Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

Sony VFET Amplifier Part 2
Sony VFET Amplifier Part 2
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 9th February 2018, 07:37 PM   #3491
luvdunhill is online now luvdunhill  United States
diyAudio Member
 
luvdunhill's Avatar
 
Join Date: Jul 2006
Quote:
Originally Posted by dsdjoy View Post
Just opened the Gerbers. They are the single-pair output version.
I am interested in the two-pair output version as well.
Quote:
Originally Posted by WalterW View Post
Ah, then that's causing the confusion. If I remember right, Nelson has posted the gerbers for the 4 output version also, some time ago. Haven't found it in this big thread yet.
Quote:
Originally Posted by vvs07 View Post
Maybe we can ask Tea-bag to run another group buy of the boards.
I have some three output versions of an output stage that can be used in all the VFET designed posted.

I am trying out a creative way to mount the boards and devices, so it might not work for everyone, but I'm glad to share the boards that I have already made.
Attached Images
File Type: jpg vfet_os.jpg (875.2 KB, 481 views)
  Reply With Quote
Old 10th February 2018, 09:53 AM   #3492
MASantos is offline MASantos  Portugal
diyAudio Member
 
Join Date: May 2005
Location: Lisbon Portugal
Quote:
Originally Posted by luvdunhill View Post
I have some three output versions of an output stage that can be used in all the VFET designed posted.

I am trying out a creative way to mount the boards and devices, so it might not work for everyone, but I'm glad to share the boards that I have already made.
If I understand correctly your board can be built with 2 pairs of Vfets only right?

What creative solutions are you looking into for mounting into the heatsinks?
  Reply With Quote
Old 10th February 2018, 10:24 AM   #3493
massimo is offline massimo  Italy
diyAudio Member
 
Join Date: Dec 2002
Location: Milan, Italy
3 pairs indeed and 2 mosfets used as regulators
Beware of the 4 capacitors too close to the heatsink. Elcaps hate high temperature.
  Reply With Quote
Old 10th February 2018, 04:40 PM   #3494
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Sony VFET Amplifier Part 2
Quote:
Originally Posted by luvdunhill View Post
(referring to the original vfet2 document)

any issues increasing C1 and C2 to 660uF (the caps across the reference that biases the mosfets)? I have extra holes on my board that are begging to be filled. need symmetry and all that.
Yes. You do not want to delay the time it takes to achieve bias voltage.
  Reply With Quote
Old 11th February 2018, 12:48 AM   #3495
luvdunhill is online now luvdunhill  United States
diyAudio Member
 
luvdunhill's Avatar
 
Join Date: Jul 2006
Quote:
Originally Posted by MASantos View Post
What creative solutions are you looking into for mounting into the heatsinks?

I am using board level pin sockets for all the TO-3 devices and avoiding a L-bracket which is hard to get precision cut in small quantities.

Here is a prototype at 1.5A per rail.

IMG_0181.JPG

IMG_0180.JPG
  Reply With Quote
Old 11th February 2018, 12:55 AM   #3496
luvdunhill is online now luvdunhill  United States
diyAudio Member
 
luvdunhill's Avatar
 
Join Date: Jul 2006
Quote:
Originally Posted by Nelson Pass View Post
Yes. You do not want to delay the time it takes to achieve bias voltage.


Thank you!

In the CSX2 there is 1000uF in a similar position C3 (not for the VFET bias voltage but for the MOSFET bias). Perhaps only the vFET bias cap is important to not make too big? With more vFETs, should this 220uF cap for the vFET bias be lowered still?
  Reply With Quote
Old 11th February 2018, 04:55 PM   #3497
Nelson Pass is offline Nelson Pass  United States
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Sony VFET Amplifier Part 2
It's simply a matter of seeing to it that the bias voltage comes up faster
than the regulated rails, otherwise you can see a lot of current through
the output stage.
  Reply With Quote
Old 12th February 2018, 04:52 AM   #3498
Msr Mojo is offline Msr Mojo
diyAudio Member
 
Join Date: Jul 2015
Quote:
Originally Posted by luvdunhill View Post
I have some three output versions of an output stage that can be used in all the VFET designed posted.

I am trying out a creative way to mount the boards and devices, so it might not work for everyone, but I'm glad to share the boards that I have already made.

I'd be interested in a pair.
Please PM me (yours is full).
Thanks.

M
  Reply With Quote
Old 12th February 2018, 10:38 AM   #3499
dsdjoy is offline dsdjoy  Germany
diyAudio Member
 
Join Date: Jun 2009
I am also in interested in a pair of 3 output PCB. Thanks.
  Reply With Quote
Old 12th February 2018, 11:06 AM   #3500
R-K Rønningstad is offline R-K Rønningstad  Norway
diyAudio Member
 
R-K Rønningstad's Avatar
 
Join Date: Jan 2006
Location: Oslo
Me too
  Reply With Quote

Reply


Sony VFET Amplifier Part 2Hide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
PCBPCBs for Nelson Pass‘ CSX1 SONY VFET amplifier permaneder Group Buys 427 Yesterday 07:27 PM
Sony VFET Amps Nelson Pass Pass Labs 228 14th April 2014 11:04 PM
Sony Vfet housing Solid State 26 26th January 2014 03:38 AM
Sony TA-N7B VFET Help!! gpdavis2 Solid State 16 24th October 2009 01:20 PM
Sony VFET...tragic... EchoWars Solid State 21 11th November 2006 11:40 AM


New To Site? Need Help?

All times are GMT. The time now is 02:06 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki