First Alexiis, I'm not agree you use my personal photograph in this Forum, It was in the 80's. Now I'm not using feathers anymore !
Secondly, yes AudiolapDance wrote with more efficcienty what I'am thinking about TL431 in the VanoFonk core Board or elsewhere. But I liked the T.L. 431 input because it was in an idea of "Good enough for Diyers" : remember what he said about a little 3D design what diyers could be but not brands or the coper he put around the TDA1541for small decoupling... He is first a diyer mR TL.
In fact from the beginning with the design of Vano and the one I showed in Powersupply section, my fear is : too big design to polutate near the the TDA chip and those design need to be near the load. Some said in the thread I opened : emitter follower is maybe to noisy for capacitive loads (but TDA is not) and I surmise we need to have very small ground loop for the 3 voltages of the TDA1541.
Alexiis, is a cap is enough near the TDA with sucha design who need to be outside of the core Board (so: far) ? And do you think it could be a solution (if not the cap alone) with smd regs I talked about (in the goal to have stable, very quit PS and small grounf loop = SM devices) ? Known of all the existing reg in the worlmd were designed for Audio after all !
Third : An invitation as we talked about clock. Mr Andrea Mori fellow, always here, would you want to work a little work and share with us, or just beginn to try and give up if you will not want anymore after ? Have a look on the Vanofonk PCB for a clock in the core board ? Audiolapdance has the files of the design.
Finally: .... heu nothing... seee you all
Secondly, yes AudiolapDance wrote with more efficcienty what I'am thinking about TL431 in the VanoFonk core Board or elsewhere. But I liked the T.L. 431 input because it was in an idea of "Good enough for Diyers" : remember what he said about a little 3D design what diyers could be but not brands or the coper he put around the TDA1541for small decoupling... He is first a diyer mR TL.
In fact from the beginning with the design of Vano and the one I showed in Powersupply section, my fear is : too big design to polutate near the the TDA chip and those design need to be near the load. Some said in the thread I opened : emitter follower is maybe to noisy for capacitive loads (but TDA is not) and I surmise we need to have very small ground loop for the 3 voltages of the TDA1541.
Alexiis, is a cap is enough near the TDA with sucha design who need to be outside of the core Board (so: far) ? And do you think it could be a solution (if not the cap alone) with smd regs I talked about (in the goal to have stable, very quit PS and small grounf loop = SM devices) ? Known of all the existing reg in the worlmd were designed for Audio after all !
Third : An invitation as we talked about clock. Mr Andrea Mori fellow, always here, would you want to work a little work and share with us, or just beginn to try and give up if you will not want anymore after ? Have a look on the Vanofonk PCB for a clock in the core board ? Audiolapdance has the files of the design.
Finally: .... heu nothing... seee you all
Ok : the little design I showed is a current source; An smd choke could be populate on each rail of Voltage on the core board. And between the smd chocke, inductor and the tda :smd regs and smd caps for decoupling (three leads as first intention to have an easier task to redesign the screen pcb or a simple cap if it's enough !
finallyn T. ,Loesch input is near of what I believed to have understood.
My dear friends:
In any design collaboration, the engineers start with:
1- Defining the objectives
2- Carefully considering the available resources
3- Re-adjusting objectives to better match the available resourses (Modifying Point 1)
4- Proposing the 'simplest' implementation that satisfies the Design Requirements ****
5- Making carefull (and correct) measurements to verify that Design objectives are met
6- If not, a particular Design (base) will be (slightly) modified to better accomodate the Design Requirement.
7- Going back to point 5 and repeat.
I wholeheartedly apologize to Mr. Eldam, but I have a lot of difficulty understanding his posts.
I lack the lingual skills to fully understand his texts. Can you possibly write in French? we can use google translate.
If you are referring to your schematics (TL431 + Bipolar Series Regulator),
I believe it is a very good platform to base your design (TDA1541 dac) upon.
