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More  Freespace or Light Beam Communication     
Light Detectors or Optical Sensors

LIGHT DETECTORS WITH AMBIENT LIGHT COMPENSATION 
 

These circuits were taken from a few application notes on infrared remote control devices. They use a current compensation method to separate the modulated light pulses from ambient light. They appear to have limited bandwidth and may only work at the 30KHz to 50KHz frequencies often used by TV and VCR remotes. I have not yet tested the circuits.

Click on Drawing Below to view PDF version of Schematic

Circuit 30KHz -50KHz Light Receiver  (July 6, 2000)

More  Freespace or Light Beam Communication     
Light Detectors or Optical Sensors

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