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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Monday, April 21, 2008 04:18 AM

Comparator Circuits   Light Detectors or Optical Sensors
 
XENON LAMP FLASH DETECTOR
This circuit uses a small 2.5mm square photo diode in conjunction with a 100mH coil to detect the short light flashes from a xenon lamp.  The coil makes the circuit immune to normal room lights.  Its 10mv sensitivity can detect light flashes from a range of over 100 feet.  Reflections from a room’s walls and ceiling is usually enough to trigger the circuit.  The entire circuit draws only 3 Microamps from a 6 to 9 volt battery.
 

Click on Drawing Below to view PDF version of Schematic

Xenon Light Flash Detector designed by David A. Johnson, P.E. (Feb 14, 2002)

     Comparator Circuits   Light Detectors or Optical Sensors
Master Schematic Category List - David A. Johnson, P.E.
 

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