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

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#2,664
J.Exbrayat said:
Hi,

I received my DAM card. It looks great.
I would like to use it with Raspberry V2 & VolumIO with direct I2S connection.

Anyone tried this ? Where can I find a good tutorial ?
The mains items :
- Which I2S driver to use in VolumIO ?
- Does the driver permit to us to manage the DAM volume capapability from VolumIO client ?
Click to expand...

Hi,

apparently this can be done, still requires some changes in the volumio settings (editing files, etc). I tried it yesterday, and wasn't very succesful. I eventually did as Hannesie, and installed the PiCorePlayer. From first accessing the website to download it until music came through was no more than 15 or 20 minutes!

Regards,
Erik
 
#2,667
Hi,

I´ve another little problem with the dam1021. I´ve connected via SPDIF a CD-Player and via Toslink a set-top-box. Both devices are active. The dam1021 input channel is on SPDIF. The problem is, that there are permanent clicks on the analog output. When I remove the TOSLINK cable, the clicks ends immediately. Is this a known issue. Are there solutions for this problem? I use the TOSLINK-module from Twistedpearaudio.

Thanks in advance for your help 🙂

Christian
 
#2,670
Hi,

I believe that this part is ok! Every input (I2S, TOSLINK, SPDIF) solo functions perfect.

I haven´t had the problem, before I built up a Arduino appliance to control the RS232-Port of the dam1021. Now I can switch the inputs and the volume with an ir-remote and see the results at an LCD-display. Before I had to plug every input solo mechanically and now I´m a little bit bugged, I have a perfect solution to control the dac, but (with TOSLINK plugged) the clicking in the SPDIF-section.
 
#2,671
mc002 said:
When I remove the TOSLINK cable, the clicks ends immediately. Is this a known issue.
Click to expand...

No issue here. I have I2S (with Amanero) and TOSLINK hooked up and use remote to trigger input changes via RS232. I haven't had clicking that requires unplugging any input to fix.

You might potentially have issues if you have the input set to Auto//I3 as the DAM will scan all inputs so if your source stops sending a clock the DAM might be hunting for other inputs.

Selecting the specific input avoids this:
I0 = I2S
I1 = SPDIF
I2 = TOSLINK
 
#2,672
Thanks for your answer! I switch the inputs via RS232 too. In the meantime I believe, that a I have grounding issue.

Do you have informations, whether the dam1021 could handle 48fs?

p.s.: I would like to say here, that I follow your "Filter Brewing Thread" with fascination. I have learnt so much in reading your posts. Thank you! Christian
 
#2,673
mc002 said:
little correction! 🙂

Hello,

I´ve a problem with connecting a Philips CD Pro2 module to the dam1021 via I2S. Does the dam1021 support 48fs?

Thanks in advance for your help!
Click to expand...

The dam1021 don't use any master clock, it just need bitclock, wordclock and data. If you have real I2S output, it should just work if connected correctly.

I´ve another little problem with the dam1021. I´ve connected via SPDIF a CD-Player and via Toslink a set-top-box. Both devices are active. The dam1021 input channel is on SPDIF. The problem is, that there are permanent clicks on the analog output. When I remove the TOSLINK cable, the clicks ends immediately. Is this a known issue. Are there solutions for this problem? I use the TOSLINK-module from Twistedpearaudio.
Click to expand...

I did observe a little interference at some point, you need to ensure you have good grounding and keep the signal shielded and separate, they are sensitive high speed signals....
 
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#2,675
soekris said:
The dam1021 don't use any master clock, it just need bitclock, wordclock and data. If you have real I2S output, it should just work if connected correctly.

I did observe a little interference at some point, you need to ensure you have good grounding and keep the signal shielded and separate, they are sensitive high speed signals....
Click to expand...

Hi Søren,

I think that it still is a valid question what BCK to fs ratios are supported by R2RDAC. I have encountered a situation where for ratio of 32 and 16bits, the DAC does not sync to the signal. I have documented this with a logic analyser on the I2S interface between Raspberry Pi running Volumio 1.5. See enclosed pdf for details.
 

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#2,676
mabur said:
Hi Søren,

I think that it still is a valid question what BCK to fs ratios are supported by R2RDAC. I have encountered a situation where for ratio of 32 and 16bits, the DAC does not sync to the signal. I have documented this with a logic analyser on the I2S interface between Raspberry Pi running Volumio 1.5. See enclosed pdf for details.
Click to expand...

The dam1021 assume 32 bits per word, that's what spdif and all newer I2S interfaces use, meaning bitclk must be 64 times the sample rate. The dam1021 use the bitclk for detecting incoming sample rates.

It's correct that I2S don't specify bits per word, and some older devices might be less than 32 bits, those are not supported by the dam1021.
 
#2,677
spzzzzkt said:
There are headers for the I2S, AES/EBU, RCA, TOSLINK inputs. You need to provide the hardware for the inputs you require.

- USB -> I2S board (for example Luckit, Amanero, DIYINHK, etc, etc, etc)
- AES/EBU: XLR socket + pulse transformer + resistor
- RCA SPDIF: RCA + pulse transformer + resistor
- TOSLINK: Toslink Receiver + 3.3VDC supply, capacitor and inductor.

TOSLINK is the only input that requires a power supply - not sure if the DAM1021 board provides a place to tap 3,3V for this purpose?

Most DIY USB->I2S interfaces use USB power.

You should be able to build the AES/EBU, RCA and TOSLINK inputs on proto board to get up and running as they are pretty minimal.
Click to expand...

How can I connect AES source to SPDIF2?

I try to use DA101C transformer and 110R pair at its secondary, it does not works. Signal cannot be locked.
 
#2,678
my
 

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#2,679
The above picture was upload by Kiven and also share the broad for us . First and second picture from left was the completed installed the Amanero Combo with R2R DAM Dac there are serveral on broad led to indicate the real time sampling rate. The rest of picture just a comparison of the different version of the main broad
 
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