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Kaixin micro test ESD18VB03-0201

IC1 and R10, RP1, and C4 form an astable multivibrator with an oscillation frequency of approximately 40 kHz. It drives the infrared light-emitting diode D5 and emits infrared light with a carrier of 40 kHz. Infrared receiving adopts the receiving tube D6 for use with D5. IC3 is the special integrated block CX20106 for infrared receiving amplification. Its center frequency f0 depends on C1, R14. When f0 is the same as the 40 Hz emitted, IC7's 7 feet are low. Level, VT2 cutoff, SCR1 is not conducting, and the xenon lamp NH is not lit.