low voltage transmission, especially with a significant current, is not a trivial task ... it seems to me that the wire is too long for 1.2v, check that it reaches the consumer ..
Had some spare time. Made a couple of quick measurements of the dam..
This is still a dam1021 rev1 0.02% version with the vref mods.
In a cabinet with a rpi3b+ direct coupled (i2s) to it. Files used are made by REW, 24bit.
Some measurements with buffered outputs (rca)
1khz buffered
1khz unbuffered. (not able to reach 1dBFS here). A bit better
12khz tone. This is from rpi i2s coupled to the dam. Not much sign of jitter.
I got higher noisefloor with the xlr measurements because of different interface used....
Here is Sorens original measurement from his site.
Here is my take.
Looks similar?
BTW: Finally after almost 5 years I think (or was it 4?) it is in a box of its own.
Sincerely
This is still a dam1021 rev1 0.02% version with the vref mods.
In a cabinet with a rpi3b+ direct coupled (i2s) to it. Files used are made by REW, 24bit.
Some measurements with buffered outputs (rca)
1khz buffered
1khz unbuffered. (not able to reach 1dBFS here). A bit better
12khz tone. This is from rpi i2s coupled to the dam. Not much sign of jitter.
I got higher noisefloor with the xlr measurements because of different interface used....
Here is Sorens original measurement from his site.
Here is my take.
Looks similar?
BTW: Finally after almost 5 years I think (or was it 4?) it is in a box of its own.
Sincerely
Attachments
agree, same experience for v7 ( in comparison with v4)
1. i did not expect so many positive changes in sound from changing the board version
2. more transparency in sound, purity, clarity
3. sounds are more separated and layered
Soren, excellent progress!
ps.. I have been doing mods for many years, like many here, and so far there is an impression that no mods can achieve such progress
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Hello all,
I plan to begin my DAC build DAM1021 rev 7 and wanted to know what is the voltage that can be applied. I saw Soekris mention optimal is +/-9V.
Can I apply higher voltage, like say +/-12V? Also, what is the best input board to use with this DAC?
Please help me with these details as the thread is very long and may be these details are buried in there somewhere.
Thanks
Balaji
I plan to begin my DAC build DAM1021 rev 7 and wanted to know what is the voltage that can be applied. I saw Soekris mention optimal is +/-9V.
Can I apply higher voltage, like say +/-12V? Also, what is the best input board to use with this DAC?
Please help me with these details as the thread is very long and may be these details are buried in there somewhere.
Thanks
Balaji
Have you compared rev 7 to a rev 4/5 with capacitors added before and after the clock regulator? That's what made the biggest difference in my build (apart from stopping the clock adjustments).
Do you think you could give a link to the discussion where exactly to add those caps? (If there is such a discussion) thank you!
I would have to look through this thread just like you. It was in early 2021, I think.
EDIT: Here it is:
https://www.diyaudio.com/community/...-magnitude-24-bit-384-khz.259488/post-6794302
i do not have v5.
yes
| Power input | +-8-15V DC max 5W, Typ 2W |
jlsound board is nice. Lampizator uses in all DACs, including those for several tens of thousands of dollars..
yes, I did it a long time ago. but I won’t say that I noted a very positive thing from this mod.
Feature request, pretty please.... (1021, 1121)
- Use one of the free pins to stop the clock control - like after +++. To be connected to low (or high?) via a simple on/off switch.
By this, no "computer" and/or USB dongle is needed to stop the clock... just a breaking switch and a couple of wires...
Thanks! 🙂
//
- Use one of the free pins to stop the clock control - like after +++. To be connected to low (or high?) via a simple on/off switch.
By this, no "computer" and/or USB dongle is needed to stop the clock... just a breaking switch and a couple of wires...
Thanks! 🙂
//
Continuing a bit.
FW: 1.23 stock filter responses.
16/44.1 and 16/48
BTW: Noticed some more "jitter" spikes (12khz test) with FW:1.23 vs 1.21... (24bit) Not much though. Could be a measurement issue.
Just fyi, on the dam1021 rev7, the clock have it's own lp5907 regulator....
Hello . i have dam 1021 ver3. And have problem with locking. Usb interface is jlsound. When plaing on pc, by foobar for example. When i stop or pause music on more than 12 -15sekands and play again i can see that dams led is blinkig for some secands and music plays after 5 -7 sec. On coaxial it looks same. Try to changes firmware and filterd, even old 0.99. With no luck. I can say that sametimes it plays normaly,and dont unlock on stop or pause. Any idea what do do?
Hi,
I have finished the prototype of DAC based on Soekris 1021 rev.7
Sounds very good.
Starting to prepare final version.
I have finished the prototype of DAC based on Soekris 1021 rev.7
Sounds very good.
Starting to prepare final version.
Hi Gromushka,
It looks that you're using only a simple bridge with caps as power supply,
if you can miss a 1 voltage drop you can add a LDO regulator for a better power supply.
Example this LT1963 + LT3015
It looks that you're using only a simple bridge with caps as power supply,
if you can miss a 1 voltage drop you can add a LDO regulator for a better power supply.
Example this LT1963 + LT3015