infoFormula used in this
calculation is from the famous Wheelers approximations
which is accurate to <1% if the cross section is near
L (uH) =31.6*N^2* r1^2 / 6*r1+ 9*L + 10*(r2-r1)
NOTEThis formula applies at ‘low’ frequencies (<3MHz) using
enameled copper wire tightly wound.
Please note that the diameter is measured from center of wire trough
center of the coil and to center of the wire on the opposite side.
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