Light trigger switch composed of phototransistor

Published:2012/8/20 1:00:00 Author:Ecco | Keyword: Light , trigger, switch , phototransistor | From:SeekIC

As shown in figure, the circuit uses Darlington phototransistor and op amp, sovery faint light also can make the circuit flip. When R1 and photodiode's positions arereversed, and the op-amp inverting and noninverting input ends are reversed, the circuit can be modified for dark trigger switch.



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