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Old 1st August 2004, 10:52 PM   #1
G is offline G  United States
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Default Multi chassis grounding scheme.

Hi All. I was told once upon a time that you needed to use a "buffer" between safety ground and signal earth to keep the mains noise out of your music. I have made a diagram below as a reference for this thread. Take a look and tell me what you think. I am going to be building a two box preamp and I wanted to get the parts list down so I can see how much the financial damage is going to be. I'm not sure that I need to connect signal earth to safety ground in the circuit chassis. What do you think?
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Old 2nd August 2004, 01:24 AM   #2
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Mains noise, shmains noise. Y'all are paranoid. Ground loop, now there's an actual concern from that scraggly old wire.

Tim
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Old 2nd August 2004, 03:01 AM   #3
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Quote:
Originally posted by Sch3mat1c
Mains noise, shmains noise. Y'all are paranoid. Ground loop, now there's an actual concern from that scraggly old wire.

Tim
Thanks Tim. That was helpful.
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Old 2nd August 2004, 03:21 AM   #4
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Hi,

Don't know wheter this would work O.K. in the U.S. but this arrangement is one of the possibilities that seem to work fine this side of the pond:

Cheers,
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Old 2nd August 2004, 03:28 AM   #5
jlsem is offline jlsem  United States
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Quote:
I have made a diagram below as a reference for this thread.
Is chassis one the power supply chassis and chassis two the amplifier chassis? (from Frank's diagram)

John
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Old 2nd August 2004, 03:31 AM   #6
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Hi,

Quote:
Is chassis one the power supply chassis and chassis two the amplifier chassis?
I'm the one responsible for numbering them....
So, yes, to me at least they are.

Cheers,
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Old 2nd August 2004, 10:34 AM   #7
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Thanks Frank. Hopefully the electrons won't be geographically aware.
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Old 4th November 2008, 08:13 PM   #8
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If I understand this correctly, the signal ground of chassis 2 is not connected to chassis ground at all?
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Old 4th November 2008, 09:16 PM   #9
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Quote:
Originally posted by Luke
If I understand this correctly, the signal ground of chassis 2 is not connected to chassis ground at all?
Wow, talking about digging up an old post! If you mean Frank's diagram then yes, he is recommending that in the audio circuit chassis, there is no connection from signal ground to chassis, and that this connection only be made in the power supply chassis.
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Old 5th November 2008, 12:50 AM   #10
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Thanks Leadbelly,

yeah I know its an oldie but these issues allways crop up:-)
Ive got something like this and I cant get rid of the hum, Im going to redo the grounding as per this schema and see what happens.
Im terrible with grounding, I allways use star grounds but I think I need to put a bit more thought into it before wiring.
thanks!
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