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Re: [TCML] Ballastwith adjustable Core
If the core were laminated, you would get a linear control as the core is moved in and out of the coil. What you probably want is some #14 soft iron wire that is coated with a thin layer of insulation such as polyurethane, cut it into 12 inch sections, and bound up into to a cylinder core. Works for me, though it will still heat some (it's pretty small)... I built a larger core of this type.
Where do you get soft iron wire these days????? How do you straighten it?
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