Op amp help

Discussion in 'General Electronics Chat' started by Highlight, Jul 13, 2012.

  1. Highlight

    Thread Starter New Member

    Nov 26, 2010
    28
    0
    I have a DC signal that goes from 0-3V and need an op-amp circuit that converts this to -1V when the input is 0 and +12V when the input is 3V. So my equation will look like, Vout = (13/3)Vin -1. Can this be done with a non-inverting configuration or does it have to be inverting because of the -1? Ive been trying to design this for a few hours but nothing works out.

    thanks.
     
  2. WBahn

    Moderator

    Mar 31, 2012
    17,743
    4,795
    Consider the standard non-inverting amplifier configuration:

    The input goes directly to the non-inverting input while the output goes through two series resistors (R1 then R2) to ground and the feedback to the inverting input is taken from the junction of the two resistors.

    Now consider what happens if you take the output to some other voltage (call it Vref) instead of ground?
     
    absf likes this.
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