Son of Dork: Active Circuitry

dorkus · 17th May 2002, 10:40 PM

The Son of Dork (SOD) project is the result of the diyAudio.com multi-channel preamp initiative (The diyAudio.com preamp project!). The project has been split into threads dedicated to discussion of the preamp's different functional units:

- General Discussion (project status, functional requirements)
- Active Circuitry
- Attenuator
- Power Supply
- Connections and Layout (including input switching)
- Chassis and Construction
- Hardware Logic, Controls, Display
- Microprocessor (programming, implementation)

I will be managing the project as a whole, as well as initially overseeing individual threads. For a background on the project, please see the original thread referenced above. A website dedicated to the project will be located at http://dorkus.org/diy/sod.

Let the fun begin!

rendisha · 17th May 2002, 11:35 PM

Hello guys,

I am an absolute beginner in DIY audio, but since there's a lot about Borbely, what do you think of his superbuffer in

http://www.borbelyaudio.com/borb502.pdf[/URL]

dorkus · 17th May 2002, 11:40 PM

the borberly DC-coupled FET line amp we were talking about (the one the single-ended guys didn't like

) is actually a tweaked-out version of the super buffer. the line amp includes source followers for additional output drive capability, and a servo for better DC stability. i suspect it sounds pretty good but i've never tried it, i'm probably going to try the full line amp version. check out the article on the borberly site on the all-FET line amp, from the 5/02 issue of AudioXPress, it mentions the super buffer.

rickpt · 18th May 2002, 01:06 AM

all cascode.....

HarryHaller · 18th May 2002, 01:19 AM

Isn't that the same 12 year old circuit that HPotter posted in the previous thread on this topic?

H.H.

Peter Daniel · 18th May 2002, 01:26 AM

I guess so. That circuit is 10 years old and looks better to me.

Ren Hoek · 18th May 2002, 01:37 AM

Not yet ready.......

rickpt · 18th May 2002, 01:50 AM

no
this is the all cascode, it has cascodes in the folower stage.

as for the older one posted on the other thread, i dont like the way borbely bias the front stage cascode. wath do you guys think about that?

regrads

rick

rickpt · 18th May 2002, 02:01 AM

older one....

HarryHaller · 18th May 2002, 03:41 AM

Stranger..... we don't discuss cascodes in front of the children and women folks 'round here. You take that kinda talk elsewhere......

H.H.

17th May 2002, 10:40 PM	#1
dorkus diyAudio Member Join Date: Jun 2001 Location: NYC	Son of Dork: Active Circuitry The Son of Dork (SOD) project is the result of the diyAudio.com multi-channel preamp initiative (The diyAudio.com preamp project!). The project has been split into threads dedicated to discussion of the preamp's different functional units: - General Discussion (project status, functional requirements) - Active Circuitry - Attenuator - Power Supply - Connections and Layout (including input switching) - Chassis and Construction - Hardware Logic, Controls, Display - Microprocessor (programming, implementation) I will be managing the project as a whole, as well as initially overseeing individual threads. For a background on the project, please see the original thread referenced above. A website dedicated to the project will be located at http://dorkus.org/diy/sod. Let the fun begin!

18th May 2002, 01:19 AM	#5
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	Borbely line stage Isn't that the same 12 year old circuit that HPotter posted in the previous thread on this topic? H.H.

18th May 2002, 01:37 AM	#7
Ren Hoek Banned Join Date: Apr 2002	Line stage Not yet ready.......

18th May 2002, 03:41 AM	#10
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	i dont like the way borbely bias the front stage cascode Stranger..... we don't discuss cascodes in front of the children and women folks 'round here. You take that kinda talk elsewhere...... H.H.

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17th May 2002, 11:40 PM	#3
dorkus diyAudio Member Join Date: Jun 2001 Location: NYC	the borberly DC-coupled FET line amp we were talking about (the one the single-ended guys didn't like ) is actually a tweaked-out version of the super buffer. the line amp includes source followers for additional output drive capability, and a servo for better DC stability. i suspect it sounds pretty good but i've never tried it, i'm probably going to try the full line amp version. check out the article on the borberly site on the all-FET line amp, from the 5/02 issue of AudioXPress, it mentions the super buffer.

18th May 2002, 01:50 AM	#8
rickpt diyAudio Member Join Date: Jan 2002 Location: portugal	no this is the all cascode, it has cascodes in the folower stage. as for the older one posted on the other thread, i dont like the way borbely bias the front stage cascode. wath do you guys think about that? regrads rick

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