SemiSouth boiler room - Page 36 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 4th May 2014, 11:41 AM   #351
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
You can get huge cascode devices, or you can parallel some devices with
ballast resistors for current sharing.

  Reply With Quote
Old 4th May 2014, 11:56 AM   #352
diyAudio Member
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Nelson in this type of application would you expect a power Jfet used as a folower to
have significantly lower distortion and used as a follower the input capacitance won't be
a problem to drive ( as you mentioned in your mosfet citation 12 article )
  Reply With Quote
Old 5th May 2014, 01:22 AM   #353
aoc is offline aoc  Malaysia
diyAudio Member
Join Date: Nov 2006
It should also help improve the open loop bandwidth if memory serves me right


Sent from my C6903 using Tapatalk 2
  Reply With Quote
Old 5th May 2014, 01:51 AM   #354
The one and only
Nelson Pass's Avatar
Join Date: Mar 2001
I don't expect that there would be any issues. As followers, almost everything
we play with is easily driven from a capacitance standpoint. The rationale
for cascoding the follower is to take dissipation off the part so that you
can bias it at high levels.

  Reply With Quote
Old 5th May 2014, 01:03 PM   #355
poynt99 is offline poynt99  Canada
diyAudio Member
Join Date: Jan 2013

I believe you've also noted elsewhere that followers exhibit less distortion if ran under cascode. Is that because of the increased bias current, or lower voltage across the device?
  Reply With Quote
Old 5th May 2014, 01:16 PM   #356
diyAudio Member
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
Nelson has a whole paper about this.
  Reply With Quote
Old 10th August 2014, 03:18 AM   #357
diyAudio Member
Join Date: Dec 2012
Location: Starkville, Mississippi, USA
Default What's the Buzz - Part II

Attached is the second part in a three part series entitled "What's the Buzz?" The document and a supporting spreadsheet are included in the zip archive. I had to reduce the resolution of the pdf document to fit under the upload file size limit imposed by the forum. If you prefer slightly better resolution, email me and maybe I can arrange for the higher rez document to be available on a file uploader site.

Many of you have encouraged me throughout the more than one year it has taken me to research and write the second installment. Well! I"m glad to finally be able to push the post button and get this off my chest. It's like a good confession, it really puts the mind at ease.

Anyway, as before, this is the next step in my goal to understand why you guys like the SemiSouth JFET so much.

As before, I hope you find it both worthwhile and entertaining to read. The subject of Part III, negative feedback, is hardly a topic calculated to get the next one out in a timely manner, but your encouragement does really help.
Attached Files
File Type: zip Whats the (927.0 KB, 224 views)
  Reply With Quote
Old 10th August 2014, 04:05 AM   #358
Apogee is offline Apogee  United States
diyAudio Member
Apogee's Avatar
Join Date: Feb 2002
Location: Tacoma, WA
Thumbs up Awesome!


I/we really appreciate you taking the time to put this together. I'm looking forward to learning from it. Part I was excellent.

I keep hoping the products will get re-released at some point. I think the demand would be there.

Thanks again,

"If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once a week." - Charles Darwin

Last edited by Apogee; 10th August 2014 at 04:09 AM.
  Reply With Quote
Old 10th August 2014, 04:20 AM   #359
labjr is offline labjr  United States
diyAudio Member
Join Date: Apr 2003
Location: MA
Good reading! Thanks
  Reply With Quote
Old 10th August 2014, 08:57 AM   #360
Zen Mod is offline Zen Mod  Serbia
diyAudio Member
Zen Mod's Avatar
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
amusing and witty

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


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
Semisouth goes Dodo ; what now ? Zen Mod Pass Labs 265 25th May 2017 08:07 PM
Semisouth Aleph J? buzzforb Pass Labs 59 28th February 2014 06:53 AM
Fostex "boiler plate" speakers aeronautical Multi-Way 49 22nd June 2012 08:22 PM
Black Hole in your listening room; room treatment dfidler Everything Else 5 29th March 2011 12:02 AM
basic room design my ht room :) JinMTVT Multi-Way 4 4th September 2007 11:35 AM

New To Site? Need Help?

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

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2