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Old 2nd March 2003, 07:41 AM   #211
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Quote:
Originally posted by Peter Daniel


Did you try other regulators. Some people commented that jung regulators not always sound the best with certain digital circuits.

well no, i didn't try other regs.
as far as i'm concerned, the jung reg. are "worldclass" and they will do a much better job compared to all other chipregs.....!
but perhaps a fully discrete reg will be even better, i don't know.

perhaps i shouldn't have mentioned that i had such supply pcb.
because of the cost and that it is fairly sophisticated, i have decided not to offer it for sale.
those who know those jung regs also know that they can be a bit tricky to work with, and there is also lots of very expensive components on the pcb.
in the end the complete supply for the cdpro2 will cost more than the drive itself.......i don't think that any one is prepared to pay that much....but i could be wrong...?

BUT .... i could design a specific supplyboard for the cdpro2, using only standard components like lm317/337 regs and panasonic fc ....etc.
i was thinkin' of contactin' mr. thevissen and suggest that this supply could be available from his website.....?

troels
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Old 2nd March 2003, 02:58 PM   #212
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If those Jung regulators cost more than the drive itself, I wonder how many you are using, unless you are charging an arm and leg for assembly job.

This a board made by ALW and posted somwhere on a forum.
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Old 2nd March 2003, 05:22 PM   #213
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my cdpro2 supply pcb consist of two jung regs. (ad797 and lm 329 + many other components - look at the photo from alw) + 3 x 317/337 regs. there are 4 full bridge rectifiers (IR 31dq10)
2 expensive common mode chokes + 4 encapsulated talema trafoes.........and do you know how much it cost to manufacture a fr4 double layer, 7oMu copper, 1,5 mm - fully proffesional pcb ?
and it took me a lot of time too.......!

.........the trafoes alone costs more than 150 euro, please ask alw about his price for the regs he is designing...and let us know.

i'll see if i can get a digital camera, then you'll see + i have other nice things too!!!!!!!!!
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Old 2nd March 2003, 05:27 PM   #214
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btw these are my favorit rectifiers.....

http://www.schuro.de/Daten/IR/31dq10.pdf

http://www.schuro.de/Daten/IR/hfa08tb60.pdf

http://www.schuro.de/Daten/IR/hfa25pb60.pdf


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Old 2nd March 2003, 06:04 PM   #215
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Which parts of CD-Pro are powered by Jung reg. I thought it's hard to get them working with 5V.
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Old 2nd March 2003, 06:40 PM   #216
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well, it depends on the voltage reference.
the 9 volts use the lm329 and the 5 volt use the ? (can't remember) 2,5 Vref, i would have used the ad780 but i made a mistake and didn't bother.......perhaps i'll change it .....!
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Old 17th March 2003, 06:54 PM   #217
Raj1 is offline Raj1  United Kingdom
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Default 12s or spdif

Hi,

my project for the cd-pro 2 is underway (power supplies), I'm having a bit of a problem deciding on the 12s connection though. There doesn't seem to be many dac kits that support this directly. I contacted jocko homo about his dac which does support 12s, however jocko said he wouldn't make any more boards unless there was enough demand. What are the problems that could be encountered when using this type of connection, and are there any dac kits around that are configured to counteract these issues? I'd really like to use the best connection possible and 12s does seem theoretically superior to spdif. If I use a spdif connection I'm being compelled towards the broadhurst dac, with this I'd assume that it would be best mounted within the enclosure for the
transport and as close to it as possible in order to keep the digital cable length short and reduce jitter.

Also the standard audio outputs on the transport pcb, what is the voltage output? Could these be connected directly to rca jack's and connected to a preamp?

Thanks
Raj
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Old 25th May 2003, 08:42 AM   #218
TimSr is offline TimSr  Australia
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Hi

Can anyone comment on this piece of advise from the daisy-laser web site ( http://www.daisy-laser.nl/homeoptics/page34.html ) on the CDPRO2 I2S output?

"The I2S output is there to allow direct input for DAC's or processors making use of the signals as offered at the I2S output. There is no system clock provided for external DAC's.
The wire length should be below 20 cm for the best results."

"The I2S bus was designed for Inter IC Signal exchange and not for signal exchange between 2 boxes. For external DAC's or DAC's in a second box best is to use the EBU/Spdiff output with twisted wires"

Does this mean the I2S output cannot be used with an external DAC i.e. Perpetual Technologies gear?

Thanks

Tim
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Old 25th May 2003, 11:30 AM   #219
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Lightbulb I2s

Hi Tim,
Currently I have a length of about 40 cm for the three I2S signals going from the transport to my DAC (TDA1543 NON-OS).
Kal Rubinson wrote a nice article in Audioelectronics 1, 1997 : "Get on the Bus". Backissues available from www.audioxpress.com
Maybe it is better to "sharpen up" the signals at the DAC end and/or using some form of outputbuffer.
Anyone has a idea how Audio Alchemy did it or ...........P-1A. Sorry forgot the full name
Audio Alchemy I2S mini-din pinout
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Old 25th May 2003, 05:43 PM   #220
Peter K is offline Peter K  Netherlands
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Hi Tim,

I am currently using the I2S CDPRO2 output as follows:

From the connector of the CDPRO2 to the output connector (6 pins DIN) on the DIY CDPRO2 enclosure I have used approx 15 cm CAT5 UPT cable.
From the 6 pins DIN connector to the DAC (2 x TDA1543) I use 50 cm CAT5 UPT.

Per signal I have used 1 twisted pair. One for the actual signal and one for the ground. The grounds are connected together on the DAC ground and the I2S CDPRO2 ground.

I am not sure if this is the way to do this, however it works since the first time I tested this.
------------------

I would be interested in some comments on this! Do I hurt my signal?

Best regards,

Peter
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