Go Back   Home > Forums > >

Construction Tips Construction techniques and tips

Run a ground wire, but not connect it?
Run a ground wire, but not connect it?
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
Old 24th October 2021, 01:56 AM   #1
SoaDMTGguy is offline SoaDMTGguy  United States
Learn, try, fail, learn
diyAudio Member
 
SoaDMTGguy's Avatar
 
Join Date: Jul 2021
Location: Sacramento, CA
Run a ground wire, but not connect it?
Default Run a ground wire, but not connect it?

I'm working on a Hafler DH-110. This connection to the output connections board is wired as according to the manual. Two pairs of red and green wires with an associated ground wire. One ground is soldered to the board, the other is wrapped around its pair. Why run the second ground if it won't be connected? What benefit does this wiring scheme serve?
Attached Images
File Type: jpg IMG_3172.jpg (428.2 KB, 99 views)
  Reply With Quote
Old 24th October 2021, 02:00 AM   #2
rayma is online now rayma  United States
diyAudio Member
 
Join Date: Apr 2011
It acts as a shield, but avoids a ground loop.
  Reply With Quote
Old 24th October 2021, 02:02 AM   #3
SoaDMTGguy is offline SoaDMTGguy  United States
Learn, try, fail, learn
diyAudio Member
 
SoaDMTGguy's Avatar
 
Join Date: Jul 2021
Location: Sacramento, CA
Run a ground wire, but not connect it?
That was my best guess, I’d just never seen it before. Nifty!
  Reply With Quote
Old 24th October 2021, 03:29 AM   #4
rayma is online now rayma  United States
diyAudio Member
 
Join Date: Apr 2011
Similar to when a shielded cable is used with the shield connected only at one end.
  Reply With Quote
Old 24th October 2021, 06:16 PM   #5
Mark Tillotson is offline Mark Tillotson
diyAudio Member
 
Join Date: May 2018
Location: Cambridge UK
I think the black wire is supposed to be connected on both. Looks like its been modified I'd expect the wiring to be screened (although not really needed for a low impedance output).

I'm assuming red and green are the two channels and black is the ground?

Is the ground on the connector PCB actually commoned for the top and bottom rows, its not clear from the photo?
  Reply With Quote
Old 24th October 2021, 06:32 PM   #6
SoaDMTGguy is offline SoaDMTGguy  United States
Learn, try, fail, learn
diyAudio Member
 
SoaDMTGguy's Avatar
 
Join Date: Jul 2021
Location: Sacramento, CA
Run a ground wire, but not connect it?
Yeah, it’s a common ground. This is how it’s specified in the manual.
  Reply With Quote
Old 24th October 2021, 07:09 PM   #7
rayma is online now rayma  United States
diyAudio Member
 
Join Date: Apr 2011
All of Hafler's preamps have been connected in that way.
  Reply to this post

Reply


Run a ground wire, but not connect it?Hide this!Advertise here!
Thread Tools

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
Connect Virtual Ground to Real Ground amendiola Analogue Source 3 17th March 2015 04:08 PM
Should I directly connect my signal ground to chassis ground? Bricolo Solid State 4 18th March 2014 10:42 PM
Connecting amplifier chasis to earth ground, but not amplifier ground Fusion916 Solid State 3 5th March 2014 09:49 PM
To connect or not to connect.......... G Tubes / Valves 4 13th October 2011 09:55 AM


New To Site? Need Help?

All times are GMT. The time now is 12:55 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 13.64%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki