noise filter

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Hi

I am building a setup with two cheap class d amplifiers from ebay. and a cheap Bluetooth audio player.
but I have some problems with noise in the sound.

there are no filters at all, and I think it could be from ground loop noise or noise from the power net.

what kind of filters are recommended to build ? is a audio transformator enough, to isolate the two devices ?
or do i need some more ?
thanks
 
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This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.