3 Sep
2006
3 Sep
'06
7:46 p.m.
On Sunday 03 September 2006 06:50 pm, Tony Duell wrote:
Oh, I wasn't suggesting that, simply pointing out that once you got your
isolation a simple rectifier would do the trick just fine...
I've had my experiences with non-isolated equipment, more than I ever wanted,
and don't plan to build any to add to that. :-)
On Saturday 02
September 2006 06:25 pm, Tony Duell wrote:
I would seriously recomend against rectifying the mains for something
like this. Non-isolated PSUs have the nasty habit of making things live
that you least expect, and may kill you (or worse, damage a classic
computer). [...]
Another way to do it is to use 'back to back' mains transformers.
Connect the 'secondary' (which is now used as a primary) of a small
mains transformer to the (AC) output of the trnasformer you're using to
provide the logic supplies (or to the output of another mains
transformer if you're using the SMPSU for the logic). Then rectify or
voltage double the output of this extra transformer (the winding that
was originally the primary) to get about 200V DC.
You don't need a voltage doubler to get most of the way there. Peak
voltage of a lightly loaded rectifier-filter setup running off "110" (or
"115", "117", whatever the case may be -- it seems to be trending
higher
as time If you use back-to-back transformers as I've
suggsted, the actual voltage
got get out depends on the turns rations, of course. Maybe a simple
rectifier will be enough, maybe you need a doubler.
Many suggestions that I've seen illustrated like that suggest using two
identical transformers, which should get you the same thing out as you put
in.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin