3 Oct
2008
3 Oct
'08
6:15 p.m.
On Friday 03 October 2008 14:27, Tony Duell wrote:
I am suprised. Over here, most mains transformers have 2 off 115V
primary windings that you connect in series for 230V mains (Europe) and
parallel for 115V mains (USA). I assumed (given that 115V-input
transformers are not commonly needed over here) that such things were
available worldwide.
I've seen those in some equipment, and not in other stuff from the same mfr.,
said mfr. being into distributing products worldwide. In some cases they'd
use a different transformer, rather than the single more "universal" one.
:-)
--
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"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Alternatively, consider using a transformer 'back
to front'. Start of
taking in mains and stepping it down to, say, 12V AC using a normal
transformer in the conventional way. Yo ucan rectify/smooth/regulate
that for your logic supply. But then take another 220V-12V trasnformer
and connect the 12V winding to the secondary (12V) side of the first
transformer. You'll get around 230V from the other (original primary)
winding of that transformer.
If you happen to have one handy in the USA, of course. Although
"universal" 95-240v transformers can be found in the US, most of the
small ones (such as are found in wall warts) are 120vac primaries
only. But if I had a
12vdc supply at sufficient current and needed to power
some nixies, I'd be sore tempted to work up a boost supply using any
of the currently available DC-DC converter ICs. EDN/Electronic
I really do find iron more reliable than silicon :-)