jhm731;143439 Wrote: 
> The TacT RCS's digital inputs are isolated from the unit's ground plane
> by pulse transformers. The analog inputs are connected to the ground
> plane. My guess is connecting the SB's analog outputs to the TacT
> allows noise from the SB to be shunted
> to the RCS's filtered ground plane.

Yes, if the input transformers input winding is just floating, then the
common reference point will be totally dependent on a path trough two
power supplies (or at least the grounding bypass), power filtering (or
its grounding bypass) and various connectors. I can imagine all sorts
of junk riding this path, and causing "hell" for the input transformer.
Bringing together the ground planes more directly would give the input
transformer a fair chance of doing its job the way it was meant to.

I'm still gobsmacked. I wonder how many other DACs would benefit in the
same way by a direct short grounding path to establish a common ground
(!).


-- 
P Floding
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