dodgy amp power supply - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

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
Thread Tools Search this Thread
Old 9th January 2008, 09:50 AM   #1
diyAudio Member
Join Date: Jan 2008
Default dodgy amp power supply

I've recently purchased a second hand power amp. After setting it all up i found it would powerup but produced no sound, so being the type of guy I am I opened it up.

When I opened it I found that the fuses on the DC rails had blown so i replaced 'em. The new fuses promptly blew the next time I turned it on. Testing revealed that there was >100A(as high as my multimeter would go) between the fuse contacts, slightly more than to 10A indicated for the fuses.

I suspect the culprit to be a capacitor between the AC inputs to the bridge rectifier, which seems rather peculiar. I tested the rectifier and it appears to be working fine. The AC from the transformer is fine, I can only find an issue after it's converted to DC.

I'll try to get a picture up as soon as I can, if you guys think it'll help. thanks for any help
  Reply With Quote
Old 9th January 2008, 10:12 AM   #2
acid_k2 is offline acid_k2  Italy
diyAudio Member
Join Date: Oct 2006
There is a short circuit
check wires
check power transistors/mosfets in audio amplifier section
  Reply With Quote


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
dodgy PSU capacitor AndrewT Parts 15 8th July 2011 03:53 AM
CD With dodgy low frequencies ... mart34 Multi-Way 5 12th July 2009 05:01 AM
dodgy volume control nutta88 Solid State 0 2nd April 2008 08:02 PM
'Dodgy' tap water ash_dac The Lounge 14 8th March 2006 03:18 PM
Dodgy amp needs repair sbattersby 115 Instruments and Amps 13 29th April 2005 10:33 AM

New To Site? Need Help?

All times are GMT. The time now is 08:10 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright 1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2