RS-232 Tx / Rx monitoring LEDs?

tony duell ard at
Fri Aug 21 10:36:55 CDT 2015

> for a high voltage diode but makes the resistor hotter.
> Some red LEDs glow orange when not protected from 12VAC.

I discovered (over 35 years ago) that green LEDs glow orange if massively 
overcurrented (you know what I mean). No they don't last long like that. It
doesn't appear to be a thermal effect though.


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