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Old 12th August 2018, 08:47 PM   #41
kenta16807 is offline kenta16807  Sweden
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Join Date: Sep 2005
Quote:
Originally Posted by kazap View Post
You might like WASAPI event mode 24 bits output with Resampler-V to use SOX at any rates you want with tailored impulse.
Thanks, I haven't looked at foobar2k plugins for quite a while...
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Old 20th August 2018, 02:58 AM   #42
phongnavy is offline phongnavy  Viet Nam
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Join Date: Feb 2014
Location: HN
Default My PCM1704 DAC

PCM1704 x 4
Only for CD transport
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Old 20th October 2018, 12:05 PM   #43
djcornel is offline djcornel
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Hello everyone, i have done the PCB for these chips, my design inspired from the original evaluation kit and adapted to work without oversampling. I will keep you updated with my project.
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Old 29th October 2018, 08:45 AM   #44
djcornel is offline djcornel
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This is what i have done so far, i will put more pictures when i will end it.

PCB Prototypes | Facebook
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Old 25th November 2018, 09:28 PM   #45
kenta16807 is offline kenta16807  Sweden
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Nice, keeping it simple - wish I could...

Hmm, wonder why I don't get notifications from the forum - I only saw this today.
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Old 11th February 2019, 12:14 PM   #46
samoloko is offline samoloko  Bulgaria
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thank you for sharing details about your pcm1704 converter
you changed stacked ad844 + opa627 to opa861 + opa861, and shunt regs to serial regs with LT3045
any experience with discrete buffer (Joachim Gerhard / EUVL jfet buffer, SparcosLabs, diamond buffer) Instead of opa861
did you experience offcet from opa861

Quote:
Originally Posted by sontero View Post
...well said jesper
I would like to draw attention to my personal interpretation of the most appropriate use of the PCM1704 chipDAC. My work has developed using just the JLSounds I2sOverusb USB card that is able to process the i2s signal in the language accepted since 1704 without needing any logical glue (useless with JLSounds). Not to mention the whole process refer to the description made for friends in my Italian forum.

In the mature form of my construction there is a motherboard that connects two mono miniboards that welcome the pcm1704 with the jlsounds. moreover, the IV card based on the OPA861 is used, both for conversion and as a buffer (circuit taken entirely from the P.Rogic project for the AYA DAC). All power supply(six) are currently based on the LT3045 (Ivanov boards).....previously salas shunt.....and previously others shunt

How does it sound? Really very good both for me and for many friends who wanted to replicate it.

PS..... my nick in italian forum is bigtube
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Old 11th February 2019, 09:58 PM   #47
sontero is offline sontero  Italy
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Location: Cagliari - Sardinia
My experience has been quite elaborate, but I have come to conclusions that are clear to me. The sense of using the 844 stack is to show the chipdac the lowest possible impedance. In this sense, the 861 reaches the goal better and with simplicity (this was the consideration that pushed Rogic in his AYA dac to prefer it to 844 in the evolutionary phase .... but not the only one). This, but not only this, affects the overall quality of the 861 conversion performance.
The buffer:
Both with the 844 (also in triple stack) and with the 861
I experimented with opamps all of high level: 627, 1641, 827.
With these I got excellent performance and the best was 827. to better evaluate, I then used two discrete circuits: the DCB1 and a diamond a bjt configuration. I preferred the latter in conclusion.
Stimulated by the enthusiasm shown by Rogic and also by other users, I finally tried the 861 in buffer mode. It was a beautiful discovery and became the final choice after repeated plays and comparisons. The only problem if we want is that the offset is present even if very limited. It can be eliminated by setting up a small circuit to balance and reset it. In reality, I did not and I had no problem. if necessary, a good output capacitor can be used.
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