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About LinkBacksI dunno, it's hard to tell if there is a solder mask when FR4 isn't used, which seems likely here. I'm assuming stencils were used for the SMT stuff, so I'm betting there is some sort of solder resist layer.Originally Posted by n_maher
Re: Ayre USB DAC
I dunno, it's hard to tell if there is a solder mask when FR4 isn't used, which seems likely here. I'm assuming stencils were used for the SMT stuff, so I'm betting there is some sort of solder resist layer.
Re: Ayre USB DAC
Is the unmodded dac not passive i/v?
Icarium panics and attempts to flee!
Re: Ayre USB DAC
By "unmodded" do you mean pre-production?
Re: Ayre USB DAC
Production board looks great. Is that a fully discrete output stage? Nice!
Re: Ayre USB DAC
I meant the dac in the more recent pictures. Justin hypothesized the first pictures were of a "modded" unit so I just repeated that, shrug.
Icarium panics and attempts to flee!
Re: Ayre USB DAC
Damn I love me an FPGA.
Home: [Denon 2900] -> [M^3] -> [ATH-W10VTG]
Desktop: [Denon 2900] -> [Denon 2500] -> [Focal-JM Labs Chorus 706v]
Office: [HP Mini 1000] -> [ATH-ESW9]
Portable: [inano4] -> [JH5pro]
Speakers: [Denon 3910] -> [Denon AVR-987] -> [Kef iQ9]
Re: Ayre USB DAC
I wish I could buy those PRP resistors
Re: Ayre USB DAC
Can't see anything out of the ordinary in the pic. What's so special about those PRPs?I wish I could buy those PRP resistors
Rotel RCD-855 | Counterpoint SA5.1 | Odyssey Stratos | Von Schweikert VR4 GenII
Rotel RCD-855 | Gilmore | K601 / K271S / SR-60
Re: Ayre USB DAC
1/8w from the looks of them which can't be bought anywhere.
Main rig: APL 3910 32bit -> DIY Blue Hawaii, ES-X
Computer rig: Trends UD-10.1 -> AudioZone DAC -> Supercharged Egmont
Headphones: SR-007
Re: Ayre USB DAC
I now want this DAC.
"It's a pressure valve. It won't open unless there's tremendous pressure."
Re: Ayre USB DAC
What DAC chip is it using? I think I can make out PCM1796?
Andrew if you have the unresized photos could you attach them to a new post? (IIRC there is no size limit to photo attachments)
Last edited by deepak; 07-04-2009 at 10:46 AM.
Re: Ayre USB DAC
It is the 1796. I'll post a link to the Flickr set with the full-size images when I get home.
Re: Ayre USB DAC
They are the .1%, 25 PPM/C versions:
http://www.prpinc.com/pdf/Audio_PR9372_Series.pdf
Re: Ayre USB DAC
"Available in small quantities"....perhaps a group buy is in order?
Main rig: APL 3910 32bit -> DIY Blue Hawaii, ES-X
Computer rig: Trends UD-10.1 -> AudioZone DAC -> Supercharged Egmont
Headphones: SR-007
Re: Ayre USB DAC
Here you go, Deepak.
This attachment thing is cake. How come I never bothered to learn to use it before?
Last edited by Hopstretch; 07-04-2009 at 11:36 AM.
Re: Ayre USB DAC
Thanks, can't wait to hear this too!
Re: Ayre USB DAC
Heh! You want all DACs.
It's not arms or legs
Re: Ayre USB DAC
A couple of pages ago he said he wasn't as interested anymore because it was USB input only.
I guess after she was stripped naked he fell in love again. Can't blame him.
Re: Ayre USB DAC
... me neither...
... ME TOO
At last a discrete, really balanced, output stage. If only she had SPDIF input... it's just me who likes she had more than one input to play with?
Re: Ayre USB DAC
If this had just one more input (BNC please!), I would stop dreaming about the Berkeley and buy this... but based on the layout with the USB receiving circuitry on its own board, which I would assume sends I^2S to the main board............. well it probably isn't impossible to design a S/PDIF input board! switching boards to switch sources would be pretty tedious however. Monseigneur Hansen... are you listening?
--jeff
"Some say he can smell a mylar diaphragm from ten miles away, and that his eardrums require a bias current of one point twenty-one jiggawatts... all we know is he's not the Stig, but he is the Stig's audiophool cousin!"
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