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DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
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Old 18th August 2011, 10:42 PM   #531
sharpi31 is offline sharpi31  United Kingdom
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DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
Hi Nosian,

Sowter 9545 (and the recommended loading) should be used with current output dacs, not voltage output dacs like the AK4393/5/6. A very different beast altogether.....

I wouldn't even try using these transformers - you may even damage the dac if you use the primary loading you detail (way less than the 1Kohm minimum AC load).

Buy a current output dac kit and use the Sowters with that (I'm sure it would be great). For the AK4396, buy a couple of half decent 600ohm 1:1 transformers on ebay for $30.
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Old 19th August 2011, 12:16 AM   #532
sterlingmck is offline sterlingmck  Australia
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Default Voltage Regs

Clavefremen

On you BOM you spec a 12 v regulator replacing the 15 v regs.
Is there ary technical reason for doing so
I understand the the circuit will work with both voltages but the 12 v may run hotter as the voltage drop is higher
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Old 19th August 2011, 12:57 AM   #533
ClaveFremen is offline ClaveFremen  Italy
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DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
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Originally Posted by sterlingmck View Post
On you BOM you spec a 12 v regulator replacing the 15 v regs.
Is there ary technical reason for doing so
I understand the the circuit will work with both voltages but the 12 v may run hotter as the voltage drop is higher
No, just to use the same voltage rating of the original kit.

In fact the MC7815/7915 are even better performing (in my definitive DAC I'm using 15V ones).
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Old 19th August 2011, 07:06 AM   #534
Trebla is offline Trebla  United Kingdom
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Clave.

The recommendation for Wima FKP2 at C1 is a good one.
I've always used MKP1837, but i think the Wima in this case is more open sounding.
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Old 19th August 2011, 07:45 AM   #535
fmahia is offline fmahia  France
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I've also used successfully a Styroflex cap at C1.

Could someone show me a simple transformer output schema for the AK4396 with unbalanced outputs?

I've looked for different solutions but I don't know enough about that to choose the right one.
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Old 19th August 2011, 08:56 AM   #536
jeffzen is offline jeffzen
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Quote:
Originally Posted by DirtBag View Post
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..
You'll need an output transformer. With such a low load (32 ohms) directly on the DAC's output, it will be definitely damaged.
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Old 19th August 2011, 10:32 AM   #537
ClaveFremen is offline ClaveFremen  Italy
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Originally Posted by Trebla View Post
The recommendation for Wima FKP2 at C1 is a good one.
I've always used MKP1837, but i think the Wima in this case is more open sounding.
Thanks Trebla,

I agree, in fact I've tried also MKP1837 and ERO KP1830, both were less good...
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Old 19th August 2011, 01:42 PM   #538
data is offline data  Australia
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In the data sheet for the AK4396, it states "When AOUT drives some capacitive load, some resistor should be added in series between AOUT and capacitive load" A capacitive load being either a cap or transformer.

To me this is indicating that being a voltage output DAC like the CS4398, it does require a load (resistor) of some value in series on the analogue outs.

Someone earlier said it does not, well this has been bugging me as I know that the CS4398 requires it and it also is a Differential DAC and a voltage output DAC, in this respect just like the AK4396.

Looking at the suggested circuits in the data sheet, also indicates resistors in series.

If I were doing a transformer output with this chip, I would use resistors in series on the outputs, what value? I'm not sure, but I'm thinking 1.5k for some reason. So using a pair of 600ohm transformers like I have on my DAC I would be looking at 1k resistors on each of the 4 legs in series between the chip and transformers.
But I could be wrong on this figure.

If anyone is thinking of transformers, double check before taking my advise.

Just my thoughts

Last edited by data; 19th August 2011 at 01:52 PM.
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Old 19th August 2011, 01:47 PM   #539
jean-paul is offline jean-paul  Netherlands
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When loaded with a capacitance it needs a series resistor, yes. Loading it with a transformer is slightly another case. I know from experience that CS4397/98 can be loaded directly with transformers with very good results and nothing will break. However, I used 470 Ohm at each output in series to the transformer for current limiting at power-on. I also hoped that it would avoid magnetization because of a possible current at power-on.

It should not be needed as both outputs are at 2,5 V. But I can not guarantee why happens at power-on so I used the resistors.
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Last edited by jean-paul; 19th August 2011 at 01:54 PM.
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Old 19th August 2011, 01:59 PM   #540
data is offline data  Australia
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Hah...I'm using 470 ohms on my CS4398 too
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