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Old 5th December 2009, 09:39 AM   #91
GTHICM is offline GTHICM  United States
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Default Great Collaboration

This is a very welcome project. The boards look very well done, the price now is really very reasonable and of course the design is great, too. I am using a TDA1541A Aya dac that is very nice, but would like to try this approach and compare. A kit would be very helpful, as it takes considerable time and effort to collect all the parts, especially living in some far flung places, like Vietnam.

Is there any thought to producing the boards for the tube output? I was considering making a small batch of the boards for personal use. This would be a nice addition to the offering and save me the trouble, too!
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Old 5th December 2009, 11:44 AM   #92
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CS8414 receiver chip should have separate power supply for digital part and separate power supply for analog part.
74HC04 should have separate supply also.
DAC chip AD1865 should have 3 separate power supplies. One for +5V digital, one for +5V analog and one for -5V analog.
All together 6 power supplies. And I see only 3. To share same supply for receiver and DAC chip is not the best thing you can do.

At output of Simplistic Salas shunt reg you have 2 capacitors, 470uF and 0.1uF. Before TL431 you have 220uF and 10nF, after TL431 you have again 220uF and 10nF. At chip supply pins you have another 47uF and 0.1uF. Together 8 capacitors for each supply pin?

Why shunting shunt regulator with a lot of caps and TL431? More caps = better sound?
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Old 5th December 2009, 02:03 PM   #93
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Ok, but normally the grid of the output tube,like in your DacEnd, have a dc voltage of more than 1V.
Have you made any test of the limit voltage?
Ciao
Guglielmo
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Old 5th December 2009, 04:35 PM   #94
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Quote:
Originally Posted by stormsonic View Post
CS8414 receiver chip should have separate power supply for digital part and separate power supply for analog part.
74HC04 should have separate supply also.
DAC chip AD1865 should have 3 separate power supplies. One for +5V digital, one for +5V analog and one for -5V analog.
All together 6 power supplies. And I see only 3. To share same supply for receiver and DAC chip is not the best thing you can do.

1. You know, all the sound equipment are important to a separate power source. I used to separate Tl 431 to each power before in different locations.

2. If you use only Boad DAC-ENd , you can use suplly simple +5 V and - 5v single is is ok, but not needed to Bo Salas..

At output of Simplistic Salas shunt reg you have 2 capacitors, 470uF and 0.1uF. Before TL431 you have 220uF and 10nF, after TL431 you have again 220uF and 10nF. At chip supply pins you have another 47uF and 0.1uF. Together 8 capacitors for each supply pin?

Why shunting shunt regulator with a lot of caps and TL431? More caps = better sound?
I show many capacitor parallel , the sound is better

Im sorry, my english is not good! very bad!
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Old 8th December 2009, 03:29 AM   #95
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some information about DAC-END

VNAV • View topic - DAC END - Andrea Ciuffoli layout QuangHao

:: 818 ::

Thank
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File Type: jpg DAC End (Small).JPG (76.7 KB, 1107 views)
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Old 8th December 2009, 03:36 AM   #96
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and more
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Old 8th December 2009, 04:16 AM   #97
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Default Dac-End

Many of my friends have used DAC-END, They dont using the I/V stage as the sample Andrea Ciuffoli, they only use Pre out put.( Dac-End +Pre Tube)

They said with me: *the sound of DAC-end is great, extremely honest,and wonderful!*
And I say: Thank you Andrea Ciuffoli and: Salas!
__________________
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 December 2009, 01:39 AM   #98
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And board I/v stage, Use SRPP, you can use tub 6h6, 12ax, 6dj8, 6h30...
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File Type: jpg Board-IV.jpg (133.1 KB, 990 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 9th December 2009, 03:23 AM   #99
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And cricuit supply for I/V stage
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File Type: jpg 10M45-NOBGhv.jpg (66.8 KB, 982 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 9th December 2009, 04:19 AM   #100
vancao is offline vancao  Viet Nam
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Quote:
Originally Posted by audiodesign View Post
The AD1865 chip like many others dual power supply DAC have no dc output.

The AD1853, AD1955, CS4397, CS4398, PCM1798, PCM1794, WM8740 have 2.5v dc on both dac outputs.

The TDA1541 is a dual power supply DAC but it have a little dc output, few mVolt.

----

I am starting a collaboration with quanghao to produce some DAC pcb boards and kit

http://www.diyaudio.com/forums/group...roup-buys.html
This is a good idea, Andrea. PCB printing and parts assembly could be made in Vietnam by Quang Hao Group. Parts from Digi-Key, labor is cheap and skillful, final test is run on Oscilo. I'm quite happy with this DAC.
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