Precision Light-Activated Alarm Circuit

Posted on May 15, 2012

The light-sensitive CDS cell R8 configured in a bridge circuit with IC1 as a comparator causes ICl`s output to go high when light strikes the CDS cell R8, triggering SCR1.

Precision Light-Activated Alarm Circuit
Click here to download the full size of the above Circuit.

This lights LED1 and turns on opto isolator IC2, which switches the load.

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