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A very simple ultrasonic mosquito, insect and cockroach repellent circuit
Source: InternetPublisher:newlandmark Updated: 2014/06/16
Relevant key device information applied in this article:
4047
BC327
BC337
circuit consists of a CMOS 4047 monostable trigger to form a relaxation oscillation circuit. By adjusting 4K7, its center frequency is about 22KHz, and then a bridge composed of 4 transistors The power output drives the 3.25 inch Piezo to emit ultrasonic signals.
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