I am having issues with multiple switchmode regulators powered by the same source causing interfefence on a VGA cable on an open-air PC. Electricity is flowing through the shield on the cable, causing interference.
Perhaps Dave could explain
1. What is a ground loop and what causes it?
2. How do you track down the cause and how do you fix it?
Currently I have had some luck by adding commonmode chokes to everything and jumping a seperate wire from one end of the VGA cable to the other so electricity follows its path instead of the shield, but I can still see noise on the analog driven screen.
What do you think? Should Dave do a video on ground loops?
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