Popular_Electronics 1982-06.pdf

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WORLD'S LARGEST
SELLING ELECTRONICS
MAGAZINE
JUNE
1982/$1.25
How
to
Get
Stereo Sound
from
TV &VCRs
Wireless
System
Stops
Burglars
Beforelhey
Enter
Add
a
Status
Monitor
to Extension Telephones
Big
-
Computer Performance
from
a
Pocket
Computer
Tested
in
this
Issue:
96
o
Del°g
r
a68ssf.0e
loe
N,
$t.
14
wiiyR..,..,
''mputer
System
£
kudio/Video
Control
Amplifier
-C
Noise Reduction
Processor
the
Idea
of a
Computer
You
Could
Put
in
Your
Pocket
Was
Just
-Isaac
Asimov
"A
Few
Years Ago,
Science
Fiction."
Renowned
Science
and
Science
-Fiction Author
0000®00000p©©00
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0000
MISS
Winn
IMO
ooóoai00000O©©o®
IS®©o
Today,
Pocket Computer
-And
That's
a Fact!
like
a
Just
'149.95
Buys
a Radio
Shack
TRS
-80®
Programs
and data stay in
memory
even when
the Pocket
Computer
is
turned
off.
And it
can also
function just
Back when
computers
filled
entire
rooms,
Isaac
Asimov
was
writing
about computers
you
could hold
in
your
hand.
"Radio Shack's
TRS
-80
Pocket
Computer turned my
dreams
into
reality. Now
I
can
take the power
of
a
true computer with
me
wherever
I
go,"
says
Asimov.
The
TRS -80
Pocket
Computer
is
programmable
in
BASIC.
Isaac,
however,
would rather write
novels than
programs. "If
you're like
me,
you'll
want to
get
a
low
cost interface
that
lets
you
use
Radio Shack's ready
-to-
run
programs." There
are
programs for engineering,
finances,
statistics
-even
real
estate and
aviation.
calculator-
something
a
desktop
computer
can't
do.
"With
a
TRS -80
Pocket Computer, you
can
hold the future
in
the palm
of your
hand."
Add our
$79.95
Minisette®-9
cassette
recorder
and
a
Cassette
Interface
for
$29.95,
or
a
Cassette
Interface
with
built
-in
printer
for
$127.95.
They're
all
as
close
as
your
nearby
Radio
Shack store, dealer
or
Computer
Center.
r
The
ftadie
IhaeK
biggest
little
name
in
want
a
glimpse
of
the
future-
send
me
a
TRS-80
computer catalog.
I
NAME
Radio Shack, Dept.
82
-A -502
1300
One
Tandy Center
Fort Worth, Texas
76102
computers®
L
ADDRESS
CITY
STATE
ZIP
Retail prices may vary
at
individual
stores
and dealers.
J
Digital
Watch
Radio
a
When
people
see you
plug
stereo
headphones
into
your
digital
watch,
they may wonder.
Walkman,
move
over.
The
samarium headphones and
the
Digital
Watch Radio
produce
find
hard
to
believe.
strong sound you'll
It
all
makes sense.
If
you
wear your digital
watch most
of the
time just adding
an
alarm,
a
chronograph,
and
even
an
hourly chime might
make
it
more appealing.
But
adding
a
radio,
that tops
it
all
The Advance Digital Watch Radio
is
exactly
that
a
full- featured digital watch
with
a
built
-in
AM radio that lets you listen
to
music, news
and
sports anytime, anywhere
-all
with
a
sound
so
powerful that you'll shake your
head
in
disbelief.
Remember your surprise
the first time you
listened
to
a
Sony
Walkman
or
to
one of the
new headphone radios? Remember
the
sound
quality,
the deep bass response
and the crys-
tal
clear
highs? That's what you'll discover
from that little sound package
on
your wrist.
But wait,
there's
more.
NO
EASY TASK
Keeping
the radio small and
powerful
was
no
easy
task.
It
involved
new
technology
and
some pretty clever thinking.
For example, the
volume control
is
located
on
the
headphones
and
there
is no
on
/off
switch. Just plugging
in
the
headphone jack turns
on
the radio.
