> Quick question: I thought the new consumer automotive power supply
> was a nominal 42V (3x 12V batteries in series).  Has that changed?

42V, that's the one.

> My standard input & load-dump protection circuit is a series diode
> followed with a series 47R 5W resistor.  The clamp is a P 1.5KE-33
> (or 30V, depending on the regulator) transzorb.  That works for me
> because most of my stuff runs on 100mA or less.

I need roughly 100W here. :(


> As I've mentioned in the past, the absolute worst load-dump situation
> I've had to deal with was a 24V (nominal) earth-moving machine in a
> coal mine.  The external lighting was about 100A - the 24V buss
> jumped to about 80V for almost 100ms when the lighting was switched
> off.  I had assumed at the time that the only reason the voltage
> didn't go any higher was that one or more of the rectifier diodes in
> the alternators (2 of them) was breaking down.

That's useful to know. I'm expecting the 24V vehicle systems to be the
worst environment.
Sounds like the 42V system won't me much (any?) noisier than the
existing 12V systems.
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