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Old 3rd January 2004, 07:22 PM   #21
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Quote:
Originally posted by theChris


just out of curiosity, how is that IC balenced
I think it is not balanced too.

However, if you put two buffers in front of it, then the whole thing should be balanced,
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Old 3rd January 2004, 07:37 PM   #22
usekgb is offline usekgb  United States
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What about using the BB INA134 for converting balanced to unbalanced? It looks like a great chip: INA134 .

Cheers,
Zach
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Old 4th January 2004, 06:25 AM   #23
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that IC looks to have the same issue as the previous ones -- it does convert a voltage differance into a voltage with respect to a referance, but it does not have equal input impedances unless the voltage at both terminals is 0v. i would think a true IN-AMP would be required to get both conditions -- same noise on both lines and differential inputs.

The high CMRR of the chip is nice though, as the noise rejection will be affected by the ability to reject common-mode signals, but the input imedance of the inverting terminal is a function of the signal on the output.
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Old 4th January 2004, 11:54 AM   #24
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"I guess the fuzz is that +in has 110k impedance to GND and -in 9.1k impedance to gnd in your case."

Close, the inverting input would be 10K. Hardly qualifies as balanced, do you think?

SE is right, transformers are a better solution.

Studio and pro gear frequently had octal sockets for your transformers. You invest in good transformers and keep them when you sell the gear.

Jensen makes some of the best.

Electronically balanced inputs are a waste of time and money, even those with laser trimmed CMRR.

http://www.edcorusa.com/sound/matchers/s2s10k_10k.htm

90% of the Jensen quality for 10% of the price.
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Old 6th January 2004, 02:40 PM   #25
usekgb is offline usekgb  United States
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I do agree with using the Jensens. I was just trying to find a more cost effective alternative to this problem. You would be surprised how little pro gear is loaded with transformers these days.

Cheers,
Zach
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