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Old 4th August 2008, 05:39 PM   #1
Stee is offline Stee  Italy
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Default Voltage Differential Amplification

The foundation of the Burson Opamp is a sophisticated Voltage Differential Amplification network. The entire opamp is constructed from audio graded transistors and resistors. Such a design will ensure minimal colouration and maximum dynamics, but this design feature also posed a great challenge to production.

someone knows something more about this design?

http://www.bursonaudio.com/Burson_HDAM_Module.htm
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Old 4th August 2008, 10:34 PM   #2
KSTR is offline KSTR  Germany
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When I look at this and the associated comment, I'd say it's a recipe for disaster...
That is not to say that the design itself might be pretty fine, and without doubt a discrete design has more degrees of design and execution freedom than an IC design... but then again the "specifications" they give for their design is a joke. With *that* amount of info (read: zero) my conlusion would clearly be "stay away from kitchen-table stuff like that", and the rest of the talk on their site does urge me to think so even more.

- Klaus
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Old 5th August 2008, 03:54 AM   #3
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I don't know if the Burson opamp is a "disaster" as I have never tested it, however I must agree with KSTR that the information level is quite low...
However if you look at this thread: Discrete OPAMP you find a link to the John Hardy Company
http://www.johnhardyco.com which has a quite higher information level. And as I recall, Mr. Pass has also written an article on discrete opamps. Pick your choice with care
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Old 5th August 2008, 06:59 AM   #4
PMA is offline PMA  Europe
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Yes, the long wires shown in the photo that Klaus has linked will degrade and negate the whole effort.
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Old 5th August 2008, 07:01 AM   #5
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PMA; On the spot
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Old 5th August 2008, 07:06 AM   #6
Mooly is offline Mooly  United Kingdom
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Another DIY member had problems a while back with these (Burson) modules. Seem to remember there was a seperate ground wire, and there was constant noise no matter how it was connected. I don't know what the final outcome was, but agree with comments so far --- Avoid.
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Old 5th August 2008, 01:06 PM   #7
forr is offline forr  France
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Hi,

French audiophile Jérôme Prevost looking for Burson datasheet (in french, at the bottom of the page) :

http://jipihorn.free.fr/wordpress/index.php?m=200710


Burson response :

Hi Mr Prevost,
We don’t have that but you will be more than welcome to test it out your self.
Regards
Jack Thomas
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Old 5th August 2008, 02:06 PM   #8
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Google translation;

Quote:
10/25/2007
Burson: technology….
Filed under: General-jipihorn @ 9:09 am
For curiosity, I asked Burson if they had a datasheet on their operational amplifier discreet. Because even if an operational amplifier appears to be a component in almost perfect beaches of work that interests us, they are not interchangeable like that. A current offset misplaced, a gain inappropriate, inadequate and decoupling it no longer works properly. By the way, it would appear that Burson does not work well converter current / voltage output DAC.
So, least of all, when provides electronic components is to provide the relevant characteristics, as is the case of ALL known suppliers…
Answer:

Hi Mr Prevost,

We do not have that but you will be more than welcome to test it out your self.

Regards
Jack Thomas

Basically, "we did not like it, but you are welcome to do tests for yourself."

I do not know if I should laugh or not, but it is especially highlighted the seriousness behind. Mind you, given the explanations smokers site, had hardly expect better. Moreover he announced a rate distortion (<0,001%) on the site that has high chances of being put to pretty. If they really have the means to measure, why did he not deliver?

Grotesque, but finally, so in keeping with the spirit subjectivist: why give measures, since there are no correlation with listening anyway… alone!

Jipi.
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Old 5th August 2008, 03:53 PM   #9
KSTR is offline KSTR  Germany
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Quote:
Burson response :

Hi Mr Prevost,
We don’t have that but you will be more than welcome to test it out your self.
Regards
I see, their zero information policy has a good reason... oh well... maybe I should "develop" some table-saw blades and urge them to be my beta testers
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Old 5th August 2008, 05:53 PM   #10
PMA is offline PMA  Europe
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Quote:
Originally posted by ACD

Theory is, when we know everything - but nothing works!
Practice is when everything is working - but no one knows why!
Theory and practice united - nothing works and nobody knows why!
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