I was curious about these LED's:  Can you mix colors? 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of Bob Ammerman
Sent: Sunday, April 03, 2005 17:23
To: Microcontroller discussion list - Public.
Subject: Re: [pic] 16f88 PWM LED control

 Jan-Erik opined...

> Common [cathode] meens that you can't (easily) drive the LED
> from a higher voltage source [than] the PIC is running from.
> Common anode is easier to use in that regard.

Sure you can. You just have to think upside down. Let us assume you have un 
unregulated 6V supply. Instead of using a positive regulator to create +5, 
use a negative regulator to create -5, relative to the positive terminal of 
the unregulated supply. The PIC connects between that -5 (as gnd) and the 
positive side of the unregulated supply (as +5). The LED's common cathode 
connects to the negative of the unregulated supply.

Bob Ammerman
RAm Systems



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