Class Bell Automatic Controller Circuit Composed of 555

Published:2011/6/2 3:14:00 Author:Joyce | Keyword: Class Bell , Automatic , Controller, 555 | From:SeekIC

As shown in the figure is a class bell automatic controller circuit. It includes a step-down rectifier circuit, a circular program timing circuit, and an executive control circuit etc. IC4~ IC1 are trigger delay circuit, and the delay time can be adjusted by regulating charge-discharge time RC. IC5 is ringing time timing control circuit, and the delay time td5 is 1.1 R13C12. The output of IC4 IC1 in the circular program timing circuit is sent to D1, D2, then goes through capacitor C11 to trigger IC5 to output high level (feet③),which would make the relay actuate, thus supply the bell DLwith power.



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