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

Vendor's Bazaar Commercial Vendors large & small hawking their wares

VSSA Lateral MosFet Amplifier
VSSA Lateral MosFet Amplifier
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 12th August 2017, 08:46 PM   #3461
maxidcx is offline maxidcx  France
diyAudio Member
 
Join Date: Jan 2012
VSSA Lateral MosFet Amplifier
Hi, just put a CRD device (current source/sink) between rail and base, then a Zener between base and output.
This is the same kind of approach that is used for the AMBlaboratoroies Beta 22 (and 24) where you might have a look
also NPass did some experimentation about this and I remember a PDF somewhere...
cheers
__________________
we dont know how much we dont know
  Reply With Quote
Old 12th August 2017, 10:48 PM   #3462
maxlorenz is offline maxlorenz  Chile
diyAudio Member
 
maxlorenz's Avatar
 
Join Date: Oct 2003
Location: osorno , Chile
Quote:
Originally Posted by maxidcx View Post
Hi, just put a CRD device (current source/sink) between rail and base, then a Zener between base and output.
This is the same kind of approach that is used for the AMBlaboratoroies Beta 22 (and 24) where you might have a look
also NPass did some experimentation about this and I remember a PDF somewhere...
cheers
Hi and thanks for the advice. That Beta22 is very interesting, though more complex. The nice thing about the VSSA is contained in his name.

I am fully sold to cascoding.
Next is cascoding all stages and then paralelling output devices with higger PS rails.

All the best,
M.
__________________
"Cascode all thy outputs".
  Reply With Quote
Old 13th August 2017, 06:12 AM   #3463
maxidcx is offline maxidcx  France
diyAudio Member
 
Join Date: Jan 2012
VSSA Lateral MosFet Amplifier
yeah managing to linearize all stages is good and the basis, but still do not under estimate the importance of Loopgain (nfb) to get all the residual out, (with high slewrate).
from my side, I m working on Composite amplifier based on CFA+opamp. kind of "alexander amp" this outperform while providing stable bias, controled tempco and very low offset (5mv) without trim.

Just start from Alexander amp, put wilson current miror on each rail, a simple resistor for bias control and a pair of lateral mosfet. then choose a symetrical opamp like LT136x or AD844 and a global feedback loop between output and in- of the op amp.
__________________
we dont know how much we dont know

Last edited by maxidcx; 13th August 2017 at 06:31 AM.
  Reply With Quote
Old 13th August 2017, 03:37 PM   #3464
maxlorenz is offline maxlorenz  Chile
diyAudio Member
 
maxlorenz's Avatar
 
Join Date: Oct 2003
Location: osorno , Chile
Interesting ideas.Not that I understand everything you comment...

Anyway, more complex topologies tend to "sound" more "analytical" generally, so we want to keep in mind that involving sound reproduction is our goal...I mean, sometimes a more elegant technical solution sounds worse than the simplest, bulkier, uglier, inefficient way...that is why we have to take the time to evaluate each step sound-wise.

Cascoding the outputs makes sense to me because the physically bigger output units have also bigger BC (GD) capacitance...

Je vous souhaite la meilleure des chances.
M.
__________________
"Cascode all thy outputs".
  Reply With Quote

Reply


VSSA Lateral MosFet AmplifierHide 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
2SK/irfp lateral vertical mosfet amplifier HELP ?? medogrizli Solid State 58 5th March 2017 10:18 AM
Really simple lateral mosfet amplifier Tekko Solid State 11 25th March 2013 06:31 PM
Magic - My first Lateral MOSFET Push-Pull amplifier shaan Solid State 44 7th September 2011 11:47 AM
200 Watt Lateral Mosfet Amplifier macgyver Solid State 32 14th January 2005 06:37 AM
200W Lateral Mosfet Amplifier macgyver Solid State 5 7th July 2003 07:49 PM


New To Site? Need Help?

All times are GMT. The time now is 04:29 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki