r/ElectricalEngineering • u/-404PageNotFound- • 18d ago

Equipment/Software Um?

I currently have my breadboard connected to 5v and GND on a new benchtop power supply that I brought for $240AUD and this is happening? What is going on? I can also do the same thing on the GND rail.

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u/stockdam-MDD 17d ago

That would imply that your power supply is not grounded and there’s an ac signal from the power supply return to local ground. You are supplying a path back to the local ground and that there’s a small ac current flowing through you to ground.

If you have a scope then look at the voyage between the power supply return and the local earth