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Old 4th November 2012, 01:15 PM   #61
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Here the last modification on shunt power supply.

I have found a little error on the pcb about the negative shunts on CCS.

The 3.3V (VANA) and the 1.2V (CORE) should have 12 ohm 2W on CCS instead of 22ohm to support higher current.

All the shunt are now stable without capacitor compensantion and work very good.

The reference of voltage has been connect on output to reduce the noise to zero and it is impossible measure it.

I am considering to add on output stage a BUF634 to drive an headphone.
Attached Images
File Type: jpg Shunt_corr_ver2b.jpg (167.0 KB, 726 views)
File Type: jpg Shunt_corr_ver2a.jpg (213.1 KB, 715 views)
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Old 6th November 2012, 01:23 PM   #62
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today, i have PCB for test this DAC.
If all ok, i tell you more information!
thanks
Attached Images
File Type: jpg DAC-END R test.jpg (614.6 KB, 672 views)
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Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 8th November 2012, 06:20 AM   #63
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I have ready the first release of firmware to control the ES9018.

The my idea is to implement the following configuration in the image.

The firmware now run on a 16F877 20MHz with 16x2 LCD and I have used the P86B96 chip to convert the I2C level get a bidirectional 5V to 3.3V.

For the final design I will use a 16LF877 10MHz and 3.3V 20x2 LCD.
Attached Images
File Type: gif InputSel.gif (18.3 KB, 604 views)

Last edited by audiodesign; 8th November 2012 at 06:28 AM.
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Old 8th November 2012, 11:15 AM   #64
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Default I have finished Test all PCB DAC-END R!

Today, I have finished DAC-END R, My work nearing completion.The test PCB is finished. I am very glad

Here are the pictures.
Please see.
Attached Images
File Type: jpg 1.jpg (267.8 KB, 566 views)
File Type: jpg 2.jpg (364.1 KB, 209 views)
File Type: jpg 3.jpg (336.6 KB, 214 views)
File Type: jpg 4.jpg (318.5 KB, 138 views)
File Type: jpg 5.jpg (255.5 KB, 118 views)
File Type: jpg 6.jpg (326.8 KB, 114 views)
File Type: jpg 7.jpg (286.3 KB, 111 views)
File Type: jpg 8.jpg (255.0 KB, 141 views)
File Type: jpg 9.jpg (286.7 KB, 204 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 9th November 2012, 02:31 AM   #65
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Hi all!

QuangHao really excited and happy with the sound quality, particularly measured parameters of the DAC-END R:

1. I used the tester Tektronix AM700
Signal to blance
Output balnce

2. Measurement parameters:
Frequency range of 0 - 80KHz, at 0 dB, very flat from 0 to 35kHz.
Frequency range from 0-10kHz, 0 dB, very flat

Harmonic distortion almost did not see the.

3. Conclusion:
With this measure, the sound of the DAC-END R will be very honest, this proper design criteria of Andre and me. I am very pleased and surprised at the actual measurement results, as well as listen to.

Invite you to view images
thanks a lot!
Quanghao
Attached Images
File Type: jpg measurement-system-1.jpg (859.9 KB, 223 views)
File Type: jpg frequency-0-10kHz.jpg (767.3 KB, 268 views)
File Type: jpg measurement-system-2.jpg (199.0 KB, 172 views)
File Type: jpg frequency-0-80kHz.jpg (772.3 KB, 219 views)
File Type: jpg frequency-0-80kHz-at--40dB.jpg (798.3 KB, 121 views)
File Type: jpg harmonic-distortion.jpg (741.9 KB, 219 views)
File Type: jpg in blace-out blace.jpg (174.8 KB, 148 views)
__________________
Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 9th November 2012, 09:22 PM   #66
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Here the first firmware to control the ES9018 with a 16F877 microcontroller.

1) Input selector I2S, Spdif1, 2 and 3 as image
2) Volume control
3) Mute function
4) Optional XMOS module check
5) All function set by remote control

For the test I have used the my AD1955 controller
http://www.audiodesignguide.com/HiRe.../usbdac2a.html
+ P86B96 chip to convert the I2C level get a bidirectional 5V to 3.3V.
Attached Images
File Type: gif InputSel.gif (18.3 KB, 111 views)
Attached Files
File Type: zip DAC32.zip (8.7 KB, 35 views)

Last edited by audiodesign; 9th November 2012 at 09:24 PM.
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Old 10th November 2012, 08:38 AM   #67
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Here the new firmware and some photos of my test environment.

At this time I am using the XMOS module by Lucian but I will try soon also the Amanero module (Amanero Technologies).

Using XMOS module the actual firmware can display USB status and sampler frequency.
Attached Images
File Type: jpg 20121110_101516.jpg (166.8 KB, 174 views)
File Type: jpg 20121110_101501.jpg (213.2 KB, 188 views)
Attached Files
File Type: zip DAC32_ver5a.zip (9.1 KB, 47 views)
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Old 11th November 2012, 12:37 PM   #68
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the ground plane looking back towards the dac should not be blocked. avoid routing on the ground plane near the dac outouts!
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Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 12th November 2012, 01:13 AM   #69
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Hi Quanghao,

Is your AD1865 kit at $247 still available?
I sent an email to your web shop but have not received any reply.
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Old 12th November 2012, 06:16 AM   #70
qusp is offline qusp  Australia
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Quote:
Originally Posted by quanghao View Post
the ground plane looking back towards the dac should not be blocked. avoid routing on the ground plane near the dac outouts!
yes thats correct, they made this recommendation way back with the 9008 and you have numerous blockages, it doesnt look like you have a solid ground plane to block...?
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