earthing painted metal chassis (buzz + safety) - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Construction Tips

Construction Tips Construction techniques and tips

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 11th February 2012, 04:43 PM   #11
diyAudio Member
 
scott17's Avatar
 
Join Date: Aug 2009
Location: JFK
Sounds like something is amiss with the circuit ground. It seems like you might be getting the signal ground by way of the input cable ground from the source device. When you disconnect the inputs it loses the ground connection. By the way, does it buzz with only one input disconnected or do you have to disconnect both channels.
  Reply With Quote
Old 13th February 2012, 01:26 PM   #12
diyAudio Member
 
Join Date: Sep 2009
The amp is built as 2 entirely separate monoblocks. Thus if I disconnect the RCA from the right channel, then the right channel will buzz, if I disconnect the RCA from the left channel then the left channel will buzz (I tested this last night just to make sure!).
  Reply With Quote
Old 13th February 2012, 03:17 PM   #13
diyAudio Member
 
Join Date: Nov 2008
Location: Oakmont PA
Try removing the AC mains connection from one amplifier and see if the active channel still buzzes. If it does, on that channel reverse the transformer primary winding connections. See if the buzz gets louder. Reconnect the primary leads for the lowest buzz. (Duh, of course you knew that.) Now reconnect the other side and check for which way the primary windings give the lowest noise.

If all else fails place a 100K resistor at the input jack from hot to ground.
  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
Dual chassis earthing question audio_cf Pass Labs 3 21st April 2006 08:12 PM
first I earth the chassis for safety but why do I need to conect it to my ground... frank2395 Pass Labs 4 20th May 2005 12:15 PM
Non-ferrous chassis and fire safety KT Parts 0 14th February 2005 04:17 PM


New To Site? Need Help?

All times are GMT. The time now is 10:18 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