What type of wire for signal in? - Page 5 - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 30th September 2011, 03:24 AM   #41
tinitus is offline tinitus  Europe
diyAudio Moderator R.I.P.
 
Join Date: Nov 2005
ah, ok

I think you may have misunderstood when I said he could disregard the foil
I didn't mean not to connect the shield, ofcourse
what I meant is that the foil is automatically connected to the shield, all way through cable
  Reply With Quote
Old 30th September 2011, 03:39 AM   #42
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Quote:
Originally Posted by tinitus View Post
ah, ok

I think you may have misunderstood when I said he could disregard the foil
I didn't mean not to connect the shield, ofcourse
what I meant is that the foil is automatically connected to the shield, all way through cable
Tis so. I was refering to not connecting sheild on either end being a bad idea. While you could probably get away with it in many applications a high RF environment soon ferrets out what works and what doesn't. Didn't mean to step on any toes... I quite like it here.
Doc
__________________
Ne timeas a facie mulierum ea ignorare
  Reply With Quote
Old 30th September 2011, 03:48 AM   #43
diyAudio Member
 
Join Date: Sep 2010
For the 3-conductor coax that's being used for the potentiometers...where do hook up the foil and braid to? The ground wire?
  Reply With Quote
Old 30th September 2011, 04:04 AM   #44
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Quote:
Originally Posted by TheLaw117 View Post
For the 3-conductor coax that's being used for the potentiometers...where do hook up the foil and braid to? The ground wire?
In that case you are using one wire as send, the second as return and the sheild/ground as ground refference on the pot. The sheild would then be connected to local ground on board end but only to low end of pot on volume control end. A stereo pot can be wired using two 8451 cables. Best is to run one cable per channel with send-return leads inside sheild/ground ref. Rather than using one cable for send and one for return. That might contribute to crosstalk between channels.
Doc
__________________
Ne timeas a facie mulierum ea ignorare
  Reply With Quote
Old 30th September 2011, 04:49 AM   #45
diyAudio Member
 
Join Date: Sep 2010
I'm using 2 pots for a ghetto stereo balance thing. =p

So the shield can be hooked up to the ground wire for the potentiometer? But not physically to the pot? Only to the board?
  Reply With Quote
Old 30th September 2011, 05:09 AM   #46
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Quote:
Originally Posted by TheLaw117 View Post
I'm using 2 pots for a ghetto stereo balance thing. =p

So the shield can be hooked up to the ground wire for the potentiometer? But not physically to the pot? Only to the board?
No... The ground at the pot end doesn't normally connect to anything else, such as chassis. The refference point (source connection) is at the amp board end.

Don't know what configuration for balancing you are using, but if it is a board that has common ground reference connections the balance board itself should not connect to chassis ground except through feed cable. The sheild connections should not create a full loop.

====GC_______________GC======= creates a ground loop through chassis (where GC=ground connection)

====NC__________________GC=== or =====GC_____________NC===== is correct. (Where NC=No connection) (=== is twin wires inside)

Doc
__________________
Ne timeas a facie mulierum ea ignorare
  Reply With Quote
Old 30th September 2011, 05:14 AM   #47
diyAudio Member
 
Join Date: Sep 2010
I wasn't talking about "chassis ground". I just meant the board's ground plane. By ghetto balance thing, I mean just two potentiometers, each controlling a channel. I'm just asking if the braided shield gets hooked up to the ground wire for the pot. I'll have to make a diagram so I'm understood.
  Reply With Quote
Old 30th September 2011, 05:34 AM   #48
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Just this way:
http://i1112.photobucket.com/albums/...doc/volume.jpg
__________________
Ne timeas a facie mulierum ea ignorare
  Reply With Quote
Old 30th September 2011, 06:01 AM   #49
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
I have to say I'm quite fond of the RG-58 type of wire, cheap, shielded, robust and durable.
  Reply With Quote
Old 30th September 2011, 02:28 PM   #50
diyAudio Member
 
Join Date: Sep 2010
Quote:
Originally Posted by thaumaturge View Post
I see that, but if I'm using a 3wire coax...?

Also what happens if I don't hook up the shield to anything?

I mean I could just use the extra 8451 that I have instead of the coax, jw.
  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
Best type of wire for re-cabling AKG 701's .. anyone do this? NOTFRAGILE Headphone Systems 22 26th March 2013 03:36 AM
What is signal level/type at the USB connection? peace brainerd Digital Line Level 4 29th August 2009 07:58 AM
Replacing electroytics in signal path with non-polarised - which type of caps to use? jpcoetzee Solid State 13 15th May 2008 01:12 PM
line out signal wire question fragman56 Everything Else 6 24th November 2006 01:51 PM
signal wire yuval Tubes / Valves 4 21st October 2002 02:26 PM


New To Site? Need Help?

All times are GMT. The time now is 07:09 PM.


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