Torodial Tranformer Calculation - 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 26th December 2003, 01:41 PM   #1
JanDH is offline JanDH  Netherlands
diyAudio Member
 
Join Date: Dec 2003
Location: Waspik the Netherlands
Question Torodial Tranformer Calculation

I would like to wind some o-cores. Can anyone show me a site where I can find info regarding number of windings, wire thickness and optimize the transformer for audio applications. There should be somewhere an Excel spreadsheet where one can input primary and secundary voltages and power requirements. Some tips on how to actually wind and build.

I would like to have somethin like this:

http://www.feickert.de/Transformator...re/o-core.html
  Reply With Quote
Old 26th December 2003, 05:07 PM   #2
diyAudio Member
 
Join Date: Nov 2002
Location: Michigan, USA
Default Posible source of info...

Hi,

the "o" cores you refer to are usually call toroid cores...

These guys have some good info. They usually cover good solid design...
http://www.mag-inc.com/library.asp

Look for the tape wound cores section. (Tape wound referes to the core itself, not the windings)

Here's the link:
http://www.mag-inc.com/pdf/twc-s1.pdf

The page will probably have the information you will need. Once you understand the concepts, designing a transformer isn't really all that difficult.

Good Luck!
-Dan
__________________
-With a bad amp, everything sounds the same. It takes a good amp to tell the difference between true "Artists" and the rest of the "Performers".
  Reply With Quote
Old 26th December 2003, 05:30 PM   #3
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Default Re: Torodial Tranformer Calculation

Quote:
Originally posted by JanDH
I would like to wind some o-cores. Can anyone show me a site where I can find info regarding number of windings, wire thickness and optimize the transformer for audio applications. There should be somewhere an Excel spreadsheet where one can input primary and secundary voltages and power requirements. Some tips on how to actually wind and build.

I would like to have somethin like this:

http://www.feickert.de/Transformator...re/o-core.html
If you don't have very special requirements I advice you not to make your own transformer just because this is a safety issue. Since you live in Europe the transformer must be safe at 230 VAC andbe able take 4000 volts between primary and secondary windings.
http://www.trafoshop24.de
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 26th December 2003, 06:29 PM   #4
Banned
 
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Default If you want to make your own.....

Make sure that the windings are evenly distributed over the entire core.

Jocko
  Reply With Quote
Old 26th December 2003, 09:36 PM   #5
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
http://www.tech-diy.com/smps_xfmr.xls
  Reply With Quote
Old 26th December 2003, 10:13 PM   #6
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg


I like the spirit.....but this is stupidity.

I like to make all kinds of stuff myself as well....i honestly hate the fact that i cant make mosfets....but thats life.

To wind your own trafo is dangerous.....very dangerous....potentially lethal.

Like most people on this forum ive had an accident or two with mains power, and that hurts (under the wrong circumstances...lethal as well), but a trafo not made 120% up to CE specifications (trust me, you cant do that, it takes the right machinery) is a very unlucky thing to have around, not to mention the risk to blow your entire stereo.

As peranders mentioned, even testing the trafo at 4KV is quite risky....believe me, i grew up with an electromechanic for a dad.

I cant believe so many people have been helpfull to this project, it cant be true that only peranders is equipped with a brain. Not a nice thing to say..i know, but this is shocking

This thread is hereby reported to the moderator.

Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 26th December 2003, 11:37 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Butler, Pennsylvania, USA
Send a message via AIM to koolscooby
sicne when have members been restricted on what we discuss and what activities we partake? as far as i nkow, never hehe... people make their own transformers here all the time... just wondering why Magura is reporting this to moderators when people arej ust trying to expand their knowledge....
__________________
Brad
  Reply With Quote
Old 27th December 2003, 12:39 AM   #8
diyAudio Member
 
Brian Donaldson's Avatar
 
Join Date: Jan 2003
Location: Texas, Love it or leave it
Settle down Magura, Don't be a puss.

Toriod.com in the us sells kit transformers with the primary already wound and data to roll your own secondary. Look around on thier site, you may get some ideas.
  Reply With Quote
Old 27th December 2003, 07:25 AM   #9
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
230 V primary winding takes approx. 230 /0.3 turns (0.3 V per turn) = 700-800 turns nice and even winded. How many meter do you need? Many! Hopeless project!

If you start with which power you need volt and VA, I'm sure you can find a new or used toroid suitable for your needs.

State your requirements and we can help you telling what you need.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 27th December 2003, 07:54 AM   #10
elizard is offline elizard  Canada
diyAudio Member
 
Join Date: Mar 2003
Location: Winnipeg, MB
Send a message via MSN to elizard
Quote:
Originally posted by peranders
230 V primary winding takes approx. 230 /0.3 turns (0.3 V per turn) = 700-800 turns nice and even winded. How many meter do you need? Many! Hopeless project!

If you start with which power you need volt and VA, I'm sure you can find a new or used toroid suitable for your needs.

State your requirements and we can help you telling what you need.

Hopeless project???
lets say 800 turns .. the diameter of the core (cross-section this is btw) would be what, 2cm tops?
so, that makes the circumference 12.566cm
so you end up with just over 100m of wire .. 100m of magnet wire is a very manageable chunk (once you start winding some HUGE 3 phase electrical motors, you'll understand)

I'm not sure why people are so uptight about winding transformers. Not sure if its the toroids, or transformers in general, because i've heard of many people winding EI's (and I can see how its fairly easy to wind an EI). Toroid, although more difficult to wind, i'm sure can't be THAT hard.
I mean, people deal with voltages and currents in amps that would kill a horse regularly without much in terms of worries (apart from common sense, and some safety precautions)

Although, as said, if its a standard secondary voltage, you will probably be MUCH better off to buy a new one. In canada you can get a 1000VA toroid for $140, and a 1500VA one for $200 from plitron ..
so unless you need several 1000VA transformers, or you need transformers that have a hundred and one different secondary voltages, its not cost effective to build JUST one
(although one can build multiple then sell them)
  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
Output regulator after torodial transformer? freestylez Power Supplies 9 25th June 2009 01:46 PM
Encapsulated Torodial for solid state Pocoyo Solid State 22 1st June 2007 01:29 AM
torodial transformers? monomonster Parts 23 17th October 2005 08:48 AM
WTB: dual 45-55v torodial transformer ycl Swap Meet 1 23rd March 2005 06:48 PM


New To Site? Need Help?

All times are GMT. The time now is 09:19 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