Since the question of selecting the correct resister value for powering LED's comes up frequently, I did up a spreadsheet to make it easier for myself.
Then I thought why not put it on the forum for others who may find it useful?
So here it is.
It is the result of my own research and the input of several folks here on the forum; notably gunrunnerjohn and daleh. Their input is hereby gratefully acknowledged.
As usual, the author accepts no liability for its use whatsoever.
Any suggestions and or corrections are greatly appreciated.
This version is protected to maintain integrity, except for the yellow cells.
It is in Office 2007 format.
Have fun
Rod