Laptop charger making buzzing sound?

  Emmacx20 17:55 30 Aug 2014

I've only noticed this today, but I normally have music/something playing on my speakers so I probably wouldn't have heard it before. It's not like SUPER loud, in fact it's pretty much inaudible unless I put my ear up to the charger, I only noticed it when I leaned over it to pick something that had fallen up. I'm just wanting to check that this is fine? I did read a comment somewhere else that said unless it was super loud it's fine, but I mean it's always best to be on the safe side right? I've had a few problems with my laptop before, specifically it not charging, and then another point where the screen failed to show things? But yeah anyways my laptop is a Samsung, and the charger is just the one that came with it when I bought it.

  Fruit Bat /\0/\ 18:23 30 Aug 2014

230v AC transformer drops voltage to approx 20v which is rectified to DC and smoothed.

The noise is from the transformer it hums

bigger the transformer louder the hum walk past any electrical substation and you can hear the humming.

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