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48783
BUILD THIS AUDIO
EXPANDER
EirRadin
Er
conics®
Combined with
NOW
SNt+Z
tsOZZ68
tiLiVMOOt
S1"IonOLt
G
Electronics
BUILD THIS
ULTRASONIC CLEANER
Put
it
to
work scrubbing
circuit
boards,
connectors,
and
even
coins
and
jewelry!
FIELD-EFFECT
TRANSISTORS
FET
principles,
terminology,
and
circuits
FORCE-SENSING
RESISTORS
LOn909Z0d
Slf1o1 '1S
Mol1VM
QAL
TIME
UP
Learn
how
to
put
them
DOWN
OFF
to work!
CAPACITORS
What
they
are,
how
they're
made, and
how
they're
used
03
$3.50
U.S.
$3.95
CAN
o
Plus:
T
GERNSA
BACK
PUBLICATION
0912
i
*
Hardware Hacker
*
Audio
Update
*
Video
News
*
And
Lots
More!
48783
o
www.americanradiohistory.com
www.americanradiohistory.com
Multi-Choice.
Whether you're doing first-level troubleshooting or component -level diagnosis, Fluke meters offer
you one of
the widest choice
of
capabilities
and price ranges
in
the industry. Choices ranging from
the basic Fluke
12
with auto function
V-
Chek'"
and
Continuity
Capture.
Io
the classic Fluke
77
Fluke
77
The
classic
with Auto Touch
Hold
"
and
current measurements.
Multimeter
$169.00
To the
advanced
Fluke
83 with Min
/Max /Average recording,
Frequency,
Duty
Cycle and
Input
Alert
-.
Plus
a
full
line of
quality accessories
to
extend those
capabilities
even
further.
No
matter which Fluke
meter
you
choose,
you can
count
on
precise, reliable, consistent performance year
in
and
year
out.
Ilus,
strong
customer support
and
product warranties that measure
up to
any
in
the industry.
Make the
choice
FLUKE
12
FLUKE
77
FLUKE
83
The Fluke
meters listed above feature DC'AC voltage, resistance,
audible continuity and diode
test.
Capacitance
measurements
Auto Touch Hold®
Current measuremems
Analog/Digital display
Three-year warranty
Fluke
83
Auto Touch
Hold
®and
Relative modes
Current measurements
Analog /Digital display
Three -year warranty
Full-featured
Multimeter
S255.00
that gives
you
the most choices.
V
Chek'"
(auto function)
Min /Max Record with
Relative Time Stamp
Two -year warranty
look
to Fluke
Continuity
Capture'
Yellow holster with Flex
Yellow holster
with Flex
Stand'.
Basic accuracy 0.9%
Basic accuracy 0.3%
Stand'"
Input
eeo'
Capacitance
measurements
Frequency
and Duty
for the
tools you need
to
get the
job done
right.
Cycle
MlsMax/Avg.
Recording
Basic Accuracy
03%
See your Fluke distributor,
or call
1-
800 -87
-FLUKE
John Fluke
Mfg. Co., Inc.
P.
0.
Box 9090, Everett,
WA 98206
For more
information call,
(416) 890 -7600 from
Canada
ti
for
a
catalog
and the name of the
Fluke
12
Auto
-function
(206) 356-5500 from other countries
Multimeter
$89.95
©Copyright
1992 John Fluke Mfg. Co. Inc. All
rights reserved.
Prices subject
to
change. Suggested
U.S list price.
Ad No.
00276
distributor nearest
you.
CIRCLE
FLUKE.
121
ON
FREE INFORMATION CARD
r
March
1993
ON
THE
COVER
..1I_
NM
OMER
o,,,.
Vol.
64
No.
3
Electronici
EÌ
NOW
actriimcs,
g
IOU
Ills
wRMIUC OMEN
Put
it
to work
scritbt
circuit boards.
connective, and
even coins
andjeweiyt
1)8!^I
'b9y.
a:noa.
.m
Learn
Put
Mon
to
work
WET,
tr.
t
Mal
they
are
bort Meer*
made, end
oboe
nome
Delicate jewelry
can
be
hard
enough
to clean.
It's
difficult
to
reach all
the nooks
and
crannies
using
ordinary cleansers
and
cloths,
and
scrubbing with
harsh
abrasives can cause damage to
fragile
items.
