Use the TV remote control to turn off the power supply of electrical appliances circuit diagram

When the infrared receiving tube PH302 receives the signal from the remote control, it outputs a low-frequency signal through the CX20106A frequency selection amplifier. This low-level signal charges C through D and R, causing the voltage at the negative terminal of C to gradually decrease. When the potential of the negative terminal of C drops below 1/3Vcc, the discharge tube of the 555 circuit is cut off, the relay is released due to electric shock, and the power supply is cut off. The RC in the circuit can set the action sensitivity. Generally, press the remote control for 3 to 5 seconds. When the power is turned on, pressing the S1 circuit will cause the relay to self-lock.