buffer with balanced output

udip · 18th February 2005, 11:53 PM

Hi all,

I'm looking for a simple discrete line buffer, that could be
direct coupled, could drive 1k load, and most important,
that will have balanced output.

I was thinking about borbely fet buffer (figure 15c in JFETS 2
article on his website), since in theory it has zero offset.
Can I get balanced output from such a simple circuit, by
taking the cold output from a resistor in series with ground?
(I think that most important thing in balanced lines is that the
reciever should see equal impedances at both inputs),
And if so, what should be the resistor value?

Thanks in advance,

Udi.

udip · 20th February 2005, 04:49 PM

Does anyone know a good discrete buffer with balanced
output?

udip · 21st February 2005, 12:22 AM

Hi,

Borbely has a balanced line amp design, and I wonder if
I could use feedback in order to control gain.
The problem is that it's balanced, so I don't know exactly how
to do it.
Maybe I can use two feedback paths, from outputs
to inputs? Any ideas?

Thanks,

Udi.

Leolabs · 21st February 2005, 01:50 AM

Not sure what you request is.Is it balanced in/balanced out OR unbalanced in/balanced out???????

thanh · 21st February 2005, 01:59 AM

Hi!I like balanced in/balanced out

udip · 21st February 2005, 02:03 AM

Quote:

Originally posted by Leolabs
Not sure what you request is.Is it balanced in/balanced out OR unbalanced in/balanced out???????

Hi,

I'm looking for a buffer with unbalanced input and balanced outputs. If it haz balanced input, that's ok, cause I can always tie one input to ground.

The problem I have is how to control the gain in the circuit,
because it's unknown to me... I need gain between 0-6 db...

Udi.

udip · 21st February 2005, 02:41 AM

How about this circuit? will it work?

darkfenriz · 21st February 2005, 02:43 AM

cenrtailnty, but without dc-feedback

udip · 21st February 2005, 02:51 AM

Quote:

Originally posted by darkfenriz
cenrtailnty, but without dc-feedback

Sorry?

Leolabs · 21st February 2005, 02:58 AM

Absolutely no!The COLD end would be appear like the input of a power amp grounded!

18th February 2005, 11:53 PM	#1
udip diyAudio Member Join Date: Oct 2004 Location: Israel	buffer with balanced output Hi all, I'm looking for a simple discrete line buffer, that could be direct coupled, could drive 1k load, and most important, that will have balanced output. I was thinking about borbely fet buffer (figure 15c in JFETS 2 article on his website), since in theory it has zero offset. Can I get balanced output from such a simple circuit, by taking the cold output from a resistor in series with ground? (I think that most important thing in balanced lines is that the reciever should see equal impedances at both inputs), And if so, what should be the resistor value? Thanks in advance, Udi. __________________ "Things should be as simple as possible, but no simpler" Albert Einstein

20th February 2005, 04:49 PM	#2
udip diyAudio Member Join Date: Oct 2004 Location: Israel	Does anyone know a good discrete buffer with balanced output? __________________ "Things should be as simple as possible, but no simpler" Albert Einstein

21st February 2005, 01:59 AM	#5
thanh diyAudio Member Join Date: Jan 2004 Location: ho chi minh city	Hi!I like balanced in/balanced out __________________ Justice for Victims of Agent Orange http://www.petitiononline.com/AOVN/Thank all of you!

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21st February 2005, 01:50 AM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Not sure what you request is.Is it balanced in/balanced out OR unbalanced in/balanced out???????

21st February 2005, 02:43 AM	#8
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	cenrtailnty, but without dc-feedback

21st February 2005, 02:58 AM	#10
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Absolutely no!The COLD end would be appear like the input of a power amp grounded!

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