2019-03-06 Ferrite Toroid Cores 61 Mix

from FB group Building Transistor Radios 2019 Mar 5

I bought a bunch of ferrite toroid cores: Fair-Rite 5961001101 have 61 ferrite material and they’re about $.50 from Arrow.com. They’re 1/2 inch (12.7mm) OD and 1/4 inch (6.35mm) high. The edges are rounded so they don’t scrape off the insulation of the fine wires.

The core half filled with finer wire is 52 microhenrys. The core with green wire is 50 uH. The core filled with heavier wire is 100 uH. If the receiver is SW and will have an external antenna, the toroid is an easy way to make the tuning coil and have good isolation from magnetic interference.

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