Infrared remote control circuit b

Shown are the transmitting and receiving portions of a typical infrared remote control circuit . The remote control transmitter part is mainly
composed of the transmitting chip htPD1913C, 455 kHz ceramic resonator, infrared light-emitting diode, operation buttons and other parts; the remote control receiver part is mainly composed of the remote control receiver
pPC1373H, crystal, 4-bit microprocessor and peripheral components Made up of other parts.
    When operating the remote control button, the manual command signal is encoded, modulated and output by the transmitting chip VPD1913C, and
then amplified by the amplifier VT1 and sent out by the infrared light-emitting diode: it is received by the photosensitive diode of the remote control receiver part and The remote control
signal is sent to the remote control receiver VPC1373H for amplification, filtering and shaping before output, and finally sent to the microprocessor to output
control instructions, control the actions of the remote-controlled equipment, and implement corresponding functions.