Somehow you do not share my opinion. Please note point 4 above:
- It is not recommended to start with a complex design and ''simplify'',
- It is recommended to start with the simplest design and ''Ellaborate''.
This is the logical order of series of events.
If, for some reason, something more complicated is required, go with
Mr. X and Mr. Nazar's Capacitorless PSU.
I know Mr. T suggests TL431-based regulators, with all do resepect, I do not
recommend at all the way he implements them.
But he has the Technical Knowledge and the equipment to get away with it (Point 5).
You state that someone claims the TL-431 is noisy because it is TL-431 and a Shunt Regulator.
It is as unclear as saying food, in a Gourmet French Restaurant.
Please read my previous posts.
- Regulator Ouput Noise is measured by manufacturers under conditions (Power Feed, Loading, etc) that you simply cannot match.
- Please, stop the insanity and get to work (Designing your dac).
- I advise against using TL-431-based, Shunt Implementation Regulators (the way Mr. T uses them) for diy:ers.
- It is not a Diode, and you cannot use it as such.
- You have everything needed to design a fairly good sounding TDA1541 based Dac.
- Base your design on an existing platform.
- Do not modify too much.
- Do not try to throw all but the kitchen sink into the design.
My friends: These are very valuable advice, do not let them slide by unnoticed.
GET TO WORK AND START DESIGNING YOUR DAC.
-
In any design collaboration, the engineers start with:
1- Defining the objectives
2- Carefully considering the available resources
3- Re-adjusting objectives to better match the available resourses (Modifying Point 1)
4- Proposing the 'simplest' implementation that satisfies the Design Requirements ****
5- Making carefull (and correct) measurements to verify that Design objectives are met
6- If not, a particular Design (base) will be (slightly) modified to better accomodate the Design Requirement.
7- Going back to point 5 and repeat.
I wholeheartedly apologize to Mr. Eldam, but I have a lot of difficulty understanding his posts.
I lack the lingual skills to fully understand his texts. Can you possibly write in French? we can use google translate.
If you are referring to your schematics (TL431 + Bipolar Series Regulator),
I believe it is a very good platform to base your design (TDA1541 dac) upon.
Somehow you do not share my opinion. Please note point 4 above:
- It is not recommended to start with a complex design and ''simplify'',
- It is recommended to start with the simplest design and ''Ellaborate''.
This is the logical order of series of events.
If, for some reason, something more complicated is required, go with
Mr. X and Mr. Nazar's Capacitorless PSU.
I know Mr. T suggests TL431-based regulators, with all do resepect, I do not
recommend at all the way he implements them.
But he has the Technical Knowledge and the equipment to get away with it (Point 5).
You state that someone claims the TL-431 is noisy because it is TL-431 and a Shunt Regulator.
It is as unclear as saying food, in a Gourmet French Restaurant.
Please read my previous posts.
- Regulator Ouput Noise is measured by manufacturers under conditions (Power Feed, Loading, etc) that you simply cannot match.
- Please, stop the insanity and get to work (Designing your dac).
- I advise against using TL-431-based, Shunt Implementation Regulators (the way Mr. T uses them) for diy:ers.
- It is not a Diode, and you cannot use it as such.
- You have everything needed to design a fairly good sounding TDA1541 based Dac.
- Base your design on an existing platform.
- Do not modify too much.
- Do not try to throw all but the kitchen sink into the design.
My friends: These are very valuable advice, do not let them slide by unnoticed.
GET TO WORK AND START DESIGNING YOUR DAC.
-
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QUOTE / I know Mr. T suggests TL431-based regulators, with all do resepect, I do not
recommend at all the way he implements them UNQUOTE
Thank you for the answer to my question because I had a doubt on the way vanofonk implemented TL431 on is PCB. That's all, nothing else than this. It is not criticize your advices. I talked about smd because most engeneer seem to go like this like with the little Subbu V3 I have (good sound but simplier objective as it is "a do all" dac chip !)
