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-   -   Signalyst DSC1 (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1.html)

cu6apum 10th March 2020 06:57 PM

Quote:

Originally Posted by luchoh (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post5411287.html#post5411287)
8. The important file is amanero_mute_pins

It takes a bit mask, so for D5 on Cronus, do this:
....
One can test this experimentally - when not playing, you should have HIGH on the said pin and when playing - LOW.
....

Let me know.


Hiyas!
I feel a bit scrambled with mute_pins and amanero_mute_pins - what's the difference?

The task I'm trying to complete is slightly aside of this topic - it's 8-channel AKM dac, so, except of getting the mute pin out of data pin array (I emailed you already about this) I need actually 2 outputs - reset (when Fs changes) and actual mute.

What are the roles of 2 mute outputs?

Thank you.

bs 18th March 2020 01:07 AM

1 Attachment(s)
Parts are starting to arrive for some experimentation.. :)

Solder mask for DSC2.5.2
Vishay TNPW12064K99BEEN (4.99K, 0.1%, 25ppm) x900, at what appears a good bargain online at 3.7c each.

Hopefully the PCBs will arrive soon!

bs 18th March 2020 01:12 AM

Quote:

Originally Posted by bs (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post6115904.html#post6115904)
Way back at post 563 there was a discussion about logic distortion starting at around 1mA.

I assume this 1mA relates to the nominal current through each resistor.
I see the current recommended resistors are 4k7-6k4 range, hence I assume set to be just under or on this point.

Has further analysis been done to qualify this, does anybody have any measurements they have saved?
Is the cause of the distortion yet understood?

Many thanks
bs

My immediate thought jumped to the suggestion that distortion arises from driving into ground, not a virtual ground, however I assume this would be fairly linear and not begin to occur at a point.
I also wonder is this still a consideration with the later differential design?

gionag 18th March 2020 01:22 AM

Quote:

Originally Posted by bs (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post6124792.html#post6124792)
...
Vishay TNPW12064K99BEEN (4.99K, 0.1%, 25ppm) x900, at what appears a good bargain online at 3.7c each.
...

Seems some generic high-reliability resistor...
i guess here you have to spend some more money to gather better performance... you need to aim for high impulse current handling and lower noise.

Vishays PAT are a good choice, as for some type of MELF.
anyway, any tantalum-nitride thin film resistor will be up to the task.

bs 18th March 2020 02:06 AM

Quote:

Originally Posted by gionag (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post6124802.html#post6124802)
Seems some generic high-reliability resistor...
i guess here you have to spend some more money to gather better performance... you need to aim for high impulse current handling and lower noise.

Vishays PAT are a good choice, as for some type of MELF.
anyway, any tantalum-nitride thin film resistor will be up to the task.

Hi gionag, many thanks for your feedback on resistor choice.

Yes exactly. This is not my first choice of resistor, only something I felt practical to begin experimentation with at low cost as I plan to try a few iterations of changes. I intend to initially focus efforts elsewhere, not on resistor make/series choice first.

Saying that, I thought these looked ok!
- Thin film
- Same 25ppm TCR as the best available in Vishay PAT or Vishay MELF 0204.
- Same 0.05uV/V Current noise as the Vishay MELF 0204 (not sure of PAT current noise)
- 0.1% (although this doesnt matter)
- Not sure of Voltage coefficient though.

With PAT 4.99K about US$0.59each/100-$0.51/500 from Mouser, and low TCR MELFS even more, at about 1/16th the cost I thought these were ok budget choice!
If you see a specific problem with them then please let me know!

gionag 18th March 2020 06:41 PM

Quote:

Originally Posted by bs (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post6124817.html#post6124817)
Hi gionag, many thanks for your feedback on resistor choice.

Yes exactly. This is not my first choice of resistor, only something I felt practical to begin experimentation with at low cost as I plan to try a few iterations of changes. I intend to initially focus efforts elsewhere, not on resistor make/series choice first.

Saying that, I thought these looked ok!
- Thin film
- Same 25ppm TCR as the best available in Vishay PAT or Vishay MELF 0204.
- Same 0.05uV/V Current noise as the Vishay MELF 0204 (not sure of PAT current noise)
- 0.1% (although this doesnt matter)
- Not sure of Voltage coefficient though.

With PAT 4.99K about US$0.59each/100-$0.51/500 from Mouser, and low TCR MELFS even more, at about 1/16th the cost I thought these were ok budget choice!
If you see a specific problem with them then please let me know!

you can try whatever you feel... is the whole point of DIY.
i was just suggesting what is considered a "proved" solution to get good/best result from the get go.

at any rate... report back what you find out !

:)

Jjazz 31st March 2020 07:29 AM

Hi!

it is possible to connect Ian Canada fifopi to dsc2.5.2. this involves using Naa from rapsBerry pi.

In this case, it is necessary to make modifications in Naa as it happens with BBB. Would they be the same modifications?

Thanks!

Zoran 2nd April 2020 07:22 PM

Quote:

Originally Posted by bs (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post6124795.html#post6124795)
My immediate thought jumped to the suggestion that distortion arises from driving into ground, not a virtual ground, however I assume this would be fairly linear and not begin to occur at a point.
I also wonder is this still a consideration with the later differential design?

I asked couple of times what value for end resistors suite best, for 3.3V and for 5V logic. But without answer. :(
Thanks for point the post where this issue discussed :)
cheers
.

Jjazz 27th April 2020 03:49 PM

Hello, I have a problem with DSC2 5.2. : The right channel is heard with much less volume than the left one. I have noticed that U21 is very hot, I do not know if it has anything to do, I have also been able to measure that in right channel there is continuity between gnd and +.

Any idea of the problem?

Thanks

ppy 27th April 2020 05:05 PM

You need to replace U21 - 74LVC2G86


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