Dual-channel radio AC remote control switch circuit diagram

As shown in the figure is a dual- channel radio AC remote control switch circuit. Transmitter: Q3 generates a high frequency carrier signal. Q1 and Q2 form an oscillation circuit. When SW1 is pressed, the oscillation frequency is 5kHz, and when SW2 is pressed, the oscillation frequency is 3.7kHz. When the circuit starts to vibrate, the LED serves as a work indicator.

Receiving circuit: Q4 and peripheral components form a receiving circuit, which demodulates two audio signals, preamplifies them in Q5, and then sends them to pin 3 of IC 1 and IC2. The demodulation frequency of IC1 is 5kHz, which corresponds to SW1 of the transmitter, and IC2 corresponds to SW2. When SW1 is pressed, pin 8 of IC1 sends a switching pulse. When SW2 is pressed, pin 8 of IC2 also sends a switching pulse. Both pulses are sent to STA401A. STA401A and peripheral components form two independent bistable circuits. The pulse sent by IC 1 makes pin 4 of STA401A change to low potential, and the input end of TLP3503 (photocoupler circuit) has current flowing through the load to power the work. STA401A another control relay. Press the corresponding button again to reset the corresponding circuit of STA401A.
ck="window.open(this.src)" alt="Click to see larger image"/>