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Old 25th February 2016, 07:33 AM   #1
tedkok is offline tedkok  Hong Kong
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I am planning to make a USB DAC system using XMOS and NOS discrete R2R DAC that can accommodate up to 24 bit 192 Kbit/s with digitally controlled R2R output volume control. JFET output buffer. Wondering if anyone will also be interested ?
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Old 25th February 2016, 10:22 AM   #2
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Default Board without power supply is good.

Hi Tedkok,

Yes I would be interested.
I am interested in a DAC / remote volume solution that can be implemented in an active monitor system.
USB input is good, but we also require 12s, AES and SPDIF inputs as well.

I have my own very high quality DC power supply available to the board so I would not want to a high end power supply as this would be a waste of money and board space for me. I can supply pristine DC at whatever voltage is required.

Thanks and all the best
" This is not the end, not even the beginning of the end, but it is the end of the beginning "
Sir Winston Churchill 1943
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Old 25th February 2016, 10:26 AM   #3
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I'll certainly be interested in the design of the R2R DAC.
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
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Old 20th June 2016, 03:15 PM   #4
tedkok is offline tedkok  Hong Kong
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Thanks for the message. After some deep thinking, I considered that it will be safer to design the USB DAC using off the shelf DAC first, before moving to discrete component R2R DAC.

I am working on the first design

XMOS (XU208) based USB interface

with DAC of my choice, but will also need you guys' recommendation.
Should I work with a ESS9018Q2M, or dsd1973?
Both support DSD, and 192KHz 24bit PCM audio.

Any suggestions?
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Old 28th June 2016, 04:47 AM   #5
baek47 is offline baek47  Denmark
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I just connected a X-1 XU208 XMOS USB from I2S (not spdif) to an old philips tda1543 (pulled from a old cd). There is music.

Just struggling to get my raspberry to recognize the USB Card.
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Old 12th October 2016, 12:53 AM   #6
tedkok is offline tedkok  Hong Kong
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After some struggling, a XMOS XU208 + ESS9018 DAC module as the first step.

The module contains all the power management circuit, TCXO, such that it works with a single 5V (USB power), and the following control

1) BT, analog, USB input selectable
2) APPLE/Android input selectable
3) USB and two buttons ESS bit perfect vol. control
4) USB and button Mute control

There is external relay control pin from XMOS to allow selectable output between ESS DAC output and an analog source

The volume and mute control is UAC 2.0 compatible, or through buttons connected to XMOS

The XMOS software is under development, hopefully to update you within this month.

I was wondering if anyone would be interested to purchase this module if it has a price tag of USD40 + shipping?
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