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Wireless two-tone electronic doorbell circuit diagram

2016-11-20 19:37  
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Wireless two-tone electronic doorbell circuit diagram
Transmitter: Pressing the SB will make the transmitter circuit work. D1, D2 and R2, R3, C4 constitute a low-frequency oscillator to control the audio oscillator composed of the D3, D4 and D5, D6, then it works alternately. The generated audio signal is added to modulation side of Rf signal oscillator by C7. Then high-frequency oscillator signal is sent to air after modulation. Receiver circuit: frequency-modulated wavesensed by the antenna is demodulated by A2, then its pin 14 outputs two-tone doorbell signal, which is coupled to the input of A3 by R7, C26, while the pin 9 outputs low so that switch V2 is conduction, then A3 gets power and works.