[sdiy] Why dual grounds?

[Veronica Merryfield]

clean and dirty
power and signal

Probably trying to keep the CV signal clean.

Double check that there isn't a decoupled, artificial or some other synthesised ground and a real ground. 


On 2010-06-08, at 5:17 PM, David Ingebretsen wrote:

> Still working on this Steiner Synthasystem project...
> 
> I noticed on the keyboard schematic, Nyle very clearly uses 2 grounds. For
> the life of me I don't see why. 
> 
> In general, why would one want two grounds in a circuit that is not a mix of
> analog/digital and is not outputting signals for audio, just CVs?
> 
> Where and how would these two signals come back together. His power supply
> is "nothing special", so to speak. Just one ground from the center-tapped
> transformer, but he clearly runs these ground signals back to the power
> supply somewhere.
> 
> No other module has two separate grounds.
> 
> So, why two grounds on this, but no other module?
> 
> I know you need to see the schematic, but I can't publish the thing. :(
> 
> David
> 
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