Michael: ... > Jacks have a TS, or TRS, TRRS, or TRRRS contacts arrangement, depending on > the > connectivity they are meant to offer - mono, stereo, stereo+mic and whether > this is balanced or unbalanced. ...
I have an old laptop (Thinkpad T61p [1]) with a stereo and microphone jack, both 3.5mm. How do one know if it is a TRS or TRRS variant without opening the case ? Maybe it is a trrs jack since when I inserts a trs cable (to speaker) the ouput sound whines a lot, mostly masking the intended sound. I found some specs in [2] and [3]. Regards, /Karl Hammar [1] https://www.thinkwiki.org/wiki/Category:T61p [2] https://www.headphonesty.com/2019/04/headphone-jacks-plugs-explained/ [3] https://en.wikipedia.org/wiki/Phone_connector_(audio)
