Wireless remote control doorbell circuit diagram

In the figure, the two inverters A and B in the six-inverter 406 and the crystal X1 form a 32.768kHZ signal generator, and then the inverters C, D, E, and F are driven in parallel to modulate with Q1 as the core The high-frequency signal generator outputs high-frequency amplitude modulated waves. Q1 and other components in Figure 2 constitute a super-regenerative receiving circuit, which receives the high-frequency signal from the transmitter and demodulates the 32.768kHZ signal. Coupled through C4 and R3 and amplified and shaped by inverters A, B and C, and then filtered by crystal It is about 40 meters.