Sound-activated infrared remote control switch circuit diagram

The infrared remote control switch generator circuit using the sound control circuit BH-SK-I is shown in the figure below. The generator is a multivibrator composed of 555. The generated pulse drives the infrared pulse signal through the external emitting diode. The receiving tube is paired with the transmitting tube, which turns the infrared light pulse into an electrical signal, which is pre-amplified by BG1 and triggers the IC 2 voice-activated integrated circuit BH-SK-I. After being triggered, its 12-pin outputs a high level, causing the BG2 conduction relay to close the socket CZ and get electricity. If it is shut down, you only need to press the button AN of the generator . The internal trigger of IC 2 will flip, output low level, BG2 will be cut off, the relay will be released, and the socket will lose power.