COMBINED_LIGHT__DARK_ACTIVATED_SWITCH

Published:2009/6/17 2:30:00 Author:May | From:SeekIC

Two op arnps used in a bridge circuit configuration detect high and low light levels. Potentiometer R2 sets the dark level and R1 controls the light level. R3 is set so that about 1/2 the supply voltage appears across R4 at the desired light level. R1 and R2 set the trip point of the optoisolator IC2 at darker or lighter ambient levels, as required.



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