Problem with transistors

Discussion in 'Homework Help' started by MrRockchip, Nov 4, 2010.

  1. MrRockchip

    MrRockchip Thread Starter New Member

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    I have 5 problems, which are similar to each other.
    But I need an example. Please, help me to solve this one:
    (and I will solve the remaining 4 by myself)

    [​IMG]
  2. Kermit2

    Kermit2 Well-Known Member

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    I'm a long time out of school, but I think at least one more piece of info will be needed to answer that. Yes it will either conduct or not conduct at the extremes, but I believe the transistors gain must be known to get an expression for the output.
  3. MrRockchip

    MrRockchip Thread Starter New Member

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    If don't count the thermal current, then you have all the necessary data.
  4. Kermit2

    Kermit2 Well-Known Member

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    well like I said, I'm out of school a long time, so carry on smartly then soldier
  5. hobbyist

    hobbyist Well-Known Member

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    Take a look at your circuit, the bottom transistor has it's base emitter junction conducting because it is forward biased, however the collector is not biased at all, due to the top transistor being reversed biased, and not conducting.

    So your voltage is the voltage of a open collector transistor with full base voltage applied.

    This is just a somewhat educated guess.
    Last edited: Nov 4, 2010
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