ultrasonic repeling mosquito device

Published:2011/5/16 9:38:00 Author:Christina | Keyword: ultrasonic, repeling mosquito | From:SeekIC

The ultrasonic ultrasonic repeling mosquito device This is one kind of extremely simple ultrasonic repeling midge, bug, cockroach circuit. This relaxation oscillation circuit is composed of the CMOS 4047 monostable trigger, you can make it's center frequency to 22KHz by adjusting the 4K7, then the signal is output by the bridge type power which is composed of four transistors to promote the 3.25 inch Piezo to send out ultrasonic signal.



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