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

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#10,826
Changed PSU module. new trasnsformer for 12V dual out 250mA 6VA.
Created stable line out using dual channel LM317T and put 3300mF to each channel as main capacitors plus 47mF on out after stabilization.
I hope this is enough for stable power +/-12V.
Schematics and look attached.
 

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#10,829
One question, may I have missing something in 1021 instructions.
I found how to set filter and how to change input using UART connection and have a plan to add arduino support for do it remotely.
But also I want to put small monitor to display info about filter input and stream type as PCM, DSD with bitrate information.
That is a problem I haven't see how I can see current settings and get stream info.
I have seen some setup with support this feature but it was some ready to use module, so may here I could be instructed or found some link to full info how to do this feature?
 
#10,832
Gromushka said:
One question, may I have missing something in 1021 instructions.
I found how to set filter and how to change input using UART connection and have a plan to add arduino support for do it remotely.
But also I want to put small monitor to display info about filter input and stream type as PCM, DSD with bitrate information.
That is a problem I haven't see how I can see current settings and get stream info.
I have seen some setup with support this feature but it was some ready to use module, so may here I could be instructed or found some link to full info how to do this feature?
Click to expand...

I'm using this one (lite version): https://www.diyaudio.com/community/...kits-for-soekris-dam1021-1121-control.307452/
 
#10,833
Gromushka said:
I plan to use dual LM317 because I have dual transformer output 8V and than reverse one output by using single central ground by connecting + from first and minus from second output. That's all.
Click to expand...

Sound great, there's not much point in going higher-end than this. Everything goes through a LM317/LM337 pre-regulator on the board before going to the all-important Vref supply. So unless you want to extensively modify your board, then this is more than sufficient.

What's the USB board you are using?
 
#10,834
I have been using USB PLAYER PRO for a long time and recently I pair it with TIDAL, with a self-built DAC based on a Soekris DAM1021 rev.5 module and JLSound I2SoverUSB v.III USB connector and LEEco XL2 smartphone. So far so good, then I bought the latest version 7 of the DAM1021, replacing it with the one above and a frequent inconvenience is happening to me. I would like to point out that with the DAM1021 I get the listening volume with a potentiometer that acts digitally on the DAM1021, but when I now try to increase it, the USB Player pro stops and the sound comes out only from the Android smartphone, with the only wording occasionally, however, the server times out. What to do? Thanks.
 
#10,835
I have a little bit confuser now. I have bought STLab USB 2 RS32 adapter for PC.
But now I have found the PC RS232 usual voltage levels are ±13V but in rev7 board used TTL in/out with ±3.3V levels.
I don't have J10 connection but different set with 3 pins connector could be found with RX,TX and GND pins.

As I read - TTL connection are part of J3 connector. No info about those new 3 pins found.
Could someone here has experience with rev7 RS23? How it could be used? Which levels are implemented?
Thanks.
 
#10,838
Gromushka said:
I have a little bit confuser now. I have bought STLab USB 2 RS32 adapter for PC.
But now I have found the PC RS232 usual voltage levels are ±13V but in rev7 board used TTL in/out with ±3.3V levels.
I don't have J10 connection but different set with 3 pins connector could be found with RX,TX and GND pins.

As I read - TTL connection are part of J3 connector. No info about those new 3 pins found.
Could someone here has experience with rev7 RS23? How it could be used? Which levels are implemented?
Thanks.
Click to expand...
J10 is labeled GND,TXD,RXD and is TTL now.
Here is example interface https://www.adafruit.com/product/954 but any TTL level interface should work.
 
#10,839
sbobba said:
I have been using USB PLAYER PRO for a long time and recently I pair it with TIDAL, with a self-built DAC based on a Soekris DAM1021 rev.5 module and JLSound I2SoverUSB v.III USB connector and LEEco XL2 smartphone. So far so good, then I bought the latest version 7 of the DAM1021, replacing it with the one above and a frequent inconvenience is happening to me. I would like to point out that with the DAM1021 I get the listening volume with a potentiometer that acts digitally on the DAM1021, but when I now try to increase it, the USB Player pro stops and the sound comes out only from the Android smartphone, with the only wording occasionally, however, the server times out. What to do? Thanks.
Click to expand...
At least me and @PavZ experienced problem with pot volume control see post . It seems it's not working as reliable as in rev 5.
 
#10,840
gumisb said:
J10 is labeled GND,TXD,RXD and is TTL now.
Click to expand...
I have YO-02 USB to TTL adapter
I hav conncected tx to rx and rx to tx with ground.
During power up I see output correctly from DAM 1021
R1.24 r1.24
I3
L000
F5
PN
V+00
I3


But nothing could b sent to device.
I previously seen here some same issue with J10 but on other revision.
About rev7 nothing.

Soren isn't commented this issue.

So do someone have rev7 with USB to TTL issue fixed?
 
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