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Photodiode question.

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Shizusoup

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Ok, so in a nutshell I'm trying to make something that turns on when not in light, and off when in light, i know that photodiodes can turn on electronics when in light, but is there something that works in reverse?
 

audioguru

Well-Known Member
Most Helpful Member
A transistor will take an on-off signal then invert it into off-on.
 

MikeMl

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A photo diode leaks nA to uA in the dark, and conducts up to a few mA in bright light. Use it to control the base current of an NPN transistor and that will switch a few tens to few hundreds of mA. Use a Darlington, and you can get Amps. Use a FET, and you can get Amps. You can configure the output switching device either as ON in the dark, or ON in the light.
 
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