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Laptop electricity, buzz noise from mic & touching it


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6 replies to this topic

#1 chestnutjam

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Posted 08 January 2017 - 01:02 PM

I've had this phenomenon ever since I got the laptop.

 

 

If my laptop is plugged in and I record audio from the mic, the background noise is huge. If I unplug the laptop, the noise reduces a lot. However, if I touch the laptop with my bare skin, the noise becomes significanly more quiet in both cases.

 

Is it because my sockets don't have a grounding? Does it affect me since (i'm assuming) elecricity conducts to my body? Is there a way to drain the leakage so that I can release my hands from the laptop and make gestures while recording myself speak?



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#2 dc3

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Posted 08 January 2017 - 01:19 PM

What is the make and model of this laptop?

 

What type of microphone are you using?


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#3 mjd420nova

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Posted 08 January 2017 - 07:03 PM

Ungrounded outlets/devices can create the fault you're hearing. 



#4 chestnutjam

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Posted 09 January 2017 - 12:35 PM

What is the make and model of this laptop?

 

What type of microphone are you using?

Lenovo G780 with a SVEN AP-640 headset. Need to know stuff before I get myself a condenser. Stuff seems whack here.

 

Ungrounded outlets/devices can create the fault you're hearing. 

I've been looking up and trying to figure out how them sockets work. Is it possible to just replace a C outlet with an F for it to function? Or does a building need a grounding system or whatever there is?


Edited by chestnutjam, 09 January 2017 - 12:38 PM.


#5 dc3

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Posted 09 January 2017 - 12:59 PM

The laptop has a power adapter which rectifies the voltage from AC to DC.  The plug used for the AC side of the power adapter is a three prong plug, so the line voltage supplied is grounded to the adapter, but the output is not.  For this reason the laptop actually is not grounded through the circuit.


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#6 chestnutjam

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Posted 09 January 2017 - 02:56 PM

The laptop has a power adapter which rectifies the voltage from AC to DC.  The plug used for the AC side of the power adapter is a three prong plug, so the line voltage supplied is grounded to the adapter, but the output is not.  For this reason the laptop actually is not grounded through the circuit.

 

A three prong plug? This is what my laptop has:

inline-typ-f-german----mikey-mouse--lapt

 

And this is the kind of a socket this apartment has:

electricity-type-C-socket-292x300.jpg

 

I don't really understand much of what you said, but I'm assuming you meant that excess electricity wouldn't be grounded beyond the power adapter? Will such knowledge help me get rid of the buzz?



#7 dc3

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Posted 10 January 2017 - 11:31 AM

Obviously you are not a resident of the U.S., that plug is for a 230V line voltage.  

 

Is this computer still under warranty?


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