Rodent of Unusual Size wrote: > 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. But this doesn't really argue for parallel versus series configuration. A current source can accomodate different numbers of LEDs too, with them wired in series. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist