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Audio Component Grounding and Interconnection
Audio Component Grounding and Interconnection
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Old 29th September 2010, 07:30 PM   #21
jcx is offline jcx  United States
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Safety Codes and consumer product Standards are not necessarily logically consistent

if Reinforced/Double insulated mains xfmr, internal wiring is followed there should be complete freedom in what to do with metallic cases and outlet protective earth

further in Intrinsically Safe circuit design which keeps chemical plants from exploding diodes used within their continuous ratings are only assumed to fail shorted - with 2 redundant paths 2 cross connected bridge rectifiers would be accepted in this much stricter safety standard as an "infallible" connection for safety analysis

Last edited by jcx; 29th September 2010 at 07:34 PM.
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Old 7th October 2011, 06:13 PM   #22
Skorpio is offline Skorpio  Denmark
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First of all: Thank you for a very good article!

I am planning a preamplifier based on the Figure 4.2-3 grounding layout. When unbalanced in- and outputs are used all their shields must be returned directly to the main star ground.

If all in- and outputs are placed close (8 RCA connectors isolated from chassis), could their grounds be interconnected with wire maling the main star? Or must each RCA ground be seperately wired to a common star point?
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Old 7th October 2011, 11:28 PM   #23
David Davenport is offline David Davenport  United States
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Hi Skorpio,

Think of two things: First is current loops and second is common impedance coupling.

For the inputs, you will have a loop between each input unit's chassis through the interconnect cable to the preamp chassis and back to the input unit chassis through the power cable. However, there will be signal current flowing in a loop when that input is selected. Therefore, since only one is selected at a time, you can share a connection between the input jack field and the main star ground.

There will be current flowing in the output grounds whenever there is music playing. You don't want to mix this output ground current with the input ground current by common impedance coupling, so the ground connection between the output jack and the main star ground should be separate from the ground connection between the input jacks and the main ground connection.

Dave
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Old 8th January 2012, 01:05 PM   #24
Skorpio is offline Skorpio  Denmark
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Hi again,

Since most of the chassis current origins from capacitive or magnetic coupling from the mains transformers, could it be an advantage to put all the mains transformers (except for power amp) in a common chassis, and by this holding the low level chassis free of these error/mains return currents?
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Old 9th January 2012, 04:37 PM   #25
David Davenport is offline David Davenport  United States
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Hi Skorpio,

While there may be a small improvement in shielding, I don't think it matters much from a practical matter.

The current in the chassis is not a problem for the signal assuming that there is no signal current in the chassis.

Dave
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Old 9th January 2012, 07:19 PM   #26
Skorpio is offline Skorpio  Denmark
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Thank you David!
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Old 17th March 2012, 07:45 PM   #27
krokkenoster is offline krokkenoster  South Africa
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Okay some of you guys have aqll the knowlege to criticise but I wish I had this article way back in 1964 when I seriously started to meddle with electronics. Remember them verydangerous AC/DC tube type equipment? I had some nasty shocks from them as our mains is 245 volts and this bites till I got an isolating transformer. battled with this same problems and had to battle for months on end as I was the only one to ask myself and the basics was to me unknown. I only solved problems by pure luck and was unable to work out for myself what went wong! Thanks for a super article.
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Old 19th March 2012, 10:44 AM   #28
SoNic_real_one is offline SoNic_real_one  United States
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Quote:
Second, use a shielded twisted pair for the interconnect cable, with one of the wires in the pair (as well as the shield) being the signal reference
Actually the correct solution IMO is the twisted pair inside a shielded cable, with the shield connected just to the source end star ground.
Any stray fields picked by the shield will be returned to ground, it doe snot create ground loops, all while signal ground does not pick any stray fields.
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Old 19th March 2012, 04:16 PM   #29
David Davenport is offline David Davenport  United States
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As I mention in the article, there is controversy on whether to connect the shield on one end or both ends, with compelling arguments for both approaches. I won't argue for one or the other, but vote for whichever works for you

Dave
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Old 24th March 2012, 08:46 AM   #30
SoNic_real_one is offline SoNic_real_one  United States
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Haha, I did. Some 28-30 years ago
Shield at one end. Twisted signal/ground inside.
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