Soekris' DAC implementations

[Julf]

You mean also two pairs (and more) together ?

Pairwise (so that the noise gets balanced out).

 

[RollE2k]

You mean also two pairs (and more) together ? (I don't ask for how it's look but really if it makes a difference in a Pre or a DAC if you have several secondaries from several traffos...)

No, just individual pairs.. i didn't notice he did it with both pairs together.. that shouldn't have any effect to my knowledge

 

[Julf]

No, just individual pairs.. i didn't notice he did it with both pairs together.. that shouldn't have any effect to my knowledge

Indeed. Basically you want twisted pairs.

 

[Eldam]

Thanks !

(I'm breathing, cause if you look at the photograph I linked : there is also a 5 traffo not in he photograph ! It would have been a little complicated to twist all together ! )

 

[Julf]

(I'm breathing, cause if you look at the photograph I linked : there is also a 5 traffo not in he photograph ! It would have been a little complicated to twist all together ! )

You would have had to find someone who is really good at braiding

 

[Eldam]

rastafari...

 

[SebastianL]

If you aint using the buffered/balanced outputs then why not feed the board directly with +-5v on the secondary side of the 5v regs... lt3032 should be better than the on board 5v regs... altough i havent checked for the obvious place to connect the power input - but there is probably a few people here that have made that mod..

Thanks, I'll look into that.

 

[vdi_nenna]

Does anyone know if the 1021 Rev2 boards need any mods, like the Rev1 board did with the vref mods?

Thanks,

Vince

 

[Curious Fitz]

Advice for power supply requirements please

Although I'm slightly embarrassed to ask the Forum - please could you advise as to whther, if using +12V 0V -12V DC power supply to the Soekris DAM 1021 board, should I connect it as I have drawn on the reference manual page?

I've just received my board and don'twant to make a stupid mistake and watch smoke curl into the air above it.......!

Thank you Forum

 

[Curious Fitz]

I'm thinking of using the following transformer: 30VA & voltage regulator board to feed the Soekris DAM with the +12V 0 -12V DC supply.

Any comments would be valued - thanks again everyone

 

[Curious Fitz]

and this board (powered from the 9V ac output of the above transformer) to provide the i2s input to the Soekris DAM from an optical/coaxial S/PDIF input.

I'm just figuring out how I'm going to provide the 3.3V dc that I have read that the i2s input requires though!

Again, thank you everyone for any comments/feedback you could give me

 

[quantran]

Hi

Sorry for my ignorance. Is this a voltage output DAC or is it a current output DAC with a built in i/v stage? If so what is the design of the built in i/v stage?

Where can I find information about its power supply design? One single AC input seems to be very basic. Is it good enough? I see that many high performance digital gears feature multiple AC supplies. The processor must be quite noisy. How is the noice isolated from entering R2R ladder?

 

[bambadoo]

Have you looked here
Soekris Engineering ApS, Products

And this "official" thread
http://www.diyaudio.com/forums/vend...crete-r-2r-sign-magnitude-24-bit-384-khz.html

I am sure some of your questions may be answered there.

 

[vdi_nenna]

Although I'm slightly embarrassed to ask the Forum - please could you advise as to whther, if using +12V 0V -12V DC power supply to the Soekris DAM 1021 board, should I connect it as I have drawn on the reference manual page?

I've just received my board and don'twant to make a stupid mistake and watch smoke curl into the air above it.......!

Thank you Forum

Try here: https://hifiduino.wordpress.com/2015/03/16/soekris-dam-1021-r-2r-dac-users-guide/

 

[quantran]

Have you looked here
Soekris Engineering ApS, Products

And this "official" thread
http://www.diyaudio.com/forums/vend...crete-r-2r-sign-magnitude-24-bit-384-khz.html

I am sure some of your questions may be answered there.

Thanhks bambadoo, I found information about the power supply at wordpress. It was initialy blocked by my ISP.

I am still looking for information whether there is a current output from the r2r network. The official thread is over 500 pages :-(

 

[canvas]

Thanhks bambadoo, I found information about the power supply at wordpress. It was initialy blocked by my ISP.

I am still looking for information whether there is a current output from the r2r network. The official thread is over 500 pages :-(

quantran,

It's voltage out only. If I am not mistaken, there seems no current mirrors on the board.

 

[quantran]

I thought by applying a reference voltage (the documentation mentions about this vref) to r2r network we would get a current signal at the output like a BB r2R dac chip?

 

[soekris]

The soekris dam1021 is native voltage out, with a output impedance of 640 ohm from the raw output and 10 ohm from the balanced buffered output. No I-V converter is needed.

 

[quantran]

Thanks, Soren. I was just thinking about any possible DIY thing that can be done with your DAC. Do you recommend to use external DC power supply as an upgrade or there would be no audible difference compared to the built-in supplies fed by AC i.e. Just a transformer.

 

[Curious Fitz]

Try here: https://hifiduino.wordpress.com/2015/03/16/soekris-dam-1021-r-2r-dac-users-guide/

Many thanks vdi_nenna - that guide is really helpful