Sorry for my english and sorry not to be always agree with you. It remind me something you wrote before... Doubt is a second nature like food for french. I tried Google translate before : it's worse, you simply can not understand anything with it. doubting is a right we add with blood very soon in our history and than many others people took advantage in their more recent history.
I SHALL try less inputs now. Afterall there is a good dynamic now and here it's not a personal attack like before against me or the project. Ok, noticed.
I hope my english is good enough for the understanding of this post. Anyway you seem with Audiolapdance to be excellent "project manager" with different qualities and point of view which not bad for those difficult project as people come back always to their own point of view ! But here if it's good for the project I agree with you.🙂
Ok let's continue, this is not me who want to stop the thread about this new focused goal !
Eldam.
PS: If you say Food in a good french restaurent it's for your dog...translate french is a difficult task in the 2 sens !😉
recommend at all the way he implements them UNQUOTE
Thank you for the answer to my question because I had a doubt on the way vanofonk implemented TL431 on is PCB. That's all, nothing else than this. It is not criticize your advices. I talked about smd because most engeneer seem to go like this like with the little Subbu V3 I have (good sound but simplier objective as it is "a do all" dac chip !)
Sorry for my english and sorry not to be always agree with you. It remind me something you wrote before... Doubt is a second nature like food for french. I tried Google translate before : it's worse, you simply can not understand anything with it. doubting is a right we add with blood very soon in our history and than many others people took advantage in their more recent history.
I SHALL try less inputs now. Afterall there is a good dynamic now and here it's not a personal attack like before against me or the project. Ok, noticed.
I hope my english is good enough for the understanding of this post. Anyway you seem with Audiolapdance to be excellent "project manager" with different qualities and point of view which not bad for those difficult project as people come back always to their own point of view ! But here if it's good for the project I agree with you.🙂
Ok let's continue, this is not me who want to stop the thread about this new focused goal !
Eldam.
PS: If you say Food in a good french restaurent it's for your dog...translate french is a difficult task in the 2 sens !😉
Thank you Eldam for the offer, unfortunately I humbly decline.
As I said earlier:
- any input is a good input.
- nobody is excluded.
- everyone is welcome
- I would assume Audiolapdance or Eldam would be very good project managers
- you need to find a good PCB designer
Cheers
As I said earlier:
- any input is a good input.
- nobody is excluded.
- everyone is welcome
- I would assume Audiolapdance or Eldam would be very good project managers
- you need to find a good PCB designer
Cheers
Hé Alexiis you understood my English…. Thank you Lord for the miracle😀 !
It was not an offer but second degree gentle joke 😉to soften your Viking fit of temperament against my doubts (not against you) and to stay democratric as you writed yourself elsewhere above.
I understood there are no project managers. I jut see you, I, and Audiolapdance more like goodwilled personn who like to share their hope and/or experience (you are in this last case). Yes everybody is welcome (if English spoken 😀) to help as we have a a little roadmap 🙂hohoho:T. Loesch inputs: see Audiolapdance paste & copy and links).
At this moment we need if a designer, a person who can draw some hints and modifications on a 2 layers already existing pcb.
at Audiolapdance : did you have any proposition of serious people (to share & non commercial use) on pm for giving the screen files ?
Unfornately : we had some testimonies of people but they have pain go give technical inputs or to share time.
We have people who want to share under condition because they have already something and if expert comment their work only. I would answer share first you will see, you could just have better surprise than nothing and maybe something better at the end.
Experts do not answer to the invitation certainly because the problems are not focused yet or not interested anymore.
Audiolapdance, what do you think if we send some humble invitation to few people on their pm about correcting the vanofonk screen pcb and if not to correct the design schematic than vanofonk gave as well?
What we have and need :
- It is an I2S input board (people will get what they want : spidf board (I have an non expensive address with W8805 chip in hardware like software mode, master or slaved mode with switch) or USB à la Amareno or DSP… whatever.
at fellows :
- We need someone else to draw and correct the screen pcb like VanoFonk did.
- We need first a very stable clock near the dac chip not to waste the ECDESIGN hints about I2S inputs and fellow(s) who can participate to this work.
