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Transistor Circuit Problem

  1. Apr 30, 2015 #1

    cpburris

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    Gold Member

    1. The problem statement, all variables and given/known data

    https://www.circuitlab.com/circuit/8ekkzw/dfsgadsfgdafgh/

    For the circuit, suppose that the input voltage V_in is a superposition of 18 V DC and a sinusoidal component with a 6 V amplitude (thus the input voltage varies between 12 V and 24 V). Diode D1 is a 4.3 V zener diode. Describe the output voltage V_out.

    3. The attempt at a solution

    Spent three hours already trying to figure it out, but I am just not getting anywhere.
     
  2. jcsd
  3. Apr 30, 2015 #2

    berkeman

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    Staff: Mentor

    We need more work from you before we can be of much help. Show us what all the node voltages are for 3 cases -- Vin = min, Vin = max, Vin = 18V...
     
  4. Apr 30, 2015 #3

    Hesch

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    Gold Member

    cpburris: Ask yourself two questions:

    1) What will happen if Vout > 5V ?

    2) What will happen if Vout < 5V ?

    ( Assuming that Vbe = 0.7V ).
     
    Last edited: Apr 30, 2015
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