Implementing a high-sensitivity infrared remote control receiving circuit using a dedicated IC

A PIN photodiode is used to receive optical signals, and the output signal is weak.
It is necessary to add a resonant circuit to a high-gain amplifier to
amplify the 38kHz carrier signal with high sensitivity, and then perform peak detection and waveform shaping on the signal. The output of the circuit
is a current collecting open circuit type. The larger
    the o value of the resistor and the harmonic loop (this value indicates the quality of the coil or capacitor
), the higher the gain. The application scope of this circuit is not limited to infrared
light. It can also be used as a wired remote control circuit when connected to optical fiber, and can be changed into a multi-channel transmission
circuit (to transmit multiple keying signals to distant places). Electric energy can be used for transmitting and receiving.
Used in conjunction with file-based LSI (Large Scale Integrated Circuit).