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understanding star grounding
understanding star grounding
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Old 26th March 2020, 09:07 AM   #671
Mark Whitney is offline Mark Whitney  Netherlands
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You are building three mono amps in one chassis.
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Old 26th March 2020, 09:39 AM   #672
Bensen is offline Bensen  Belgium
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understanding star grounding
Almost:
- 2x mono preamp (buffer)
- 1x transformer for all other circuits: input selection, volume control...

This preamp will drive two monoblocks.2nd amp from scratch: Low NFB- FET front end - BJT OPS
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Old 26th March 2020, 11:17 AM   #673
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by Bensen View Post
Is the way I routed the gnd lines correct? All to start ground, made between 0V's of the two PSU's for the buffers?
What you are calling gnd lines are signal returns and should be close coupled with signal flow (ie use coax) and go directly back to where they originated
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Old 26th March 2020, 12:49 PM   #674
Speedskater is offline Speedskater  United States
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Forget the Star idea.
Each DC supply common (aka ground) should attach to it's audio circuit common (aka ground) and both commons should attach to the chassis at a single point near that circuit's input connectors.
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Old 26th March 2020, 05:29 PM   #675
Bensen is offline Bensen  Belgium
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understanding star grounding
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Originally Posted by Speedskater View Post
Forget the Star idea.
Each DC supply common (aka ground) should attach to it's audio circuit common (aka ground) and both commons should attach to the chassis at a single point near that circuit's input connectors.
Thanks for the valuable input. I've changed the scheme.
This is as good as identical as I have done inside my monoblocks.

Any comments?
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Old 26th March 2020, 05:47 PM   #676
David Davenport is offline David Davenport  United States
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I would route the grounds a little differently.

Do not connect the power common of each supply to the common ground buss. Rather, connect the common of each supply to the common of its load circuit.

Then connect the common of each load circuit to the common ground buss as you have shown.

This will keep the return currents from unnecessarily mixing, while still providing a common voltage reference for the circuits.
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Old 26th March 2020, 05:51 PM   #677
David Davenport is offline David Davenport  United States
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Sorry for my late post - I see that you got it right.
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Old 26th March 2020, 08:20 PM   #678
Bensen is offline Bensen  Belgium
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understanding star grounding
I've done some cleanup and decided to not use the same PSU for the muses 72320, logic and input selection. So I added an extra xfmr.


Each PSU goes to his load.
There is 1 audio ground start point. From wich one gnd cable leaves for all input RCA's and 1 for the two output RCA's to avoid ground loops whitin the preamp enclosure when for example a source is connected.

I'm wondering what to do with the earth loop ground breaker. It's now connected to the common of the input selection PSU? Any good?
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Old 26th March 2020, 09:33 PM   #679
Mark Whitney is offline Mark Whitney  Netherlands
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Grounding sheme.jpg

Something like this. Green is coax, all power are twisted triplets.

If you can design the switching and MUSES as two independent channels, even better.
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Old 26th March 2020, 10:06 PM   #680
Bensen is offline Bensen  Belgium
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understanding star grounding
Ok,
I will have the Muses before the buffers.
What do you mean with HBR, written on the buffers?
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