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Old 19th May 2005, 01:51 AM   #1
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Default Carlos grounding Scheme

In an earlier post by Carlos he showed some pictures of a grounding scheme he was using with some BrianGT boards. However I can't seem to find it even though I searched for it. Aslo I'm not sure I completely understood it. Is the attached picture an accurate depiction of waht Carlos was suggesting?
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Old 19th May 2005, 03:47 AM   #2
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It's been posted here: http://www.diyaudio.com/forums/showt...246#post617246 and it works well, especially with LM4780 boards powered from a common supply.
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Old 19th May 2005, 06:54 PM   #3
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Default Re: Carlos grounding Scheme

Quote:
Originally posted by kestrel200
Is the attached picture an accurate depiction of waht Carlos was suggesting?
Yes, sorta.
Corrected.
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Old 19th May 2005, 07:42 PM   #4
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Default Re: Re: Carlos grounding Scheme

Quote:
Originally posted by carlosfm


Yes, sorta.
Corrected.

Thanks Carlos!!!!! It's clear now! I was confused about the what you did with the extra pair of the power supply's PG+ & PG- but I see you just leave them empty.


Thx again!
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Old 19th May 2005, 08:37 PM   #5
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By this method of grounding exist theoreticaly little crosstalk between channels, 'cos any ground wire have zero resistance.
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Old 19th May 2005, 11:22 PM   #6
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Quote:
Originally posted by Peter Daniel
It's been posted here: http://www.diyaudio.com/forums/showt...246#post617246 and it works well, especially with LM4780 boards powered from a common supply.
I guess this is a question for Carlos -- what is the wire you use for the ground wires. I see that it is thick copper, but is it just stripped solid core wire, or is there some other source for it?

-d
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Old 20th May 2005, 08:29 AM   #7
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Quote:
Originally posted by Upupa Epops
By this method of grounding exist theoreticaly little crosstalk between channels, 'cos any ground wire have zero resistance.
I do not understand. You probably mean that no ground wire has zero impedance.
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Old 20th May 2005, 09:25 AM   #8
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Yes - you know my english .
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Old 20th May 2005, 06:33 PM   #9
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Quote:
Originally posted by dsavitsk
I guess this is a question for Carlos -- what is the wire you use for the ground wires. I see that it is thick copper, but is it just stripped solid core wire, or is there some other source for it?
On the chip boards you can fit 1.5mm solid core copper.
Get those boards close from each other.
Then use a thick solid core wire (1.5~2.5mm) to join the two boards.
Coming from the PSU to the center of that wire I use multi-strand 2.5mm copper.

This is all normal electrical wire, no need to get fancy.
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Old 20th May 2005, 06:41 PM   #10
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Quote:
Originally posted by Upupa Epops
By this method of grounding exist theoreticaly little crosstalk between channels, 'cos any ground wire have zero resistance.
Nothing to worry about.
Yes, it's a common PSU for two channels.
Even then, it's still better than using a single LM4780 chip for stereo.

It is also the way to make a silent amp, no hum.
I have been explaining this for years... glad that someone had the brilliant idea to make a sketch.

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