100W A classe with only 45W idle power dissipation - diyAudio
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Old 9th January 2009, 07:12 PM   #1
roender is offline roender  Romania
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Default 100W A classe with only 45W idle power dissipation

Please comment.
I know there is a patent for this type of topologies ...
The no feedback output stage has 2.5A idle current.
The classAB output stage run at 220mA idle current
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Old 9th January 2009, 07:29 PM   #2
lineup is offline lineup  Sweden
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Yes, I have seen this idea.
Even think it was mentioned in forum.
But I can not remember what that power amplifier is called.
There is even a website.

The idea is to have 2 parallel output stages.
One is only used for feedback+correction and the other is the real output stage.
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Old 9th January 2009, 07:37 PM   #3
lineup is offline lineup  Sweden
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Here it is:
The ALTMANN "SPLIF" Amplifier Topology

Click the image to open in full size.

Website: http://www.altmann.haan.de/splif_page/

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Old 9th January 2009, 07:41 PM   #4
Dag is offline Dag  Sweden
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So how does this amp handle back EMF?



EDIT:Sorry, I looked at the The ALTMANN "SPLIF" Amplifier Topology pic. Ignor my comment.....
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Old 9th January 2009, 07:46 PM   #5
roender is offline roender  Romania
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Guys,

You make a big mistake ... Take a closer look at the schematic, it is not what you think it is.
The non feedback output stage, the one which run in pure A classe, is supplied from two 12V PSU and it has a floating ground supplied by output stage of the class AB amplifier.
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Old 9th January 2009, 09:25 PM   #6
mjf is offline mjf  Austria
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hello.
plus-minus 80volt powersupply? is that right seen on the screen?
greetings............
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Old 9th January 2009, 09:48 PM   #7
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Technics SE-A1 from the late 70s.
Looks great, especially the choice of parts, still waiting for Glen-K to finish his project.
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Old 9th January 2009, 09:55 PM   #8
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The circuit was patented by Sano, Hirosha, and Hirota, #4,115,739
in 1977. Personally, I think the concept was a work of art.

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Old 9th January 2009, 10:29 PM   #9
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Quote:
Originally posted by Nelson Pass
The circuit was patented by Sano, Hirosha, and Hirota, #4,115,739
in 1977. Personally, I think the concept was a work of art.

Nelson

I know that you like the circuit, have you built it yet?
I have a copy of the patent; it was first patented in Japan in 1976.

Stinius
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Old 9th January 2009, 10:46 PM   #10
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Yes I have, and it works as advertised.

It inspired me to patent #5,343,166

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