computer.
FUNDAMENTAL FACTS
/Walter
Buchsbaum
Noise Fundamentals.
SOLID -STATE DEVELOPMENTS
28
72
74
76
78
80
90
/Forrest
M.
Mims
Bubble
Memory Developments.
HOBBY
SCENE/
Leslie
Solomon
/Leslie
Solomon
EXPERIMENTER'S CORNER
/Forrest
M.
Mims
COMPUTER
SOURCES
A
ceviti
Programmable Function
Generator.
egitte'
PROJECT
OF
THE
MONTH/
Forrest
M.
Mims
A
Sound -Effects Generator.
Departments
EDITORIAL
/Art
Salsberg
Mickey Mouse
in
the'
Courthouse.
LETTERS
NEW
PRODUCTS
4
6
8
ELECTRONICS LIBRARY
OPERATION ASSIST
94
98
103
104
AN
AMERICAN
MADE PRODUCT
FROM
AN
AMERICAN COM'ANY.
ADVERTISER'S
INDEX
PERSONAL ELECTRONIC NEWS
COVER PHOTO
BY
JAY
BRENNER
Copyright
s
1981
COPYRIGHT
©
1981
BY ZIFF -DAVIS PUBLISHING
COMPANY.
All
rights reserved. Popular Electronics
(ISSN
0032 -4485) January
1982,
Volume 20, Number
1.
Published monthly
by
Ziff -Davis Publishing
Co., at One
Park Ave.. New York,
NY 10016.
Richard
P.
Friese, President; Selwyn Taubman, Treasurer; Bertram
A.
Abrams, Secretary.
One
year subscription rate for
U.S. and
Posses-
sions, $15.00; Canada. $20.00;
all
other countries, $23.00 (cash orders
only,
payable
in
U.S.
currency). Second Class Postage
Paid
at New
York,
N.Y.
10016 and at
additional
mailing
offices. Authorized
as second
class
mail by the Post
Office
Dept..
Ottawa,
Canada,
and for
payment
of
postage
in
cash.
POPULAR ELECTRONICS
including
ELECTRONICS WORLD,
Trade Mark Registered.
Indexed
in
the
Reader's
Guide to
Periodical Literature.
Ziff -Davis also
publishes Boating,
Car and Driver, Cycle, Flying. Popular
Photography,
Skiing.
Stereo Review, Electronic Experimenter's Handbook,
and
Tape Recording
&
Buying Guide.
Forms 3579 and
all
Subscription Correspondence:
POPULAR ELECTRONICS.
Circulation Dept.
P.O.
Box 2774. Boulder,
CO
80302. Please allow
at
least eight weeks for change
of
address, enclosing,
if
possible,
an
address label
from
a
recent issue.
Permissions.
Material
in
this publication
may not be
reproduced
in
any form
without permission. Requests for permission should
be
directed
to John
Babcock, Rights
and
Permissions, Ziff-Davis Publishing
Co., One Park Ave., New York, NY 10016.
Call
your
local
CB
Dealer
©
Copyright
i1Mti
1979
;\N
z1V
t
Elfin.
Illinois
{1(
_vii
American Antenna
I
CIRCLE NO.
5
ON
F
Fora
FREE
demo!
Rff
JANUARY 1982
INFORMATION .ìwRD

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