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The photoelectric counting circuit

2014-11-27 05:13  
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The photoelectric counting circuit
See as the figure, when thelight dependenttriode VT1 receives the infrared rays from the diode, VT1 is conducting, the inverting input terminal 6-pin of the comparator IC2-8 is in a low LEV, 7-pin outputs a high LEV which is added to the inverting terminal of the comparator IC2-A, which makes the 1-pin output a low LEV, so the lighting pipe in photocoupler 4N35 is glowing and the corresponding light dependent pipe is conducting, the triode pipe VT2 is conducting, VT2 pole outputs a low LEV. The something crosses between LED VD1 and the receiving pipe VT1, the infrared is blocked.