My Idpi is emitting a low humming sound. I have not noticed this before, but it is definitely the Idpi and it stops when it is switched off from the power.
Have I just not noticed this because of playing music, which drowns out the sound, or has the Idpi developed a fault? It has a hifiberry digi+ hat. It plays perfectly, but I am finding that I need to switch it off every time I end a listening session.