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

Discussion in 'High Voltage' started by faria shah, Jul 1, 2010.

  1. faria shah

    faria shah New Member

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    i cant get when will the base will be get open or short to conduct through emitter???help plzzzzz
     
  2. faria shah

    faria shah New Member

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    yes plzzzz help me out
     
  3. Grossel

    Grossel Member

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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 :)

    I just did. You don't have to point it out, it's a waste of time.
     
    Last edited: Jul 1, 2010

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