scaling from logarythmic to linear

    ćwiek
    Apr 16 2012 | 5:25 pm
    hi! i found a lot of examples in forum dealing with similar problems, but i cant get non of them working... I am going, to convert readings from voltage follower conected to arduino, and i have make a kind of simulation. thanks for advice!
    • big_pause
      Apr 16 2012 | 7:04 pm
      Unless I'm missing something, surely you just need to rearrange the equation (patch) on the left to give R in terms of the output.
    • Floating Point
      Apr 16 2012 | 11:26 pm
      the mapping you've got is of the form K=K/x-K/y which does not have an inverse (or more accurately it's inverse is itself), so I don't think you can remap to a straight line (mathematically not possible).
      Someone correct me if I'm mistaken
    • big_pause
      Apr 17 2012 | 7:27 am
      On the left we have essentially,
      y = U*x/(x + r1)
      rearranging this gives
      x = r1/(U/y - 1)
      Again, unless I'm missing something here