4 channel video mux for robotics project

Hi Carl,

I don't have any experience with this module, but I did build a very simple
video multiplexer myself. It really depends on your requirements, but if the
only thing you require is the functionality of a switch between multiple
video sources, without the need to synchronize line & field sync etc. then
you might be able to use the same circuit as I used. It consists of emitter
followers, one per video source, with their outputs wired together. The
inputs are AC coupled to the video sources, and the DC level is controlled
through a resistor from digital control lines. There should be only digital
control high, which results in that video being transfered to the output.
The other emitter followers will have their base-emitter junction reverse
biased and are therefore reasonably well isolated. Not a high-performance
solution, and I didn't even measure the isolation, but judging from the
picture it should be at least 50dB.

I hope this explanation makes sense. If it doesn't, but you are interested
in the circuit, please let me know and I will try to give a better
explanation and/or send you a schematic. Good luck with your project!

Best regards,

   Peter