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24th May 2010, 12:34 PM
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#1 |
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diyAudio Member
Join Date: Jan 2004
Location: n.e england
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N.Sano, T.Hayashi, H.Ogawa,"A high-efficiency class-A audio amplifier", AES preprint
I have not been able to find a copy of the article in the title of the thread so..... Could anyone P.M. with a copy?
It was the basis for the Technics SE-A1 hand built high end class A amp from around 1978. A certain Mr. N. Pass described the article as "a masterpiece" and was inspired by it to patent one of his own creations..... Thanks in advance, Jez. |
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24th May 2010, 01:08 PM
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#3 |
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diyAudio Member
Join Date: Apr 2004
Location: Silicon Valley
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24th May 2010, 02:07 PM
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#4 |
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diyAudio Member
Join Date: Jul 2005
Location: D-55629 Schwarzerden
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check out this pdf files:
:: Audiotek 69 - [Technics SE-A1?] :: http://www.bgaudioclub.org/uploads/d...,_B.Duncan.pdf http://www.bgaudioclub.org/uploads/d...nd_Edition.pdf Last edited by tiefbassuebertr; 24th May 2010 at 02:10 PM. |
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24th May 2010, 02:46 PM
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#5 |
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diyAudio Member
Join Date: Jan 2004
Location: n.e england
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Thanks guys but already have all the references mentioned by Tief.......
It's just an idle technical curiosity to me rather than anything commercial and I'm not curious enough to part with $20 to get it from the AES! |
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24th May 2010, 04:55 PM
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#6 |
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diyAudio Member
Join Date: Jun 2004
Location: USA
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This topology is useful for high power amps. Technics US pat. is #4115739.
Another approach, similar to Technics, is described in the Pioneer US pat. 4476444.
__________________
The truth is out there. Who can handle the truth? Last edited by StevenOH; 24th May 2010 at 05:16 PM. |
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24th May 2010, 07:15 PM
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#7 |
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The one and only
Join Date: Mar 2001
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Sano, et al inspired my patent #5343166 which replaces
floating voltage sources with floating current sources in a cascoded output stage. 
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25th May 2010, 09:39 AM
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#8 | |
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diyAudio Member
Join Date: Jan 2004
Location: n.e england
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Quote:
The problem with patents is that they are usually as clear as mud and shrouded in legalese but thanks for the references anyway. Nelson, Thanks for the insight into your own patented version. It seems to get the best out of the characteristics of mosfets 
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3rd February 2011, 02:14 AM
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#9 |
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diyAudio Member
Join Date: Nov 2009
Location: Kudus, & Malang
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#4115739 apr-1977 is better than #4476444 for me. Lagging supply in #4476444 will only happened in poor designed digital amplifier (supply swing). Amplifier work as voltage follower already gives many advantage for its digital part.
This is my digital supply with slew limited for 8KHz bandwidth (voice amplifier): Last edited by ontoaba; 3rd February 2011 at 02:18 AM. |
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