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Audio amplifiers?

Discussion in 'Electronic Basics' started by capitano, Jul 25, 2003.

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  1. capitano

    capitano Guest

    Is there any reason why an op-amp amplifier would not be as
    good as a dedicated audio amplifier. I.e. why do people spend
    time designing audio amplifiers (or pre-amplifiers) where a simple
    op-amp and 3 or 4 resistors could act as an amplifier ?
  2. Bob

    Bob Guest

    In a nutshell, the custom-designed amplifiers (usually comprised of discrete
    active devices) are believed to be more accurate for the reproduction of
    complex signals, like music.

    The goal in hi-fi amp design is create a circuit which has intrinsically low
    open-loop gain and distortion, and then uses minimal (or no) loop feedback
    to obtain the required performance and/or specs. Opamps have extremely high
    open loop gain, so with low closed loop gain then the amplifier is
    constantly correcting itself to reproduce the input signal with the desired
    closed-loop gain.

    Whether or not a non-opamp amp really sounds any better than one that uses
    opamps is a matter of debate, conjecture, opinion, psychology, profit
    margin, etc...

    BLAUJUNK likes this.
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