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2573 Views 2 Replies Latest reply: May 21, 2014 3:27 AM by LanceLK RSS
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May 2, 2014 10:49 AM

Voltage Follower circuit with op-amp

I've run across op-amps and have seen some of the circuits where op-amps are used to amplify or invert a signal.  But what is the point of a voltage follower?  That doesn't make much sense.  One voltage in, same voltage out.  What am I missing here?

  • davecuthbert Apprentice 87 posts since
    Feb 18, 2014
    Currently Being Moderated
    May 2, 2014 11:58 AM (in response to Riley)
    Re: Voltage Follower circuit with op-amp

    A voltage follower is used when a high impedance source needs to drive a low impedance load.

     

    For example, let's say we have the output of a 1M ohm oscillscope probe and we want to drive this signal into a 50 ohm oscillosope input. An Op Amp voltage follower can be placed at the output of the probe.

  • LanceLK Novice 49 posts since
    Apr 4, 2014
    Currently Being Moderated
    May 21, 2014 3:27 AM (in response to Riley)
    buffer

    if i am correct, its also called a Buffer Amplifier, or a voltage buffer, so that the input and output are the same voltage regardless of impedance. Without this, you would have a mismatch, and that would be bad for your circuit.

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