360VA Toroid - diyAudio
Go Back   Home > Forums > Amplifiers > Power Supplies

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 3rd February 2006, 01:36 PM   #1
diyAudio Member
 
Join Date: Dec 2005
Location: PA
Default 360VA Toroid

Anyone have some winding instructions or tips for toroidal transformers? I want to get 55V DC out of one for a 100W mono board.
__________________
Is it not better to burn out, than to fade away?
  Reply With Quote
Old 3rd February 2006, 02:09 PM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Theory of how to wind toroid transformers.

Size and material of core
Wire dimensions
Number of primary turns
Number of secondary turns
Fixation of the windings

Aside from getting it all right,
I do not think you have much money to gain from wind your own trafos.
How come you think of doing it, instead of buying?
__________________
lineup
  Reply With Quote
Old 3rd February 2006, 03:11 PM   #3
diyAudio Member
 
Join Date: Dec 2005
Location: PA
Default Why?

Well... I guess I love a challenge, and I'm a little hardheaded. I guess I'm thinking DIY all the way? LOL I s it really that difficult?
__________________
Is it not better to burn out, than to fade away?
  Reply With Quote
Old 3rd February 2006, 04:24 PM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
start with a pre-wound primary. It should be tested as well.

DIY allows you extra windings exactly matching your requirements.

If a standard pair are good enough then then buy ready made even secondhand, eBay is a good source.

360VA will allow about 180 to 260 Watts of amplifier output. Translated into two channels this equates to 90W+90W upto 130W+130W of continuous power.

There are a number of sites giving winding info and some previous threads here on DIYaudio.
__________________
regards Andrew T.
  Reply With Quote
Old 3rd February 2006, 04:24 PM   #5
croat47 is offline croat47  United States
diyAudio Member
 
croat47's Avatar
 
Join Date: May 2005
Location: Eastern Shore, Maryland
Try:

www.toroid.com. There is a bit of theory on the Kits page. Notice the "Kits" page. They give you what you need, except for magnet wire.

I am looking to build an integrated amp, and the custom aspect of winding your own is appealing for that.

Also, I did find a site that had all the calcs you need for transformer design...I'll look for it again...
  Reply With Quote
Old 3rd February 2006, 04:54 PM   #6
diyAudio Member
 
Join Date: Dec 2005
Location: PA
Default Good deal.

Hey Croat..

That calculator site address would probably help me a lot. Thanx for looking... I already ordered a "kit" last week of toroid.coms 80VA kit just so I could teach myself how to wind them!
__________________
Is it not better to burn out, than to fade away?
  Reply With Quote
Old 3rd February 2006, 05:07 PM   #7
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
Here is a topic about

winding toroidal power transformer
__________________
lineup
  Reply With Quote
Old 3rd February 2006, 05:21 PM   #8
diyAudio Member
 
Join Date: Dec 2005
Location: PA
Default 200VA

How about the 200VA per side. How many watts, amps, and volts would that give me for one channel?
__________________
Is it not better to burn out, than to fade away?
  Reply With Quote
Old 3rd February 2006, 05:38 PM   #9
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
as a rule of thumb, divide the VA by 1.5 to give the maximum power output. 200VA > about 130W.
Decide on the minimum load impedance you want this power to drive. Vpk=sqr rt(P*R*2). Add on some Vrail to Voutput loss, say 6Volts, giving a Vrail = +-(Vpk+6).
Vac = Vrail/1.414

For an 8ohm load then Vac=36Vac to 37Vac.
The unloaded Vrail will be about 8% higher than loaded Vrail and at peak mains incoming voltage you should allow about +6% again or a higher figure if you know the tolerance from your supply company.
This max peak value determines the working voltage of your smoothing caps (63Vdc).
__________________
regards Andrew T.
  Reply With Quote
Old 3rd February 2006, 05:56 PM   #10
croat47 is offline croat47  United States
diyAudio Member
 
croat47's Avatar
 
Join Date: May 2005
Location: Eastern Shore, Maryland
Default Links to Calcs...

Here are some I found that may be useful.

I was thinking of this one as it shows calcs based on what type of filtering, rectification, and transformer you are using.

http://www.atc-frost.com/products/design/va.htm

Step by Step:

http://www.geofex.com/Article_Folder...es/xformer.htm
  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
toroid ID help BeerCan Power Supplies 2 24th May 2011 11:38 PM
Toroid? billbeau Chip Amps 3 4th November 2008 03:26 AM
Trade a 40V 400VA Toroid for 20V 300VA Toroid john65b Swap Meet 7 10th October 2006 03:49 AM
Toroid @ PE troystg Chip Amps 23 20th January 2005 06:50 PM
What amp for this toroid ?? Ford_V6 Solid State 3 5th July 2003 10:53 PM


New To Site? Need Help?

All times are GMT. The time now is 11:27 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