Circlotron amp using N-channel mosfets - Page 10 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 19th April 2004, 01:04 PM   #91
mgreene is offline mgreene  United States
diyAudio Member
Join Date: Jun 2002
Location: Aiken, South Carolina USA
Default "is it same as Mr Circlotron's."

"is it same as Mr Circlotron's."

I was interested in the details of the tube driver stage.

Is anyone considering using a battery PS on the output stage of such an amp?

Also, how does the design being discussed here relate to Tenor's solid state amp - if at all?

  Reply With Quote
Old 28th June 2004, 01:43 PM   #92
diyAudio Member
Circlotron's Avatar
Join Date: Jun 2002
Location: Melbourne, Australia
Originally posted by john-china
is it same as Mr Circlotron's.
Different in detail but exactly the same principle.
Best-ever T/S parameter spreadsheet.
  Reply With Quote
Old 11th May 2011, 10:09 PM   #93
diyAudio Member
tiefbassuebertr's Avatar
Join Date: Jul 2005
Location: D-55629 Schwarzerden
I am looking for a bias servo appropriate for CSPP/Circlotron power buffer.
For Totem pole output stages there exist a topology designed by William T Chater. By post #40 about
Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power?
you will find more informations.
Bias control for power amplifiers
is to find the circuit idea therefore.
Is it possible to perform a conversion of this topology suited for a Circlotron ?

Last edited by tiefbassuebertr; 11th May 2011 at 10:13 PM.
  Reply With Quote
Old 23rd August 2014, 06:16 PM   #94
diyAudio Member
Join Date: Jun 2004
Location: France
Originally Posted by Circlotron View Post
Hi everybody. This is how the project is progressing. As you can see I have made the output into a Sziklai pair on the suggestion of AKSA, (thanks heaps, mate ). This makes the output LOTS more linear. As an example, before I had to use ~200mA quiescent current to eliminate crossover distortion, now I can do it with 75mA. Actually I am running 100mA right now and may return to 200 and see if it sounds and better.

The fets are now tricked into thinking they are P-channel devices and so the whole circuit is upside down. It looks a bit confusing at first, but take my word for it, the things works. To me it sounds just so smooth and clean. Even through that 3C90-cored input tranny!

Next thing to do is figure out some feedback from output to input because the output impedance is 0.47 ohms courtesy of the "source" resistors (that are connected to the drains).

I have not cranked the volume way up yet because of lack of drive voltage avaliable. I gotta make a preamp for it yet. Doesn't that symmetry of the schematic make your mouth water?


It is a CFP circlotron ?

Who made a solid state circlotron ?

Last edited by UltimateX86; 23rd August 2014 at 06:27 PM.
  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
Only N-Channel MOSFETs (NMOS); better Audio from non complements by Audio Power? tiefbassuebertr Solid State 49 19th April 2016 03:18 PM
Replacement transistors/mosFETs for holton n-channel amp hulsebos Solid State 24 12th March 2010 04:56 AM
Push-Pull using only N-Channel MOSFETs Kashmire Solid State 32 6th August 2009 01:48 PM
Circlotron djk Pass Labs 13 20th August 2006 03:19 AM
P-channel mosfets for Aleph Peter Daniel Pass Labs 10 15th August 2002 11:12 PM

New To Site? Need Help?

All times are GMT. The time now is 03:13 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