
April 1989
Radio
Electronics
Vol. 60
No. 4
BUILD
THIS
47
WIRELESS
SECURITY SYSTEM
Our easy -to
-build system combines infrared
and
RF technologies.
Dan Becker
53
ALPHA/THETA
MEDITATION
GOGGLES
Photic
stimulation -a
simple
relaxation technique.
Mark
Worley
59 DIGITAL
PEAK -DETECTOR
Display
and
hold
the maximum
output
level from
any
transducer.
Roger
D.
Secura
74 MACROWAVE
OVEN
A special April project.
Laurence Hakemachi
33
HIGH
-TECH
SECURITY SYSTEMS
An in -depth look
at
what's
available in home security
today.
Herb Friedman
42 INSTALL
YOUR
OWN
BURGLAR ALARM
Step -by -step
guide
to wired-
and
wireless-
system
installations.
Herb Friedman
and Brian C. Fenton
r
. _
iTHw
63 WORKING
WITH
COUNTERS
Recipes for more than 20
practical counter circuits.
Ray Marston
6 VIDEO NEWS
What's new in this fast -
changing field.
David Lachenbruch
17
EQUIPMENT REPORTS
Sencore LC 102
Capacitance/
Inductance
Meter.
25
HARDWARE HACKER
Refilling SX toner cartridges.
Don Lancaster
70 AUDIO UPDATE
The importance of amplifier
output current.
Larry
Klein
72
SHORTWAVE
RADIO
The
International Frequency
Coordinating
Committee.
Stanley
Leinwoll
COMPUT ENDIGEST
D
.0 mow
r«b171
EDITORS
WORN
BENCH
o
PAGE 77
PAGE 53
AND MORE
104 Advertising
and Sales
Offices
104 Advertising Index
8 Ask R -E
105 Free Information Card
14 Letters
87 Market
Center
22 New Products
69 PC
Service
4 What's News
1
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