Thanks, Peter ... sorry for the long delay in replying.

Tech Square

Technical and speculative discussion of amps, cables and other topics.

In Reply to: One more input (even though it's a month late) posted by Commuteman on December 16, 2004 at 17:16:24:

For some reason I didn't get an email alert on your post?? And I don't haunt TechSquared like I do some of the other AA Forums!
Can you just provide a bit more explanation for me, for what you said?
You said: "As far as the power and signal connections, Victor has given you a great way to think about it. For example, look at the power supply circuit, and think about charging currents for the power supply caps:
* Power rail caps are there to smooth the power rails and to shunt noise to ground.
* Large PS caps are there to help smooth the AC signal from the transformer and rectifiers.
Do you want those capacitor charging currents flowing along the same ground trace that you use to connect (say) a feedback network to ground?"
ABSOLUTELY NOT!!
"Probably not, since the PS currents would cause voltages in the ground traces that could be interpreted as signals, and show up as added noise.
You may want all of those currents to return to a single ground reference point, but you don't want them interacting with one another or creating spurious signals. Hence the star ground concept."
OK, as an ex-"Naimie" ... I understand the "goodness" of the star ground. However, instead of just one star ground, maybe I could organise the traces for the:
* power rail caps' earth connections and the PS filter caps' earth connections to go back to one star earth, and
* signal/feedback earth connections to go to another star earth ... which has a 10ohm res between it and the PS cap star earth?
This, to my "simple" way of looking at things (not having a theoretical electronics background) would separate signal earth from power supply earth? But would it do any bloody good??
Regards,
Andy

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Follow Ups Full Thread

Topic - Seeking advice on qu re. separation of earths in an audio circuit? (long) - andyr 17:24:02 11/03/04 (5)

One more input (even though it's a month late) - Commuteman 17:16:24 12/16/04 (1)

Thanks, Peter ... sorry for the long delay in replying. - andyr 00:15:55 02/01/05 (0)

Re: Seeking advice on qu re. separation of earths in an audio circuit? (long) - Indrid 11:34:31 11/10/04 (0)

Re: Seeking advice on qu re. separation of earths in an audio circuit? (long) - Victor Khomenko 13:08:39 11/05/04 (1)

Thanks, Victor (nt) - andyr 14:43:34 11/05/04 (0)

Follow Ups

Thanks, Peter ... sorry for the long delay in replying. - andyr 00:15:55 02/01/05 (0)

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