Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz - Page 112 - diyAudio
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Old 28th January 2015, 03:00 PM   #1111
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Quote:
Originally Posted by soekris View Post
4) Full set of relative simple and short FIR filters for all rates, but supports filters with up to 1016 coefficients at 48K. Docs and Software Utility to change them included...
Not included w. my board. That's okay. I can wait.
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Old 28th January 2015, 03:20 PM   #1112
soekris is offline soekris  Denmark
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Quote:
Originally Posted by oneoclock View Post
Input impedance is 330 Oh.

Should we don´t use a standard transformer 1: 1 or 1.21: 1?

Is this the best option?
2:1 transformer for SPDIF (75:330)
1,73:1 transformer AES / EBU (110:330).
Schematics based an any 1:1 spdif transformer.
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Old 28th January 2015, 04:17 PM   #1113
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Originally Posted by SebastianL View Post
Not included w. my board. That's okay. I can wait.
Mine neither, can wait as well
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Old 28th January 2015, 04:25 PM   #1114
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I was asked by a friend who has an XMOS OEM board which requires external master clock if that could be made to work the the DAM1201 - is there a way to send the clock to the USB to I2S board? (link to the board: OEM board - I2S over USB Audio )
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Old 28th January 2015, 04:48 PM   #1115
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Originally Posted by Nikola Krivorov View Post
I was asked by a friend who has an XMOS OEM board which requires external master clock if that could be made to work the the DAM1201 - is there a way to send the clock to the USB to I2S board? (link to the board: OEM board - I2S over USB Audio )
I was looking at these oems over the last few days too and wondering the same
Will most usb to i2s interfaces have many features not of use or benefit for this dac?
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Old 28th January 2015, 05:35 PM   #1116
soekris is offline soekris  Denmark
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I have a new version of the FPGA firmware where the mute function should work much better, could somebody with the Amanero USB interface please try it ?

1) Download and unzip attached file 1021fpga_090.zip
2) Connect the dam1021 serial port to a PC serial port with a terminal program (I use HyperTerminal), set for 115200,n,8,1, no handshake.
3) Enter uManager on dam1021 by typing "+++" followed by a 1 second pause.
4) Type "download" and start sending file from the terminal program using 1K X-modem protocol.

Power cycle when done, you can verify by entering uManager again, FPGA revision should then be 0.9.
Attached Files
File Type: zip 1021fpga_090.zip (60.1 KB, 384 views)
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Old 28th January 2015, 07:04 PM   #1117
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SebastianL,

I could not help but think you are describing the effect of incorrect polarity.

If you have a way to invert polarity (which everyone should) I bet that recording might sound just fine.

Wish all resolving gear would include a polarity switch!

This DAC not having a balanced output makes it impossible to change polarity with a switch on the output.

Maybe your player has this function.

Maybe SOEKRIS can incorporate this into the firmware? Sure would be a boon to enjoyment of ALL recordings.
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Old 28th January 2015, 09:12 PM   #1118
bappe is offline bappe  Sweden
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Quote:
Originally Posted by rickmcinnis View Post
...This DAC not having a balanced output...
Yes it does

//Anders

Got mine today BTW
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Old 28th January 2015, 09:41 PM   #1119
soekris is offline soekris  Denmark
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Quote:
Originally Posted by Nikola Krivorov View Post
I was asked by a friend who has an XMOS OEM board which requires external master clock if that could be made to work the the DAM1201 - is there a way to send the clock to the USB to I2S board? (link to the board: OEM board - I2S over USB Audio )
Will come in later firmware release.
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Old 28th January 2015, 10:00 PM   #1120
potstip is offline potstip  Turkey
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Soren,

There is no 3.3v output in sdtrans384 i2s section as you can saw the picture here below,

Click the image to open in full size.

So,

How can i make connection between sdtrans and r-2r dac?

Sdtrans. R2r
Lrck. Lrck
Sdat. Dat
Dclk. Blck?
Mclk x

Can i feed 3.3v from external source?
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