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

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C

Curious Fitz

Member
Joined 2016
Well: the sound is excellent - great separation and clarity.

I'm using the RAW outputs currently.

Bit thin and harsh top-end perhaps: could be a bit warmer, but, I'm hoping a tube buffer may help here: http://item.taobao.com/item.htm?id=40805026861

Being very much a 'noob' - there has been a lot of grinning going on by me since getting such a lovely sound out of this. I'd like to thank everyone in the forum for their help :)

I have seen quite a bit about power supplies: I'm using a regulated +-12v supply: http://item.taobao.com/item.htm?id=19445285988

What is the current view on using battery (say 2 x 10aa(a) NiMH packs) power?

Many thanks again forum: like most of you I am sure here on a DIY forum, I am extremely happy with my work but now want to improve it - hee hee.
 
U

ulf_audio

Member
Joined 2004
DAC stopped working - any help??

Hi, my DAC stopped working about 2 weeks ago. It has been in use close to 2 years and always with the power switched on. I have a Rev.01 board with the Vref mods and a few other mods as well. I had some sync problems and thought that a newer version of the firmware might help. I tried acessing the Umanager but that did not work so I reflashed the ST-chip with the bin file found on Puls site. Still no response from the uManager. The sync led is constantly flashing. Where I live we had a mains power failure a couple of weeks ago, and since the DAC is always powered I think that this may be cause. All the board voltages measure as they should.

So, should I just buy a new board or is there a way I can get it to work again??
 
S

soekris

Member
Joined 2009
soekris.dk
Paid Member
ulf_audio said:
Hi, my DAC stopped working about 2 weeks ago. It has been in use close to 2 years and always with the power switched on. I have a Rev.01 board with the Vref mods and a few other mods as well. I had some sync problems and thought that a newer version of the firmware might help. I tried acessing the Umanager but that did not work so I reflashed the ST-chip with the bin file found on Puls site. Still no response from the uManager. The sync led is constantly flashing. Where I live we had a mains power failure a couple of weeks ago, and since the DAC is always powered I think that this may be cause. All the board voltages measure as they should.

So, should I just buy a new board or is there a way I can get it to work again??
Click to expand...

The LED blinks so there are life in the dam1021.... Anything can be dead, so you need to do standard debugging, checking everything, especially the serial interface as you first need to get in contact with uManager.
 
A

audiozen

Member
Joined 2017
Curious Fitz said:
Well: the sound is excellent - great separation and clarity.

I'm using the RAW outputs currently.

Bit thin and harsh top-end perhaps: could be a bit warmer, but, I'm hoping a tube buffer may help here: http://item.taobao.com/item.htm?id=40805026861

Being very much a 'noob' - there has been a lot of grinning going on by me since getting such a lovely sound out of this. I'd like to thank everyone in the forum for their help :)

I have seen quite a bit about power supplies: I'm using a regulated +-12v supply: http://item.taobao.com/item.htm?id=19445285988

What is the current view on using battery (say 2 x 10aa(a) NiMH packs) power?

Many thanks again forum: like most of you I am sure here on a DIY forum, I am extremely happy with my work but now want to improve it - hee hee.
Click to expand...

A neat operating platform! It looks like you can easily buy things from taobao.com,Do you buy through agent?
 
C

Curious Fitz

Member
Joined 2016
audiozen said:
A neat operating platform! It looks like you can easily buy things from taobao.com,Do you buy through agent?
Click to expand...

Thank you audiozen - I'm new to all of this so I appreciate the comment...

Yes - I've tried https://www.taobaoring.com/ and https://www.bhiner.com/ - both seem OK, but, I've had a few damaged goods and DOA items arrive - you get cheaper goods but pay for it somewhat in other ways (such as exorbitant delivery charges for anything over 500g).

I'm thinking of separating the transformer and regulator into one metal case and supplying DC to the Soekris DAM & S/PDIF -> I2S housed in another metal case: would a couple of 4700uF 25v capacitors be a good idea inside the box with the Soekris DAM & S/PDIF -> I2S boards to smooth the DC a little more, or, am I just wasting time and money...?

