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Great topic!! -- one question

Dan:

This is indeed an important (and often overlooked) subject. It's very hard to find theory that can be applied consistently to real-word design problems.

One question:

The above forces the design to be star grounded at the return of the power supply, which is always good practice to reduce noise and ground loops.

Can you elaborate on what you meant by this? Are you saying that the design is forced in order to achieve lowest noise, or this is the only design that works if the audio ground is isolated from chassis ground?

Part of the reason I'm interested is that I am working on a preamp design that uses separate xformers for the two channels, and completely separate windings for each rail (i.e not a center-tapped bridge arrangement generating +ve and -ve voltages) with several stages of filtering.

In this case, it seems best to avoid a star ground at the supply, and instead reference everything to signal ground. I'm sure this sounds nuts, but it makes sense when you draw it....

Peter

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