Neg rail voltage on two pads? - Page 2 - 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 25th July 2012, 08:31 PM   #11
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I need the voltages from the 14 pin header on the audio driver board, not from the power supply driver ICs.
  Reply With Quote
Old 26th July 2012, 02:33 AM   #12
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
All 14 pins have between -106.6VDC and -115VDC when I put the black probe on the secondary winding ground and the red prob on the pins.
  Reply With Quote
Old 26th July 2012, 08:40 AM   #13
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Look at the schematic that I sent you. the voltages are given on the amp page.
  Reply With Quote
Old 26th July 2012, 01:23 PM   #14
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
In looking at the readings I should have, I figured I must have been doing something wrong...

After some more studying your tutorial, I decided to try using the negative rail source pad closest to the audio section as the reference to ground. Now I have the following voltages.

Pin 1: 8.600vdc *
Pin 2: 8.700vdc *
Pin 3: 3.400vdc *
Pin 4: 8.800vdc *
Pin 5: 5.400vdc *
Pin 6: 3.200vdc *
Pin 7: 0.001vdc
Pin 8: 8.900vdc *
Pin 9: 12.50vdc *
Pin 10: 1.620 to 3.100vdc *
Pin 11: 0.003vdc
Pin 12: 2.100vdc *
Pin 13: 2.100vdc *
Pin 14: 13.98 vdc

All pins with a "*" fluctuate rapidly several point volts to nearly 1v... what could be causing this?

If I'm reading that schematic you sent me right, I should have 12v +&-, 15v +&- on 4 of them pins? Where are those voltages regulated from?

Last edited by Deadly Sones; 26th July 2012 at 01:30 PM.
  Reply With Quote
Old 26th July 2012, 02:16 PM   #15
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
I also took the readings from what I believe to be the dual op amp.

Pin 1: 0.051 *
Pin 2: 115.9
Pin 3: 116.1
Pin 4: 0.044 *
Pin 5: 0.001 *
Pin 6: 7.1 - 9.2 *
Pin 7: 0.095 *
Pin 8: 14.00

Again all readings are with the neg probe on the source pad of the neg rail closest to the audio section. Voltages with "*" are fluctuating slightly except for pin 6 that one fluctuates greatly.

Last edited by Deadly Sones; 26th July 2012 at 02:36 PM.
  Reply With Quote
Old 27th July 2012, 12:01 AM   #16
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
It doesn't appear that the main power supply is producing rail voltage. Do you have positive and negative rail voltage?
  Reply With Quote
Old 27th July 2012, 12:50 AM   #17
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
Yes, I think so. The results are posted in my first post.

Last edited by Deadly Sones; 27th July 2012 at 12:56 AM.
  Reply With Quote
Old 27th July 2012, 12:59 AM   #18
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You need to confirm that that's still the case. Pin 8 should be very near -120v DC.
  Reply With Quote
Old 27th July 2012, 02:07 AM   #19
diyAudio Member
 
Deadly Sones's Avatar
 
Join Date: Feb 2011
Location: Windsor, Ontario
yes. I have -116.3 on the source and -115.5v on the gate. Placing the - probe on the center tap and + on the pads. I double checked the voltages on pin 8 too... it was the same. I put the neg probe on the source pad of the first neg rail pad.

Last edited by Deadly Sones; 27th July 2012 at 02:20 AM.
  Reply With Quote
Old 27th July 2012, 02:25 AM   #20
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
If you mean that it's the same as you posted (8.9v), you need to determine why pin 8 doesn't have negative rail voltage.

Confirm that one of the secondary center taps of the small transformer are directly connected to the negative rail.

Do the various audio op-amps have positive and negative regulated voltage on their power supply pins?
  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
s150 blown neg rail fuse joegio Pass Labs 8 6th February 2013 01:33 AM
Neg Rail on JLH Amp Output john65b Solid State 23 13th January 2012 02:45 AM
F5 loaded rail-to-rail voltage? CanAm Man Pass Labs 40 20th March 2011 08:43 PM
Can 555 circuit supply enough neg voltage graygem Analog Line Level 1 1st March 2011 06:19 PM
Rail voltage compared to transformer voltage SteveG Solid State 4 23rd July 2002 12:50 AM


New To Site? Need Help?

All times are GMT. The time now is 11:32 AM.


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