F6 Amplifier - Page 218 - 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 1st October 2012, 03:03 PM   #2171
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Quote:
Originally Posted by Antoinel View Post
I hope that we cleared the frustrating confusion. The body of US 5,710,522 may show the significance of resistor R [Fig 1a] regarding the management of distortion. This is an example of me practicing diyaudio therapy by proxy.
buzzforb. The following pertains to US Patent #5,710,522; Fig 1a in my ZenPot.pdf file of an earlier post. It was filed July 15, 1996. Add 20 years life to it. Will expire in later than July 15 2016. It is alive and protected!

Amplifier having an active current source

Abstract The present invention is a single-ended Class A gain stage amplifier consisting of an active current source. A feedback path from an output node of the amplifier senses the direction and magnitude of the current going through a load coupled to the output node. The feedback path varies the output of the active current source in accordance with the sensed load current. By so doing, the efficiency of the amplifier of the present invention can be doubled as compared to prior art amplifiers operating in Class A mode. In addition, the present invention amplifier exhibits lower signal distortion.

Last edited by Antoinel; 1st October 2012 at 03:10 PM.
  Reply With Quote
Old 1st October 2012, 03:13 PM   #2172
lhquam is offline lhquam  United States
diyAudio Member
 
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
Buzz: That is exactly right.

In the F5, the P3 pot trims the two feedback networks to adjust the open-loop gains of the upper and lower halves of the amplifier. Making the open-loop gains equal at operating point nulls the 2nd harmonic.

In the F6, the Zen pot adjusts the effective degeneration resistance of one output FET, thus modifying the open-loop gain of one FET relative to the other.


Quote:
Originally Posted by buzzforb View Post
Same goal, different tool. Trust me
  Reply With Quote
Old 1st October 2012, 03:33 PM   #2173
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by Antoinel View Post
..... exhibits lower signal distortion. [/B]
one thing , which I didn't saw mentioned , is that sensing the load , it sense impedance variations , thus not behaving as usual sissy SE output .....

btw. there were numerous posts and threads regarding setting AC gain of Aleph CCS , along with several attempts of various members - trying it as plain (non modulated ) , thus non-Aleph CCS
conclusion is that majority of Greedy Boyz prefer 50% AC gain point , some prefer different amount , some like non-Aleph CCS , some simply hate it.
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 1st October 2012 at 03:37 PM.
  Reply With Quote
Old 1st October 2012, 03:44 PM   #2174
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Quote:
Originally Posted by buzzforb View Post
......
regarding your F6 wannabe -did you already tried some amount of simplest , crude SE bias addition ?
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM
  Reply With Quote
Old 1st October 2012, 04:22 PM   #2175
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Save that for when i get back from vacation
__________________
...Shape the sound , Man!
  Reply With Quote
Old 1st October 2012, 04:23 PM   #2176
diyAudio Member
 
buzzforb's Avatar
 
Join Date: Oct 2010
Location: Burlington, NC
Quote:
Originally Posted by Zen Mod View Post
one thing , which I didn't saw mentioned , is that sensing the load , it sense impedance variations , thus not behaving as usual sissy SE output .....

btw. there were numerous posts and threads regarding setting AC gain of Aleph CCS , along with several attempts of various members - trying it as plain (non modulated ) , thus non-Aleph CCS
conclusion is that majority of Greedy Boyz prefer 50% AC gain point , some prefer different amount , some like non-Aleph CCS , some simply hate it.
Virtual consensus
__________________
...Shape the sound , Man!
  Reply With Quote
Old 1st October 2012, 05:25 PM   #2177
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Default F6 Decoded

Quote:
Originally Posted by Nelson Pass View Post
ZM has been nagging me for information on the F6. I have a very nice
sounding prototype, but the design and the article that accompanies it
have some details remaining.

However, I can afford to put out this teaser:

The signal phases in the schematic of Conceptual F6 in Post #1 are correct as shown. This schematic is the invention US 5,710,522; albeit a much simpler and brilliant improvement.


