Using the output of an existing H-Bridge to control another H-Bridge?

Discussion in 'The Projects Forum' started by sloanthrasher, May 18, 2012.

  1. sloanthrasher

    Thread Starter New Member

    Mar 24, 2012

    I may be looking for a solution that's too easy to be possible, but here goes. :)

    I want to create a servo like those used on R/C models that will operate a linear positioner and move over a fairly large distance (about 3').

    My idea is to take a regular hobby servo, remove the potentiometer and the motor, and replace the potentiometer with a 10-turn pot, and the motor with a larger motor.

    In order to handle the higher load of the larger motor, my idea is to take the output to the existing motor, and use it to control another H-Bridge.

    My thinking is that this will be easier than creating the servo control electronics from scratch.

    I've created a quick and dirty schematic of my idea. It's not fully fleshed out, and is probably over-simplified, but it should give you an idea of what I'm trying to do.