Need help with transistor question

Discussion in 'Homework Help' started by bnm119, Mar 2, 2011.

  1. bnm119

    Thread Starter New Member

    Dec 14, 2010
    4
    0
    Hello,

    I'm having trouble with this particular question, which I have attached below. The question states that I find Ic1,Vc1,Vce1,Ic2,Vc2,Vce2. I have found Ic1,Vc1,Vce1 which are 4mA,5.2V,5.2V respectively. However, I cannot get the right answer for Ic2. I don't know if my KVL is messed up or something else. I hope some one can help me. thanks in advance

    The beta for this question is 100 and both transistors are silicon-based.
     
  2. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    You got what you got right. To get Ic2 look at the voltage Vb2 = Vc1. Then Ve2 = (Vb2 - .6) = (5.2 - .6) = 4.6 volts and Ie2 = Ve2/Re2 = 4.6/4700 = 1mA and Ic2 is about the same, so Vc2 = 30 - 1*20 = 10 volts.
     
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