How to get rid of extraneous noise when recording through a mic?

Question

Iron

Mac mini, which, as you know, does not have a microphone input, there is only a line input. I bought a noname USB zvukovuhu with plug and play for three hundred and a Dialog microphone for a hundred. The output from the sound system is rotten: without unnecessary noise and sounds, but there are no bottoms, so I left the headphones plugged into the mini-car itself. In general, the microphone works through the sound system, but when recording, there is a buzz, a sample is on the wall. Any suggestions on how to remove this sound?

Answer 1

Ground?

Answer 2

The problem is in the NONAME sound system, you need to remove it, and not the buzz from the track