Op amps work on Arduino but not Pololu Organgutan

Discussion in 'The Projects Forum' started by Will292956, Oct 26, 2013.

  1. Will292956

    Thread Starter New Member

    Oct 20, 2013
    I'm using two opa241PA op amps for my project. The first one is a differential amplifier that just subtracts a reference voltage from the signal, and the second one is used for a gain of 9.

    On the ardunin seems to work exactly as its suppose to, but on the pololu the differential amp appears just scale the signal up by 2 and the second op amp doesn't do anything ie. Vin=Vout. I have tried it on multiple analog ports on the pololu and checked the wiring several times.

    Do you guys have any idea what is going on here?

    Thank you.
  2. shteii01

    AAC Fanatic!

    Feb 19, 2010
    Not enough information.