On Sunday, Apr 18, 2004, at 19:16 US/Pacific, Brooke Clarke wrote:

>
> One approach would be to use 3 independent current sources, each good
> for 100 ma and switch them on and off (PWM) with an 8 pin PIC.
>
> Is there a simpler way to do this?

PWM isn't hard. 100mA is a lot for this class of LED.  If you can get
by with 20mA, you can simply use a (tuned) resistor for each LED chip
to get the max current, and PWM to get the variation.  Ala:
http://www.emanator.demon.co.uk/bigclive/rgb.htm

BTW, "three color LED" usually means one with two chips (R&G), with
yellow output if your turn them both on.  The sort of thing you're
talking about would be a "3 chip LED", or "full spectrum LED", I think.

BillW

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.