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AK4490 USB Dac with dsd support.

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sonnya

sonnya

Member
Joined 2001
mirand-audio.dk/?post_type=product
Regarding the DAC V1.2 i have made some changes to the oscillator because it was simply not good enough.

I have added low pass filtering on the powersupply and i am going to give the oscillators there own ground reference today because they sit on top of the U43 44 TQFP (Shown in the attached picture).. And i am sure that is the source for the problems.

So later today i will upload a picture of the same position showing the ground plane for the oscillators.
 

Attachments

  • mirand DAC V1.2 U43.png
    mirand DAC V1.2 U43.png
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sonnya

sonnya

Member
Joined 2001
mirand-audio.dk/?post_type=product
More MIRAND A1 V1.2 Measurement.

They are done with 25mA bias. 10mV across the measurement points.
 

Attachments

  • mirand a1 v12 27W 1khz 8R - 2 25mA bias.pdf
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  • mirand a1 v12 8vrms 1khz no load.pdf
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  • mirand a1 v12 8vrms 1khz 8R - 3 25mA bias.pdf
    432.1 KB · Views: 55
  • mirand a1 v12 4vrms 1khz no load - 3 25mA bias.pdf
    326.5 KB · Views: 56
  • mirand a1 v12 4vrms 1khz 8R - 3 25mA bias.pdf
    375.4 KB · Views: 55
sonnya

sonnya

Member
Joined 2001
mirand-audio.dk/?post_type=product
Delivery time and prices

I got asked today how thing looks like regarding delivery.

Updated USB DAC V1.2a with new clock domain and AK4493 (Minor changes need for the AK4493): We will receive 20 boards (7 sold, 13 left) board week 42 shipment week 43.
New/modified Gain Module : We have 28 pcs left but we will receive 40 boards (30 sold, 38 left) in week 42. So shipment in week 43
Shield board for the discrete output stage : 1 in stock, We will receive 20 boards (8 sold, 13 left) week 42 shipment week 43
New Balanced Preamp (which will be changed to use gain modules that we also use for DAC) : We will receive 20 boards (3 sold, 17 left) Delivery week 42 shipment week 43
MIRAND A1 V1.2 amplifier : 44 boards in stock, 4 sold, extra 10 ready to ship.

Gain module : 80€/pcs
Modification of old gain modules : 20€/pcs
Shield board with 2 x gainmodules for SE: 160€ (Shield for free)
Shield board with 4 x gainmodules for XLR: 320€ (Shield for free)
USB, SPDIF, I2S DAC Board AK4493 DAC V1.2a : 426€
USB DAC Board AK4493 DAC V1.0a : 199€
Preamp with 6 gainmodules : 520€
MIRAND A1 V1.2 : 199€/channel
 
A

Aboe

Member
Joined 2015
The new gain modules

Sonny has upgraded my gain modules, and there are really better than the old ones, which I loved. I have had them for almost a week, and they did really open up, after a few days. In short terms I would say, that they sound more analog. The top is has much more definition, and soft at the same time. And their perspective has grown a little. And they sound has got a little more body.

So well done Sonny :)
 
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