[sdiy] Signals leaking into the PSU?

[brianw]

As a public service announcement, I would like to stress that the "wall socket ground" is for safety. It should never affect the signal noise, and circuit designers should never create anything that ties signal to the wall socket ground. I'm talking about the third pin on three-prong wall sockets.

I looked at the page in the provided link, which is a huge text, and found that it references Bill Whitlock and his papers on signals, grounding, and safety. I stress that folks should read Bill Whitlock's papers before designing anything that connects to wall socket ground.

Brian Willoughby


On Feb 19, 2023, at 8:45 AM, Peter Knoot wrote:
> This is actually quite a common issue.  The advice given so far is sound; bypass capacitors are certainly a must, but not sufficient solution.  A comprehensive approach must be taken for any Eurorack case (which tends to be far noisier than standalone equipment) to become noise-free.
>  
> Proper filtering requires a good, low impedance ground path.  This includes the module circuitry (proper PCB layout practices), power distribution bus boards, power supply and of course the wall socket ground!  Many folks don't even consider the latter.
>  
> Here's a great white paper by Genus Modu to give you some idea:
>  
> http://www.genusmodu.com/products/libb-wp-01.html
>