Distinction-(TDA)1541 Build Thread - diyAudio
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Old 31st July 2014, 09:25 PM   #1
Eldam is offline Eldam  France
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Default Distinction-(TDA)1541 Build Thread

Distinction-1541 build thread to ask and discuss !

Long long time ago a question was asked about "Any good TDA 1541A kit" existence, certainly in relation to the bad kits & layouts seen on Ebay: Any good TDA1541A DAC kit?

This famous and complex old 16 bits dac chip from Philips is still loved for its particular representation of sound & versatility of implementation... When accuracy & details are not the only final goal of music lovers...

The "Distinction-1541" is the result of the shared will, experience & knowledge of goodwilled fellows around the idea to have a good enough non commercial coreboard pcb. Because a huge space exists between the best commercial SOTA designs and the very bad kits from Ebay, diyers still needed a "good enough" pcb to test the best shared options.

A complete kit was not possible: too many options for the input stage or outputstages. And... this is for non commercial use only... also for a maximum of TDA-1541 lovers !
"Distinction-1541" interest group buy : Group buy/Interest list - TDA1541A Core board.

Some of the best ideas were kindly given since many years to the diyers communauty by famous diyers like John from ECDESIGN, Thorsten from AMR, Pedja from AUDIAL and are present with several possible final choices.

So here is the place to talk about the populating options of the Distinctive-1541 coreboard (PS, DEM, I2S, simultaned mode, caps, resistors, wine, beers

Inputs stage can be also discussed here : DIY input stages kits for TDA1541 understanding for non specialists

Output tube (and related power supply) stage are discussed here ( Andrea_Mori & Ceglar): non high voltage specialists & experienced with tubes: get away, this can kill you :DAC IV and buffer, need your contribution

As the Distinction-1541 is versatil, layout allows vias for a daughter clock board Andrea is designing around a very good Crystal. The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator

Output stages with Solid-State can be discussed in this thread below, e.g. : Cen/ZEn, buffer, output stages of Powersupply.

People are here to help each others as the coreboard pcb was firstly maid for experienced people... and not animals (see photograph): so stay cool, answers are not guaranted... after all this is non commercial !

Chewie
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Last edited by Eldam; 11th September 2014 at 01:29 PM.
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Old 1st August 2014, 09:01 AM   #2
Ceglar is offline Ceglar  Australia
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Yeah… go Chewie with the slow-mo n'blow camera shot !!

You stud, you.
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Old 1st August 2014, 12:26 PM   #3
Eldam is offline Eldam  France
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Yeah all the wemen look at me with my string on the beach or when at ski in the mountain (wookie is more regulated than the best power supplies & stay cool in all circonstances !)

... Pets makeup have a great future ! This market is totaly business free ! I'm working also on a brand new concept: makeup line for fabric material : burkas, commando masks, surgeons mask, japanese anti gripp masks are a little sad and needs some embellishment... imagine a commando masks with a big lipstick smile on it before an assault : nicer for the info mess on TV !

But the huger market is for the domestic pets : frenchs are very sensible with fame like japaneses are with their dogs and cats ! A barber shop for wookies, with an Ongaku Kissa in a french Castle in the same time... with some crocodile fishing party above the moats after wine degustations ? Still looking for a new job ! trying to sell this last idea to Club Med for their villages !

Last edited by Eldam; 1st August 2014 at 12:36 PM.
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Old 2nd August 2014, 01:06 AM   #4
Ceglar is offline Ceglar  Australia
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Do you think there'd be a market for bikinis made from wookie hair?.. surely softer than rabbit fur with all that product you must be using.

What sort of pet does a wookie have?
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Last edited by Ceglar; 2nd August 2014 at 01:12 AM.
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Old 2nd August 2014, 09:41 AM   #5
Luke is offline Luke  New Zealand
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A reference BOM maybe useful, I appreciate there is not a definitive BOM for this project. A group buy maybe a good idea too, but perhaps would be hard for something like this as there will different ideas about what to use.
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Old 2nd August 2014, 10:23 AM   #6
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by Luke View Post
A reference BOM maybe useful, I appreciate there is not a definitive BOM for this project. A group buy maybe a good idea too, but perhaps would be hard for something like this as there will different ideas about what to use.
Hi Luke,

Tell us a bit about your future setup and your goals are for the sound quality, etc. Are you interested in experimenting? Or do you just want a finished product? What are you thinking you want to do with the DEM? Are you going to use the 6k8 resistors to stabilize the oscillator? Or are you considering an external solution such as locking it to BCK, as in the Grundig solution?

There really are many options, you'll have to go down a path that will lead to your ultimate goal.

For me i didn't quite know exactly what i wanted until i heard just how good this DAC could sound with a really good layout. It seems that this is the most critical aspect for the TDA1541A. So the components you choose will not have as big an impact on the sound quality as the layout in my opinion, although good quality parts are essential.

Ryan
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Old 2nd August 2014, 11:52 AM   #7
Eldam is offline Eldam  France
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We can maybe try to make a short list for 2 or 3 options of DEM then give the values around. Some people like me or Badri e.g. are not sure about what they want. For me I'm goging also to have the Audial PCB so I will try two or three setup.

