A friend have read this:
A Transport of Delight: CD Transport Jitter | Stereophile.com
He use a MICROMEGA SOLO only as transport (from first editions) and two DACs - a diy DAC on Burr Brown's PCM63 Demo Board - go to
B-B PCM63 Demo Board as DAC...any Mods?
and a Pass "D1" clone" similar to this:
PASS Labs - D1 - Familie Witt
very special here is the I/U converter
D1 IV Mosfet
sound quality is approximately on the same level (not on the same character) than Ultra Analog' D20400.
Passlabs D1 (PCM63) vs. Threshold DAC-2 (Ultra Analog D20400a) - who have heard both?
Currently operates the transport in standard configuration; i. e. SAA7310/PCF3523 in the PCM decoder and S/P-DIF transmitter section - go to
https://datasheetspdf.com/pdf-file/274390/NXP/SAA7310/1
and post #11 under
Help me I need MAB8441 PCF3523 PCF2705 DataSheets
for block diagram.
The currently equipped master clock (genuine equipment) consist only of the integrated oscillator from SAA7310 so as the crystal-quarz (X-TAL) with 11.2896 MHz.
The outdoor D/A converter works with DAC PCM63P,-K (2x) DF1700 and S/P-DIF Receiver
CS8412, go to
http://phonoclone.com/pdf/cs8411.pdf
and a second device on Burr Brown's demo board with Yamaha's YM3623 - go to
https://pdf1.alldatasheet.com/datasheet-pdf/view/103367/ETC/YM3623B.html
Both SPDIF receiver IC haven't own master clock and works with the integrated clock recovery.
Follow options are comes in mind for jitter reducing steps:
1) Adding of master clock unit in the CD-transport as replacement for the presently quarz generator, e. g. LClock "XO" from LC Audio - go for images and schematic to post #8 under
Clock Generator for Cambridge Audio DISCMAGIC1/CDT - Adjustment Instruction for VR1 ?
This is the first version of
https://www.lcaudio.com/index.php?page=4
2) Adding of same master clock unit in the DAC (at DF1700 X-TAL input) as replacement for the presently used integrated clock recovery (i. e. master mode operation with additional coax connector on the CD-transport and additional coax lead therefore) This eliminates data-related clock jitter. Was realized on Linn's DAC "NUMERIK" - go to
https://docs.linn.co.uk/wiki/images/c/cd/Karik_numerik_user_manual.pdf
3) same as before (like No 2) but include reclocking BCK and WCK going to PCM63 with help of an appropriate circuit extension - go to
Reclocking balanced PCM63
If a master clock frequency of 16,9344 MHz in the DAC is necessary, also a conversion circuit (PLL) to 11,8296 MHz is necessary for the Philips based chip-set (SAA7310/PCF3523) in the transport, or 33,8688 MHz clock with a 1/2 and 1/3 clock divider circuits - go to
https://www.lcaudio.com/index.php?page=4
and
https://www.lcaudio.com/index.php?page=38
Maybe there are other resp. further options.
Thank you very much for advices
A Transport of Delight: CD Transport Jitter | Stereophile.com
He use a MICROMEGA SOLO only as transport (from first editions) and two DACs - a diy DAC on Burr Brown's PCM63 Demo Board - go to
B-B PCM63 Demo Board as DAC...any Mods?
and a Pass "D1" clone" similar to this:
PASS Labs - D1 - Familie Witt
very special here is the I/U converter
D1 IV Mosfet
sound quality is approximately on the same level (not on the same character) than Ultra Analog' D20400.
Passlabs D1 (PCM63) vs. Threshold DAC-2 (Ultra Analog D20400a) - who have heard both?
Currently operates the transport in standard configuration; i. e. SAA7310/PCF3523 in the PCM decoder and S/P-DIF transmitter section - go to
https://datasheetspdf.com/pdf-file/274390/NXP/SAA7310/1
and post #11 under
Help me I need MAB8441 PCF3523 PCF2705 DataSheets
for block diagram.
The currently equipped master clock (genuine equipment) consist only of the integrated oscillator from SAA7310 so as the crystal-quarz (X-TAL) with 11.2896 MHz.
The outdoor D/A converter works with DAC PCM63P,-K (2x) DF1700 and S/P-DIF Receiver
CS8412, go to
http://phonoclone.com/pdf/cs8411.pdf
and a second device on Burr Brown's demo board with Yamaha's YM3623 - go to
https://pdf1.alldatasheet.com/datasheet-pdf/view/103367/ETC/YM3623B.html
Both SPDIF receiver IC haven't own master clock and works with the integrated clock recovery.
Follow options are comes in mind for jitter reducing steps:
1) Adding of master clock unit in the CD-transport as replacement for the presently quarz generator, e. g. LClock "XO" from LC Audio - go for images and schematic to post #8 under
Clock Generator for Cambridge Audio DISCMAGIC1/CDT - Adjustment Instruction for VR1 ?
This is the first version of
https://www.lcaudio.com/index.php?page=4
2) Adding of same master clock unit in the DAC (at DF1700 X-TAL input) as replacement for the presently used integrated clock recovery (i. e. master mode operation with additional coax connector on the CD-transport and additional coax lead therefore) This eliminates data-related clock jitter. Was realized on Linn's DAC "NUMERIK" - go to
https://docs.linn.co.uk/wiki/images/c/cd/Karik_numerik_user_manual.pdf
3) same as before (like No 2) but include reclocking BCK and WCK going to PCM63 with help of an appropriate circuit extension - go to
Reclocking balanced PCM63
If a master clock frequency of 16,9344 MHz in the DAC is necessary, also a conversion circuit (PLL) to 11,8296 MHz is necessary for the Philips based chip-set (SAA7310/PCF3523) in the transport, or 33,8688 MHz clock with a 1/2 and 1/3 clock divider circuits - go to
https://www.lcaudio.com/index.php?page=4
and
https://www.lcaudio.com/index.php?page=38
Maybe there are other resp. further options.
Thank you very much for advices
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Best way to get rid of CD transport jitter is to rip wav files to somewhere and then use asynchronous USB to read the data using the master clock of the player. Also, if multiple clock frequencies are needed, better to avoid any PLLs if possible. Clock dividing is usually much easier to do well than is clock frequency multiplication. However, higher frequency clocks tend to have more close-in phase noise. So, perhaps the best way would be to start with a low frequency crystal oscillator, very carefully multiply it up to the minimum master clock frequency needed for the system, then divide down as needed to provide the necessary clock rates for different subsystems.
That said, doing everything as well as possible can get rather complex and expensive. Simple things that may help might include a better crystal clock, better power supplies and bypassing for clock generation and clocked devices, and careful assessment of clock signal routing and or for any clock buffering and or for proper transmission line termination.
In other words, there are lots of possibilities.
That said, doing everything as well as possible can get rather complex and expensive. Simple things that may help might include a better crystal clock, better power supplies and bypassing for clock generation and clocked devices, and careful assessment of clock signal routing and or for any clock buffering and or for proper transmission line termination.
In other words, there are lots of possibilities.
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