wrote in message
oups.com...
There are a number of cool on-line calculators, Google "LED Resistance
Calculator:.

I'm partial to this one:
http://metku.net/index.html?sect=vie...calc/index_eng

Just remember Ohm's law (V = I x R) and you don't need a funky website to do
this. Besides, this one is a bad example, with the parelleled LEDs on the
3rd diagram.

Meindert