Simple queston about transistors

Discussion in 'General Electronics Chat' started by tadm123, Jun 1, 2014.

  1. tadm123

    Thread Starter Member

    Nov 20, 2013
    43
    0
    Assuming it's configured on active mode. What exactly determines the amplification that you'll get from the base current into the collector current?

    Is it the Beta parameter in the transistor or is it determined by the specific Votage source and resistor that you choose to put in the collector?

    Thanks
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,449
    3,367
    Both.

    We usually consider a common-emitter amplifier with regards amplifying an AC signal applied to the base of the BJT. To determine the voltage gain, it is instructive to examine the characteristic curves of the transistor, in particular, how the voltage at the collector traverses along the load line.

    [​IMG]



    If beta, Vcc or RL is changed, the amplification will change.

    For full explanation, see this:

    http://www.electronics-tutorials.ws/amplifier/amp_2.html
     
    tadm123 likes this.
  3. tadm123

    Thread Starter Member

    Nov 20, 2013
    43
    0
    I'll give it a read, thanks a lot.
     
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