Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Photodiode question.

Status
Not open for further replies.

Shizusoup

New Member
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?
 
A transistor will take an on-off signal then invert it into off-on.
 
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.
 
Last edited:
Status
Not open for further replies.

Latest threads

New Articles From Microcontroller Tips

Back
Top