The
2
milliamp circuit gives
you
over
100
hours
of
play
from
your radio
-
all
from just one
comrronly
available silver oxide battery.
A
separate
battery runs your watch for over
a
year
But
the features don't stop there.
The AM radio tuner
is
attached
to
a
thin flat
disc that you
turn with
your thumb. Stations
come
in
clear
and crisp and
despite
the
tuner's
small
size, the
stations
are
easy
to
fine tune
thanks
to
a
highly
directional
Hitachi radio
an-
tenna which
has
a
low signal
-to-noise
ratio.
But
what about
the
watch?
of
both the
samarium cobalt headphones
and
the unique circuitry
is
one
of
the break-
throughs that
has
made this product possible.
With the lightweight headphones,
you also
get
a
small ear plug headphone which lets
you
monitor your
radio without drawing
too much
attention
to
it.
It's
really
a
cheap listening
device
that makes
a
perfect accessory
be-
cause
you can
easily carry
it
with you
in
your
pocket or
purse.
Now you can jog or play most
sports without
having
to
lug
a
cassette recorder
or AM
radio
But the most
fun
is
watching
the
reactions
of
people who
see you
listening
to
your digital
watch
or
seeing their
expressions after
they
hear
its
powerful sound
on
your headphones.
It's
a
product
that
people
will find hard to be-
lieve
-even
in
today's
electonic
revolution.
If
after your testing you're
not
convinced
that
the
Advance
Digital Watch Radio
is
even more
than we've described,
no
problem. Return
your watch
and
headphones
for
a
full
refund
including your
$3.00
for
postage
and
handling.
around. Just plug the long headphone wire
into your watch
and
select your entertainment.
At
sporting
events, while
walking
your dog,
GREAT VALUE PACKAGE
But with
all
its
advanced technology
and
sophisticated electronics,
the
Advance Digital
Watch Radio
is
probably
one
of the
greatest
values we've ever offered
in
one
complete
package.
A
digital watch,
a
built
-in
radio,
a
handsome
set of
samarium cobalt
head-
phones,
a
cheap ear plug headphone plus the
batteries -
all for
$49.95.
Each watch
comes
complete
with
a
one -year limited warranty
and
all
batteries.
Just open
up
your package,
plug
in
the headphones and you're ready
to go.,
The Watch Radio offers
us
the
opportunity
to
add some
fun and
everyday practicality
to
our
life all
at
a
very
reasonable
price.
Technology
keeps marching
on. So, we
wouldn't
be
surprised
if
the
Advance engi-
neers are working
on the TV
version
of
their
new watch.
And you
won't
be
too
surprised
either once
you
personally
hear the phen-
omenal sound from their
radio.
Order your
Digital Watch Radio
at no
obligation,
today.
To
order
send
a
check
or
money order
to the
address
below
or
credit
card holders call toll
-
free 800 228 -5000
(In
Nebraska
call 800 323-
6400). When ordering, please
use
order
num-
ber
(shown
in
parenthesis)
for faster service.
Please
add 3.00 for
postage
and
handling
and
Illinois residents
add 6% sales
tax.
Digital Watch Radio $49.95 (2040PE01)
Send
$1
for
the
new
JS &A
catalog
FULL -FUNCTION WATCH
The Watch Radio
is
a
full
-function
LCD
digi-
tal alarm,
chronograph timepiece
with
hourly
componentry.
The watch
is
an
impressive
pro-
duct
':hat
could alone
be
worth $49.95.
Now, when
you add the
powerful
AM
radio
and
a
set
of
samarium cobolt
high
fidelity
headphones, only
then can you
appreciate
the
real
value
of
the Watch Radio. Samarium
cobalt,
a
space -age material, reduces
the
weight
of the
headphones, provides outstand-
ing
frequency response
and
replaces
the need
for the bulkier
iron
magnet traditionally
used
in
today's smaller headphones.
