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LM386 / Negative feedback.

Discussion in 'Electronic Design' started by Boki, Sep 30, 2005.

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  1. Boki

    Boki Guest

    Hi All,
    Finally, I decide to use LM386 for my audio amplifier, I think
    it is cheap and enough, am I right?

    One thing I not very understand is:

    why some circuits of application note has no nagetive feedback? and it
    can work?

    Does that mean the gain in that circuit is very small? Or why we will
    not get a saturation signal?

    Best regards,
    Boki.
     
  2. Boki

    Boki Guest

    It seems that I miss it, negative feedback from GND, and I right?
     
  3. First, it's not an op-amp, even though the diagram might suggest
    that. It's an audio power amplifier, so it's designed from the ground
    up for that, rather than a general purpose amplifier.

    IN the case of the 386, there is negative feedback, but it is built
    in. This will limit the maximum gain, but again it's intended for
    power use where voltage gain isn't the key factor.

    Note the 2 gain pins, pins 2 and 8. Those are across a resistor that
    is part of a negative feedback network inside the IC.

    Michael
     
  4. Boki

    Boki Guest

    : - )

    Thanks.
     
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