Electronic Mouse Exterminator (2)

Published:2011/5/17 5:22:00 Author:Sue | Keyword: Electronic, Mouse Exterminator | From:SeekIC

When S is connected, IC1’s 2 pin and 6 pin have low level, and its 3 pin outputs high level, making IC2 begin to output meow electronic signal, which can drive BL to make a loud “meow”. At the same time, C1’s voltage becomes higher and higher. When IC1’s 2 pin and 6 pin have a voltage higher than 2Vcc/3, IC1’s 3 pin’s high level turns into low level, and BL stops the sound. Then C1’s voltage becomes lower and lower. When the voltage reduces to Vcc/3, IC1’s 3 pin has a high level, driving BL to make a “meow” sound.



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