- Powersupply is not a problem, designs already exist.
- we need the outputstage (because of current return) to be placed on the core board : I/V solution need to be choosen. Tubes are good but dangerous for noobs and beginners. Maybe an I/V à la OP861 (schematic already exist given by Pedja Rodjic from Audial) is a good enough compromise ?
- we need maybe a little buffer with no caps at the output : J. Gerhard fellow gently offer a simple and good design if you have a 2V before ?
This is a non commercial project for the DIYA fellows to have a just pcb GB (or put on a print web plateform) for TDA1541. Not to share for everyone the datafiles to copy it of course if you want not your work and participation to be re-used by lazy people for commercial interests. I think we can have the gentlemen trust of fellows like Audiolapdance or others well known here. Gift like Vanofonk or 3stlup maid woerth consideration from us !
Sorry to be long here i am the first thinking there is too much blabla (but the project has to be defend against bad willed people
). Please share with us ! I promises I will really intervene less because my bad English, here it is just to resume and rerun the requests. 🙂
It was not an offer but second degree gentle joke 😉to soften your Viking fit of temperament against my doubts (not against you) and to stay democratric as you writed yourself elsewhere above.
I understood there are no project managers. I jut see you, I, and Audiolapdance more like goodwilled personn who like to share their hope and/or experience (you are in this last case). Yes everybody is welcome (if English spoken 😀) to help as we have a a little roadmap 🙂hohoho:T. Loesch inputs: see Audiolapdance paste & copy and links).
At this moment we need if a designer, a person who can draw some hints and modifications on a 2 layers already existing pcb.
at Audiolapdance : did you have any proposition of serious people (to share & non commercial use) on pm for giving the screen files ?
Unfornately : we had some testimonies of people but they have pain go give technical inputs or to share time.
We have people who want to share under condition because they have already something and if expert comment their work only. I would answer share first you will see, you could just have better surprise than nothing and maybe something better at the end.
Experts do not answer to the invitation certainly because the problems are not focused yet or not interested anymore.
Audiolapdance, what do you think if we send some humble invitation to few people on their pm about correcting the vanofonk screen pcb and if not to correct the design schematic than vanofonk gave as well?
What we have and need :
- It is an I2S input board (people will get what they want : spidf board (I have an non expensive address with W8805 chip in hardware like software mode, master or slaved mode with switch) or USB à la Amareno or DSP… whatever.
at fellows :
- We need someone else to draw and correct the screen pcb like VanoFonk did.
- We need first a very stable clock near the dac chip not to waste the ECDESIGN hints about I2S inputs and fellow(s) who can participate to this work.
- Powersupply is not a problem, designs already exist.
- we need the outputstage (because of current return) to be placed on the core board : I/V solution need to be choosen. Tubes are good but dangerous for noobs and beginners. Maybe an I/V à la OP861 (schematic already exist given by Pedja Rodjic from Audial) is a good enough compromise ?
- we need maybe a little buffer with no caps at the output : J. Gerhard fellow gently offer a simple and good design if you have a 2V before ?
This is a non commercial project for the DIYA fellows to have a just pcb GB (or put on a print web plateform) for TDA1541. Not to share for everyone the datafiles to copy it of course if you want not your work and participation to be re-used by lazy people for commercial interests. I think we can have the gentlemen trust of fellows like Audiolapdance or others well known here. Gift like Vanofonk or 3stlup maid woerth consideration from us !
Sorry to be long here i am the first thinking there is too much blabla (but the project has to be defend against bad willed people
). Please share with us ! I promises I will really intervene less because my bad English, here it is just to resume and rerun the requests. 🙂
- Audiolapdance = good Technical Project Manager
- Eldam = good Design Manager: gathering inputs. synchronising, etc
- Mr. vanofonk = pcb designer/Manager.
. Ask Mr. vanofonk nicely to contribute: Can he make changes to his own PCB, as this may actually help improve his original design?
