Not really a rheohbus. I liked the Sunbeam bus with blue/red LED showing intensity, but I plan to make a couple of acrylic cases, so I wanted to DIY acrylic bus . I also found out that the Sunbeam does not mix the red/blue, so I made mine so it can . So I did some research: http://www.cpemma.co.uk/ef.html I could have gone with low dropout voltage regulators, but decided the best thing to suit my taste was the transistor method. The voltage range is from 6.3V to 11.5 volts. The PNP Tip32 are rated at 3Amps, making each channel 36 Watts. There are 5 fan controllers, and I rigged up red and blue LEDs to fade with the voltage intensity. I did this by placing the red LED between 12V and the output, and the blue LED between output and a 5V regulated source. So some testing: And some planning: And some wirewrapping: Im waiting on some 3/4" rods and compound, and a couple more tools to make a finished front plate and knobs, but for the moment I used ghetto style to show the prototype: The only flaw functionally is that the 5V reg is sinking the current instead of driving it, leaving the blue LEDs on all the time without load. They work just right with a load, but I may either just wire up the 5V from the molex or use a few rectifiers to hold the 5V at the end of the blue LEDs. Will post finished product when done.