General infrared remote control switch

Published:2011/6/1 20:48:00 Author:Christina | Keyword: General, infrared, remote control | From:SeekIC

Working principle: the infrared remote control switch circuit is as shown in the figure. It is composed of the infrared receiving module, the triode VQ1, the D flip-flop, the driving triode VQ3, the relay, the relay working status indicator LED, the ZD1 voltage-regulator diode and the triode VQ2.etc. The infrared receiving module of the circuit detects the remote launch 37.9kHz negative pulse sequence, there negative pulses change into the positive pulses by VQ1. Then these positive pulses change into the single pulses by the R4, VD1, R5 and C2 network. The positive pulses of the VQ1 collecting electrode charge the C2 through R4 and VD1. The charging time constant (R4 X C2) is about 1.25ms.



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