Build thread - building the Subbu DAC V3 SE

I don't think that JP tried the 4.7uf part that I liked and I know that I haven't tried the 1uf part that JP suggested.

Both true.

I suspect that JP likes the 2.5mm part because he thinks the smaller spacing leads to lower parasitic inductance which is a good thing for this application.

You'll see that the 1uf 5mm part is actually slightly better than the 1uf 2.5mm part. But the layout of the 2.5mm part on the board is slightly better. So both probably are fine.

First one true. Second one possibly true with high amount of assumption 😉 You can look at the complete design thoroughly and think that its performance is mostly due to short tracks and compact layout. I just followed my gut feeling.

p.s. JP - if you really want to drive people crazy you'll tell them which orientation of the MKS capacitor sounds better 😉 .

Eh....what's left of my credibility would be gone.

Coincidence has it that I also own an Audiosector DAC as the predecessor of the Subbu-DAC... and likewise it gets beaten by the latter.
Hate to admit it because I really like the NOS DAC (latest gen. with the Bobken reg), but the Subbu/JP-DAC simply has the better treble region sounding very close to analogue. The other thing I really like about the ES9023 in this implementation is its openess: it throws a huge soundstage where I can follow everything with ease... it's just there.

I am listening to headphones only and exclusively using various tube amps and 'The Wire', and the JP-DAC (Jeez guys, don't you have a name a bit more handy...? 😉) manages it to fit a 10m stage of a classical recording into my head... so to speak. Convincing.

The only thing that bugs me now is that I have to build a really nice case for the JP-DAC to match my Peter Daniel NOS 😛

Hi Oliver, it's called Subbu V3 or just the Subbu DAC (Subbu digital analog Wandler to stay close to the roots 😉 ) which should be easy to say in german...Also "u" wie in "muss" und dann S-u-b-u. Fur die Aussprache kannst du die zweite "b" einfach vergessen. In english it is pronounced with "ou" like in "you" also with one "b" so soubou....En français c'est la même: soubou. In Swahili it is .... etc etc. We thought it sounds quite organic and Subbu (the guy) did not object at all when told his name would be the best for the DAC 😉

OK, how to get somebody to do something for you:

Now you know I like your work etc etc but I just saw your case for the DAC and ..I would not mind that you would make such a case for me. You know, we've been friends for a few weeks now and you like the DAC... 😀
 
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Eh, c'est "ou" comme en "fou"....

Coucou ! Je ne suis pas fou ! Ou ?! C'est Soubou (phonétique), malgré c'est écrit different.

So despite lf the way it is written it has an Indian origin which implies it should be pronounced accordingly. I tried to write it phonetically...

Eldam, we 're going to have trouble with the mods ! Told you so 🙂 Rules, regulations, standards...C'est un forum international et nous savons c'est interdite de ....
 
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😛 you right... for the mods 😀

In english subbu is Soubou but read in french Subbu is prononced Subbu 😛

I think some french pronounce it at the english mod because they know english but the rule of prononciation in france are strict like the length of a dress in Scotland ( in France...we are less strict about the dress... maybe the same after all... above the knees).

He JP, you notice the word game with t'as bu and t'as bou ? (= "You drunk" and "you drounk"). You drunk is not tabou !

Maybe there is a special function with Subbu to pronounce itself its name : plug onto 230 V without trafo and you will hear : "SOUBOUUUUUUUUUU" :nownow:

Pfff... I still waiting parts from Mouser (ldo an XO chip)....and I still write english like a frog !

Sorry for others here for the loundge discussion !
 
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I'm getting some very good 3D/360 room response with the V3.
I bet it does!!
@ Bob: I have become a headphones guy with the birth of our daughter... somehow speakers diddn't fit into the scene anymore. So I sort of retracted myself into the almost silent world of headphones. I usually listen sitting very reclined and close my eyes... and the music just enfolds in front of you. Plus I can still listen at almost live sound pressure levels... without disturbing anybody.

