Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

The Kuartlotron - keantoken's simple error-correction superbuffer
The Kuartlotron - keantoken's simple error-correction superbuffer
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 18th February 2014, 07:34 PM   #51
keantoken is offline keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Quote:
Originally Posted by Zero D View Post
I tried various Caps in the following position, & the 1nf boosted the HF -3dB up to over 1GHz ! THD was still below 0.001% @ 20kHz with 1V RMS

Whether this would be stable etc in Reality ? Even if it's OTT for audio, it "might" be a useful technique for video ?
That works great with low source impedance, and a source that's willing to drive the entire buffer at 1GHz. But it causes negative input resistance which turns your input cable into an RF transmitter, or at the least cancels the loss of the preceeding wiring and boosts RFI reception.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 18th February 2014, 07:34 PM   #52
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
The Kuartlotron - keantoken's simple error-correction superbuffer
Quote:
Originally Posted by RCruz View Post
philosophical ?
Yes, in my view, bcs it exploits philosophy on intrinsic semiconductor characteristics than brute force to attend its goals.
  Reply With Quote
Old 18th February 2014, 07:50 PM   #53
keantoken is offline keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Quote:
Originally Posted by RCruz View Post
I am planning to use the Kuartlotron just after a jfet common source high gain amp stage.

It outputs 10v DC offset modulated by signal.

Maybe I can build the stock buffer with simetrical psu (so I will loose output cap) but would like to increase it's input impedance to 1mega so I can use a small cap in the input.
What is signal ground referenced to? If it's on the same supply, I need to know where the reference is. If isolated supply, then I can make a single-rail version without coupling caps. It may be that you will end up needing caps in the signal path if you want to power it from the same supply as your Jfet circuit.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 18th February 2014, 07:53 PM   #54
keantoken is offline keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Quote:
Originally Posted by Salas View Post
Yes, in my view, bcs it exploits philosophy on intrinsic semiconductor characteristics than brute force to attend its goals.
Yep, I think the Kuartlotron is very philosophical in that sense.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 18th February 2014, 08:30 PM   #55
forr is offline forr  France
diyAudio Member
 
forr's Avatar
 
Join Date: Dec 2004
Location: Next door
The princinple of the circuit is similar to the one shown by figure #12 :
( source : entree )

The Kuartlotron - keantoken's simple error-correction superbuffer
  Reply With Quote
Old 18th February 2014, 09:02 PM   #56
Joachim Gerhard is offline Joachim Gerhard  Germany
diyAudio Member
 
Joachim Gerhard's Avatar
 
Join Date: Mar 2009
" There is nothing new under the sun "
Salomon
  Reply With Quote
Old 18th February 2014, 09:15 PM   #57
keantoken is offline keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Nice! The lowest-distortion output point for this circuit is the emitter though, not the collector. Still, it behaves like an ideal transistor and could go in virtually any place you'd use a transistor, for instance LTP, drivers, buffers, and so on.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 18th February 2014, 09:56 PM   #58
Kindhornman is offline Kindhornman  United States
diyAudio Member
 
Kindhornman's Avatar
 
Join Date: Aug 2012
Location: Los Angeles, California
The Kuartlotron - keantoken's simple error-correction superbuffer
So is this the answer to the question of what to put in front of the OP section Ostripper has designed, or H/k if we want to give them the credit? Would this complete the CFA amplifier design?
  Reply With Quote
Old 18th February 2014, 10:13 PM   #59
keantoken is offline keantoken  United States
diyAudio Member
 
keantoken's Avatar
 
Join Date: Aug 2006
Location: Texas
Kindhornman, I'm not sure.

I notice many people slap on different topologies of input, VAS, etc onto an amp without actually checking if that stage is even a significant source of distortion in the design.

I would say the Kuartlotron as a CFA frontend would be great IF it were shown that the input stage was a source of distortion in the first place and that the Kuartlotron would not cause the same distortions. I'm inclined to believe that the input stage of a CFA amplifier is not a significant source of distortion unless it is a very low-gain input stage - in which case, any high-gain input stage will work well, not just the Kuartlotron.

All these things depend to an extent on the specific amplifier. Some CFB amps may be improved, others may not.
__________________
The Kmultiplier rail filter! -=- The Simple Kuartlotron Superbuffer!
Need something built, repaired or modded? PM me and ask what I can do!
  Reply With Quote
Old 18th February 2014, 10:23 PM   #60
Kindhornman is offline Kindhornman  United States
diyAudio Member
 
Kindhornman's Avatar
 
Join Date: Aug 2012
Location: Los Angeles, California
The Kuartlotron - keantoken's simple error-correction superbuffer
Thanks Keantoken,
It seems like we have come down to perhaps this type of input section or the diamond for the front end of the CFA. I haven't seen to many proposing the LTP type of input for the CFA but perhaps I have been misinterpreting that? I am just an observer here so I am trying to learn and see what a few of you gurus seem to being directing this end towards. The triple output section seems to be the most relevant but I understand that the double EF can also be made to work.
  Reply With Quote

Reply


The Kuartlotron - keantoken's simple error-correction superbufferHide 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
New error correction amp PMA Solid State 101 3rd January 2011 11:00 PM
error correction et al' sq225917 Digital Source 4 7th August 2007 10:16 AM
Visual error correction? Circlotron Everything Else 4 15th September 2003 04:17 PM


New To Site? Need Help?

All times are GMT. The time now is 07:23 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki