Each house cockroaches are unwelcome. their presence, of course, is not conducive to comfortable living. Luckily, thanks to my experience in radio and Hostel accommodation, accumulated experience in fighting these enemies by means of ultrasonic generators. Suffice it for several hours a day periodically include ultrasonic repeller in apartment, to unwanted guests had left her forever. Here I want to share a simple diagram of the ultrasonic repeller cockroaches and not only.
Consider the schematic diagram of a powerful high-frequency generator. Frequency generating means is adjustable over a wide range via the resistor R1.The basis for insect repellent device circuit is imported integrated circuit CD4047, which contains elements and trigger the multivibrator, forming symmetric and antiphase signals on outputs. These terminals connect the audio source. As the sound source is used piezoceramic transducer (squeaker by phone or sensors).
pulse generating frequency depends on the parameters of the circuit C2-R1-R2.
The printed circuit board unit turns compact enough even for elements in the DIP-packages.
By using this structure, responses could be argued that the device effectively not only in repelling roaches, but mosquitoes, midges, home red ants. I.e, considered repeller insects have universal. of course, that for each of the pest has its own daunting ultrasonic frequency range, which should be selected experimentally variable resistor R1.
PCB in lay format:
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