Electronic Pest Repeller (2)

Published:2011/5/19 3:09:00 Author:Sue | Keyword: Electronic, Pest Repeller | From:SeekIC

IC2 is a COMS decimal counter integrated circuit. It has 10 decoding output terminals(Y0-Y9). When it is working, its output terminals will output high level in turn. VD1-VD10 and R4-R13 will control IC3, generating 10 continuous frequency signals. The audio output circuit consists of V and BL. IC3's 3 pin will output ultrasonic wave signal, which will emit ultrasonic wave through BL. When the power is on, if BL can output audio signals with frequency that will change in every minute, then the circuit is working well.



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