The same
problems
can
be
even
worse when
trying
to
clean
tools, connectors,
and
parts.
Ultrasonic
cleaning
has
been
a
common
solution
in
com-
mercial
and
industrial
applica-
tions,
butfactory
-made
ultrasonic
cleaners
are
beyond the
budgets
for
small companies
and
hob-
byists.
Now
you can
build your
own
ultrasonic
cleaner.
It
uses
non
-toxic,
non
-flammable clean-
ing
solutions
-and
a
bubbling
ac-
tion
created
by
piezoelectric
transducers
-to
get your jewelry,
car
and
bicycle
parts, card -edge
connectors,
circuit
boards,
tools
and
coins spic
and span.
Turn
to
page 33
for
all
the
details
on
this
professional -quality project.
ir.
urn
OM
ya,
Tow drey
n.w.
rae
bow
yom
mnrey
tnerP
more
cost
,y
a,. dors
BUILD
THIS
Nhr.tivxl,
Fro
your
c;rruits
S,
AUDIO
EXPANDER
FORCE-
SENSING
RESISTORS
CAPACITORS
/l
)"a
urea
.r
w
w
A
..ntl.w
:
or
re
1.
Errhance shvum and moon suex,,
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under
430,
with
oar
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nndio
processor,
I*
wet
w
www
to=
PAGE
57
PAGE
71
PAGE
65
As
a
service to readers, ELECTRONICS NOW 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. ELECTRONICS
NOW disclaims any
responsibility for
the
safe
and
proper
functioning
of reader
-built projects
based upon
o
-
from plans or
information published
in
this
magazine.
Since some of the
equipment
and
circuitry
described
in
ELECTRONICS NOW may relate to or
be
covered by U.S. patents, ELECTRONICS
NOW disclaims
any
liability for
the infringement
of such patents
by the making, using, or
selling
of
any
such equipment or circuitry,
and
suggests that anyone interested
in
such
projects consult
a
patent
attorney.
ELECTRONICS
NOW, (ISSN 0033 -7862)
March
1993.
Published monthly by Gemsback Publications. Inc., 500
-B Bi
-County Boulevard, Farmingdale,
NY
11735.
Second -Class Postage paid
at Farmingdale,
NY and
additional mailing offices. Second -Class
mail
registration
No. R125166280,
authorized
at Toronto, Canada. One -year
subscription
rate U.S.A.
and
possessions
$19.97, Canada
$27.79 (includes
G.S.T.
Canadian Goods
and
Services
Tax
Registration
No. R125166280), all
other countries $28.97. All subscription
orders payable
in
U.S.A.
funds
only.
via
international postal
money
order
or
check drawn
on
a
U.S.A. bank.
Single copies $3.50.
is 1993 by
Gernsback Publications,
Inc.
All
rights reserved. Printed
in
U.S.A.
POSTMASTER: Please send address changes to ELECTRONICS NOW,
Subscription Dept.,
Box 55115,
Boulder, CO
80321 -5115.
A stamped self -addressed envelope must accompany
all
submitted manuscripts
and
/or
artwork or photographs
if
their
return
is
desired should they
be
rejected.
We
disclaim
any
responsibility for
the loss or damage of
manuscrips
and
/or
artwork or photographs while
in
our possession or otherwise.
PLEASE TUR
PAGE
FOR
COMPLETE
CONTENTS
1
Electronics
33 ULTRASONIC CLEANER
Keep
components, tools,
and
gadgets shiny clean!
Hugo
Gemsback
(1884 -1967)
founder
Larry Steckler,
EHF, CET,
Reinhard Metz
69
TIME -DELAY RELAY
Turn
off your appliances
automatically
and
stop wasting
power!
editor
-in
-chief
and
publisher
EDITORIAL DEPARTMENT
Brian
C.
Fenton,
editor
James
Melton
71
AUDIO
EXPANDER
This inexpensive, one
-chip device enhances stereo
and
mono audio.
Marc Spiwak,
associate editor
Neil
Sclater,
associate
editor
Teri Scaduto,
assistant editor
Jeffrey
K.
Holtzman
computer editor
Phill
Hausman
83
REMOTE
-CONTROL
TESTER
Make sure
your
remotes
are
working
properly.
