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

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#4,921
matt_garman said:
glt's blog has a nice write-up of the VREF mod. If you scroll down to the near-bottom, there is this comment from Paul (timestamp July 25, 2015 at 04:31):



Based on the timestamp, I'm pretty sure that the factory mod he's referring to is revision 2 (since revision 3 was end of 2015/early 2016).

But then Søren said this in post #4291 (emphasis added):



So, if I'm piecing this info together correctly, VREF capacitor values are:
Revision 1: X uF
Revision 2: X + Y uF
Revision 3: X + Y + 300 uF
Not sure what X and Y are. Also not sure if X+Y+300 is "enough". But, with those revision 3 through-holes, it looks to be a trivial mod, and presumably it can't hurt (right?).
Click to expand...

I see all these shift registers are powered from the same source why dont addup just a large capacitor of value may be 44,000uf and it will definitely reduce the ripple to substantial level and yet the decoupling will do its best as its close to the chip.
 
#4,929
Guys, may I ask a few simple questions which might hve been answered before, but 124 pages of reading...thats just a bit too much. So:

- Is the BBB direct i2s integration incl. feeding the clocks into the bbb by now a standard application ? I would see this as the ultimate in order to avoid all the usb issues ?

- I there a native balanced solution or is this by nature a SE-Dac ? The sabre is balanced by nature...

- What will bring the Dual-Mono-version ?

THx
 
#4,930
Blitz said:
Guys, may I ask a few simple questions which might hve been answered before, but 124 pages of reading...thats just a bit too much. So:

- Is the BBB direct i2s integration incl. feeding the clocks into the bbb by now a standard application ? I would see this as the ultimate in order to avoid all the usb issues ?

You can forget about clocks - this one is almost immune to bad clock - yes really.

- I there a native balanced solution or is this by nature a SE-Dac ? The sabre is balanced by nature...

It is SE "by nature".

- What will bring the Dual-Mono-version ?

😕

THx
Click to expand...
 
#4,933
I haven't tried, and i haven't seen anybody reported testing difference between the two.

But it is still hard to compare both - because if the gear after the DAC is built fully balanced - then there are of course losses feeding SE signal to a balanced stage (like a Pass Labs pre-amp/power amp combo). Pass pretty much always sound better with a balanced input signal, which they are actually built for.
 
#4,934
I know the feeling of being overwhelmed with these threads that are full of great information!
I got the normundss boards (input/switch and mute) and am wondering how to hookup psu. I assume one psu per dam1021.
Just need to decide "which" psu I'm going to use and what is the best input voltage.
Considering oa-core transformers, it has three outputs
sets of outputs for versatile application
18-0-18 --- 1a
9-0 --- 0.8a
9-0 --- 0.8a

I figured the 9v would be fine for the dam1021's... Anybody care to comment? I plan to use a regulated psu for each 9v output from the trafo.

I am considering a psu off eBay from sellarZ - uln-ps1 bi polar psu. One for each dam1021.
I really would like to find a way to make a psu with belleson superpower mk2 regulators. I've used those in another project and never have I heard a more quiet source.
I'm a beginner with this but have spent a bit of time trying my best to learn. I really want to have a good regulated psu for the dam1021 and not cut corners. I'd like to get the very most out of this build. I really hope I am able to get the help I'll need to get my project complete. I will be on this thread a lot more often now. I just received my two 0.02% soekris dam1021's in the mail, the newest revisions. I didn't realize this version had improved onboard psu with 1000uF/16V caps now. Instead of the 820uF caps it had before. I was going to upgrade those but glad that already had been done.

I hope to get a lot of good advice on how to get My dual dam1021's setup correctly with the normundss boards. I also have been talking with kevinyip about getting a display done for the front panel. I hope it's compatible with the normundss mute kit/front panel selector.

🙂
 
#4,935
Well, I guess we have two different opinions...tnt : Se always vs. dual- mono: it can be balanced by nature ? I am confused.

I am running a push-pull tube amp with a diff.amp/pair as the next stage after the dac. so, the best balanced input signal would be a benefit. no phase splitter necessary, plus noise cancellation of the balanced signal path...
 
#4,936
Which caps for the DAM refs

I'm looking for caps for the ref Mod on DAM revision 2 board .
There's a bunch of varieties for polymer caps in each brand.
Final choice would be between these 2 :

PLE series or RS8 series

The first one has better ESR (5mohm) but the second has better ESL (lower inductance) while still having a good ESR (8mohm).

I would suppose that lower inductance would be good at such location looking at the very irregular drawn current.

What would be your choice ? One of these or another flavor ? 😉

Laurent
 
#4,938
spike, I haberead through most of your posts and setup, but can you do me a favour and explain a bit more how your setup works precisely ? I would love actually to avoid a usb-receiver and connect the clocks from the soekris board back to a bbb and have a direct i2s connection, but all of that in dual-mono and fully balanced.
 
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