Transformer specs? - Page 4 - 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 24th May 2013, 11:38 PM   #31
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
just a guess, about 75va...
  Reply With Quote
Old 25th May 2013, 05:04 PM   #32
diyAudio Member
 
Join Date: May 2013
how many volts do you want the power supply for your gainclone circuit? If you are trying to draw more than 12 volts, you probably need another transformer because it looks way too small. What are the dimensions?
  Reply With Quote
Old 25th May 2013, 06:29 PM   #33
diyAudio Member
 
Join Date: May 2013
Quote:
Originally Posted by Davis Lambert View Post
how many volts do you want the power supply for your gainclone circuit? If you are trying to draw more than 12 volts, you probably need another transformer because it looks way too small. What are the dimensions?
Legth: 11cm
Hight: 5cm
With: 8cm

I was thinking about 15-20. Could it then maybe be used in a dual mono amp?

Thanks

Last edited by TroelsG; 25th May 2013 at 06:34 PM.
  Reply With Quote
Old 25th May 2013, 08:24 PM   #34
diyAudio Member
 
Join Date: May 2013
The measurements are ok, although if you are drawing a lot of current then you would need a bigger one
  Reply With Quote
Old 29th May 2013, 01:51 PM   #35
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Testing the VA rating of the secondaries is difficult to do accurately and several people have their own ways of approximating what the original design was capable of. In the case of a single secondary you can often use the datasheets of other transformers with similar weight to give you some idea. With multiple secondaries it's down to experimentation.

My method is to load up each secondary until the voltage starts to drop, at the same time making sure that the transformer is still running cool. Ultimately the transformer will fail if any winding overheats.

With a transformer designed to provide driver stages with a higher voltage than the output stages, I would start by seeing what the High Current windings can provide. These can normally be spotted by the thicker secondary wires.

Last edited by KatieandDad; 29th May 2013 at 01:54 PM.
  Reply With Quote
Old 29th May 2013, 09:22 PM   #36
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
Quote:
Originally Posted by TroelsG View Post
Legth: 11cm
Hight: 5cm
With: 8cm

I was thinking about 15-20. Could it then maybe be used in a dual mono amp?

Thanks
are these measurements of the iron(not including the coils)?
if it is, and the 1.7 kg weight tells me you have a fairly sized traffo
good enough for a gainclone....
  Reply With Quote
Old 19th July 2013, 04:11 PM   #37
Jsixis is offline Jsixis  United States
diyAudio Member
 
Join Date: Feb 2011
Location: Columbus Ohio
Quote:
Originally Posted by AndrewT View Post
The bulb tester allows you to safely power up mis-wired primaries.
it is in my view an indispenable tool.

A dual primary or multitapped primary is potentially the most dangerous bit of kit us experimenters can get a hold of.
The bulb tester solves the danger bit.
It even prevents the blown fuse.
I do not test any transformer without a dim bulb tester. I use to, then 1 day I hooked up 120 to a transformer only to learn it was a choke. I fried my power strip, ruined my simpson analog multi meter and arc flashed my eyes.
My dim bulb tester was 2 feet away.

The same thing can happen if the transformer is shorted.
  Reply With Quote
Old 20th July 2013, 08:33 AM   #38
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
When I joined this Forum, the dim bulb tester (mains bulb tester) did not seem to ever get mentioned.

I asked how to check that the phasing of a dual primary could be wired up safely.
No one came in to suggest using the bulb tester.

It was some years later that I came across this safe method.
I have championed this safe method ever since.

But it does have limitations.
It cannot be used to adjust the output bias of power amplifier.
It does not protect an amplifier that is currently powered up with the smoothing fully charged and a slipped test probe shorts out a critical pair of traces/joints/device legs.
__________________
regards Andrew T.
  Reply With Quote
Old 20th July 2013, 12:51 PM   #39
AJT is offline AJT  Philippines
diyAudio Moderator
 
AJT's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
i build my own traffos...i never used a bulb tester, a simple dmm is all i needed...
  Reply With Quote
Old 21st July 2013, 08:05 AM   #40
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
AJT,
are you instructing the Membership to never build and never use a mains bulb tester?
__________________
regards Andrew T.
  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
transformer specs magelord04 Power Supplies 3 1st August 2007 04:19 PM
Transformer Specs cammy666 Tubes / Valves 1 25th June 2007 09:47 PM
Transformer Specs Gunny Instruments and Amps 1 17th January 2007 05:52 AM
getting the specs on a transformer pango Tubes / Valves 4 18th December 2006 01:39 PM
looking for transformer with the following specs? matthew2456 Tubes / Valves 4 22nd August 2006 09:58 PM


New To Site? Need Help?

All times are GMT. The time now is 11:25 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