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Pre-amplifier and Amplifier difference?

Discussion in 'Electronics Homework Help' started by myheart22, Dec 5, 2010.

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  1. myheart22


    Dec 5, 2010

    Goodevening, I am a 3rd yr ECE student from the Philippines.

    Until now I am confused with the difference between Preamplifier and Amplifier.
    We had a design proposal on Audio Power Amplifier but then, our work is always been trashed by our professor because I can't answer him what is the purpose of the preamp if there is already a power amplifier. :/

    Moreover, can you please tell me what is the advantage of having a preamp. And what may be the output if I didn't include the preamp on our design.

    Any kind of help will be much appreciated. Thank you! :)
  2. Resqueline


    Jul 31, 2009
    Hi, and welcome to the forums.

    I haven't seen your design proposal but I'll nevertheless try to help you get into the thinking of the professor (as I see it).

    What are the definitions of amp's, power-amp's, and pre-amp's? What would their respective input & output signal ranges & impedances be (V/A/W/Ohms)?
    Rough terms suffices, like high, low, mV, V, etc.
  3. Laplace


    Apr 4, 2010
    Would you place the most attention to low-noise electronic design in the pre-amp or the power-amp? Why?

    Would the volume control, equalization, and tone controls be placed at the input to the pre-amp or at the input to the power-amp?

    What is the voltage gain and current gain of each amplifier? Would the pre-amp be able to drive large speaker coils?

    Can you put the pre-amp and the power-amp on the same board/case and just call it the amplifier?
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