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Superbuffer instead of OPAMP
Superbuffer instead of OPAMP
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Old 13th December 2004, 08:13 PM   #1
Sigurd Ruschkow is offline Sigurd Ruschkow  Sweden
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Default Superbuffer instead of OPAMP

Hi All,

my preamp is still in the designphase and I am now considering using a discrete lineamp or a buffer instead of an OPamp.

As I only need 0 or maybe 6 dB of gain for my CD player and tuner,
a buffer with just some gain might be even better sounding than the best of the best of OPamps.

Borbely Audio has both a lineamp and a buffer he calls "superbuffer".

The design below looks rather straightforward and good to me.

Has anyone some knowledge of Borbely's "Superbuffer"?

Click the image to open in full size.


Sigurd
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Old 13th December 2004, 08:55 PM   #2
PMA is offline PMA  Europe
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Superbuffer instead of OPAMP
The success of Borbely's circuits depends on use of particular JFETs, many of them are discontinnued now. Are you able to get them?
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Old 14th December 2004, 06:02 AM   #3
Sigurd Ruschkow is offline Sigurd Ruschkow  Sweden
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I plan to buy the kit. That is the easiest way to get the components
Also, I do not have the facility to make a PCB, so it will be the kit.


Sigurd
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Old 14th December 2004, 06:36 AM   #4
Upupa Epops is offline Upupa Epops  Czech Republic
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Go on, this is best solution, Borbelly's things are excellent, 'cos he has it in own head quite clear .
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Old 14th December 2004, 07:30 AM   #5
Sigurd Ruschkow is offline Sigurd Ruschkow  Sweden
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Upupa - what kind of experience do you have of Borbely's designs? How did it sound? Any problems?



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Old 14th December 2004, 08:32 AM   #6
PMA is offline PMA  Europe
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Superbuffer instead of OPAMP
Borbely's amps are one of the sources of design of the Upupa Epops's amps (see driving stage of dc102 for example). And the UE amps are one of the best I have ever heard.
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Old 14th December 2004, 08:36 AM   #7
peranders is offline peranders  Sweden
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Superbuffer instead of OPAMP
Sigurd, notice that Erno's buffer actually is a current feedback amp but his thig is to use jfet's and mosfets.

I'll imagine that his amp is pretty good if you can get good transistors. I have also want ed to make soem good jfet amp but good jfets are a bit hard to get in Sweden and I'm too lazy to import.....

Erno's design is pretty straight forward and there are no weird things.
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Old 14th December 2004, 11:07 AM   #8
patriz is offline patriz
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I have built the Borberly all fets crossover that employ the superbuffer.
It was a real pain to find all the fets, some were bought directly from Erno, but I was rewarded with a wonderfully sounding xo .
It is by a wide margin better than my previous opa604 based xo.
Strongly reccomended..
Giorgio
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Old 14th December 2004, 11:12 AM   #9
hjelm is offline hjelm  Sweden
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As for JFET's in Sweden. Bhiab Bhiab site Had some that i couldn't find aywhere else, in sweden. But since you are buying the kit then it doesn't matter.
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Old 15th December 2004, 03:50 PM   #10
Sigurd Ruschkow is offline Sigurd Ruschkow  Sweden
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One can buy the JFETs for the super buffer from Toshiba in Japan. None of them are discontinued.



Sigurd

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Originally posted by PMA
The success of Borbely's circuits depends on use of particular JFETs, many of them are discontinnued now. Are you able to get them?
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