let 's share my DAC

[takashi]

let 's share my DAC
http://www.audioworkshop.com.hk/report/d2_pre/d2_pre.htm

 

[Tieftoener]

Thanks for sharing your work, but could you give us a little explanation and more detail for those of us that don't read Chinese?

Nice looking boards!

 

[peranders]

Very nice CAD job! Cool with round corners of the traces.

Can't you try to write in english at your homepage?

Are the holes gold plated? Very nice!

Schematics, please!

 

[li_gangyi]

I can probably do a quickie translation...just gimmi a few moments here...

 

[li_gangyi]

Ok here it is...
------------------------Strat Of Translation-------------------------------------
This time round we're gonna play around with the Analog Device's AD1955
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Pictures of the DAC
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I did the PCB twice. The first was without the Sampling Module. The second time round, the PCB is more complete and has got a "high-end" feel to it.

I also can now play around with the parts and use better grade stuff for the project.

I used SMD parts this time as they have lower noise and lead inductance compared to through hole parts. This helped to reduce overall noise and increase performance.
----------------------
Another Picture
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From the AW-D1 onwards, all the DACs will be using an external power source, which will make he circuit more flexible. The DAC and DIR1730 will have an "Upgrade module", which makes it easier to add in an Unsampling module and Re Clock Module.

This time round with the AW-D2 I used a DIR1703 and made a few improvements, and compared to the DAC 1.0 it's a very big improvement. I also used a TCXO clock in this design, it is now my current favourite, therefore I had to use it~!!!

Because the D2 uses a AD1955, it is very different from the BB(T1), the sound is very strong, and worth a try.
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Insert Picture here
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In the anlog filter stage, there a few "special" components, namely the 681Ohms resistor. Let's not be afraid, we're not in deep water...yet...those are Dale resistors, and are an intergral part of my design, although it may seem odd...it must be there.-------------------------
Insert another Picture
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If the D2's production is on time.The PCB will probably be released in the Christmas or 2004's New Year region. Do await further announcements.
---------------------------End Of Translation-----------------------------------

I know my Chineses sucks...I am kinda borderline in my Mother Tongue..I'm actually better in English...so please excuse any obvious Errors...maybe some of u might want to correct me~!!!

 

[peranders]

You don't have to worry a thing about your english. It's good

 

[takashi]

hi li_gangyi
thanks a lot!

and the schmetic file will be release later, please d/l it later.
in fact i want to post here, but the file size is too large..

 

[Kravchenko_Audio]

Beautifull Work!!!

A fine job. Are you going to share the design in the form of pcb patterns or schematics???

Mark

 

[hifi]

the scheamatics are on his site aswell as really cheap pcb:s

/ micke

 

[takashi]

of course i will post the design in the form of pcb patterns or schematics in my website.
but need to do it later, since i am very bust within this 2 week...
THANKS

 

[takashi]

hi, this is the like to d/l the sch file~

http://www.audioworkshop.com.hk/download/d2_sch_pre.pdf

and i will post the silkscreen of the board later

thanks

 

[fantomas]

SCHEMA

Has somebody available this wiring diagram???

 

[tobias_svensk]

Round traces is always cool, I think I must begin with that.

 

[Elso Kwak]

hi, this is the like to d/l the sch file~

http://www.audioworkshop.com.hk/download/d2_sch_pre.pdf

and i will post the silkscreen of the board later

thanks

Takashi, Link does not work!

 

[Elso Kwak]

Round Traces

Round traces is always cool, I think I must begin with that.

Hi Tobias, When I posted the suggestion to use round corners for the tracks for a PCB of my clock this was a joke! So much for "cool".

 

[Elso Kwak]

Parallel flip-flops?

Hi Takashi,
Why two parallel flop-flops in the reclocker? Or is this a drawing error? I don't see much use for a reclocker after a asynchronous sample rate converter/receiver as everything is already "reclocked".
AC logic should be avoided as the black pest or in modern times aids.
SMD parts have lower noise? Cannot believe what I am reading.........

 

[takashi]

sorry, the link is updated

http://www.audioworkshop.com.hk/download/AW_D2.pdf


because the sch. and pcb are confirmed.

for SMD issue, smd have lower esr, lower lead inductance, short lead, etc
so it is good in noise bypassing(theorical).