@Jean-Paul: Thank you for deciphering the name into all common and not so common languages. I just wanted to give you some credit ... 😉

As to this: "Now you know I like your work etc etc but I just saw your case for the DAC and ..I would not mind that you would make such a case for me. You know, we've been friends for a few weeks now and you like the DAC..."
I don't quite catch that one... must be the flu that I am still dealing with... head full of bacteria and amoeba and god knows what. Give me a hint... yours truly?
 
Stixx inspired me to combine the V3 and an 02 headphone amp I'm using as a pre for some Pass amps. Haven't done any extended listening, but the pair sounds great together.

What came to mind was adding an 1/8" (the 02 is all 1/8") switching convenience jack for dual use in a final chassis build. Two questions:

1. The DAC maintains separate grounds on the output. Does combining them degrade the signal in any way? JP/Subbu must have had a reason to keep them discrete.

2. Is there an advantage to switching between RCA and barrel compared to just leaving both active? Does the V3 see the the open set as some kind of leak?

Barrel Audio Connector.
 

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HI
I received my spare parts this morning and just populate the faulty ldo reg, no problem with the 50 mhz FOX XO... it sings like a "renard" !

The music flows, everything is allright. No Ziiiigouilliiiii or crips can be heard with the speakers !

Music feeling is good after few tunes. It's very "natural" , easy, highs are sweet and not glitchy. Timbres, tones are true. Maybe the soundstage, imaging are a little confused. Maybe violins in highs could be better but it's the best thing I've heard at home !


Will come back after different expensive tests, few tweaks with PS and caps to setup with my environment. Sure the sound can be improved and I will write a little listening reviews with the JG buffer (still waiting for the BOM to come from Mouser... because the Fastron inductor out of stock)

Thank you JP, Subbu, and others for tips. It helped me a lot. Beautifull dac? Yes...A "bravo" for the design and optimisation at such a low price.

regards
Eldam
 
received my fully built PSU/DAC from korben; it's teeny-weeny!!
...I'm looking at a teeny-weeny chassis with a BNC, 2 RCAs and power jack at the back; anything ready available? 🙂

Otherwise for a toslink connection (GP1FAV51RK0F); what do I need for the bypass capacitor (0.1 uf, no SMD please) on the receiver module? ...capacitor choice is a bit like black magic to me!
What's the general capacitor type/brand to use across the VCC/GND on analog or digital ICs? ...os-con?
 
I have finished my build. It's got all recommended parts apart from the WIMA 4.7 in C35. Mine has the BC128 SAL-RPM.

I'll get it up and running in the next few days and report back on how it sounds.
 

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Indeed. I've left the beads off so that I can check voltages when I power it up.

I had more solder on the pads than I wanted, so I wicked some away. Admittedly, I did wick a bit more away than I had intended. While the pads are now only lightly tinned, the leads still have reasonable fillets so I decided not to redo them. I checked them very carefully with a magnifier.
 
OK, another dutchman having a good DAC. Let us know how it sounds after a few days.

Did you replace the 3.3 V reg for a 3.6 V one ? If not please be aware that the 130 kOhm must be changed if you keep the DAC running on 3.3 V.

I had more solder on the pads than I wanted, so I wicked some away. Admittedly, I did wick a bit more away than I had intended. While the pads are now only lightly tinned, the leads still have reasonable fillets so I decided not to redo them. I checked them very carefully with a magnifier.

Reasonable is not a good word when building quality gear. They really look like dry joints. Resoldering would be a wise thing IMO or it must be that the chip has seen the soldering tool too many times now. If so it is maybe better to leave it like it is.
 
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...snip

Reasonable is not a good word when building quality gear. They really look like dry joints. Resoldering would be a wise thing IMO or it must be that the chip has seen the soldering tool too many times now. If so it is maybe better to leave it like it is.


When the designer suggests for a second time that I should touch up my solder joints, it's wise to pay attention 🙂

Shiny new solder joints 😀
 

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