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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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More   Light Detectors

40KHz Light Detector with High Ambient Light Immunity
designed by David A. Johnson, P.E. (Dec 14, 2004)

This circuit is designed for detecting infrared light modulated at around 40KHz.  Itís feedback scheme cancels much of the DC component from ambient light.  Itís conversion factor is about 100 millivolts per microwatt of 900nm light.

Click on Circuit Below to view PDF of Schematic

More   Light Detectors

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