Hi:

I would like to experiment with a 3 color LED to see what colors it can
make.
The commercial color LED drivers seem targeted for cell phones and are
extremely small surface mount parts making them difficult to work with.

I would like to have good control of the current in the Red, Blue and
Green LEDs.  The forward drops for the 3 colors are considerably
different with Blue a little over 3.5 Volts.  This is a problem in that
a small change in the supply voltage or LED temperature will cause a big
change in the LED current is simple dropping resistors are used from a
+5 Volt rail.

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?

Have Fun,

Brooke Clarke, N6GCE
http://www.PRC68.com

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