What does it suggest when my AC adapter for my laptop make a buzzing nouns?

My power adapter for my laptop make a slight buzzing sound when it is contained by use.



My adapter looks like this one:





http://i2.photobucket.com/albums/y26/cba...


Answer:

I'll turn with officer Karma's answer.
Homer, that's not a power adapter, that's my vibrator!
Probably worn out or not a good competence one to begin beside.



The sound comes from the transformer within the adapter.





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In addition to magnetorestriction near are two other reasons why transformers tend to let off sound.



The first is frail insulation. Just as the corona discharge from power lines in wet air produces a buzzing nouns, insulation breakdown in a transformer can also be rowdy. In practice, however, insulation breakdown usually occurs wide inside a transformer, where the fry stress is most severe, and no audible noise emerge until the final catastrophic failure.



http://www.newscientist.com/backpage.ns?...
Looks similar to a dell. It will buzz , not a problem.Wish mine only have a "slight buzz". Your first clue to a problem will be a burning smell.
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