Clock placement:
- TDA1541 does not have a "MCK" as in other types of DACs.
- Putting any clock inside the DAC Platform will bring forth the need to Slave the Transport to this DAC Master clock.
==> Not diy friendly (your transport needs to be massacred).
- Amanero USB Reciever is an interesting choice.
Dear Eldam: keep your texts short.
- cheers
- Eldam = good Design Manager: gathering inputs. synchronising, etc
- Mr. vanofonk = pcb designer/Manager.
. Ask Mr. vanofonk nicely to contribute: Can he make changes to his own PCB, as this may actually help improve his original design?
Clock placement:
- TDA1541 does not have a "MCK" as in other types of DACs.
- Putting any clock inside the DAC Platform will bring forth the need to Slave the Transport to this DAC Master clock.
==> Not diy friendly (your transport needs to be massacred).
- Amanero USB Reciever is an interesting choice.
Dear Eldam: keep your texts short.
- cheers
I have already informed about The best Output Stage (diy friendly):
- Tube: Lampizator, see previous posts from me.
- Solid Stage: TNT Output Stage: see previous link from me.
Pedja's output stage = not recommended. Sorry, I mean no disrespect.
Ha det...
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Nonono, lampizdator is a worst nightmare audio equipment could dream of.
The easiest of exotics is ad844, in multiples, followed by fet-input buffer. With passive filter in between.
I'd stay off discetes unless they cure problems seen in ICs.
The easiest of exotics is ad844, in multiples, followed by fet-input buffer. With passive filter in between.
I'd stay off discetes unless they cure problems seen in ICs.
Not necessarily so, using Ian's FIfo buffer as ASRC the source clock is independent, and the Fifo buffer has to be slaved instead of the source.
That means the master clock should be the bit clock of the TDA1541A (max 5.6448MHz), placed closer as posssible to the DAC chip. The same clock should be sent back to the fifo buffer that will operate at 128fs (the TDA will discard any exceeding data).
So, assuming the Fifo buffer as ideal complement, anyone is free to chose any I2S source. And one can get a system rather than a DAC, compliant with any I2S source.
@Eldam
I'm working around a good master clock, but my times is usually long, since I have just a little free time. I would provide a connector on the PCB to plug in the MCLK board (perpendicular to DAC PCB).
I'm also working around a IV tube dac output stage, but the components occupy a large space, so a separate PCB is needed.
I wouldn't implemente the buffer stage on the DAC PCB, so one can use multiple options for that stage, maybe I would provide only the place to fit the IV resistor if needed (my output stage don't need an IV resistor).
with a little help from my friends 
:
I use 3 quatrode shunt regulators in the new TDA1541A project (The TDA1541A DAC project has been finally picked up again)
http://www.diyaudio.com/forums/digi...e-nos-dac-using-tda1541a-500.html#post3892750
maybe you will agree with those fellow !
The TDA long long quest continue !
Will Vador Joshua will cut the hand from Audiolapdance Skywalker ? Do John 's Solo Ecedesign will accelerate the hope of Eldam Chubaka spoking english... Do the final work would have the WAF agreement of ours WAF princess Leïa organisation ?
Stay tuned !
:I use 3 quatrode shunt regulators in the new TDA1541A project (The TDA1541A DAC project has been finally picked up again)
http://www.diyaudio.com/forums/digi...e-nos-dac-using-tda1541a-500.html#post3892750
maybe you will agree with those fellow !
The TDA long long quest continue !
Will Vador Joshua will cut the hand from Audiolapdance Skywalker ? Do John 's Solo Ecedesign will accelerate the hope of Eldam Chubaka spoking english... Do the final work would have the WAF agreement of ours WAF princess Leïa organisation ?
Stay tuned !
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Hi s3tup, always a pleasure doing business with you.
Sorry to hear that:
Have you had a bad (sonic) experience with Lampizator's recommended output stage?
Hi Andrea_mori:
You are abslutely right, I apologize for my somewhat perfectionistic view on dacs.
