so that i can control the speed of a 12v brushless water pump basiclly to control the speed of a spining motor to increase or decrase speed, i would like a dial type control like one comonly found on a volume nob on a radio or a sliding one a perfect example is like the ones found on some volume control headphones and the common house dimmer but thats too clunky and ac powered, so if you know what im talking abaut your help would be apreciated thanks.