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

[derekr]

Thanks again.

 

[TNT]

Beware when e.g. sawing carbon fibre as it is not any good to inhale.


//

 

[analog_sa]

How is it that the soekris DACs managed to get away with taking the output straight from R2R network

I would assume it is only a question of resistor values. Perhaps thermal considerations prevent the use of low value resistors/high current in integrated chips. Just speculating.

 

[analog_sa]

Beware when e.g. sawing carbon fibre as it is not any good to inhale.

//

Fortunately no longer a health concern as everyone wears N95 masks

 

[zfe]

I would assume it is only a question of resistor values. Perhaps thermal considerations prevent the use of low value resistors/high current in integrated chips. Just speculating.

No, it depends on how you use the R2R network, forward or backwards, i.e. which pins you use as input or resp. output. Depending on that you have the output as voltage or current, see e.g.

https://www.analog.com/media/en/training-seminars/tutorials/MT-015.pdf

 

[derekr]

How is it that the soekris DACs managed to get away with taking the output straight from R2R network while the old R2R chips required active I/V to get good measured performance?
Some knowledge or tech they didnt have back then or does this approach have another compromise?

Well, according to the tutorial zfe linked, an R2R implementation has a very stable output impedance and the chosen implementation in the DAMs is a pure voltage source. No need for I/V. The ‘old R2R chips’ that needed I/V must have been current sources. Just speculating

 

[analog_sa]

Thanks zfe!

 

[tiggerkater55]

hi everybody again,

please could someone tell me (newbie), if i would be satisfied with a (used) rev.2 board for building my first dac, or if i should better buy the newest version rev5. thanks in advance.

 

[modmix]

19th April 2020, 06:24 :
yes, thanks. but i really would like to get a version from 3rd rev. onwards.

Why are you asking as you seem to be decided, already?

please could someone tell me (newbie), if i would be satisfied with a (used) rev.2 board for building my first dac...

Guess it fully depends on you.


BTW:
Soekris dam1021 Sign Magnitude R-2R DAC | Dimdim's Blog:

Update (Nov 2015): Soekris has released a Rev 2 of the board, with improved Vref power supplies and a better muting circuit. It is available in just two resistor grades, a 0.01%/0.02% mix and 0.05%.

Update (Feb 2016): Soekris has released a Rev 3 of the board, with further improved Vref power supplies (more capacitance). It is available only with 0.02% resistors.​

 

[TNT]

I would have bought the 1941(21) and run it over USB. Maybe with an optical isolated USB.

This is probably the best sounding option today. Myself, I own one 1021 and two 1121.

//

 

[myleftear]

yet another Q

Sorry, this has been asked a thousand times already, I'm sure...

before I ask the obvious one question—is there sort of a FAQ / assembly-guide for newbies?

because, as a newbie, I'd like to see (or read, if pictures aren't available) wether I'd be able to assemble one, what parts are required, if it could be integrated in a pre, etc...

I'm kinda scared of those multi-thousand-posts-threads, sorry!

david

 

[paulebappie]

Sorry, this has been asked a thousand times already, I'm sure...

before I ask the obvious one question—is there sort of a FAQ / assembly-guide for newbies?

because, as a newbie, I'd like to see (or read, if pictures aren't available) wether I'd be able to assemble one, what parts are required, if it could be integrated in a pre, etc...

I'm kinda scared of those multi-thousand-posts-threads, sorry!

david

First post....
The Soekris R-2R DAC: Technical Details | H i F i D U I N O

 

[zfe]

There is an old manual (dam1021 user manual 20151005) at Soekris Audio ApS, Downloads

 

[myleftear]

First post....
The Soekris R-2R DAC: Technical Details | H i F i D U I N O

Got it, thanks! (The old manual too)
Sorry for my laziness...
David

 

[ForsbackaKalle]

I would have bought the 1941(21) and run it over USB. Maybe with an optical isolated USB.

This is probably the best sounding option today. Myself, I own one 1021 and two 1121.

//

I read the spec for 1941/21 and do not fully understand the difference? Can someone explain?

 

[boxerfan88]

I read the spec for 1941/21 and do not fully understand the difference? Can someone explain?

1941 = 4 banks of R2R, running in differential mode

1921 = 2 banks of R2R, running in single ended mode

 

[Ryssen]

I have powersupply that gives +-7,5 will The DAC work wit that,givin its best?

 

[Ryssen]

Messauring fault..
It gives +- 15v
I guess I should trim it down to +-10v.

 

[Ryssen]

Anyone used a switch between raw output and buffered output?

 

[bmxmen]

This is absolute full moded 2x dam1121. Plays very nice.