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Old 18th February 2005, 11:53 PM   #1
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Default 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.
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Old 20th February 2005, 04:49 PM   #2
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Does anyone know a good discrete buffer with balanced
output?
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Old 21st February 2005, 12:22 AM   #3
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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.
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Old 21st February 2005, 01:50 AM   #4
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Not sure what you request is.Is it balanced in/balanced out OR unbalanced in/balanced out???????
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Old 21st February 2005, 01:59 AM   #5
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Hi!I like balanced in/balanced out
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Old 21st February 2005, 02:03 AM   #6
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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.
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Old 21st February 2005, 02:41 AM   #7
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How about this circuit? will it work?
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Old 21st February 2005, 02:43 AM   #8
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cenrtailnty, but without dc-feedback
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Old 21st February 2005, 02:51 AM   #9
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Quote:
Originally posted by darkfenriz
cenrtailnty, but without dc-feedback
Sorry?
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Old 21st February 2005, 02:58 AM   #10
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Absolutely no!The COLD end would be appear like the input of a power amp grounded!
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