trying to understand op-amp circuits

Discussion in 'General Electronics Chat' started by TL314, Apr 6, 2015.

  1. TL314

    Thread Starter Member

    Mar 29, 2015
    The unity gain op-amp circuit seems simple, but what use is the amp if it only provides a copy if the input? Why couldn't we just use a wire to connect the source (input) to its load (output) since its just the same? Vin=Vout?
    Confused o_O
  2. cornishlad


    Jul 31, 2013
    The input impedance will be high and the ouput impedance low. So there is power gain avalable.
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  3. Mike33

    AAC Fanatic!

    Feb 4, 2005
    It's known as a 'buffer', and it amplifies CURRENT rather than if you need to drive something with a low input impedance, which would objectionably load down the circuit which precedes it, you can use a buffer to isolate it from that loading...
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