John Fields
Building an isolation transformer
Nov 25, 2004
5 Replies
Hello
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?
In a word, No
Where did you look? They are widely available from various UK suppliers. For example, CPC have a range, including this one at
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Or use
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And Rapid Electronics have several, at
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Terry Pinnell
Hobbyist, West Sussex, UK
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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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