BJT Test

Discussion in 'General Electronics Chat' started by erpay, Mar 18, 2007.

  1. erpay

    Thread Starter New Member

    Mar 12, 2007
    2
    0
    I want to ask 2 questions about BJT.
    1-How can i test a BJT whether it is defected or not?
    2-How can i determine the type of the BJT (NPN or PNP)
     
  2. Distort10n

    Active Member

    Dec 25, 2006
    429
    1
    You can forward bias the BE and BC junctions with a DMM. They both should read ~0.7V for silicon. Reverse biasing the BE and BC junctions should read ~3V. This is for an NPN. The reverse would be true for PNP.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The one lead that will conduct to both other leads is the base.
     
  4. erpay

    Thread Starter New Member

    Mar 12, 2007
    2
    0
    Thanks for your answers.
     
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