Electrical noise on my non grounded laptop's microphone

[DiogoVala]

Hi all.
I live in an old house and the power outlets don't have ground.
The microphone presents a hum sound when the computer is connected to the power outlet, but it goes away when it's running on battery.
I have been researching a lot about this and found out you can fix this noise on your audio devices by using a "Hum Destroyer" (MICROHD HD400), but they only say it fixes ground loops. I am unsure that this is the problem I have, since I have no grounding whatsoever, but I'd like to know if something like this could fix my problem or if the only solution is rewiring the outlets.

Thanks all!

 

[soundguruman]

Hi all.
I live in an old house and the power outlets don't have ground.
The microphone presents a hum sound when the computer is connected to the power outlet, but it goes away when it's running on battery.
I have been researching a lot about this and found out you can fix this noise on your audio devices by using a "Hum Destroyer" (MICROHD HD400), but they only say it fixes ground loops. I am unsure that this is the problem I have, since I have no grounding whatsoever, but I'd like to know if something like this could fix my problem or if the only solution is rewiring the outlets.

Thanks all!

Disconnect Cable TV / Cable internet completely.
Did the HUM go away?
Use a Cable TV isolation transformer...isolate the entire house, where the cable enters.

Better Power Supply for the computer. Cheap power supplies are VERY noisy.