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AK4490 USB Dac with dsd support.

We did a last minute update to the dac.. It made it perform better at 384khz 32 bit...

Also software is tested using Windows 10 and volumio.

In volumio it plays Native DSD 256.
 

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Hi all. I am working hard on the documents.

But i have given an overview of the connectors on the board. And it is very versatile.

Have a look. And feel free to ask.

The u.fl. to I2s will fit on J8 and accepts I2S PCM only up to 192KHz/24Bit.
USB is up to PCM 384KHz/32Bit and DOP128 or DSD256 (Native)
RX2 and RX4 on J23 is up to 192KHz/24Bit. They are not enabled in the software but it is easy done.
 

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Last edited:
Hi all. I am working hard on the documents.

But i have given an overview of the connectors on the board. And it is very versatile.

Have a look. And feel free to ask.

The u.fl. to I2s will fit on J8 and accepts I2S PCM only up to 192KHz/24Bit.
USB is up to PCM 384KHz/32Bit and DOP128 or DSD256 (Native)
RX2 and RX4 on J23 is up to 192KHz/24Bit. They are not enabled in the software but it is easy done.

Sonnya,

looking at the picture could you elaborate more on J13 pins?
It is a 3 pin connector, one pin is “…open drain output for switching ON-OFF external PSU…” as you wrote.
My understanding is that this pin is normally floating and that DAC V1.2 can put this pin to ground, but it is not clear what kind of event triggers it.
Maybe a signal on one of the inputs (usb – spdif- toslink) ?
Please explain.
Thanks.
 
Sonnya,

looking at the picture could you elaborate more on J13 pins?
It is a 3 pin connector, one pin is “…open drain output for switching ON-OFF external PSU…” as you wrote.
My understanding is that this pin is normally floating and that DAC V1.2 can put this pin to ground, but it is not clear what kind of event triggers it.
Maybe a signal on one of the inputs (usb – spdif- toslink) ?
Please explain.
Thanks.


I have attached a schematic of that section.

J13 and J11 is taken directly across U15 DC/DC converter. If that is to noisy for your taste, you can provide an external power source.

J13 can drive a relay with 5V coil. Just remember the diode (1N4148/1N4004 - 1N4007 .. any standard diode) across the relay coil or the mosfet gets destroyed. (J13:1 +5V, J13:2 Enable by shorting J13:2 to GND through the mosfet, J13:3 GND)

The schematic shows how to connect an external power source.
 

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