Help!! trying to understand this circuit

Discussion in 'General Electronics Chat' started by KoolK, Jul 13, 2014.

  1. KoolK

    Thread Starter New Member

    Jul 13, 2014
    Hi All

    I am trying to understand what the attached circuit is trying to do but need help with that.

    Looking at the circuit the first OP AMP on the left is configured as an integrator clearly as there is the capacitor in the feedback path, but I do not understand what the second op-amp is doing. :confused: :confused:

    Here is my understanding of it but could be wrong: R775 / R104 are voltage dividers. R104 has current through it equal to that or R775. This stage would amplify the voltage over R104 in a positive manner.

  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    I think it maybe a motor speed ramp control,or motor driver.
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    Agreed. It's just a +/- voltage 3A DC (or LF) power driver, controlled from the voltage at input "set 2".