Many ideas. Keep them coming +++
- hd...
Lampizator name, for me, sums-up all the possible disasters to the electronic devices. Lack of technical understanding and tons of BS everywhere. I'm extrapolating all of this into his output stage.
Never heared it, never will 🙂
Never heared it, never will 🙂
sure than a Output stage à la Gomez with good tubes and a good output amorphous transformer ( and the good passives components where they have to be) will outperform all the hints of Lampizator.
T loesch spend many times to apply tubes design for the TDA1541 output... and here fellows gave good testimonies about the Gomez conf as it is I believe in the AMR CD-77 (but without output transformer or rare tubes). I see Lampi more like a marketing genious than a RF specialist... I agree with you S3TL... (as I have myself try bad inputs from him about the spidf line of the squeeze box Duet)
T loesch spend many times to apply tubes design for the TDA1541 output... and here fellows gave good testimonies about the Gomez conf as it is I believe in the AMR CD-77 (but without output transformer or rare tubes). I see Lampi more like a marketing genious than a RF specialist... I agree with you S3TL... (as I have myself try bad inputs from him about the spidf line of the squeeze box Duet)
Thank you s3tup for sharing your experiences.
I have built and listened to many output stages, including Lampizator's output stage,
(which essentially is an Audio Note-inspired output stage).
Despite its technical shortcomings and poor implementation, it sounded outstanding.
I don't use it anymore, but it was imho an excellent output stage.
cheers
Well, imho what Mr. Fikus has done is really phenomenal.
He joins the group of those selected few that willingly share
their research and experiences with others, and that means a great deal to me.
I am very greatful to him for his sharing his knowledge so extensively.
I do not agree with the ways he 'implements' his ideas from an Applied-Electronics
point of view:
- looongish cables,
- electrolytic caps for digital psu's,
- messy design
- low plate voltages
- little attention to detail, etc
but I do not agree either on many things with Mr T, Mr ECDesigns, etc.
The likes of Mr. T, Mr. ECDesigns, Mr. Fikus, Mr. s3tup, Mr. Nazar are all very respected in my book.
If you ever get the time to read history, you will notice that much of the vast
knowledge in the Ancient Sciences, Medicine in particular, were forever lost because people refused
to share their knowledge with the rest of the world.
An Eastern Philosopher once wrote: the unwritten 'taxation' on knowledge is that which only the exalted ones willingly pay.
cheers
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believe me... I read the history and love Epestimology as well! Last reading was about a monography about the Emperor Justinien...(900 pages... in french !) but people don't care. If you take the time read me as you say at the end exactly what I write all the time about sharing... even the will of sharing counts !
About Fikus, I just say his RF knowledge was poor not all him work a sthe most of it is above my own understanding. But after ewperienced some of him RF hints... i can say it with any doubt... whic is not a Fikuz bashing like some do elswhere !
I'm agree with you as Fikus was one of the DIYERS (like Hiraga - which as a perfect understanding as engeener- or fews frenchs who gave me the passion of DIY...but not the hifi and music...). The most i like with Fikuz is him sense of marketing and telling story with a simple web pages... Sure he is a clever man in his own style !🙂
S...t too long always !
About Fikus, I just say his RF knowledge was poor not all him work a sthe most of it is above my own understanding. But after ewperienced some of him RF hints... i can say it with any doubt... whic is not a Fikuz bashing like some do elswhere !
I'm agree with you as Fikus was one of the DIYERS (like Hiraga - which as a perfect understanding as engeener- or fews frenchs who gave me the passion of DIY...but not the hifi and music...). The most i like with Fikuz is him sense of marketing and telling story with a simple web pages... Sure he is a clever man in his own style !🙂
S...t too long always !
yeap Alexiis, I believe you believe me... To have a 2 cents inputs: modern civilisations tend to beam towards individualism; look at global warming ! But have great tools to share like medecine and Internet. Which are technologies who bring people together, even with individualsm hobby like listen to music !
