disturbance

Hey Guys. I'm a total noob, but I'm happy to be here. Just got a HyperX QuadCast microphone, and I am trying to stream my iPad Pro. However when I set it up in OBS, especially when I connect the iPad there is a subtle electric disturbing sound going on... It even shows on the equaliser...

I am using OBS studio on windows and it work fine for me. Nowadays I am trying to use it on my linux machine. It's recording video but some disturbance are also coming in video. Can someone tell me what I am doing wrong. I am trying to solve it from hour(s). Thanks in advance for help.