RnFR wrote:is that bad practice?
This I don't really know (no expert either!
), but I'd rather avoid it. It might be more important in higher gain and higher power stuff (like amps)...
the ground is running everywhere the pour is, it's not like it's running down wires.
It is to me... Look at the righthand side 10k resistor shown on your PCB above: it's connected to ground. Now look at the 1M one, lefthand side. It's grounded too. But there are actually two path to go from one resistor to the other (on top of your ground loop, or on the bottom). Not really star-groundesque, right? Opening it somehow would solve this. I remember Francisco Pena from tonepad doing so...
I think the danger of grounding problems and ground loops in effects is sometimes overstated.. I certainly tie component ground points to the ground plane all the time.
For there to be a ground loop issue there must be a difference in potential between the grounding points.
I have to question whether there'd be any significant potential difference on the ground plane of a single and relatively small pcb..
As far as Star Grounding goes, I've always followed the advice of R.G.... this : "In PCB based effects, you generally don't have to resort to star grounding on the effect (as I mention in my book on PCB layout)."
and this:"... stompboxes are so small and have such small currents that
(a) the area of a ground loop is too small to pick up much radiation and
(b) the currents are so small compared to the conductivity of the grounds that you have little trouble."
I hope R.G. doesn't mind me quoting him on this.. or taking one comment out of a more complete explanation.
If he does, maybe he could leap in and explain it all better.