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PROXIMITY SWITCH entries in Index to How To Do It Information
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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.

PROXIMITY SWITCH
xx   SWITCH -- ELECTRONIC

Circuits for a (1) proximity detector and (2) light sensor incorporate a light-to-voltage converter chip.
CQ. THE RADIO AMATEUR'S JOURNAL Sep 1993 (v.49#9) pg. 86

Ultrasonic burglar alarm can also be used as a proximity detector or a fire alarm. Works up to 20 feet.
ELECTRONICS ILLUSTRATED Jan 1969 (v.12#1) pg. 85

Flashing red light controlled by a proximity switch warns people not to open a door.
ELEMENTARY ELECTRONICS Jul-Aug 1969 (v.8#3) pg. 65

Easy-to-build proximity sensor adds to the detection ability of your existing burglar alarm. Use with any system that uses a normally closed sensor circuit. Protects any metal object that can be isolated from earth ground.
ELEMENTARY ELECTRONICS Nov-Dec 1974 (v.14#6) pg. 77

Circuit for a sensitive proximity-alarm incorporates a 4049 CMOS hex inverting buffer.
HANDS-ON ELECTRONICS Nov 1986 (v.3#6) pg. 92

Proximity detector circuits turn switches on and off whenever a person comes within their electric field.
HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 40

Proximity alarm circuit is used as part of a counter to monitor the number of people using a door.
HANDS-ON ELECTRONICS Mar 1987 (v.4#3) pg. 26

Diagram of a simple transistorized capacitance relay that can be operated by bringing a person's hand close to a plate.
POPULAR ELECTRONICS [1] Mar 1968 (v.28#3) pg. 77

Proximity relay detects movement up to 3 ft. away. Est. cost: $19.
POPULAR ELECTRONICS [1] Jun 1968 (v.28#6) pg. 27

Proximity switch circuit utilizes a power hexFET. Sensitivity can be varied.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 85

Proximity switch circuit is triggered by a reflected infrared (IR) signal. Includes an optocoupler-based Triac-driver circuit which can be added to control a small AC motor.
POPULAR ELECTRONICS [2] Nov 1990 (v.7#11) pg. 75

Proximity detector circuit incorporates a 567 tone decoder.
POPULAR ELECTRONICS [2] May 1991 (v.8#5) pg. 74

Using a single special-purpose IC (the ULN2429A fluid detector) in as many applications as possible. (1) Low-level liquid level detector. (2) High-level liquid level detector. (3) Touch-activated switch. (4) Proximity sensor. (5) Ultrasonic pest repeller. (6) Variable square-wave generator. (7) Code-practice oscillator. (8) Alarm circuit. (9) Light beam circuit (LED-emitter / phototransistor-sensor circuit).
POPULAR ELECTRONICS [2] Jun 1994 (v.11#6) pg. 76

More ultrasonic circuits. (1) CW (Morse code) transmitter. (2) Motion detector. (3) Proximity detector.
POPULAR ELECTRONICS [2] Jan 1995 (v.12#1) pg. 71
Correction POPULAR ELECTRONICS [2] Apr 1995 (v.12#4) pg. 4

Proximity switch controls AC circuit whenever a hand (or other part of your body) is passed near an insulated touchplate.
RADIO-ELECTRONICS May 1984 (v.55#5) pg. 38
Correction RADIO-ELECTRONICS Jul 1984 (v.55#7) pg. 14

TRIAC capacitance switch will turn off a lamp or other load when an external body comes near an insulated metal plate. Est. cost: $20.
RADIO-TV EXPERIMENTER #814 Dec 1966-Jan 1967 (v.21#3) pg. 49