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Old 20th February 2017, 07:26 PM   #231
lemon is offline lemon  Greece
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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.

Outside view of the dac: https://www.youtube.com/watch?v=X17KfZySgdM

Inside view of the dac: https://www.youtube.com/watch?v=FjdAndnm-o0
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Old 20th February 2017, 07:48 PM   #232
Torchwood421 is offline Torchwood421  United States
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Location: Prior Lake, MN
Thumbs up Lemon DAC

That is a beautiful project!
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Old 28th April 2017, 09:59 AM   #233
MarcelvdG is online now MarcelvdG  Netherlands
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Location: Haarlem, the Netherlands
This is my valve DAC: DIX4192 SPDIF interface, Spartan 6 FPGA module and SRC4392 for the digital signal processing, three times E88CC per channel as the actual DAC, 85A2 voltage reference, ECC81 crystal oscillator, two EF80 clock buffers, potcores and polystyrene capacitors as reconstruction filter. See https://linearaudio.net/articles?title=The+valve+DAC and https://linearaudio.net/downloads for details. By the way, I replaced the large transformer with two 50 VA toroids.
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Old 29th April 2017, 11:44 AM   #234
kazap is offline kazap
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Quote:
Originally Posted by MarcelvdG View Post
This is my valve DAC......
Nice. How does it sound?
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Old 30th April 2017, 12:15 PM   #235
MarcelvdG is online now MarcelvdG  Netherlands
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Quote:
Originally Posted by kazap View Post
Nice. How does it sound?
The first time I seriously listened to it, early September last year, I played a CD with Vivaldi's Nisit Dominus performed by Le Banquet Celeste. The output of the DAC was connected to a Technics SU-V40 amplifier (solid state) which drove a pair of Sennheiser HD-215 headphones.

I was really impressed by how beautiful it sounded. It was almost as beautiful as during their concert at the old music festival in Utrecht in August 2016.

In my opinion this mainly shows that I'm a fan of Le Banquet Celeste. I can't possibly say if I would have been any less impressed if someone would have secretly replaced the DAC with any other well-designed and level-matched DAC.
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Old 30th April 2017, 12:23 PM   #236
McGyver is offline McGyver  Poland
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It seems now is the time to make a well designed tube amplifier.
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Old 30th April 2017, 01:19 PM   #237
MarcelvdG is online now MarcelvdG  Netherlands
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I was thinking about a valve ADC, but I will probably never build it because I haven't got anything to record with it anyway.

Last edited by MarcelvdG; 30th April 2017 at 01:21 PM.
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Old 1st May 2017, 03:13 AM   #238
kazap is offline kazap
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Quote:
Originally Posted by MarcelvdG View Post
The first time I seriously listened to it, early September last year, I played a CD with Vivaldi's Nisit Dominus performed by Le Banquet Celeste. The output of the DAC was connected to a Technics SU-V40 amplifier (solid state) which drove a pair of Sennheiser HD-215 headphones.

I was really impressed by how beautiful it sounded. It was almost as beautiful as during their concert at the old music festival in Utrecht in August 2016.

In my opinion this mainly shows that I'm a fan of Le Banquet Celeste. I can't possibly say if I would have been any less impressed if someone would have secretly replaced the DAC with any other well-designed and level-matched DAC.
Thanks for the recommendation for Le Banquet Celeste. I has a quick listen on Youtube
https://www.youtube.com/watch?v=16j5BvJX0VE
https://www.youtube.com/watch?v=Djq4NJXZo5M
and was impressed.

Your DIY DSD valve DAC must be fine with it sounding so close to the live concert. I wonder how hard the build is?
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Old 1st May 2017, 05:24 AM   #239
MarcelvdG is online now MarcelvdG  Netherlands
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Quote:
Originally Posted by kazap View Post
Thanks for the recommendation for Le Banquet Celeste. I has a quick listen on Youtube
https://www.youtube.com/watch?v=16j5BvJX0VE
https://www.youtube.com/watch?v=Djq4NJXZo5M
and was impressed.

Your DIY DSD valve DAC must be fine with it sounding so close to the live concert. I wonder how hard the build is?
It took me about three and a half years to design, build, debug and improve it, but making a second one would of course be much less work. The FPGA configuration files and PCB layouts including all the latest improvements are available on the Linear Audio website, so have a look if you are interested. You need to solder some fine-pitched SMD components, although I've used relatively large SMDs wherever possible.

By the way, it is not really a DSD DAC, although it does support DoP. Basically anything that comes in is converted to 200 kHz sample rate PCM, interpolated to 3 MHz PCM and then converted into a 27 MHz single-bit signal. You can choose between three algorithms for the conversion to single bit; in the mode that works best, this last conversion involves a special kind of pulse width modulator embedded in a sigma-delta modulator loop. The advantage of this is that the loop can be properly dithered, which prevents all the idle tone problems you would otherwise have with a sigma-delta.
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Old 2nd May 2017, 09:15 AM   #240
Dimdim is offline Dimdim  Greece
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This is by far one of the most interesting DAC projects that I have seen going around. Congrats!
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