Multifunctional Music Doorbell Circuit

Published:2011/7/8 1:30:00 Author:Joyce | Keyword: Multifunctional, Music Doorbell | From:SeekIC

Multifunctional music doorbell has three functions.First, it can set a password; second, it has the function of avoiding disturbance; thirdly, it can inform whether the host is in. The circuit is as shown in the figure. It constitutes of a password setting circuit, control switch and doorbell music circuit. IC1,IC2 is CD4017; IC3a is one flip-flop of the double D flip-flop CD4013. It composes a monostable trigger with R8, C4 .



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