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 7th January 2013, 03:28 PM   #301
Idefixes is offline Idefixes  France
diyAudio Member
 
Idefixes's Avatar
 
Join Date: Dec 2003
Location: Mulhouse - Alsace
Send a message via ICQ to Idefixes
Hi LC,

Do you have an objection for little ccs board that could be plugged on 15K place? As for TSSA 2N5462 can do that job i think. Have you a target value for ccs resistor?

Marc
__________________
website : http://audiyofield.wifeo.com/index.php
  Reply With Quote
Old 7th January 2013, 03:36 PM   #302
Lazy Cat is online now Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
OK, CCS's in/out pins will be aligned, so small CCS module PCB can be installed.

Target value is around 2 k, depends on Vgs/Id curve of 2N5462.
  Reply With Quote
Old 7th January 2013, 03:50 PM   #303
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Location: Waterloo, ON or Herefordshire
VSSA Lateral MosFet Amplifier
It's looking good
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 7th January 2013, 03:54 PM   #304
Esperado is offline Esperado  France
Banned
 
Join Date: Jul 2011
Location: Portugal
Quote:
Originally Posted by Lazy Cat View Post
VSSA 1.4 Schematic final version
I don't understand the caps after the current sources...
I don't like parallel film caps with electrolytic neither unless some inductance or resistance between them to dump the resonance..

Last edited by Esperado; 7th January 2013 at 03:57 PM.
  Reply With Quote
Old 7th January 2013, 04:04 PM   #305
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
I think the caps are necessary for AC feedback.
  Reply With Quote
Old 7th January 2013, 04:07 PM   #306
Lazy Cat is online now Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Esperado View Post
I don't understand the caps after the current sources...
I don't like parallel film caps with electrolytic neither unless some inductance or resistance between them to dump the resonance..
These capacitors form feedback AC ground, without them amplifier is not working properly. Two in parallel to cover bandwidth currents in low Z.
  Reply With Quote
Old 7th January 2013, 04:15 PM   #307
Esperado is offline Esperado  France
Banned
 
Join Date: Jul 2011
Location: Portugal
Quote:
Originally Posted by Lazy Cat View Post
These capacitors form feedback AC ground, without them amplifier is not working properly. Two in parallel to cover bandwidth currents in low Z.
So, you have a current source for DC only ?

Do not believe that paralleling film and electrolytic caps reduce the Z at HF, it is exactly the opposite.
They make a resonant circuit with the inductance of the electrolytic situated inside the bandwidth of the amp. One of the reason some found SSA was sounding better without the film.
And, may-be, why you have this hard to dump ringing with capacitive load ?
  Reply With Quote
Old 7th January 2013, 04:20 PM   #308
Lazy Cat is online now Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Bigun View Post
It's looking good
Yes indeed, it also measures very good and it is unconditionally stable. I intentionally overloaded it with 2,2 uF at 100 kHz squares without load's real component and it survived with distortions only. No output noise noticable.
  Reply With Quote
Old 7th January 2013, 04:26 PM   #309
Lazy Cat is online now Lazy Cat  Slovenia
diyAudio Member
 
Lazy Cat's Avatar
 
Join Date: Sep 2007
Quote:
Originally Posted by Esperado View Post
So, you have a current source for DC only ?
No it handles every possible micro current mudulations, the ones resistor cannot at least to such low levels. Tested.

Quote:
Originally Posted by Esperado View Post
why you have this hard to dump ringing with capacitive load ?
Capacitor on output leads is sort of a short circuit linearly going down to zero with frequency rising. Since squares are row of harmonic structure, capacitor's impedance slowly eliminates high order harmonics and the result is distorted squares. Perfectly normal plot result.
  Reply With Quote
Old 7th January 2013, 04:49 PM   #310
Esperado is offline Esperado  France
Banned
 
Join Date: Jul 2011
Location: Portugal
Quote:
Originally Posted by Lazy Cat View Post
Perfectly normal plot result.
You had no protective inductance and resistive load when you did the square test ?
About // capacitances, some useful links:
Some useful links:
http://www.hagtech.com/pdf/snubber.pdf
http://www.ti.com/lit/an/sloa069/sloa069.pdf
http://www.n4iqt.com/BillRiley/multi...ypass-caps.pdf
  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 11:18 AM
Really simple lateral mosfet amplifier Tekko Solid State 11 25th March 2013 07:31 PM
Magic - My first Lateral MOSFET Push-Pull amplifier shaan Solid State 44 7th September 2011 12:47 PM
200 Watt Lateral Mosfet Amplifier macgyver Solid State 32 14th January 2005 07:37 AM
200W Lateral Mosfet Amplifier macgyver Solid State 5 7th July 2003 08:49 PM


New To Site? Need Help?

All times are GMT. The time now is 02:00 AM.


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