At 06:57 PM 11/29/2006, you wrote:
>Olin Lathrop wrote:
> > Brent Brown wrote:
> > > I've checked and double checked that my two primary windings are
> > > wired in parallel
> >
> > Oops.
>
>No, (checking again), that's right... 2 x 115V windings in parallel, 
>operating on 115V.
>This is for use in the US. Checked phasing of the windings too.
>
>In series would be for 230V operation. Incidentally I use a 
>completely different
>transformer (single 230V primary) when I build this for 230V 
>operation as they are
>very much cheaper.

What happens if you just power up one primary?

Are you sure there's not a short on one (or both) of the secondaries, or that
they are not connected in parallel with the wrong phase (a series short)?

Have you powered the transformer up, just sitting on the bench, not soldered
into a board?

Could you have destroyed the transformer or could the transformer otherwise
be defective (overheating can lead to a shorted turn)?

This is a very simple device, and you should NOT be getting the heating you
are observing unless something is VERY wrong.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com




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