I had all of the OPS for this DAC (3 of them). The first discrete OPS that came out was a big step over the opamp OPS. I'm wondering how much of a step up the newer discrete is over the previous discrete OPS??
Let's find out
Do
While the old one is good and originally did not have issues and was satisfied..
Still, to be honest, there is no contest between the two.
We did not find any need to make direct comparisons..
(More than swap out in place, which took not more than a minute or so)
(And we did it repeatedly)
Ciao, George
Still, to be honest, there is no contest between the two.
We did not find any need to make direct comparisons..
(More than swap out in place, which took not more than a minute or so)
(And we did it repeatedly)
Ciao, George
You are comparing the original discrete shield (that followed the opamp based shield) and the latest shield with the gain stage modules, right? BR, Per
Joseph, I remember you did some nice measurements of the first discrete output stage (AK4490 USB Dac with dsd support.). It would be interesting to see how the new one fares, could you run some analyses for us?
Yes, I could. I do actually have quite an amount of data about the new/old output stage, and new / old dac..
I do not have the direct comparison 'charts' referring exactly to your question, between the new /old stage on the same dac.
I'm also traveling, so can not have easy access right now. Next week..
I could tell my impression, but it will be much better with data..
Ciao, George
I do not have the direct comparison 'charts' referring exactly to your question, between the new /old stage on the same dac.
I'm also traveling, so can not have easy access right now. Next week..
I could tell my impression, but it will be much better with data..
Ciao, George
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USB DAC V1.2 I2S port
I2S connector J8.
For using the I2S input we need to connect to the J8 10 pole IDC connector.
The Level is CMOS 3.3V
Pin 2,4,6,8,10 is GND.
pin 1 is a +3.3V which is also used for the Samplerate converter SRC4392.
If you choose to use the +3.3V please feed it through an ferritebead and a 10uF X7R capacitor to GND. it is aloevable to draw 75mA from the +3.3V on the J8 connector.
Pin 3 is SDOUT
Pin 5 is SDIN
Pin 7 is LRCK
Pin 9 is BCK
This I2S port run as a slave at up to 192KHz and 24Bit. So any source should supply this port with BCK and LRCK to get it functioning.
I2S connector J8.
For using the I2S input we need to connect to the J8 10 pole IDC connector.
The Level is CMOS 3.3V
Pin 2,4,6,8,10 is GND.
pin 1 is a +3.3V which is also used for the Samplerate converter SRC4392.
If you choose to use the +3.3V please feed it through an ferritebead and a 10uF X7R capacitor to GND. it is aloevable to draw 75mA from the +3.3V on the J8 connector.
Pin 3 is SDOUT
Pin 5 is SDIN
Pin 7 is LRCK
Pin 9 is BCK
This I2S port run as a slave at up to 192KHz and 24Bit. So any source should supply this port with BCK and LRCK to get it functioning.
Pin 1 is +5.5V or at least 5.2V
Pin 2, 4 is GND
Pin 3 is +15V
Pin 5 is -15V
Regarding stacking two OPS on to of the DAC is possible but the loading of the DAC will be to low and the sound signature of the DAC will change.
BR
Sonny
USB DAC V1.2 mainboard spec.
Specification on the USB DAC mainboard.
Specification on the USB DAC mainboard.
- Powersupply: +5.5V 340mA, +15V 10mA, -15V 1mA.
- Samplerate converter SRC4392 on I2S, SPDIF RCA and Optical SPDIF
- Samplerate converter output is 192KHz 24Bit.
- I2S and RCA SPDIF to 192KHz 24 Bit.
- Optical to 96KHz and 24Bit
- USB to 384KHz 32bit and DOP 128
- USB is galvanic isolated and feed directly to AK4490
- All signals are reclocked
- FPGA for glue logic
- Own microcontroller for controlling different types of Volume control
- Optional control of preamp through FFC 30 pin connector.
- 3 SERCOM ports (SPI,I2C or UART per SERCOM), IR, encoder and 6 GPIO, +5, +3.3V through the DDC connector
- Firmware for using DAC with OLED display.
- Same formfactor as the USB DAC V1.0
Hi Sonny,
The new DAC is really doing a fine job - the best I have ever heard!
The link to firmware for DAC with simple frontpanel is not working. I installed firmware for OLED panel and for DAC with OLED panel. Adjusting volume is shown on the display, but the DAC is running at 100 %, not responding to the adjustments. Any hints?
All the best, Erik