Hummingbird Verita Dual Mono AK 4495S XMOS - diyAudio
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Old 10th July 2015, 11:51 PM   #1
joro_s is offline joro_s  Bulgaria
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Join Date: Sep 2009
Location: Sofia
Default Hummingbird Verita Dual Mono AK 4495S XMOS

Hi,

We’re pleased to present a design we’ve worked on for the last 8 months. The project is realized with cooperation of MisterRogers.

The final design took a little longer than anticipated - resulting in several stages:
  • First stage, the analogue circuit was designed for ‘through hole’ components.
  • Second stage, the analogue circuit was reworked for SMD components.
    • The idea was to compare both designs sonically. Many different listeners at different gatherings verified the SMD design to be as good, or better than the first stage through-hole design. Corrections or tweaks were identified during testing to insure the best possible sonic performance.
  • Third stage, apply these changes to our SMD board.

We’ve also designed a control LCD indicator board, along with the firmware needed to provide complete control of all DAC chip features.

Specifications
  • USB (XMOS based) input: up to 384kHz 32 bit, up to DSD128
  • AES/EBU up to 192kHz, 24 bit
  • S/PDIF up to 192kHz, 24 bit
  • Optical up to 192kHz, 24 bit
  • Outputs: RCA (Single Ended) & XLR (Balanced)

All available features of the DAC are accessible via indicator board / firmware
  • 5 different sonic filters
  • DSD mode - volume bypass and normal path
  • 5 different sound quality settings
  • Volume control
  • Phase inverting
  • De-emphasis

Realization
  • Two AK4495S DAC chips are used in a Dual Mono configuration
  • Discrete power supplies - one per channel
  • Pre-regulator / LDO for digital circuit
  • ADM7150 LDO is used for oscillators
  • NDK NZ2520SD oscillators, optionally Crystek CCHD 957’s can be used
  • All inputs are Galvanically Isolated
  • In the analogue circuit we’ve only used PPS Film capacitors, no ceramic ones. All signal path resistors are Susumu.
  • To power this board one will need three transformers: 2x22V and 1x12V.


Price for USB input board, DAC board and LCD indicator board: Euro 546.
  • For EU additional 20% VAT.
  • Estimation for ready boards: late August 2015.
  • All signup’s on or before 7/31/15 receive free shipping.

Regards,
Joro
Attached Images
File Type: jpg Hummingbird_stage_1_TH.jpg (598.6 KB, 1261 views)
File Type: jpg Hummingbird_stage_2_smd.jpg (714.1 KB, 1233 views)

Last edited by joro_s; 10th July 2015 at 11:57 PM.
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Old 11th July 2015, 03:06 AM   #2
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pinnocchio's Avatar
 
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Location: Montreal
Very nice!!!

Just a quick question... Will you be supporting a remote control such as the Apple remote?

If I may also add, wouldn't it be easier for DIY to use a rotary encoder with push button instead of the four buttons? It is easier to implement on a faceplate than those four buttons.

Thanks
Do
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DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3

Last edited by pinnocchio; 11th July 2015 at 03:13 AM.
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Old 11th July 2015, 10:54 AM   #3
Chanh is offline Chanh  Australia
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Join Date: Oct 2013
Location: Perth Western Australia
Hi Joro and Lyuben,

First of all, Congratulations on this project! The team has gone along way. Well done!

Please note - I have made an order for the complete combo AK4490 with LME49710 and LCD Yetersday, unaware this will be available. Would you kindly allow me to exchange the order made Yetersday for AK4490 combo to this dual mono AK4495S with Crytek CCHD-957's? Please invoice me the differences to my PayPal account.

I will also email Lyuben to get this assistance.
Many thanks,
Chanh

Last edited by Chanh; 11th July 2015 at 11:23 AM.
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Old 11th July 2015, 11:57 AM   #4
Myint67 is offline Myint67  Singapore
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Join Date: Dec 2013
Location: Singapore
Nice project .
How about i2s ?

Best
Myint
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Old 11th July 2015, 12:12 PM   #5
Chanh is offline Chanh  Australia
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Join Date: Oct 2013
Location: Perth Western Australia
Quote:
Originally Posted by Myint67 View Post
Nice project .

How about i2s ?



Best

Myint

You meant having I2S direct from BeagleBone Black via Botic driver in the absence of I2S over USB add-on XMOS board? If so, I would also be interested!

Chanh.
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Old 11th July 2015, 12:17 PM   #6
Myint67 is offline Myint67  Singapore
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Hi Chanh ,
Yes ,i2s Best way for all user 😊
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Old 11th July 2015, 12:54 PM   #7
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maty tinman's Avatar
 
Join Date: Apr 2012
Location: Tarragona (Spain)
Curious, yesterday I read about the DAC (with Google Translate) in this Bulgarian web:

Нещо интересно на хоризонта

-> MYHIFI - ???? ????????? ?? ?????????

with GT to English: Something interesting on the horizon

-> https://translate.google.es/translat...BD%D1%82%D0%B0
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Old 11th July 2015, 12:55 PM   #8
Chanh is offline Chanh  Australia
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Join Date: Oct 2013
Location: Perth Western Australia
Quote:
Originally Posted by Myint67 View Post
Hi Chanh ,

Yes ,i2s Best way for all user
Agreed! Though it would deviate somewhat from the original design nor will it be feasible?
May be Joro would enlighten us all its feasibility?
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Old 11th July 2015, 11:58 PM   #9
joro_s is offline joro_s  Bulgaria
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Join Date: Sep 2009
Location: Sofia
Hi,

Quote:
Originally Posted by pinnocchio View Post
...
Just a quick question... Will you be supporting a remote control...
I have to write some more code for adaptive receiver.

Quote:
Originally Posted by pinnocchio View Post
... If I may also add, wouldn't it be easier for DIY to use a rotary encoder with push button instead of the four buttons? It is easier to implement on a faceplate than those four buttons....
Yes, that's correct, for me it would be easier with this encoder, but some friends didn't approve this scenario.

Quote:
Originally Posted by Chanh View Post
...
Please note - I have made an order for the complete combo AK4490 with LME49710 and LCD Yetersday, unaware this will be available. Would you kindly allow me to exchange the order made Yetersday for AK4490 combo to this dual mono AK4495S with Crytek CCHD-957's? Please invoice me the differences to my PayPal account....
Thank you. No problem at all.

Quote:
Originally Posted by Myint67 View Post
Nice project .
How about i2s ? ..
The device is already done and I don't think to add I2S input. USB to I2S deals quite good, IMHO.

Regards,
Joro
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Old 12th July 2015, 02:03 PM   #10
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Join Date: Mar 2005
Location: DUS
Hi Joro.

I'm using your current USB-I2S interface. I really like it.

However. With any kind of USB filter (iPurifier, USB-Regen, etc.) attached to it
it improves/changes its performance. ( I use external power supplies and have the 5V
line disconnected)

I'm wondering if you have put some extra focus on the USB interface to make it even better.
Have you tested it against e.g. Uptone Audio USB-Regen, Schiit Wyrd, etc. ??

With the new board @650€, you're entering a different market segment.
The board gotta be better then pretty much all other DIY solutions around.
And then there are also plenty of capable commercial DACs in that ballpark.
You'll face a tough competition.
A properly implemeneted USB interface that wouldn't require an e.g. USB-regen or Schiit Wyrd etc., anymore could make THE difference to me.

THX
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