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Common mode line chokes, can they be used at 50Hz?

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neazoi

neazoi

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Hello, recently I got a bunch of failed SMPSUs. All of them have toroid common mode chokes in the mains input.
Looking at the net they come into 1mH inductances or so.
My question is:
Can I rewind them and use them for 50Hz experiments, are these suitable for 50Hz?
Also are these really high permeability cores?
 

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