Common mode chokes make good joule thief inductors- the coupling is high.

 

A common mode choke also makes a fairly good audio isolation device to reduce ground noise. Some folks refuse to accept that concept though.

 

Yes.
Common-mode chokes normally are connected with the windings in parallel, one for the hot lead and one for the common.
That makes the common-mode inductance 1/2 of a single winding, since two equal inductors in parallel have half the inductance, just like two resistors in parallel.

Common mode chokes can not connected in parallel ,as it will saturated.

 

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