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Old 15th November 2007, 12:30 AM   #1
EE is offline EE  Germany
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Default Connection of input shield?

Hi,

I'm building a power amplifier kit (Thel).

It has two separate amplifier assemblies on their respective heatsinks and a common PSU board. The star ground is between the main capacitors. The amplifier assemblies each have a groundplane where all the small decoupling capacitors are connected and also the input low pass filter capacitors. There are two ground connectors on the amplifier PCB's, one near the power rails and one where you connect the signal input.

Now I'm asking myself how to route the signal wire from the XLR jacks. Do I connect the shield to the ground pin of the input connector on the amp PCB or do I connect it to star ground? Or both? Obviously best would be to route every single ground connection separately to the star ground, but this is not possible because of the amp PCB's ground plane.

Thanks!
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Old 15th November 2007, 10:14 PM   #2
gni is offline gni  United States
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First of all. . .this sounds like a balanced input using XLR connectors.

I would be inclined to attach the shield ground at the input of
the amp only. . . so as to be far from the larger currents associated
with the star ground point. I would not split it and also run the
ground to a second location. . .loop!

Not knowing the schematic I couldn't say for certain. . why don't you
upload a schematic of the circuit in question and maybe a picture of
the assembly process. . .
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Old 17th November 2007, 09:35 AM   #3
Gordy is offline Gordy  United Kingdom
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This is not a direct answer, however regarding earth / ground connections please refer to the links that I posted in this thread: http://www.diyaudio.com/forums/show...threadid=111847
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