2 Sep
2006
2 Sep
'06
5:30 p.m.
On Saturday 02 September 2006 06:25 pm, Tony Duell wrote:
[...]
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
goes on) will normally be up around 170VDC, which is what I keep seeing in
circuits that are using Nixies. With enough of a filter capacitor and a
light load it won't drop by much, you'll get increased ripple instead as the
load goes up, which won't be visible because it's too fast.
--
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