Transformer Wiring... 5 wires on secondary? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 10th October 2004, 12:59 PM   #1
diyAudio Member
 
Join Date: Oct 2004
Default Transformer Wiring... 5 wires on secondary?

I am wiring a transformer to supply about 15-0-15 for an audio amplifier. I need help as I am first time wiring a transformer.

Here is what I have.

My transformer is a single primary 115V and and it seems a dual secondary.

The secondary section has 5 wires. 2 red 1 black and 2 green.

Both red to black measure 15v
Red to Red measures 30v
Green to green measures 3.8v
Green to red is 0v
Green to black s 0v

I am trying to figure what wires are part of which of the secondary windings?

Is there a center tap or do I need to make a series connection and create a center tap?


Thanks in advance,

Dean
  Reply With Quote
Old 10th October 2004, 02:47 PM   #2
diyAudio Member
 
djmiddelkoop's Avatar
 
Join Date: Feb 2003
Location: Noord-Holland
Dean,

Quote:
15-0-15
red - black- red

Quote:
Is there a center tap
the black wire

The green wires are a different winding that you don't need.
Leave them unconnected, and if bare copper wire is showing be shure it's not touching anything, i.e. isolate.

Dick.
__________________
“Information is not knowledge.Knowledge is not wisdom.
Wisdom is not truth.Truth is not beauty.Beauty is not love.Love is not music.Music is THE BEST.”
  Reply With Quote
Old 10th October 2004, 02:54 PM   #3
diyAudio Member
 
Join Date: Oct 2004
Thanks. I have been told that I can't leave a secondary wiring unconnected, but maybe that is on the primary side.

As you say, I can leave the 2nd secondary not connected and isolated.

Can you clarify this?

Just a thought, can I put the 2nd secondary circuit in series to the 15-0-15 to increase the voltage?

Thanks again,

Dean
  Reply With Quote
Old 10th October 2004, 06:48 PM   #4
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
DOn't do that. The 15-0-15 winding once rectified will give you +/-20 more or less, and you can regulate that down to +/-15 with a couple 7815 or similar things. Ading the other winding in there creates many new questions. Just tape the green wires and anchor them out of the way somewhere. No reason in the world they HAVE to be in use.
  Reply With Quote
Old 10th October 2004, 07:58 PM   #5
diyAudio Member
 
Join Date: Oct 2004
Thanks. Very helpful.

I will use just the 15-0-15 winding.

I purchased the transformer from a surplus store. I do not know the power rating. The center tapped winding is 30V. How do I measure the VA rating?
  Reply With Quote
Old 11th October 2004, 03:10 AM   #6
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
If you look in a tranformer makers catalog you will see the dimensions of them listed by wattage or VA (volt-amps, close enough to wattage for me) The output current and voltage can vary, but the wattage determines the size of the iron. A tranny that puts out 12 volts at 10 amps would be the same size as one that puts out 24v at 5A. or for that matter 240v at half an amp. All of those put out 120 watts.

You can infer the basic wattage by lookin at the size of the iron and comparing it to other know products. Not exact, but close. Once you know the wattage, you can check the voltage and infer current.

You can also load the secondary and monitor it to see how much current it produces before sagging a lot.
  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
Tubelab sse transformer wires newtube Tubes / Valves 9 12th May 2009 01:29 PM
help with transformer secondary jarthel Power Supplies 34 8th July 2006 01:01 AM
Transformer wires too small? drfrink24 Chip Amps 3 4th March 2005 06:45 PM
Power Supply Secondary wires Mermprin Parts 4 20th July 2004 09:32 AM


New To Site? Need Help?

All times are GMT. The time now is 08:22 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