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if the a transformer can lower the voltage from 230 to 12v ac @ certain amount of current, given the same transformer can you give it say 24vac and still get a proportional output on the secondary?

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Yes. If the transformer produces 12 V from 230 V, then it will produce 1.25 V from 24 V. It will be grossly overspecced for 24 V in, so will be heavier and more expensive than at transformer intended for the same 24 V in at the same power level.

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cool just curious. I thought it would work since it just uses induction. – Ageis Mar 31 '12 at 20:51
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@Ageis - BUT !!!!!!!!!!!! it does NOT work the other way :-). You may not apply a HIGHER voltage to a winding than it is rated at. (A VERY small % over-voltage may be Ok but not much.) – Russell McMahon Apr 1 '12 at 7:43

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