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

[vdi_nenna]

Gents,

Thanks for the advise!

If shielding, would you ground the shield at any points?

Thanks,

Vince

 

[rickmcinnis]

I think (going from memory) that SDTrans had a separate ground for each I2S lead - I think the DAC board only had one so I connected all of the grounds with a plenum wire and then connected this to the ground point. Or it was the other way around - you get the idea!

 

[danny_66]

For I2S I used a cat5 cable,
each twisted pair was used for a I2S lead together with ground,
so each i2s wire is twisted with ground.

 

[henrylarsen]

I think (going from memory) that SDTrans had a separate ground for each I2S lead - I think the DAC board only had one so I connected all of the grounds with a plenum wire and then connected this to the ground point. Or it was the other way around - you get the idea!

There is an iso ground across each of the connections at the board, so it is easy to use the twisted pears in a cat 5 or a cat 6 cable, one as the hot wire and one as the ground.

 

[vdi_nenna]

Since I have a 1000 ft spool of cat6, I'll probably go with some if it. 😀

Thx,

V.

 

[AlanElsdon]

I have moved the Raspberry Pi to be next to the Isolated I2S inputs and used very short wires (4 - 5 cm) between the boards; the clicks remain.
One thing which I noticed was that the noises seem louder on the SE outputs which go to a preamp / power amp as opposed to the Balanced outputs which go to my Stax headphones.
I am not sure if that is significant or not; I will load firmware 1.06 and recheck noises.

 

[AlanElsdon]

Reverted to 1.06 and all noises have gone.

 

[soekris]

Seems to be an issue with the new firmware, probably sample skipping/adding when crossing clock domains, I'll will work to find and fix it.

 

[TNT]

These events would be nice to output on the serial.

 

[rickmcinnis]

There is an iso ground across each of the connections at the board, so it is easy to use the twisted pears in a cat 5 or a cat 6 cable, one as the hot wire and one as the ground.

i bypassed the isolators - should have mentioned that. No need for them with the Sd player.

 

[jnldaddy]

I have been following the excellent write up at Soekris dam 1021 R-2R DAC ILLUSTRATED GUIDE | H i F i D U I N O.

I am using the diyinhk regulated power supply pictured in the blog. As pictured, it’s got two 12VDC outputs, but the diagrams only show hookups for a supply with one 12VDC output. Then again, image searches seem to show both being used.

Do I connect only one of the 12VDC outputs to the Soekris? Or both, and if so, how?

Thanks in advance for any advice!

 

[sbobba]

What has changed for Vref with hardware modifications on the DAM1021 board V5?

 

[ristar]

Hi Soren,

I accidentally yanked the cable too hard while trying to update the firmware and now the i2s inputs aren't detecting for one of my boards... can you let me know if there is an alternative point to solder the i2s inputs to?

Best,

 

[ristar]

Hi Soren,

I accidentally yanked the cable too hard while trying to update the firmware and now the i2s inputs aren't detecting for one of my boards... can you let me know if there is an alternative point to solder the i2s inputs to?

Best,

Ok I managed to find bclk and data but having trouble finding the leg on the isolator for lrclk.

 

[TNT]

Lers get the 1121 FW out the door before summer? 🙂

//

 

[derekr]

Lers get the 1121 FW out the door before summer? 🙂

//

Summer this year, please..... 🙂)

 

[wineds]

Ok I managed to find bclk and data but having trouble finding the leg on the isolator for lrclk.

Not sure which version you have but there was a jpg posted earlier in this thread showing all the tracks. Filename was dam_two_side.jpg

 

[living sounds]

Soeren, when will the dam1021-12 be availible again in Europe?

Also, what is the latency (from S/PDIF input to analog output) using different filters? I couldn't find figures anywhere.

Finally, are you still planning to offer an ADC (as discussed earlier, using a discrete front end and a medical SAR chip) in the foreseeable future?

Thanks!

 

[Rajapruk]

I am interested in this dac. I have questions, probably already answered, but there are 740 pages to read!

I have 4-way active DIY-speakers.

1. Can several boards be synchronized (clocks), to be used in active multi-way speaker? And not getting out of synch after a while?

2. Anyone using the dac as crossover-filter successfully?

3. Can volume-control be controlled toghter for several boards? Can 0dB be set as the max gain? (I do not want positive digital gain by mistake)

4. Examples of builds with multiple boards in the same chassis would be nice to see. Can boards share power-supply?

5. No pops/dc-output on startup or shutdown with recent boards?

6. Link to independent measurements?

7. Pops/clicks on sample rate changes?

8. Is the noise-floor ”state-of-the-art” with this chip? I want low noisefloor.

I will probably have more questions later on. I am tempted to build a 8-channel dac with this chip.

 

[banzas]

Hi Soren,
Dam 12 is out of stock at several days, when do you expect have a new batch ready to go?
Thanks in advance!