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Old 4th Dec 2022, 1:38 pm   #10
Chrispy57
Hexode
 
Join Date: Mar 2020
Location: Rochdale, Greater Manchester, UK.
Posts: 439
Default Re: Noise issue with DIY variable PSU and audio amplifier

To test this theory you could just try connecting up an earth lead, perhaps from another mains plug solely wired with an earth lead and plugged into the adjacent double-socket outlet, connected to the 0V of your PSU rather than hack the case unnecessarily?
Good luck
Chris
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