Building a symmetrical psu B1 buffer - Page 105 - 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 6th March 2010, 04:07 PM   #1041
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Sugden & Regiregi, well done. Cheers.

Regi, what massimo said about pd.
  Reply With Quote
Old 6th March 2010, 04:36 PM   #1042
diyAudio Member
 
regiregi22's Avatar
 
Join Date: May 2009
Location: Madrid (Spain)
Then I think I will have to re-check resistors wattage of some other circuits I have designed
  Reply With Quote
Old 6th March 2010, 04:44 PM   #1043
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Yes if you want them to show a long life without servicing needs. Same with semiconductors. Haven't you noticed how Papa over specifies power Mosfets in Class A amps? There they dissipate constantly enough like DC warmed up resistors.

P.S. Tell us more about your system configuration and what you replaced with DCB1, and the sonic footprint. Maybe even a picture if you may.
  Reply With Quote
Old 6th March 2010, 06:07 PM   #1044
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
Salas,

I don't know if I have MKP, but I would have a good selection of nice PP film caps to try - is it worthwhile doing this, or is it only worthwhile with the MKP only?

Fran
  Reply With Quote
Old 6th March 2010, 06:23 PM   #1045
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Worthwhile with any film cap. Just try it and tell me your opinion.
  Reply With Quote
Old 6th March 2010, 09:49 PM   #1046
diyAudio Member
 
Join Date: Jan 2006
Location: Ireland
And is it the bigger the better (i.e. bigger uF)?

Fran
  Reply With Quote
Old 6th March 2010, 10:02 PM   #1047
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
Yes, a bit better for some filtration. If you find it worthwhile you can find your best type and value. We are not doing engineering now, we try to subjectively evaluate some little chemical cap distortion VS some little more noise on the Vref. Just do your most handy.
  Reply With Quote
Old 7th March 2010, 11:59 AM   #1048
paul.42 is offline paul.42  United Kingdom
diyAudio Member
 
Join Date: Jul 2007
Default psu boards

can we run psu boards before the hypnotize boards or not.
  Reply With Quote
Old 7th March 2010, 01:43 PM   #1049
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
No.
  Reply With Quote
Old 7th March 2010, 05:46 PM   #1050
diyAudio Member
 
regiregi22's Avatar
 
Join Date: May 2009
Location: Madrid (Spain)
Well, I'm not very well at listening, but I have noticed more punch and more defined bass tones. Especially in drums or in the slap of an upright bass. I haven't give it a serious listening yet, only while doing other things.

It is connected to a gainclone LM3886 with a regulated PSU. It's been made from carlosfm's schematics, both amp and PSU.
My source are not the best, mainly mp3 and cds, played on the PC through a modded EMU 0404USB, wich has been changed to better electrolytics caps. I still have to change the output opamps to better ones.

This is my DCB1. I dont plan to make it look better or painting it, my mainly end is trying to get best sound. I finished that DIY stepped attenuator last week, it's 20k. I found a bargain at ebay, a 24 steps double rotary switch for 10$ shippment included, so I had to bought the Dales from mouser. It is internal wired with single core cat5e wires. It has placed underneath an output cap for the delay-start regulator. Pannasonic FM and Nichicon Audio KW capacitors, Dale and Takeman resistors. An all-steel chassis construction.

It sounds excepcionaly clean, putting my ear near the cone at max vol I cannot hear even a slight hum from it. It was substituting nothing, I was controlling the volume with the pot of the emu0404. I plan to bypass it with a wire, it doesnt seem to be good enought for the task.
Attached Images
File Type: jpg IMGP1385.JPG (959.7 KB, 473 views)
File Type: jpg IMGP1386.JPG (963.3 KB, 403 views)
File Type: jpg IMGP1387.JPG (669.3 KB, 369 views)
File Type: jpg IMGP1389.JPG (619.6 KB, 390 views)
File Type: jpg IMGP1391.JPG (587.5 KB, 359 views)
  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 07:25 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