Remote control doorbell circuit diagram

Published:2011/9/5 3:31:00 Author:Lucas | Keyword: Remote control doorbell | From:SeekIC

The self-excited multivibrator is composed of the discrete components, and the oscillation frequency is mainly decided by L2, C3. The transmitting frequency is 30 ~ 40MHz gotten by the components shown as the figure. Usually, the circuit is disconnected, pressing the AN will make power on, and the circuit will emit oscillation signal. Receiver circuit: D1, D2 form the doubler circuit, which can double and rectify the signal sensed by L4, and the output signal can make BG3 saturated conduction, then the conduction will generate the negative pulse to set the time base circuit 555, and its pin 3 outputs high level to trigger the music integrated circuit IC2. BG4 is used as audio power amplifier. R3, C9 can adjust the delay time of 555.



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