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 ai..

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