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 17th May 2012, 07:15 AM   #1
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Default Dual Polarity PSU Question

I have purchased a -12vDC/ +12vDC PSU what I dont understand is why it has 3 "Com" connection points. The Linkwitz ASP I am going to power with it only has 1 Com connection & the -12v +12v connections.
Attached Images
File Type: jpg PSU1.JPG (399.4 KB, 169 views)
  Reply With Quote
Old 17th May 2012, 07:29 AM   #2
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
It is just because often you have several wires to take back to the common point, saves you trying to get them all in one terminal. If you only have a couple of wires just use the middle one.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 17th May 2012, 09:36 AM   #3
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by richie00boy View Post
It is just because often you have several wires to take back to the common point, saves you trying to get them all in one terminal. If you only have a couple of wires just use the middle one.
Thanks
  Reply With Quote
Old 17th May 2012, 11:17 AM   #4
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Perhaps they use the same terminal block for several different PSUs with different outputs.
  Reply With Quote
Old 17th May 2012, 11:55 AM   #5
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Check the resistance from com to com.
__________________
regards Andrew T.
  Reply With Quote
Old 18th May 2012, 03:02 AM   #6
diyAudio Member
 
Join Date: Oct 2009
Thanks for posting this info. I was looking for such PS previously. Anyway, I had already purchased and DIYed the usual toroidal trans and bridge rectifier type to power my phono preamp.

Wondering which is better; this one or the one with toroidal trans? Thanks.
  Reply With Quote
Old 18th May 2012, 07:35 AM   #7
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
I would say neither is better, both have advantages and disadvantages. Don'y worry about it and just use what you already got
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  Reply With Quote
Old 18th May 2012, 11:28 AM   #8
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Quote:
Originally Posted by AndrewT View Post
Check the resistance from com to com.
Why
  Reply With Quote
Old 18th May 2012, 12:02 PM   #9
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
they might be connected to each other.
or
they might not be connected to each other.
__________________
regards Andrew T.
  Reply With Quote
Old 18th May 2012, 12:32 PM   #10
Did it Himself
diyAudio Member
 
richie00boy's Avatar
 
Join Date: Nov 2003
Location: Gloucestershire, England, UK
Unlikely as that would defeat the point of a COMmon terminal.
__________________
www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
  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 polarity power supply with a single secondary transformer? tuhkam Power Supplies 43 29th September 2013 12:11 AM
Polarity question pcwu Multi-Way 3 10th July 2011 02:55 AM
Dual transformer polarity/wiring Zero Cool Everything Else 15 20th March 2007 03:19 PM
Question about Dual Polarity Power Supp. (Ashamed to ask) TaaJ Chip Amps 11 28th August 2004 09:27 PM


New To Site? Need Help?

All times are GMT. The time now is 05:24 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