> This "enhanced" design has a serious failure mode - when it works at all,
> and that seems to be unpredictable - it "runs" at an accelerated rate.
>
> Sometimes it doesn't light up at all!   :-(
>
> How can this be?

It seems very likely that you have higher voltage or spikes present.

I'd expect that placing a large capacitor on the plug pack output would hel=
p.

Thought: Is plug pack definitely DC and not AC? (Unlikely) .


       R
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.