DIY bass transformer for ESLs ? - Page 4 - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 8th April 2011, 05:20 PM   #31
diyAudio Member
 
kavermei's Avatar
 
Join Date: Jan 2005
Location: Lokeren, Belgium
Send a message via MSN to kavermei
Oil burner ignition trafos, really?? I never would've thought of that... I like the idea!!

I wonder, do they have a magnetic shunt like neon sign transformers (for limiting the short-circuit current)...? I guess not, given their purpose. Good!

Do they get hot?

Kenneth
__________________
Never send a human to do a machine's job. --Agent Smith
  Reply With Quote
Old 8th April 2011, 08:51 PM   #32
SM7UYJ is offline SM7UYJ  Sweden
diyAudio Member
 
SM7UYJ's Avatar
 
Join Date: Dec 2004
Location: Staffanstorp
I do not think there is any shunt, and as they are marked "Intermitent - use only 30% off 3min cycle" - I would guess not!

I've only tested them, so I do not know if they run hot - will do some more tests during this weekend!

Roger
__________________
The probability of someone watching you is proportional to the stupidity of your action.
- A. Kindsvater
  Reply With Quote
Old 8th April 2011, 10:56 PM   #33
diyAudio Member
 
bolserst's Avatar
 
Join Date: Jun 2005
Location: Fort Worth, Texas
Quote:
Originally Posted by kavermei View Post
Oil burner ignition trafos, really?? I never would've thought of that... I like the idea!!

I wonder, do they have a magnetic shunt like neon sign transformers (for limiting the short-circuit current)...?
I believe oil burner transformers come in 3 different types.

1) the heaviest/oldest ones are not current limited.
2) but, some models are current limited with a magnetic shunt, (20mA - 40mA usually).
3) the most recent/cheapest models are solid state(transformer replacements) and are not usable for ESL step-up transformers.

My guess would be if they say "intermittent use" they are probable not current limited.
But since you will only be applying at most 30Vrms - 40Vrms to the 220V winding you shouldn't run into any overheating problems.

With their high leakage inductance and primary winding resistance they should provide a nicely damped low pass filter for bass panels without needing any additional parts

Last edited by bolserst; 8th April 2011 at 11:24 PM.
  Reply With Quote
Old 9th April 2011, 06:15 PM   #34
diyAudio Member
 
kavermei's Avatar
 
Join Date: Jan 2005
Location: Lokeren, Belgium
Send a message via MSN to kavermei
Thanks for the information Bolserst.

Quote:
Originally Posted by bolserst View Post

3) the most recent/cheapest models are solid state(transformer replacements) and are not usable for ESL step-up transformers.
As I feared... Microwave oven transformers are going the same direction. (Not that they're much use for audio anyway.)

Kenneth
__________________
Never send a human to do a machine's job. --Agent Smith
  Reply With Quote
Old 10th April 2011, 07:26 AM   #35
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
Ya know? I did touch on the Idea of using an MOT last year. jer
  Reply With Quote
Old 11th April 2011, 12:09 AM   #36
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
Also MOT's generaly only have a stepup ratio of 1:20 to 1:25.
And of all of the ones that I have tore apart I yet to have two Identical transformers.
Never the less it is still a good Idea. jer
  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 you buy iron transformer core for DIY audio transformer tarsik Tubes / Valves 10 27th December 2011 08:15 PM
Changing bass amp output transformer Leb Tubes / Valves 8 27th September 2010 10:28 PM
Wind my own output transformer for 100w bass amp audiojerk Tubes / Valves 18 16th May 2008 02:35 PM
need Acoustat bass transformer... moray james Planars & Exotics 2 15th February 2007 07:22 PM
chip recomendation for a bass guitar amp (already got a transformer). facundonu Chip Amps 1 25th October 2006 06:55 PM


New To Site? Need Help?

All times are GMT. The time now is 11:21 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