I will try to explain this the best I can sorry ahead of time for leaving anything out.
I have built the 2dof using ardunio uno. I am using the sabertooth 2x60 connected to 2 worm drive motors by motion dynamics powered by a car battery. Everything is working fine but the motors have a constant jittering sound and tend to get very hot after a short time of use. I have been trying to solve this problem but I can not get it worked out. I have tried caps across the motor leads but that does not seen to do anything, I am using hall effect pots with the level shift and amplify circuit suggested by sirnoname. I have also tried it with standard pots without the amplify circuit and it does the same thing.
Thanks for any help.