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Distortion from Laptop sound output

  • 06-04-2008 9:48pm
    #1
    sabiki2
    Registered Users, Registered Users 2 Posts: 41 ✭


    Hi,
    Wondering why I get awful electrical buzzing/distortion through PA speakers when I connect my laptop to AC power.

    I have a Dell Laptop Inspiron 1300.
    As a voluntary gesture to help out, I regularly have to play background mp3 music files in a hall (my own creations!)

    There is a PA system and a mixer box into which several microphones and my laptop are plugged into. I just use a simple 'phono cable?' from my laptop into the mixer.

    So, if I have the laptop on battery, there is no electrical interference/distortion on the PA speakers. If I connect the AC adapter to the laptop there is awful distortion through the PA speakers and I have to disconnect the laptops AC power cable.
    Anybody know what is the cause of the interference and is there anything I can do about it?
    Laptop battery life is noticeably fading at this stage so can't rely on battery power for the duration.

    Thanks.


Comments

  • #2
    Kensington
    Closed Accounts Posts: 3,683 ✭✭✭Kensington


    What you're hearing is mains hum due to a ground loop (two different equipment having two ground sources - Wikipedia has a lot of info about this if you're interested). Something like this should sort it out for you.


  • #3
    sabiki2
    Registered Users, Registered Users 2 Posts: 41 ✭sabiki2


    Excellent. That sounds exactly like it:
    http://en.wikipedia.org/wiki/Mains_hum

    I'll get hold of a 'ground loop isolator' and see if it sorts out the problem.

    Thanks a lot Kensington.


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