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Old 28th March 2019, 06:45 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
Attached Images
File Type: jpg es0.jpg (300.0 KB, 315 views)
File Type: jpg es1.jpg (384.0 KB, 315 views)
File Type: jpg es2.jpg (686.7 KB, 305 views)
File Type: jpg es3.jpg (643.7 KB, 291 views)
File Type: jpg es4.jpg (602.8 KB, 282 views)
File Type: jpg es5.jpg (706.9 KB, 195 views)
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Old 29th March 2019, 08:19 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, 07:11 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, 104 views)
File Type: jpg IMG_20190406_160152.jpg (155.0 KB, 62 views)
If you can see the speaker cone move...it's not hifi.
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