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AK4458 multichannel DAC with I2S input
AK4458 multichannel DAC with I2S input
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Old 19th November 2017, 08:13 PM   #101
zarandok is offline zarandok  Austria
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Join Date: Feb 2015
I am a little uncertain in respect of optimal grounding (copper pour for signal and power supply bypassing caps). Are there some experts who can give some tips?

(layout in DipTrace free format)
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File Type: zip mydac OPA 5.0.zip (205.0 KB, 6 views)
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Old 22nd November 2017, 10:54 AM   #102
zarandok is offline zarandok  Austria
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So, I have made as I find it right...

The big bypass capacitors (10-100uF) have separate traces to the GND connection point. The small caps (10-100nF) near the OPAs are connected to the copper pour on both side. I didn't find a separate way for them. Some top-bottom GND vias must be still placed perhaps.

The lower side (for Ch1-4) must be simply mirrored...

At the first I do not plan to use the on-board regulators (I have external ones), will simply short them.
Attached Images
File Type: jpg pcb_top_1.JPG (158.2 KB, 174 views)
File Type: jpg pcb_bottom_1.JPG (123.9 KB, 170 views)

Last edited by zarandok; 22nd November 2017 at 10:59 AM.
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Old 29th December 2017, 10:13 AM   #103
FBteA is offline FBteA
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Quote:
Originally Posted by zarandok View Post
Slowly but surely...
The filter pcb with only 4 channel and without copper pour yet (soon will be finished)...
I`ll order 10 pcs. from each pcb. Will somebody get from that?
Hi,

I am interested in buying the boards because I am looking for a 8 ch DAC.
Do you have an estimated price for the boards and your complete DAC project?
And what about software drivers? Will it show up in Windows 10 and is it ASIO compliant?

Succes and "Every step you make every breath you take...."
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Old 5th January 2018, 03:16 PM   #104
zarandok is offline zarandok  Austria
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Join Date: Feb 2015
The DAC boards doesn't cost too much, about 2$ for each empty board. The AK4458 costs <10$. The expensiver parts are the housing (30-200$), transformers (30-80$), connectors, ect... and a good asynchronous USB to I2S receiver (100$). I did not made a calculation yet, but an estimation for my complete project (without assembly time of course) makes about 350$. This sum includes my available 8ch MiniDSP USBStreamer too, it works fine with Win10 ASIO...

I have made some changes, pictures will follow...

Last edited by zarandok; 5th January 2018 at 03:23 PM.
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Old 6th January 2018, 10:35 AM   #105
FBteA is offline FBteA
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Join Date: Jun 2016
Quote:
Originally Posted by zarandok View Post
The DAC boards doesn't cost too much, about 2$ for each empty board. The AK4458 costs <10$. The expensiver parts are the housing (30-200$), transformers (30-80$), connectors, ect... and a good asynchronous USB to I2S receiver (100$). I did not made a calculation yet, but an estimation for my complete project (without assembly time of course) makes about 350$. This sum includes my available 8ch MiniDSP USBStreamer too, it works fine with Win10 ASIO...

I have made some changes, pictures will follow...
OK I understand how you will "deliver" the software and drivers, smart.
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Old 6th January 2018, 10:50 AM   #106
zarandok is offline zarandok  Austria
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Join Date: Feb 2015
Quote:
Originally Posted by FBteA View Post
OK I understand how you will "deliver" the software and drivers, smart.
I do not want deliver anything, I'm not a manufacturer! If somebody wishes can give some tips, files or bare PCBs for manufacturing costs, nothing more...
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Old 6th January 2018, 10:53 AM   #107
zarandok is offline zarandok  Austria
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Some material collecting for housing, PSU, ect...
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Old 6th January 2018, 10:59 AM   #108
zarandok is offline zarandok  Austria
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I've completly redesigned the DAC and filter boards. I've left the stacked arrangement and made a new side-by-side concept with revised signal and power supply line paths...
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File Type: jpg DAC-5_top_1.JPG (74.5 KB, 73 views)
File Type: jpg OPA-5_top_1.JPG (65.1 KB, 74 views)
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Old 8th January 2018, 09:18 AM   #109
zarandok is offline zarandok  Austria
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Join Date: Feb 2015
I've made some minor changes in the last days and share my design files (DipTrace). If somebody is feeling himself invited to review them, would be happy...
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File Type: zip myDAC 5.0 AK4458 8ch.zip (247.3 KB, 3 views)
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