DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 79 - diyAudio
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Old 26th October 2011, 01:01 PM   #781
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on stage to provide Volume Control and buffering for a 125ASX2 Icepower module?

I must admit, I'm not sure I understand what the Servo stage will do for me - is it to reduce DC offset and remove the need for coupling capacitors? The input to the 125ASX2 already has an LPF with a coupling capacitor, so I'm not sure if the added complexity of the Servo stage is required/necessary/beneficial in this case, and it may be just as good to have a simpler design - thoughts?
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Old 26th October 2011, 03:55 PM   #782
rss388 is offline rss388  United States
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I just received my DAC kit from China. It turns out I bought one with SPDIF and USB input (CS8616) and the DAC chip actually is an AK4398. The kit came with LPF values same as for CS4393 but looking at the 4398 data sheet CS suggests different values. Anyone has any experience there? Also the data sheet suggest COG caps and I can get some SMD COG caps to solder onto the board but I can also get THT polystryrene / polypropylene caps. Which way should I go?
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Old 26th October 2011, 05:21 PM   #783
Radian is offline Radian  Germany
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Location: Wiesbaden
Quote:
Originally Posted by Nosian View Post
My first try to get Ak4396 kit work in direct mood was a failure. But I keep trying by working on the volume control as Sandller advice. It is a shunt attenuator with 10k shunt resistor parallel. I replaced it with a 2.4k carbon foil same value from AK4396 datasheet. And it made the trix.
I replaced the 3 elctrolytics in power supply too, thanks to Erin. Three Mundorf 15000uf are playing the bass notes to Patricia Barber’s “Autumn Leaves”.

The sound is totally different vs the same board with a LME49720. I have made two, the only way to get own experience in this endless discussions.
Direct mood sounds very relaxed filling bass slam in stomach. Although rhythm and pace is there, more obvious, intimate yes sexy. Never experienced from a digital source before, maybe 12 years ago from a Linn top player.
The board with opamp sounds good. Every thing is there but fasten, stressed someone called it, hard not enjoyable as direct mood.

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. I guess the PIOs are not suitable in this bypass. Problem with big orchestral! Teflon may works better? Waiting from Russia by doller.
Looking to Jantzen Superior or Silver mkp as well vs Mundorf silver/oil witch costs double! Do not know if the they worth the price (2x €53 for 4.7uf)
Any suggestion that is easy to order from Europe?
Here you go. Good job. Finally someone with courage to go against the traditional engineering. I don't understand how people can be to stubborn
to try this 10 minute no cost tweak. The " I did it once on a dac and din't like
it crowd" don't know what they are missing with the AKM dacs.
.
.
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Old 26th October 2011, 05:51 PM   #784
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Hmm not sure what happened to my post above.

It was in reference to this: eBay - New & used electronics, cars, apparel, collectibles, sporting goods & more at low prices

Could somebody explain to me what the Servo stage is for? Is it to remove DC Offset and thus remove the need for coupling capacitors? Does this look to be a good board to use between the 4396 DAC kit and an ICEPOWER 125ASX2 module?

Appreciate any advice. Thanks, Simon
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Old 26th October 2011, 11:51 PM   #785
erin is offline erin  Australia
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Quote:
Originally Posted by rss388 View Post
I just received my DAC kit from China. It turns out I bought one with SPDIF and USB input (CS8616) and the DAC chip actually is an AK4398.
could you kindly supply the link to this kit. I could not find it?
thanks
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Old 26th October 2011, 11:57 PM   #786
rss388 is offline rss388  United States
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Quote:
Originally Posted by erin View Post
could you kindly supply the link to this kit. I could not find it?
thanks
Hello, this is the kit I bought:

http://www.ebay.com/itm/Best-CS8416-...99589617028821

You can see the filter components around the op amp is the same as for CS4393 but looking at the data sheet for CS 4398 there are very different values. I did confirm it is a CS4398 since the pinouts are different.
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Old 27th October 2011, 12:23 AM   #787
erin is offline erin  Australia
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OK, so it has a CS4398 DAC! You wrote earlier that it had an AK4398 DAC
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Old 27th October 2011, 12:24 AM   #788
rss388 is offline rss388  United States
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Oops! Sorry!
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Old 27th October 2011, 12:33 AM   #789
erin is offline erin  Australia
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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
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Old 27th October 2011, 08:29 AM   #790
Radian is offline Radian  Germany
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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
Actually, why do we need ready made dacs anyway. As soon as we get them
we start to take off half of the components and substitute them with better
ones. I don't even use the receiver of this AK4396 dac-board. Straight I2S
from my SD player to the dac chip. For better sonics I also bypass the whole
active stage. So what I am left with is just a board that holds the dac chip.
SSOP 28 boards with the AK4396 already soldered on them cost about $ 12
and the better SSOP boards that have near by decoupling possibilities cost
about $2 and the AK4396 from the same seller $5. Simple star earth wiring,
few .1 µf caps and Salas shunt regs will get you into sonic bliss rivalling
commercial offering even up to five digits price tags.
Same can be made for the AK4399 that I have seen selling for $23 on ebay.
Extracting the I2S signals from any gear is not rocket science. If the wires are
kept short which is easy to achieve with those little boards all is fine.
I am about to hook them up to a Envy24ht soundcard for pc crossover tests.
What I want to say is “why bother with complex if simple is way better?

Greets,
Klaus
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