High-end NOS DAC Kit with PCM1704 up to 24bit/192KHz - diyAudio
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Old 27th July 2010, 08:04 PM   #1
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Location: Avignon, France
Default High-end NOS DAC Kit with PCM1704 up to 24bit/192KHz

After three years, many prototypes and intensive listening test, I present the Jundac Two, a high-end 24bit non-oversampling digital to analog converter. It integrates four inputs: S/PDIF or AES/EBU, an optional external clock for very low jitter operation and stereo fixed analog output.

A non oversampling DAC don't use any digital filter. Data coming from CD are directly converted to analog; there is no coloratura introduced by digital filtering, noise shaping or dithering. Before output, the signal is smoothed by a sweet first order low pass filter. To reach best listening quality, it can be coupled to an external low jitter clock.

High speed ICs are of the 74AC family with symmetrical output impedance and balanced propagation delay. To minimize reflection, all digital lines are loaded and PCB is 75ohm compliant. To minimize noise in power supply, critical capacitors are Wima FKP2 polypropylene film and foil. Analog section uses SCR polypropylene capacitors and Elna Silmic II electrolytic capacitor.
Power supplies in a DAC are critical to the overall design. The Jundac Two uses thirteen very low noise separate regulators. These power supplies use polypropylene capacitors and three separated power transformers.

Never a kit pushes so far music refinement. Learn more...

FEATURES
FOUR DIGITAL INPUTS S/PDIF, AES3,
DIGITAL TRANSFORMER INPUT,
RCA, BNC or XLR input connector,
ACCEPT 16, 18, 20, 24 BIT,
32K TO 192KHz,
NO OVERSAMPLING, no digital filter,
OPTIONAL CLOCK INPUT: 128FS to minimize jitter,
INCLUDE CS8416 DIR RECEIVER with digital de-emphasis,
DAC chips PCM1704
LOW NOISE REGULATORS, LT1763, LT3080,
BOARD SIZE: 305mm X 191mm

You can find a complete technical description on my web site and more pictures about this kit.

Hope you share this experience with us.
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Old 27th July 2010, 08:05 PM   #2
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Few pictures.
Attached Images
File Type: jpg jundactwo01.jpg (108.7 KB, 915 views)
File Type: jpg jundactwo02.jpg (174.7 KB, 891 views)
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Old 19th August 2010, 02:49 AM   #3
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Join Date: Jul 2004
Location: North Carolina
Quote:
Originally Posted by Eric Juaneda View Post
After three years, many prototypes and intensive listening test, I present the Jundac Two, a high-end 24bit non-oversampling digital to analog converter. It integrates four inputs: S/PDIF or AES/EBU, an optional external clock for very low jitter operation and stereo fixed analog output.

A non oversampling DAC don't use any digital filter. Data coming from CD are directly converted to analog; there is no coloratura introduced by digital filtering, noise shaping or dithering. Before output, the signal is smoothed by a sweet first order low pass filter. To reach best listening quality, it can be coupled to an external low jitter clock.

High speed ICs are of the 74AC family with symmetrical output impedance and balanced propagation delay. To minimize reflection, all digital lines are loaded and PCB is 75ohm compliant. To minimize noise in power supply, critical capacitors are Wima FKP2 polypropylene film and foil. Analog section uses SCR polypropylene capacitors and Elna Silmic II electrolytic capacitor.
Power supplies in a DAC are critical to the overall design. The Jundac Two uses thirteen very low noise separate regulators. These power supplies use polypropylene capacitors and three separated power transformers.

Never a kit pushes so far music refinement. Learn more...

FEATURES
FOUR DIGITAL INPUTS S/PDIF, AES3,
DIGITAL TRANSFORMER INPUT,
RCA, BNC or XLR input connector,
ACCEPT 16, 18, 20, 24 BIT,
32K TO 192KHz,
NO OVERSAMPLING, no digital filter,
OPTIONAL CLOCK INPUT: 128FS to minimize jitter,
INCLUDE CS8416 DIR RECEIVER with digital de-emphasis,
DAC chips PCM1704
LOW NOISE REGULATORS, LT1763, LT3080,
BOARD SIZE: 305mm X 191mm

You can find a complete technical description on my web site and more pictures about this kit.

Hope you share this experience with us.
Eric,

Welcome to DIYAudio. I find your kit well documented and your website is easy to navigate. Your instructions are also thorough. There is only one thing I would like to clarify. Does the dac cost 1100 euros/$1200 U.S.?

Thanks,
Anand.
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Old 19th August 2010, 11:12 AM   #4
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What is the cost in USD?
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Old 19th August 2010, 01:20 PM   #5
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Location: Avignon, France
Hi Anand,
Quote:
Originally Posted by nycavsr2000 View Post
Eric,

Welcome to DIYAudio. I find your kit well documented and your website is easy to navigate. Your instructions are also thorough. There is only one thing I would like to clarify. Does the dac cost 1100 euros/$1200 U.S.?

Thanks,
Anand.
Yes, the price of the DAC assembled and tested is 1100euros (1099euros exactly). This price include Paypal fee (38euros). You can save 38euros with payment by direct transfer bank. You can reduce cost if you buy more than one DAC. Don't hesitate to mail me for more information.

Don't forget to add cost for shipping transport.
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Last edited by Eric Juaneda; 19th August 2010 at 01:30 PM.
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Old 19th August 2010, 01:23 PM   #6
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Location: Avignon, France
Hi ppcblaster,
Quote:
Originally Posted by ppcblaster View Post
What is the cost in USD?
If you add DAC to the basket, I guess that Paypal basket gives an $US value?

You can delete object in basket later.
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Old 24th September 2010, 05:47 PM   #7
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The Jundac Two in a box.
Attached Images
File Type: jpg jundac2-10big.jpg (230.4 KB, 649 views)
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