DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 123 - diyAudio
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Old 12th February 2012, 07:57 PM   #1221
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I finally finished my dac

some pics, enjoy...

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Old 12th February 2012, 08:23 PM   #1222
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Quote:
Originally Posted by swanny50 View Post
thank for the reply, yes everything is stock. but looking for solutions, do any of my other parts help ?
You can use my upgrade BOM, if you want, you'll get a more balanced sound, more bass and refinement.

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Originally Posted by apoopoo999 View Post
I finally finished my dac

some pics, enjoy...
Wow, impressive work!
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Old 12th February 2012, 08:29 PM   #1223
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Wow, impressive work!

Thanks
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Old 12th February 2012, 08:31 PM   #1224
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Ah, I see, thanks for that.
Looks like they will have to come out then.
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Old 12th February 2012, 11:05 PM   #1225
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Originally Posted by apoopoo999 View Post
chinese designer originally designed the board for ak4393. When he upgraded the chip to ak4396 he didnt bother to revise the pcb.
Ah, I see, thanks for that.
Looks like they will have to come out then.
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Old 13th February 2012, 07:03 PM   #1226
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I finally made it as described here #1151. listened during the weekend. direct mode only caps out. and it sounds wonderful very clean, rhythmic and detailed. the base is growing up by burning days(new board). interesting to see how long will the batteries will last!

thought it maybe helps putting some fat caps on every battery pack? but not sure. damaging the chips?
they have their 10-100uf directly on the chips pins, any idea?
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Old 13th February 2012, 07:30 PM   #1227
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Originally Posted by Nosian View Post
I finally made it as described here #1151. listened during the weekend. direct mode only caps out. and it sounds wonderful very clean, rhythmic and detailed. the base is growing up by burning days(new board). interesting to see how long will the batteries will last!

thought it maybe helps putting some fat caps on every battery pack? but not sure. damaging the chips?
they have their 10-100uf directly on the chips pins, any idea?
Hi, could you please describe your output arrangement, caps only, as I would like to ditch the opamp.
With pics if poss.
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Old 13th February 2012, 08:32 PM   #1228
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j baldam
here is the thread and the hole discussions about it pics and everything:
AK4396: best solution for output stage

direct out sounds relaxed but still rhythmic vs opamp that sounds stressed and closed. i have 2 modded boards to compare.

Last edited by Nosian; 13th February 2012 at 08:45 PM.
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Old 17th February 2012, 08:49 PM   #1229
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hi, would anyone know the ideal input spdif voltage that the dac would like to see.
I ask as I have taken a direct feed from my philips CD940 and a resistor in series and one to ground is specified.
If there is an ideal voltage then this would determine the resistor value.

I have done exactly the same as this except I have used screened cable.
Would there be any mileage in grounding the screen at one end to the pcb ground plane?

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Last edited by j baldam; 17th February 2012 at 08:54 PM.
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Old 17th February 2012, 10:45 PM   #1230
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Originally Posted by j baldam View Post
hi, would anyone know the ideal input spdif voltage that the dac would like to see.
I ask as I have taken a direct feed from my philips CD940 and a resistor in series and one to ground is specified.
If there is an ideal voltage then this would determine the resistor value.

I have done exactly the same as this except I have used screened cable.
Would there be any mileage in grounding the screen at one end to the pcb ground plane?
Looks like that's a 74HC08 IC driving the SPDIF? Is it operating on a 5V supply?

If you check the datasheet for the CS8416 it shows how to interface with logic ICs. Page 50 here:
http://www.cirrus.com/en/pubs/proDat.../CS8416_F3.pdf

Basically just remove the 75R resistor, and leave the cap. However, if your HC08 is driving 5V, you'll need to drop this a bit as the CS8416 is operating on 3.3V, the maximum input voltage will be 3.6V. To satisfy this, I'd recommend replacing the 75R with a 1.5k and add a 750 ohm in series.

From the datasheet, looks like a valid low signal will be 1.65 - 0.1 = -0.3V-1.55V and high 1.65 + 0.1 = 1.75V-3.6V. Since it's AC coupled, any signal with an amplitude greater than 0.2V will work, but less than 3.9V.

You should ground your screened coax at one end, at the very least. Whether you ground it at the other end is more complicated.
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