Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 KHz

zfe · 2019-10-10 6:41 pm

set filters is usually only available after you typed ###, you are then in the "settings mode".

So you did not type ### after the power cycle and still are able to use set filters?

daniel4381 · 2019-10-10 7:19 pm

zfe said:
set filters is usually only available after you typed ###, you are then in the "settings mode".

So you did not type ### after the power cycle and still are able to use set filters?

No I did not type ###, only typed " set filter = mixed", and the filter changed. But, when I type F6 it is showing invalid command.

zfe · 2019-10-10 8:35 pm

Typo form me I mean +++ not ###, sorry.
O.K. I took out my serial connection and the manual (for the right names) an tested myself:
If you see the promt # you are in the u-manager mode (the one you get if you type +++).
To get out of it you need to type exit (not quit as I wrongly said) or do a power cycle.

So if you see the #-promt after a power cycle nor do get rid of it by typing exit ... there is something wrong.

TNT · 2019-10-10 9:12 pm

F4 is a command that you cant do on the same promt as e.g. "filters all". In order to get F4 accepted, you need to enter exit. Then, F4 and e.g. V-10 is OK. But you know this right?

//

daniel4381 · 2019-10-11 9:15 am

TNT said:
F4 is a command that you cant do on the same promt as e.g. "filters all". In order to get F4 accepted, you need to enter exit. Then, F4 and e.g. V-10 is OK. But you know this right?

//

Thank you very much, it worked. F4 etc command cannot be executed from umanager, it works outside umanager. One more query, I could not differentiate the sound within the filters. I know the difference is very less and needs revealing system. My system consists frist watt m2, diy tube pre and DIY finalist speaker, so it is not a bad setup. I have installed partypack filter. I know its a silly question and already discussed. Regards

TNT · 2019-10-11 11:56 am

You hear what you hear.... really.

//

kenneth_obee · 2019-10-14 12:50 am

Hi,
My dam1021 is not working. It can lock i2s signal but there is no sound at all.
The voltages are all correct (1.2/3.3/+5/-5), however the voltage measured at caps near the resistor ladders are just 0.4v and 0v. I recall it should be +/-4v.
What might be wrong?

analog_sa · 2019-10-14 8:23 am

That should be easy to troubleshoot: reference voltage, opamp supplies, opamp outputs. The interesting question is: what did you do to break it?

Albrerta · 2019-10-14 8:11 pm

It happened to me as well, I have the v1 board and when applied Vref mod somehow screwed one channel up, measured only 0.1v.

Now I'm using external PS and this should be the ultimate solutions

see randytsuch's audio page: Soekris R2R Dam Dac - Modding for details (not my work)

Peterma · 2019-10-14 10:42 pm

very easy to break surface mount PCB's when modding , unless you have plenty of money to buy another!

kenneth_obee · 2019-10-15 2:54 am

Peterma said:
very easy to break surface mount PCB's when modding , unless you have plenty of money to buy another!

solder on the SMD compoent instead of soldering onto the PCB trace directly. This is the best way to prevent damaging the PCB by accident.

Nanekiu · 2019-10-17 9:24 pm

Is the silabs clock used actually that good, looking at the manuals for their clock the phase noise is only measured from 12 kHz to 20 MHz, and not from 10hz like the Crystek/NDK/Accusilicon.

Is it possible to replace the silabs clock in the soekris?

TNT · 2019-10-17 9:27 pm

No because the Silabs are controlled over a I2C interface which the other brands you mention don't support but is need to make the DAC work properly (or at all).

//

analog_sa · 2019-10-17 10:41 pm

Nanekiu said:
Is the silabs clock used actually that good

No, it is not, i have compared it to Crystek in Ian's fifo. But this is only critical in delta-sigma dacs.

zfe · 2019-10-18 8:08 am

Nanekiu said:
Is the silabs clock used actually that good, looking at the manuals for their clock the phase noise is only measured from 12 kHz to 20 MHz, and not from 10hz like the Crystek/NDK/Accusilicon.

Is it possible to replace the silabs clock in the soekris?

I think you mix up the RMS Phase Jitter which almost anybody specifies for the 12kHz-20MHz bandwidth - a de facto standard to make the numbers comparable and the numbers for the Phase Noise (which by the way are specified in the SI514 data sheet from 100Hz on).

The interesting question is more what at all are the relevant parameters of the clock for audio purpose? I.e. has the Jitter/Phase noise "at x Hz" of the clock any effect "at x HZ" on the audio output?

TNT · 2019-10-23 5:09 pm

After my clock insight revelation I bothered to bring out my double isolated re-clocker from IanCanada here on the forum. It's equipped with selected NDK clocks. Broke it apart and added also toslink as an output. Sound is really different. With my latest filters (TNTmode) I have never heard this DAC sounding so "real". It's almost strange at first but makes music more realistic reproduced I'm certain of. I spent 3,5 hours on the Stockholm Opera House yesterday and play some opera when I came home. Yepp - with the re-clocking the DAC is more like IRL.

So, Sören, I don't think your re-clocker work to meet your SOTA goal. Please fix 2 modes, one Movie mode (as today) and one that really don't change the clock (large buffer?) - of course longer delay is accepted in "Hifi" mode.

OAO //

PS: Excuse to those I have answered that the clock don't matter for the DAM DAC - I trusted the original description from the designer I could not believe it has this questionable implementation.

wushuliu · 2019-10-23 5:16 pm

TNT said:
After my clock insight revelation I bothered to bring out my double isolated re-clocker from IanCanada here on the forum. It's equipped with selected NDK clocks. Broke it apart and added also toslink as an output. Sound is really different. With my latest filters (TNTmode) I have never heard this DAC sounding so "real". It's almost strange at first but makes music more realistic reproduced I'm certain of. I spent 3,5 hours on the Stockholm Opera House yesterday and play some opera when I came home. Yepp - with the re-clocking the DAC is more like IRL.

So, Sören, I don't think your re-clocker work to meet your SOTA goal. Please fix 2 modes, one Movie mode (as today) and one that really don't change the clock (large buffer?) - of course longer delay is accepted in "Hifi" mode.

OAO //

PS: Excuse to those I have answered that the clock don't matter for the DAM DAC - I trusted the original description from the designer I could not believe it has this questionable implementation.

TNT, interesting. Why output the reclocker via toslink instead of using I2S?

androa76 · 2019-10-23 5:17 pm

Tnt, can you reveal little more how you did that modification with clock oscilator?
Thank you D.

TNT · 2019-10-23 6:15 pm

1) I want galvanic isolation from the data source.
2) No mod on osc on DAM. This was on IanCanadas clock board with large buffer (1 sec).

//

wushuliu · 2019-10-23 6:22 pm

Well I'm sure Nige2000 is nodding sagely wherever he is - I've used a potato flip flop reclock via I2s on multiple occasions with the 1021 and each time the result is an audibly more natural presentation. The reclocking is essential IMO - for the 1021 at least.

TNT, I'm occupied with other projects at the moment, but I intend to listen to your new filters when I get some free time...

Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 KHz

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