![]() If this is for a commercial application (and you have appropriate budget) then there are a few specialist companies in the UK which can design inductors to order. ![]() In interference suppression, the cores are used in EMI Filters for attenuating high-frequency noise energy over a broad frequency range. For the smallest, highest power devices you need to have a lap-wound (tidy layer wound) coils which conduct the heat well (as opposed to random pile-wound). Ferrite cores in a transformer are one on which the windings of electric transformers and other wound components such as inductors or chokes are formed. You can also buy ferrite rods from Maplin or other electronics hobby stores for a couple of pounds/dollars apiece. The core probably needs to be made of ferrite - the only "home source" for that is a ferrite-rod internal antenna from an unwanted mediumwave or longwave radio. For 100uH you would normally use some kind of ferrite core, but the particular material chosen depends on the highest frequency that the inductor is required to work at. ![]() If it needs to carry more current then you'll need thicker wire and everything will get bigger. ![]() If the power was very low you could use very fine wire and make a very compact inductor. You also need to specify what normal maximum (and maybe pulse) current you want the inductor to handle (this is related to power-dissipation). ![]()
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