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Old 26th October 2016, 03:51 PM   #221
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Nice work, can you detail all the boards used?
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Old 26th October 2016, 07:17 PM   #222
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Quote:
Originally Posted by Malefoda View Post
Nice work, can you detail all the boards used?
Sure,
It starts with an RPI, with Ian's little U.FL adapter on it, 3 coax goes to Ian's I2S FIFO than I2StoPCM board. Those are stacked on each other. Than my little DAC board comes, that is version x of my AD1865 boards. I found LM431 power supplies on board to be a good solution. I have 2 of them on the board, for the analog +- and the digit +.
The DAC runs in current mode, the termination resistors are not visible, under interstage the transformers on the analog board. The analog board is not a PCBA, it is just a cnc cut board, the traces are wires. The analog amplification has tube rectification and AN copper foil caps on output. In the middle, there is the tube filament power supply board with additional RC filtering. The toroid feeds that and the tub rectifier of the analog amplifier.
There are 2 more power supply boards, one has a dual output about 9V and a single 9V for the DAC board analog and digit board (not 5, because there is regulation on the DAC board). Last, between the toroid and the DAC PSU on the right, there is a 5V supply for the PI and the digital line boards.
I need to replace the toroid.
Than I will replace the DAC board to analog board and the analog board to cinch connector analog cables to AN KSL cables.
And the tubes too. At the moment I have old used tubes from my drawer, I will get some new tubes into it.

Regards,
JG
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Old 26th October 2016, 09:55 PM   #223
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Thanks, very inspiring.
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Old 3rd November 2016, 04:00 PM   #224
easphyx is offline easphyx  Bulgaria
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Click the image to open in full size.

Click the image to open in full size.

PCM2707 + PCM1793 + OPA2134 for post-DAC filter + LMH6643 power op amp for headphone output.

Negative rail is provided by LM2662MX (modern more powerful version of ICL7660) switched-capacitor converter. Both negative and positive voltages are filtered via damped (Q about 1) LC filters.

Full project data: https://github.com/e-asphyx/usb_dac
Attached Files
File Type: pdf DAC.pdf (83.8 KB, 17 views)
File Type: pdf board.pdf (101.7 KB, 13 views)
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Old 27th November 2016, 11:41 PM   #225
McGyver is offline McGyver  Poland
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The latest implementation of my PCM1794 based tube output DAC:

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Digital filter SLOW/SHARP switch:

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Old 18th December 2016, 11:51 PM   #226
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Originally Posted by McGyver View Post
The latest implementation of my PCM1794 based tube output DAC:
What schematic and tubes did you use for the PCM1794 output?
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Old 19th December 2016, 01:18 AM   #227
sesebe is offline sesebe  Romania
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My creations has photos here: My second try on digital side
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