I did read a bit more about battery power, but I also read a few people mentioning that when the batteries were powered, they then noticed no difference to when turning the power supply off. Of course the batteries themselves could have been filtering the supply I guess...

Regarding the tube buffer - has any one got any ideas about a suitable relay to use or rotary switch to send the signal out raw or via the tube buffer?

Many thanks Forum :)
 
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P

Philipp23

Member
Joined 2008
Hello dear dam users

I have a brand new DAM1021 with serial number 338. Does this already have the Vref mod from the factory?

I'm also thinking to add capacitors to the shift registers like it was done in the hifiduino blog, but a lot of the vias are filled with the green solder resist varnish. Any idea how to remove it?

I have a DAM1021 manual from September 2015. Is this the latest version of the manual? In this manual you can find a picture from the Power Connector J1 which shows two rectifiers after the power input connector. When I check my DAM1021 I only see one bridge rectifier. Is this an error in manual or did I overlook or misunderstand something?

Kind Regards

Phil
 
U

ulf_audio

Member
Joined 2004
DAC Alive again!!

Got a new USB-RS232 cable - no change. Did some mindless tinkering on the board, brushed, pointed and blowed. I Couldn't see anythig wrong and all the voltages were as they were supposed to be. Connected it again and got the uManager working. So, now it's up and running again. Probably just needed some attention.

Ulf
 
A

audiozen

Member
Joined 2017
Curious Fitz said:
Thank you audiozen - I'm new to all of this so I appreciate the comment...

Yes - I've tried https://www.taobaoring.com/ and https://www.bhiner.com/ - both seem OK, but, I've had a few damaged goods and DOA items arrive - you get cheaper goods but pay for it somewhat in other ways (such as exorbitant delivery charges for anything over 500g).

I'm thinking of separating the transformer and regulator into one metal case and supplying DC to the Soekris DAM & S/PDIF -> I2S housed in another metal case: would a couple of 4700uF 25v capacitors be a good idea inside the box with the Soekris DAM & S/PDIF -> I2S boards to smooth the DC a little more, or, am I just wasting time and money...?

I did read a bit more about battery power, but I also read a few people mentioning that when the batteries were powered, they then noticed no difference to when turning the power supply off. Of course the batteries themselves could have been filtering the supply I guess...

Regarding the tube buffer - has any one got any ideas about a suitable relay to use or rotary switch to send the signal out raw or via the tube buffer?

Many thanks Forum :)
Click to expand...

I see, Thanks!
 
C

Curious Fitz

Member
Joined 2016
soekris said:
Current dam1021 do not need any mods or upgrades for great sound. Of course, some want to go all in with battery vref supplies, or large caps, or fancy power supplies....
Click to expand...

Noted ;) thanks soekris

The sound is a bit harsh top end though (mine from the RAW outputs) - I have this tube buffer in mind: http://item.taobao.com/item.htm?id=40805026861

Do you have any tips/tricks for me regarding this please (whether you've a better option for this etc.)

Thanks for deigning a great board and making it available to the Public :)
 
G

gapson

Member
Joined 2015
soekris said:
And just before someone is bitching that I'm becoming too commercial and abandoning the DIY after using all the feedback.

I'm going to continue supporting DIY, the Raspberry Pi version will launch latter, and sometime down the road there will come a dam1021 successor....
Click to expand...



Hi Soeren,

Sound like I shall wait for the successor for dam1021, would it be in production within 2017?

Besides, like the dac1101, when would the special price end? I am seeking my dad to accept it as a better option than the delta sigma dac he has on hand...

Would there be any discount for the dac1541? Cheers
 
Last edited:
S

soekris

Member
Joined 2009
soekris.dk
Paid Member
Curious Fitz said:
Noted ;) thanks soekris

The sound is a bit harsh top end though (mine from the RAW outputs) - I have this tube buffer in mind: http://item.taobao.com/item.htm?id=40805026861

Do you have any tips/tricks for me regarding this please (whether you've a better option for this etc.)

Thanks for deigning a great board and making it available to the Public :)
Click to expand...

The dam1021 using the raw output should not be harsh, you should look at what's after it....

I'm not familiar with any tube buffer, but a lot of people like them....
 
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