Have also some ideas about reference polymers near the dac but most of people think it's magic & not important, experience shows me the opposite : the process comes at the end but is important...unluckily this not universal as the setup is maid on a subjectiv hifi system but it allows to avoid the bad results like too smooth, too dry, too tighty, worst tonal results... my speakers have a neutral tonal balance (35 hz to 30 k hz) and amps is transparent I have not yet my I2StoPCM boards... think Ian is off for summertime...

Also for I/V resistor we can propose a short list starting to a good cheap resistor (e.g. Ceglar go with carbon with tubes iirc).

I think maybe we can start with the values used by experienced users like Ryan or Shane if different, I'm going to try also the DEM of John with him 0.33 uF decoupling caps and the 6k8 resistors. About the resistors : series has to be given also; e.g. Sussumu RR low noise (?) if smd. Thick resistor elswhere when on the signal (?)

I like this pcb : so versatil : you can use smd like bulk parts !

@ Shane : : fur is protected ! the only one Leia want to have is her wookie alive and our dog. Nono, my string on beach and at ski stations are in red fabric : same color than the one of your australian bodyguards ! Poor rabitts, let them breath !
Just came back from the 2500s anual wookies congress : Wookie is protected in all the galaxies, even a japonese member said than they can't have sepuku ! But here we saw than on earth, big coward hunters with big stomach and little bollocks kill always white druged white lions in South Africa private parcs... At the Wookies congress we found strange than hunters with antlers hunt lions while their wives are catched at home ! Maybe the last cartbridges they can shoot ?
Please find a photograph of our dog called Jaba the hunt ! Maybe we can call him Putama or Obamine ?! But even the dogs let the children live !
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Last edited by Eldam; 2nd August 2014 at 12:06 PM.
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Old 2nd August 2014, 12:16 PM   #8
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by ryanj View Post
Hi Luke,

Tell us a bit about your future setup and your goals are for the sound quality, etc. Are you interested in experimenting? Or do you just want a finished product? What are you thinking you want to do with the DEM? Are you going to use the 6k8 resistors to stabilize the oscillator? Or are you considering an external solution such as locking it to BCK, as in the Grundig solution?

There really are many options, you'll have to go down a path that will lead to your ultimate goal.

For me i didn't quite know exactly what i wanted until i heard just how good this DAC could sound with a really good layout. It seems that this is the most critical aspect for the TDA1541A. So the components you choose will not have as big an impact on the sound quality as the layout in my opinion, although good quality parts are essential.

Ryan
I would like to keep it simple just so as I get something built and maybe try different things if I feel like improving it, ie simple iv like cen, simple 3 terminal pre regs and a tl431 near the chip.
I would like to use ians i2s to pcm and usb is what I use. When it comes to clocks I just dont get it. Please confirm that DEM is something I should is if I have no external clock. If that's the case given I want to use Ians I2S to PCM, and dont want to buy a clock at this stage, I should use DEM. Is this correct. And if I use DEM, I should use the 6k8 resistors as they seem to make an improvement, why wouldn't I?
Im nervous about smt, I dont like it and I think with my 50watt goot iron, I will struggle to get the caps soldered with out overheating. Which brings to my next question, off topic of course, whats a good iron to use for these. We have jaycars here, they must have something.
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Old 2nd August 2014, 01:09 PM   #9
Eldam is offline Eldam  France
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Luke, if shunt reg is used : yes it has to be very close to the dac chip and the value before the shunt very big (10k to 20k uf) : you will need to stack above the Distinction coreboard ! 3D design as says Mr T. ! If you use the shunt with TL431 (than you will buy from On Semiconductor as many dispersion from constructor with this chip) : you will just need to ue 0.1 uf 0603 smd NPO for PS decoupling near the dac chip ! (I'm not talking about the 14 decoupling of course : ceramic here has to ne avoid). It's a question of impedance profil, to have it the flatest we can pragmally have... Look also at the regulated shunt regs section maid by Abraxalito in him private blog here ( the Art of analogic iirc !)

If you are looking for already maid 3 legs regulator la 78xx I opened a thread in the PowerSupply section. It's not for this DAC board but could be if needed as I ask for supply a digital dac section as well !

Believe than for farer PS, Nazaar fellow shematics are interresting !

Last edited by Eldam; 2nd August 2014 at 01:15 PM.
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Old 2nd August 2014, 01:24 PM   #10
Eldam is offline Eldam  France
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Quote:
Originally Posted by Luke View Post
IIm nervous about smt, I dont like it and I think with my 50watt goot iron, I will struggle to get the caps soldered with out overheating. Which brings to my next question, off topic of course, whats a good iron to use for these. We have jaycars here, they must have something.
I'm asked the same when I soldered for the first time smd with Subbu.

Answer is a Weller with magnastat with 60/40 soldering material & some flux (many thread here). Look also the Bob's Thread about smd soldering : 'Subbu V3 build thread" : even video to allow you to start with less risks !
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