I had often read of the problem that is saved on the power supply. At first I was in good spirits, when plugging it briefly whistles very loudly, and then silenced completely, however, the power supply begins with a little load on the switch immediately, pathetic to whistle at different pitches and volumes. I will return the switch therefore. In the study that is unbearable. (FYI: I'm 25, still have pretty good ears Many elderly are presumably no longer perceive it..)
