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Old 01 April 2003, 15:53   #19
Now got GSX750F :))
Syko's Avatar
Join Date: Jun 2002
Location: Halifax UK
Age: 52
Posts: 584
max forward current is usually about 10 - 25 mA, which occures with about 1.5V across the junction, so for 5V supply that requires you to drop 3.5V @ 25mA.

Using Ohm's law where V=IR, gives V/I=R so;

3.5/0.025= 140 Ohms

easy peasy and if it's wrong feel free to shoot me, havent bothered checking it and this is the first time in over 12 years I've used it

Real reason is that a reverse voltage of much more than 25V will blow most LED's (VRmax). BUT as long as the voltage is less than this (and it should be!) then they'll be fine.
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