>That's a much better explanation; thanks.  Each LED has
>its own current-limiting resistor, but the primary reason
>they're in parallel rather than series is because the
>number isn't necessarily constant: there will be from 1
>to 10 LEDs in each of the three circuits.  Some number
>may be removed, or may not, and the three circuits may
>not have the same number of LEDs.

Ah, so you didn't give Olin the complete picture - should you really dis him 
so badly? Running LEDs in parallel is generally a bad idea - without a 
resistor for each one -  so his comment on your design shows what he is 
continuously on about - incomplete design information means one cannot 
design to a spec. 

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist