why is there an electrical wine off certain devices but not others? And can it be fixed?

Question

Eta follow up question because curious:
I’ve always been told when a street lamp has a loud buzzing/droning that it’s a bad ballast. Were they talking about a part within the transformer?

In: 1

Answer 1

Cheap transformers. It’s almost always the power supply that does this. Capacitors can make some funky noises when they discharge tho.