A friend of mine built a high current inductor using EI cores and copper foil, getting around the skin effect quite well. You're better off running multiple strands of wire in parallel for higher current. You can get away with fewer total turns and have more inductance.Īt high frequency, really thick gauge magnet wire isn't much help anyway due to the 'skin effect' (do a google search for more info). If they are rated and you still want high inductance can i reccomend stacking those too? placing the cores side by side sandwich style. If you're use your E-I cores do you know if they are rated for high frequency operation? if not they might heat up considerably. In addition its fairly easy to stack several toroidal cores to get very high inductance levels. Terribly tedious to wind but massively better than air-core when it comes to interference.
I would seriously reccomend trying to obtain some toroidal core inductors if possible. Heck, even the drum-core inductor of my cell-phone car charger ruins the reception on my FM radio (particulary in the 99-108 Mhz band). Don't know if this helps but here's my two cents:įor a radio transceiver application the interference from a switching regulator may be problematic if you use an air core inductor.
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