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

Solid State Talk all about solid state amplification.

DLH Amplifier: The trilogy with PLH and JLH amps
DLH Amplifier: The trilogy with PLH and JLH amps
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 29th August 2017, 01:34 AM   #21
diegomj1973 is offline diegomj1973  Argentina
diyAudio Member
 
diegomj1973's Avatar
 
Join Date: Mar 2010
Location: Marcos Juárez - Córdoba
Quote:
Originally Posted by AndrewT View Post
The composite using either a gain stage, or a Current Buffer for the second stage usually offers increased performance.
W.Jung has written extensively on this. Our Member Tomchr has produced such a composite and to date his achieved performance is way above what any plain Jane 3886 could achieve.
It would be interesting to analyze how it would be implemented in my circuit and try to verify if it improves the current parameters, see to what degree it could improve them and if it justifies more circuital complication.

Welcome who wants to contribute ideas and in this way to be able to improve it.

regards
  Reply With Quote
Old 29th August 2017, 06:30 AM   #22
PRR is offline PRR  United States
diyAudio Member
 
PRR's Avatar
 
Join Date: Jun 2003
Location: Maine USA
> The circuit was first described by Christopher Rush in 1964.

I have it, uncreditied, in a book from 1966?

I re-invented it a decade ago except as two inputs (put a resistor between the emitters to define gain). It makes a differential input where 2nd does not cancel. THD is tiny for low gain but if you open it up as a mike-amp you get usual low-NFB BJT curvature.

> nothing is new under the sun

The ancients are always stealing our inventions. Especially in audio.
  Reply With Quote
Old 29th August 2017, 12:07 PM   #23
Ketje is online now Ketje  Belgium
diyAudio Member
 
Ketje's Avatar
 
Join Date: Dec 2012
Location: Flanders
Quote:
Originally Posted by diegomj1973 View Post
Regards
Yes, i missed that .You made your point (or not )
The schematic i posted before has the same problem The ground symbol on the most negative side has to go.
Mona

Last edited by Ketje; 29th August 2017 at 12:15 PM.
  Reply With Quote
Old 30th August 2017, 10:45 AM   #24
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Something similar, also nice:
http://www.andiha.no/articles/audio/.../nostalgia.pdf
from this site:
Audio
__________________
Please don't use private messages for question related to audio projects. It defeats the purpose of the forum.
  Reply With Quote
Old 30th August 2017, 10:53 AM   #25
scottjoplin is offline scottjoplin  Wales
diyAudio Member
 
scottjoplin's Avatar
 
Join Date: Dec 2015
Location: Penrhyndeudraeth
Quote:
Originally Posted by PRR View Post

The ancients are always stealing our inventions.
A creature with a "rotary engine" Flagellum - Wikipedia
__________________
Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST
  Reply With Quote
Old 31st August 2017, 04:08 AM   #26
diegomj1973 is offline diegomj1973  Argentina
diyAudio Member
 
diegomj1973's Avatar
 
Join Date: Mar 2010
Location: Marcos Juárez - Córdoba
Here the circuit of the NAD 3020. It is a real shame that they have not taken advantage of the collector terminal of the BC559 (corresponding to the series LTP) . In that way, perhaps they could have used only four transistors.

The only thing in the NAD 3020 that resembles to my circuit is that it uses series LTP, too. In my humble opinion, the full potential of that input circuit has been wasted.

Regards
Attached Images
File Type: gif nad3020riaa.gif (5.6 KB, 1163 views)
  Reply With Quote
Old 31st August 2017, 04:32 AM   #27
diegomj1973 is offline diegomj1973  Argentina
diyAudio Member
 
diegomj1973's Avatar
 
Join Date: Mar 2010
Location: Marcos Juárez - Córdoba
Quote:
Originally Posted by juma View Post
Something similar, also nice:
http://www.andiha.no/articles/audio/.../nostalgia.pdf
from this site:
Audio
Thank you juma. Nostalgia is three stages. My design is only two stages .

Similarities: both eliminate the undesirable output capacitor. But in my design, the capacitor of the feedback network is also eliminated, improving to some extent the IMD .

Regards
  Reply With Quote
Old 31st August 2017, 09:09 AM   #28
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Fundamental similarity is the exploration of the JLH1969's and PLH's idea/legacy (dancing between SE and PP regime in a specific manner, and that's basically the same).
Input cap/feedback cap, two/three stages is trivial...
Great job anyway, keep up the good work
__________________
Please don't use private messages for question related to audio projects. It defeats the purpose of the forum.
  Reply With Quote
Old 31st August 2017, 12:43 PM   #29
Nico Ras is offline Nico Ras  South Africa
diyAudio Member
 
Nico Ras's Avatar
 
Join Date: Nov 2005
Location: East Coast of South Africa
Goodness guys, give the man a little space, he is sharing an idea that could be a nice sounding amplifier, whether it existed in the stone age is totally irrelevant.

The DIYaudio community would do their level best to ridicule another member for sharing what he believes is an original idea.

Diegomj1973 post your idea in a forum that would appreciate it.

I simmed it, and it looks very promising, I am keen to hear it too. To me your idea is original in its implementation.
__________________
Kindest regards
Nico

Last edited by Nico Ras; 31st August 2017 at 12:49 PM.
  Reply With Quote
Old 31st August 2017, 02:20 PM   #30
juma is offline juma  Germany
diyAudio Member
 
juma's Avatar
 
Join Date: Nov 2005
Location: Berlin
Nico, where did you see "ridicule" ?
Of course it's a nice project and the contribution is appreciated, but prior art is certainly not irrelevant, especially when it comes to very old and popular design that set the milestone in its own time...
The title of this thread itself mentions JLH and PLH and I just quoted another successful implementation of the same idea, that is worth mentioning in the context.
__________________
Please don't use private messages for question related to audio projects. It defeats the purpose of the forum.

Last edited by juma; 31st August 2017 at 02:23 PM.
  Reply With Quote

Reply


DLH Amplifier: The trilogy with PLH and JLH ampsHide 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
Powering op amps from amplifier PSU Mrcloc Solid State 19 24th June 2016 01:39 PM
Circuit diagram for Trilogy VTi. harwoodspark Tubes / Valves 0 1st August 2007 07:36 PM
OP-AMPS in Marantz PM7000 Amplifier Alex2 Digital Source 2 18th February 2004 11:14 AM
OP-AMPS in Marantz PM7000 Amplifier Alex2 Chip Amps 0 17th February 2004 09:17 AM
OP-AMPS in Marantz PM7000 Amplifier Alex2 Analogue Source 0 17th February 2004 09:08 AM


New To Site? Need Help?

All times are GMT. The time now is 06:27 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki