High performance infrared remote control switch circuit a

Shown is a high-performance infrared remote control switch circuit , which consists of a transmitting circuit diagram (a) and a receiving circuit diagram (b).
    The transmitting circuit (a) shown is mainly composed of NE555 and infrared transmitter. NE555, RJ, RP1, and cl form an abbreviated oscillator
with an oscillation frequency of about 35 kHz.
    The receiving circuit (b) shown includes an infrared receiver, preamplifier, detector and amplifier, bistable circuit and thyristor control
circuit. etc. composed.
    In the circuit, the infrared transmitter and infrared receiver should be installed together. IC 1 is a dedicated infrared signal amplification integrated circuit KA2181,
which is equipped with preamplifier, frequency selection, detection, AGC and shaping circuits. Tuning loops Li and C3 are tuned on the transmitting carrier frequency of 35 kHz, and the output
is a pulse signal. IC 2 uses a voice-activated integrated power supply SL517A, which has amplification, bistable triggering, driving and other functions. The pulse is
amplified and triggers the bistable circuit. Every time an infrared light signal is received, the circuit flips once and the thyristor (VTl) changes its on and off state to achieve
highly reliable infrared remote control.