Help Calculating Rb Collector Emitter Feedback Bias

Discussion in 'General Electronics Chat' started by Ronscott1, Nov 9, 2009.

  1. Ronscott1

    Thread Starter New Member

    Nov 5, 2009
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    Hey. I am designing an amplifier using collector emitter feedback bias. I am using a 2n5088 transistor, which has a minimum gain of 300 @ 1mA 5V Vce. I have Rc calculated to 3.6kOhm and Re calculated to 900 Ohm. How do I determine what value of Rb is needed?
     
  2. Ronscott1

    Thread Starter New Member

    Nov 5, 2009
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    Also when calculating the value of Re, should I have used the value of Ic given in the data sheet?
    Thanks guys
    Ron
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    Maybe you post the schematic and tell us more about supply voltage, voltage gain etc.

    But in general
    Rb = ( Vcc - (Vbe+Ic*Re) / Ib
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    A circuit schematic will clear things up. Also, what are the specifications of your amplifier, like gain, input-output voltages range etc.
     
  5. Ronscott1

    Thread Starter New Member

    Nov 5, 2009
    15
    0
    Hey guys its ok I figured it out.
     
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