[sdiy] KN-75 optocoupler

[np]

Tom Wiltshire schrieb:
>
> Strictly this is true, and it isn't a good idea, but in practice 
> you'll mostly get away with it.
> I've tested loads of LEDs by giving them a quick flash on a 9V 
> battery, and it doesn't kill them. Mostly 9V batteries aren't a full 
> 9V either, unless you just got a fresh one for the test. Pull one out 
> of a flanger pedal instead!
> However, leaving them running like that would certainly be fatal.
As a child I had a tendency to do destructive things like that with all 
kinds of components.

I remember that to my (and my fathers) surprise such a torture-test on a 
5mm LED powered by a 9V bench supply lasted for more than two weeks!

The poor LED wasn't glowing bright after the inital two seconds but it 
was still emiting light. Maybe 1/10th of the usual brightness.

---
Nils