Re: Toroidal choke failure
I would suggest caution in rewinding or making a replacement unless you have the specs of the original.
Especially using a lighter gauge wire, there can be some very high peak currents in a class D amps output stage.
Class D amps can be very fussy as to that choke.
You need to know inductance, resistance and type of core.
If it's wrong, the output transistor/s (or FET, MOSFET etc) could be toast.
Terry
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