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Old 10th June 2017, 11:41 AM   #241
mravlca is offline mravlca  Slovenia
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Default Transient DAC two

DAC with Transient modules and DIYINHK 768kHz isolated. Under Transient modules LM317 and LM337 were replaced with TPS7A4700 and TPS7A3301. Isolated part of USB DAC is powered by TPS7A4700 and digital part of Transient modules is powered by LT3045.
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Old 10th June 2017, 01:58 PM   #242
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Quote:
Originally Posted by lemon View Post
This is my favorite dac, LemonDAC.

Wolfson WM8805 receiver, Sabre9023P DAC, Atmega1284p Controller.
Salas pre-regulator, 8 super low noise dc-dc converters (LT3042, TPS7A4700x)
Individual PSU for controller, display and usb receiver.
The engraving of the case has be made on a diy CNC.
Lemon, your DIY project DAC is as attractive and well finished as any commerical DAC I've seen. While reminiscent of Wadia industrial design, I feel that yours is actually better looking.

Please share the story of it's construction, especially the case design, and the microcontroller firmware development story.
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Old 11th June 2017, 01:49 PM   #243
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Default My final destination

My DAC have become a complex of digital channel divider and power amp after several trial and error.
The very reason is analogue interconnection between DAC,channel divider and amp degrades the signal quality most.

Now I connect digitaly from transport with SD card to DAC through optical SPDIF.No analogue cable exists except speaker cable.

Power is from LIFe4PO battery which can be charged by the DAC board.Power amp is classA BTL which gurantees direct current only from the battery.

Power voltage,offset voltage,current and temperature are constantly monitored.In case they are out of order,power goes off instantly.I think protection is very important for power amp.

I'm sure this is the goal.Now is the time for listening not for making.

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Old 12th June 2017, 05:55 AM   #244
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I forgot to describe DAC chips.When I started self-made,I used pcm1704 and df1706 ,which were the stereotype around 2000.
I redesigned my DAC along with listening room 7 years ago.I made PCB which had pcm1704 and pcm1796 to compare them on the same conditions.

After carefully listening, I decided to choose pcm1704.Bass is more stout than pcm1796. The very reason is I can't examine inside pcm1796 which is a black box. A black box is often fatal for a self-made DAC.From that point,My DAC still uses multibit pcm1704.

I needed to search a replacement for pcm1704 two years ago because pcm1704 became obsolete.There are some multibit precise DACs.I selected LTC2642 among them.FPGA on the board arranges their different pin assignment.

FPGA also has 1st order sigma-delta moduration which can easily improve resolution of LTC2642(16bit) to around 20bit.I think 20bit is practically adequate enough.

I compared them like pcm1704 and pcm1796. Pcm1704 sounded wet like film-based camera,LTC2642 was dry like digital camera. I prefered wet pcm1704 to LTC2642.But LTC2642 were acceptable for a replacement.

That's my history about DAC.My final version can use both pcm1704 and LTC2642.I think LTC2642 can be a replacement for pcm1704.
Liniality of LTC2642 improved by sigma-delta modulation is better than pcm1704K. Pcm1704 is better than LTC2642 below -72dBFS level.

Both have T.H.D around -100dBFS which is inferior to sigma-delta (-120dBFS).I don't care much about T.H.D.Because speakers have much more T.H.D.(at least -40dBFS). -100dBFS is good enough.
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Old 14th June 2017, 03:32 PM   #245
lemon is offline lemon  Greece
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Quote:
Originally Posted by Ken Newton View Post
Lemon, your DIY project DAC is as attractive and well finished as any commerical DAC I've seen. While reminiscent of Wadia industrial design, I feel that yours is actually better looking.

Please share the story of it's construction, especially the case design, and the microcontroller firmware development story.
Ken thanks for your positive vote to my dac.
ASAP, I will upload some of the construction tips and what I have done with the software.
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Old 15th June 2017, 05:38 AM   #246
dddac is offline dddac  Germany
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Originally Posted by lemon View Post
Ken thanks for your positive vote to my dac.
ASAP, I will upload some of the construction tips and what I have done with the software.
could you make a thread for that? to keep this thread more general and lean?
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