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Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Audio GD DA-M1 R2R Dac Module
Audio GD DA-M1 R2R Dac Module
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Old 26th May 2017, 06:30 PM   #41
Ben Mah is online now Ben Mah  Canada
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Join Date: May 2012
Location: Vancouver
Since I had the boards out of my system, I decided to do a bit of work and provide separate digital and analog power supplies. I used the TPS7A regulated supply to power the digital side of all four boards and then I added a TL431 regulated supply to power the analog side of all four boards. The supplies were independent of each other with their own transformers.

With this setup back in the system in place of my TDA1541a board, the harshness that I heard with only one power supply feeding both the analog and digital sides has disappeared. The sound is now very similar to my TDA1541a but I think the TDA1541a sounds a bit more rounded, maybe because it has a tube ouput stage since the chip output voltage is very low, or it could be because of other reasons. The DA-M1 boards have enough voltage output so an output stage is not required.
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Old 26th May 2017, 07:01 PM   #42
rickmcinnis is offline rickmcinnis  United States
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Join Date: Jun 2006
Ben Mah,

THANKS for your report! Now I must get to work on my boards.

It makes good sense to me, as it always seems to make a good difference, to have as many separate power supplies as possible.

Take care,
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Rick McInnis
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Old 10th November 2017, 12:07 PM   #43
rotulet is offline rotulet
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Join Date: Nov 2017
Default DA-M1 newbee questions

Hi everyone!

I have some questions about the DA-M1 integration:
  • why it needs 2 power supplies (3.3V for analog and digital)?
  • does anyone have a part list for the output stage with nice and good components?
  • I intent to connect theses 2 (or 4, I am still undecided) beasts to a Raspberry PI via I2S. What will be the kind of driver I should use?
Thanks!
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