> >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

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