If the supply is isolated from Earth and all you are worried about is a short circuit across the output, all you need is some sort of current limit built into the output, because a short between either side of the output signal and Earth would close no circuit.
I have a project in the design phase that I need a bit of advice on.
The project has two circuit stages both powered from the same power supply:
The project has a high potential for short circuit across the output, so I am planning to use a fast optocoupler to provide some isolation on the bit stream line to protect the microcontroller from feedback spikes. But can't a spike feedback through the shared ground as well? How do I go about isolating the ground between the two stages while feeding them from the same power supply. My only idea from my very few years of electronics is an isolation transformer. Any other ideas or am I going at this from the wrong direction. Thank you and Merry Christmas!
Steve
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