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how would i build a circiut using NPN transistor making the result of OR gate??

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Just add two sets of a diode and resistor in series/parallell to the base. This will act as a NOR gate, so you have to put a inverting stage (another bjt NPN + resistor) to get an OR gate.

There is other alternative ways to achieve a OR gate just by PNP's and diodes :)

yes plzzzz help me out
I just did. You don't have to point it out, it's a waste of time.
 
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