"Reference" TDA1541A DAC with I2S-BUS architecture - Page 37 - diyAudio
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Old 1st December 2010, 11:20 AM   #361
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Default DD's USB2I2S

Quote:
Originally Posted by Ryelands View Post
Having one or two TDA1541As to hand, I bought some of Oliver's PCBs with a view to finishing off projects that had, well, taken a lengthy break . . .

I've just finished the first which uses a "crownless" 1541A chip and PSUs based on LM317s and 7805s in a Cascode arrangement (not the usual double regulator bodge) that I bought in kit form about ten years ago but never used. Input is via one of DD's USB to I2S modules and the I/V stage uses a couple of Sowter 8347 transformers that did duty for years in an upgraded CD player. Though it cost only buttons, it sounds rather good.

However, to get it to work I had to remove pull-up and pull-down resistors R28 and R31 in the BCK line. Until I did that, no sound at all.

Has anyone else tried DD's module in this application? If so, did you have the same trouble or have I done something wrong?

OTOH, if anyone does try the module and gets no sound, this might be worth a try.

Dave
Hi Dave,

I am facing this issue as well! Tried it later with DD's SPDIF input board, and it worked. Thats why I thought I had killed the USB board doing some earlier mods. So this would be good news if I was wrong. I'll give it a try later. Thanks for posting this.

Regards Ernst
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Old 1st December 2010, 02:06 PM   #362
Malka07 is offline Malka07  England
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Hi Dave and Ernst,

Im not sure if your aware of this thread here...
Twisted Pear S/PDIF WM8804 Transceiver Module on TDA1541A problem

But i use a Twisted Pair Spdif tranceiver and have the no sound or distorted sound problem...another member who uses the Y1 USB-to-IS converter is having the same problem...Oliver has found that both these board lack the BUS Buffer (74HC125) between the converter IC and the I2S output...that his Teralink x2 has and which works with the dac.

Maybe the DD Board also lacks this? If this indeed is the problem??

Alon
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Old 1st December 2010, 02:37 PM   #363
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Maybe the DD Board also lacks this?

Thanks for that - I forget where I read what that gave me the idea of removing the resistors - on this forum somewhere but not there. Whatever, I'm running now.

DD's USB-to-I2S module uses the PCM2707 which drives the I2B bus directly. I've been happily using one to drive three 12-way TDA1543 "towers" for a couple of years so to say it "lacks" the buffer might not be quite correct: it doesn't need a buffer. OTOH, it's limited to 48HKz.

If the same mod gets Ernst's board going, it would seem we're getting somewhere. Watch this space . . .

Dave
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Old 1st December 2010, 04:09 PM   #364
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Default Buffer

The buffer in Doedes case was/is located on the DD TDA1543x12 board. Somewhere in my chaos it must be around. I already pulled all usable items but not the buffer. I'll try this, but will take some time after I decided to modify the ECDesign I/V to MK5. DDs SPDIF input board is working without the buffer inbetween. Seems that the PCM2707 I2S output voltage swing is too small for further attenuating....
Yes just had a look, the 74VHC125N is on the towerboard. I'll separate this part of the board and use it for this new purpose. Good to know.

Cheers Ernst
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Old 1st December 2010, 04:21 PM   #365
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I have the separate DD SPDIF board (no optional USB board) and it does include the 74VHC4040M. Strange that this is a different setup than the integrated converted board
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Old 1st December 2010, 04:49 PM   #366
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This is Doedes normal setup. On the SPDIF inputboard there is this 7404 bug. This is used for reclocking, if I am not wrong.

Ernst
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Old 2nd December 2010, 06:10 AM   #367
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Quote:
Originally Posted by LucasAdamson View Post
So, we can call this DAC a new type, I think:

SOS - Slightly Over Sampling. He he
Hi Lucas,

a bit OT but for us as Mac users, did you know and tried THIS nice software?
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Old 2nd December 2010, 05:24 PM   #368
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Lucas,

install the software and use the following settings:

1st set the X2 in the Audio-Midi-Setup to 96 Khz / 16Bit

- activate "Memory Play"
- activate the upsampler

Now the songs from iTunes were:

1st load into the RAM (no disturbances from the HD)
2nd upsampled to 96KHZ (max. possible for the X2)

And the sound.... UNBELIEVABLE You must try it yourself.
I guess you would hear your complete library again over the weekend
I purchase the SW definitely before the trial is running out!
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Old 2nd December 2010, 05:57 PM   #369
toufu is offline toufu  United States
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Which SPDIF solution is the most space efficient? I don't have much space left in my chassis. Thanks.
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Old 6th December 2010, 12:11 AM   #370
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Quote:
Originally Posted by dvb-projekt View Post
Lucas,

install the software and use the following settings:

1st set the X2 in the Audio-Midi-Setup to 96 Khz / 16Bit

- activate "Memory Play"
- activate the upsampler

Now the songs from iTunes were:

1st load into the RAM (no disturbances from the HD)
2nd upsampled to 96KHZ (max. possible for the X2)

And the sound.... UNBELIEVABLE You must try it yourself.
I guess you would hear your complete library again over the weekend
I purchase the SW definitely before the trial is running out!
I can't afford it but I will try it out sometime. Thanks for the suggestion Oliver.
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