Hiya!

I want to build a 3-channel stereo audio mixer and actually embed it in retropcs so I can regulate the audio levels of the various sound devices inside. I know of external mixers but I don't really like them as they take precious space. Already have one and it does not suit my available space... 😖

Here is (another irrelevant device) that looks like what I want to find:

3 stereo input and one output, each controller with a potentiometer , something like that can easily be mounted on a 5.25" faceplate for example.

Does anyone here knows of a kit / complete mixer or lastly a good schematic to build one? A kit is preferable but I couldn't find anything on eBay... 😕

Any help on this will be greatly appreciated, thanks!