Power adapter (that external thing) making whine?

While getting used to the CPU whine my macbook makes, today i was very supprised of a sound comming from the other side of my desk...
My powersupply (that thing from Delta Electronics ADP 60AD B) is making noice, and i'm able to influence that noice by my CPU usage!!!!
On low CPU usage it makes noice (it's very very high pitched, almost exact the same as the CPU whine) and very cracy (excuse my english, description is: like playing an LP with audio).
What is this? I do not have equipment i guess to record this sound, most older people will probably not even hear it (due to the high frequency; i'm 23 so still have good ears)... but this does not seem normal.. There is no fan or so inside that thing right?

Found multiple similar discussions... go to the largest up till what i found on:
http://discussions.apple.com/thread.jspa?messageID=3159676#3159676

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    Message was edited by: eww

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