Which is forward bias and which is reverse bias?

Discussion in 'The Projects Forum' started by mujizat, Aug 10, 2010.

  1. mujizat

    Thread Starter New Member

    Aug 10, 2010
    2
    0
    I was debating with my friend about this scheme.

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    I think the R1 is a forward bias to base-emitter junction while the R2 is reverse biased for the base-collector junction. But my friend believes otherwise. According to him, R1 is reverse biased, while R2 is forward biased.
    Then, how do you think?
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
    Actually neither, they set up a voltage/current that forward biases the transistor, and since they operate as a pair, they both forward bias the transistor.
     
  3. mujizat

    Thread Starter New Member

    Aug 10, 2010
    2
    0
    Here is my reason, Mr Bill. What about using a single resistor, eg only use R1 with proper value for class A application, or only use R2 for class B application. What about R1 and about R2 for both examples?
     
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