Ultra-Sensitive Photosensor Ignores Ambient Light

October 1998
Electronic Design;10/12/98, Vol. 46 Issue 23, p102
Trade Publication
Describes a circuit design that preserves the photocell sensitivity with electronic feedback to produce an ultra-sensitive photo detector. Lamp voltage set at 9 volts; Change in photocell resistance from ambient room light to dark; Current source; Divider string; Integration time constant; Adjustment of the sensor to sense the presence of clear glass; Creation of a large-value non-polarized capacitor.


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