Grounding with separate enclosures - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 23rd March 2009, 06:43 PM   #1
CfM is offline CfM  Germany
diyAudio Member
 
Join Date: Sep 2007
Default Grounding with separate enclosures

Hi,

until now all amps I built stay within one enclosure shared by power supply and amp. The mains earth is connected to the enclosure and signal ground is connected with the enclosure/earth via a resistor or thermistor.

But what to do if amp and power supply stay in different enclosures?
1) Connect mains earth to the power supply enclosure, don't wire earth to the amp and connect signal ground to the amp enclosure.
2) Connect mains earth to the power supply enclosure, wire earth to the amp, connect mains earth to the amp enclosure, connect signal ground via resistor/thermistor.

Which option is to be preferred?


Greetings,
Chris
  Reply With Quote
Old 23rd March 2009, 06:46 PM   #2
Eva is offline Eva  Spain
diyAudio Member
 
Eva's Avatar
 
Join Date: Oct 2003
Location: Near the sea
Send a message via MSN to Eva
Why two enclosures?
__________________
I use to feel like the small child in The Emperor's New Clothes tale
  Reply With Quote
Old 24th March 2009, 08:36 PM   #3
CfM is offline CfM  Germany
diyAudio Member
 
Join Date: Sep 2007
Quote:
Originally posted by Eva
Why two enclosures?
There are two reasons. First reason is to get the transformer far away from the signals, second reason is that sometimes there simply isn't enough space in one enclosure (which applies for my Ono clone ).

Greetings,
Chris
  Reply With Quote
Old 27th March 2009, 10:42 PM   #4
TechGuy is offline TechGuy  United States
diyAudio Member
 
Join Date: Apr 2006
Location: Connecticut
Simple Option: Carry over both ground lines (Main and signal). Repeat method using the first enclosure.
  Reply With Quote
Old 28th March 2009, 04:12 AM   #5
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
Do option 1) if you don't care about EMI/RFI otherwise use option 2.) with isolated inputs and single star point chassis ground.
Make sure in either case, safety is number 1 and try to minimize any return currents (noise) through earth/metal case/shield. This includes 2a) Do not use input resistors to case ground, 2b) Use a single connection from the small signal gnd to caseground.
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  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
Lions and Tigers and Grounding Problems, Oh My! DoZ Grounding... EchoWars Solid State 37 3rd August 2008 09:50 AM
Separate PSU grounding decky Power Supplies 1 20th March 2008 09:40 PM
LM3875 kit grounding, optimal grounding for separate amps and psu? findog Chip Amps 9 16th May 2005 10:27 PM
Separate Pre-amp or Inbuild debipilu Solid State 3 4th January 2003 09:13 AM


New To Site? Need Help?

All times are GMT. The time now is 08:01 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