Audio input for 2018 Mac mini
I need to record from a turntable that has its output as a 3.5 mm plug. How can I connect it to my 2018 Mac mini so that I can record the songs from a vintage LP? Supposedly, the headphone output jack can act as an input jack, but when I plug directly into it, it doesn't show up on the list of input devices. One piece of advice says in order for the headphone jack to act as an input jack, you have to have a headphone with an attached microphone. I don't have that.
As an alternative, is there an adapter that will convert my 3.5 plug to a USB or USB-C that will input to my Mac mini? I got one for USB-C, but it must only work the other way, taking audio from the Mac mini to an external speaker.