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Old 8th January 2013, 03:11 AM   #1
BRSHiFi is offline BRSHiFi  United States
Previously known as kingden
Join Date: Aug 2008
Location: Evanston, IL
Default Preamp Grounding PCB


I am building a preamp entirely on a PCB. I am considering 4 layers with a ground plane if I can get a good deal, but likely will use 2 layers with the ground layer on the bottom. The ground plane will be one huge copper pour that everything grounded runs to, as is typically found in most PCB designs. I never tried this, always star grounding. In my mind, since the copper pour is huge, it will keep potentials between grounds to a minimum. Am I right? Is this ground plane a good idea or am I asking for ground loop trouble somehow by doing this?

There will be no digital parts in this circuit, only analog.
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Old 8th January 2013, 06:01 AM   #2
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Join Date: Feb 2010
I have done RIAA amplifier with two layers PCB and grounded it from one point only ( to chassis). It is practically hum free.
The heater voltages are DC.

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Old 8th January 2013, 09:18 AM   #3
DF96 is offline DF96  England
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Join Date: May 2007
Try it. If it works, fine. If not, you will have to start cutting slots in the ground plane to make the currents go where you want them to.
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