Simple DSD modulator for DSC2

[merlin el mago]

Mine Chronus uses NDK XXXSDA oscillators

 

[Markw4]

I2SoverUSB also uses SDA NDK clocks. But the implementation of I2SoverUSB sounds distinctly more clean and less jittery to me. Shielding Chronus in a steel box seemed to help some.

 

[merlin el mago]

I don't know I2SoverUSB but mine Chronus don't need any shielding.

 

[merlin el mago]

That's the best setup for me:
Amanero (clock slave)>Chronus>Simple DSD modulator>low pass filter>step-up?
Amanero (clock slave)>Simple DSD modulator>Chronus>low pass filter>step-up?

To power the Simple DSD modulator could I share the same 5V powering the Chronus or it's better separate PSU?

No one can help?

 

[gentlevoice]

@merlin el mago: Hi ... This is not a reply based on insights into neither the Cronus or the Simple DSD modulator but if it were me I would use separate supplies so as to not have noise from the Cronus pass onto the DSD modulator and vice versa.

I don't know what the required voltages are for the DSD modulator but for trial listenings (and maybe also assessing whether the Cronus PSU can be used for both - beware of current limitations & different voltages) I reckon batteries could be used... ?

Don't know if this helps but just my two cents ...

Have a good weekend,

Jesper

 

[merlin el mago]

Thanks Jesper

 

[merlin el mago]

That's the best setup for me:
Amanero (clock slave)>Chronus>Simple DSD modulator>low pass filter>step-up?
Amanero (clock slave)>Simple DSD modulator>Chronus>low pass filter>step-up?

To power the Simple DSD modulator could I share the same 5V powering the Chronus or it's better separate PSU?

No one to help where to put in the chain the Simple DSD modulator?

TIA
Felipe

 

[nautibuoy]

No one to help where to put in the chain the Simple DSD modulator?

TIA
Felipe

I would put the Cronos after the modulator to provide reclocked data to the filter.

 

[Markw4]

The idea is that you want very low jitter by the time native DSD data and clocking reaches a DSD dac. How to best do that in the diy world is still not quite clear. Chronus at first glance might seem like a good option. For those seriously considering various other options, happy to try to respond in the forum proper, or by PM.

 

[nautibuoy]

Just thinking about this, and assuming that the 'low pass filter' is a simple passive single-ended RC (or LC) low-pass filter approach (i.e. a NoDAC), is jitter/reclocking even relevant as no clock signal is used in this type of DSD 'decoding'?

 

[MarcelvdG]

The circuit driving the low-pass filter needs a clean clock, otherwise the signal driving the filter gets phase modulated by the dirty clock, which may mix out-of-band quantization noise or idle tones into the audio band (among other issues).

 

[merlin el mago]

Thanks guys, make sense. At first I will increase mA power at Ubib to feed the Chronus & the Simple DSD modulator, later will make his own separate regulator for the Simple DSD modulator.

 

[merlin el mago]

The purpose of the white connector it's to program the Xilinx right?

 

[Markw4]

The white connector is for JTAG programming of the Xilinx. Doesn't have to be that kind of connector though. A pin header could also work. Depends on the cables and adapters than come with your JTAG programmer.

 

[merlin el mago]

Thanks Mark.

 

[adiaz]

Is anyone using Xing U30 with dsc2 and hqplayer?

I bought the xing u30, but pin 11 mute is always "on" (3.3v)

I use it with Hqplayer, the xing is recognized and hqplayer works, but there is no sound on the dac because pin 11 mute is always "on" (3.3v)

Can someone who has the xing u30 with hqplayer if is playing check if pin 11 mute goes "off" (0v)?

I have other dsc2 work with amanero, and the pin 11 of the amanero goes "off" (0v) when hqplayer is playing.

 

[MarcelvdG]

Does mute go low when there is a reason to mute? I know some USB to I²S interface boards have active low mute outputs.

 

[adiaz]

Does anyone have the xing U30 working?

If so...

Can you measure if mute pin 11 changes to "off" (0v) when sending audio on dsd?

 

[adiaz]

Xing u30 usb:

Supposedly this setting is for the pin 11 mute function...

Is that so?

Pin 11 in my Xing U30 never change with playing in the hqplayer, always is "on" (3,3v)

 

[Markw4]

Mute should change state briefly when switching from 44kHz family sample rates to 48kHz family or vice versa. Also Mute should be briefly asserted when switching between PCM and DSD. Things like that. You might need a scope set to trigger on a state change to see it.

Other than that, some Mute signals are active high and some are active low. Depends on the USB board and its firmware.

Here I am getting ready to test the Simple DSD Modulator using I2SoverUSB rather than Amanero. I had to add an inverter on I2SoverUSB Mute signal since its the opposite from Amanero.