N.Sano, T.Hayashi, H.Ogawa,"A high-efficiency class-A audio amplifier", AES preprint - diyAudio
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Old 24th May 2010, 12:34 PM   #1
jez is offline jez  United Kingdom
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Default 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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Old 24th May 2010, 12:54 PM   #2
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N. Pass must be Nelson Pass.
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Old 24th May 2010, 01:08 PM   #3
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AES E-Library: High Efficiency Class A Audio Power Amplifier (Class A+ Amplifier)
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Old 24th May 2010, 02:07 PM   #4
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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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Old 24th May 2010, 02:46 PM   #5
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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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Old 24th May 2010, 04:55 PM   #6
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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.
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Last edited by StevenOH; 24th May 2010 at 05:16 PM.
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Old 24th May 2010, 07:15 PM   #7
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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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Old 25th May 2010, 09:39 AM   #8
jez is offline jez  United Kingdom
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Quote:
Originally Posted by StevenOH View Post
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.
I would have thought that the main use for the topology would be to make it practical to build 50 - 100 W etc "class A" amps, i.e. without heatsinks that double as central heating. For true high power amps other topologies such as class G or H would be more appropriate.
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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Old 3rd February 2011, 02:14 AM   #9
ontoaba is offline ontoaba  Indonesia
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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):
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Last edited by ontoaba; 3rd February 2011 at 02:18 AM.
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Old 3rd February 2011, 02:49 AM   #10
ontoaba is offline ontoaba  Indonesia
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I forgot it. If the supply swing in #4115739 lag, it will also happen in #4476444, so there is no improvement in #4476444.

Faster version, it will cost less in eficiency.
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