Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

Portable proximity alarm senses human touch and sets off a piercing sound as soon as someone grasps the object under protection (such as a doorknob). Est. cost: $14 (kit).
ELECTRONICS HOBBYISTS HANDBOOK 1991 pg. 85

Tipoff intruder alarm. Hangs on inside doorknob and goes off of someone touches the outside knob.
ELECTRONICS ILLUSTRATED Nov 1969 (v.12#6) pg. 69

Panoply. A portable, battery-powered intrusion alarm hangs on the inside doorknob of the room to be protected. It emits an audible alarm if anyone touches the outside doorknob. Est. cost: $30.
HANDS-ON ELECTRONICS Fall 1984 (v.2#2) pg. 54

Rip-off retarder alarm. Super-sensitive capactive sensor alarm will signal whenever a human touches or approaches the sensor lead. Ideal for use as a perimeter alarm, door alarm, to protect metal objects, etc.
HANDS-ON ELECTRONICS Jul 1987 (v.4#7) pg. 46
Added Info HANDS-ON ELECTRONICS May 1988 (v.5#5) pg. 6

Personal intrusion detector. Lets you know when someone has gone through your important business or personal belongings without authorization. A tell-tale LED will flash whenever this "paperweight" is lifted or moved.
MODERN ELECTRONICS [2] Jan 1989 (v.6#1) pg. 52
Added Info MODERN ELECTRONICS [2] Mar 1989 (v.6#3) pg. 7

Low-cost touch alarm can detect a doorknob, screen or other small metal object being touched.
POPULAR ELECTRONICS [1] Feb 1969 (v.30#2) pg. 92

Two electronic systems to protect you and your property that you can build. (1) An infrared intrusion alarm will protect up to 50 feet between transmitter and receiver. Has a built in circuit to avoid being fooled by other IR sources. (2) A portable battery-powered alarm is triggered whenever someone touches a doorknob. The alarm simply hangs on the inside doorknob.
POPULAR ELECTRONICS [1] Dec 1978 (v.14#6) pg. 66
Correction POPULAR ELECTRONICS [1] Jan 1979 (v.15#1) pg. 8

Tamper-alarm circuit turns on an LED if something is moved.
POPULAR ELECTRONICS [2] Sep 1995 (v.12#9) pg. 74

A five-way radio breadboard includes a wireless mike, touch alarm, code transmitter, phono oscillator, and AM receiver.
POPULAR MECHANICS Apr 1965 (v.123#4) pg. 196

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