Came across this, and although we all (I assume) try and avoid reverse voltage, thought it maybe handy for someone here
https://www.youtube.com/watch?v=IrB-FPcv1Dc
https://www.youtube.com/watch?v=IrB-FPcv1Dc
Perfect timing! Thanks for posting that, I'm midway through building a circuit to trigger the shutter of up to 16 DSLR cameras at once through optocouplers, with the idea of building more identical boards that will link up and trigger up to 160 cameras at once. I was just going to use a simple diode as reverse polarity protection but this is much better as I'll be adding in an input voltage LED display.Came across this, and although we all (I assume) try and avoid reverse voltage, thought it maybe handy for someone here
https://www.youtube.com/watch?v=IrB-FPcv1Dc