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Old 6th January 2010, 03:41 PM   #151
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Quote:
Originally Posted by tomat View Post
nice and useful articles Tief
Hallo tomat,
today I discover the right name of your circuit: it is the "T-Circuit"
The exactly title name of the according article about the "T-Circuit" is follow:
"An Ultra-Low Distortion Direct-Current Amplifier" from the author
BART N. LOCANTHI (James B. Lansing Sound, Inc.

http://www.harman.com/EN-US/OurCompa...tions/1091.pdf

By another thread Mr. Bob Cordell mentioned this one and therefore I have found this article
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Old 10th January 2010, 03:39 PM   #152
tomat is offline tomat  Indonesia
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Quote:
Originally Posted by tiefbassuebertr View Post
Hallo tomat,
today I discover the right name of your circuit: it is the "T-Circuit"
The exactly title name of the according article about the "T-Circuit" is follow:
"An Ultra-Low Distortion Direct-Current Amplifier" from the author
BART N. LOCANTHI (James B. Lansing Sound, Inc.

http://www.harman.com/EN-US/OurCompa...tions/1091.pdf

By another thread Mr. Bob Cordell mentioned this one and therefore I have found this article

Hello Tief
sorry for this late reply, it's interesting circuit, Tief ,i was sent you pm,would you please to check?
thanks
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Old 3rd March 2010, 04:10 PM   #153
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Hi Tomat,
i found this, which is close to your buffer.

Andrea Ciuffoli - Home Page
http://www.audiodesignguide.com/my/Cool_Follower2.GIF
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Old 3rd March 2010, 04:23 PM   #154
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Quote:
Originally Posted by bobodioulasso View Post
Hi Tomat,
i found this, which is close to your buffer.

Andrea Ciuffoli - Home Page
http://www.audiodesignguide.com/my/Cool_Follower2.GIF
I discover only the PS. Mean you this follower?
http://www.audiodesignguide.com/my/Cool_Follower1.GIF
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Old 3rd March 2010, 04:33 PM   #155
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More exactly this one
http://www.audiodesignguide.com/my/Hot_Follower2.GIF
Though i realise now it is different. That is a diamond buffer working in class A, close to ES200, at final.
Is there any advantage to use a floating ground?

Last edited by bobodioulasso; 3rd March 2010 at 04:37 PM.
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Old 3rd March 2010, 04:39 PM   #156
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Quote:
Originally Posted by tomat View Post
Hello Tief
sorry for this late reply, it's interesting circuit, Tief ,i was sent you pm,would you please to check?
thanks
Today I have only just discovered the area for the private messages (PM - I do not know this abbreviation until now) in diyaudio - it's full of messages from many members.
Better it is in generall, sending PM's to my own e-mail address (go to public profile - therefore click on my member name at left site of my diyaudio-post).
By the way - the member name "Tiefbassuebertr" is based on my weblink "www_tiefbassuebertragung_de"
To your problem:
Without much experience with circuit traces, I strongly advise you to build the power follower only two stages (or one single ended power follower stage with MOSFET). By many finished amplifiers, that have three or four stages like yours, I reduce to two stages (i. e. normal darlington configuration) very often. Only in this way I eliminate wild oscillations sometimes in the MHz aera.
The URLs of the previous post is a good solution for you.

Last edited by tiefbassuebertr; 3rd March 2010 at 04:45 PM.
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Old 17th March 2010, 10:51 AM   #157
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by bobodioulasso View Post
I would like to transpose the Nelson Pass F5 design, cascoding the input Jfets, and degenerating smaller power output mosfets.

But for starting with the buffer i will use an existing voltage amplifier.
I want to listen to the buffer first.
If you like to use Firstwatt, it has enough current already and need only single stage emitter follower.
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Old 17th March 2010, 11:03 AM   #158
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by bobodioulasso View Post
Hi Tomat,
i found this, which is close to your buffer.

Andrea Ciuffoli - Home Page
http://www.audiodesignguide.com/my/Cool_Follower2.GIF
Is your buffer not finished yet?
My cheap is finished, all components replaced with cheaper again and again, and the sound is nothing special, but gets worse and worse through "cheaping". The last test, it is normal in morning and blow at noon caused by limited heatsink, too hot at rated power. If we double the mosfet for class AH branch, then it become expensive, out of cost. Then this project stopped and we focus in other project.
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Old 18th March 2010, 01:49 AM   #159
tomat is offline tomat  Indonesia
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Helloo All

sorry for my verryy late reply ,


Bobo: thank you for the nice info,i will try it

tiefbassuebertr: thank you,all my amp problem are solved ,yes,i was sent you pm's,later i will contact you through your web
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Old 8th April 2010, 03:27 PM   #160
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Quote:
Originally Posted by onto aban View Post
Is your buffer not finished yet?
My cheap is finished, all components replaced with cheaper again and again, and the sound is nothing special, but gets worse and worse through "cheaping". The last test, it is normal in morning and blow at noon caused by limited heatsink, too hot at rated power. If we double the mosfet for class AH branch, then it become expensive, out of cost. Then this project stopped and we focus in other project.
Sorry for this late answer.
Finally i used the triple EF as an output stage driven by an lme49810 @63V rails and stopped there for now.
I actually use it for my subs.
I am just finishing an aleph J and i am planning to mod it as an SRPP output. Though i need to listen to it as a stock aleph J first.
What is your new project?
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