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Old 3rd August 2013, 05:40 PM   #1
JanErik is offline JanErik  Finland
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Default JEDAC - yet another take on a DIY high-end USB Audio DAC

As has been discussed in a few threads, I have been putting together a hobbyist-friendly USB DAC.

Based on PCM2707, PCM1794 and OPA4134, some references have been used from PupDAC, PupDAC Overview .

Other highlights are:
Single-sided PCB suitable for toner transfer.
All passives hole-mount.
Opamp runs on +-5V, allowing for better headroom and larger selection of opamps.
Quad outputs, since I have had enough of splitter cables (desktop system, subwoofer, livingroom cabinets).

Project page so far here: JEDAC - yet another take on a DIY high-end USB Audio DAC

PCB design and construction pics will be up "at some point".

The DAC has now been entirely assembled and is feeding my system. Sounds OK. Difficult to hear a difference from the simple PCM2705 internal DAC though.

Last edited by JanErik; 3rd August 2013 at 05:45 PM.
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Old 6th August 2013, 12:23 PM   #2
marce is offline marce  United Kingdom
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I don't wish to sound negative, but you really cannot do a "High End" design on a single sided PCB, only a budget design.
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Old 15th August 2013, 08:28 PM   #3
JanErik is offline JanErik  Finland
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Project page is now updated with schematics, PCB design and build pictures...
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Old 13th September 2013, 02:43 PM   #4
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Do you plan on releasing a printed PCB?
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Old 13th September 2013, 05:52 PM   #5
Julf is offline Julf  Europe
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Quote:
Originally Posted by marce View Post
I don't wish to sound negative, but you really cannot do a "High End" design on a single sided PCB, only a budget design.
How does the difference between single-sided and double-sided sound?
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Old 13th September 2013, 08:17 PM   #6
marce is offline marce  United Kingdom
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The main concern of a lot of audioholics is jitter, with at least a double sided design (and preferably more) you can have a proper return plane and control the impedance of the traces better for the digital signals and so get better signal integrity and thus less jitter etc.
A single sided design is a budget design, for high end I would expect all out on all aspects of the design, including the layout. IMO
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Old 14th September 2013, 06:04 AM   #7
Julf is offline Julf  Europe
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Quote:
Originally Posted by marce View Post
The main concern of a lot of audioholics is jitter, with at least a double sided design (and preferably more) you can have a proper return plane and control the impedance of the traces better for the digital signals and so get better signal integrity and thus less jitter etc.
A single sided design is a budget design, for high end I would expect all out on all aspects of the design, including the layout. IMO
Yes, that is a rational approach I agree with. It's just that I have come across far too many audioholics who throw reason out of the window and favour some esoteric design that violates most sane design principles. Thus there must be people out there that are "layer purists" who feel multi-layer boards don't sound "right"...
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Old 14th September 2013, 08:56 PM   #8
JanErik is offline JanErik  Finland
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Quote:
Originally Posted by smallangryboy View Post
Do you plan on releasing a printed PCB?
Nope, have to DIY...
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Old 22nd January 2014, 06:19 PM   #9
tommy_o is offline tommy_o  United States
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How did this go? I just saw the project page.
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Old 22nd January 2014, 06:42 PM   #10
maxw is offline maxw  United Kingdom
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Quote:
Originally Posted by JanErik View Post
Nope, have to DIY...
Why? Maybe do your own PCBs for testing and development but have you seen how cheap getting PCBs made is these days?

Seeedstudio = Cheap, from China.
OSHPark = Quality, from USA.

Both great services, I've used both and never had a problem.
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