Where do you buy your toroidal transformers from? - 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 13th July 2012, 07:21 PM   #1
diyAudio Member
 
JohnDeaux's Avatar
 
Join Date: Jul 2012
Location: New Orleans
Default Where do you buy your toroidal transformers from?


Iím building my first chip amp. I guess you could say Iím a ďchip amp virginĒ.
My questions are where do you buy your transformers from?
And
How do you figure out the right size? Do you guesstimate or is there a formula for it? The only specs I have is the volt/amps for the transformer and the total watts for the amp, which is 80 X 2 and 160 X 1. I know the amp has to use more power than that for that output. Iím lost on the transformer size. Iím in the US if that helps.
  Reply With Quote
Old 13th July 2012, 07:49 PM   #2
diyAudio Member
 
Join Date: Aug 2010
What VA did they give you, They must have also given you a voltage.
  Reply With Quote
Old 13th July 2012, 07:56 PM   #3
Marra is offline Marra  United Kingdom
diyAudio Member
 
Join Date: Nov 2009
Location: Near Lincoln
Peter Daniels favours 300VA transformers with either 22 or 25 volt secondaries for his chipamp kits.I think in the US its Plitron [ expensive ] or Antek.
  Reply With Quote
Old 13th July 2012, 07:57 PM   #4
Einric is offline Einric  United States
diyAudio Member
 
Einric's Avatar
 
Join Date: Feb 2011
Location: Bozeman, MT
Default Power Transformers

I have and will continue to use Antek Inc. for power toroids.
Whenever possible I will use the AS- series toroids since they have a mylar static shield between the primary and secondary windings.
If your amp will do 80Wx2 then I would choose AT LEAST a 200VA toroid.
I always kind of figure for 50% efficiency in an amplifier so I take the amout of total watts output and multiply by 2 to get the VA's I need.
With your 160x1 then I would get a 300VA toroid for a monoblock or a 400VA for a stereo pair.
Some may say it is overkill but I would rather have too much than too little if the budget allows.
Antek transformers are designed for 50hz mains power and they say that their transformers will put out 20% more VA's at 60hz that the U.S. has.
In this case I would say that a 300VA toroid would do you just fine since by their logic it should be good for 360VA at 60hz mains power.

To get the volts that you need from the toroid, take the volts the device needs, add 2 volts and divide by 1.414 if you are using full wave bridge rectification.
  Reply With Quote
Old 16th July 2012, 08:29 PM   #5
diyAudio Member
 
JohnDeaux's Avatar
 
Join Date: Jul 2012
Location: New Orleans
Quote:
Originally Posted by powerbob View Post
What VA did they give you, They must have also given you a voltage.
The VA was listed on the different torrids I looked at, the 26 volts was listed on the amp board.
  Reply With Quote
Old 16th July 2012, 10:21 PM   #6
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
This company will ship them to your door. The price includes shipping. With the transformer kit you can wind whatever voltage you need. It comes with the information as to wire size and V/turn data. Also it comes with polyproylene film tape to insulate the secondary after you wind it and mounting hardware. With the kit, you can easily add an auxilary seconday to power op-amps and control circuitry.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 16th July 2012, 10:30 PM   #7
mattmcl is offline mattmcl  United States
diyAudio Member
 
Join Date: Apr 2009
Location: Erie, CO
I favor Antek as well. Their sister company, Par-Metal makes nice chassis too.
  Reply With Quote
Old 11th April 2013, 01:44 PM   #8
diyAudio Member
 
Join Date: Jan 2008
If I can just ask a question here than start a new thread - anyone know where I can get Thai Lin transformers? My Meier Corda Cantate.2 blew its TL99-0100-030 encapsulated transformer last week, which I suspect is my faulty voltage regulator that just blew the amp on my active monitors a few hours ago.

Dr. Meier told me there's a Talema equivalent also as the pin placements are identical, but I have to be honest, I'm no engineer so I can't even tell what indicates their sizes (it's a tight fit on the amp's PCB so it has to be an exact fit). I couldn't find any Thai Lins on Mouser or even through Google; I came across some Talemas but even if its the same size the output specs are different.

Also, as I am not an engineer, my amp was diagnosed by the tech of a local hi-fi store. They have a network for parts, but none of these; they're more into tubes - whose transformers of course are huge although they can direct me to a local company that makes custom transformers even on small orders, as well as a guy who does custom-wound audio-grade transformers for DIY tube amps. However, I'd rather get either the original Thai Lin or the Talema equivalent.

Anyone know where I can find the replacement transformer online? I live in the Philippines but I can buy from the US and have it shipped to California where friends can ship it to me along with other audio equipment we don't get locally (this time mostly parts), or maybe better, fly in with them in their carry-on luggage. (Yeah, the FAA, but from my experience they opened up my check-in bag since a PCB showed up on the X-Ray, so we'd all rather have them on hand and not have anyone drop them while going through bags)
  Reply With Quote
Old 11th April 2013, 03:06 PM   #9
diyAudio Member
 
Join Date: Dec 2009
Send a message via Yahoo to Lil Knight
A pic of that blown transformer would help identify the correct replacement.
__________________

  Reply With Quote
Old 11th April 2013, 04:54 PM   #10
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by lil' knight View Post
A pic of that blown transformer would help identify the correct replacement.
Oh I thought a part number would be sufficient. They were about to close shop at the time so I just took a quick snapshot with my smartphone; will drop by this weekend to pick up the blown transformer.

Click the image to open in full size.
  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
where to buy toroidal transformers onlne roofingboom Solid State 11 31st March 2012 11:57 AM
Group Buy: SST03 Soft start for toroidal transformers peranders Group Buys 27 18th June 2011 09:59 AM
Are toroidal transformers best? walker Solid State 43 15th September 2006 02:21 PM
Best Transformers (Encapsulated Toroidal or Open Frame Toroidal) Rixsta Pass Labs 10 23rd April 2004 03:41 AM
Toroidal Transformers jhead Chip Amps 3 8th March 2004 07:58 AM


New To Site? Need Help?

All times are GMT. The time now is 04:07 AM.


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