Don't forget the vital formula relating minimum number of Turns N, Core cross sectional area A (m^2) RMS Voltage V, and Saturation flux density B (use 0.15 to 0.2 Tesla for most ferrites) :
V = 4.44.F.N.A.B
copied from Andy G4JNT
interstingly enough path length and gap length afect current but not saturation.
another cuase of saturation is lack of de magnetization
Colin =^.^=
fun!!
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