Hi,
I am making progress with my idea of making my own speed controller.
I decided I would try to make a miniature speed controller with my arduino and the electronics I had lieu my around-



I used an H-bridge microchip an then just lots of wires!
It controlled the speed of one small motor and a servo and has the ability to run one more motor.
My plan is to use one of the microchips from an arduino then make my own circuit board to wire it all up, then I will use a lot of mosfets or some solid state relays. I want it keep it as simple as possible to make it reliable and rugged.