The
combination
You
can easily change
the
battery after
100
hours
of
use
The
small opening
to
the
right of
the
dial
(shown
in
the
photo
at the
bottom)
is
a
sound port
for
the
watch chime and
alarm.
riding your bicycle
or
even waiting
in
line
at
the
checkout
counter, you've always
got your
entertainment
with you.
Think
of
it
Now to
check
the weather you can
use
your watch.
We suggest
you
order
an
Advance
Digital
Watch Radio
on
our
30
-day.
no
obligation
trial.
We
realize
that
it
is
impossible
for
you
to
ima-
gine
the incredible sound
and the watch
qual-
ity
until
you
personally wear
and use
it
So.
when you receive
it,
give
it
a
real
work
out. Use
it
while
you shop, work
or play.
Take
it
with you
on
a
trip. See how
handy
it
is
when
you
want
to
check
the weather
or
sports results.
o
PRODUCTS
THAT
THINK
Northbrook,
III
60062
One
JS &A Plaza,
(312)
564 -7000
©JSBA
Group.lnc.,1982
JUNE
1982
VOLUME 20, NUMBER
6
Introducing
the first
no-
crystal
hand
-held
scanner.
Popular
Feature
Articles
rouies
64
70
WORLD'S LARGEST- SELLING ELECTRONICS MAGAZINE
PROCESSING ANALOG SIGNALS
FOR
DIGITAL SYSTEMS/
Donald
K.
Pearson
Create interfaces between
"real world"
fast- changing signals and microcomputers.
LEARNING QUIZZES
FOR
ELECTRONICS
/Fredrick
W.
Hughes
Construction
Articles
THE WIDE
PRINTOUT
/Cass
A
and
Dan
Lewart
Transfer listings from
a
Pocket Computer
to the
TRS
-80
Model
NEW,
EFFECTIVE ANTI-BURGLARY
SYSTEM/
Raymond
L.
Kirby
System
sounds
an
alarm
before
a
burglar
enters
the home.
43
I.
49
55
ENHANCE TV SOUND WITH STEREO
/Joel
M.
Cohen
Synthesizer generates stereo from monophonic sources.
BUILD
A
TELEPHONE STATUS MONITOR
/Bradley
Albing
Turns on
indicator
lamps at extensions
when
a
phone
on the line
is
in
use.
LEVEL INDICATOR
FOR
BOAT
GAS
TANKS
/Jerry
J.
Hayes
Prevent overflow
with
simple
comparator
circuit.
60
62
Equipment Reviews
KENWOOD KVA
-502
AUDIO VIDEO CONTROL AMPLIFIER AND KV-901
VIDEO CASSETTE
RECORDER
SONY
MODEL
NR
-500
DOLBY
-C
NOISE REDUCTION PROCESSOR
24
OTRONA
"ATTACHE"
PORTABLE COMPUTER SYSTEM
A.W. SPERRY MODEL
EZ
-6110
PORTABLE DIGITAL MULTIMETER
30
33
40
15
Columns
The
Bearcat
100.
Now!
The one
scanner
you've
always
wanted
-a
no-
crystal,
fully
ENTERTAINMENT ELECTRONICS
/Len
Feldman
Test
Record for
Everyone.
COMPUTER
BITS/
Carl
Warren
New
Boards
Work
-and
Play
-Hard.
PROGRAMMER'S NOTEBOOK
/Jim
Keogh
Finally
-A
72
Fire That Gun!
COMPUTER SOURCES
/Leslie
Solomon
SOLID -STATE DEVELOPMENTS
74
76
81
synthesized hand
-held
scanner.
The incredible,
new Bearcat
100.
Push
button
controls
tune
in all
police calls,
fire calls,
weather
warnings, and emergency informa-
tion
broadcasts,
the split
second
they happen. Automatically.
16
channels for
storing frequen-
cies.
8
band
coverage-
including
high,
low
UHF
and
'T'
public
ser-
vice
bands; both the
70
cm
and
2
meter amateur
bands. Automatic
and manual search, lockout, scan
delay.
Direct channel access.
Flex-
ible
antenna, earphone,
AC
adapt-
er/battery charger
and carry
case
are
included.
