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Signalyst DSC1
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Old 21st August 2015, 07:00 PM   #111
Nic.M is offline Nic.M  Canada
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Join Date: Jan 2004
Location: North Vancouver, B.C.
Quote:
You could ask Amanero about the mute control and what possibilities there would be for having longer unmute/mute time delta in respect to the output data.
I will do that and hope for a response.

In the meantime, I could always install Windows on my music dedicated Mac mini. (SSD, outboard power supply, custom fan control, separate USB voltage, etc., etc.)

I like the sound of your discrete DAC and the resampling to DSD enough to take a shot at it, if I can get those nasty noises under control.

Nic
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Old 21st August 2015, 09:50 PM   #112
gentlevoice is offline gentlevoice  Denmark
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Join Date: Oct 2007
Location: Denmark
Signalyst DSC1
@Nic.M:

Quote:
Yes, I have been slowly wading through the long Amanero thread, tedious reading(I am on page 93 of 150 or so.) There was only one post so far of
clicking noises but nobody seems to have paid much attention to it. I will struggle on with it in the hope of finding something helpful.
Yes, I also find it to be a quite long thread and I haven't read it myself in its entirety ... A suggestion could be that you post a question about your issues in the thread ...

I've read through my notes on the amanero thread and I haven't noted anything about solving the click issue although I remember reading something about it somewhere in the thread.

About the asynchronous setup it's done in hardware and to my knowledge not in the software. Acko has made a reclocker for the Amanero (link here: Amanero Isolator/Reclocker GB) and via this reclocker it's possible to lead the clock signal back to the amanero board and use it here instead of the onboard mounted oscillators (it can be setup in the amanero software).

This - which TMK is synchronous playback - may reduce jitter but in my experience introduces clicks and playback stops. Yet to my ears it's somewhat better sounding than asynchronous playback ...

And the sound with the reclocker (again to my ears) I would say is quite beyond the sound without the reclocker.

Asynchronous playback is where the amanero uses its onboard oscillators and outputs the data & clock signals to the Acko board timed by these onboard oscillators, however, the acko board's flip-flops are clocked using the clock coming from the acko board's oscillators.

In my understanding unless both the Amanero & the Acko board's oscillators have entirely identical timings (which over time is unlikely) the timing distances between the two clocks may vary - potentially also introducing slips in the clock/data stream. I don't notice this, though - except possibly at 384 kHz.

I hope this may be an accessible explanation - & good luck in finding a solution

Cheers,

Jesper
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Old 23rd August 2015, 01:26 AM   #113
Nic.M is offline Nic.M  Canada
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Join Date: Jan 2004
Location: North Vancouver, B.C.
I am happy to report that I finally got noise free playback with the DSC1.

This was using my Mac Book Pro which runs Windows 7 with Boot Camp.
With the invaluable help of my computer whiz friend Oscar, and after loading the Amanero drivers, Asio and various tools, we set up JRiver to play back in non-DoP mode and converted everything to 2 times DSD.

This works with very few glitches and minimal switching and stop-start noise.

I have not tried using HQ Player, because I have not installed it on the laptop, yet. I miss its flexibility on how the conversion/upsampling is done.
Will set it up soon.

Thanks for the help and advice, Gentlevoice and Signalyst especially to Signalyst for designing such a great piece of gear and making it open to DIYers.

Nic.
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Old 1st September 2015, 11:41 AM   #114
4est is offline 4est  United States
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Location: Grand Rapids, Mi
Yes, thank you Jussi!
Quote:
Originally Posted by Nic.M View Post
especially to Signalyst for designing such a great piece of gear and making it open to DIYers.

Nic.
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Old 11th September 2015, 03:01 AM   #115
mcluxun is offline mcluxun  United States
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Join Date: Nov 2010
Here's some recent changes I've made to the DAC.
First, resistor network boards using 0.05% SMD resistors:
Click the image to open in full size.
Second, use diyinhk isolator board and powered by local 3.3v.
Click the image to open in full size.

I also got a QA400 that I've been playing around with. Here are some result:

Unmodified:
Click the image to open in full size.

Stock DSC1 + TPS 5v power supply:
Click the image to open in full size.

Stock DSC1 + TPS 5v power supply + 0.05% resistors:
Click the image to open in full size.

Stock DSC1 + TPS 5v power supply + 0.05% resistors + isolator:
Click the image to open in full size.
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Old 11th September 2015, 03:04 AM   #116
mcluxun is offline mcluxun  United States
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Moreover, I'm playing with a i/v stage inspired by this thread: http://www.diyaudio.com/forums/digit...ad844-i-v.html
Plus a pull down resistor, so the output from the resistor networks wont be 0-5v with 2.5v DC.

I'd like to see by doing that, if I could remove the capacitor after i/v.
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Old 11th September 2015, 06:56 AM   #117
gentlevoice is offline gentlevoice  Denmark
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Signalyst DSC1
Hi mcluxun,

Interesting changes you've made ... your QA400 measurements makes me wonder, though, if you might have some kind of "systematic difference" somewhere since Jussi's own measurements of the DSC-1 are somewhat better (1 kHz sine wave fig 5 of 6; DSD128):

Preliminary measurement results for the DSC1 DAC - Blogs - Computer Audiophile

Just FYI.

Cheers,

Jesper
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Old 11th September 2015, 07:30 AM   #118
gentlevoice is offline gentlevoice  Denmark
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Join Date: Oct 2007
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Signalyst DSC1
... just came to think of a question possibly related to this sentence of yours:

Quote:
I'd like to see by doing that, if I could remove the capacitor after i/v.
Have you tried to measure what the DC level is just after the 15k resistors (i.e. before the first AD844) when not playing music? And if so can you say if it is stable DC-wise (maybe at * VCC)?

Cheers,

Jesper
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Old 11th September 2015, 03:38 PM   #119
mcluxun is offline mcluxun  United States
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Join Date: Nov 2010
Quote:
Originally Posted by gentlevoice View Post
Hi mcluxun,

Interesting changes you've made ... your QA400 measurements makes me wonder, though, if you might have some kind of "systematic difference" somewhere since Jussi's own measurements of the DSC-1 are somewhat better (1 kHz sine wave fig 5 of 6; DSD128):

Preliminary measurement results for the DSC1 DAC - Blogs - Computer Audiophile

Just FYI.

Cheers,

Jesper
For one QA400 measures 20-20k. Jussi's measurements go all the way up to 70k.

Also if you look closer to the predominant harmonic: 2kHz, our measures are pretty close around -80db.

Digital filters also affect the result.

QAAnalyzer provides lots of ways to sample and present the data, so it's better to compare apples to apples with things all measured by QA400.
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Old 11th September 2015, 04:21 PM   #120
gentlevoice is offline gentlevoice  Denmark
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Signalyst DSC1
Hi,

Thanks once more for your feedback ...

Quote:
For one QA400 measures 20-20k. Jussi's measurements go all the way up to 70k.

Also if you look closer to the predominant harmonic: 2kHz, our measures are pretty close around -80db.

Digital filters also affect the result.
I recognize your comments so just briefly to clarify: My reference was only to your fig. 1 and Jussi's fig. 5 where the difference may be from 2H at 73 dB (your fig. 1) and Jussi's ~78 dBs. I also noticed there were more noise around the 1 kHz & 2 kHz 1H & 2H in your figure as well as an overall higher noise level.

Anyway, just an FYI comment of mine.

Have a good day :-)

Jesper
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