Notes:
Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by krishna kumar the circuitry consists of a phase locked loop (CMOS 4047) 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.
The piezo used was a standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K. These are rated +/-3dB to 28kHz.
Jun 29, 2007
Insect Repellant
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1 comment:
Dear Mr Krishna Kumar
Hello
I viewed your Insect repellant circuit, It seems very good but Piezo problem is there.
So, Please tell me where to find the piezo --- standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K.
What is the price ?
Thanking You
Kishore K
Ranchi
Jharkhand
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