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Old 12th November 2013, 01:26 PM   #1
sesebe is online now sesebe  Romania
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Default My second try on digital side

Hello,

This are my last DAC. The pictures are self speaking.

First pictures are with test boards single side and the last are with the finished pcb, double side. The last one it is the block diagram.
Attached Images
File Type: jpg First PCB (Ver75).jpg (456.1 KB, 210 views)
File Type: jpg Picture 004_.jpg (220.1 KB, 204 views)
File Type: jpg P1160733.JPG (800.4 KB, 199 views)
File Type: jpg P1160737.JPG (812.6 KB, 185 views)
File Type: jpg P1160738.JPG (785.3 KB, 180 views)
File Type: jpg P1160739.JPG (784.1 KB, 97 views)
File Type: jpg P1160742.JPG (768.0 KB, 98 views)
File Type: jpg P1160747.JPG (519.2 KB, 125 views)
File Type: png Block Diagram.png (41.8 KB, 131 views)
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Old 12th November 2013, 01:45 PM   #2
sesebe is online now sesebe  Romania
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It has remote control (programable thru service menu) and the local control was change from push butons to rotary encoder fro volume and integrated push buton for changing the input source.

I forgote these photos:
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File Type: jpg P1160744.JPG (679.1 KB, 127 views)
File Type: jpg P1160745.JPG (759.9 KB, 86 views)
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Old 12th November 2013, 04:31 PM   #3
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Quite impressive, that is what I call true DIY

Why that high speed isolator? Wouldn't a single one for the µcontroller suffice?
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Old 12th November 2013, 04:52 PM   #4
sesebe is online now sesebe  Romania
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Hi,

I forgot to mention that the output analog part are galvanically isolated from the digital input part. I used galvanic isolation to cut any ground loop that can occur and any noise that can be transmitted from digital schematic side to analog side through the ground.

The high speed izolator are for data and low speed are for commands. The data clock for digital filter are as high as 24.576MHz.
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Old 12th November 2013, 05:13 PM   #5
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What type of high speed isolator are you using? You have considered it's propagation delay, I assume.

Are your PCBs made in Romania?
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Old 12th November 2013, 05:33 PM   #6
sesebe is online now sesebe  Romania
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Yes .... and

I do not understood exactly yous questions regarding propagation delay, but yes. The propagation delay are the same on all data lines and it is not so important the exact values or how big are. The commands from µController are not time connected to signal from data lines.

The PCB are made in Romania. Was very expensive, more that I expected, but the quality are god.

I'm not a fan of audio grade expensive components, only god quality from verified source. It can be seen on PCB this.

The components are noted on block diagram.

Last edited by sesebe; 12th November 2013 at 05:35 PM.
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Old 28th February 2014, 07:21 PM   #7
catalin is offline catalin  Romania
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Superb work and project Sesebe !
Congrat's !
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"please try to listen to some music through the amplifier instead. Life is so short ..."
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Old 24th July 2014, 02:00 PM   #8
sesebe is online now sesebe  Romania
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I remain with some PCB and I already work to another version.

To sound of this DACit is very detaliated and the stage image is the best of all DAC I have listened ( it is true that they were not the first in the charts).

If somebody are interesed, please send me a mesage.

Last edited by sesebe; 24th July 2014 at 02:21 PM.
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