Single Device - Ground Loop hum - Page 2 - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

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 24th April 2012, 10:34 PM   #11
diyAudio Member
 
Join Date: Oct 2004
I've been fiddling with my amp recently to reduce hum, and found that one of the contributing factors to my earthing problems was the preamp, so it's good to try and rule it out.
  Reply With Quote
Old 24th April 2012, 11:41 PM   #12
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Quote:
Originally Posted by philpoole View Post
I've been fiddling with my amp recently to reduce hum, and found that one of the contributing factors to my earthing problems was the preamp, so it's good to try and rule it out.
its my new little preamp that was creating some hum - that I at least reduced. Further testing as I described above seemed to indicate otherwise. At this point I'm not sure where its entering the audio chain.
  Reply With Quote
Old 27th April 2012, 01:39 AM   #13
redjr is offline redjr  United States
diyAudio Member
 
Join Date: May 2011
Location: Danbury, CT
Update....

After more 'process of elimination' testing I discovered that the hum I was getting was indeed coming from my new amp build. I had tried hooking up some shielded cable from the RCA inputs to the amp module, but decided not to ground the shield. The decision not to use the shield (2nd wire) was based on some other discussions I had read here about star grounding strategy. For some reason it did not work for me.

To fix the problem I decided to use - readily available - 2 twisted pairs from some CAT5 cable I had. This was a departure for me from using RG-174/U coaxial cable. Connecting up both wires, at both ends, signal and ground has virtually eliminated the remaining hum. While there was some hum issues with my source selector device(since fixed), it was further amplified in my amp. Problem solved. It's now time to get the amp off the bench and into service.
  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
Ground loop isolation to get rid of hum? Peter Pan Music 24 22nd May 2011 11:29 AM
Intercomponent ground loop hum pforeman Tubes / Valves 15 4th November 2009 03:24 PM
Ground loop/hum on Inca Designs ID1P/ID75 quickie Solid State 39 13th September 2008 07:31 AM
hum,ground loop,earth loop problem with your answers please frank2395 Pass Labs 2 17th May 2005 07:46 PM
Ground loop hum jag Pass Labs 20 25th November 2002 06:32 PM


New To Site? Need Help?

All times are GMT. The time now is 01:34 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