Please consult the attached file ConceptualF6.pdf.
  • The bottom portion shows the schematic of the Aleph Current Source. Follow the sine wave squiggles where I indicated by the lightning arrows. The important signal squiggles are at the gates of Q1 and Q2. They are in phase.
  • The top part shows the relevant part of the schematic in Post #1. The phase of the signals at the gates of the output JFETs are exactly like those in the Aleph Current Source; or in-phase.
Attached Files
File Type: pdf ConceptualF6.pdf (34.9 KB, 49 views)
  Reply With Quote
Old 1st October 2012, 05:37 PM   #2178
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
Default it's more like - F6 , Antoinel-ed

re-read the patent

it's ..... well , patented

http://www.pat2pdf.org/patents/pat5710522.pdf
Attached Images
File Type: jpg pat5710522_Page_01.jpg (85.4 KB, 190 views)
File Type: jpg pat5710522_Page_02.jpg (39.9 KB, 189 views)
File Type: jpg pat5710522_Page_03.jpg (52.4 KB, 187 views)
File Type: jpg pat5710522_Page_04.jpg (35.4 KB, 185 views)
File Type: jpg pat5710522_Page_05.jpg (33.3 KB, 183 views)
File Type: jpg pat5710522_Page_06.jpg (35.7 KB, 43 views)
File Type: jpg pat5710522_Page_07.jpg (36.3 KB, 43 views)
File Type: jpg pat5710522_Page_08.jpg (36.5 KB, 50 views)
File Type: jpg pat5710522_Page_09.jpg (216.7 KB, 47 views)
File Type: jpg pat5710522_Page_10.jpg (241.3 KB, 36 views)
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 1st October 2012 at 05:47 PM.
  Reply With Quote
Old 1st October 2012, 05:46 PM   #2179
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
 
Zen Mod's Avatar
 
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
...... make a difference between current and voltage phase ;

besides that - there is no output current sensing anywhere in F6 , at least not in Aleph style
Attached Images
File Type: jpg pat5710522_Page_11.jpg (222.7 KB, 36 views)
File Type: jpg pat5710522_Page_12.jpg (169.3 KB, 26 views)
File Type: jpg pat5710522_Page_13.jpg (52.7 KB, 27 views)
__________________
my Papa is smarter than your Nelson !
clean thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa... by Mighty ZM

Last edited by Zen Mod; 1st October 2012 at 05:49 PM.
  Reply With Quote
Old 1st October 2012, 06:13 PM   #2180
diyAudio Member
 
Join Date: Jan 2012
Location: Pennsylvania
Blog Entries: 1
Quote:
Originally Posted by Zen Mod View Post
re-read the patent

it's ..... well , patented

http://www.pat2pdf.org/patents/pat5710522.pdf
US #5,710,522 belongs exclusively to Nelson S. Pass. F6 is US 5,710,522. Mr. Pass has the legal right to prevent others from practicing it. It means that commercial copycats can only practice the out-of- phase but not the in-phase signal drives to the output JFETs.





I read the subject patent many moons ago. The 3 vectors which led to this current revelation clicking now are:
  1. A patent is a legal and business [focus] tool. The astute business inventor effectively uses the granted patent during the 20 years begining with the filing date to further [capitalize on] his/her attendant business endeavors.
  2. The fascinating Zen Pot post discussions. It said look again at the patent
  3. I am a diyAudio member. If not somebody else will have made the connection; or disclosed by Mr. Pass.
lhquam and buzzforb: Please reverse the secondary signal phases on Teaser-6 and Franken6; you are there.
Bullet #1 hints where Mr. Pass will go to with F7 etc..

Last edited by Antoinel; 1st October 2012 at 06:20 PM.
  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 F6 diy coming soon ? Nounours18200 Pass Labs 37 31st August 2012 04:35 PM
Hi Vi F6 box ioro Multi-Way 4 15th April 2012 08:27 PM
Whats happening with F6? jugoslavija Pass Labs 1 1st November 2011 07:39 AM
Hi-Vi F6 kkosiba Multi-Way 14 9th November 2007 08:38 AM
F6 traw Pass Labs 7 2nd November 2007 07:09 PM


New To Site? Need Help?

All times are GMT. The time now is 08:39 PM.


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