Ferrite Tutorials Ferrite Mix Selection Ferrite Cross Reference Ferrite Toroid Tech Specs Ferrite Chatter Noise RF Toroid Calculator by VK3CPU +3 FT140-77, ID=.9", RFI Range .1-10 MHz, Pack of 10 F140-77-10 $34.95 In stock Quantity: 1 Add to Bag Product Details MPN: F140-77 RFI Range (MHz): 100 KHz-10 Mhz ID-B (in/mm): .9/23 OD-A (in/mm): 1.4/35.6 Height-C (in/mm): .5/12.7 Weight (oz/gm): 33 grams Initial permeability: 2000 A(L): 2250 Ferrite Ring Toroid Core, ID = .9"/23mm, Mix 77. Excellent for low frequency switching power supplies. RFI range .1-50 MHz. Bulk pack of 10. Save this product for later Favorite Tutorials