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Opamp help

Discussion in 'General Electronics Discussion' started by Badejavu1, Jan 6, 2016.

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  1. Badejavu1

    Badejavu1

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    Jan 6, 2016
    Can anyone please help with the equation for the gain/Vout in the opamp circuit?thanks image.jpeg opamp circuit.
     

    Attached Files:

  2. davenn

    davenn Moderator

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  3. BobK

    BobK

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    Jan 5, 2010
    This sounds like homework.

    The way to analyze op amp circuits is to determine an equation for the + input and one for the - input. To a good approximation, these will be equal, because, if not, the difference will be multiplied by 1,000,000 or more and sent to the output, which will put the output at the + or - rail.

    So write down the two formulae for the + and - inputs, then equate them, and you should have an equation for involving Vout, Vin1 and Vin2. For the 5V case, just substitute 5 for Vin1. Then solve for Vout.

    Bob
     
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    It's possible that he did and fortunately got a hit on EP. :)

    Chris
     
  5. davenn

    davenn Moderator

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    which I didn't see and why I gave several links for him to follow up on ;)
     
  6. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    I guess my point is we never know what new member might someday be an EP shining star. So we should be glad when they decide to check here first. We have more than enough collective brain power to help them without directly doing their homework.

    After all, many of us may deny this but reality is most if not all EP VIP contributors are here because we have IMMENSE egos. Except me of course! I'm humble..:rolleyes:

    Chris
     
    davenn likes this.
  7. Ratch

    Ratch

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    Mar 10, 2013
    Which gain? The gain of v1 or v2? Incremental gain or static gain? r1, r2, and v1 sets the voltage at the + and - terminals of the op-amp. Then is a simple matter of solving a node equation as shown below.
    Badejavu.JPG


    Ratch
     
  8. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    Ratch, PM Marty and let him know this is here. He loves equations! You can tell him I sent you.:D

    Chris
     
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