@benikens: yeah, that is more of a last resort. it can control a lot of fans and all. i have one on my gaming rig.
@rubix_1011: to control fan speed.
Basically I want a easy circuit that I can build to make a fan controller that will controller my fan depending on the water temperature.
That is what I want to do. I just need some help in building the circuit. I do not want to buy something that has many fan controllers when I only want to controller one maybe two. I am building this on my server because the fans on it our so loud.