Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 November 2009, 02:15 AM   #1
diyAudio Member
 
astouffer's Avatar
 
Join Date: Jun 2004
Location: Pittsburgh, crumbling wasteland
Default Bad day to be a capacitor

A buddy at work gave me a SoundTech mixer/amp to take a look at because it stopped working. The fuse was good but no continuity to the power transformer. The power switch is intermittent but luckily its a DPDT switch and only one side is wired. But anyhow when I started looking over the main amplifier board I spotted this freaky looking cap. The insides just look exploded out A nearby wire has the insulation charred black from the heat!


Click the image to open in full size.

Click the image to open in full size.



Hopefully the blown cap and bad power switch are all thats wrong with this thing...
  Reply With Quote
Old 13th November 2009, 03:00 AM   #2
anatech is offline anatech  Canada
diyAudio Moderator
 
anatech's Avatar
 
Join Date: Jun 2004
Location: Georgetown, On
Hi astouffer,
Cool, a capacitor wearing a "dunce hat".

I've seen many like this over the years. Your power switch is probably the fault, but some power supply components may have suffered from the high noise coming from the arcing power switch.

What really helps is an MOV placed across the transformer primary. Right across the leads. If it shorts, the fuse will blow. The MOV will clamp the voltage spikes occurring when you turn the unit off. This will greatly prolong the life of the switch contacts.

-Chris
__________________
"Just because you can, doesn't mean you should" my Wife
  Reply With Quote
Old 13th November 2009, 05:26 AM   #3
wwenze is offline wwenze  Singapore
diyAudio Member
 
Join Date: Mar 2008
Ooooo so that's how the inside of a capacitor looks like.

Judging from the packaging, metal film?
  Reply With Quote
Old 13th November 2009, 08:04 AM   #4
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default That's the very first time i see this in 58 years

I could find leakage in those green ones, also errors in capacitance, also numbers not clear to read, but never exploded that way.

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
  Reply With Quote
Old 13th November 2009, 04:02 PM   #5
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Looks like something out of Aliens!!
  Reply With Quote
Old 13th November 2009, 04:21 PM   #6
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
First film cap I've seen fail this way in nearly 40yrs of tinkering, and a 30+ yr career. Pretty cool
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 13th November 2009, 04:24 PM   #7
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Looks alike an Allien Sting

Very interesting..first time i have the chance to see that.

regards,

Carlos
__________________
Dx Blame ST with a tube preamp. recorded with Xperia cell phone, https://www.youtube.com/watch?v=Qjs32J0gdj0; https://www.youtube.com/watch?v=nhrZ...vDnDhEpNv_XVxg
  Reply With Quote
Old 13th November 2009, 05:01 PM   #8
albin is offline albin  United Kingdom
diyAudio Member
 
Join Date: Aug 2008
Default Great picture

Instant Millimetric Waveguide Fluxcapacitor
....Great Scott!!!!!!!
I'm off to the shed
regards Max

Last edited by albin; 13th November 2009 at 05:03 PM.
  Reply With Quote
Old 13th November 2009, 05:55 PM   #9
diyAudio Member
 
tiefbassuebertr's Avatar
 
Join Date: Jul 2005
Location: D-55629 Schwarzerden
very interesting!
such kind of destroy I know primarily from electrolytic capacitors, e. g.
http://farm4.static.flickr.com/3309/...0f18f1e736.jpg
There are many counterfeits, not only by semiconductors.
to find more photos about destroy caps, please fill in the term (key word) "bad caps" by google and use the image search
  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
BEC Capacitor ID wrenchone Parts 1 4th November 2013 03:48 AM
How to use this capacitor? commstech Parts 4 27th March 2009 03:47 PM
Capacitor value dstockwell Tubes / Valves 9 21st September 2005 12:17 AM
capacitor FABIO_IT61 Parts 1 29th July 2005 04:12 PM
capacitor uvodee Parts 4 12th April 2004 05:23 AM


New To Site? Need Help?

All times are GMT. The time now is 08:14 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