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Old 6th August 2018, 01:34 PM   #701
BrianDonegan is offline BrianDonegan  United States
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Introducing the Buffalo III-SE-Pro 9028/9038
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Originally Posted by stefanhgm View Post
1. Related to the connection between Cronus and the Buffalo board. There are 2x12 connection pins, but I only got two 2x10 female connector. I will just cut one apart to build my own additional 2x2. Its correct to connect all 2x12 pins, right?
The 2x10 header is designed to mate directly to the 2x10 header on the older 8-Channel Buffalo. You do not need to use it at all for the Buffalo-III Pro.

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2. Are the two 3,3V regulators identical? So, the connectors DCVV and VDD_XO are interchangable?
They are identical.

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3. Is there anything else except the male header to connect to the regulators? There are additional contacts and I saw soem pictures with LEDs.
No, just the 3-pin header. The LEDs were on older versions of the Tridents.

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4. Are the connectors LOCK and A_MUTE on the Buffalo board intended for the two LEDs? Can I use them to show that the Buffalo is powered on at the case? Or which one am I supposed to use for that purpose?
They are for the LEDs. Neither one will indicate power specifically, but one or the other will be on in regular use. For power indication, I would tap power from your power switch or a power supply rail.

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5. Is it a common choice to use the volume poti at the Buffalo? I think controlling the volume via software and at my amp will suffice or am I missing something?
The digital volume control of the ES90x8 DAC will give you the best performance. You can certainly control volume in other ways, depending on your system. If you do not use the volume control, be sure to use the included shunt jumper on the three pin header, which effectively sets the DAC to full-scale output.
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Old 6th August 2018, 01:38 PM   #702
BrianDonegan is offline BrianDonegan  United States
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Introducing the Buffalo III-SE-Pro 9028/9038
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Originally Posted by stefanhgm View Post
The line on the cardboard marks the front border of the case. The piece of newspaper is the missing Placid HD BP Power Supply. And there still needs to get an SSD in there for storing my music. I want to put it below the beagle board. What do you think about these two setups? Is it a problem to stack the transformers?
You will probably want to spin the DAC around to keep I2S signals as short as possible.

Keep in mind that the magnetic poles from toroidal transformers radiate with the axis of the hole, so "aiming" them at your circuit boards (second picture) will result in more risk of noise (still very low risk). There is no issue stacking them, per se, but it may result in more heat (again, low risk).
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Old 8th August 2018, 06:15 AM   #703
itsikhefez is offline itsikhefez  United States
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Introducing the Buffalo III-SE-Pro 9028/9038
I want to add Sample rate to the firmware on the `WithDisplay` branch.
It looks like its a matter of reading R66-69 and deriving it from there?

Besides that, what is the recommended workflow for developing firmware for the Buffalo?
I cloned the repo and loaded it into AtmelStudio and it builds fine.
Is there a way to simulate the Buffalo board in order to debug and step through the code?
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Old 13th August 2018, 08:33 AM   #704
Goto is offline Goto  United Kingdom
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Well, I finally got the Amanero/Hermes/Cronus working (thanks Brian) and have it interfaced to the Buffalo-iii-SE-Pro/Mercury. Operation is sync using the 128fs firmware.

So I can give my full, considered review of this dac now, taking direct feed from the SE outputs into my Focal Utopia headphones which are pleasingly easy to drive.

It's stunning. Thanks TPA.
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Old 13th August 2018, 05:09 PM   #705
Russ White is offline Russ White  United States
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Quote:
Originally Posted by itsikhefez View Post
I want to add Sample rate to the firmware on the `WithDisplay` branch.
It looks like its a matter of reading R66-69 and deriving it from there?

Besides that, what is the recommended workflow for developing firmware for the Buffalo?
I cloned the repo and loaded it into AtmelStudio and it builds fine.
Is there a way to simulate the Buffalo board in order to debug and step through the code?
It's kinda tricky in PureSunc mode - because you don't have a single master clock. You would need to pass that info to the controller (what clock base is being used).

I develop firmware mostly on my mac and use homebrew to install "osx-cross/avr/avr-binutils" and " osx-cross/avr/avr-gcc"

I tend to use Eclipse IDE with CDT and AVR support.

I am not aware of a way to simulate an ES9028/38 - but hey that would be cool. I use an i2C analyzer or display etc and echo back info debugging.

Cheers!
Russ
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Old 13th August 2018, 05:10 PM   #706
Russ White is offline Russ White  United States
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Quote:
Originally Posted by Goto View Post
Well, I finally got the Amanero/Hermes/Cronus working (thanks Brian) and have it interfaced to the Buffalo-iii-SE-Pro/Mercury. Operation is sync using the 128fs firmware.

So I can give my full, considered review of this dac now, taking direct feed from the SE outputs into my Focal Utopia headphones which are pleasingly easy to drive.

It's stunning. Thanks TPA.
Thank you! So glad to hear that! Enjoy!

Cheers!
Russ
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Old 15th August 2018, 04:56 AM   #707
sbobba is offline sbobba  Italy
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Default digital volume control of the ES90x8 DAC

Hi Brian, I would like to replace with a better quality digital volume control potentiometer that I found in your kit. Your is linear from 4,7Kohm and in my surplus I have an excellent linear 10Kohm. I think it may be fine anyway, but I prefer your opinion. Thank
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Old 15th August 2018, 03:26 PM   #708
BrianDonegan is offline BrianDonegan  United States
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Introducing the Buffalo III-SE-Pro 9028/9038
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Originally Posted by sbobba View Post
Hi Brian, I would like to replace with a better quality digital volume control potentiometer that I found in your kit. Your is linear from 4,7Kohm and in my surplus I have an excellent linear 10Kohm. I think it may be fine anyway, but I prefer your opinion. Thank
That should be fine. It is simply acting as a voltage divider. I would not go beyond 10K though.
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Old 15th August 2018, 03:27 PM   #709
Russ White is offline Russ White  United States
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That pot is not in the signal path at all - it forms a voltage divider that used only seen by the controller ADC. The volume control itself is purely digital in the DAC itself based on a register. Changing the pot will have absolutely no effect on the audio signal.

Still you can use any pot you like 2K to 10K should be OK. Just please don't expect any audible changes - because no audio signal is presented to the pot - ever.

Cheers!
Russ
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Old 20th August 2018, 08:46 AM   #710
itsikhefez is offline itsikhefez  United States
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Introducing the Buffalo III-SE-Pro 9028/9038
Do the LED's have to be soldered in order for the Buffalo to work properly, or can they be omitted?
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