ground loop breaker - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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
Thread Tools Search this Thread
Old 27th August 2003, 02:07 AM   #1
biff584 is offline biff584  United States
diyAudio Member
Join Date: Jun 2002
Location: Villanova, PA
Send a message via AIM to biff584
Default ground loop breaker

I built a P3A amp and was having problems with ground loops, so between the amp's signal and power grounds and the earth ground I place a loop breaker consisting of two diodes in parallel in opposite directions and a 10 ohm resistor. This greatly reduced the ground loop, but I can still hear it- are there any other adaptions I can make to further reduce the effects? I was thinking about upping the size of the resistor, removing the resistor, or maybe even trying to add a simple RC low-pass filter designed to reject frequencies at and above 60Hz between the signal and earth grounds.

Thanks alot.

Attached Images
File Type: jpg groundloop.jpg (16.4 KB, 736 views)
  Reply With Quote
Old 27th August 2003, 11:15 AM   #2
trwh is offline trwh  United Kingdom
diyAudio Member
trwh's Avatar
Join Date: Apr 2002
Location: UK

You could try increasing the value of the resistor - although I wouldn't leave it out altogether. In one design I saw a 100 ohm part used; as long as you keep the diodes any value is safe to try. Many designs also use a 100nF mains rated capacitor in parallel with the other components to bypass the resistor at high frequencies.

Hope this helps,
  Reply With Quote
Old 27th August 2003, 12:03 PM   #3
biff584 is offline biff584  United States
diyAudio Member
Join Date: Jun 2002
Location: Villanova, PA
Send a message via AIM to biff584
Thanks, I'll give that a shot and try a 100 ohm resistor instead and see if it help much.

  Reply With Quote
Old 27th August 2003, 12:20 PM   #4
ukram is offline ukram  Finland
diyAudio Member
Join Date: Jun 2003
Location: Espoo, Finland
Try reading Jensen application notes.

You should show us a picture with the ground connections of your whole system...
  Reply With Quote


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
Diode bridge as loop breaker question Tyimo Pass Labs 48 13th December 2016 04:28 PM
How save is a ground loop breaker? k.junold Solid State 0 14th October 2004 07:47 AM
does connecting mains ground with circuit ground create a ground loop? jarthel Everything Else 0 25th June 2003 12:55 PM

New To Site? Need Help?

All times are GMT. The time now is 11:22 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2