DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 151 - diyAudio
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Old 3rd April 2012, 08:02 PM   #1501
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Quote:
Originally Posted by merlin2069er View Post
Are you talking about this?

Mikrolampizator
No, but that one has/would be ripped to shreds on this forum too
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Old 3rd April 2012, 08:11 PM   #1502
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Ok, how about using my dcb1 buffer on the output of the dac chip? (instead of the opamp.)
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Old 3rd April 2012, 09:25 PM   #1503
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Default I2S USB Input

I have used a USB convertor that outputs I2S straight to the DAC.
Also I have compared this to SPDIF using the complete DAC modified to Dario's BOM.
My current configuration is USB to I2S straight to the DAC.
Digital regulators as per the BOM.
Belleson 5v regulator for the analog side of the DAC
Auricap 3.9 uF capacitors straight from the DAC.
As soon as the I2S was connected (keep the connections as short as possible) the sound seemed to slow down, very relaxed.
I tried different brands of capacitor, but this is very critical and the best quality cap is important.
Bass is all present as the DAC is feeding into a high input impedence and the Cap is large enough to keep the low frequency rolloff below audiable frequency.
I know many would not agree with using a cap but I have tried differnt op amps, SRPP output stage, cheap output transformers, unbalancer and have found that simpler seems to work well
Good quality voltage regulation is also important (as it is with all audio)

Mark

Quote:
Originally Posted by merlin2069er View Post
Hey, I joined the party. I picked up a AK4396 dac kit on ebay.

I have a few mod ideas... not sure if I'll implement them all.

- not sure if replacing on-board regulators will help (but I do have some Super Teddy Regs) to use

- going to bypass the opamp and use a srpp triode output using 6n16b miniature tubes

- I'd prefer using a usb transport with this dac - not sure if I'll simply go thru spif or maybe a way to get usb to i2s into this dac ?
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Old 3rd April 2012, 09:46 PM   #1504
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Quote:
Originally Posted by sterlingmck View Post
As soon as the I2S was connected (keep the connections as short as possible) the sound seemed to slow down, very relaxed.
Mark
Can't tell if you are saying this is an improvement or a reduction in quality ???
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Old 4th April 2012, 07:25 AM   #1505
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Default I2S

Quote:
Originally Posted by bcmbob View Post
Can't tell if you are saying this is an improvement or a reduction in quality ???
This is a massive improvement.
If you are using a pc as a source, then USB to I2S then straight to a DAC is far better that having 2 SPDIF conversions

This made more difference ( for the better ) than all of the mods to the output analog circuit

Mark
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Old 4th April 2012, 10:09 AM   #1506
bcmbob is offline bcmbob  United States
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Understood, Thanks
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Old 4th April 2012, 11:33 AM   #1507
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Quote:
Originally Posted by sterlingmck View Post
I have used a USB convertor that outputs I2S straight to the DAC.
Also I have compared this to SPDIF using the complete DAC modified to Dario's BOM.
My current configuration is USB to I2S straight to the DAC.
Which specific converter USB/I2S (eBay?) are you using? Any photos available?

Quote:
Auricap 3.9 uF capacitors straight from the DAC.
How is it wired at the output? Just cap or cap + resistor? Where does it go to from there: preamp, volume pot, power amp?

Very interesting approach, Mark. Both on input and output. And regulators, of course.
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Old 4th April 2012, 12:07 PM   #1508
bcmbob is offline bcmbob  United States
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Dario, could you post a straight top down picture of your current populated board? I've been browsing through several builders photos and see a few discrepancies. Since many are working from your upgrade BOM, it would be nice to establish a reference from you. I'm not sure if the picture at your Google docs page represents your latest PCB population.

Thanks.
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Old 4th April 2012, 08:18 PM   #1509
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Quote:
Originally Posted by merlin2069er View Post
Ok, how about using my dcb1 buffer on the output of the dac chip? (instead of the opamp.)
Whatever output solution you choose, it should sum the differential outputs properly. A single DCB1 won't do that-
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Old 4th April 2012, 08:25 PM   #1510
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yeah I was about to point out that that srpp micro-lampizator thingy wont work either. Broskie unbalancer will work.
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