/diy/ - Do It Yourself

>>1095307

yep, what the other dude said makes a lot of sense, however it's completely wrong.

when the datasheet says 3.0V, that actually refers to a bell curve with a peak at 3.0V. so if you use a tiny resistor based on a 3V breakdown, and your unit's actual breakdown is 2.9V, then you get a massive current and your LED dies.

so, you never use tiny resistors in series with an LED because the breakdown voltages and, often, the supply voltages, are not absolute values, but are ranges of values.