On Tue, Jul 5, 2022 at 09:29 PM, F1AMM wrote:
Hello
I have very little experience with toroids. I made some RUTHROFF transformers
but nothing more. On my cores, I note that the Al is not constant. Is this
normal ?
Yes the Al will vary with frequency for ferrite toroids. The reason is that the permeability of the ferrite toroid varies with frequency and the Mix (31,43, 75) etc. has a significant effect. Powdered iron Al only varies slightly with frequency.
Most of the online ferrite toroid calculators only provide good results at low frequencies. Here is an excellent online calculator for you to try >>
Roger
Roger Need