The title pretty much says it. When I'm charging my MBP, my power brick buzzes. Doesn't seem to once the machine is charged, and its definitely the power brick... not the MBP.
Yes and no. I've always had exceptional hearing when it comes to high-frequency noises... which the buzzing is. So while I can hear it pretty clearly when its sitting on my desk, I wouldn't classify it as loud.
hey next im just gonna start by saying don't worry... eletricity is weird and alot of my power "bricks' do this.. my phone.. my older laptop... etc.. try a different plug its just the way the frequency comes out and your hi pitch ears will make it annoying to you =/