Mikewong said:
I want to purchase this kit also. I'm from Turkey. Some of the parts are not available here especially TDA1541A's and that blue boxed torodial transformers.
My aunt is in Nederland now and i want to let her get these parts there. I think that tda1541a's easy to to find there then other places 🙂
May you suggest me a dealer in Netherland for ordering these parts?
At last but not least, is there any list of circuit elements which going to be used in DI8-M circuit?
Thank you.
TDA1541A internal circuit
Hi Guido,
Thanks for your tip [post #1297]
I found some more interesting threads about TDA1541A specifications. The information Mr. Henk ten Pierick gave about the TDA1541A internal circuitry was very interesting.
He advised to limit the amplitude of the TDA1541A input signals, and their bandwidth in order to avoid crosstalk / HF noise.
There seem to be 2 current sources connected in series, one 2mA bias current source connected to +5V and the reference current source with bit switches connected to -15V. The TDA1541A output is at the center of these two current sources. As I understand it, the reference current source circuit itself is powered by 10V (-15V....-5V). So interference on this 10V supply might affect current source accuracy.
Hi Guido,
Thanks for your tip [post #1297]
I found some more interesting threads about TDA1541A specifications. The information Mr. Henk ten Pierick gave about the TDA1541A internal circuitry was very interesting.
He advised to limit the amplitude of the TDA1541A input signals, and their bandwidth in order to avoid crosstalk / HF noise.
There seem to be 2 current sources connected in series, one 2mA bias current source connected to +5V and the reference current source with bit switches connected to -15V. The TDA1541A output is at the center of these two current sources. As I understand it, the reference current source circuit itself is powered by 10V (-15V....-5V). So interference on this 10V supply might affect current source accuracy.
DI DAC information / parts
Hi terranigma,
Thanks for your reply [post #1301]
After a weekend of hard work, my website is updated. The product configurator is online now. As noted, this configurator provides information about selected items, by automatically generating a complete PDF file containing all relevant information, varying from a single PCB, up to complete products. This PDF file can be emailed to place an order.
To start the product configurator, select "products", "Visit the kit product configurator".
The TDA1541A is still listed at www.elektronica-online.com.
I got the blue encapsulated torroidial transformers from both RS components and Digikey. There are different types used, depending on the DI DAC you like to build.
The DI8 uses 2X7V (15VA) and 2X18V (15VA)
Both DI8M and DI16M use 2X7V (15VA), 2X18V (15VA), 2X15V (25VA), and 2X15V (15VA).
The DI16 uses 2X18V (7VA) and 2X9V (15VA)
These transformers have 2 X 115V primary winding.
The components list, schematics, and assembly instructions will be included with the PCB sets.
Hi terranigma,
Thanks for your reply [post #1301]
After a weekend of hard work, my website is updated. The product configurator is online now. As noted, this configurator provides information about selected items, by automatically generating a complete PDF file containing all relevant information, varying from a single PCB, up to complete products. This PDF file can be emailed to place an order.
To start the product configurator, select "products", "Visit the kit product configurator".
The TDA1541A is still listed at www.elektronica-online.com.
I got the blue encapsulated torroidial transformers from both RS components and Digikey. There are different types used, depending on the DI DAC you like to build.
The DI8 uses 2X7V (15VA) and 2X18V (15VA)
Both DI8M and DI16M use 2X7V (15VA), 2X18V (15VA), 2X15V (25VA), and 2X15V (15VA).
The DI16 uses 2X18V (7VA) and 2X9V (15VA)
These transformers have 2 X 115V primary winding.
The components list, schematics, and assembly instructions will be included with the PCB sets.
wow, I'm exhausted.
Only really got up to page 38 and, being so late, just had to take a quick peek at 'how the story ends'! Good timing eh, just when the kit gets announced ha ha!!
However, my only trouble is that my system is tri-amped aarrgghh, oh well, I suppose by the end of the last one I will have gotten it right and will have at least ONE working kit!
Thanks for a beautiful looking project, even if 97.8326% of it went way over my head.
Could a reasonably intelligent primate, in monkey-see monkey-do fashion (yes, me) stand any sort of chance of successfully completing this work of art?? or would that be total wishful thinking.
Will go back and try and finish the missing pages, but until then in terms of any group buys that may have been planned earlier ( will find out when I read the missing pages I suppose) have there been any interested people in Australia??? Will throw that out there for now, see what response that might bring in this neck of the woods.
thanks all
Only really got up to page 38 and, being so late, just had to take a quick peek at 'how the story ends'! Good timing eh, just when the kit gets announced ha ha!!
However, my only trouble is that my system is tri-amped aarrgghh, oh well, I suppose by the end of the last one I will have gotten it right and will have at least ONE working kit!
Thanks for a beautiful looking project, even if 97.8326% of it went way over my head.
Could a reasonably intelligent primate, in monkey-see monkey-do fashion (yes, me) stand any sort of chance of successfully completing this work of art?? or would that be total wishful thinking.
Will go back and try and finish the missing pages, but until then in terms of any group buys that may have been planned earlier ( will find out when I read the missing pages I suppose) have there been any interested people in Australia??? Will throw that out there for now, see what response that might bring in this neck of the woods.
thanks all
Great news, EC!
I went to your site and the info is very clear 🙂 very easy to navigate.
I'll study your offers/options, though I'm sure I will find them too expensive for a third world DIYer 😀
Cheers,
M
I went to your site and the info is very clear 🙂 very easy to navigate.
I'll study your offers/options, though I'm sure I will find them too expensive for a third world DIYer 😀
Cheers,
M
Re: DI2S interface schematics
Is this universal I2S interface part of the USBDI2S board or something else? I will be getting I2S from a sound card and not using USB and I will have a master clock.
Do I still need the USBDI2S board?
-ecdesigns- said:
Is this universal I2S interface part of the USBDI2S board or something else? I will be getting I2S from a sound card and not using USB and I will have a master clock.
Do I still need the USBDI2S board?
Hi agent.5
Thanks for your reply [post #1306],
The universal I2S interface is a separate external module, it should be located close to the digital sound source (transport) to keep the SPDIF interlink as short as possible, and to enable synchronous reclocking with a masterclock (if possible).
If the sound-card can be configured to output the Philips format, needed for the DI DAC:
BCK: 2.8224 MHz, WS: 44.1 KHz, time multiplexed mode (I2S), two's complement.
It's possible to drop the USB/DI2S interface. However, you will need to add a DI2S buffer to the soundcard's I2S outputs:
BCK > BCK+ and BCK-
WS > WS+ and WS-
DATA > DATA+ and DATA-
and a DI2S receiver buffer at the DI DAC I2S input:
BCK+ and BCK- > BCK
WS+ and WS- > WS
DATA+ and DATA- > DATA
The derived I2S signals (BCK, WS and DATA) can now be connected directly to the DI 8 core.
The master clock from the soundcard could be used for synchronous reclocking.
You could use high-quality (screened) twisted pair networking cable for the DI2S interlink, these have 4 twisted-pairs. Make sure to apply the correct loading (100...120 Ohms resistor on the DI2S receiver inputs).
Also make sure to use separate DI2S buffer chips (DS8921) for BCK only, never mix both DATA and BCK signals in the same chip (crosstalk).
Thanks for your reply [post #1306],
The universal I2S interface is a separate external module, it should be located close to the digital sound source (transport) to keep the SPDIF interlink as short as possible, and to enable synchronous reclocking with a masterclock (if possible).
If the sound-card can be configured to output the Philips format, needed for the DI DAC:
BCK: 2.8224 MHz, WS: 44.1 KHz, time multiplexed mode (I2S), two's complement.
It's possible to drop the USB/DI2S interface. However, you will need to add a DI2S buffer to the soundcard's I2S outputs:
BCK > BCK+ and BCK-
WS > WS+ and WS-
DATA > DATA+ and DATA-
and a DI2S receiver buffer at the DI DAC I2S input:
BCK+ and BCK- > BCK
WS+ and WS- > WS
DATA+ and DATA- > DATA
The derived I2S signals (BCK, WS and DATA) can now be connected directly to the DI 8 core.
The master clock from the soundcard could be used for synchronous reclocking.
You could use high-quality (screened) twisted pair networking cable for the DI2S interlink, these have 4 twisted-pairs. Make sure to apply the correct loading (100...120 Ohms resistor on the DI2S receiver inputs).
Also make sure to use separate DI2S buffer chips (DS8921) for BCK only, never mix both DATA and BCK signals in the same chip (crosstalk).
Thanks for your reply. I guess I will need to order this "universal I2S interface" from you. And I have no clue what I2S format Audiotrak Prodigy 7.1 outputs; so there will be some experimentations.
Just a request: this has been a long thread and I am wondering if you can post all the final schematics of all the different modules in one place?
Just a request: this has been a long thread and I am wondering if you can post all the final schematics of all the different modules in one place?
This is not a criticism but I also found the prices expensive for an average diyer.
The price /performance ratio may well be worth it but not having listened to these dacs I would personally wait until a few more adventurous people gave some feedback compared to some high end or NOS dacs.
If the results are very positive I would seriously consider it.Otherwise it is too much money to experiment with.
The price /performance ratio may well be worth it but not having listened to these dacs I would personally wait until a few more adventurous people gave some feedback compared to some high end or NOS dacs.
If the results are very positive I would seriously consider it.Otherwise it is too much money to experiment with.
Hi agent.5
Thanks for your reply [post #1308],
If I am correct the Audiotrak Prodigy 7.1 has both a SPDIF digital output, and input. I couldn't find any information about a separate master clock output.
So when using the Universal I2S interface, it should work fine with 44.1 KHz / 16 bit setting. The Universal I2S interface will provide format conversion. The Universal I2S interface reclocks BCK with a shiftregister reclocker and converts I2S to DI2S.
However, using the USB/DI2S interface should provide slightly better performance, because the reclocker is now located much closer to the DI 8 core.
Thanks for your reply [post #1308],
If I am correct the Audiotrak Prodigy 7.1 has both a SPDIF digital output, and input. I couldn't find any information about a separate master clock output.
So when using the Universal I2S interface, it should work fine with 44.1 KHz / 16 bit setting. The Universal I2S interface will provide format conversion. The Universal I2S interface reclocks BCK with a shiftregister reclocker and converts I2S to DI2S.
However, using the USB/DI2S interface should provide slightly better performance, because the reclocker is now located much closer to the DI 8 core.
-ecdesigns- said:
well. Audiotrak will be modded to get 6 channels of I2S out. I will have a master clock feeding the Audiotrak and all the DACs. Credit goes to Vil.
http://www.diyaudio.com/forums/showthread.php?postid=742837#post742837
Will the USB/DI2S interface accept world clock input, as I need to sync multiple DACs (maybe a DI8 for full range and a DI16 for bass)?
EC,
I would go timidly with a "PCB only" project.
Two questions:
1) Will your PCB's come with a complete parts list?
2) Will you accept Paypal or credit cards?
Thanks,
M
I would go timidly with a "PCB only" project.
Two questions:
1) Will your PCB's come with a complete parts list?
2) Will you accept Paypal or credit cards?
Thanks,
M
-ecdesigns- said:
Don't mind me asking some dummy question as I don't know much about electronic.
From how I read above, I can connect the I2S out from the Philip CD Pro2 CD transport directly to your USBDI2S modules, is that right?
The SPDIF you list above, it is the same format as those from the commecial CD/DVD player? Will be good if this can be an universal DAC.
Have fun,
Sam
Hi maxlorenz,
Thanks for your reply [post #1313]
1) yes, the PCBs come with schematics, a complete part-list, and assembly / test instructions.
I also plan to provide a lot of additional information about the DI DACs on my website.
2) I will accept both paypal and moneybookers (www.moneybookers.com)
Thanks for your reply [post #1313]
1) yes, the PCBs come with schematics, a complete part-list, and assembly / test instructions.
I also plan to provide a lot of additional information about the DI DACs on my website.
2) I will accept both paypal and moneybookers (www.moneybookers.com)
Hi SamL,
Thanks for your reply [post #1314]
No the CDPROII outputs 48BCK/frame instead of the required 64BCK/frame, this will prevent correct timing-chain operation.
The DI DACs use differential I2S signals (less crosstalk / interlink jitter), so the CDPROII I2S output needs to be buffered by differential buffers (DS8921 / DS8922).
One option is to use the universal I2S interface, it needs the CDPROII SPDIF output and master clock. The universal I2S interface connects directly to the DI DACs as it has integrated DI2S buffers.
The universal I2S interface works with most SPDIF sources like DVD players, satellite receivers and sound-cards. If no master clock is available, the integrated shiftregister reclocker can be enabled. I use a universal I2S interface to connect both my Sony CD changer and satellite receiver to the DI 8M.
The easiest way is to use a computer-based digital sound source (mac or Linux), driving the DI DAC trough USB.
For me personally Windoze is not the best choice for digital audio applications. The latest attempt to improve it, resulted in "more of the same".
I am using the iMac music player for quite some time now, and I don't think I will use a CD transport very often anymore. I am more than satisfied with the produced sound quality, and the easy to use user-interface.
During storage of original CD images I noticed how many scratches and other damage was present on the CD surfaces, this is going to produce read errors on a CD transport one way or the other. And I also doubt if a frequently used, carefully handled CD, will remain completely free of scratches (errors).
These errors will be "corrected" but I have doubts if this isn't going to be audible. With some CD's, even CD paranoia mode couldn't correctly extract the CD data, and drop-outs occurred, making the CD no longer unusable.
When I buy a new CD now, first thing I do is making a CD image of it in iTunes, while the CD surface is still free of scratches. Then I put it safely away to avoid any further damage.
Thanks for your reply [post #1314]
No the CDPROII outputs 48BCK/frame instead of the required 64BCK/frame, this will prevent correct timing-chain operation.
The DI DACs use differential I2S signals (less crosstalk / interlink jitter), so the CDPROII I2S output needs to be buffered by differential buffers (DS8921 / DS8922).
One option is to use the universal I2S interface, it needs the CDPROII SPDIF output and master clock. The universal I2S interface connects directly to the DI DACs as it has integrated DI2S buffers.
The universal I2S interface works with most SPDIF sources like DVD players, satellite receivers and sound-cards. If no master clock is available, the integrated shiftregister reclocker can be enabled. I use a universal I2S interface to connect both my Sony CD changer and satellite receiver to the DI 8M.
The easiest way is to use a computer-based digital sound source (mac or Linux), driving the DI DAC trough USB.
For me personally Windoze is not the best choice for digital audio applications. The latest attempt to improve it, resulted in "more of the same".
I am using the iMac music player for quite some time now, and I don't think I will use a CD transport very often anymore. I am more than satisfied with the produced sound quality, and the easy to use user-interface.
During storage of original CD images I noticed how many scratches and other damage was present on the CD surfaces, this is going to produce read errors on a CD transport one way or the other. And I also doubt if a frequently used, carefully handled CD, will remain completely free of scratches (errors).
These errors will be "corrected" but I have doubts if this isn't going to be audible. With some CD's, even CD paranoia mode couldn't correctly extract the CD data, and drop-outs occurred, making the CD no longer unusable.
When I buy a new CD now, first thing I do is making a CD image of it in iTunes, while the CD surface is still free of scratches. Then I put it safely away to avoid any further damage.
Hi EC,
Thanks for your reply (post # 1315).
A doubt aroused:
Do the DI-16 core use I2S or DI2S signal?
I was under the impresion that the USB/DI2S receiver converted signal to simple I2S. Am I wrong?
Regards,
M
Thanks for your reply (post # 1315).
A doubt aroused:
Do the DI-16 core use I2S or DI2S signal?
I was under the impresion that the USB/DI2S receiver converted signal to simple I2S. Am I wrong?
Regards,
M
Hi EC
I downloaded that PDF from Your Website but can`t open it. That`s not a normal PDF ,how can I open it?
Regards DT
I downloaded that PDF from Your Website but can`t open it. That`s not a normal PDF ,how can I open it?
Regards DT
Hi maxlorenz,
Thanks for your reply [post #1317]
Yes, the USB/DI2S receiver only converts the DI2S input to I2S. That's correct.
The universal I2S interface connects to a SPDIF source (input) and outputs DI2S in the Philips format 64BCK/frame (conversion is done by the CS8416). This DI2S output from the universal I2S interface can now be connected to the DI DAC DI2S input, or directly to the DI core using a DS8921 and DS8922 differential transceiver (receiver part is used for this), in this case the USB/DI2S module is not needed.
Thanks for your reply [post #1317]
Yes, the USB/DI2S receiver only converts the DI2S input to I2S. That's correct.
The universal I2S interface connects to a SPDIF source (input) and outputs DI2S in the Philips format 64BCK/frame (conversion is done by the CS8416). This DI2S output from the universal I2S interface can now be connected to the DI DAC DI2S input, or directly to the DI core using a DS8921 and DS8922 differential transceiver (receiver part is used for this), in this case the USB/DI2S module is not needed.