Audio coupling signal with ground isolated

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Friends, which the best solution to connect signals of audio to ground isolated… ja I made with transformer with satisfactory result! it would like opinion for other forms of coupling that function with frequencia of 10HZ up to ones 80khz… will be grateful to that they will be able to help me.

thanks.
 
Friends, see drawing of the current system who I am using to isolate gnd of the audio signal ... liked to know other forms ...

thanks .
 

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