Op-amp circuit

Discussion in 'Homework Help' started by jut, Mar 7, 2009.

  1. jut

    Thread Starter Senior Member

    Aug 25, 2007
    224
    2
    [​IMG]

    From simulating the circuit, I know that Vo is 2V.

    But I tried to write 3 KVL equations to solve for Vo manually just cannot get the right answer.

    Help please!
     
    Last edited: Mar 7, 2009
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    I can't see your attachment. Can you?

    hgmjr
     
  3. jut

    Thread Starter Senior Member

    Aug 25, 2007
    224
    2
    Ok, I uploaded the picture to a different website. Can you see it now?

    Can you upload pics to this website?
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Now it is visible.


    hgmjr
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Where are your calculations?


    Note that there is no current through R1, assuming an ideal op amp.
     
  6. jut

    Thread Starter Senior Member

    Aug 25, 2007
    224
    2
    OK, i got it figured out.

    In my first attempt I forgot factor in that no current flows through the 1.5k resistor. So therefore the same current flows through both 2k resistors. Then a couple KVL equations yield the correct answer.
     
  7. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Good for you! :p
     
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