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Ultrasonic Insect Killer

2014-11-27 19:07  
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Ultrasonic Insect Killer
This is a very simple ultrasonic mosquito, insects, cockroaches repellercircuit.The circuit is a relaxation oscillation circuit which iscomposed of the CMOS 4047 monoflop, adjusting 4K7 can makeits center frequencybe approximately 22KHz, four transistors form bridge power output to promote the 3.25 inch Piezo and emit ultrasonic signals.