Monostable photocell circuit

Posted on Jul 5, 2012

A photocell circuit provides automatic threshold adjustment. Monostable action prevents undesired retriggering of the output. With only one op amp IC, the circuit offers: Automatic adjustment of its trigger level to accommodate various light sources, changes in ambient light and misalignments; A built-in monostable action to provide only a single output pulse during a preset time; Feedback action to raise the threshold level after triggering and to speed switching.

Monostable photocell circuit
Click here to download the full size of the above Circuit.

The feedback also eliminates the circuit's tendency to oscillate during switching.

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