Electronic Mouse Exterminator (4)

Published:2011/5/17 5:38:00 Author:Sue | Keyword: Electronic, Mouse Exterminator | From:SeekIC

When S is connected, IC1’s 3 pin outputs high level, making the circuit begin to work. IC2’s 15 pin will output “meow” signal, which can drive BL to make a loud “meow” sound. Then V will work intermittently with the change of “meow” sound, and the bulbs will keep twinkling. Then when IC1’s 6 pin’s voltage becomes higher than 2Vcc/3, IC1’s inside circuit reverses, making 3 pin have a low voltage, and K1 is released, which will stop the circuit. Then IC1’s 2 pin and 6 pin will have a lower voltage. When the voltage is lower than Vcc/3, K1 will be connected, and the circuit begins to work again.



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