[kfowler]

I have a 120mm computer fan that I wired to a DC tranformer. The fan runs great but it runs full speed all the time and I would like to reduce it to a less audible level. The fan has three wires. Red, yellow and black. I currently have the red and yellow wired together to the hot wire from the transformer. I've read that the yellow wire is typically your speed control wire. If so, is there a way I can wire this to control my fan speed. Like can I get a speed control devise from Radio Shack? If so, how do I rewire this.