DIY input stages kits for TDA1541 understanding for non specialists

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AudioLapDance

Member
Joined 2003
Eldam said:
@ AUdiolapdance and simultanous mode sourcers for the TDA1541

I had a kind answer from Lyuben of JLSounds this morning who take time to answer me during him off days (summer holiday here in Europe). They will try with Joro to think about an alternative for the TDA1541 with their all in one USB to PCM board. But this is with no guaranty as they need a FLPG for that and a sever redesign: they should try maybe an alternative...
Click to expand...

Here's what I got:

Hi Jeff,

I'll tell to Joro to help with the things in diyaudio :) He can help at the weekend

Have you tested your product with the 1541 simultaneous mode?

Yes, but with the current firmware 1541 can't work in simultaneous mode only if the 1541 is configured for I2S input (tested up to 384kHz).

Today I spoke with Joro about the simultaneous mode and he told me that with an external CPLD this can be done, but he will try to think of something without the CPLD.

Maybe in two weeks we will have some answers.

Kind regards,
Lyuben
 
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Eldam

Banned
Joined 2012
Jeff,
Yes...CPLF...sorry my dislexia.. i ve got exactly the same answer.
Supra,
It's close to a Wave i/o : but the output pins must be changed with GSGSGS arrengement.
Today we have just a trace on it to solder a standalone uf.l connector for theMCLK.
But the rest are just GSSS...which waste the fest witch such RF speed.
At least with .the Aya2014 & the Distinction, we maid possible to enter with uf.l connector with or without simultanous mode....
Jlsounds has an isolator and.maybe ian pcm is 4 layers. But believe here this is more the clocks and.the fifo which change the final result.
Do what your monney allows....i will test both if .Ian answers me one day :) ...Tommy....Tommy (The Who)
 
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richard12

Member
Joined 2011
Sorry jumping in and may be not answering any question. I'm running succesfull TDA1541 DAC over 20 years in I2S mode. It does not need MCLK input!! Connecting BCK, FS (LRClk) and Data is just fine. It runs fine over years from a USB pcm2707 receiver designed by Doude Douma. Since last year the I2S input can be switched between the USB receiver and a Raspberry with Volumio (or Klang&Ton) image. Both supporting I2S from the RaspB. We compared the DAC in a high end shop with expensive DAC's over €2000 (Antilope etc.) and concluded that the amount of bits is of far less importance as expected. It's the output stage which shall become highest attention in the design (of course also the digital design but if this is fine the number of bits is not that important as suggested). If anyone is interested I can detail my 1541 design and output stage (passive IV stage).
 
E

Eldam

Banned
Joined 2012
Thank you for the input Richard,

It's fine, this thread is open and I appreciate true experience like yours.

Hundred pcbs Distinction-1541 were printed for that : each people can choose the way to go around the TDA 1541...

I'm sure many would appreciate your testimonies about I/V : you can go here to write about it http://www.diyaudio.com/forums/digital-line-level/203511-any-good-tda1541a-dac-kit.html : this is the beginning of our humble project where we believed many diyers needed a good enough kit with a coreboard and good layout for the dac chip to experiment and self choose input & output stage.

Many possibilities to input with the TDA1541 : yours with NOS, simultanous mode, FIFO, simple I2S with hifh speed with modern usb to I2S Xmos pcbs....

Choose your own is our liberty and pleasure to experiment:)
 
L

Luke

Member
Joined 2001
Eldam said:
Hello Aronier,

Unluckilly not, all my effort to ask some improvments didn't works : http://www.diyaudio.com/forums/digi...tion-tda-1541-build-thread-8.html#post4087513

JLsounds will not risk to do a pcb for the TDA1541 : certainly too few demands for the cost risk. i can understand that.

i believe a good choice in non simultaned mode is the Lorian Wave I/O if you need an USB to I2S.
Click to expand...

hi Edlam, this is a late reply, I must have missed this. So if I want to run 2 X tda1541 in balanced mode, I need simultaneous mode and the only way to achieve this is with the following chain:

FIFO module > Isolator Module > clock board > I2S to PCM Module > TDA1541A
 
E

Eldam

Banned
Joined 2012
You should have a look to the I2StoPCM board manual : there is two uf-l output traces for an other bclk and data splitted output only ! On the main plastic connector there is also a Dr and Dl plus D&L ! Maybe it can work ! I just don't know and you should ask Ian for that !

My simple understanding will be more : you can not use twice simultaneous mode on the two chips to keep each L and each R of each chip merging the two chips for a balanced DAC (so 2xL & 2xR)! You could only with two dacs uses on the first chip the R channel and on the second chip L chanel... to stay on SE with two chips but with chip which will not have the same delay because the concistency dac chips production despite the same BCLK injected in the two chips !

No interest the difference of concistency between the two chips will give you more problem than using one chip with the simultaneous mode on it ! I should stay on a SE conf then a balanced buffer or more a SE to Balanced traffo at 1:1 (with a buffer before ). And the traffo will avoid you a dc cap. But if you talk tubes... I really don't know ! Ask Wlowes on the distinction-1541 build thread if any idea about tubes if needed!

John spoke about that a long time ago about two dac chips : jitter generator because not syncronisable really !
 
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Luke

Member
Joined 2001
thanks Eldam, your very helpful as usual, I think I know whats on my shopping list:)
I will order my i2s to pcm when he closes his group buy, Im in no rush, still working on another HP amp, just bought new phones and this is how I listen to music these days with kids and neighbors.
 
S

stifa

Member
Joined 2004
Hi...bringing this back to life...

Do you guys know what is the best solution to run AYA dac in simultaneous mode and how?
I have AYA rev 2.0b dac to which an Amareno USB board was added for usb 2 i2s , so it now has USB capabilities.
I've read that Pedja's newer dacs utilize "simultaneous" mode and I was wondering how could I achieve that and if its worth the hussle?
Do I need another PCB of some sort or do I need to reconfgure wiring?
Cheers
2780p%20-%20Copy.jpg


ugly USB cable is temporary due to lack of space to correctly mount Amanero :) Below Amanero is its dedicated PSU Salas board.
 
E

Eldam

Banned
Joined 2012
Hi,

You will need to change the layout ! Look at the TDA1541A datasheet for the simultaneous mode shematic by carrefully reading it. Pin 27/26 are shorted while this time the pin 28 is feeded in negative voltage instead pin 26 (positiv) ...

you need a board to manage the simultaneous mode like the IanCanada PCM board... pin 5 of TDA1541 is feeded with the right channel of the de-multiplexed I2S Data channel !

In your shoes I should leave the board as it is but will putt closer the Amanero board as the I2S links should be very short to reduce the jitter. If possible I will give a gnd wire return for each I2S wire with 50 ohms wires if possible while not mixing the 3 I2S channel together. So the Amanero board in the opposite side from your actual casing.

Is the Amanero giving a decicive better sound in relation to the older Pedja input usb design ?
 
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