3.90mH 12ga FoilQ - .422Ω 1000W - Copper Foil Air Core Coil.
ERSE high quality copper foil coils are made from high purity 99.99% copper foil and a thin high purity BOPP polypropylene film. The surface area of copper foil eliminates skin effect seen in some air core inductors and improves mechanical stability thereby eliminating microphonic distortion. The reduced skin effect allows the DC resistance to track the A.C. resistance making for an ideal inductor.
