Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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Ultrasonic pest repeller circuit is powered by a 9-volt battery. Est. cost: $9 (kit).
ELECTRONICS HOBBYISTS HANDBOOK 1991 pg. 69

Bug-Off. Electronic pest repeller circuit sends out ultrasonic pressure waves (at 22-65 kHz) that are an annoyance to insects. Powered by two 9-volt batteries.
ELECTRONICS HOBBYISTS HANDBOOK 1992 pg. 60

Solar-powered fly controller. Build a high-voltage electric grid for electrocuting flying insects. Powered by either battery or solar cell.
POPTRONIX EXPERIMENTER HANDBOOK Summer 1997 pg. 87

Bug-Off. Build an electronic pest repeller which sends out ultrasonic pressure waves (at 22-65 kHz) that are an annoyance to insects and some small animals.
POPULAR ELECTRONICS [2] Apr 1991 (v.8#4) pg. 36
Added Info POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 3

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

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