Even with the kinds of coils used in chokes and transformers for ham radio ... The idea is to pass a small spool of magnet wire through the toroid’s core while simultaneously rotating the ...

This teardown of various IF transformers by [Unrelated Activities ... protecting a form around which one or more coils of fine magnet wire were wrapped. Some had tiny capacitors wired in parallel ...

Magnet wire is a copper or aluminum wire coated with a very thin layer of insulation. It is used in the construction of transformers, inductors, motors, speakers, hard disk head actuators, ...