LED displays (TIL305, TIL308, etc.)

[Roy J. Tellason]

On Friday 03 October 2008 14:27, Tony Duell wrote:
> > > 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.
>
> 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.

> > 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 :-)

:-)



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