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The Borberly EB602-200 Revisited
The Borberly EB602-200 Revisited
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Old 5th April 2019, 01:43 AM   #21
Algar_emi is offline Algar_emi  Canada
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The Borberly EB602-200 Revisited
My headphone amp is the ''All-Fet Line Amp'' EB-107/309 + ''All-FET Low Noise Regs'' EB-704/418, all dual mono with CRC filter before the Regs... According to the Line amp documentation it can drives 30 ohms in Class-A, enough for an headphone amplifier As per the doc I added a 10ohms resistor in series with the output.
Volume pot is a Noble AP25.
SB
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Old 5th April 2019, 10:10 AM   #22
EUVL is offline EUVL  Europe
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So after so many you have built, which is your reference now ?
SL Transconductance ?




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Old 3rd May 2019, 09:44 PM   #23
VivaVee is offline VivaVee  New Zealand
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Quote:
Originally Posted by EUVL View Post
Also fitted is a buffered Danyuk crossfeed in balanced mode with volume control.
.
Hi,
Would you have reference to the circuit you used?
I have Dimitri Danyuk's Electronics World August 2005 article but that is 'fully' variable.
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Old 4th May 2019, 04:31 AM   #24
EUVL is offline EUVL  Europe
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http://xen-audio.com/documents/f5ha/...ion%20V1.4.pdf

The DAO SE all-FET Class-A ZGF Headphone Amplifier
(Post #199)

The DAO SE all-FET Class-A ZGF Headphone Amplifier
(Post #203)


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Old 5th May 2019, 05:13 AM   #25
VivaVee is offline VivaVee  New Zealand
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Hi Patrick,

I managed to find the F5-HA document but I would never have found the simulation schematic/files that you referred.

Thank you very much.
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Old 5th May 2019, 05:21 AM   #26
EUVL is offline EUVL  Europe
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See also :
http://www.linearsystems.com/lsdata/...tion_Board.pdf
Ref 4,5.


Patrick
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Old 13th September 2019, 10:27 AM   #27
EUVL is offline EUVL  Europe
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There is a discussion in the Pass forum J2 thread about the MCS version discussed here in post #5.
You can easily turn this into a power amp by changing the MOSFETs to 2SJ618.
And change R10 to 0R47, R13a to 0R24, and R13b to 0R26, using 20~24V rails.
Bias will be around 1.2A.
All components are acrively available, no unobtaniums required.

And it will have a very similar signature to the J2, dominanted by H2.


Cheers,
Patrick
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Old 14th September 2019, 12:12 PM   #28
EUVL is offline EUVL  Europe
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Here is the Spice file.

2SK170 can be replaced by 2Sk209GR.
Of course you need to trim the current source to the same current.

Performance is more than decent.


Patrick

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Attached Files
File Type: asc EB602P MCS V0 THD.asc (6.3 KB, 24 views)
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Old 14th September 2019, 02:46 PM   #29
samoloko is offline samoloko  Bulgaria
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GREAT!
what a great Idea
can we use It as OPamp substitude
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