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Old 13th December 2008, 02:25 PM   #1
jonners is offline jonners  United Kingdom
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Default Balanced jfet buffer for Vout DAC?

I'd like to make a simple balanced buffer using jfets for my CS4397 Dac, which is voltage out. (I've just made a jfet RIAA stage, hence enthusiasm for jfets.)
I've done a lot of searching but the circuits I have found all have gain, which I don't need.
Can anyone please point me in the direction of a suitable published schematic, or give me some ideas on how to create, say, a balanced source follower?
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Old 13th December 2008, 06:19 PM   #2
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Borbely Audio

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http://www.borbelyaudio.com/special_articles.asp
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Old 14th December 2008, 11:32 AM   #3
jonners is offline jonners  United Kingdom
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Thanks. I was aware of Borbely but your post encouraged me to take a closer look. His buffer would certainly do the job, but I'm still hoping to find something a little simpler and cheaper, particularly now that 1=1Euro!
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Old 14th December 2008, 11:38 AM   #4
Zen Mod is offline Zen Mod  Serbia
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Default Re: Balanced jfet buffer for Vout DAC?

Quote:
Originally posted by jonners
I'd like to make a simple balanced buffer using jfets for my CS4397 Dac, which is voltage out. (I've just made a jfet RIAA stage, hence enthusiasm for jfets.)
I've done a lot of searching but the circuits I have found all have gain, which I don't need.
Can anyone please point me in the direction of a suitable published schematic, or give me some ideas on how to create, say, a balanced source follower?

go to Papa's B1 thread and look for version with J310 ( in last few pages) ;

make 4 channel version , two channels will give you balanced (4 for stereo)

you can't make it cheaper and simpler ;

be sure to use decent supply

edit:

here it is :

http://www.diyaudio.com/forums/showt...57#post1681957
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Old 14th December 2008, 12:56 PM   #5
jonners is offline jonners  United Kingdom
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Default Re: Re: Balanced jfet buffer for Vout DAC?

Quote:
Originally posted by Zen Mod



go to Papa's B1 thread and look for version with J310 ( in last few pages) ;


here it is :

http://www.diyaudio.com/forums/showt...57#post1681957

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Old 7th January 2009, 09:05 AM   #6
fcaton is offline fcaton  France
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Hi there,

I am a newbee, so please bear with me, and my perhaps stupid questions .... I have a few questions in the same line:

I'd like to build a discrete output stage without coupling caps for a DAC which has a DC component (2.5V).

Could this buffer be used? If not, do you know of a simple design that could do it?

Have a nice day.
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Old 7th January 2009, 09:42 AM   #7
AndrewT is offline AndrewT  Scotland
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if you don't block that 2.5V offset you will have a very onerous brief for designing the next stage.
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Old 22nd October 2010, 08:57 AM   #8
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has anyone build discrete balanced stage without DC block caps
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