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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 4th February 2010, 09:36 PM   #481
leŽflu is offline leŽflu  Germany
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Join Date: Mar 2004
Location: Hoexter
Hi Quang Hao,
you wrote that youŽd use 6c45 as Valve.
But this is a mono-triode-Valve and the e182cc
has got double triodes.....what did you change in
circuit?
Also Andrea wrote that D3A could be used...well
this is a pentode.....how to implement this one?

Greetings Ulf
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Old 4th February 2010, 09:38 PM   #482
feket663 is offline feket663  Hungary
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Join Date: May 2007
Quote:
Originally Posted by tassosk View Post
From where did you buy, in order to avoid him?
I bought from tube_buyer but did not recieve them yet to tell.
diyaudiokit... from ebay
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Old 4th February 2010, 10:55 PM   #483
rtd is offline rtd  France
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Join Date: Apr 2006
Location: RP
OLD THREAD DAC End by Andrea Ciuffoli
Quote:
Originally Posted by rtd View Post
Got board today, thanks for this quick GB.
One observation on DAC PCB: There is no GND groundplane
Maybe it is not needed with DAC such AD1865
Anyway it matches Andrea Ciuffoli DAC prototype
To go on.
May i haved looked at A. Ciuffoli schematic before !!!
I don't understand few things :

- Why CS8414 pin 24 (M1) is connected to CS8414/AGND and not DGND
- Why using specific regulator (TL431) for CS8414 pin 18 which is M2
as M0 to M4 is to select CS8414 mode.
- Usually LC schematic is used for digital PS for proper decoupling, here there is no L used, is there any specific reason ?

Is there any specific tweak behind schematic used ?
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Old 4th February 2010, 11:10 PM   #484
quanghao is offline quanghao  Viet Nam
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Welcome you. I can not understand why PCB Left to fast so. The assembly components are simple!
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Old 4th February 2010, 11:18 PM   #485
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by leŽflu View Post
Hi Quang Hao,
you wrote that youŽd use 6c45 as Valve.
But this is a mono-triode-Valve and the e182cc
has got double triodes.....what did you change in
circuit?
Also Andrea wrote that D3A could be used...well
this is a pentode.....how to implement this one?

Greetings Ulf
No! i dont change Cricuit of Andrea, I can by E182cc, D3a! I have 2 6c45, I used them!
You can see!
Attached Images
File Type: jpg DAC-out-6c45.jpg (403.9 KB, 311 views)
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Old 4th February 2010, 11:19 PM   #486
apelizzo is offline apelizzo  Australia
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Quote:
Originally Posted by feket663 View Post
Where can I buy a real, working CS8414? I bought 4 pieces from chinese seller, 1 was ok, 3 don't work. Please recommend me a reliable seller, who ships worldwide!
Last year I bought 2 from ferdsaudio on ebay and both were faulty. I asked the replacement and again were faulty. Incredible.

I then bought one here:
CS8414 CS8414CS to DIP28 (PCB adapter- SOIC28) - eBay Other, Electronic Components, Electrical Test Equipment, Business Industrial. (end time 12-Feb-10 04:54:58 AEDST)

and it works!!

Remember to always ground your soldering iron when soldering these kind of chips.
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Old 4th February 2010, 11:24 PM   #487
quanghao is offline quanghao  Viet Nam
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Location: Vietnam
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Quote:
Originally Posted by rtd View Post
Got board today, thanks for this quick GB.
One observation on DAC PCB: There is no GND groundplane
Maybe it is not needed with DAC such AD1865
Anyway it matches Andrea Ciuffoli DAC prototype
Hi! can you show me plesa???
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Old 4th February 2010, 11:27 PM   #488
quanghao is offline quanghao  Viet Nam
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Join Date: Sep 2009
Location: Vietnam
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Quote:
Originally Posted by rtd View Post
To go on.
May i haved looked at A. Ciuffoli schematic before !!!
I don't understand few things :

- Why CS8414 pin 24 (M1) is connected to CS8414/AGND and not DGND
- Why using specific regulator (TL431) for CS8414 pin 18 which is M2
as M0 to M4 is to select CS8414 mode.
- Usually LC schematic is used for digital PS for proper decoupling, here there is no L used, is there any specific reason ?

Is there any specific tweak behind schematic used ?
Sorry! I do not answer this question! thank you!
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Old 4th February 2010, 11:57 PM   #489
rtd is offline rtd  France
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Join Date: Apr 2006
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OLD THREAD DAC End by Andrea Ciuffoli
Quote:
Originally Posted by quanghao View Post
Hi! can you show me plesa???
There is 3 small area behind the CS8414, the AD1865 and the 74Hcxx but not "wide enough" to form a large groundplane.

May be one complete layer could have been used to form the ground plane but may be difficult to route. But I haven't tried so i don't know if possible
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Old 5th February 2010, 12:22 AM   #490
rtd is offline rtd  France
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Join Date: Apr 2006
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OLD THREAD DAC End by Andrea Ciuffoli
Ok we can use LC configuration using 120uH inductance in place of 10R.
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