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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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photo eye NPN vs. PNP
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 |
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