Ultrasonic mosquito worm repellant circuit

Published:2011/4/23 1:56:00 Author:May | Keyword: Ultrasonic, mosquito worm repellant | From:SeekIC

Ultrasonic mosquito worm repellant circuit It is a very simple ultrasonic mosquito, worm, cockroach repellant circuit. The circuit is relaxation oscillator consits of CMOS 4047 single shot trigger. It can make its center frequency at about 22kHz by adjusting 4k7. Then it can output by bridge type power tube composed of four transistors. And it can push 3.25 inch Piezo to generate ultrasonic signal.



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