There are formulæ for deeply wound coils, and for coils of spaced turns of round wire or of flat tape. The discussion of inductance at high frequencies is less precise than the rest of the book ...

After years of knowing this relationship, but not knowing the specific formula for calculating, I found this formula in the book High Speed Digital Design: The formula shows inductance as a ...

[Homemade Audio] takes us through their manufacturing process for these coils, and the result is a watchable video resulting in some very well-made components. The adjustable former is a machined ...