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Old 17th March 2013, 12:05 AM   #1
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Default What to connect to earth ground?

If you have 3 pcbs in a single chassis, two amps and a power supply, do you need to connect all grounds to the earthed point in the chassis? Or can you only connect the power supply's ground to chassis?
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Old 17th March 2013, 12:23 AM   #2
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I would make a single signal ground node at the power supply and isolate it from the chassis (except for maybe some fairly high impedance connection for static drain) which should be connected to earth ground. This way the signal source can establish the ground reference for the active circuits with no current loops. Of course this means using the same isolating style connectors for the return side of the outputs as used for the "hot" side.

Last edited by Andrew Eckhardt; 17th March 2013 at 12:30 AM.
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Old 17th March 2013, 07:36 AM   #3
djk is offline djk
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I would consider using the bridge-rectifier ground disconnect method used by Bryston (and others). The left-hand bridge is the ground disconnect, the right-hand bridge is the DC blocker for a toroid transformer.

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Old 17th March 2013, 12:08 PM   #4
AndrewT is offline AndrewT  Scotland
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One connection from Chassis to Main Audio Ground. ONLY ONE.
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Old 17th March 2013, 12:33 PM   #5
Pano is offline Pano  United States
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Please see this excellent article by Dave Davenport in the diyAudio articles section:
Audio Component Grounding and Interconnection
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