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

ericuco 27th October 2014 04:11 PM

Quote:

Originally Posted by mcluxun (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4099973.html#post4099973)
single ended

According to Jussi, a new version (DSC2) is in the works with balanced output which would better for me. :D

mcluxun 27th October 2014 05:32 PM

Quote:

Originally Posted by ericuco (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4102530.html#post4102530)
According to Jussi, a new version (DSC2) is in the works with balanced output which would better for me. :D

I would love to see a DSC2 design.
But before that I need to finish my DSC1.

As far as SE/Bal concerns there are lots of solutions out there to transform from one to another.

To me, a pair of transformers can get this job done nice and easy.

ericuco 27th October 2014 07:57 PM

Quote:

Originally Posted by mcluxun (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4102607.html#post4102607)
But before that I need to finish my DSC1.

I trust that you will keep updating this thread as your DSC1 progresses as I am very interested in your efforts!! I know that several people over on the Computer Audiophile forum would be interested as well given that HQ Player has gained in popularity over the past few months.

Signalyst 29th October 2014 09:28 AM

List of fixes I have made (I'll update the documents when I have time):
1) Either change I/V feedback resistor R1/R2 to 1 kOhm (this is what I did), or drop resistance of the network (8k network would be optimal).
2) IC11/IC12 non-inverting input pin 3 should be the point where DGND and AGND are connected, I added jump wires to the pin. While doing this I cut the AGND-DGND R18 (bead) connection on PSU board.
3) IC11/IC12 output pin 6 should be connected to AGND with 100k resistor, I connected from C520/C530 input side.

mcluxun 2nd November 2014 03:22 AM

Got mine running with xmos.
https://farm6.staticflickr.com/5609/...c88a8636_z.jpgDSC01277 by , on Flickr
https://farm4.staticflickr.com/3950/...603f1b15_z.jpgDSC01272 by , on Flickr
where i2s to dsd matches as:
xmos DSC1
DATA DSDR (pin3)
SCLK BCLK (pin4)
LRCK DSDL (pin5)
3.3v DSDEN (pin7)
https://farm8.staticflickr.com/7532/...699fcfdf_z.jpgDSC01273 by , on Flickr
My xmos is running with old firmware which goes up to 3072000Hz and DoP only on HQplayer.
under uint8 mode HQ doesnt allow me to select sample rate.
(Jussi what's your setup with amanero on HQ? and ever try to run it with XMOS?)
In that case the noise is way too loud to enjoy music.
It's a problem related to the rate because I can clearly hear differences between 2822400 (dsd64) and 3072000.

Only thing i can tell right now is the music is flowing very well, definitely different from anything Ive heard.

And strangely this thing can sing with out power ??????

Signalyst 2nd November 2014 09:40 AM

Quote:

Originally Posted by mcluxun (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4108450.html#post4108450)
under uint8 mode HQ doesnt allow me to select sample rate.

uint8 mode is just for custom special hardware that supports 8-bit "PCM" at 1/8th DSD rate. So it shouldn't be used. Either DoP or ASIO DSD (subject to driver support). For ASIO DSD, set SDM Pack to "none" and the driver support will be auto-detected.

Quote:

(Jussi what's your setup with amanero on HQ? and ever try to run it with XMOS?)
I'm using ASIO driver in native DSD mode (SDMPack=none) and DSD5v3 or DSD7 modulator (DSD5v3 modulator will appear in HQP 3.5.0). Filter is poly-sinc-short-mp-2s. Also DoP at 6.1 MHz works.

I didn't try XMOS yet, I'll try to get some board for the purpose and try it out.

Quote:

In that case the noise is way too loud to enjoy music.
It's a problem related to the rate because I can clearly hear differences between 2822400 (dsd64) and 3072000.
I tried also DSD64 and didn't encounter any significant noise problems, although the Sallen-Key filter's fc is too high for it and it will also have some roll-off already at 20 kHz because fc of the conversion stage scales linearly with sampling rate. Taking the last 8-bit shift register out and changing cut-off of the Sallen-Key would improve DSD64, but of course with a trade-off in performance.

Quote:

And strangely this thing can sing with out power ??????
Without PSU? IIRC, there shouldn't be output without power to the output mute relay. And of course none of the active parts would operate correctly.

The mute actually performs really nice with Amanero, so I don't get any extra noises.

Here's picture how I implemented the fixes. Notice short wires for the I/V pin 3, I just removed a bit of solder stop mask from the DGND ground plane and used short L-wires from the pin to the nearest DGND plane point.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

Signalyst 2nd November 2014 09:52 AM

Quote:

Originally Posted by mcluxun (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4108450.html#post4108450)
xmos DSC1
DATA DSDR (pin3)
SCLK BCLK (pin4)
LRCK DSDL (pin5)
3.3v DSDEN (pin7)

I note one criticial thing missing here and in your pictures. You need to feed 3.3V supply to the Amanero interface pin 10 (top row, left-most pin). You can take this from the DSC1PSU 3V3 which is unused at the moment with Amanero board (since Amanero's feed is used). This power is needed to run the IC1 and IC2.


For the SJ1 jumper, I have the top part connected (middle and upper pads).

LeonBernieniv 2nd November 2014 01:54 PM

Jussi, if AGND is pin3 of ad844, so where is DGND point? My chose is the GND closed Amanero, which is after the decouling of psu.

mcluxun 2nd November 2014 04:11 PM

Quote:

Originally Posted by LeonBernieniv (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4108768.html#post4108768)
Jussi, if AGND is pin3 of ad844, so where is DGND point? My chose is the GND closed Amanero, which is after the decouling of psu.

If I understand it correctly it's where those two GNDs merge.

mcluxun 2nd November 2014 08:22 PM

Quote:

Originally Posted by Signalyst (https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-post4108591.html#post4108591)
uint8 mode is just for custom special hardware that supports 8-bit "PCM" at 1/8th DSD rate. So it shouldn't be used. Either DoP or ASIO DSD (subject to driver support). For ASIO DSD, set SDM Pack to "none" and the driver support will be auto-detected.



I'm using ASIO driver in native DSD mode (SDMPack=none) and DSD5v3 or DSD7 modulator (DSD5v3 modulator will appear in HQP 3.5.0). Filter is poly-sinc-short-mp-2s. Also DoP at 6.1 MHz works.

I didn't try XMOS yet, I'll try to get some board for the purpose and try it out.



I tried also DSD64 and didn't encounter any significant noise problems, although the Sallen-Key filter's fc is too high for it and it will also have some roll-off already at 20 kHz because fc of the conversion stage scales linearly with sampling rate. Taking the last 8-bit shift register out and changing cut-off of the Sallen-Key would improve DSD64, but of course with a trade-off in performance.



Without PSU? IIRC, there shouldn't be output without power to the output mute relay. And of course none of the active parts would operate correctly.

The mute actually performs really nice with Amanero, so I don't get any extra noises.

Here's picture how I implemented the fixes. Notice short wires for the I/V pin 3, I just removed a bit of solder stop mask from the DGND ground plane and used short L-wires from the pin to the nearest DGND plane point.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

Just confirmed that my xmos is running older version of firmware and can not go beyond dsd64, I had to try higher rate with amanero.
As far as the pin connection goes. Do I need 3.3v on other pins: 7, 10 and 11.
And for SCJ1 I should short 1 and 2?


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