A very interesting amplifier schem , do someone knows more about?? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 14th August 2010, 11:01 AM   #1
diyAudio Member
 
Join Date: Sep 2005
Default A very interesting amplifier schem , do someone knows more about??

Hello

Here is a amplifier schematic , for 2 different type power mosfet or to the new Sanken darlington .
Do someone know more about these ?
Any comment welcome since only the schematic and a couple words ,to me looks like Japanese .
Sorry if already somebody ask about these , I didn't find any info on the forum.
Please take a look .

Greetings
Attached Images
File Type: jpg 201012817639739.jpg (146.7 KB, 699 views)
  Reply With Quote
Old 14th August 2010, 11:21 AM   #2
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
These are device with integrated diodes for thermal tracking.
They are at least 10 years old.
Elektor did use them in a few designs..
  Reply With Quote
Old 14th August 2010, 11:50 AM   #3
diyAudio Member
 
Join Date: Aug 2008
Interesting front end!
  Reply With Quote
Old 14th August 2010, 05:41 PM   #4
diyAudio Member
 
Join Date: Sep 2005
Hello

Yes the front end I think a bit over complicate but can be still good .
The output section actually very nice .
Probably for a few watt biased in class A or all the way ? 40V PS and 3 pair high power mosfet or darlingtons .
I was curious if anybody tried to clone these . Or the front end to scary?? It seems to me a bit over "the limit" .

Greetings
  Reply With Quote
Old 14th August 2010, 06:14 PM   #5
diyAudio Member
 
Join Date: Aug 2008
Well, the front end is probably good thanks to its relative complexity. I´m willing to try simulating it and if I can get it stable in the simulator I might build it and pair it with Cordell´s error correction output stage.

  Reply With Quote
Old 15th August 2010, 09:09 AM   #6
CBS240 is offline CBS240  United States
diyAudio Member
 
CBS240's Avatar
 
Join Date: Aug 2005
Location: K-town
Not too complicated at all, cascodes with J-fet CCS's to set the cascode voltages and the current sources for the LTP legs, the VAS mirror is also cascode. The difference in current from the sum of the two LTP leg sources and common mode current source at the bottom for both sides drives the VAS. Quite a neat arrangement I think.
__________________
All the trouble I've ever been in started out as fun......
  Reply With Quote
Old 15th August 2010, 09:48 AM   #7
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Front end looks like Roender's "RMI" folded cascode. Only difference is the FET CCS for the cascode references. Another neat thing ... it looks like a modular setup , plug in any output stage. #1 is P-N vertical 2- quasi vertical 3 - a mystery?? (proprietary **)
OS
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper

Last edited by ostripper; 15th August 2010 at 09:54 AM.
  Reply With Quote
Old 15th August 2010, 10:10 AM   #8
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
Originally Posted by gaborbela View Post
Hello

Yes the front end I think a bit over complicate but can be still good .
The output section actually very nice .
Probably for a few watt biased in class A or all the way ? 40V PS and 3 pair high power mosfet or darlingtons .
I was curious if anybody tried to clone these . Or the front end to scary?? It seems to me a bit over "the limit" .

Greetings
Maybe if you compare it to a DX. It is just a slighty augmented "symasym"... I might sim it and put it on a 75mm X 75mm PCB module , just for fun (HX "mongrel").
OS
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper
  Reply With Quote
Old 15th August 2010, 10:49 AM   #9
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 109
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
Quote:
Originally Posted by gaborbela View Post
Any comment welcome since only the schematic and a couple words ,to me looks like Japanese .
Chinese I think. A couple of points - don't follow the input wiring arrangement shown - decoupling to the input ground (unless you want fairly poor sound). And the output stages have the zobel network on the wrong side of the output choke. According to Doug Self, the zobel is to help suppress VHF parasitics in the output stage, putting it on the far side of an inductor will reduce its effectiveness at that.
__________________
There is surely nothing quite so useless as doing with great efficiency what should not be done at all - Peter Drucker
  Reply With Quote
Old 15th August 2010, 11:01 AM   #10
diyAudio Member
 
ostripper's Avatar
 
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Quote:
Originally Posted by abraxalito View Post
Chinese I think. A couple of points - don't follow the input wiring arrangement shown - decoupling to the input ground (unless you want fairly poor sound). And the output stages have the zobel network on the wrong side of the output choke. According to Doug Self, the zobel is to help suppress VHF parasitics in the output stage, putting it on the far side of an inductor will reduce its effectiveness at that.

That is probably a HF input filter (220-470pF) OUR (DIY) zobels are standard ..
I don't think this was meant to be built , just an overview of some chinese design with a separate more specific BOM.
OS
__________________
Mongrel website , always current and updated :
http://www.fidelityforce.com/ostripper
  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
interesting amplifier schematic lt cdr data Solid State 2 14th May 2009 05:35 PM
Help to understand this schem please! apr Instruments and Amps 11 1st January 2009 09:06 PM
help, schem for sherwood psychosteve Solid State 0 10th November 2004 06:35 PM
Interesting Gainclone type amplifier? misterresistor Chip Amps 23 29th April 2004 11:11 PM
Interesting amplifier thylantyr Solid State 0 3rd March 2003 09:33 AM


New To Site? Need Help?

All times are GMT. The time now is 07:07 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