For 40 mH I think I have 4- 500 turns. So now I need only 40- 50 turns. Right?
And the inductor is a transformer EE type which I found in an old smps.
Thanks.
That is correct: inductance is proportional to the square of the number of turns.
The energy in an inductor is proportional to the square of the current flowing through it.
Just to check, the EE core is ferrite not steel laminations.
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