Op Amp Gain

Discussion in 'Homework Help' started by unborn, Mar 23, 2009.

  1. unborn

    Thread Starter New Member

    Mar 19, 2009
    7
    0
    Hello...

    How to calculate the gain for this circuit because the original output from the bridge is so small and cannot be measured. Thank you

    [​IMG]
     
  2. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    There appears to be an error. R7 should go to ground.

    hgmjr
     
  3. unborn

    Thread Starter New Member

    Mar 19, 2009
    7
    0
    hello...

    i have change it to ground but i forgot to change on the diagram. I need your help on how to calculate the gain for the op amp because the original output from the bridge is too small and cannot be measured. Is there any way how to calculate the gain by calculating the gain based on the resistor attached to the amplifier. Thank you
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
  5. PRS

    Well-Known Member

    Aug 24, 2008
    989
    35
    If Vin is taken at the input to R4 the gain of the amp is -R6/R4 where the negative sign simply means 180 degree phase inversion. Your amp has a gain of 2200 volts per volt.
     
  6. unborn

    Thread Starter New Member

    Mar 19, 2009
    7
    0
    Hello.

    Thank you very much that help me a lot.
     
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