Power Transformer Help (non BH)

[dmannnnn]

I have a piece of equipment for sale and an interested buyer in asia.  He wants me to convert it to 230vac.  It currently uses an Avel Lindberg 250va torroidal with dual 25vac secondaries.  I cannot seem to find anything equivalent in 230 volts.  It seems that both Avel Lindberg and Plitron only make 120vac transformers. 

Any ideas where to look?  A custom transformer would probably cost too much or take too long.  Is a step down his only option?

 

[Paul Joppa]

Many companies - Hammond is one - make toroids with dual primaries for 117/234 volts. Mouser lists them.

 

[dmannnnn]

One set of each? so it could be switchable?

Thanks!

 

[Tre]

I believe there are two 117 volt primaries. Use them in parallel for 117 and series for 234. So yes, you could make the amp switchable.

 

[dmannnnn]

Yes, the transformer I'm using now has two 117v primaries and two 25v secondaries.  So if I wire the primaries in series and plug into a 234v line I will still get 25v at the secondaries?

 

[Tre]

Yes.

 

[Grainger49]

Be sure to wire the two windings so they add.  If you get the second winding out of phase I think the output will be zero, theoretically zero.

 

[dmannnnn]

Excellent.  Thanks guys.