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Old 16th April 2009, 11:04 AM   #11
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I am refering to the following dac not the TDA x4 thought.

http://translate.google.com/transla...080707_1638.htm

Nick
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Old 16th April 2009, 12:21 PM   #12
tralala is offline tralala  Canada
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Hi Nick
I get a 404 with that link

Daniel
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Old 16th April 2009, 12:24 PM   #13
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sorry my friend



try this one

Nick
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Old 25th May 2009, 09:42 AM   #14
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Ok latest frustrating news

Yesterday i finished the dac but...
First the laptops were not updated ( i thing sp3 is needed in xp) so the usb recognize the device but prompt it will not worked. And it did not.
I tried with foobar 2000 and kernel avoiding but nothing.

So i put it in a desktop computer and voila !! it was recognized!!
Though it produced craking and ticking noises instead of sound.

So i thing the smd soldering might have to do with it.
Any ideas?

nick
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Old 25th May 2009, 10:44 AM   #15
tralala is offline tralala  Canada
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Did you tried a coax ??

Nice work btw

Daniel
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Old 25th May 2009, 10:49 AM   #16
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thanx for the comment.

No coax, in the evening i will do the rest of testing and measurements and try to locate the error.

Smd's are a pain. Anyways i will post photos after the enclosure and test results as well. Maybe the schematics if any one is interested in those.



Nick
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Old 25th May 2009, 10:49 AM   #17
tralala is offline tralala  Canada
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thank
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Old 16th June 2009, 02:58 PM   #18
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Ok here are some of the first results after fixing the error.

The error of course was in smd soldering duh!!!

After fixing it i tried everything with a copland amp, crystal audio system8 speakers and as source a laptop connected in the usb input of the dac and playing only flac's !!


results:

The crystal audio speakers are tower transmission lines but not very capable in the bass area without a subwoffer.
So i did expected tat the bass will be crippled somehow.

But the mids and that highs were killers !!!!!!!!! i did not wanted to stop !!!! as the time passed and the machine and tube was burning in, the sound expanded more.

After classical piano Amy winehouse came in. And i was amazed. I though she was there playing and perhaps drinking !!!

I did tried to work it as op amp and not tube output but the result comparing to tube was just poor!. So switched back to tube very very fast. Maybe this will change if i exchange the opamps with discrete.

So then i tried the optical input. I had an old cheapy dvd pleyer (united 35 euros) .

Again i was amazed.

Overall first impression. it worth all the trouble !!!!!!!! and more.

So stay tuned as i will test it with ATC 7 speakers and chipamps from Peter daniel.

Nick
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Old 16th June 2009, 10:37 PM   #19
tralala is offline tralala  Canada
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Fantastic will you have some pics ???
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