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Insect Repellent(BC327)

2017-08-10 22:18  
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This article briefly describes the Insect Repellent (BC327). Although this circuit is very easy to understand, but also very practical. Circuit elements in depth understanding of the grasp of the principle is very effective. Do you know the circuit, you can see and purchase these components: BC327 .

Repel those repugnant insects from your garden this summer with this insect repellent circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS4047) wired as a 22KHz oscillator. The output is amplified by a pair of complimentary output transistors and drives a Motorola 3.25 inch Piezo. Current drain is around 120mA so an external power supply is recommended.

Circuit diagram:

Figure:1

Figure 1 

The piezo used was a standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K. These are rated /-3dB to 28kHz.

 

 


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