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Home-use fan IR remote control circuit

2014-11-23 17:38  
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Home-use fan IR remote control circuit
The diagram is home-use fan IR remote control circuit. This remote controller includes emitter and receiver controlling parts. The nucleus of IR emitter is an astable multivibrator which consists of 555 and R1, w1, c1, andits resonance frequency f=1.44/(R1+2Rw1)C1,whichis adjusted to 38KHz to drive infrared-emitting diode HG310 or HG450 and emit infrared pulse. Infrared receiving tube should match to transmitting tube, and we should pay attention to light wave and light power. IC1 uses special infrared receiver manifold μPC1373HA to adjustthe L, C4 loop's center frequency in 38KHz, once it receives infrared light pulses, the signal is enlarged,detected,shapedby IC1to make IC1 output low level signal andBG2 stop accordingly, thenits collector outputs high level signal.