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AK4490 USB Dac with dsd support.
AK4490 USB Dac with dsd support.
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Old 13th July 2018, 02:49 PM   #1571
sonnya is offline sonnya  Denmark
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Dear DIY Audio Friends.

The Mirand A1 V1.2 is ready.

It is a 4 layer board and this amp is very good sounding and extremely quiet.

What we have done is that we have changed the Size to 120x80mm.
This have made it possible to add the DC and UnderVoltage protection to the amp.

We use Mosfet's with an on resistance of total 7.8mOhm making it possible to use them without heatsinks.

Secondly we have taken the Voltage regulators from the LPS V2.1 to make the +/-15V on the board..

The power supply i would suggest a minimum 300VA 2x24VAC and 2x22000uF

60.000uF and 500 - 600VA 2x32VAC or higher capacitor for an 100Watt amplifier.

It runs from +/-30VDC (1A max idle) to +/-50VDC (max 0.5A idle).. Idle is only suggestions but always take into account the heatsink cooling efficiency.

It can run stable at 100mA if you want to. That is 6 - 10Watt per channel in idle power.

Many options here.

I have attached a screenshot.

So key data:
  • Size : 120x80x40mm (LxWxH)
  • +/-30 to 50VDC
  • 50 - 100Watt @ 8 Ohm.
  • 2 Ohm Stable
  • Bandwidth : 800KHz
  • Only adjustment is bias current, DC servo integrated
  • DC and UV protection
  • Current feedback
  • SE input : 10KOhm
Attached Images
File Type: png mirand A1 V12.png (126.4 KB, 378 views)
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Old 13th July 2018, 02:53 PM   #1572
pinnocchio is offline pinnocchio  Canada
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Looking great Sonny!
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PREAMPs : AMB α10 + USSPA | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | USSA3 & 5 | TGM8 | VZ Audio NS OPS | NX Amp | FC-100
DACs : TPA BII + OPC's NTD1 I/V | Signalyst DSCv2 | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 14th July 2018, 12:58 AM   #1573
AnthonyA is offline AnthonyA
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Hi Sonny

What is the impedance of the Dac discrete op amp output?

Kindly advise
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Old 14th July 2018, 03:12 PM   #1574
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by AnthonyA View Post
Hi Sonny

What is the impedance of the Dac discrete op amp output?

Kindly advise
It is 10 ohm. Set by a 10ohm resistor.
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Old 29th July 2018, 07:14 AM   #1575
sonnya is offline sonnya  Denmark
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Hi updates regarding the usb dac v1.2:

We are today going to send a new revision of the board to production.

We have used a Xilinx cpld to replace LVC logic gates in the version 1.2 and we have seen some artifacts that was not present with the LVC gates. So we have changed the board to use LVC gates and in the same process we have updated the dac to AK4493.

We are still missing to send out dac’s And they have been delayed because of that. They will all recieve the new board.

We are also working on a 99€ dac that is powered by a usb wall plug. The delayed usb dac v1.2 will receive one as gift.
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Old 6th August 2018, 09:32 AM   #1576
sonnya is offline sonnya  Denmark
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The new Mirand A1 V1.2 boards has arrived today.
IMG_3602.JPG
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Old 6th August 2018, 09:38 AM   #1577
sonnya is offline sonnya  Denmark
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Just to be sure that everyone knows. The MIRAND A1 V1.2 is the new amplifier boards.

They are densely packed as one can see.

- Sonny
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Old 6th August 2018, 11:25 AM   #1578
vgeorge is offline vgeorge  Greece
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AK4490 USB Dac with dsd support.
Looks good Sonny!
When ready let me know.
I think I am going to try them, hoping they are better than your TSSA
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Old 10th August 2018, 09:11 AM   #1579
sonnya is offline sonnya  Denmark
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MIRAND A1 V12 specs.

I have attached scope shots.

Measured slew rate is 200V/uSec.
Bandwidth 800KHz.
Distortion at +/-31V and 40Watt into 8 Ohm. <0.01%
Distortion at +/-31V and 80Watt into 4 Ohm. <0.01%

Bias during test : 35mA
total current consumption :100mA
Power disipation : 6,2Watt at +/-31VDC.

DC protection is tested and starts to kick in below 5 Hz. Above it does not limit.

Undervoltage lockout is below +/-21VDC
Attached Images
File Type: png scope_4.png (29.2 KB, 109 views)
File Type: png scope_5.png (25.1 KB, 108 views)
File Type: png scope_6.png (30.2 KB, 96 views)
File Type: png scope_7.png (31.1 KB, 93 views)
File Type: png scope_8.png (23.3 KB, 17 views)
File Type: png scope_9.png (23.5 KB, 17 views)
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Old 10th August 2018, 09:22 AM   #1580
sonnya is offline sonnya  Denmark
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IMG_3609.JPG

This is How it looks. Only trimming is bias.
And running very stable.

It is set not to break any records. But to be stable. Still it performs very well.
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