"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message
. 3.70...

When it arrived I found that P =
E * I was too complicated for them, it was physically sized for
0.1V
at 80A.

Heh! A lot of the old RTL and DTL mainframe computers had
prodigious
low-voltage supplies, rated in the hundreds of amps, and with
multiple
tens of Farads of filtering. I scrapped an SEL-840 from The Cape
that had
two four-foot-long 5/8" x 2" solid copper bus-bars for the logic
supply
rails in each of the six chassis cabinets.

Invariably in those old computers, you'll find at least one spot on
one
bar where someone has accidentally gotten a wrench or driver across
the
bar to ground. THAT must be exciting!

LLoyd

I worked on the development of 1980's computerized semiconductor test
stations with 100A of 5V power, largely for the power-hungry static
memory. Each board had its own 5V linear regulator card and the power
supply card cage was as large as the main one. The design engineer
filtered all that power so well that I could measure microVolts and
picoAmps on the device-under-test without interference from it.

At the last ham flea market I found some old 78000uF 40V computer caps
for the 20A variable power supply I'm building. After slowly and
cautiously reforming them until the leakage fell below 1 mA I checked
them by timing the charge to 20V at 20mA, which takes about a minute
and a half at 1 Second per 1000uF.

That's a lot of charge until you consider than one AA NiCad equals
around 1000 Farads.

-jsw