Hi need help designing a circuit with a photodiode

ayilam · Apr 16, 2008

Hi i am using a photo diode to detect a red laser (its a continous wave).I just want to get a 5v signal wen the laser is is detected by the photodiode. can someone please please help me

Norlin · Apr 16, 2008

https://www.aaroncake.net/circuits/lightdrk.asp

replace the 9V source with 5V
replace the relay with your DMM or whatever else you're using that needs to read the 5V output

Or if you need it clean 0V and 5V, connect a buffer IC in place of the relay

Roff · Apr 16, 2008

Norlin said:
https://www.aaroncake.net/circuits/lightdrk.asp

replace the 9V source with 5V
replace the relay with your DMM or whatever else you're using that needs to read the 5V output

Or if you need it clean 0V and 5V, connect a buffer IC in place of the relay

We just recently roasted that crappy circuit, and Aaroncake's site in general.
https://www.electro-tech-online.com/threads/how-this-cricuit-will-work.38131/?highlight=dark+detector

Norlin · Apr 16, 2008

heh, guess I should bother to think whether or not the circuit works in the first place before posting about it well, the OP can look at that thread you mentioned

Hi need help designing a circuit with a photodiode

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