Op-Amp Help

Discussion in 'General Electronics Chat' started by dasloth12, Jul 1, 2009.

  1. dasloth12

    Thread Starter New Member

    May 26, 2008
    2
    0
    Hi All,
    i need some help with building an op-amp circuit to take a 0V-5V signal from a DAC and swing from -10V to +10V. Do i use a non-inverting amp config and tie the inverting input to -10V instead of ground? any help would be appreciated.

    thanks
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Basically. You don't have to use -10V though, a summing circuit can also have gain.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at the attached for a couple of different approaches.

    The 2nd one looks easier, but the input offset voltage of the opamp will get amplified by the output more, introducing more error.
     
  4. AdrianN

    Active Member

    Apr 27, 2009
    97
    1
    Last edited: Jun 26, 2010
  5. AdrianN

    Active Member

    Apr 27, 2009
    97
    1
    Or, if you want to use a non-inverting amplifier as you suggest, you need to have a 3.3V in the inverting input, as in the attached schematic. There will be a small error because, when the DAC is at 0V, the output will be 3.3V times the gain of -3 which is -9.9V not -10V. However, you can adjust the 3.3V level to give you an output of -10V.
     
  6. dasloth12

    Thread Starter New Member

    May 26, 2008
    2
    0
    Thank you all for your help :D
     
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