"Reference" TDA1541A DAC with I2S-BUS architecture - Page 45 - diyAudio
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Old 30th December 2010, 11:08 AM   #441
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Old 31st December 2010, 02:42 AM   #442
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Hi, I got my working today, I'm struggling with DEM re-clocking, it takes few seconds to sync. I'm playing with different frequency, right now I'm using MCLK/2. Buffer for amb USB-to-IS converter works well, thanks for that. Sound is very good, even with out SSHV. I'm going to build it in few days. For IV R I went with 56ohm and later 47ohm I will test more and then buy better quality R.
What can I say, sound is very good, I'm using this DAC with Beta22 headphone amp. Here few shots,

Thanks
Attached Images
File Type: jpg dac_full.jpg (650.6 KB, 469 views)
File Type: jpg dac_only.jpg (633.7 KB, 446 views)
File Type: jpg usb.jpg (624.0 KB, 424 views)
File Type: jpg beta22.jpg (656.4 KB, 404 views)
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Old 31st December 2010, 09:48 AM   #443
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Chapeau!

Looks great! What a pity that the PCM2707 only support up to 48KHz from the USB side.
Perhaps you will change that later.
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Old 2nd January 2011, 11:15 AM   #444
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Exclamation Revised BOM Excel File

A Happy new year to everyone

In the attached file, you find the revised BOM from Ryelands
including all parts cost in USD.

Attached Files
File Type: zip TDA1541A Project - BOM - Final.xls.zip (8.0 KB, 82 views)
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Old 3rd January 2011, 09:34 AM   #445
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Old 3rd January 2011, 05:47 PM   #446
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Hi

Having spent the festive break reading through the thread a few times I would like to make the following observations / suggests / questions.

1. If I build the boards (psu / salas shunts / dac) as per the diagrams and BOM then I should have a working DAC.

2. If the I2S source does not have a buffer then I need the new high-speed buffer board (at the moment I am sucessfully running I2s from a QA-550 into Buffalo 32S and from a juli@ into Buffalo II - since neither of these dacs seems to have a buffered input I assume there should not be a problem with the TDA1541A board!!).

3. It would be better to remove the TL431s and associated circuitry; in this case it would seem to be better to chop the board removing the TL431 section and wiring the Salas shunts as close as possible to the TDA1541A - a possible future version of the boards could have 3 parts for the DAC board - input psu connections board / TL431 board / DAC board? The Salas shunt boards could also have the outputs aligned to the DAC board allowing for even shorted connections?

4. Having a v2.3 board I do not have to lift any feet on the 74HC02.

5. Worry about the appropriate IV stage later!

If the above is correct then I will order all the bits (excluding TL431 bits) as per Ryelands excellent spreadsheet and get building.

Regards

Alan
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Old 4th January 2011, 05:08 AM   #447
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Old 4th January 2011, 05:36 AM   #448
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Hi Alon,

to your questions:

Quote:
1. If I build the boards (psu / salas shunts / dac) as per the diagrams and BOM then I should have a working DAC.
You still need an output stage.

Quote:
2. If the I2S source does not have a buffer then I need the new high-speed buffer board (at the moment I am sucessfully running I2s from a QA-550 into Buffalo 32S and from a juli@ into Buffalo II - since neither of these dacs seems to have a buffered input I assume there should not be a problem with the TDA1541A board!!).
Unfortunately i dont know the two I2S devices.
As i wrote before, if your I2S devices supply voltages equals 3.3V and dont have a buffer IC on board,
you would need one, e.g. my Ultra High Speed Buffer Module.
The I2S attenuators from ecdesigns i am using on my DAC module, are designed for 5V TTL levels only.
So we need the buffer between the output of these 3.3V devices and the input of my DAC module
for a proper work, without canceling the advantages of the I2S attenuators.

Quote:
3. It would be better to remove the TL431s and associated circuitry; in this case it would seem to be better to chop the board removing the TL431 section and wiring the Salas shunts as close as possible to the TDA1541A - a possible future version of the boards could have 3 parts for the DAC board - input psu connections board / TL431 board / DAC board? The Salas shunt boards could also have the outputs aligned to the DAC board allowing for even shorted connections?
The main advantage of my DAC project is the modular design.
For those who could not or dont want use the HighEnd Salas Shunt Modules,
the additional TL431 are still on the DAC module for best voltage regulation.

I think Lucas had connected the Salas Shunts directly to the DAC Module. If he is ready with his soundcheck, i hope he post his experiences.

A new revision with a separate TL431 board is not planned.

Quote:
4. Having a v2.3 board I do not have to lift any feet on the 74HC02.
Correct.


Best regards,
Oliver
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Old 4th January 2011, 07:31 AM   #449
noizas is offline noizas  Lithuania
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Hello Oliver

all ordered PCBs, including Ultra High Speed Buffer Modules, received.
Thank you very much.

Now will start with building.

Can you say that is best solution to solder those pcbs covered by gold with eutectic solder?
Almost all other producers of diy pcb, uses non gold immersion, because gold is ok for contacts, not for soldering.

Here is John Broskie opinion:

"If any of the parts have gold-plated leads, remove the gold flash before soldering the part, as only a few molecules of gold will poison a solder joint, making it brittle; use sandpaper, steel wool, or a solder pot.
NASA forbids any gold-contaminated solder joints; you should as well. (Yes, there are many quality parts with gold-flashed leads, but the use of gold is a marketing gimmick, not sound electrical engineering practice.)"

I use Cardas quad eutectic solder, but I have no solder pot for such big PCB. On other hand I can not use sandpaper or steel wool for removing gold from PCB.

Please advice

Saulius
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Old 4th January 2011, 08:47 AM   #450
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Quote:
Originally Posted by noizas View Post
Hello Oliver

all ordered PCBs, including Ultra High Speed Buffer Modules, received.
Thank you very much.

Now will start with building.

Can you say that is best solution to solder those pcbs covered by gold with eutectic solder?
Almost all other producers of diy pcb, uses non gold immersion, because gold is ok for contacts, not for soldering.

Here is John Broskie opinion:

"If any of the parts have gold-plated leads, remove the gold flash before soldering the part, as only a few molecules of gold will poison a solder joint, making it brittle; use sandpaper, steel wool, or a solder pot.
NASA forbids any gold-contaminated solder joints; you should as well. (Yes, there are many quality parts with gold-flashed leads, but the use of gold is a marketing gimmick, not sound electrical engineering practice.)"

I use Cardas quad eutectic solder, but I have no solder pot for such big PCB. On other hand I can not use sandpaper or steel wool for removing gold from PCB.

Please advice

Saulius
Hi Saulius,

first a happy new year to you

Dont be afraid of any solder problems. You colud use any lead and lead free solder you want.
I for myself use normal leaded 60/40 solder and Mundorf MSolder silver/gold.

BTW, all my modules are designed to play not in orbit.
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