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Last Updated on: Friday, March 23, 2012 06:33 AM

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More  Light Detectors

40KHz Light Detector with High Ambient Light Immunity
 
This circuit is designed for detecting infrared light modulated at around 40KHz.  It’s feedback scheme cancels much of the DC component from ambient light.  It’s conversion factor is about 100 millivolts per microwatt of 900nm light.

Click on Drawing Below to view PDF version of Schematic

Circuit 40Hz Light Detector with High Ambient Light Immunity designed by David A. Johnson, P.E. (Dec 15, 2004)

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