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Old 28th March 2019, 07:45 PM   #321
Thorp is offline Thorp
diyAudio Member
Join Date: Jan 2013
This is my newest project, but it is the first who get a housing.
It is almost finished. I only have to polish the front plate and to make some measurements for the THD compensation coefficients: I hope to find a function between THD coeffs. and the digital volume values.
It is an USB DAC based on XMOS XUF208 and 2 x ES9018K2M.
- The oscillator is adjustable SI549 and it feeds the clock for DAC chips, but also MCLK for XMOS via 3.1 (3 x I2S lines out from XMOS and 1 x MCLK line in to XMOS) 150MHz isolator, so the DAC works in synchronous mode.
- There are two INDEL transformers 2X15vac 20VA plus 2x8vac coils each (I carefully made them by hand ). They are followed by 8 x LM317 pre-regulators, so all low noise (LT3042/45, ADM7150) LDOs get the right (minimum) input voltage in order to keep their temperature as low as possible.
- The main controller is based on STM32F103 "blue-pill" - inspired by Dimitris project : www.dimdim.gr It is also isolated via 2 x I2C isolators: one for XMOS and the other for the DAC chips.

You can watch a short video here: YouTube
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File Type: jpg es5.jpg (706.9 KB, 485 views)
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Old 29th March 2019, 09:19 AM   #322
Dimdim is offline Dimdim  Greece
diyAudio Member
Join Date: Sep 2008
Location: Athens
This is a very proper looking build! As custom as it gets!

I love it when I see my designs inspiring fellow DIYers to build their own projects, some of which look considerably better than my own.
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Old 6th April 2019, 08:11 PM   #323
Bas Horneman is offline Bas Horneman  Netherlands
diyAudio Moderator Emeritus
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Join Date: Apr 2002
Location: The Netherlands
Default RAKK DAC MK2

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File Type: jpg IMG_20190406_160035.jpg (126.9 KB, 364 views)
File Type: jpg IMG_20190406_160152.jpg (155.0 KB, 160 views)
If you can see the speaker cone move...it's not hifi.
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Old 14th June 2019, 08:31 PM   #324
Thorp is offline Thorp
diyAudio Member
Join Date: Jan 2013
Using pictures stored in the flash memory chip gives better looking results than using text .h files. It is a little more work to be done (precise crop) for the text and background synchronization, but the effort deserves.
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Old 13th July 2019, 08:48 PM   #325
Gregje is offline Gregje  United Kingdom
diyAudio Member
Join Date: Oct 2009
Location: London
This is my Rpi with Allo Boss DAC and double linear PS with LM350s.
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Old 26th September 2019, 07:10 PM   #326
lykkedk is offline lykkedk  Denmark
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Join Date: Dec 2002
Location: Denmark, Fredericia
Default DUAL AK4490


This is DimDim's & freind's design

It was a long journey getting here, but i had good help from DimDim getting here.

It's finally done, and it's perfect as is for now.

Some pictures from build also included

Rgds; Jesper.
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File Type: png Screenshot from 2019-09-26 17-21-52.png (663.7 KB, 156 views)
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DCG3 Dual DCSTB, AK4490 Dual SuperDAC
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
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