DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 80 - diyAudio
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Old 27th October 2011, 08:44 AM   #791
erin is offline erin  Australia
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Location: http://www.makeitpossible.com/
Quote:
Originally Posted by Radian View Post
What I want to say is “why bother with complex if simple is way better?
Sometimes it is nice to have a ready made board that you can get running in an hour, and then tinker with components until you get the sound you like. We are discussing a stand alone DAC here, not mods and additions to sound cards and CD players!

Your comments are somewhat valid if modding a CD player with pre existing power supply and i2s lines. If building a stand alone DAC the "simple" suggestion as you put it involves point to point wiring, SSOP to DIL mounted on veroboard connected to power supplies with more point to wiring etc. etc. Then you need to find a way to mount the jungle of wires and boards to a case. IMO not so fun. But whatever does it for you. It actually takes more time and effort than a PCB we can buy from ebay.

Sound wise, probably not a lot of difference between PCB or point to point. Depends on your wire length and layout. PTP is more hit and miss. PCB from ebay works well - guaranteed. Either way gets you better sound at a cheaper price than buying a brand name DAC from the shop. Its still DIY Audio!

Thanks for your comments, but possibly in the wrong thread. We are discussing a stand alone DAC. Not sure, but perhaps your comments are better in the Vendors forum if you are trying to spruik your wares???

Last edited by erin; 27th October 2011 at 08:52 AM.
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Old 27th October 2011, 12:06 PM   #792
Radian is offline Radian  Germany
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Hi erin, I think you took my post the wrong way. I was not badmouthing this
dac as I bougt one myself to see what it's all about.
I just gave my logical conclusion based on what I did to get it singing.
Think about it. The active stage is just crap and can't compete with two
simple caps. That's not just a matter of taste, it's flat out missing on detail
separation of instruments and not close to the bass precision of the cap out
mod. So everything on the right side of the dac is not needed.
Then there is the regulators. Crap as well. So getting clean power to the
chips will take some effort. Not only that but the receiver needs clean
power too. But why do we need it ? So we can feed the dac I2S that the
source has converted to Spdiff.
Why in the world do we need too format conversions if we are dealing with a
board from the size of a wallet that can be put about one inch close to the
I2S source. No matter how much we tweak it, this Spdiff will not sound as
good as simple I2S transmission.
So taking all this into account. The SSOP 28 board with the dac on it will
sonically be better and it will not be more work to do it.

If one thinks he really needs Spdiff and already has this dac, then he can put
an AK4399 on an adapter board and connected it to the four resistors
feeding the AK4396.

Greets,
Klaus
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Old 27th October 2011, 12:25 PM   #793
erin is offline erin  Australia
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Thanks for your clarification. I now read your comments sort of like musings on the meaning of life. Now I get you. Please forgive my heavy handed reply.

I have been back and forth with i2s. I used to like it but always had incredible interference with clicks and pops even when using very short wires. (6cm)
I don't understand why I got the interference when other people don't have this problem.
FWIW I was even running my source off a battery. I think it was RF interference. Mostly when the washing machine motor turned off.

i2s is in theory the best way to run digital signal to the DAC. I just think in practice, from personal experience, that it is problematic, and system and location dependent, as to the sort of sound you will get. In an ideal setup, results will certainly be better than a SPDIF receiver. In an unlucky setup (like mine) it will cause frustration.
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Old 27th October 2011, 01:27 PM   #794
giulio is offline giulio  United Kingdom
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Klaus,

could you please post a link to the ebay seller of the better SSOP boards (those that allow close decoupling for AK4396) you refer to in your post 790?

Many thanks in advance
Giulio
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Old 27th October 2011, 02:10 PM   #795
rss388 is offline rss388  United States
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Quote:
Originally Posted by erin View Post
I was getting excited that there was a cheap board with an AK4399 and you had made a typo..... oh well... perhaps in a few years
Sorry. Somehow my head equated CS to AK....
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Old 27th October 2011, 04:22 PM   #796
Radian is offline Radian  Germany
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Quote:
Originally Posted by giulio View Post
Klaus,

could you please post a link to the ebay seller of the better SSOP boards (those that allow close decoupling for AK4396) you refer to in your post 790?

Many thanks in advance
Giulio
Here you go:
2PK SO SOP SOIC/SSOP 20/24/28 Pitch 0.6mm and 1.27mm to DIP Adapter Converter | eBay
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Old 27th October 2011, 05:37 PM   #797
jef9200 is offline jef9200  Belgium
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Hi all,
I give a try with the TAMradio transfo i've bought from Ebay ...and nothing..only noise (As Nosian). Just to be sure the dac is working, i want to use a capacitor output (+R/+L) to 100R resistors , 3.3uF mkp caps ; the two rca grounds to ground somewhere on the board.
is this OK ? Where can i find a suitable gnd on the board ?
Thanks.
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Old 27th October 2011, 07:09 PM   #798
Radian is offline Radian  Germany
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Quote:
Originally Posted by jef9200 View Post
Hi all,
I give a try with the TAMradio transfo i've bought from Ebay ...and nothing..only noise (As Nosian). Just to be sure the dac is working, i want to use a capacitor output (+R/+L) to 100R resistors , 3.3uF mkp caps ; the two rca grounds to ground somewhere on the board.
is this OK ? Where can i find a suitable gnd on the board ?
Thanks.
For a trial just use any ground you can find on the board.
.
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Old 27th October 2011, 08:24 PM   #799
Radian is offline Radian  Germany
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Join Date: Jun 2004
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Quote:
Originally Posted by erin View Post
Thanks for your clarification. I now read your comments sort of like musings on the meaning of life. Now I get you. .
I am glad that my English isn't good enough to get the real gist of
this phrase.

I had also a few issues with clicks and static noise at first but after using
twisted pairs and close grounding of each line it was just fine. Better than
spdiff for sure. If you see how far I2S is routed on some boards the challenge is just to get the grounding right.
One of the best purchases I did for DIY electronics was a very fine silver wire.
A touch of a second with the iron and it sticks easily to any small smt resistor or cap. If I place my board close to where I want to extract the I2S lines from, I just stick the fine silver wire with a tweezers through the pins on my board and pull them tightly up to solder. After that they can be painted with a fine brush a few times so the paint will be an insulator. Then liquite silver can be applied to go from the ground on one board via I2S silver wires to the ground of the other board. That will do it just fine.
On the first pic you can see that my longest I2S wire to my sound-card is only
3cm. It was just a quick and dirty job with hot glue and my old AK4396 boards,
so don't look to close. The paint an the liquid silver has yet to be applied.

The second pic is my QA550 player with our dac in discussion.

Greets,
Klaus
Attached Images
File Type: jpg I2S out.jpg (149.3 KB, 701 views)
File Type: jpg QA550-AK4396.jpg (148.1 KB, 672 views)

Last edited by Radian; 27th October 2011 at 08:28 PM.
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Old 28th October 2011, 03:42 AM   #800
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[QUOTE=Nosian;2758392]Although I did not put money on the coupling caps(suspicious at the beginning). 10uf Nichicon ES (says better than BG N serie) on 0.1uf pio CCCP to the attenuator and 10uf Nichi to the gnd. /QUOTE]

Did you put a series resistor between output pin and capacitor and if you did, what value did you use?

Thanks, Joe
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