Pearl Two - Page 50 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 7th September 2010, 10:25 PM   #491
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Are you going to play Tainted Love on that all day long?
  Reply With Quote
Old 8th September 2010, 04:36 AM   #492
mlloyd1 is offline mlloyd1  United States
diyAudio Member
 
mlloyd1's Avatar
 
Join Date: Feb 2001
Location: illinois
so, has anybody finished building yet?

mlloyd1
  Reply With Quote
Old 8th September 2010, 08:03 PM   #493
diyAudio Member
 
Join Date: Jan 2010
Just a dumb question. Are 1/8 watt resistors adequate? Also, does anyone have any specific advise about what caps to use. Any assistance will be greatly appreciated. Thanks.
  Reply With Quote
Old 8th September 2010, 10:44 PM   #494
diyAudio Member
 
Join Date: May 2010
Default Pearl Two Problem

Guys, just finished the pearl two using Pass boards and I have a problem.

Power supply is in a separate box. It checked out ok. But when I connect it to the circuit chassis strange things happen. On turn on things sound fine but within a couple of minutes the volume fades away.

When I checked out the voltages, the positive supply rail at R4 starts dropping from 24.06 volts to around 5.74 volts in about two minutes. The negative rail goes up to 62.1 volts.

This happens with both boards whether one or both are connected to the power supply.

Any suggestions? I have checked the layout and it looks ok. I'm not a techie so I'm a little lost.

Thanks
Rudy
  Reply With Quote
Old 8th September 2010, 11:04 PM   #495
Tea-Bag is offline Tea-Bag  United States
not politcally affiliated
diyAudio Member
 
Tea-Bag's Avatar
 
Join Date: Feb 2006
Location: Kennebunk
Blog Entries: 7
DC offset?
__________________
Salas Boards 2014 #2 On order |F5TC board and power supplies available PM | Hot-Rod DCB1 boards and kits available PM |Mesmerize kits available (no boards)
  Reply With Quote
Old 8th September 2010, 11:20 PM   #496
diyAudio Member
 
Join Date: May 2010
Default DC offset

Around 30mv at the P1 test point and 1mv at the output.
  Reply With Quote
Old 8th September 2010, 11:26 PM   #497
gotoma8 is offline gotoma8  United States
diyAudio Member
 
Join Date: Apr 2006
Location: SF/Bay Area
Default Question...about listing...

Those interested, I've listed in the "Swap Meet" a set of Pearl 2 boards I got, with matching FETs. If interested, pleaes let me know.
Thanks
T
  Reply With Quote
Old 9th September 2010, 01:12 AM   #498
BDP is offline BDP  United States
diyAudio Member
 
Join Date: Apr 2002
Location: SE Washington State
What's the voltage at the regulator input?
  Reply With Quote
Old 9th September 2010, 01:28 AM   #499
diyAudio Member
 
Join Date: May 2010
Default Pearl two issue

Starts off at +24 volts then drops to +5.74v, starts at - 24 and increases to -62.1v. Takes less than 90 sec to do this. Also noticed some popping sounds during this period.

Thanks
Rudy
  Reply With Quote
Old 9th September 2010, 01:33 AM   #500
diyAudio Member
 
Join Date: May 2010
Default Correction

Sorry, at power on, the input to regulators is + and - 35 volts. It changes to the 5 and -64 volt quickly.
  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
Another diy-pearl... lykkedk Pass Labs 18 15th June 2007 04:44 PM
ono or pearl PCB's mantisory Pass Labs 1 28th September 2006 11:12 PM
Pearl need help dzkh63 Pass Labs 1 26th September 2006 03:16 PM
WTB: Pearl PCB aire Pass Labs 1 26th February 2006 10:51 AM


New To Site? Need Help?

All times are GMT. The time now is 07:10 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