> > >The 12.6V transformer output is rated with the primary at
> 230V. Now I am
> > >considering using it on 277VAC. This should bring the
> input to the 7805
> up
> > >to about 120% of the 8.9V, 0r about 10.7V.
> >
> > Don't do that!
> >
> > I think that you will cook your transformer if you
> over-voltage the input
> > that much.  Core saturation.
>
> Doesn't core saturation depend on current, rather than
> voltage? I would
> think that you'd have less chance of saturating at 277V than 230V.
>
> Bob Ammerman
> RAm Systems
>

   But no-load current depends heavily on primary coil voltage.
How about having 1A no-load current with 277V? (Core saturation).

   Mike.

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