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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 14th October 2013, 04:37 AM   #51
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Quote:
Originally Posted by villanueva View Post
Hi,

I am very interested in your great work.
Is there a multichannel version of the kit?
I at least have tried and tested the DAC with DSD Multichannel signal?
Greetings.

Rafael.
Hi!
only 2 Chanel , the good sound!
thanks
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Old 18th October 2013, 05:33 AM   #52
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Default LCD 4x20

Here the preview of the new controller and firmware working with 4x20 LCD.
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Old 19th October 2013, 12:11 PM   #53
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I will give a few humble opinions on this setup:

1) Should use VFD display instead of LCD for highend DAC. Even a basic 16x2 VFD is still better than the glaring 20x4 LCD. OLED will be even better.

2) Should use the USB-capable PIC18F4550 MCU instead of PIC16F877A. After programmed it with boatloader and firmware, with just a few passive components and a mini USB B-type connector designed to the controller board, user only need a USB cable and PC to re-programme it. User does not need to go through the hassle of purchasing Pick-It programmer.

3) Should indicate maximum supported sampling rate on COAX, AES/EBU and Toslink input and well-tested it.

4) Consider giving the existing DAC-END R users with Opamp IV some discount on the discrete output stage. I personally feel that spending more than $100 on discrete IV + $60 on Opamp IV is a bit steep. And where is the plain discrete IV daughter card that utilise the Opamp IV regulator?

5) Consider using rotary encoded knob (with push function) instead of buttons.

Thanks.

Last edited by rredline; 19th October 2013 at 12:31 PM.
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Old 20th October 2013, 07:33 PM   #54
Sandor is offline Sandor  Italy
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What is the cost of shipping to Italy for a complete DAC (option 6) ?
Do you provide a tracking number of the shipping?
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Old 21st October 2013, 09:07 PM   #55
caad is offline caad  Denmark
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1. adeveza: DAC module + amanero + output stage + transformer (Complete Set: Item 6)
2. papapew: DAC module + amanero + output stage + transformer
3. smokingdog: DAC module + output stage
4. gde3: DAC module + amanero
5. villanueva: DAC module +output stage
6. MattMax: output stage
7. CAAD: output stage
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Old 23rd October 2013, 05:22 PM   #56
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1) Should use VFD display instead of LCD for highend DAC. Even a basic 16x2 VFD is still better than the glaring 20x4 LCD. OLED will be even better.

Yes, we are looking about a 4x20 OLED but these are very expensive

2) Should use the USB-capable PIC18F4550 MCU instead of PIC16F877A. After programmed it with boatloader and firmware, with just a few passive components and a mini USB B-type connector designed to the controller board, user only need a USB cable and PC to re-programme it. User does not need to go through the hassle of purchasing Pick-It programmer.

Some years ago I tried the configuration with the bootloader on 18F4550, I wanted to make an usb oscilloscope, I found it a bit complex but in this context has some advantages.

3) Should indicate maximum supported sampling rate on COAX, AES/EBU and Toslink input and well-tested it.

I have tested until 192KHz

4) Consider giving the existing DAC-END R users with Opamp IV some discount on the discrete output stage. I personally feel that spending more than $100 on discrete IV + $60 on Opamp IV is a bit steep. And where is the plain discrete IV daughter card that utilise the Opamp IV regulator?

Quanghao have very low profit margins so it can not make additional discounts

5) Consider using rotary encoded knob (with push function) instead of buttons.

Yes, this can be considered as an option on firmware.
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Old 24th October 2013, 06:19 PM   #57
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Default Multichannel DSD

Hi Andrea,
I wonder what happens when you try to play multichannel DSD music with your DAC. would it be reproduced in Stereo anyway?
And finally, it is possible to include in the firmware the ability to play for the 8 channels?

Congratulations to both for the good work!

Rafael.
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Old 25th October 2013, 01:45 AM   #58
we417 is offline we417  Norway
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Hi!

Can I use your arduino controller on my TP BuffaloIII DAC?

Br

Last edited by we417; 25th October 2013 at 02:11 AM.
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Old 26th October 2013, 01:49 PM   #59
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Default V2 test now!

And thank all!
Attached Images
File Type: jpg DAC32-3 run.jpg (231.2 KB, 559 views)
File Type: jpg 2.jpg (524.9 KB, 555 views)
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Last edited by quanghao; 26th October 2013 at 01:51 PM.
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Old 28th October 2013, 12:10 PM   #60
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Quote:
Originally Posted by quanghao View Post
And thank all!
Hi set me on the list for ordering new output module. Blackberry
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