/diy/ - Do It Yourself

trying to reverse engineer drum core inductors as I plan to build some custom ones down the line

using some formulas I found online and some stupid questions
>is u initial same as ur
>are my guesses for Aeff and leff even in same direction

I suspect I need to dig deeper into gapped core calculations and just calculate without gap, as overall it looks like current formula is more suitable for rod ferrite rather than multi-layered drum core inductor