Buzzing sound


I have the HiFiBerry Amp plugged into the RPI A+ and am runnning the latest version of Volumio (1.5). After an rpi-update I have the Amp working but... there is a buzzing sound audible, especially during the quieter pieces. It's only audible when the soundcard is active, if I stop or pause the track then it disappears. Additionally, I have the volume set at just 9% as anything loader than this is just too loud in this room - granted it's late ;-)

Has anyone else experinced this buzzing noise, and if so, is there a fix? FWIW, I have tried two power supplies, the current one is 12V/2A.

Many thanks!


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