> > Think current source/sink with a good voltage compliance range,
> > then line length is a non-issue.
> 
> And does this go against what the others have suggested, or
> is there a difference between a current source/sink and a constant
> current source.

That's the same thing, and the advice is good. If you power you LEDs
from eg 12V you switch an NPN transistor from the 0/5V output of a PIC
(you use a PIC?) and you put a resistor between emitter and ground,
let's say 330 ohm, which determines the current. The LED is between
collector and +12V. No other resistors.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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