Binocular (2 hole) Ferrite Core, Mix 61 - 5 pack - 1"/27mm tall
Ferrite binocular cores are wonderful for making many different ratios of voltage baluns/ununs and magnetic baluns for balanced loads. Typical ranges of ratios are 1:1 to 16:1. Our 9:1 beverage transformer uses the BLN68-61 core featured below. Shown in the picture below is a 1:1 current balun made with a BLN61-61 and #28 wire.