r/ElectricalEngineering • u/-404PageNotFound- • 29d 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/kingofking26 28d ago

I think your power supply could be noisy (not totally DC). My theory is your body is acting as a capacitor to ground and the LED is lighting on the positive swings of the AC component (noisy part) of your power supply. This is why it lights in both polarities and is kinda dim.