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How many windings do I need on a toroid to make a joule thief work? Answered

How many windings do I need on a toroid to make a joule thief work? Is there a min and or max number of winding? Is the toroid acting as a one-to-one transformer? Can I use anything as the iron core? Is there a calculation to find this out? Thanks for any help.

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Re-design

8 years ago

Try 8 to 11 turns.