Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "J" <wyninejr@...> wrote:

............  >Currently I am isolating the AC signal by having an 
analog 
> ground plane that is isolated from the digital ground plane.  There 
is 
> a common ground area in which both planes are connected by a path 
that 
> is at least .50 inches wide.  .......  >Any ideas on how to keep the 
> noise from traveling from the AC ground plane to the Digital ground 
> plane via the common ground area?  ........
>


Texas Instruments have numerous documents on PCB design on their site.
The following artical addresses keeping Analogue and Digital ground 
planes seperated, amongst other points. There could be an answer here.
http://focus.ti.com/lit/an/slyt166/slyt166.pdf