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wireless remote control doorbell circuit

2016-11-25 03:30  
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wireless remote control doorbell circuit
In the figure, these A、B inverter of hex inverter 406 and crystal X1 form a 32.768kHz signal generator, then inverters C, D, E, F are in parallel to modulate high frequency signal generator which is with Q1 as the core, then the generator outputs high frequency modulated wave, Q1 etc elements in figure 2 form a super regeneration receiving circuit, the circuit receives high frequency signal sent from emitter and modulates it to a 32.768kHz signal. The signal is amplified and shaped through C4, R3 and inverter A, B, C, then is filtered via crystal X1, Q2 trigger ding-dong music film to send out doorbell “ding-hu”.