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Building the ultimate NOS DAC using TDA1541A
Building the ultimate NOS DAC using TDA1541A
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Old 6th March 2015, 11:59 AM   #5361
Eldam is offline Eldam  France
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Arghhhhh the price of those chips would drop !

Thanks John for the inputs.

It's not clear to me in an I2S flux what is the cause of the changing state : switch of/on curent and voltage (One & zero coding) ? Does a higher sampling frequencies makes the things worst or the speed of the PCM switching gets the things better about this switching noise ?

What is an I2S transcient ? more datas in a same period ? a voltage/current spike ? Is it changed by the speed (sampling frequency). I believe I don't understand the difference between the PCM modulation transport and the transport of encapsuled packets... but below it's the same no ? All analogic : voltage & current on a copper substrate ? Whic makes it "digital" is the speed involved : RF ?

In the same spirit, the more bit depth, the more switching noise as more PCM informations ? Did you have the same measurement with a compressed PCM la FLAC between a raw WAV one ?

Very interresting (as usual with you) all those research you make on the total layout and environment of these dac chips.

thnaks for that.

cheers

Last edited by Eldam; 6th March 2015 at 12:15 PM.
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Old 7th March 2015, 08:24 PM   #5362
j.burtt is offline j.burtt  United States
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I have a friend who has directed me to this thread. He has informed me that over the 9 year span, there have been several changes in the circuit. Could someone direct me to where I could start in the 500+ pages to get into the latest and greatest. I usually take a lot of notes and don't really want to be bogged down in earlier configurations which are no longer used.

James
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Old 9th March 2015, 03:24 PM   #5363
Eldam is offline Eldam  France
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Around 350/ 400....?!
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Old 10th March 2015, 01:58 AM   #5364
maxlorenz is offline maxlorenz  Chile
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I wonder what would happen soundwise if we immerse the DAC board into an inert liquid like vaseline or oil?
Would noise floor drop?

I am tempted to build an hermetic case for that purpose...

I'd certainly do it if I had a big tower of DACs
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Old 10th March 2015, 02:10 AM   #5365
Alexandre is offline Alexandre
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Thought about that a few times. But my goal is 100% protection from oxidation.

Intel Embraces Submerging Servers in Oil | Data Center Knowledge
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Old 10th March 2015, 02:22 AM   #5366
maxlorenz is offline maxlorenz  Chile
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Thanks for the link, dear.

Mineral oil is apparently safe.

Maybe a little class A amp will be fit for experimentation.
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Old 10th March 2015, 06:24 PM   #5367
wlowes is offline wlowes  Canada
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Oil is a great Idea. I tend to fill mine with sand bags.
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Old 10th March 2015, 06:43 PM   #5368
maxlorenz is offline maxlorenz  Chile
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Aren't sand bags intended for speakers?


Dear -EC-
I visited your site yesterday and saw the new products.
Is the output filter of the SD2 player switchable???
I mean, can we select ON or OFF state to compare?

Thank you very much.
M.

Last edited by maxlorenz; 10th March 2015 at 06:48 PM.
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Old 10th March 2015, 07:05 PM   #5369
niamex is offline niamex  Bulgaria
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Quote:
Originally Posted by maxlorenz View Post
I am tempted to build an hermetic case for that purpose...
Very interesting idea. We can eventually think about covering the whole thing with epoxy - from one side it will settle the hermetization issue, however rolling on resistors could be a problem
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Old 10th March 2015, 09:44 PM   #5370
mhgawel is offline mhgawel  Poland
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Hello,

I am about to finish my Red Baron v5.0 NOS DAC. I'd like to go with Grounded-Gate MOSFET Current Buffer I/V Stage MK7 version designed by Johh (ecdesigns).

The question about the buffer stage is if I can safely use higher value of I/V resistor than 500R? Let's say 1k to get 1.41Vrms or 1k5 to get 2.12Vrms? What about Reference GND? May I use 3.3V DC Digital source? Or use 5.0V as in RedBaron v4.0? Or maybe higher: 10VDC or 15VDC according to higher I/V resistor value?

Best regards,
mhgawel
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