Heating, noise and life expectancy would not be too much of an issue. The
issue would be the 750VA power rating which would be reduced to 375VA, if
you lower the voltages. In an ideal transformer, noise, heating and life
expectancy would be unaffected by lowering the voltages.

There is always some saturation that occurs at full rated voltage resulting
in some additional noise, heating and reduced life expectancy. But, for your
application, the transformer should exhibit lower noise, heat and show an
increase in life expectancy (because of the lowered stress), if you keep it
well below your new constraints. Hope this helps.

\manu

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of techhead
Sent: November 4, 2002 10:27 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [OT] XFORMER


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.
Thank You.

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