[hpsdr] OT HV power supplies

[Chris Albertson]

>
>
> > I'm looking for a supplier of SMPS with a nominal 240V AC input and 250V
> > DC o/p at 1 to 2 amps. Anyone know where I can find one? I was in contact
> > with a company in India but that seems to have fallen off the radar!
> >
> > This is required for a project to build a replica of EDSAC the computer
> > built at Cambridge Uni Maths Lab in 1948/9.
>


Are you using SMPS because you need to save power and run cooler.  I'd have
to ask "why bother" if you are building a vacuum tube computer.    It would
be easy to build a linear supply.  I think you might be able to use a
common isolation transformer.   These are easy to find in any size you
need.   they have 240VAC output and then the CRCRC filter can drop it some
to the required voltage with the two series resisters.   I'd bet this is
how they did it in 1948.   The SMPS will be electrically noisy unless you
take care to make it not so.


-- 

Chris Albertson
Redondo Beach, California
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