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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

Hello,

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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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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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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