Bragi, an Asynchronous ES9023 DAC with isolated I2S Input and Alps RK27 Volume pot - Page 2 - diyAudio
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Old 27th September 2012, 05:09 PM   #11
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I made a few minor changes to the board yesterday and sent the Gerbers to the manufacturer.

Now the waiting begins.
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Old 28th September 2012, 07:49 PM   #12
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This is the final schematic and layout that was sent to the manufacturer.

Overall, I must say that I am more than satisfied with how it ended up.

Took good care in ensuring an uninterrupted groundplane, good bypassing, decoupling with resistors and ferrites in appropiate places, input connector with 5 ground pins to ensure proper ground connection between source and DAC.
Attached Images
File Type: png Bragi_Schematic_Final.png (53.1 KB, 687 views)
File Type: png Bragi_Gerber_Final.png (76.5 KB, 574 views)

Last edited by Neutrality; 28th September 2012 at 08:00 PM.
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Old 3rd November 2012, 10:44 PM   #13
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I am almost done assembling the board.

Just need to mount the ES9023 chip, connectors and the volume pot. The volume pot I already have, the ES9023 chip and connectors I will receive on Monday.

It will go together with this : Balder, OPA2134+BUF634 Headphone Amplifier

Once I get a supply board done it should fit nicely into a not too large cabinet.

Last edited by Neutrality; 3rd November 2012 at 10:50 PM.
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Old 5th November 2012, 05:00 PM   #14
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Got it up and running.

Sent a 1kHz sine wave from my PC, through the TE7022 USB to I2S converter and then into the DAC board.

Output from the DAC board? A perfect 1kHz sine wave......



No listening impressions yet since I had no amplifier available at work but I should be getting around to listening to it sometime this week.

Anyway, I am happy that it works.

Pics might be incoming tomorrow.

Last edited by Neutrality; 5th November 2012 at 05:03 PM.
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Old 11th November 2012, 09:53 PM   #15
rade95 is offline rade95  United States
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Hi, are you still taking orders for the PCB?
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Old 11th November 2012, 10:09 PM   #16
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Quote:
Originally Posted by rade95 View Post
Hi, are you still taking orders for the PCB?
Well, I have not taken any orders since I just made this for my own personal use and there has not been any interest so far.

However, I do have a few left if there is any interest.
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Old 12th November 2012, 06:47 PM   #17
rade95 is offline rade95  United States
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Sorry for some reason I thought you were taking orders. I must have mixed the threads. If those you have left are based on the final design, I would like to purchase a pair. I could pay by PayPal. Let me know please. thanks
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Old 13th November 2012, 06:26 PM   #18
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Quote:
Originally Posted by rade95 View Post
Sorry for some reason I thought you were taking orders. I must have mixed the threads. If those you have left are based on the final design, I would like to purchase a pair. I could pay by PayPal. Let me know please. thanks
I hope you can wait a week or so, just until I actually get to do some listening tests.
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Old 15th November 2012, 02:38 PM   #19
rade95 is offline rade95  United States
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Quote:
Originally Posted by Neutrality View Post
I hope you can wait a week or so, just until I actually get to do some listening tests.
of course, no problem at all.
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Old 19th November 2012, 04:59 PM   #20
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Crossposting from another thread. :

Got it(Balder) up and running today together with my ES9023 DAC(Bragi).

First impressions are very positive.

Detailed without being bright and plenty of control and power.

Tomorrow I will try it with a pair of cheap Sennheiser HD415 110dB/32 Ohm headphones as well as my "highendish" 96dB/250 Ohm Beyerdynamic DT 880 Pro headphones.


So basically I sound like everything is working as intended.
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