[sdiy] LED current source needed for 'digital' outputs?

Neil Johnson neil.johnson71 at gmail.com
Tue Mar 4 17:17:05 CET 2014


cheater00 wrote:
> Similarly you could switch between a visible and invisible led, or anotger
> diode.

I used a zener diode.  You don't want a switch - too expensive, and
you are still likely to get some sort of current spike during the
switch transition which will generate HF noise.

Neil
--
http://www.njohnson.co.uk



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