3 Sep
2006
3 Sep
'06
3:50 p.m.
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).
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
[...]
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