MadSci Network: Physics

Subject: Infrared intensity varying electric resistance

Date: Fri Nov 9 13:26:50 2007
Posted by No name entered.
Grade level: 10-12 School: No school entered.
City: No city entered. State/Province: No state entered. Country: No country entered.
Area of science: Physics
ID: 1194640010.Ph

Hello. I would like to make an electronic circuit which current or resistance
would vary according to the intensity of infrared (i would probably use a
potential divider). I've researched and apparently the photodiode is what i may
use. However, I am unsure about whether the photodiode just do "switch on" and
"switch off" of the current or does it have varying currents and resistances
throughout quite a good range? Thank you very much!

Re: Infrared intensity varying electric resistance

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