Quote Originally Posted by nemesis View Post
I just picked up a few of these. I was wondering the same thing. I found a few circuits on the net. Here is a few:

http://www.uoguelph.ca/~antoon/circ/sensor2.htm
http://www.acroname.com/howto/photor...oresistor.html

Please post back if you come up with anything.
Resistor?
Transistor?
Whats the difference?