Passive Four Input YUV (Component Video Switcher)
These things can cost a lot of money, especially for an all singing all dancing fully buffered gain compensated matrix switcher. This version I put together for a mate of mine is neither new or special but does the job without issue even with progressive video sources.
The system is literally nothing more than a good quality aluminium project box, a three pole 4 way, wafer switch, standard small gauge hook up cable, 12 RCAs, three BNCs and a D15 connector. Each of the three poles on the switch is used, one for Red, one for Green and one for Blue. As the switch is turned one or other of the four sets of RCAs are connected to the BNC and D15 outputs. The D15 and the BNCs cannot be connected to equipment simultaneously.
You will note that there is no screened cable inside the box. The case is completed formed from ally and as such makes excellent shielding. All the connectors are grounded to the case. The switcher can be built for as little as £10 if you use screened cable and a cheap plastic box and cheap connectors. I opted to use high quality RCAs and BNC block. Total including paint was £25.
Put it together as per the diagram and mount as you see fit in a good quality metal box, then decorate as only an XBOX modder can.