Good evening fellow electro experts,
please bear with me. My knowledge about circuits is somewhat basic.
I've recently set up an audio chain from the speaker/mic combi jack of my notebook to the line-in jack of my PC. This way, I got the notebook sound on the headset connected to the PC.
The setup was working fine until I decided to plug an monitor to the notebook (in addition to the integrated one). Unfortunately, I hear an annoying electrical noise/interference whenever hold the HDMI cable of the monitor to any port of my notebook. Not just the HDMI port either, any port.
According to my research, I might have created a ground loop but I've no idea how to fix it.
The overall setup is like this:
One outlet, one outlet strip (kind of hanging from the desk atm), PC (under desk), Notebook (on desk), PC monitor (on desk), notebook monitor (wall mounted) and a simple ethernet switch (under desk) are connected to the outlet strip. In addition to that, notebook and PC are both cable connected to the switch. Notebook audio jack / PC line-in jack are connected with a male-to-male 3.5mm cable.
Unplugging the notebook from the outlet strip and from the switch didn't make any difference.