red hot transformer? - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 12th December 2007, 06:52 PM   #1
marko is offline marko  United Kingdom
diyAudio Member
 
Join Date: May 2004
Location: donnyuk
Default red hot transformer?

what would cause this? a short i guess? the amp actually works for a bit untill my power supply trips out and the cables get warm too in the process!!
  Reply With Quote
Old 12th December 2007, 07:27 PM   #2
jol50 is offline jol50  United States
diyAudio Member
 
Join Date: Nov 2007
Transformer shorted?
  Reply With Quote
Old 12th December 2007, 07:29 PM   #3
marko is offline marko  United Kingdom
diyAudio Member
 
Join Date: May 2004
Location: donnyuk
i'll have a poke around, could be this as some of the anodising on the transfomer wiring is slightly scorched....
  Reply With Quote
Old 12th December 2007, 08:13 PM   #4
shagone is offline shagone  United States
diyAudio Member
 
Join Date: Apr 2007
Quote:
Originally posted by marko
i'll have a poke around, could be this as some of the anodising on the transfomer wiring is slightly scorched....

try twisting with something while you play music and see if it comes and goes. look for a powdery substance between the shorted windings. they often short where the leads bend down to go into the board. if you can find the short you may be able to isolate it with kapton tape or new epoxy.
  Reply With Quote
Old 13th December 2007, 11:07 PM   #5
diyAudio Member
 
Join Date: Nov 2007
Might your amp be suffering from simultaneous conduction in the transistors (FETs on my amps) that drive the transformer's primary? If so, this could be caused by a damaged gate drive circuit or by the use of replacement FETs having larger gate to source capacitances than the drive circuit was designed for.
  Reply With Quote
Old 15th December 2007, 03:25 PM   #6
marko is offline marko  United Kingdom
diyAudio Member
 
Join Date: May 2004
Location: donnyuk
this is the amp, it's a bbg ryval by phoenix gold, it play fine for a few minutes then the transformer gets too hot to touch, i've ohmed all the devices out and they seam fine....

also the trasformer starts to very slightly smoke!!
Attached Images
File Type: jpg dscn2477.jpg (86.6 KB, 232 views)
  Reply With Quote
Old 15th December 2007, 10:02 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Pull the rectifiers out of the circuit. If the current draw remains high, you know the problem is in the supply. If the current draw goes down to ~1 amp, the problem is in the audio section.

After pulling the rectifiers, you need to put the board back in the sink and clamp the transistors down tightly. High current draw will destroy parts in seconds if they're not clamped to the sink.
  Reply With Quote
Old 22nd June 2008, 05:21 PM   #8
marko is offline marko  United Kingdom
diyAudio Member
 
Join Date: May 2004
Location: donnyuk
hi all, i just got round to looking at this again as it's sunday and i'm board!

i pulled the rectifiers out and powered it up, within seconds the transformer was too hot to touch!! i didn't do a current draw check but i'm certain it would be high still...

do i have a shrorted transformer? i guess the only way to tell is to pull the transformer and do continuity tests..
  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
Using mains transformer as output transformer Elias Tubes / Valves 176 11th March 2013 09:35 PM
Modulation transformer for a driver transformer? ironradio Tubes / Valves 6 28th December 2008 05:05 PM
filament transformer vs plate transformer contaxchen Tubes / Valves 10 14th January 2005 10:43 AM
toroid Transformer as power Transformer for tube tone Tubes / Valves 7 11th February 2003 08:57 AM
toroid Transformer as output Transformer for tube preamp? tone Tubes / Valves 15 2nd February 2003 04:36 AM


New To Site? Need Help?

All times are GMT. The time now is 12:29 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