> I have a transformer rated at 220 VAC primary, 24 VAC secondary @ 750
> VA. I am looking for 12 VAC out so I will connect the 220 primary to 110
> VAC and get the 12 output. I think I know the answer to this but wish to
> avail myself of the experience and knowledge of others. I don't see
> problems but was concerned with noise, heating, life expectancy etc. of
> doing this.
> I would appreciate some feedback.

        Well, surprisingly, the issue isn't so much the voltage but the frequency.
A transformer is designed for a certain frequency and voltage, changing one
or the other may put you in a "bad" area of core saturation. However, if the
220V transformer is rated for 50Hz and you are feeding it 120V 60Hz that
danger is very remote, IMHO. TTYL

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