Realization of high-sensitivity infrared remote control receiving circuit with special IC

Realization of high-sensitivity infrared remote control receiving circuit with special IC

Circuit function

The purpose of the circuit is the same as the "infrared remote control receiving circuit using a single IC to simplify the circuit".

Circuit working principle

Because the PIN photodiode is used to receive the optical signal and the output signal is weak, a resonance circuit is added to the high gain amplifier to amplify the 38KHZ carrier signal with high sensitivity, and then the signal is peak detected and waveform shaped. The output of the circuit is open collector.

The resistance R2 and the Q value of the resonant circuit are cut off, the higher the gain. The application range of this circuit is not only limited to infrared light, it can also be used as a wired control circuit when connected to optical fiber, and can be changed into a multiplex transmission circuit, and can also be used in conjunction with LSI for transmission and reception control.

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