Adjustable light detection switch circuit

Published:2011/6/22 3:38:00 Author:TaoXi | Keyword: Adjustable light, detection, switch circuit | From:SeekIC

The R2 can be used to set the threshold value of the circuit. When the light intensity of the PC1 surface reduces, the resistance (a tin sulfide light resistance) of PC1 increases. This makes the voltage of 741 reverse phase input port to reduce. When you use the R2 to adjust the reference voltage of 741 in-phase port, as long as the PC1 has no light, the comparator will has the low level, this conducts Q1 and makes the relay K1 to act.



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