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Class D Switching Power Amplifiers and Power D/A conversion

Lepai 2020 - moved potentiometers off board with wires, getting interference
Lepai 2020 - moved potentiometers off board with wires, getting interference
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Old 14th January 2018, 12:32 AM   #1
BMOC is offline BMOC
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Join Date: Jan 2018
Default Lepai 2020 - moved potentiometers off board with wires, getting interference

Hi Guys,

I apologise if this has been covered, I did search a lot but couldn't find much to address this issue.

I have a Lepai 2020 that I'm putting into a custom built unit. I have the amp mounted inside and I've taken the three pots off the board and mounted them in a control panel on the unit (see attached image). Everything works, but I get serious interference unless I push the tone button to bypass the bass/trebel pots. If I hold the new control panel in my hand, I get no interference (presumably because this grounds everything).

I'm not overly knowledgeable when it comes to electronics. I thought that maybe because the volume knob appears to be grounded (extra wire from outside of pot to board) that maybe if I did the same with the other pots that might eliminate it? But when I connected some wires between those pots and the same ground point for the volume point it did nothing.

Any suggestions? Should I have used shielded wires? Can I add shielding to the bundles of wires? Is there another way I can ground this without added a bit chunk of metal to the stereo?
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