AC noise problem

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

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  1. rustzone, Feb 1, 2014

    rustzone macrumors newbie

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    Feb 1, 2014
    #1
    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?
     
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  2. DmbShn41, Feb 1, 2014

    DmbShn41 macrumors 6502

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    Jun 22, 2009
    #2
    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.
     
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  3. rustzone, Feb 2, 2014

    rustzone thread starter macrumors newbie

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    #3
    The thing is that I tried my friend's mba with exactly the same power outlet and it worked without any noise.
     
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  4. case2001, Feb 2, 2014

    case2001 macrumors 6502

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    #4
    Did you use your AC adapter with your friends MBA?
     
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  5. rustzone, Feb 2, 2014
    Last edited: Feb 2, 2014

    rustzone thread starter macrumors newbie

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    Feb 1, 2014
    #5
    No, I used his. But anyway, the noise is heard even when recoding without adapter.
     
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