With the gradual mastery of permeability by ferrite technology, the size of inductors has decreased to a level that is now quite difficult to describe. There was a time when inductors could be beautiful creations of copper wire staggered layers in large hollow inductors, which were realized through ingenious winding technology. This matter attracted the attention of [brett], who built a machine that could produce something close to the original.
Part of this article is an investigation of history. These coils once appeared at the consumer level, but now only a few highly confidential companies have remained. Nevertheless, they are still worth pursuing because they can provide the high “Q” factor required by high-quality tuning circuits. The rest will introduce the design of the wire feeder and the Arduino motor control of the project in detail. There should be enough room for any other experimenter to try their hands on layered inductors, so maybe we will see this lost art make a comeback.
Custom coil is a regular requirement of any product from radio, musical instrument to switching power supply. Therefore, it is not surprising that there are quite a number of projects featuring coils that have been successful here. A more unusual recent phenomenon is the rotation around a ring.