Nixies, was Re: Octal

[Tony Duell]

> 
> 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 

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). 

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. 

-tony