How to bias a PNP transistor?

Discussion in 'General Electronics Chat' started by opa627bm, Mar 2, 2012.

  1. opa627bm

    Thread Starter New Member

    Nov 26, 2011
    16
    0
    Hello everyone,
    I've found some PNP Ge transistors and want to build an audio amplifier from it. I used to work with NPN a lot and I know the way to bias them is to use a two resistor voltage divider. However, because the PN junction in PNP is reversed, the resistor divider dose not work anymore. I searched many website but none of them is talking about how to bias a PNP.
    Can some one tell me how to correctly bias a PNP tranristor?

    Best
    Lee
     
  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    If you take a good NPN design, and change the power supply from positive to negative, it will work. You will have to reverse the polarities of polarized capacitors also.
     
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