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MFJ-3506, BOOK, FERROMAGNETIC-CORE DESIGN , APP. HANDBOOK Features_Lower Spacer Plate Hide the base by coveringIf you use inductors and transformers with magnetic cores, you need this book. By the late, legendary designer and amateur radio operator Doug DeMaw, W1FB. The only book that emphasizes practical aspects of magnetic cores, you need this book. By the late, legendary designer and amateur radio operator Doug DeMaw, W1FB. The only book that emphasizes practical aspects of magnetic core materials from low frequencies through UHF. In depth understanding of