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Old 5th January 2012, 10:31 PM   #31
GLooP is offline GLooP  Bulgaria
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Join Date: May 2011
Yes, you are right. I forgot to remove it on the board layout since this is the way the perfoboard comes. This is quite in harmony with my nickname, isn't it? But I think in this case it's more of a closed contour issue than a groundloop
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Old 5th January 2012, 10:43 PM   #32
sgrossklass is offline sgrossklass  Germany
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It definitely constitutes a ground loop, assuming the actual PCB also looks like that. (It's all topology.) You may pick up all kinds of hum and RF that way. Now the board isn't terribly big and the trace is rather wide, so I wouldn't expect all too many bad things happening now.

Still, you'd probably be getting a small (maybe not audible, but measurable) improvement essentially for free.
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Old 6th January 2012, 12:04 AM   #33
Cafofo is offline Cafofo
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I was thinking in build an SDS Lab version... but with an out power Source. Not at the same board as most of schematics... what you guys think?
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Old 6th January 2012, 07:16 AM   #34
GLooP is offline GLooP  Bulgaria
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Join Date: May 2011
Quote:
Originally Posted by sgrossklass View Post
It definitely constitutes a ground loop, assuming the actual PCB also looks like that. (It's all topology.) You may pick up all kinds of hum and RF that way. Now the board isn't terribly big and the trace is rather wide, so I wouldn't expect all too many bad things happening now.
Yes, I know that, I totally forgot to fix it at the end. Board is not in me currently, but I'll check it when it is back and I'll probably try to cut the trace between the output jack and the pot. Still cannot imagine what could drive any current in this exact board to have any reasonable ground loop issue. By the way - it is dead silent, no hum/RF. Go figure. Doesn't matter, it's only purpose was to check out A47 topology.

Quote:
Originally Posted by Cafofo View Post
I was thinking in build an SDS Lab version... but with an out power Source. Not at the same board as most of schematics... what you guys think?
That you need a good PSU. I hope I'll build one myself soon.
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