What the heck have I done..!? - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 August 2004, 02:45 AM   #1
lazyfly is offline lazyfly  Australia
diyAudio Member
 
Join Date: Jun 2004
Location: Melbourne
Default What the heck have I done..!?

Hi forum.

I've wired up the + - rails on a BrianGT GC and all rail voltages are spot on (25+25 transformer - 36V rails on both modules).

Now, one channel produces 58mV at the output whereas the other channel is producing 35.5V!!!!! What the?

Please help
  Reply With Quote
Old 24th August 2004, 03:22 AM   #2
lazyfly is offline lazyfly  Australia
diyAudio Member
 
Join Date: Jun 2004
Location: Melbourne
hmmm, don't know if this will help but measuring in Ohms across pins 3 & 8 (nfbr) I get 21.9k and the working channel is the same. When I measure across pins 3 & 7 I get 0k on the dodgey chan and 44.5k on the working channel.
  Reply With Quote
Old 24th August 2004, 05:15 AM   #3
aHobbit is offline aHobbit  Philippines
diyAudio Member
 
Join Date: Jun 2004
Location: Quezon City
If you get 0 ohm between pin3 and pin7, it looks like you have a short circuit between pin 3 and the V+ rail of your supply. Thus, you will have 35.5Vdc at your speaker output terminal.

check carefully that no stray wire or whatever connects your V+ and the pin3.

regards.
  Reply With Quote
Old 24th August 2004, 09:27 AM   #4
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
 
Nuuk's Avatar
 
Join Date: Feb 2003
Location: Somerset, SW England
This is also a symptom of one 'broken' rail. So check that you have the correct voltages on each pin of the chip.
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  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
Who the heck is Dr Watson? bulgin Everything Else 9 2nd November 2008 01:31 AM
UL-01AN what the heck is it? banana Chip Amps 6 3rd June 2007 03:32 PM
Where the heck?? Kengro Multi-Way 3 5th March 2004 06:26 AM
Aw, Heck Bill F. Introductions 12 24th April 2002 07:17 AM


New To Site? Need Help?

All times are GMT. The time now is 11:00 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