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Old 19th March 2011, 10:11 PM   #3731
legarem is offline legarem  Canada
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As I'm still waiting for my Audio GD NFB8W I still use with the chinese dac.
I have 3 of these boards, yesterday I replaced the stock CS4398 little board with the one with caps as suggested by Prairimystic. I still say WOW !!!

Also, great job with your schematic diagram. Thanks
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Old 19th March 2011, 11:02 PM   #3732
Ryssen is offline Ryssen  Sweden
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Quote:
Also, great job with your schematic diagram. Thanks
+1
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Old 20th March 2011, 12:55 AM   #3733
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Default Any recommendation for a good DAC?

Since you guys are talking about DAC I think I can ask this question in this thread.

I am a complete newbie for digital music DIY, who never worked with SMD devices. I am building a new MyRef amplifier for music listening and am planning to build a new better quality DAC as well. I am completely uneducated about various options and technologieds available. I came up with the following choices after doing some web-search and reading forums including this thread:

New 24/192 DAC DA CONVERTER DIR9001+CS8421+PCM1798 USB - eBay (item 160557441643 end time Apr-09-11 09:32:21 PDT)
Hi-End AD1955-DIR9001 Optical Coaxial USB DAC Board - eBay (item 260700445347 end time Mar-29-11 07:26:45 PDT)
DAC DIR9001+TDA1541A 2.0B parallel output OS/NOS [383] - US$219.00 : Hifi Diy--Amplifier,dac kits,hifi audio products and parts online shop, shipping to worldwide

Which one should be a good quality DAC? I would like to feed the board from a CD/DVD player as well as from a DVD-A player. If you have any other suggestion please let me know that as well.

TIA
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Old 20th March 2011, 01:51 PM   #3734
piero7 is offline piero7  Italy
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Quote:
Originally Posted by prairiemystic View Post
I finally got this DAC board sounding good. Before, I couldn't listen to it for more than 10 minutes before reaching for the power switch, which had me wondering what was up.

Spent a day with the scope on 1mV/div using optical and OPA627's.

Adding SMT caps as close as possible to the IC's makes audible improvements:
0.1uF's on (DIP) pins 6,7 VD and 21,22 VA power for the DAC IC.

The CS4398 smurf board has a skinny trace between (DIP) pin 15/17/22. Found a lot of noise (50mVpp) on pin CS4398 pin 17 trace impedance is the problem. Had to go up to 100uF X5R before the noise was reasonable. HUGE improvement in sound, gone is the midrange harshness and detail is back with some velvet.

Added 2.2uF X5R on CS4398 pin 15 (FILT+) like above, across ground fill to the IC pin.

On the motherboard, I shorted the 4 electrolytics on the CS4398 outputs, 2 on the output RCA's and have only +/-3.3mV of DC offset at the RCA's with OPA627's.

The Vregs for +/-12V are the noisiest and 10uF tantalum caps from ADJ divider to GND reduce this.

Added 0.47uF X5R and 10uF tantalum decoupling for the op-amp's rails.

It's musical now, certainly worth the hassle of soldering SMT parts on a cheapo PCB.
can you draw a simple schematic about these modifies please?
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Old 20th March 2011, 02:24 PM   #3735
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Quote:
Originally Posted by hanair View Post
Since you guys are talking about DAC I think I can ask this question in this thread.

I am a complete newbie for digital music DIY, who never worked with SMD devices. I am building a new MyRef amplifier for music listening and am planning to build a new better quality DAC as well. I am completely uneducated about various options and technologieds available. I came up with the following choices after doing some web-search and reading forums including this thread:

New 24/192 DAC DA CONVERTER DIR9001+CS8421+PCM1798 USB - eBay (item 160557441643 end time Apr-09-11 09:32:21 PDT)
Hi-End AD1955-DIR9001 Optical Coaxial USB DAC Board - eBay (item 260700445347 end time Mar-29-11 07:26:45 PDT)
DAC DIR9001+TDA1541A 2.0B parallel output OS/NOS [383] - US$219.00 : Hifi Diy--Amplifier,dac kits,hifi audio products and parts online shop, shipping to worldwide

Which one should be a good quality DAC? I would like to feed the board from a CD/DVD player as well as from a DVD-A player. If you have any other suggestion please let me know that as well.

TIA
Did you not read the name of the thread? There are plenty of threads about other Dacs.
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Old 21st March 2011, 12:19 PM   #3736
kec is offline kec  United States
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Quote:
Originally Posted by piero7 View Post
can you draw a simple schematic about these modifies please?
Maybe prairiemystic can add the mods to his excellent schematic?
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Old 21st March 2011, 08:25 PM   #3737
Ryssen is offline Ryssen  Sweden
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Quote:
Originally Posted by hanair View Post
Since you guys are talking about DAC I think I can ask this question in this thread.

I am a complete newbie for digital music DIY, who never worked with SMD devices. I am building a new MyRef amplifier for music listening and am planning to build a new better quality DAC as well. I am completely uneducated about various options and technologieds available. I came up with the following choices after doing some web-search and reading forums including this thread:

New 24/192 DAC DA CONVERTER DIR9001+CS8421+PCM1798 USB - eBay (item 160557441643 end time Apr-09-11 09:32:21 PDT)
Hi-End AD1955-DIR9001 Optical Coaxial USB DAC Board - eBay (item 260700445347 end time Mar-29-11 07:26:45 PDT)
DAC DIR9001+TDA1541A 2.0B parallel output OS/NOS [383] - US$219.00 : Hifi Diy--Amplifier,dac kits,hifi audio products and parts online shop, shipping to worldwide

Which one should be a good quality DAC? I would like to feed the board from a CD/DVD player as well as from a DVD-A player. If you have any other suggestion please let me know that as well.

TIA
Why don´t you go for the CS4398 that this thread is originaly for?
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Old 22nd March 2011, 01:55 AM   #3738
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Default DAC's output (reconstruction) filter

Has anyone questioned this DAC's output (reconstruction) filter?
It's quite different from Cirrus CS4398 datasheets and the values look weird for a 2-pole differential filter One leg is 45kHz and the other looks like 7.34kHz, which means a 1nF cap should be an 82pF cap...?
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Old 22nd March 2011, 07:57 AM   #3739
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Quote:
Originally Posted by prairiemystic View Post
Has anyone questioned this DAC's output (reconstruction) filter?
It's quite different from Cirrus CS4398 datasheets and the values look weird for a 2-pole differential filter One leg is 45kHz and the other looks like 7.34kHz, which means a 1nF cap should be an 82pF cap...?
yes, the one connected to pin 3...

Boky
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Old 22nd March 2011, 12:26 PM   #3740
kec is offline kec  United States
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Prairie,

Are those jumpers on the scheme ones you've added???

In other words, is your schematic with mods to the original???
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