发射电路是以555为核心组成多谐振荡器，通过改变振荡器的工作频率来调节红外发射器件的工作频率，且可以通过调节电阻来减小红外信号的占空比，从而尽可能地增加红外防护的范围。-Transmitter is composed of 555 core multivibrator, by changing the oscillator frequency to adjust the frequency of infrared emitter, and can adjust the resistance to