Power a load with an op amp integrator

Discussion in 'The Projects Forum' started by chiciebee, Apr 23, 2012.

  1. chiciebee

    Thread Starter New Member

    Apr 20, 2012
    I have a small DC motor to run from a DC output pin on an Arduino board. I want the amount of voltage across the motor to increase with time so that the longer the pin is high the more voltage drops across the motor. When the pin goes low, the motor should stop.

    My initial design looks much like an integrator circuit, but with a 37Ω load on the output (see attachment). The voltage across the motor is not sufficient to drive it.

    What can I do to get the effect I want? Is this even the right method? Do I need a completely new circuit design? Thanks!