>Since there seems to be some interest in the use of LEDs as
>light detectors, I am including the attached drawing of one
>of my test circuits for evaluating ULTRABRIGHT LEDs.


Maybe not in this application, but we have noted that when used as light
detectors/photocells, green LEDs have a higher output than other types. MAY
be worth trying here, although I don't know if the wavelength has any effect
when dealing with smoke.

regards,



Russell McMahon

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