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How do I remove power supply buzz/static?

Engaged ,
May 31, 2018 May 31, 2018

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Im doing some recording on my laptop but anytime I have the power/ac adapter plugged into the unit, the recording gets what I consider to be a high pitched, not so faint, static/buzz.

I went through Jason Levines video about removing noises, and tried all the different techniques, but the results either kill the sound completely and makes my voice sound muffled/covered, or the sound is still there.

When I unplug the power cable from laptop and record, there's no buzz while recording. The buzz is not from external/ambient/environment, but from within the computer. like static feedback or something.

How can I fix this??

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Community Expert ,
May 31, 2018 May 31, 2018

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We haven't heard so much about this recently, but it's a well-known side effect of using a switch-mode power supply which isn't earthed, and usually manifests itself when another device is plugged into the laptop as well as the power supply. What happens is that a load of static 'hash' from the (essentially floating) power supply gets capacitively coupled into the laptop supply and ends up as what we know as 'common mode' noise. You can read a bit more about it, and also look at a few potential solutions here: Humming and buzzing noise from laptop when used with AC adapter - ERG Blog

(Apparently the link is dead now)

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New Here ,
Jun 08, 2020 Jun 08, 2020

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I wasn't able to access the link with the solutions. I got a 404 error. The static is a recent problem for me and happens when I boot the laptop, save a document, try to listen to anything with audio and even makes the static sound when the speakers are off. It started at the same time as Adobe updates. Any thoughts?

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Community Expert ,
Jun 08, 2020 Jun 08, 2020

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Try starting a new thread, and if you can post a file of the noise, then it will be easier to identify.

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