"Karl Townsend" wrote in message
anews.com...
I'm about to purchase a photo eye. http://tinyurl.com/6bjmeb

What's the difference between PNP and NPN? I just want an eye that's NC
powered by 12VDC that uses very little power.


Karl



Karl

It has to do with the output transistor construction. From a practical
point of view, if your load has to be grounded get the PNP, if the load has
to be tied to the power supply, get the NPN.

CarlBoyd