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Monostable photocell circuit

2017-09-03 01:51  
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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

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

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