Building a symmetrical psu B1 buffer - Page 241 - 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 February 2012, 03:43 PM   #2401
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by buzzforb View Post
Any benefir to using v rated parts in dcb1?
No, they may even cause self heating problems.

Quote:
Originally Posted by KatieandDad View Post
I've heard of V rated tyres for cars but never V rated components ???
He just means Violet grade (highest IDSS group in Toshiba's literature, BL is BLue) I suppose.
  Reply With Quote
Old 7th February 2012, 03:57 PM   #2402
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Quote:
Originally Posted by Salas View Post
Not far.

Sorry but "Not Far", what do you mean ?
  Reply With Quote
Old 7th February 2012, 03:58 PM   #2403
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
I can certainly measure them again with the 2SK170BL as a CCS.

The minor differences between different 2SK170s must surely be similar to the circuit that I used.

Obviously the ULTIMATE measurement must be with the particular 2SK170 that you are using with each LED string.

I suppose this is what makes this amplifier impossible to produce commercially.

Last edited by KatieandDad; 7th February 2012 at 04:01 PM.
  Reply With Quote
Old 7th February 2012, 04:08 PM   #2404
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Quote:
Originally Posted by KatieandDad View Post
Sorry but "Not Far", what do you mean ?
I mean its not far from real conditions. Best accuracy for finding their Vf in circuit would be to use their real K170 destined to power them in the build of course. To produce such a buffer in the way some meticulous members put it together in this thread, forget it cost wise indeed.
  Reply With Quote
Old 7th February 2012, 04:29 PM   #2405
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Salas View Post
No, they may even cause self heating problems.



He just means Violet grade (highest IDSS group in Toshiba's literature, BL is BLue) I suppose.
Wouldnt it just amount to lower output impedance. Beimg 100% feedback already, you wouldnt get better distortion numbers, correct.
  Reply With Quote
Old 7th February 2012, 04:57 PM   #2406
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Problem is their self dissipation. Would need some special TO-92 double sink to help them and lock their drift by coupling their temp in pairs. Buffer's Zo is limited by the necessary output series resistor anyway, but the more conductance the less THD of course. Also the more Ciss unfortunately, maybe 10K pot max if like that with K170V in the audio part. Not good in the PSU part due to capacitance and drift.
  Reply With Quote
Old 7th February 2012, 05:07 PM   #2407
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Cool! Thanks.
  Reply With Quote
Old 8th February 2012, 07:04 AM   #2408
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Speaker manufacturers have been selecting measured components for decades.

Every driver gets measured. Every critical crossover component gets measured. The computer then "cherry picks" the combination of drivers and components to get the final speaker within that model's tolerance range.

This could easily be applied to a simple amplifier.
But is there a market for tens of thousands that the computer could send out?
__________________
regards Andrew T.
  Reply With Quote
Old 9th February 2012, 03:02 PM   #2409
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
SALAS could you possibly PM me the Silk Screen for the attached board so that I can transfer it onto my HomeBrew board.

Many Thanks

Andy
Attached Images
File Type: jpg BluePartsSide-Small.jpg (116.2 KB, 256 views)
  Reply With Quote
Old 9th February 2012, 04:15 PM   #2410
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
I'm just waiting for the PSU caps and a back order of 2SK170BLs before I start building.
  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 07:06 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