Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Do you mean that you want a circuit for a simple servo motor ?
If you have a potentiometer tied to the mechanical output of the motor, you can use the output of that in an op-amp against your set point voltage to produce an error voltage. Use this to drive a H-Bridge amplifier.
It's very simple and will produce hunting, but it might suit your needs.