Building a symmetrical psu B1 buffer - Page 171 - 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 11th July 2010, 07:09 PM   #1701
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Next step is 600mA per side then 2A, for enough perceivable niceness. But 200-250mA is the main chunk. Then up it goes diminishing returns.

P.S. Post in 1024x748 links from now on (don't forget to kill the .th in the link else its thumbnails), the server takes refresh to auto resize, and big photos hinder browsing for people on laptops. I am gonna fix the above pics.
  Reply With Quote
Old 11th July 2010, 07:10 PM   #1702
udailey is offline udailey  United States
diyAudio Member
 
Join Date: Mar 2008
Got those big sinks ready?
__________________
purchase LDRs anytime Also try my Resistor Replacers or LDR based Input Selector Email me. diyldr@gmail.com
  Reply With Quote
Old 11th July 2010, 07:13 PM   #1703
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Hey, you can have your buffer, and the feeling (plus electricity bill) of running an F5 with one move!
  Reply With Quote
Old 11th July 2010, 07:17 PM   #1704
diyAudio Member
 
wushuliu's Avatar
 
Join Date: May 2008
Location: Los Angeles
How do I check Vout w/ my DMM? Forgot about that part...
  Reply With Quote
Old 11th July 2010, 07:22 PM   #1705
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
You mean the reg's Vout? You can touch the 3rd pin of the Mosfets nearer to the relay with one probe, the other probe earthed. Or the left most pin of the left audio 2SK then the right most pin of its mate.
  Reply With Quote
Old 11th July 2010, 07:30 PM   #1706
diyAudio Member
 
wushuliu's Avatar
 
Join Date: May 2008
Location: Los Angeles
Quote:
Originally Posted by Salas View Post
You mean the reg's Vout? You can touch the 3rd pin of the Mosfet nearer to the relay with one probe, the other probe earthed.
Yes, thanks Salas!

So would any other changes be required to try 600mA aside from larger sinks?
  Reply With Quote
Old 11th July 2010, 07:32 PM   #1707
Salas is online now Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Just big size sinks. Under 1C/W per pair. You check voltage across Rset and you divide by Rset's value. If it gives 0.6A, then that is what you got.
  Reply With Quote
Old 11th July 2010, 08:05 PM   #1708
pchw is offline pchw  United States
diyAudio Member
 
Join Date: Apr 2006
Location: Fremont, California
From my experiment, the most noticeable improvement was from 60ma to around 120ma. After that, the only thing that I could feel going up was the temp. So, I settled on 140ma. I also found keeping the FETS too cold didn't sound as good as keeping them at 40C and upward. Mine are at 45C inside the (old external SCSI HD) case.
__________________
- Fred -
  Reply With Quote
Old 11th July 2010, 08:10 PM   #1709
diyAudio Member
 
regiregi22's Avatar
 
Join Date: May 2009
Location: Madrid (Spain)
Quote:
Originally Posted by wushuliu View Post
Yes, thanks Salas!

So would any other changes be required to try 600mA aside from larger sinks?
I would place bigger resistors. Imagine you are using 10ohm resistors. That's about 250ma, so 0,625w aprox. We use 5w resistors for long term accuracy.
If you use 500ma with a 5ohm resistor, that's about 1.25W. So I will use something bigger than 5w if possible.
__________________
diyAudio, doing it as big as you can, JUST BECAUSE WE CAN!
  Reply With Quote
Old 11th July 2010, 08:25 PM   #1710
diyAudio Member
 
wushuliu's Avatar
 
Join Date: May 2008
Location: Los Angeles
Quote:
Originally Posted by regiregi22 View Post
I would place bigger resistors. Imagine you are using 10ohm resistors. That's about 250ma, so 0,625w aprox. We use 5w resistors for long term accuracy.
If you use 500ma with a 5ohm resistor, that's about 1.25W. So I will use something bigger than 5w if possible.
Thanks Reg. I'll stick w/ the 10 ohm then. Doesn't sound like there would be much to gain from going lower.
  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
New-building of my B1 buffer Babowana Pass Labs 328 20th February 2010 01:14 AM


New To Site? Need Help?

All times are GMT. The time now is 08:06 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