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Joule thief with a twist

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BillTodd:

--- Quote ---It's weird, but it seems to work. To make sure, that the oscillation happens between those two coils, I pulled them slightly apart, and it stopped.
--- End quote ---

Nothing weird :-) the two coils are magnetically coupled when close  just as if they were wound on the same former . If you place  pieces a permeable material on the top and bottom , you'd have a toroid .

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