"K7ITM" wrote in message
...
It's easy enough to find the number of turns required for a particular
inductance on a known toroid core, but how do you know what size wire
to use so that the turns will all fit on a single layer? That's this
morning's geometry problem. I suppose you can find formulas, but a
quick Google search didn't turn up anything useful for me this
morning. What I worked out, that may be of some use to others, is:

Nice, but the software "Mini ring-core calculator" (ver 1.2 free) will do
this for you, as will the Amidon manuals.

W4ZCB