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Old 1st October 2013, 07:46 PM   #31
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Please write your name in the list below and choose you want to:

1. adeveza DAC module + output stage
2. papapew DAC module + output stage
3. smokingdog DAC module + output stage
4. gde3 DAC module + amanero
...
20 the end .

add or remove options, like output stage, chassie, transformers and Amanero usb module
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Old 4th October 2013, 02:57 AM   #32
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Here the PCB layout of the new output stage (We say : DCS V/Istage ), the main specifications:

- no feedback
- very low distortion because it work as current amplifier
- Vbe nonlinearity compensated using diamond buffer on output stage
- zero dc offset using dc servo loop
- variable voltage gain only changing a single resistor (I/V)
- high output current to drive any low impedance headphone in pure class A
- high output voltage to drive any high impedance headphone
- very low output impedance to drive any cable
- both un-balanced and balanced output
- differential configuration to reduce common mode DAC errors
Attached Images
File Type: jpg DCS-VI.jpg (882.1 KB, 989 views)
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update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 5th October 2013, 04:40 PM   #33
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Default I also want a DAC!

Quote:
Originally Posted by audiodesign View Post
Please write your name in the list below and choose you want to:

1. adeveza DAC module + output stage
2. papapew DAC module + output stage
3. smokingdog DAC module + output stage
4. gde3 DAC module + amanero
5. villanueva DAC module +output stage
...

20 the end .

add or remove options, like output stage, chassie, transformers and Amanero usb module
  Reply With Quote
Old 6th October 2013, 09:20 AM   #34
diyAudio Member
 
Join Date: Sep 2005
Send a message via MSN to audiodesign Send a message via Skype™ to audiodesign
Please write your name in the list below and choose you want to:

1. adeveza DAC module + output stage
2. papapew DAC module + output stage
3. smokingdog DAC module + output stage
4. gde3 DAC module + amanero
5. villanueva DAC module +output stage
...

20 the end .

add or remove options, like output stage, chassie, transformers and Amanero usb module, see relative cost on post #2
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Old 6th October 2013, 12:53 PM   #35
MattMax is offline MattMax  Netherlands
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Join Date: Jan 2008
Quote:
Originally Posted by quanghao View Post
Here the PCB layout of the new output stage (We say : DCS V/Istage ), the main specifications:

- no feedback
- very low distortion because it work as current amplifier
- Vbe nonlinearity compensated using diamond buffer on output stage
- zero dc offset using dc servo loop
- variable voltage gain only changing a single resistor (I/V)
- high output current to drive any low impedance headphone in pure class A
- high output voltage to drive any high impedance headphone
- very low output impedance to drive any cable
- both un-balanced and balanced output
- differential configuration to reduce common mode DAC errors
Hi Quanhao and Andrea,

What would be needed to use new discrete feedback stage in the "old" version of the DAC? Can I just replace the op-amps?
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Old 6th October 2013, 12:57 PM   #36
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Location: Vietnam
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Quote:
Originally Posted by MattMax View Post
Hi Quanhao and Andrea,

What would be needed to use new discrete feedback stage in the "old" version of the DAC? Can I just replace the op-amps?
Hi!

you only change the PCB opam, and use DAC in Vout put!
thanks
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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 6th October 2013, 01:44 PM   #37
MattMax is offline MattMax  Netherlands
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Join Date: Jan 2008
Quote:
Originally Posted by quanghao View Post
Hi!

you only change the PCB opam, and use DAC in Vout put!
thanks
Great. What would be the price for the assembled output stage to use in my DAC? Is it USD 150? When will this be ready to ship?
Thanks.
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Old 6th October 2013, 01:59 PM   #38
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Join Date: Sep 2009
Location: Vietnam
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Quote:
Originally Posted by MattMax View Post
Great. What would be the price for the assembled output stage to use in my DAC? Is it USD 150? When will this be ready to ship?
Thanks.
yes 150$, but now i produce it!
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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 6th October 2013, 03:06 PM   #39
papapew is offline papapew  United States
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Join Date: Aug 2012
1. adeveza DAC module + output stage
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
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Old 6th October 2013, 05:45 PM   #40
MattMax is offline MattMax  Netherlands
diyAudio Member
 
Join Date: Jan 2008
1. adeveza: DAC module + output stage
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
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