|Old Large BN-43-302 Cores|
|New Small BN-43-2402 Cores|
as Original Planned
One neat trick that I learned (in the distant past); before winding a DIY bifilar or trifilar wire together, stain one (or more) full length wires with colored Marks-a-Lot pen(s). The enameled magnetic wire takes stain reasonable well. A large felt tip pen and a slightly stretched (taught) wire makes the task easy. After twisting the wires and winding the cores, the stain will help make end identification much easier.
If I remember correctly, pre-stained filer wire is available for purchase, but I like DIY colored stained trifilar wire, because I can use any gauge of wire that I have available.
Based on the online Toroid Calculator, I may have only needed 4 turns on the BN-43-2402 Binocular Cores.
I had previously mis-published the part number of the Binocular Cores that I am using, the number and links have been corrected.
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