Dual primary transformer help - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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 31st July 2012, 06:57 AM   #1
JZatopa is offline JZatopa  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago
Default Dual primary transformer help

Could someone tell me the proper way to hook up the transformers primaries for 120v?

http://www.apexjr.com/images/66938_sc7.pdf

The secondary is easy but I am not sure what color wires go to the hot, neutral and ground.
  Reply With Quote
Old 31st July 2012, 10:14 AM   #2
yai is offline yai  Germany
diyAudio Member
 
yai's Avatar
 
Join Date: Aug 2011
Location: Jo'berg
i would connect them in parallel for 120V, so connect 1 and 2, 3 and 4, the 1/2 combination to neutral, 3/4 to hot (but actually that does not make any difference, it's AC anyway). don't know what tha 1A and 4A are for.
  Reply With Quote
Old 31st July 2012, 02:27 PM   #3
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
1 and 4 are likely for 110/220V, 1A and 4A for 120/240V
  Reply With Quote
Old 31st July 2012, 02:32 PM   #4
JZatopa is offline JZatopa  United States
diyAudio Member
 
Join Date: May 2003
Location: Chicago
That was what I was thinking but I needed some confirmation.

Any problem with connecting 1,1a and 2 and doing the same for 3,4a and 4?
  Reply With Quote
Old 31st July 2012, 04:51 PM   #5
yai is offline yai  Germany
diyAudio Member
 
yai's Avatar
 
Join Date: Aug 2011
Location: Jo'berg
connect 1 and 3 to mains, measure the secondary voltages, and do the same with 1a and 3. any difference? or measure the resistance between 1 and 3 and 1a and 3.
  Reply With Quote
Old 1st August 2012, 06:26 AM   #6
diyAudio Member
 
Join Date: Jul 2003
Location: Dona paula, Goa
I would say u should not buy this/use this transformer as the schematic is very vague/wrong.
  Reply With Quote
Old 1st August 2012, 11:18 AM   #7
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Hi,

I'd say 1A and 4A are for a 240V arrangement, 3 and 2 joined.

rgds, sreten.
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
  Reply With Quote
Old 1st August 2012, 02:51 PM   #8
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
Quote:
Originally Posted by gmphadte View Post
I would say u should not buy this/use this transformer as the schematic is very vague/wrong.
Avel Lindberg is a very reputable manufacturer. I agree that the diagram could be better though. Measuring dc resistance from 1 to 2 and 1A to 2 will confirm which way has the most turns and therefore was intended for the higher voltage
  Reply With Quote
Old 1st August 2012, 03:04 PM   #9
yai is offline yai  Germany
diyAudio Member
 
yai's Avatar
 
Join Date: Aug 2011
Location: Jo'berg
Quote:
Originally Posted by yai View Post
connect 1 and 3 to mains, measure the secondary voltages, and do the same with 1a and 3. any difference? or measure the resistance between 1 and 3 and 1a and 3.
1 and 2 are not connected.
  Reply With Quote
Old 1st August 2012, 04:02 PM   #10
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
Quote:
Originally Posted by DJNUBZ
Any problem with connecting 1,1a and 2 and doing the same for 3,4a and 4?
Use 1 or 1A, 4 or 4A. Joining 1 and 1A together will cause a short and things will get very hot very quickly.

You can't parallel all three connections for both windings because for some reason they have put the extra part on the opposite ends of the two windings. So for 110V join 1 and 2, and 3 and 4, then use 1/2 for one connection and 3/4 for the other. For 120V join 1A and 2, and 3 and 4A, so the two connections then are 1A/2 and 3/4A. How do I know this? Look for the dots at the end of the winding diagram.

Last edited by DF96; 1st August 2012 at 04:08 PM. Reason: add extra on parallel connections
  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
50VA Toroidal Transformer Dual Primary 120/120 and Dual Secondary 15/15 KatieandDad Swap Meet 3 11th February 2012 06:26 AM
dual primary//dual secondary toroid larryg Chip Amps 22 6th September 2006 09:24 PM
Dual primary wiring for Plitron standard toroid sardonx Chip Amps 6 3rd August 2005 05:16 AM
Finding phase of dual primary tranny sbear Pass Labs 4 26th February 2005 07:11 AM
General ? On Dual Primary Transformers - Double UP? Super_BQ Pass Labs 16 27th July 2004 08:33 AM


New To Site? Need Help?

All times are GMT. The time now is 02:03 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