How can i connect my karaoke mixer with 3.5mm output jack to the soundbar without audio input port?

[pei_rong_01]

I only have a HDMI, optical (TV) input and USB port for my soundbar. Already connected the HDMI to the TV. How can i connect my karaoke mixer with 3.5mm output jack to the soundbar?

 

[Alabalcho]

You can get analog to optical audio converter for like $20 on popular e- shopping sites.