DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 53 - diyAudio
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Old 17th August 2011, 07:41 AM   #521
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Cheers.

Just the I remember something about 1k when I was trying it with a SRC2496.

Anyway, good to know, now I just have to work out if one of these will out perform the CS4398 in my sig' ?

What ya' think? anyone compared yet?
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Old 17th August 2011, 12:46 PM   #522
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Hi noob here about to buy a DAC for my PC and use SPDIF from my motherboard and hope it will sound better than my current Mini USB PCM2704 DAC have a q about the power requirements tho as it would be neater to run it all from my pc can i just rig up the 12v from my PSU to the rectifier outputs? would i need the 12v regulators?
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Old 17th August 2011, 06:30 PM   #523
Ryssen is offline Ryssen  Sweden
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Hello,been reading the thread and ordered a AK4398 kit.
Going to mod it,I have a bag of Elna serafin 47uF/35v and a bag of Oscon 10uF,wich one of these to use for excanging the 10uF e-lyts on the board?
As I havent gotten the pcb yet,what are the diameter maximum on the biggest e-lyts and the secon biggest one.

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Åke
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Old 17th August 2011, 07:00 PM   #524
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Quote:
Originally Posted by Ryssen View Post
Going to mod it,I have a bag of Elna serafin 47uF/35v and a bag of Oscon 10uF,wich one of these to use for excanging the 10uF e-lyts on the board?
As I havent gotten the pcb yet,what are the diameter maximum on the biggest e-lyts and the secon biggest one.
Hi Åke,

the Cerafines are the most suitable caps but I fear they're too big...

Quite all position can accomodate only 6.3mm caps, though some can be tightly fitted with 8mm ones.
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Old 17th August 2011, 07:02 PM   #525
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Originally Posted by DirtBag View Post
Hi noob here about to buy a DAC for my PC and use SPDIF from my motherboard and hope it will sound better than my current Mini USB PCM2704 DAC have a q about the power requirements tho as it would be neater to run it all from my pc can i just rig up the 12v from my PSU to the rectifier outputs? would i need the 12v regulators?
It will definitely sound better than your PCM2704 DAC, I can tell you that for sure, because I also own a DIY PCM2704.

I'm also sure that your PSU's +12V would be powerful enough for the DAC, as it consumes only about 6 Watts on the +12V. On the other hand, the DAC needs a -12V supply as well, on which most PC PSUs can deliver very low amount of power. (mine can do 12W only) However, the DAC consumes only about 1 Watt on the -12V, so it could work, but check your PSU's capabilities first.

All branches of a PC PSU are regulated, so you wouldn't need the +12V/-12V regulators.

Despite the fact that connecting this DAC to your PC PSU would absolutely work, I do NOT recommend using it that way, because the noisy supply from a PC would totally ruin the sound.
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Old 17th August 2011, 07:15 PM   #526
Ryssen is offline Ryssen  Sweden
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Quote:
Originally Posted by ClaveFremen View Post
Hi Åke,

the Cerafines are the most suitable caps but I fear they're too big...

Quite all position can accomodate only 6.3mm caps, though some can be tightly fitted with 8mm ones.
The serafine are 10mm,so I guess I have to wait for the pcb to se if I can fit them.
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Old 17th August 2011, 10:57 PM   #527
Ryssen is offline Ryssen  Sweden
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I read in the datasheet for AK4396 that audio out is 2,8vpp.
does that meab that if I use the LL1571 wich has a ratio of 1:1,75,that I get
4,9v out p-p?
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Old 18th August 2011, 05:40 AM   #528
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Originally Posted by jeffzen View Post
It will definitely sound better than your PCM2704 DAC, I can tell you that for sure, because I also own a DIY PCM2704.

I'm also sure that your PSU's +12V would be powerful enough for the DAC, as it consumes only about 6 Watts on the +12V. On the other hand, the DAC needs a -12V supply as well, on which most PC PSUs can deliver very low amount of power. (mine can do 12W only) However, the DAC consumes only about 1 Watt on the -12V, so it could work, but check your PSU's capabilities first.

All branches of a PC PSU are regulated, so you wouldn't need the +12V/-12V regulators.

Despite the fact that connecting this DAC to your PC PSU would absolutely work, I do NOT recommend using it that way, because the noisy supply from a PC would totally ruin the sound.
ok thanks for advice i will use transformer i have but it only has +12v Can I do without opamp stage if im using 32ohm headphones with this DAC? the pcm2704 i have just has a couple of capacitors between output and headphone..
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Old 18th August 2011, 09:07 PM   #529
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Originally Posted by sharpi31 View Post
No need to use the 4x 2.4Kohm resistors with transformers. I use small 5ohm resistors between the dac and the transformers, which seems fine.

The AK4396 datasheet calls for minimum 1Kohm AC and 1.5Kohm DC load. With a transformer the DC load is essentially infinite (as there is 2.5VDC at either end of the primary) so that's covered. The AC load will ultimately be determined by the load connected to the secondary, so typically 10-100Kohm.

This all assumes you use a 1:1 transformer - with other ratios you'd need to check the reflected impedance etc. I don't see any need for anything other than 1:1, and have used many different 600ohm transformers to great effect.
thanks, but I've already got a pair of Sowter 9545:
PRIMARY DC RESISTANCE 10 ohms (in parallel)
SECONDARY DC RESISTANCE 900 + 900 ohms
RATIO 1+1 : 5+5
SUGGESTED I/V RESISTOR:
Parallel primaries 100 ohms
Separate primaries 200 ohms

it takes the balanced output of AK4396. do you think the 5ohm resistor is still suitable? or something ells?
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Old 18th August 2011, 09:29 PM   #530
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Originally Posted by erin View Post
I was asked for some photos of what I have done.
You can see the 22000uf capacitors. The bridge rectifiers have been removed from the board and I have mounted different bridge rectifiers off the board before the caps. It should be self explanatory. You can also see the Silmics decouping the op-amp.....
hi Erin, i'm still a little confuse about this. It means you bypass the original 2200uf with those blue 22000uf?
so one could remove the bad originals (in my case KMG) completely in exchange with 22000uf?
Is this a good choice?
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