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Title: Large ferrite 19mm (0.748 in.) ID - 30 cents Post by: Opcom on November 07, 2020, 09:59:09 AM These are not mine, not affiliated. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
BG Micro has these toroid cores on sale, 30 cents is dirt cheap I think. I don't know how long the sale is for. https://www.bgmicro.com/ferrite-torroid-core-emi-noise-filter-31mm-x-16mm-x-19mm.aspx Ferrite Torroid Core EMI Noise Filter 31mm X 16mm X 19mm Ferrico FT-5-31X16X19 31mm Diameter on Outside 16mm Thickness 19mm Diameter Inside |