base or fixed bias

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Discussion in 'General Electronics Chat' started by amaresh92, Nov 7, 2010.

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  1. Nov 7, 2010 #1
    amaresh92

    Thread Starter New Member

    Oct 31, 2010
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    i wonder if anyone could tell me the working of base bias in detailed.i am not able to understand it.
    advanced thanks.
     
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  2. Nov 7, 2010 #2
    Audioguru

    Expert

    Dec 20, 2007
    10,247
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    A transistor needs base current for it to turn on. But transistors even with the same part number have different amounts of current gain and different amounts of base-emitter voltage so a voltage divider is used to feed bias current to the base and an emitter resistor is used to reduce the variations among transistors.
     
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  3. Nov 9, 2010 #3
    amaresh92

    Thread Starter New Member

    Oct 31, 2010
    23
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    how does base currrent remains constant and what makes it to be constant?
    thanks.
     
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  4. Nov 9, 2010 #4
    Audioguru

    Expert

    Dec 20, 2007
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    If the supply voltage is regulated then the voltage divider feeding the base and the emitter resistor make the base-emitter current constant.
     
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