PT2262 universal infrared remote control 40HZ carrier signal generation circuit

Universal infrared remote control circuit 40KHz carrier signal generation circuit PT2262 is used as an infrared transmitter circuit. When any one or several of S1~S4 are pressed, PT2262 is powered on and starts to output a pulse data stream. At the same time, the pulse oscillator composed of CD4011: CD4011: B also starts to oscillate. The oscillation frequency can be accurately adjusted to 40KHz by the 22Ω potentiometer. This frequency is the infrared carrier frequency. The pulse data stream output by PT2262 is modulated on the 40KHz carrier wave in CD4011:D, and then the infrared light-emitting diode is driven by the triode to emit an infrared light signal.