Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Audio Component Grounding and Interconnection
Audio Component Grounding and Interconnection
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd April 2010, 01:35 AM   #11
David Davenport is offline David Davenport  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Raleigh North Carolina
Thank you for all of the kind comments. I am pleased that so many are receiving benefit from the article. Let me respond to a few of the comments.

Alan (waltzingbear) Good point on the panel and I will clarify that in a future update. Many knowledgeable engineers (some referenced in the article) object to switching power supplies, not because they can't be done well, but rather, because they haven't been done well in a lot of consumer equipment.

Omega_Void The point of that section is to say which ground each transformer frame should be connected to so noise is not introduced into another ground. You would definitely not want to connect the transformer frame to neutral.

Dave (zdavesf) You might have an easier time printing the version of the article on my website, which is a pdf. It is at http://www.raleighaudio.com/Audio%20...connection.pdf

Hi Fi Nut Nut I Have seen that back to back diode scheme used several places. I think (although I am not sure) that this scheme is not in compliance with the standards. I am not going to second-guess the standards so I don't even mention that scheme. However, I will say that in general, I believe all ground isolation schemes to be band-aids and should not be needed in a system with properly designed grounding.

Dave
  Reply With Quote
Old 28th April 2010, 12:38 PM   #12
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
Audio Component Grounding and Interconnection
An excellant article 10/10, a clear and consise synopsis of "grounding" issues, and references to EMC and the problems it causes. (I am a
strong supporter for banning data over powerlines etc.)
It would be interesting to take this further and discuss the various grounding schemes available for various PCB designs,
analogue, digital and mixed, and discuss thier advantages and disadvantages, and how EMC is becoming more of a problem and how it can combatted
and also avoid creating more EMC problems.
This is becoming more important IMO as more digital based electronics is becoming the norm in Audio repreduction, whether it is a SMPS, ADC/DAC, class D
etc, so things are becoming dirtier (electronicly) and PCB layout is becoming more critical, and allPCB's should be laid out from the ground up as it is the most important signal.
  Reply With Quote
Old 29th April 2010, 09:57 AM   #13
binspaul is offline binspaul  India
diyAudio Member
 
binspaul's Avatar
 
Join Date: Feb 2009
Location: Cochin, Kerala, India
Audio Component Grounding and Interconnection
Hi,

What an excellent article. Full of valuable informations. Thanks a lot.
  Reply With Quote
Old 30th April 2010, 10:23 AM   #14
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Thanks for the great article

BTW, there is a picture missing at:
Figure 3.5-4, Balanced to single-ended interconnection.
  Reply With Quote
Old 30th April 2010, 12:18 PM   #15
pooge is offline pooge  United States
diyAudio Member
 
Join Date: May 2003
Location: Northern Va.
One thing still puzzles me. Legal or not, isolating the chassis from the earth with a 600V 35A bridge wiring up the diodes in both ways would solve many of the problems without compromise of safety and without the inherent problems of a loopbreaker. The idea is so simple but why nobody has recommended it?

@HiFiNutNut
If you are using the term "earth" to refer to the safety ground, it would be illegal to isoloate it from the chassis. The safety ground or "earth" must be bonded to the chassis close to its entrance into the chassis. This make perfect sense.

If you are using the term "earth" to refer to the signal ground reference point, then isolating it from the earthed chassis would degrade, so to speak, the shielding of the components, since it is said by the experts quoted in the article that for best shielding, the signal ground reference should be at the same potential as the shield (chassis).

Thanks Dave for outing the sources for the desirablility that the chassis and signal grounds should tied together for best shielding. I've been saying this in several posts, but didn't make any effort to dig through Morrison, Ott, etc., to get the support for this. I agree with Dave that the ground isolation is a crutch to less than ideal grounding schemes. Of course, if you are one of those that insists that shielding makes for inferior audio reproduction, ....
  Reply With Quote
Old 30th April 2010, 02:37 PM   #16
David Davenport is offline David Davenport  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Raleigh North Carolina
Yes, there is a picture missing and a few pictures that need the be updated but I haven't found out how to edit the pictures yet.

Dave
  Reply With Quote
Old 30th April 2010, 07:01 PM   #17
David Davenport is offline David Davenport  United States
diyAudio Member
 
Join Date: Jun 2004
Location: Raleigh North Carolina
Well, I figured a way to modify the pictures by hosting them on my own site rather than the diyAudio site. However I hope this is not a permanent solution because if my site ever went away ....

Dave
  Reply With Quote
Old 6th May 2010, 02:48 PM   #18
dave w p is offline dave w p  England
diyAudio Member
 
Join Date: Apr 2010
Location: Leicester
Don't forget when using star earths the ideal is to use a single earth point, also avoid duplication of earthing. This is not always practical but must always be aspired to.
The HIFI site
Facebook Login
  Reply With Quote
Old 29th May 2010, 10:02 PM   #19
sk1 is offline sk1  Denmark
diyAudio Member
 
Join Date: May 2010
Location: Copenhagen
Default USB isolation between soundcard and amplifier

Avoiding ground loops are important when dealing with audio line signals of 100mv against the capacity safety coupling which produces half the mains potential. One way to avoid ground loops is to use magnetic coupling as described in the splendid article. This product is using this technique for isolating USB devices - USB 2.0 Isolator - Isolated USB

The rectified mains idea is a killer. If the ground wire fails everything is at sqrt(2)*mains voltage - very dangerous. Futhermore diodes makes a lot of noise when they turn on/off - typically at 0.3-0.7 forward voltage. There will also be a voltage difference over the diode (the forward voltage). - So connecting to another device would draw real current in the data/signal wires. So thats why it is not done via a diode bridge solution.

I have developed the USB2ISO module to isolate a PC from USB devices like a USB soundcard to avoid ground loops. Works great for USB devices.

Last edited by sk1; 29th May 2010 at 10:17 PM.
  Reply With Quote
Old 29th September 2010, 07:11 PM   #20
MrDG9 is offline MrDG9
diyAudio Member
 
Join Date: Sep 2010
Kudos Mr. Davenport

Essential...
  Reply With Quote

Reply


Audio Component Grounding and InterconnectionHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Anyone tried component video cable for audio use? brents82 Everything Else 9 6th January 2010 03:02 AM
Bryston quad-complementary interconnection Ragnwald Solid State 33 11th July 2008 04:55 PM
New to car audio and could use some component/sub suggestions Stewart8989 Car Audio 6 14th July 2006 08:09 AM


New To Site? Need Help?

All times are GMT. The time now is 05:27 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki