Simple ultrasonic mosquito repellent circuit diagram

This is a very simple ultrasonic mosquito repellent, insects, and cockroach circuits.

The circuit consists of a relaxation oscillating circuit by the CMOS 4047 single -stable -state trigger. Through 4K7, its central frequency is about 22khz, and the bridge power output composed of 4 crystal tubes is output to push the ultrasonic signal 3.25 INCH PIEｚO.

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