AC noise problem

Discussion in 'MacBook Air' started by rustzone, Feb 1, 2014.

  1. rustzone macrumors newbie

    Feb 1, 2014
    Hey, guys! So, here’s my problem. Some time ago I noticed that when I connect AC adapter to my MBA, quiet continuous noise appears in my headphones. It's not loud and isn't heard with music, so I was ok with that. But when I connected an external usb sound card and tried recording guitar, I heard the same noise in the recorded audio. Tried recording without adapter - noise became quieter, but didn't stop. The problem is not in sound card (I tried it with other MBA and there was no noise) so I figured it must be in my mac. Any thoughts?
  2. DmbShn41 macrumors 6502

    Jun 22, 2009
    Sounds like this is electrical noise through the line voltage. Is the charger plugged into a properly grounded outlet? What about a surge protected outlet? If you have one or both available, try it and see if the audible noise goes away.
  3. rustzone thread starter macrumors newbie

    Feb 1, 2014
    The thing is that I tried my friend's mba with exactly the same power outlet and it worked without any noise.
  4. case2001 macrumors 6502

    Sep 9, 2010
    Did you use your AC adapter with your friends MBA?
  5. rustzone, Feb 2, 2014
    Last edited: Feb 2, 2014

    rustzone thread starter macrumors newbie

    Feb 1, 2014
    No, I used his. But anyway, the noise is heard even when recoding without adapter.

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