$5 Fan Controller at ModdersHQ.net
 

Today we are looking at one way of keeping your loud fans from bleeding your ears. For a long time, modders have had to buy either a fan bus or rheobus to control the fans in their systems. Of course, the truly thrifty modders have made custom controllers for themselves, but most of them are complex and involve bread boards, resistors, rheostats or potentiometers, bus wire, and of course switches. Well, today we are going to show you a simple and more importantly cheap way to control all the fans in your rig with a single switch.

http://www.moddershq.net/guides.asp?guideid=14



I always test it with a mult-meter off of the system before hand.;)