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Old 9th May 2009, 08:53 AM   #1
kees52 is offline kees52  Netherlands
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Default Current-feedback amp, 150 a 200 watt.

Hi

I have search the schematic of the amp I designed some years ago.

I have draw it in multisim and want to share it.

it sounds very good and is super fast, bandwith 10 to 500 khz with ease, without low pass it will go to 1 mhz.

it sounds quite warm.. and simple to build.
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File Type: pdf topamp.pdf (40.9 KB, 495 views)
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Old 9th May 2009, 10:12 AM   #2
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Did you build it? For those who don't know, this is the patented "Alexander amp", Analog Devices. I got (finally) permission from Analog Devices to use it in my headphone amp QRV03. The design is more suited for higher supply voltage. It sounds good.

The original article can be found here
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Old 9th May 2009, 10:54 AM   #3
kees52 is offline kees52  Netherlands
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no it is not the alexander amp it is simulair that,s right..

he use only the first part with the opamp, this I have used.

he use in the output stage mosfets and igbt,s, with these I use bipolairs, I have changed a lot there, these sounds better and are more robuust than the orginal alexander amp...

also I use differend opamps.

but is similair I now, everybody use the already invented wheel, because it is al so similair with amps.

I have build these after simulation and tuning, it is tested in a high end store where the people are very pleased of the tightness and speed, call it even 3D sound, warm smooth, no harsness, I have this in my home for some years without problems, but now I use hybride with tubes, dc coupled with also a offsetcontrol because of the drift from tubes, use the EL84 CCS loaded in triode mode as mosfet driver on 30 ma and the ECL200 penthode-triode as kimmel mu stage, these sounds very good, more tube like with the fast punch of mosfets, no feedback...

in the alexander amp are also errors, like with the offset control who has to high lowpass and wrong resistors (wrong place).

The igbt version is unstable.
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Old 9th May 2009, 11:39 AM   #4
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What I ment want was that the topology was the same, not an exact copy. Using IGBT's has turned out not to be so successful either.
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Old 9th May 2009, 12:04 PM   #5
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Default simple and interesting

any draw backs ????
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Old 9th May 2009, 12:49 PM   #6
kees52 is offline kees52  Netherlands
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hi peranders


yes I now, it is the same topologie.

here is the schematic of the amp I now use, like to share things with people.

it is a hybride, and it sounds almost like a tube amp, but you hear that er are solid state components.

I use the CCS as a offset tracker, it keeps the amp independent of drift because of the tubes used and the dc coupled to the mosfets.

the 6L6 is in my amp a EL84.

I have try igbt,s also in this hybride amp, these are prone of a big unstabile change of current it is almost impossible to stabilize and the sound is bad..
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File Type: pdf hybride-mustage.pdf (41.4 KB, 216 views)
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Old 11th May 2009, 09:08 AM   #7
kees52 is offline kees52  Netherlands
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here a differend version with a other voltage stage, simpeler to make.

you can use every tube with a mu of minimum 60 on 5 ma.
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File Type: pdf hybride-mustage1.pdf (41.4 KB, 126 views)
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Old 11th May 2009, 12:35 PM   #8
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Hallo Kees, je bent er maar druk mee (You're quite busy!)

I sometimes am in your town, maybe I'll stop by one time and have a listen??

Jan Didden
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Old 11th May 2009, 07:56 PM   #9
kees52 is offline kees52  Netherlands
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hoy janneman


mag hoor, maar zit hier net en het is wel rommeltje met de schoorsteen en de kachel, plus gaan ze hier verbouwen waarop ik wacht met het aanpakken van het huis.

youre welkome, but it is a little mess here, I am just moved to this house and busy with the chimney and a woodstove..
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Old 23rd November 2009, 05:35 PM   #10
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Default What about the slew rate

Hi,

Did you take some measure about the slewrate of your ampli?
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