inductors intended for high-frequency applications must have relatively high self-resonant frequencies to function as designed. Diagram describing actual inductor capacitance and self-resonant ...
But there’s another group in the world of electronics with an interest in high-quality inductors, namely the audio enthusiasts. They need good quality inductors with a values in the millihenries ...
Toroids look resemble doughnuts and differ in terms of diameter, thickness, permeability and type, depending upon the frequency range of interest. Toroidal cores also have a high level of inductance ...