MAXIM has a chip that will switch audio and video. I don't remember the part number but a company called NCD www.controlanything.com or www.controleverything.com you may also try ncdryan@aol.com. He is the designer of the circuits. If you can't find the infor, contact me offline and I will see if I can get it for you, as I have the sheets here just not at this desk Eddie, kc4awz -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.