On Wed, 06 Jan 2010 16:54:59 +0000, Ian Bell wrote:

Pretty much but I was trying to avoid having a bleed resistor
permanently across the supply. The PSU has a lot of stored charge and a
bleed resistor that takes only a nominal 1% of the load current would
take about 5 minutes to discharge it. That in itself is not a problem as
the PSU is in an enclosure but when I am testing it, it is a pain to
have to wait that long.

You seem to be changing the design criteria. As I understood it the design
brief (if you like) was that the connections on the outside of the box had
to assume safe potentials in the time it took a British Standard Idiot to
unplug the connector from the power amp and plug his finger in there
instead. Now you seem to be saying you want the potentials within the
PSU box to drop to safe levels in some arbitrarily short time so you can
stick your finger on conductors inside the PSU box without harm. That's a
different problem. I think what I was proposing addresses the original
problem, but if you want to make it safe for yourself to prod around in
the PSU arbitrarily I suspect that's going to be a non-trivial problem to
solve.

--
John Stumbles

Time flies like an arrow
Fruit flies like a banana
Tits like coconuts