Grounding of a custom power supply - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 30th December 2012, 08:50 PM   #1
diyAudio Member
Join Date: Jul 2012
Location: Gatineau
Default Grounding of a custom power supply

I am experiencing with power supplies and I am wondering how does one wire the supply for grounding. As I would like to see what is happening with an oscilloscope and there is always a voltage present between the probe ground and any terminal of the transformer, the fuse blows up.

Would someone be kind enough to point me to information answering the following questions:

- Do I connect the sector ground to the chassis?
- Do I connect the center tap of the secondary (for dual voltage power supply, for op amp polarization) to the chassis too?

Thank you,
  Reply With Quote
Old 30th December 2012, 09:51 PM   #2
diyAudio Member
Join Date: Feb 2012
Xfmr sec neutral/center tap should go to the chassis ground/mains earth/safety earth what ever you want to call it.

See here for how to ground...understanding star grounding

And here...Transformer grounding questions

The scope probe should be on the hot, the probe ground the earth always. Never use the probe ground to measure floating / energized circuits. You can use the ground for measuring if using a differential probe or a battery operated scope. I doubt you have either. The fuse is blowing due to you shorting through the probe ground clip. It is connected to earth on the scope it self. The ground pin on the mains plug.

Last edited by NissanSR20Man; 30th December 2012 at 10:04 PM.
  Reply With Quote
Old 31st December 2012, 03:31 PM   #3
diyAudio Member
Join Date: Jul 2012
Location: Gatineau
Thanks for the info and the links. This helps
  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
Grounding for an external power supply JVDM Chip Amps 7 15th April 2012 02:41 AM
Custom Power Supply for Audio Alchemy DDE 3.0 gto47 Digital Line Level 0 12th November 2011 09:03 PM
Grounding for Mixer and Bipolar Power Supply bbmonster Instruments and Amps 1 20th March 2009 07:59 AM
Outboard power supply grounding ? woody Power Supplies 5 3rd May 2008 09:24 PM
grounding & power supply questions timsch75 Chip Amps 2 15th January 2004 05:04 PM

New To Site? Need Help?

All times are GMT. The time now is 05:38 PM.

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