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Jean-Claude Wippler from Jee Labs is making a DIY RGB LED Strip Driver Board and has documented the results and build details in a few posts. Here is a video that shows what the end result looks like. This project is going to allow for fully adjustable lighting in the Jee Labs, with a typical RGB light strip you should be able to achieve any color you want! “I wanted to simply control RGB. This is very easy to do with three MOSFETs. I used IRLZ34N’s N-channel, since the LED strips are common anode. The circuit is trivial: drain to ground, source to LED cathode, and gate to an I/O pin. Repeat and rinse three times. “
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June 14th, 2010
Source and drain are mixed up in your quote here. He’s corrected it on his site, just a heads-up
Anything with LEDs, especially RGB LEDs, is awesome. 
June 14th, 2010
reminds me on an ambi light project for an TV. http://www.vdr-wiki.de/wiki/index.php/Atmo-plugin (sorry, german only) but full building plans included and it runs under widows too.
there’s also an advanced version http://www.vdr-wiki.de/wiki/index.php/Solarstorm (sorry, german too) where every single led is controlled what makes the ambi light smother.
June 14th, 2010
Neat stuff! Am currently working on a project which achieves the same thing (though using a quad Darlington array). Building above kitchen cabinet lighting which uses Arduino+WiShield+homebrew Darlington proto shield+RGB LED strip to allow control of the LED strips (color and brightness) via TCP packets for two separate lighting units. Not fully documented yet but project status is at http://www.asynclabs.com/forums/viewtopic.php?f=19&t=387
Greg
June 14th, 2010
HUGE overkill on that circuit. I built the same thing with a 12f 8-pin PIC and can do any combination of colors and effects.