Can i ask is the native 512DSD using diyinhk on Linux ? Did not know diyinhk can do 512 DSD on linux, thought we have to get the windows driver from diyinhk can do 512DSD on windows...
i have 2 diyinhk card on the way to try 1024DSD once i figure a way to do it...
Has anyone measured frequency response after RC filter?
I got pretty strange results, amplitude starts to drop slowly after 12Khz.
I got pretty strange results, amplitude starts to drop slowly after 12Khz.
intresting DIYINK now offers a fully featured Windows driver for Native DSD playback. DIYINHK USB Audio Driver [Full Version and Signed] - DIYINHK
There's a potential common denominator with some of these noise issues; I experienced noise when using my Silk TVC when I had no noise before, you have the same and Hazard has also had the problem when he introduced a TVC in place of his Llundahls? Maybe nothing but maybe worth checking out.
Ray
My Intact Audio AVC can drive this small DC but I think will be better to have no DC offset, I use tube gear after AVC with an input impedance of 470K or 1M so I guess I don't need a higher output capacitor, still I don't know the purpouse of 47K output resistor?
@merlin el mago The 47K is part of output high pass filter.
@nautiboy I have another noDAC with Amanero (and without high pass filter) and the noise is normal... for a project of this type.
Maybe wiring is not right... See photo
Some ideas?
@nautiboy I have another noDAC with Amanero (and without high pass filter) and the noise is normal... for a project of this type.
Maybe wiring is not right... See photo
An externally hosted image should be here but it was not working when we last tested it.
Some ideas?
I think not, I guess is to discharge the output capacitor giving the path to ground.
Low pass filter is 3300 ohm/1nF for around 48000 Hz cut frequency.
I don't think lowering this could change something, because there is noise also without the signal.
I have the same behavior with TVC connected or not.
My first idea was to disconnect the 47k resistance and leave only the big russian green capacitor at the output.
I don't think lowering this could change something, because there is noise also without the signal.
I have the same behavior with TVC connected or not.
My first idea was to disconnect the 47k resistance and leave only the big russian green capacitor at the output.
Just disconnected the 47k resistor: same noise.
I have made a track of the noise (normalized!). You can hear it here:
http://www.tophifi.it/ftp/Internet/noise.wav
I have made a track of the noise (normalized!). You can hear it here:
http://www.tophifi.it/ftp/Internet/noise.wav
Has anyone had any definitive confirmation that this "nodac" method sounds better then a normal DAC? Or is this just another way to skin a cat?
I have an answer from DIYHNK about the noise I am experiencing:
"Thank You for interesting in our product,
Class-D power amplifier is also drive by PWM,
but there seems many problem to solve with this simplified arrangement.
The output from xmos as well as other clpd is designed to connect other digital device, it will overheat, damage, distort if it is overload.
Large capacitor also have large self leakage, I think it cannot be charged directly by digital device with only a few mA output easily. It will need to be charged and dischanged at the PWM frequency."
"Thank You for interesting in our product,
Class-D power amplifier is also drive by PWM,
but there seems many problem to solve with this simplified arrangement.
The output from xmos as well as other clpd is designed to connect other digital device, it will overheat, damage, distort if it is overload.
Large capacitor also have large self leakage, I think it cannot be charged directly by digital device with only a few mA output easily. It will need to be charged and dischanged at the PWM frequency."
I will also be testing direct DSD in upcoming weeks/months, thanks for the thread starter for the great idea!
The signal path will be going like this:
Melodius Audio USB-DSD box via RJ45 --> RJ45-input on Audio Note Kits DAC 5.1 Signature which has Noguchi FM-1010N line stage trans in 1:2 step up mode --> 101D-tube --> Noguchi FM-10k-600CT output trans. From here the signal goes to Coincident Statement Line Stage which has a 80% nickel C-core Permalloy TVC in the input (made by J&K) --> 101D-tube again --> Noguchi FM-10K-600CT output trans. From here to Line Magnetic LM210IA or LM219IA, which have high quality SiFe-output trannies (LM219IA also has IT-tranny between 300B and 845 tube).
There are quite many transformers in the signal path that will low pass the signal. I planned I won't be using any RC-filtering.
I will be comparing the result with Audio Note's CS8414/AD1865 based nos DAC with current output that goes through the exact same signal parth as the DSD signal will go through. The AD1865 sounds wonderful.
There are couple of concerns:
1) will the DSD signal from XMOS contain a DC-component/DC-offset (should I use series caps before the tranny). Melodious audio has SE/non-differential outputs I believe.
2) Which pins do I take the signal from - I have understood that it's the DATA (left ch) and LRCK (right ch).
3) Does somebody know what is the output voltage of the DSD signal from XMOS? And the output is voltage out, not current out, right, so no need for I/V-resistor?
There seems to be a op-amp buffer, perhaps buffering the I2S/RJ45 output... or not?
The signal path will be going like this:
Melodius Audio USB-DSD box via RJ45 --> RJ45-input on Audio Note Kits DAC 5.1 Signature which has Noguchi FM-1010N line stage trans in 1:2 step up mode --> 101D-tube --> Noguchi FM-10k-600CT output trans. From here the signal goes to Coincident Statement Line Stage which has a 80% nickel C-core Permalloy TVC in the input (made by J&K) --> 101D-tube again --> Noguchi FM-10K-600CT output trans. From here to Line Magnetic LM210IA or LM219IA, which have high quality SiFe-output trannies (LM219IA also has IT-tranny between 300B and 845 tube).
There are quite many transformers in the signal path that will low pass the signal. I planned I won't be using any RC-filtering.
I will be comparing the result with Audio Note's CS8414/AD1865 based nos DAC with current output that goes through the exact same signal parth as the DSD signal will go through. The AD1865 sounds wonderful.
There are couple of concerns:
1) will the DSD signal from XMOS contain a DC-component/DC-offset (should I use series caps before the tranny). Melodious audio has SE/non-differential outputs I believe.
2) Which pins do I take the signal from - I have understood that it's the DATA (left ch) and LRCK (right ch).
3) Does somebody know what is the output voltage of the DSD signal from XMOS? And the output is voltage out, not current out, right, so no need for I/V-resistor?
There seems to be a op-amp buffer, perhaps buffering the I2S/RJ45 output... or not?
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