Question about transistor biasing

Discussion in 'General Electronics Chat' started by hkntrt, Jun 20, 2012.

  1. hkntrt

    Thread Starter New Member

    Jun 20, 2012
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    0
    Firstly i want to say thanks for that great documentation.I have a question about transistor biasing formula used in that lesson.Why Re resistor is 470Ω ?
    My calculation is wrong ?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Actually

    V_{BB}=I_BR_B+V_{BE}+V_E
     
  3. hkntrt

    Thread Starter New Member

    Jun 20, 2012
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    0
    Hmmm 1μA . 33κΩ = 0.33 V

    1.5 V = 0.33 V + 0.7 V + Ve

    Ve=0.47

    Ic = 1 mA

    Ic≈Ie

    0.47 V / 1 mA = 470 Ω

    Now i understood , thanks :)
     
  4. Rbeckett

    Member

    Sep 3, 2010
    205
    32
    What lesson are you talking about? Which book, and chapter are you looking at please. I missed that so I had better go and learn it now, before I get into a mess.
    Thanks.
    Wheelchair Bob
     
  5. absf

    Senior Member

    Dec 29, 2010
    1,492
    372
  6. hkntrt

    Thread Starter New Member

    Jun 20, 2012
    13
    0
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