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Building an isolation transformer

Discussion in 'Electronic Basics' started by ed, Nov 25, 2004.

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  1. ed

    ed Guest


    I would like an isolation transformer (1:1) for the UK mains. I can't seem
    to find any off the shelf designs though. If I bought 2 of the same step
    down transformers (i.e. 240V to 12V) I could take them apart and build a new
    transformer, which consisted of the 2 primary coils. Does this sound like a
    good idea?
  2. In a word, No <g>

    Where did you look? They are widely available from various UK
    suppliers. For example, CPC have a range, including this one at
    Or use

    And Rapid Electronics have several, at
  3. Hi,

    Have a look at sec.4.4 of this -

    Remember that earth and neutral are handled differently here in the UK.
    Only the earth wire is 'earthed' locally with the neutral going all the way
    back to the transformer.

    Cheers - Joe
  4. John Fields

    John Fields Guest

    Try bottom posting.
  5. Bob

    Bob Guest

    Do you bottom post on emails, too?
  6. No need to. Just use the 12 V output of one transformer as input for the
    second, its output will be (almost) 240 V again. IIRC this was covered
    in an elector paper years ago.
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