Model S will be discontinued by the end of this year

The Model S DAC has been initially released 11 years ago. A current version of this reference TDA1541A D/A converter, a Mark3, will be the last one, and it will be gradually discontinued by the end of this year.

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AYA 4, second run

The AYA 4 was a very nice project, and it apparently remained on your radar way after the originally produced quantity was sold out. So we will make it one more time.

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Classic and transformer coupling: System grounding difference

The use of signal coupling transformers requires a somewhat different approach to the system grounding.

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AYA 4: This year’s AYA release, featuring 192/384 kHz async USB

AYA 4 is 2018 AYA release, with all the features of previous AYA II DACs, and completely changed, now no-compromise, 192 or 384 kHz capable asynchronous USB stage. AYA 4 can be used as usual stereo DAC, but its USB input stage can be also made as 4 channel interface.

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Model S4 is coming

Model S4 comes to show how real audiophile reference USB DAC sounds today. It also includes acclaimed and well known Audial S/PDIF quality input.

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USB board Mk3 and AYA II revisited (proposal)

Two projects proposal for 2018.

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Another story about TDA1541A: 384 kHz

Can this old gem get there?

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Back to the roots: 14 bits (of TDA1541A)

By measuring standard low level performance at -60 dBFS (dithered sine wave), there was practically no difference between its regular 16 bit, and this 14 bit “mode” of operation. Noise floor, on the other hand, is somewhat higher, roughly speaking 6-12 dB, and that is what you would expect, given 2 bits difference.

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USB to simultaneous data or I2S converter, series 2

Audial USB interface second release. Now offered as both module and ready made device.

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USB to simultaneous data (or I2S) board

Audial quality USB interface. At one side it connects to PC via USB port, and on the other it outputs “raw” PCM signal, in simultaneous data or I2S form.

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Transformer coupling pros and cons (in a nutshell)

Purely sonically, transformer coupled output has more calm presentation, with more quiet background, and somewhat more precise soundstage. On the other hand, transformers can lack some definition at the most bottom end. Still, possible benefits and shortcomings depend also on the environment.

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Asynchronous USB to simultaneous data converter board, interest check

Asynchronous USB Audio Class 2.0, galvanic isolation, two oscillators, and reclocked simultaneous data output. With U.FL output connectors it would be adequate companion to AYA II 2014 or DS board, and of course the great possibility to connect PC to Model S MkIII.

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AYA II DS, DIY edition

As announced a few months ago, we have another run of AYA II. This run, marked as DS, includes one update with respect to AYA II 2014: synchronous DEM clocking circuit is now more completely integrated, so it is not optional but integral part of this AYA II project.

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Model S MkIII schedule

In addition to S/PDIF, MkIII version of this converter will also include direct PCM input, able to accept both commonly used I2S and TDA1541A specific simultaneous data protocol.

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AYA II 2014 DIY edition, second run

As an extension of original AYA II 2014 DIY edition offer, here is the second turn of AYA II 2014 orders.

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AYA II 2014 DIY edition talks

Everything related to AYA II 2014 DIY edition building, parts and possible tweaks can be asked, discussed or shared at this page.

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AYA II 2014 DIY edition interest check

As a result of initiative by several TDA1541A fans at diyaudio.com, AYA II DAC may re-appear in 2014.

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OPA861 zero-feedback output stage of AYA II

The output stage of AYA II DAC, released back in 2007, now with details of circuit sitting behind originally posted block diagram. Dare to say, it might be the best I/V circuit published so far.

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PSU transformers, part 2: Model S USB inside

As a follow up to the previous article on transformers, here is how this part is done in the Model S USB. This is also the first public appearance of Model S USB interior.

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Model S MkII

Two and a half year after its release, the Model S goes through a couple of changes. Admittedly, there were no previous plans for substituting the Model S with MkII successor and, as perfected as it is, the overall architecture remains actually intact.

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