Ground noise - original Bela

mattymatt

hi
I have an original Bela with audio output going to a Scarlett 4i4 interface. I am powering the Bela via USB, plugged into a wall adapter. Everything works really great but there is a persistent high-pitched noise. I thought it was ground but made sure that everything is plugged into the same power strip. I tried a Bela Mini and am having the same results.

What's the secret here? THanks for any tips.

giuliomoro

That's expected if you have also the Bela connected to your computer via the usb cable because that's going to generate a ground loop