[sdiy] Signals leaking into the PSU?

[Mike Bryant]

From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Neil Johnson via Synth-diy <synth-diy at synth-diy.org>

> There is a veritable treasure trove of design knowledge in the form of
> analogue mixing desk schematics and service manuals.  Hundreds of
> them, from Mackie, AHB, Soundcraft, Neve, SSL, Studer, DDA, and so on.

True.  But one problem is over the years various techniques come and go.  The best solutions invariably involve a large lump of metal along the whole length of the mixer with each separate card connected to it with a very short and very beefy wire.  But that left the perennial "do we connect the front panel of the card to signal ground on the module or leave it floating and have it grounded by screwing it into the frame."    And how do you connect grounds on two part modules with a cable to a rear panel ?

Similarly on smaller mixers do you use the case as the 'lump of metal' or try to route some sort of star grounding on the PCB(s) ?  Or just ground plane the whole PCB and use that for signals as well as EMI shielding ?  And then digital mixers came along which muddied things even more :-)

There are very differing views on all of this from some very famous names so I won't say what my preferences were.

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