Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 20 - diyAudio
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Old 30th July 2014, 01:54 PM   #191
soekris is offline soekris  Denmark
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Quote:
Originally Posted by Eldam View Post
Hi Soekris,

What about this question please ?
What ate the electrical outputs data measured at J7
What can be found between the last passive filter cap on the Resistors bench and J7 ?

I try to understand if the oaps can be totally bypassed and/or if the circuit need I/V conversion or gnd after the R2R bench ?

As not a power dac and if the embeded digital attenuation is not totally loss free (ES9018 volume control hint above?), I would like to understand how can be maid the impedance adaptation before an amp if needed (mine e.g. is 100K ohms input)
WHat is the best solution : digital attenuation with a streamer à la SqueezeBox : but here we have the same theorical loss (than O can't here myself with any dac after My squeezeBox when volume control is used in it !) or SOTA ladder resistor pot in an analog pre after the DAC ? If adaptation impedance is not as important with voltage than current, it seems a good ratio for good sound is around 1/10 to 1/20 ... at least this is my simple understanding.

Sorry for the two cents question, I'm not at technician !
The R-2R DAC resistor network is output directly at J7, no parts in between. The output voltage is 1.4V RMS, the output impedance is 1.2 Kohm. The output resistance is also purely resistive, so if heavily loaded the output voltage will just be lower.

So no I/V stage is needed and it's powerful enough to connect directly to a power amplifier....

The DAC volume control is better than any external one, is done precisely in the digital domain with high resolution, and the sign magnitude DAC works the same as the level goes down. T.ex. when volume is at - 72 db it still has 16 bit resolution, just look like there is a -72 db resistive divider after it as the 12 MSB bit resistors's are connected to GND.
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Old 30th July 2014, 02:27 PM   #192
tuyen is offline tuyen  Australia
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Don't know about the rest of yous, but I'm excited about this DAC design. The IV and output stages has always involved a bunch of compromises of some sort in previous DACs I've played with. I'd be regularly thinking of possible tweaks to this or that to get 'better' sound. I never felt it was 'perfect'. Nothing's perfect I guess, but maybe this design could help relieve me from some of the stresses

Then again, how this dac will sound like is still a complete unknown and that can be bit stressful too! Lol

Last edited by tuyen; 30th July 2014 at 02:32 PM.
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Old 30th July 2014, 02:33 PM   #193
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Looks very interesting,,,and it is Danish ::::::

Best Bjarne
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Old 30th July 2014, 03:42 PM   #194
HpW is offline HpW  Switzerland
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Quote:
Originally Posted by soekris View Post
The DAC volume control is better than any external one, is done precisely in the digital domain with high resolution, and the sign magnitude DAC works the same as the level goes down. T.ex. when volume is at - 72 db it still has 16 bit resolution, just look like there is a -72 db resistive divider after it as the 12 MSB bit resistors's are connected to GND.
Well, as from the listening experiences (high resolution equipment and using acoustic music): You should drive the DAC with ALL possible bits to get the highest listening resolutions... and afterwords attenuate

while as Soren above declared, you will deal with lower used bits and you will sooner or later

Hp
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Old 31st July 2014, 03:24 AM   #195
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On list please for one ,may be two 0.02
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Old 31st July 2014, 02:06 PM   #196
Myint67 is offline Myint67  Singapore
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2x 0.02 % or 2x 0.01 pls
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Old 31st July 2014, 02:17 PM   #197
Zoran is offline Zoran  Serbia
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One + 0.02 for Me...(maybe 2?)
cheers good work
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Old 31st July 2014, 03:13 PM   #198
reodds is offline reodds  United States
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Søren, have you set up a website for definitive orders, or are you still just getting an idea of how many people are interested fro here?

Can't wait for the actual audio tests!
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Old 31st July 2014, 08:22 PM   #199
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0.02 for me
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Old 31st July 2014, 09:18 PM   #200
Raj1 is offline Raj1  United Kingdom
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0.02% = yes. Maybe a few actually for multichannel..
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