Gain of a push-pull BJT amplifier? (Basic)

Discussion in 'Homework Help' started by Fraser_Integration, Oct 8, 2010.

  1. Fraser_Integration

    Thread Starter Member

    Nov 28, 2009
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    Hello. For my lab project this semester i have to build an audio amplifier that has an pre-amp stage using op-amp circuits, and an output stage using a BJT power amplifier, all to be driven by 3 or 4 1.5V batteries. Class B / AB has been suggested. My University is annoying in that it gives you the practical before the theory so you are inclined to do research yourself but I am not getting far.

    Two things I wanted to ask, in the norman push-pull arrangement as in this link from the project pages: [​IMG],
    what will be the gain of the arrangement? If it is dependent on beta, is that not bad practice?

    Also, mroe generally, do you think having a simple non-inverting amplifier op-amp set up for the preamp, feeding into a BJT amplifier for the output stage is sensible?

    Thanks
     
  2. Jony130

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  3. Fraser_Integration

    Thread Starter Member

    Nov 28, 2009
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    the current gain then maybe!

    why do they call it a push-pull amplifier if you don't get any amplification of the input signal?
     
  4. Jony130

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    Feb 17, 2009
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    Last edited: Oct 8, 2010
  5. Fraser_Integration

    Thread Starter Member

    Nov 28, 2009
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    Ah, thank you very much. That is most useful.
     
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