But sometimes i mean, in the same situation like here but on a island with few water and just a wall plug for music... it would be difficult to survive... as people don't share always the grup interest ! BUT i have hope because there always some people who share like on this thread ! If we can talk, problems can be resolved !
It's fun than John (ECDESIGN) has been re-beginning its thread. This particular thread about a "good enough" kit is going to die, because people have no time to apply the hints on the Vano PCB or the will to share it with others if they apply the advices writted here ( and I didn't talk any more on a scratch version 🙁 ) . But few are concerned by ECdesigns hints because all of it are smd but sharing is always a good idea and attitude). 🙂 . Here John is writting for the "expert" of DIYA and for the one who want to buy him player. I think it's a positiv win-win attitude.
But sometimes i mean, in the same situation like here but on a island with few water and just a wall plug for music... it would be difficult to survive... as people don't share always the grup interest ! BUT i have hope because there always some people who share like on this thread ! If we can talk, problems can be resolved !
It's fun than John (ECDESIGN) has been re-beginning its thread. This particular thread about a "good enough" kit is going to die, because people have no time to apply the hints on the Vano PCB or the will to share it with others if they apply the advices writted here ( and I didn't talk any more on a scratch version 🙁 ) . But few are concerned by ECdesigns hints because all of it are smd but sharing is always a good idea and attitude). 🙂 . Here John is writting for the "expert" of DIYA and for the one who want to buy him player. I think it's a positiv win-win attitude.
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Tad on the digital frontend, simplified one - made it yesterday (schematics only + 90% footprints for components):
http://s3t.it/data/uploads/digital_frontend_mk2_v0.pdf
There are some small mistakes, some of these due to some assumptions which should be proven to be wrong... No PS section yet. One of the MUXes should be moved to WM sheet as it is the right place for it.
Otherwise it looks okayish. The PCB lays itself out quite nicely, with 2 halves - low noise RF + crude DF digital.
No higher-than-44/48kHz support, as DFs don't like that. TDA is 16bit, so Hi-Rez 24bit content would anyway fail due to bit truncation...
The board fits PCM63/58/other vintage DACs. So it will help me going for them in the future.
3 DF options. Missing a 1.5x multiplier for CXD DF, gonna be something Sil-based + DFF divider.
I could manage that on 2-layer PCB as far as i see it. No more than 10x10cm footprint, maybe less.
Ability to work with regular SPDIF as well as syncronizing the music source with another SPDIF channel (works with soundcards which have SPDIF input and are able to lock on it - most semi-pro cards as well as some based around ENVY chip. M-Audio Transit *might* work, but it is TosLink-based.).
Seems i've dropped a lot of things in favor of simple solution.
- DF bypass (NOS) with a flip of a switch... Dunno, maybe. Never liked it.
http://s3t.it/data/uploads/digital_frontend_mk2_v0.pdf
There are some small mistakes, some of these due to some assumptions which should be proven to be wrong... No PS section yet. One of the MUXes should be moved to WM sheet as it is the right place for it.
Otherwise it looks okayish. The PCB lays itself out quite nicely, with 2 halves - low noise RF + crude DF digital.
No higher-than-44/48kHz support, as DFs don't like that. TDA is 16bit, so Hi-Rez 24bit content would anyway fail due to bit truncation...
The board fits PCM63/58/other vintage DACs. So it will help me going for them in the future.
3 DF options. Missing a 1.5x multiplier for CXD DF, gonna be something Sil-based + DFF divider.
I could manage that on 2-layer PCB as far as i see it. No more than 10x10cm footprint, maybe less.
Ability to work with regular SPDIF as well as syncronizing the music source with another SPDIF channel (works with soundcards which have SPDIF input and are able to lock on it - most semi-pro cards as well as some based around ENVY chip. M-Audio Transit *might* work, but it is TosLink-based.).
Seems i've dropped a lot of things in favor of simple solution.
- DF bypass (NOS) with a flip of a switch... Dunno, maybe. Never liked it.
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