Schematics > Motor, light and power control > LED Photo Sensor
LED Photo SensorHere's a circuit that takes advantage of the photo-voltaic voltage of an
ordinary LED. The LED voltage is buffered by a junction FET transistor and then
applied to the inverting input of an op-amp with a gain of about 20. This
produces a change of about 5 volts at the output from darkness to bright light.
The 100K potentiometer can be set so that the output is around 7 volts in
darkness and falls to about 2 volts in bright light.
LED Photo Sensor circuit
Title: LED Photo Sensor
Source: unknown
Published on: 2007-07-21
Reads: 2982
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