Robert Grossblatt,
circuits editor
Larry Klein,
audio editor
David
Lachenbruch
contributing editor
Don
Lancaster
contributing editor
A.
E.
Plavcan
Kathy
Terenzi,
editorial assistant
ART DEPARTMENT
Andre
Duzant,
art director
Injae
Lee.
illustrator
Russell
C.
Truelson,
illustrator
CHTITEI[114
47
FIELD
-EFFECT
TRANSISTORS
Put JFET's, MOSFET's, and
the rest to
work
in
your designs.
l'
Ray
Marston
PRODUCTION DEPARTMENT
Ruby
M.
Yee,
production director
Karen
S.
Brown
advertising production
57
CAPACITORS
Learn how
they're
made and how
to apply them
cost -effectively.
Marcella Amoroso
production assistant
Ray
Marston
Lisa
Rachowitz
editorial production
65
FORCE
-SENSING RESISTORS
All about the
"ultimate
switch technology."
T. L.
Petruzzelis
CIRCULATION DEPARTMENT
Jacqueline
P.
Cheeseboro
circulation director
Wendy
Alanko
circulation analyst
Theresa Lombardo
circulation assistant
Michele
Torrillo
reprint bookstore
6
VIDEO
NEWS
What's
new
in
this fast
-
changing field.
85
AUDIO
UPDATE
The
Audio
Answerman returns.
Larry
Klein
87
DRAWING BOARD
Our descrambler
is
almost
finished.
Typography
by
Mates Graphics
Cover photo
by
Diversified
Photo
Services.
David
Lachenbruch
18
EQUIPMENT
REPORT
B
+K
Precision Model
1686
Power Supply.
Electronics
Now
is
indexed
in
Applied
Science 8 Technology
Index,
and Readers
Guide to Periodical Liter-
Robert
Grossblatt
90
COMPUTER
CONNECTIONS
The
emerging
PC.
ature, Academic
Abstracts,
and
Magazine
Article
Summaries.
75 HARDWARE HACKER
Nichrome, resistance wire,
and more.
Microfilm
&
Microfiche editions
are
available.
Contact circulation depart-
ment for details.
Don
Lancaster
Jeff
Holtzman
Advertising
Sales
Offices listed
on
page
102.
Electronics Now
Executive and
Administrative Offices
1-516-293-3000.
Subscriber Customer
Service:
1-800-288-0652.
98
Advertising
Sales
16
Letters
Order
Entry
for
New
Subscribers:
Offices
98
Advertising
Index
2
1-800-999-7139.
22 New
Lit
24 New
Products
12
Q&A
4
What's News
93
Buyer's Mart
Audit
Bureau
of
Circulations
Member
Within
budget.
Without
compromise.
The
value
of
this
100
MHz
scope is easy
to
see.
The HP
54600
gives you
superior
viewing
of virtually
any wave-
form, even
at
low
rep rates and
slow sweep speeds.
It
looks and
feels like an analog scope, with
dedicated knobs and
a display
that responds
instantly to your
control changes.
And it
has the
digital
power
that
analog
can't
high
accuracy, auto-
give
you
matic measurements, hard copy
output
and programmability.
But
what really
stands
out
is
that
all
this performance
costs
just
$2,895
(4-
channel)
or $2,495
-
(2-
channel).*
What's more, now
through
April
30, 1993,
you
can
add
FF
1'
by
purchasing an
HP
54657A
or
54658A
Measurement/
Storage
Module
for
only
$375.
For
more
information,
call
HP DIRECT
at
1-
800
-452-
4844* ext.
TB28.
We'll
be happy to
send
you
literature or
let you talk
to
an
HP engineer.
u.s.
list price
"In
Canada
call 1-800-
387
-3154,
Dept.
435
FFT is
just
one
of
the
advanced
wave
-
form
viewing
tools
you'll
get
with
the
HP
54657A/58A
Measurement
Storage
Module.
There
is
a
better
way.
,,I9
N2
Hewlett -Packard
Co.
TMCOLI39/RE
CP]h
HEWLETT
PACKARD
CIRCLE
176
ON FREE
INFORMATION CARO
www.americanradiohistory.com
www.americanradiohistory.com

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