I am trying to do a little repair on a semi-complex system that contains a circuit board. I won't bore you with the details, but the bottom line is I have to wire in a 24Vdc supply in. I got myself a cheap 24Vdc 1A adapter (which is what is called for), from which I'll have to strip the barrel connector and test the wires for polarity. But I'm pretty green and I'm afeerd of getting the polarity wrong when I hook it up and blowing up the whole circuit board that is being supplied. My plan is to put an LED (or two) in between my adapter and the connection(s) to the circuit board before I plug it in to test it. Do you think that the diode will pop the connection before any damage is done to the PCB and that it will protect me? Or is there not enough information to tell? Or is there a better plan (besides "just be sure to test correctly for polarity")?
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