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Posted on May 14, 2009
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Electrical interference on a DELL laptop.

I am getting electrical interference from the power supply on a DELL laptop when I attempt to record using the lineout from my mixer. The power cord has the 3 prong plug coming out of the power supply. If I disconnect the power from the PC and run on battery, no interference occurs. How can I solve this problem. Thanks..

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  • redurrer May 14, 2009

    I don't feel comfortable with this solution due to the safety hazard of not using the ground plug. If there is an electrical problem in the device, then the operator becomes the ground with potential fatal results.

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It's definitely the laptop power supply. Switching currents are being forced into the ground connection.

What you need is an isolation transformer between the mixer and the computer.

Never, ever lift the ground pin. It's called a safety ground for a reason.

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  • Posted on May 14, 2009
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Try a ground lift on the audio desk Im guessin it phase issue
ground lift is a small grey or orange 2 prong mail and 3 prong female any hardware store will have them...FYI

  • Anonymous May 14, 2009

    Ok well I have been in live sound reinforcement for more then 25 years I will promise you there is not an electrical issue here....unless of course your mixing in a pool of water...some times if the 2 units dont use the same National Electrical Code (NEC) you get a cycling difference which will cause electrical frequency noise or HUM in the system by taking the ground on the desk out of the loop you take away the electrical "tail" if you will and should stop the buz....every sound company in the world that plugs in $100,000 audio counsels have at leat 3-4 of those ground lifts near there desks...cuz in our biz you CANT have a buzz at 150,000 dBs...and if you dont want to trust me call a local sound CO...in you town and ask some one in the audio department...good luck

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