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Old 19th August 2013, 04:24 PM   #321
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Quote:
Originally Posted by JM Popaleetus View Post
Hey all, I have a quick question in regards to the SE's output when used in voltage mode (I/V distinction may even be irrelevant to the answer).

Is the output active-balanced or impedance-balanced? Meaning is there a signal on the + and - pins, or is the - pin just impedance matched to the + pin?

Thanks!
The outputs are true balanced outputs.
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Old 19th August 2013, 08:18 PM   #322
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The outputs are true balanced outputs.
Thank you Brian.
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Old 19th September 2013, 12:05 PM   #323
Nikitas is offline Nikitas  Greece
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What is the voltage output swing of the buffalo III SE?
I checked the manual and it says about output current, but didn't find anything about voltage.
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Old 20th September 2013, 11:16 AM   #324
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Old 20th September 2013, 11:43 AM   #325
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I'm not familiar with IIISE version, but with Buffalo II

If I remember correctly,
each phase has maximum voltage swing of AVCC*0.9/2 or so, depends on the load.

high value load = more voltage swing, less current swing
low value load = less voltage swing, more current swing
virtual GND, near zero ohm = nearly no voltageswing, full current output
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Old 20th September 2013, 11:47 AM   #326
Nikitas is offline Nikitas  Greece
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Thanks for the reply!

Just a thought, with these levels, why would one need a legato, ivy d1 or anything else, and not connect the output of the dac to an i/v resistor and then straight to a power amp, say a NCORE?

Given (of course) that everything would be in the same box.
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Old 20th September 2013, 12:01 PM   #327
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It should be necessary to squeeze better THD performance.

described in the whitepaper, page4
http://www.esstech.com/PDF/sabrewp.pdf

I personally have positive experience with voltage mode - outputs followed by transformers
Good locational presentation, while it does not harm the fidelity so much.

Last edited by wktk_smile; 20th September 2013 at 12:12 PM.
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Old 20th September 2013, 12:16 PM   #328
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hmmmm, cross-read it, saw the part about the "extremely good op-amp".
So, if one connects dac->R i/v->amp like LME49990+LME49610 should be ok. So no need for a line stage.
Again, given that everything is in the same box.
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Old 20th September 2013, 01:24 PM   #329
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The ES9018's outputs are not strictly current-output, like many other DACs. Using an I/V R directly on the outputs will induce modulation of the DAC's output stages resulting in increased distortion.

If you want to bypass an output stage (and filtering), it would be better to drive the N-cores directly, though the performance will not be a good as if you used a proper active I/V stage (near 0 input impedance).
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Old 18th October 2013, 02:39 PM   #330
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what is the output voltage to the "lock" led? and which is the current-set resistor for the led? - thinking about using a blue led there which does have ~3.2v forward voltage.
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