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Old 9th January 2003, 09:11 PM   #1
LennyK is offline LennyK  Poland
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Default Lars Nielsen DAC, comments?

hi

Enybody built Lars Nielsen DAC?

http://home.worldonline.dk/hifiside/ecdafsp.htm

any comments?

best regards

Lenny
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Old 10th January 2003, 04:11 AM   #2
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I would be very tempted to build the Digital section, but to use the Pass Labs D-1- I/V and output stage. It would be a bit more complex but is much more advanced than Lars simple output stage is. Not to say his does not sound good...as I'm sure it does. I just like the stuff that Nelson does in general. I also find Lars power supplies a bit odd, and not the usual high end stuff. Perhaps those parts are easier for him to get in his location.....
I certainly do give him credit for putting it all together!
Mark
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Old 2nd May 2003, 07:09 PM   #3
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Mark,

Did you build the digital section of Lars's DAC?

I myself are very tempted to do so. Would just like to hear some opinions first.
Would also like to know more about a more "high end" like psu

Henrik
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Old 2nd May 2003, 11:45 PM   #4
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I noticed the PCM1730 too. Looked like a very nice chip for a simple, small parts count DAC.

So I ordered the chips and got them yesterday. The PCM1730E is a SMD, a very, !very! small one. It looks too small to solder by hand. A good PCB might help. Does Lars Nielsen sell PCB's? I would be very interested.

The Lars Nielsen design looks good to me. The power supply is perfectly fine. These cap-multipliers have a PSSR of 70dB typical up to the MHz range. Very high frequency might be transmitted through the transistors CE capacitance. I figure you need a shunt regulator in series after a cap-multiplier to block that. That should give a PSSR of about 110dB up to 10's of MHz. For I/V I would use a discrete design just for fun.

Regards,
Thijs

PS
Although all specs are given for 24bit only, I would say that low level (-60dB) 16 bit performance might not be up to par. Does anybody know how this chip deals with 16bit data? Is it rescaled to fit 24 Bit data? Can we then convert the 24bit data diagrams to 16 bit performance diagrams by adding 50dB to the Y-axis?
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Old 3rd May 2003, 01:41 AM   #5
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No, Unfortunately I have not had the time as of yet. we are VERY busy at work...but thats a good thing too. I will let you know when I do....and I'm also interested in how the 16 bit performance might come out......
Mark
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Old 3rd May 2003, 06:40 PM   #6
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Question Site down?

Hi,
Is Lars Nielsens site down? I got a 404 error...
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Old 3rd May 2003, 06:45 PM   #7
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Hi Elso,

I'll sure be interested in your opinion of this design. Do you know of any SMD SOIC to DIP adaptors for thios tiny tiny chip.

Regards,

Thijs


http://www.diyhifi.dk/projekt2.html
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Old 3rd May 2003, 07:00 PM   #8
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Smile Thanks!!

Quote:
Originally posted by tschrama
Hi Elso,

I'll sure be interested in your opinion of this design. Do you know of any SMD SOIC to DIP adaptors for thios tiny tiny chip.

Regards,

Thijs


http://www.diyhifi.dk/projekt2.html
Hi Thijs, Thanks for the working link.
What can I say about about this DAC?.
To start with the powersupplies See the high speed diode thread for better alternatives for the 1N4001. Still wondering about the arrangement of the rectifiers...
The emittorfollower regulator is similar in basic design to my triple Darlington, but a simple zenerdiode looks crude..
Ask Joko about opamp as IV-converter

Browndog has nice SOIC to DIP adapters
www.brndog.com

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Old 3rd May 2003, 07:32 PM   #9
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New site for the DAC: http://www.diyhifi.dk/projekt2.html

Petter
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Old 3rd May 2003, 09:02 PM   #10
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Thanks for the link.


gr,
Thijs
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