Comments on toroids anyone? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 17th August 2001, 08:24 PM   #1
diyAudio Member
Join Date: Aug 2001
Default Comments on toroids

Can anyone give some general comments commercially available toroidal transformers? e.g made by Toroid corp, Avel...which would you recommend? Well it's common to hear that some readily available toroids are......not up to the job? Thanks

[Edited by cp642 on 08-17-2001 at 03:44 PM]
  Reply With Quote
Old 17th August 2001, 09:21 PM   #2
diyAudio Member
Join Date: Jan 2001
Location: Scandinavia
Manufacturers should use a different type of iron for audio power transformers, and probably lower field intensity to boot.

I would consider getting something from Plitron if you are US based, but I have not tested these units. I know BAT and others use Plitron.

  Reply With Quote
Old 17th August 2001, 09:33 PM   #3
diyAudio Member
Join Date: Aug 2001
Hi Petter thanks for your reply, I've came across an article somewhere in the net stating that the quality of a transformer can be determined by measuring their quiescent current across the secondary....the lower the better which is somewhere in the miliamps range. any comments?

  Reply With Quote
Old 17th August 2001, 10:47 PM   #4
diyAudio Member
Join Date: Jan 2001
Location: Scandinavia
I think this is an oversimplifaction. There are many factors to consider and I doubt anyone can name them all. One thing that you should look for though is completely separate output windings (no center tap allowed -- that means at least 4 wires on secondary side -- 3 is definitely not recommended if you can choose). This allows you to use two bridges and avoid large currents in the center tap (ground).

If you have very large losses, you also get a lot of heat. Losses are probably more a function of field strength and magnetostriction (material choice) than winding technology due to the incredibly high ratio of magnetic properties of iron wrt air. However, winding techniques for minimum leakage do exist -- you cannot wind the toroid perfectly with one wire, one pass going the same "filler" direction -- it just does not work. Tension is also important I guess. How about materials used for isolation? How about metal thickness (core is wound up of a sheet of metal to minimize Eddie core losses. How about geometry of the core (height versus inner/outer radius etc.)

I like potted center units -- some people pot the whole thing to reduce mechanical effects.

  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
A few toroids imix500 Swap Meet 12 28th March 2010 05:40 PM
Toroids FS sandstorm33 Swap Meet 4 5th February 2008 04:57 PM
WTB: 43-0-43 or 46-0-46 Toroids K-amps Swap Meet 3 17th November 2006 08:03 PM
toroids on top of each other ? Jaap Tubes / Valves 9 28th May 2004 10:17 PM

New To Site? Need Help?

All times are GMT. The time now is 03:48 AM.

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