DC Voltage Level Shifter

Discussion in 'The Projects Forum' started by pe215, Mar 3, 2009.

  1. pe215

    Thread Starter New Member

    Mar 3, 2009
    2
    0
    I am working on an undergraduate project and I am inexperienced in electronics. I have a DC output from an differential amplifier using an op-amp. For simplification purposes lets say that the output from the op-amp varies between -3V to 3V. I would like to shift the voltage so that from -3V to 3V, I get something like 3V to 9V which I could then use to input into a power amplifier to run a DC motor.

    Any guidance is greatly appreciated.
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
  3. pe215

    Thread Starter New Member

    Mar 3, 2009
    2
    0
    Thanks. I am new to this website and I am liking it very much.
     
  4. Skeebopstop

    Active Member

    Jan 9, 2009
    358
    3
    You can also get tricky with a diff amp. See attached image. Note the inversion.
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    657
    He didn't ask for the output to be inverted.:(
     
  6. Skeebopstop

    Active Member

    Jan 9, 2009
    358
    3
    Hence my note to warn. Regardless, just flip the way you connect the +-3V to the diff amp to uninvert it. I am only speaking relative to the diff amp and this can be kept transparent to the input/output by such input connection flipping. This is the benefit of diff amps.
     
Loading...