Op amp: Differential config.

Discussion in 'Homework Help' started by Steve1992, Mar 26, 2010.

  1. Steve1992

    Thread Starter Senior Member

    Apr 7, 2006
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    I came out with this solution for Vo:

    (V1 - V2) x (Rf/Ri +1).

    But its hit or miss when I change the values in a simulator.

    How would solve it?
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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  3. The Electrician

    AAC Fanatic!

    Oct 9, 2007
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    Just guessing, I would think something like this would be correct:

    Vo = V1(Rf/Ri + 1) - V2(Rf/Ri)

    But then you still have the problem of determining V1 and V2 (V1 being the + input of the opamp).

    You have two things labeled V1 on your schematic; bad practice.
     
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