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
    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?

  2. Ron H

    AAC Fanatic!

    Apr 14, 2005
    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.