Nick,
The 1Vrms/2Vrms is great news. I have a device that is a little over 1Vrms.
Could the mod be done on old board. I have good soldering skills??? Even if it is to be fixed at 2Vrms all the time I think I could live with this...
Also I asked on a earlier post if it's possible for you to compile the NUC in Linux so that it could be use on a Raspberry PI. I could be drop in the enclosure easily and could give a sort of "onboard" programmable solution.
Thank you
zoula
The 1Vrms/2Vrms is great news. I have a device that is a little over 1Vrms.
Could the mod be done on old board. I have good soldering skills??? Even if it is to be fixed at 2Vrms all the time I think I could live with this...
Also I asked on a earlier post if it's possible for you to compile the NUC in Linux so that it could be use on a Raspberry PI. I could be drop in the enclosure easily and could give a sort of "onboard" programmable solution.
Thank you
zoula
I'll try to give as much freedom as possible.
Yes, prospected rates are 4:1 and 16:1.
No you cannot do that: output buffers include anti-alias filters.
That will take some time I'm afraid. I need first to finalize NUC, further to that we'll see if a Mac port is still doable.
Easy way: put a 10 kOhms resistor in series with your source.
Otherwise, the clean way you need an attenuator - which is a simple resistor voltage divider. For example 9kOhms and 4.5 kOhms.
Hm, compiling NUC for the rPi wouldn't be straightforward. I don't think this will be ever done, sorry.
I have now the new interface kits in stock.
Main board PCBs are expected tomorrow or on Monday. Further to that, I'll set a date with the plant for assembling the parts. Could take 3 weeks before I can ship again.
I don't have yet a date for the release of the new NUC. There will be in the meantime an intermediary release enabling the external clock input.
Input impedance is 9 kOhms, output impedance is 150 Ohms.
Cheers,
Nick
I am more specifically talking about the antialiasing filter that has to be applied before the downsampling stage in the decimation process.
When doing a x4 or x16 decimation the new Nyquist frequency is /4 or /16, and information above this frequency has to be removed (attenuated...).
If the LP filter is gentle (like in the Four Audio approach) then it has to be taken into account somewhat and compensated by either the FIR generation software or the convolution engine itself in order to get a large enough usable passband.
When doing a x4 or x16 decimation the new Nyquist frequency is /4 or /16, and information above this frequency has to be removed (attenuated...).
If the LP filter is gentle (like in the Four Audio approach) then it has to be taken into account somewhat and compensated by either the FIR generation software or the convolution engine itself in order to get a large enough usable passband.
i2S input selection problem
I keep getting the same problem that the i2S input is not showing up as an option to choose in the menu. I am not able to select the i2S (WaveIO).
I checked I bridged pin 13 to pin 10, IS_EXT1\ to DGND. Several times I was able to connect it and listen and enjoy music. I2S was always there when I use the Standby switch.
But when I disconnect Najda from mains AC and start it up again. It has lost the selection option i2S. Then after a lot attempts switching it on/off with and without STBY and or Mains it shows up rarely and for no obvious reason.
I don't know what's wrong, maybe, I hope, someone has an idea to solve the problem.
Peter
I keep getting the same problem that the i2S input is not showing up as an option to choose in the menu. I am not able to select the i2S (WaveIO).
I checked I bridged pin 13 to pin 10, IS_EXT1\ to DGND. Several times I was able to connect it and listen and enjoy music. I2S was always there when I use the Standby switch.
But when I disconnect Najda from mains AC and start it up again. It has lost the selection option i2S. Then after a lot attempts switching it on/off with and without STBY and or Mains it shows up rarely and for no obvious reason.
I don't know what's wrong, maybe, I hope, someone has an idea to solve the problem.
Peter
i2S
Is it possible to hardwire i2S input. I don't care for the other inputs e.q. coax, analogue, optical). As a last option.
Peter
Is it possible to hardwire i2S input. I don't care for the other inputs e.q. coax, analogue, optical). As a last option.
Peter
Hi, the connection between pin 13 and 10 is permanent in your build? Did you solder the pins with a short cable? Did you verify that pin 13 is really connected to ground? Use a tester and go to ground of mains connection and verify if Pin 13 is really attached to ground
How do you select I2S with NUC or with the remote?? How did you connect WAveIO. I wonder a little bit, never had such a problem with I2S! Not with WveIO, Amanero or Hexasound
regards
Sigi
Hi Siginitz, I measured pin 13 really is attached to GND. Trying to select with the expansionboard is almost impossible and unpredictable. I2S does not come forward.
I think i have better results when I use NUC. But again, after a few attempts. Now I leave Najda on Stand-by so it remembers settings. But when I disconnect from mains, the whole story repeats itself. I have got both WaveIO and Najda connected to the same Smps, so they are simultanously started. I2s is fed by 3,3 VDC of Najda.
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I think i have better results when I use NUC. But again, after a few attempts. Now I leave Najda on Stand-by so it remembers settings. But when I disconnect from mains, the whole story repeats itself. I have got both WaveIO and Najda connected to the same Smps, so they are simultanously started. I2s is fed by 3,3 VDC of Najda.
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Hi Nick,
In post # 18 you mentioned about your first product "The light version would have no analogue volume control, and volume would be handled digitally in that case". Will this new version have digitally controlled volume of the digital domain as I want to use external dacs tied directly to my amps thus having a volume control in the digital domain not analogue is desirable.
Thanks,
In post # 18 you mentioned about your first product "The light version would have no analogue volume control, and volume would be handled digitally in that case". Will this new version have digitally controlled volume of the digital domain as I want to use external dacs tied directly to my amps thus having a volume control in the digital domain not analogue is desirable.
Thanks,