I have used Voyage Mubox for the Raspberry Pi as well as Volumio for the Raspberry Pi with Soren's DAC. Both via i2S (i.e, no USB or SPDIF interface). Have not used piCoreplayer.
Thanks, I got it working this way.
I had interpreted the instruction in the form that "1021filt" was only a template for the filename and gave different filter sources different names.
But if the produced .skr is renamed and uploaded to the DAM102, the DAM will recognize this as new filter settings, yes?
For the Mac(UNIX?)-people if you instal Wine, mkrom can be executed by typing in the terminal "wine mkrom 1021filt".
yes. the name is irrelevant, as the dam1021 only "sees" the uploaded binary data. The .skr files have a header that starts with a soekris ID, file size, and then a string that is consistently the same between filter files and different in the FPGA file. I'd assume this is used by the uManager firmware to determine the function of the uploaded file.
Hi there.
Trying to test with i2s in from this Gustard U12 and hdmi(lvds) to i2s connection.
I actually god "lock" on the signals the soekris dac but no sound. Dead silent
External 3.3v is connected to the isolated i2s side of the dam1021 and to the hdmi-i2s receiver.
EDIT: Well... turning the amplifier ON helps every time..
My goodness... Yes we got sound.. 🙄😀
Best regards.
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Soren,
for the filter header:
I had a filter with multiplier 0.9 which resulted in no output (multiplier 1 worked, also multipliers 1.1 etc).
If so could it be changed with the firmware update so that the multiplier gets a double. That would ease life ... you would not need to multiply all coefficients.
for the filter header:
it seems that the multiplier is treated as integer, true?
I had a filter with multiplier 0.9 which resulted in no output (multiplier 1 worked, also multipliers 1.1 etc).
If so could it be changed with the firmware update so that the multiplier gets a double. That would ease life ... you would not need to multiply all coefficients.
It's a TI TPS562209, but please note that if you killed that part it's likely that the FPGA also died....
from hifiduino
this fellow is answering one of my questions (#1920):
INITIAL POWER MODS
The power on/off POP seems benign if listening through headphones. The power-on pop is not loud at all. The power off pop is loud. If connected directly to an amplifier, it can potentially damage the loud speakers.
During Power off, the positive rail drops faster than the negative rail and this creates a voltage imbalance resulting in a huge POP. At some point, the device is practically powered by the negative rail...
https //hifiduino wordpress com/2015/02/22/dam1021-r-2r-dac-mods/
i'm just a beginner but i wonder if i use a rectification of 3v 0 3v center tap
that gives me 8.10 dc does it cure the voltage imbalance (that seems to be happening when the 7v 0 AC is used)
thanks
Martin
this fellow is answering one of my questions (#1920):
INITIAL POWER MODS
The power on/off POP seems benign if listening through headphones. The power-on pop is not loud at all. The power off pop is loud. If connected directly to an amplifier, it can potentially damage the loud speakers.
During Power off, the positive rail drops faster than the negative rail and this creates a voltage imbalance resulting in a huge POP. At some point, the device is practically powered by the negative rail...
https //hifiduino wordpress com/2015/02/22/dam1021-r-2r-dac-mods/
i'm just a beginner but i wonder if i use a rectification of 3v 0 3v center tap
that gives me 8.10 dc does it cure the voltage imbalance (that seems to be happening when the 7v 0 AC is used)
thanks
Martin
One more question for Soekris is there a problem to have the board powered on all the time (24-7).
And if you can please answer my previous question is it in your plans to fix the gab in the locking or it is impossible to correct?
Thank you for the answer
And if you can please answer my previous question is it in your plans to fix the gab in the locking or it is impossible to correct?
Thank you for the answer
3v AC will give you about 4.5 v DC. But that is unrelated to balancing the power draw at power off. The best you can do is make the Pop a bit softer. The real solution is to cut the output before the power rails start sagging
Same here. Running 24/7 to avoid dealing with shutdown pops. Power from a 2x7vac transformer.
The DAC runs very cool - I can't detect any warmth to the case beyond ambient even in +30°C conditions.
Someone on another forum even suggested that running the DAC 24/7 might be beneficial to sound quality. 🙂