Hi I seen this on this website does anyone now were i can buy one, web link http://www.bit-tech.net/modding/2002/06/22/knight_rider/2.html cheers
All kidding aside: Here's a thought: http://www.google.com/search?hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8&q=LED+light+chaser+how-to
you could always wire on through your parallel port, since i dont like the limitations of regular circuitry, and it cost me not a dime to wire up bunches of led's through my parallel port, thats how i did it, i gave it all sorts of different bouncing modes, and such just a thought, remeber that the 20 led version is nothing but the 10 led version with 2 led's running in series with each controlled output of the controller...
The 4017 datasheet shows you how to chain several together to get as many outputs as you want. Or there are other chips you can use.