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.

The project itself will stay intact. Ergo, we have a DAC with USB (up to 192/384 kHz) and S/PDIF (up to 96 kHz) input stages, optional I2S/PCM (U.FL) direct input, a TDA1541A based D/A conversion stage, and zero feedback OPA861 based I/V and output buffer stage. It is all fed by eight separate supplies, with low noise, mostly discrete regulators.

For more detailed information, please have a look at the original AYA 4 topic, the AYA 4 user manual, and the AYA II output circuit.

 

 

 

 

Ordering

The offer is open for two weeks, so until 22 March. The PCBs and transformers will ship by the end of April, and completed units will ship during the first half of May.

When placing an order, please use a message box at check out to possibly request optional features, such as 22.5792 / 24.576 MHz USB stage master clocks (required for up to 384 kHz compatibility), a four channel USB interface firmware, a 100 VAC transformer primary, etc. No worries if you miss to do this though, as you can send your preferences also by contact form, or by replying to this topic – all these channels are regularly watched.

So, this time the AYA 4 is available as:

 

1. Unpopulated PCB – €40 each plus €15 shipping

Assembly manual, including the schematics circuits and part list, is provided, however please note that it does not cover the USB stage. In many instances, the USB stage is not very DIY friendly SMD technology, so DIY endeavors for this stage is not supported. For the customers who want to use a USB stage, and build themselves as much as possible, option 2 is recommended.




 

 

 

2. PCB with mounted USB stage – €190 each plus €20 shipping




 

 

 

3. Completely mounted PCB – €510-610 each plus €20 shipping

Such a PCB and transformer make practically a working unit. You will additionally need only the chassis and chassis mounted connectors and switches.

Those who don’t need both USB and S/PDIF can opt for one on-board input stage and one U.FL direct input.


Inputs:



 

 

 

4. Dedicated AYA 4 transformers, with double primary, intended to work with either 110-120 VAC or 220-240 VAC mains voltages, and with eight secondary windings, are available this time too. On demand, a 100 VAC primary is also available. You can choose between toroidal and EI units. Isolation transformers are available as well.


Type:



 

 

 

5. Stereo balanced or four channel single end AYA 4 (USB), kit – €910, plus €30 shipping

This kit comprises two boards: one board includes USB stage with necessary firmware, and both boards include D/A and output stage. A dedicated transformer with 12 secondary windings and U.FL cables are shipped too. Stereo balanced and four channel unbalanced (single end) setup are the same hardware – it is the USB firmware that makes the difference between these two.


Setup:


 

 

 

6. Completed AYA 4 unit – €850, plus €30 shipping

So, everything done, and put into the chassis with Audial logo.




 

 

 

One Reply

  1. Avatar
    15-03-2019

    I am receiving some typical questions on the optional features offered with AYA 4 USB stage, so let me explain these.

     
    Up to 384 kHz compatibility.
    This requires 22.5792 / 24.576 MHz clocks and matching firmware.

    The best sound I achieved by the digital source was by using a 384 kHz recordings. The problem here is, currently there is not a lot of such recording available around, and this fact probably won’t change any time soon. On the other hand, in my experience it is always preferred (sound wise) to use the lowest possible master clock frequencies, so in that way an 11.2896 / 12.288 MHz master clocks are recommended to those who don’t plan to go beyond 192 kHz.

     
    Four channel operation.
    This requires 4 output U.FL connectors installed and adequate firmware.

    This should be considered an “addition”, since the unit (or board) operates normally, as if it was two channel, but two more channels are available as PCM digital output, for D/A conversion by another two channel D/A stage. AYA 4 and AYA II 2014 / DS have the same D/A stage, so any of these can be used for two additional channels D/A conversion.

    You choose stereo or four channel operation by PC (either in the system sound settings, or in the application), but in most cases, everything is pretty straightforward.

     
    Balanced (stereo) operation.
    This also requires 4 output U.FL connectors and firmware.

    This makes the unit (or board) operate as one channel balanced D/A stage, while the second balanced channel is available as PCM digital output. This also obviously takes another board for D/A conversion, for stereo operation.

    Hence we made such a “package” available for ordering too. It includes one board with USB, D/A and output stage, a second board with D/A and output stage, and transformer with all the windings necessary to feed both these boards.

     
    If necessary, all these optional features can be installed afterward, with a bit of soldering (it is not a lot of parts, even though they are all SMD), and by applying an adequate firmware update (update files are provided), via Windows control panel.

    HTH


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