Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Bengt Sjölund <bengt@t...> wrote:
> Hi guys,
>  
> I´m very interested in building one of these Power Supplies too, but I
> have problems
> in finding the parts listed in the drawings from Scott.
>  
> http://www.elfa.se/elfa-bin/dyndok.pl?dok=5014.htm
>  
> These are the ones I can get locally, cant you tell me what part no's I
> can use to
> substitute the 16A and 60A IRG4's.
>  
> Does anyone have info on the 100uH coils how these are winded?
>  
> Stefan, any clue on how big transformer we will need for this? You also
> use 240V as I do?
> Is there any mods that can be done to get it working with 240V / 50Hz
>  
>  
> Cheers
> Bengt
>  


Hi Bengt,

I ordered most of the parts from Digikey without problems.

I used a surplus 18 volt 2 amp transformer I had on hand and wound 12
guage magnet wire around surplus 2 inch toroids until I measured 100
microHenrys on my LCR meter.

For a 240 volt line you could probably use a full wave rectifier
instead of a bridge rectifier.

If the IGBT s are hard to find in the EU you could use Mosfets and
reconfigure the drivers.  Probably be cheaper anyway....

HTH

Curt