Grounding - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 15th November 2006, 08:36 AM   #1
diyAudio Member
 
Join Date: Jun 2005
Location: Skopje,Macedonia
Default Grounding

Dear all,
I know that this was covered through this forum, but any way I need to know is this grounding concept OK???
Thank you,
Regards,
Attached Images
File Type: jpg grounding1.jpg (21.4 KB, 462 views)
  Reply With Quote
Old 15th November 2006, 08:51 AM   #2
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
It depends what kind of amplifier you like to build.
E.g., for an AlephX, the speaker grounding would not be valid.

/Hugo
  Reply With Quote
Old 15th November 2006, 09:25 AM   #3
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
move the audio ground off the smoothing capacitors.
You have omitted the transformer return(s).
Connect the transformer return(s) to the rectifier(s).
Connect the rectifier return(s) to the audio ground NEXT to the smoothing cap 0V wire.
It might be worth trying:- connect the rectifier return to the smoothing cap central bolt and then run a PSU 0v wire to the separated audio ground.

You have also omitted signal ground from the PCB and the decoupling ground from the PCB. The decoupling return may be able to share the power ground return back to audio ground, but the decoupling MUST be connected on the amplifier for BEST low impedance performance and then the common 0v tied back to audio ground.

Do you have a Zobel or Thiel network to help stabilise the HF performance? This needs a return as well, although it can be returned on a shared line with the speaker return.

Many leave the fourth XLR connection floating. What do you plan to do with it? Can you buy a 4quad wire with double shield? Connect inner shield to 3 at both ends, and if such a cable exists, connect the outer shield to 4th tag (at the receive end only) and then to either audio ground or chassis. Which is better? Is there any difference? Is the fourth connection any benefit?
Similarly, for the RCA connection:- two core for pin and barrel at both ends. Where to connect the shield? Receive end only or floating and loose wire to chassis bolt? Or no shield and just use twisted pair?

It would be worth the extra connections to leave space across the safety earth bridge for an HF capacitor, just in case experimentation shows some benefit.
__________________
regards Andrew T.
  Reply With Quote
Old 15th November 2006, 09:36 AM   #4
diyAudio Member
 
Join Date: Jun 2005
Location: Skopje,Macedonia
Thank's ,
I forgot to mention. I'm building ALEPH 5 monoblocks. I'm using two bridges-35A per P.S.
  Reply With Quote
Old 15th November 2006, 10:52 AM   #5
AndrewT is online now AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally posted by tonistefanovski
Thank's ,
I forgot to mention. I'm building ALEPH 5 monoblocks. I'm using two bridges-35A per P.S.
Two bridges in parallel or from two different grounds to safety earth?

How do you have different audio grounds in a monoblock?

Are you wiring the bridge diodes in parallel to achieve 70A continuous rating and somewhere over 1kA peak transient? or running at 1.4V and 35A continuous?
__________________
regards Andrew T.
  Reply With Quote
Old 15th November 2006, 02:37 PM   #6
Formerly "jh6you". R.I.P.
 
Babowana's Avatar
 
Join Date: Jul 2006
Default Re: Grounding

Quote:
Originally posted by tonistefanovski


this grounding concept OK???

I think so . . .
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The grounding Professor smith Pass Labs 100 4th July 2009 04:19 AM
some help on dac grounding, please federico moreno Digital Line Level 0 3rd April 2009 06:05 PM
Lions and Tigers and Grounding Problems, Oh My! DoZ Grounding... EchoWars Solid State 37 3rd August 2008 09:50 AM
LM3875 kit grounding, optimal grounding for separate amps and psu? findog Chip Amps 9 16th May 2005 10:27 PM
grounding Lico Tubes / Valves 2 13th November 2003 05:15 AM


New To Site? Need Help?

All times are GMT. The time now is 10:36 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2