Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

2KW transformer
2KW transformer
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 1st September 2006, 03:04 PM   #1
barendh is offline barendh  Netherlands
diyAudio Member
Join Date: Sep 2006
Default 2KW transformer

Hi all,

Want to convert my Outlaw Audio 7*200W @ 8 Ohms final from 115V to 230V power line.
As there were 2 toroids inside, I thought wiring the primaries in series would be an easy solution...not so.
I did not want an enormous step down transformer humming away in my audio rack...

The amp has 7 identical amp modules with their own rectifiers and smoothing, every module requiring twice 25V (29V open).
Turned out the toroids are different (duh!) as one is for 4 and the other for 3 channels...
Diameter is 15cm, one a bit thicker than the other.
They're not potted, but I can't get to the primaries without stripping the entire cores...

Found that wiring an extra enforcement transformer's split primary 0-115-230V across the series primaries works reasonably well, measured in quiescent state the distributed Vpri changed from 75/140 to 110/116V.

First question:
Is there a better way to tackle this, short of buying very expensive high power 230V toroidals?

The amp as supplied is almost impossible to handle: 51 kg!
Dented the stairs schlepping the beast up to my little lab en down again, my wife was NOT pleased...
So my idea is moving the transformers to a second cabinet.
As is, it means making a plug-and-socket cable having 28 leads carrying some considerable current...

Second question:
A. What would be the penalty for connecting all these primaries together so I can have just a 2 wire umbilical?
B. Or should I go for a 2 + 2 wire solution (since every module is fully balanced - requiring twice 25-0 volts).

Thanks for your input!
  Reply With Quote
Old 14th November 2010, 10:10 AM   #2
mrivera982 is offline mrivera982  United States
diyAudio Member
Join Date: Aug 2010
Location: Hawaii
I am new to this however, correct me if I am wrong... +/- 29 volt rails do not provide enough voltage for 200 watts RMS into 8 ohms. Am I missing something?
  Reply With Quote


2KW transformerHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Using mains transformer as output transformer Elias Tubes / Valves 176 11th March 2013 10:35 PM
Modulation transformer for a driver transformer? ironradio Tubes / Valves 6 28th December 2008 06:05 PM
filament transformer vs plate transformer contaxchen Tubes / Valves 10 14th January 2005 11:43 AM
toroid Transformer as power Transformer for tube tone Tubes / Valves 7 11th February 2003 09:57 AM
toroid Transformer as output Transformer for tube preamp? tone Tubes / Valves 15 2nd February 2003 05:36 AM

New To Site? Need Help?

All times are GMT. The time now is 03:18 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio