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Building the ultimate NOS DAC using TDA1541A
Building the ultimate NOS DAC using TDA1541A
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Old 30th October 2006, 08:00 PM   #1081
Onnosr is offline Onnosr  Netherlands
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Default Re: It works...

Quote:
Originally posted by -ecdesigns-
Yep, it's alive, I am going to hook it up to my set immediately...

Congrats Looks VERY nice.

Onno
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Old 30th October 2006, 10:40 PM   #1082
maxlorenz is offline maxlorenz  Chile
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Hi EC,
I'm speechless because of the esthetic quality of your work, especially the innards

I have to build my own boxes
I name my gear "the Fred Flintstone line of products". That should describe how they look

A couple of things bother me:

a) Have you made test to evaluate how your different power supplies sections perform?

b) Can you remind us what is your final re-clocking strategy for I2S?

Sorry to be a P... (approaching 100K views )

Cheers,
M
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Old 31st October 2006, 05:22 AM   #1083
frippen is offline frippen  Netherlands
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Dear John,


I am also speechless about the quality of the work, the casing etc. etc. In Holland we have a saying with the right tools it is half the job ...

But you have gone far beyond the borders, and apparently spent enormous amount of time & money to produce everything down to the last detail perfect without compromises.

I am deeply impressed, Chapeau !

I am very anxious to hear about the kit prices when they are avail. I am wondering whether I should use the tda1541a, or tda1541a double crown. I have been reading about it on the internet and all very promising. But I have also seen prices of about us$90 per chip...

I presume most of you guys have 'reference' speakers and 'reference' amps to make the whole just the best. I have b&W CM6 floorstanding speakers and probably will be forced to make a good amp, currently I use a Denon4306. Heard good things about the hypex amps.

Finally, Many Thanks for letting me in on this trip and look beyond borders in DIY I thought were impossible, which revives many memories of a 16yrOld soldering my first Amp and Woodworking my first Speakers and listening to 'Crime of the Century' and feeling happy.
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Old 31st October 2006, 12:10 PM   #1084
Rembulan is offline Rembulan  Indonesia
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Default Amazing

John,
I work with electronics equipment for almost 25 years but I never see some one like you great attitude for any critics, keen in all aspect ( tubes,digital machinery) the best thing you also have a artis taste difficult combination to find, I dont care if your design do not sound like stardivari violin I will duplicate your desing any way.
Bravo......
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Old 3rd November 2006, 07:26 AM   #1085
ecdesigns is offline ecdesigns  Netherlands
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Default Power supply / (re) clocking

Hi maxlorenz,

Thanks for the compliments [post #1082]

Sorry for the delay, but I am working very hard to get both the new octal D-I DAC PCB's and housing design ready.

As for the housing, some new sketches of the octal D-I DAC and the TDA1543 based DAC housing can be found on my website, this housing has a significantly easier construction, using standard aluminum parts (less milling necessary) this makes it much more affordable, it has the same quality and appearance as the housing on the photographs.

a) Power supply performance:

Yes, the power supplies perform well. No audible hum, noise or mains interference. LM137 / 337 could be used, but requires more components as the octal D-I DAC core uses 29 fixed voltage regulators. Because each single TDA1541A and the I/V diff amp modules have individual voltage regulators, a lot of power supply related problems can be avoided.

b) Final BCK (re) clocking scheme:

The Differential I2S inputs are not reclocked. Differential interlinks with stranded twisted wire pairs up to 3 meters cause no audible signal degradation.

The source (CD player) has to provide a low jitter I2S signal. The DS8921 and DS8922 were used as they had the highest noise immunity and provided the lowest jitter at the end of the differential interlink. The octal D-I DAC can toggle between 3 digital input sources (USB included).

In order to connect SPDIF sources, or convert formats, a external universal interface module can be used. Using synchronous reclocking (if possible) can reduce jitter significantly.

The USB interface can be connected by using the maximum specified USB cable length (5m).

The USB interface I2S BCK signal is asynchronously reclocked by a shiftregister reclocker. The reclocker is driven by a 48 MHz low jitter master clock. The reclocked BCK is then buffered by a DS8921 to suppress common noise. So basically with the USB interface, the master clock is located close to the DAC chip's.

- The differential I2S signals (also the one from the USB interface) first enter the differential I2S input selector, based on the DS8922, selection is accomplished by the differential to single ended buffers that are necessary anyway. A separate chip is used for BCK to avoid crosstalk with DATA and WS.

- BCK is then buffered by 3 low skew UHS buffers (now integrated in the timing-chain), one for the timing-chain and logic, one for DAC1 and one for DAC2...8. DAC2...8 use inverted BCK as both their delayed DATA and WS now change on the positive going edge of BCK.

The new smaller timing-chain only supports Philips format. CDPRO2 output format seems to be programmable. I noticed a keyboard / display kit on the internet that provided multiple output formats using a CDPRO2.

I want to use the Philips format exclusively as this enables 32X and 64X D-I mode. This could be useful for future upgrades.

- The 8 TDA1541A chip's receive an external 176.4 KHz Dynamic Element Matching clock signal from the new timing-chain, synchronizing them, reducing interference.


Cheers,

John
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Old 3rd November 2006, 02:26 PM   #1086
maxlorenz is offline maxlorenz  Chile
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Thank you very much, John, for your reply.

Quote:
The Differential I2S inputs are not reclocked. Differential interlinks with stranded twisted wire pairs up to 3 meters cause no audible signal degradation.
I'm slow. As I understand, one has to make a differential I2S output, perhaps copying your receiver circuit (or using pulse TX's?)

Quote:
The new smaller timing-chain only supports Philips format. CDPRO2 output format seems to be programmable. I noticed a keyboard / display kit on the internet that provided multiple output formats using a CDPRO2.
I bought my CDPRO from http://www.diy-high-end.com/
Nico Thevissen, the seller, told me that my unit outputs the Phillips format. Perhaps he re-programmed it?
How can I test it? I mean before I connect it to the DI-DAC?
Any other users know?

Cheers,
M

PS: I'll check your site.
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Old 3rd November 2006, 04:21 PM   #1087
frippen is offline frippen  Netherlands
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Default CDPRO2

Hi Max,

I saw your post on the cdpro2. I also purchased a cdpro2m from nico thevissen. I was not aware of the sony output format. But some time back i read on the internet somewhere that the output format could be changed into another format. Let's see whether there are people how exactly this can be done, I am facing the same problem when building the d-i-dac. I would presume however that nico thevissen should know more about this, did you ask him already?

Rgds
Frederik
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Old 3rd November 2006, 04:30 PM   #1088
ecdesigns is offline ecdesigns  Netherlands
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Default Changing CDPRO2 output format

Hi maxlorenz,

Thanks for the compliments [post #1086]

Yes, when the octal D-I DAC is used as a external DAC, a small differential I2S driver has to be added to the CD player, but if the transport is close to the octal D-I DAC core, I2S can be connected directly (single ended). I will post a schematic diagram of the final universal I2S interface circuitry soon, I will also design a small PCB for it, so it's very easy to build. With this interface, almost every digital sound source can be connected to the octal D-I DAC. I alredy used all inputs, I2S1 for the CD changer (no it's not catching dust yet), I2S2 for my modded digital sattelite receiver (watching a movie now is like sitting in a cinema), and USB for the fanless iMac 500MHz containing my entire CD collection on a 160Gb HD.

You can connect the octal D-I DAC to the CDPRO without damaging anything if the format is wrong. If it outputs the Sony format, the sound will be very weak. The following website has more information about changing the CDPRO2 output format:

http://diyparadise.com/cdm12kit.html


Cheers,

John
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Old 3rd November 2006, 09:16 PM   #1089
maxlorenz is offline maxlorenz  Chile
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Hi Frederik,
Yes I asked him:
Quote:
The output is Philips format no oversampling.
See IC spec.
Regards,
Nico
But you are closer to him ...it doesn't hurt to ask again

Hi ecdesigns,
Thanks for your explanation.
I'm aware that it would be easier to connect directly a DI-DAC to CDPRO, through single ended I2S, as an "integrated" CD player. I'll probably do it that way, but as I said before, soon there will be 8 or 16 dac towers radiating heat

Thanks for the link.
Well, it seems that we have to study those different I2S formats to begin whith...

Best regards,
M
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Old 8th November 2006, 05:16 AM   #1090
Brent Welke is offline Brent Welke  Canada
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Default new timing chain?

Hi EC,

I am finally getting around to building your timing chain.

I am modifying my TDA1543 DAC to be an octal DAC with single passive IV stage into an OPA627 buffer. I have the timing chain built out of a tower of 16 SMD logic chips. It is the same height as a tower of 8 TDA1543 chips. Looks cool. I haven't applied power to it yet. I give it a 50/50 chance of surviving me building it. I may have cooked a couple chips in the beginning of the process. If this logic tower doesn't work, the next one will

Speaking of the timing chain you say you have a new simplified one. Do you mind me asking but are you ready to share/post it?
I am too green to have come up with your last one let alone a simplified one

Cheers,
Brent
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