Another fantastic-as-always video from Rimstar! You can find the inductance calculator shown in his video below here on his website.
How to design a coil for a specific inductance that you need, including how to calculate the inductance and where to find an online inductance calculator. This goes through all the parameters: number of turns, area, length and relative permeability as well as mentioning some other factors like capacitance, frequency and coupling.
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