[hpsdr] OT HV power supplies

[Phil Harman]

Hi Chris,

Some years ago I modified IBM PC SMPSUs to give 13.8v @ 20A for use with
HF radios.

I wrote an article explaining how to do this which you will find here:

http://www.ifwtech.co.uk/g3sek/smps/smps.htm

The site has a lot of useful information in relation to SMPSUs.

Initially I rewound the original transformer from the PC PSU but later on
I found it much easier to wind my own. Adding more turns on the secondary
and selecting higher voltage diodes and caps would give you the voltage
and current you need.

In the end I built my own from new parts rather than scrap PC units and
they are still in use today.

Also have a look at  K7DYY's home page (http://www.k7dyy.com/) he sells
Class D AM transmitters and uses a SMPSU to generate the HT - one of
Bruce's PSU boards may do the trick.

73 Phil...VK6APH


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi
>
> Sorry this is off topic but I know there is a wealth of knowledge
> associated with this reflector.
>
> 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.
>
> Any help would be appreciated - even designs for 'home building' though we
> need about 20 units.
>
> Cheers & 73
>
> Chris G4NUX
>
>
> http://www.edsac.org/
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