I am working on an A/V switch with the kids and was annoyed by the fact that the page talking about how to do that did not include anything like a schema (it has some bus drawing... who cares?!) This being said, the concept is perfect and works just fine. It's just hard for me to see that when the person just says connect this here and that there and voilà!

Original A/V switch information:

https://www.engadget.com/2007-03-13-how-to-make-a-solid-state-a-v-switcher.html

The source is a gschem file as created by gEDA Schematic Editor (a free tool you can get on Ubuntu.) Already the free version is fantastic. You can also get a license. Not too sure what that adds, but this existing free version is a lot more than what I need for what I do in electronics which is close to nothing.

There is a small version of the image, click on it for the large version. The attachment below is the original.