Having run out of capacitors and since the ones from Farnell come in about an week I thought of taking some pics;
The PCB and the receiver/DAC is bought from here: http://www.rockna-line.com/diy/dac/dac.htm , and if anyone could answer this thread I would be eternally grateful!
And yes, dog hair and other dirt may get onto your PCB and mix with flux residue to form a nice combo if you're not careful 😀
The PCB and the receiver/DAC is bought from here: http://www.rockna-line.com/diy/dac/dac.htm , and if anyone could answer this thread I would be eternally grateful!
And yes, dog hair and other dirt may get onto your PCB and mix with flux residue to form a nice combo if you're not careful 😀
Attachments
Looks nice. Does the Rockna DAC come with I/V stage, or do you have to order the separate output board from them.
I think the separate I/V stage is for existing CDPs/DACs (owner told me it's supposed to sound better than an opamp based one but I cannot comment on that as I did not want to rip apart my Marantz CD-94 to try that 
)... the DAC PCB I have includes the I/V stage.
)... the DAC PCB I have includes the I/V stage.
The ASRC is set to 1:1 upsampling, so output is clocked after low-jitter master clock. The cost of the board is 29 euro.
Anybode else built this one? And if so, how does it sound 🙂
I'm looking for a DAC to build and for this one I have many parts already.
/Tobias
I'm looking for a DAC to build and for this one I have many parts already.
/Tobias
Well, I heard it about two weeks ago in the owner's system (Rockna preamp & monoblock amps, Dynaudio Contour 1.3 MKII, AudioQuest interconnects & speaker cables) and it sounded very nice (fast/detailed without being harsh and with well defined bass&midrange; maybe a a tad bit laid back in the upper treble range compared to what I'm used to but this is OK, vocals/instrument separation seemed more 'real' than in my system (Marantz CD94/passive atenuator/Randy Slone's OPTIMOS 200W monoblock amps/ Infinity RS II open baffle speakers). Too many different variables between the systems to draw a conclusion 🙁
I'll check how it fares against my Marantz CD94 next week 😀
I'll check how it fares against my Marantz CD94 next week 😀
The 1:1 upsampling is achieved by setting 1892's output sample freq. at 44,1 KHz - MCLK of 22.579 MHz (512xFs).
but this setting would not be called "bypassed" but resampled to same sampling frequency ?
rfbrw, is there any way to really bypass the reclocker?
rfbrw, is there any way to really bypass the reclocker?
To bypass the ASRC of AD1892 you have to simply set this in chip's internal control registers, but the jitter will pass through... 😀
Well, it's alive and kickin! Was in a hurry so for now some resistors are made up by two other values in series...
Using a Marantz CD94 as a transport the sound is great! I really think it outperforms the Marantz' analog out and that's not in a subtle manner. I won't comment with traditional "fuzzylicious bass, buttery mids or sweet and tender highs" terms 😀
Using a Marantz CD94 as a transport the sound is great! I really think it outperforms the Marantz' analog out and that's not in a subtle manner. I won't comment with traditional "fuzzylicious bass, buttery mids or sweet and tender highs" terms 😀
Attachments
Took some measurements for fun using a M-Audio Revolution PC soundcard, these seem almost too good to be true, except for the frequency response - non-OS DAC though; also, the freq test is limited to 44.1/2kHz so I couldn't catch any digital images due to non-os...
Of course, this particular soundcard's line in is not the best in the league so the DAC's standalone performance should be better (if that's possible)...
Of course, this particular soundcard's line in is not the best in the league so the DAC's standalone performance should be better (if that's possible)...
lucpes said:
The AD1892 will impose a digital brickwall filter even when
resampling at 1:1, such is the nature of how ASRC's work.
The idea of 0 x OS is to get rid of brickwall filter.
Cheers,
Terry
- Status
- Not open for further replies.