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The SkeletonDAC - Page 2

post #16 of 192
3/3/11 at 7:26pm

Thanks nikongod.  That was kind of what I thought but just wanted to make sure.  Makes a lot more sense now.

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post #17 of 192
3/4/11 at 7:03am

This is awesome! I made a GrubDAC that I installed internally on my EeePC to make up for the subpar onboard sound but I've obbously had to carry around an externa amp whenever I wanted to use my headphones. Not so practical. Since this board has the same footprint I'd definitely be interested in swapping it out.

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post #18 of 192
3/4/11 at 4:18pm
Quote:
Originally Posted by nikongod View Post
We put a DAC in your DAC so you can convert your digital stream while convert your digital stream. 


I loled

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post #19 of 192
3/9/11 at 12:31pm
Thread Starter 

There is a few prototype boards on there way from the US up to me.

 

When I get them, I will offer then out to interested parties.  One part that needs to be tested as I don't have the right stuff is the "DAC in your DAC so you can convert your digital stream while convert your digital stream" as nikongod put it.

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post #20 of 192
3/10/11 at 5:49am

I'm looking forward to doing this one as well as the pup dac.  I will be curious to see what difference it makes as a converter to another dac.  Hopefully all goes well and it makes things better.  I'm planning to do a gamma2 in the next month or two and will be able to do a little comparison.

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post #21 of 192
3/17/11 at 5:27am
Thread Starter 

Okay gentlemen, I have a BOM:
http://dl.dropbox.com/u/630887/SkeletonDAC-r1-bom-a.xls

 

The BOM list multiple choices for the output caps, depending upon your preference.  I have not put the case on the BOM, but it fits the Hammond 1551H.  If you are using the Hammond case, you need to watch your output cap height - approx 10mm is max.

 

And I have 6 boards to give away as prototypes.

Rules are similar to what I did with the pupDAC:

  • One board only per person
  • $5 CDN shipping to anywhere in the world

  

Looking back at the thread, the following 5 expressed interest, leaving one board
    Armaegis
    nikongod
    c12mech
    onyu
    RedLeader

 

My only criteria is that I'm looking for a least one build of either a SPDIF or Full build, as I don't have the right stuff to test this myself.  That means until I hear what the people on the list intend on building, the last board available will go to someone who expresses that they will build and test the digital out.

 

If those that have expressed interest can confirm continued interest and build type, either in the forum or PM, we can get this moving along. 

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post #22 of 192
3/17/11 at 6:47am

I would be willing to do a full build and have another SP/DIF input DAC (DIR9001,PCM1793,LT1364) I can test the output with.

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post #23 of 192
3/17/11 at 9:09am

Any chance of a group buy for the BOM?

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post #24 of 192
3/17/11 at 10:29am

Oh It has a headphone amplifier too. I would have expressed my interest if I had noticed that before. 

 

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post #25 of 192
3/17/11 at 10:33am

I did a BOM for Digi-Key if anyone is interested.

 

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post #26 of 192
3/17/11 at 5:34pm

I don't need the SPDIF out (I've got a udac2 kicking around) so I'll be doing a more barebones build.

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post #27 of 192
3/17/11 at 8:37pm

I just finished going through the bom and have some questions since the schematic does not have values for components. 

 

C11 says 10uf, p/n listed is 22uf

C6 says 100uf, p/n listed is 220uf

R3,R4 says 22 ohm, p/n is 22.1 ohm

 

Just want to know about these before I order.

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post #28 of 192
3/17/11 at 11:16pm

I'd be willing to try the full build. That said, I'm still kinda new at all this, so if an experienced builder wants the spot I don't mind being bumped.



Quote:
Originally Posted by Avro_Arrow View Post

Any chance of a group buy for the BOM?


I'm in for this.

 

p.s. interested in the digikey BOM as well.


Edited by Armaegis - 3/17/11 at 11:18pm
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post #29 of 192
3/18/11 at 5:06am
Thread Starter 

So Avro Arrow has offered to do the full build, so everyone else that was on the list need not worry.  If you are on the list in post #21, can you please confirm or deny participation to me?  Best way to confirm participation to me  is to PM me your mailing address (formatted so I can just print it out and tape it to the envelope) and the e-mail address I can send the Paypal request for the shipping.  Also let me know if you don't want to participate as there are others that are interested.

 

 

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post #30 of 192
3/18/11 at 5:39am
Thread Starter 
Quote:
Originally Posted by c12mech View Post

I just finished going through the bom and have some questions since the schematic does not have values for components. 

 

C11 says 10uf, p/n listed is 22uf

C6 says 100uf, p/n listed is 220uf

R3,R4 says 22 ohm, p/n is 22.1 ohm

 

Just want to know about these before I order.

 

C6 is a bulk capacitor for the board.  Largest value that fits is a good choice.  100uF is a guideline, but the 220uF listed is chosen as biggest that fits the case.

R3,R4 - termination resistors on the USB data lines.  There is a range of acceptable values

C11 - decoupling for the common voltage in the DAC.  10uF is datasheet, IIRC, but I'd read that the large value helps improve performance, which is why the part is spec'ed as such.


 

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