Dial
800 -SCANNER
(800
-722-
5555
in
Indiana) for
your
nearest
Bearcat Scanner
dealer,
and
go
see
the world's
one and only hand-
held,
no-crystal scanner.
/Forrest
M.
Mims
Reflections
on the
Pocket
Calculator.
EXPERIMENTER'S
CORNER
/Forrest
M.
Mims
A
Single- Channel
Infrared Remote-Control
System.
PROJECT
OF THE
MONTH
/Forrest
M.
Mims
84
92
An Ultra- Simple
VMOS Timer.
Departments
EDITORIAL
/Art
Salsberg
Copping
Out.
LETTERS
NEW PRODUCTS
NEW LITERATURE
6
8
10
ELECTRONICS LIBRARY
OPERATION ASSIST
89
90
91
ADVERTISER'S
INDEX
PERSONAL ELECTRONICS NEWS
COVER PHOTO
DESIGN BY
STEVEN HUNT
100
112
DURCAl!
SCANNERS
Electra Company
Division
of
Masco Corp
of
Indiana
300 East
County Line
Road
Cumberland.
Ind lane 46229
International Business Office
Suite
102. 1828
Swift
North Kansas City,
Missouri
64116
c 1981
Masco Corp
of
Indiana
COPYRIGHT
°
1982 BY ZIFF -DAVIS PUBLISHING COMPANY. All
rights reserved. Popular Electronics
(ISSN
0032 -4486)
June
1982, Volume 20, Number
6.
Published monthly
by
Ziff-Davis Publishing
Co., at One Park Ave., New York. NY 10018. Richard
P.
Friese, President; Selwyn
Taubman, Treasurer, Bertram
A.
Abrams, Secretary. One
year subscription rate for
U.S. and
Posses-
2
CIRCLE
NO.
11
ON
FREE
INFORMATION
CARD
sions. $15.00; Cenada, $20.00;
all
other countries, $23.00 (cash orders
only,
payable
in
U.S.
currency). Second Class Postage
Paid at
New York, N.Y. 10018 and at
additional
mailing
offices. Authorized
as second
class
mall
by the Poet
Office
Dept., Ottawa,
Canada,
and
for payment of
postage
in
cash. POPULAR ELECTRONICS including ELECTRONICS WORLD, Trade Mark Regis-
tered. Indexed
in
the Reader's
Guide
to Periodical Literature.
Ziff -Davie also publishes Boating, Car and Driver, Cycle, Flying,
Popular Photography, Skiing,
Stereo
Review, Electronic Experimenter's Handbook,
and
Tape Recording
8 Buying Guide. POST-
MASTER: Send
address changes
to 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.
Parmisatons.
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 10018.
POPULAR
ELECTRONICS
A
video
cassette
mechanism
needs
to
be
more
than
a
package
for
your tape.
illi".**0
Your
video
cassette
mechanism
needs
to
do more
than
store
and
transport
your
video tape. Because
a
lot
can
go
wrong with your picture
that
has
nothing to
do
with your
tape.
Our specially engineered
cassette
mechanism maintains
proper tape tension, preventing
jamming
and snapped leaders
so
that
your tape
can
have
a longer
life.
We
also
designed
our
mech-
anism
for
optimal
tape
-to-head
contact
to
prevent
skewing and
©1982
TDK
Electronics Corp.
JUNE
1982
jitters.
And
we
use
stainless steel
pins
to
support the
guide rollers
which
provide
better
alignment
and
tape
-edge
protection
than
the plastic
pins used
by
some
manufacturers.
TDK maintains
tolerances up
to
21/2
times
tighter than industry
standards.
We
even build
our video
cassette
shell
halves
to
micron tolerances
for
an
exact top and bottom match.
We
do
everything
we
can to
make sure
that
TDK Super
Avilyn video
tape
and the TDK
super
precision
mechanism
will
combine
to
give you
the best
possible
picture.
That's
why our
video
cassette
mechanism
is
every
bit
as
impressive
as our
video tape.
44TDK®
The vision
of
the future.
CIRCLE
NO.
46
ON
FREE
INFORMATION CARD
3

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