Sorry for the double post, can't edit the old one.
I have a question about this DAC - When no music is playing, with headphones I can hear a veryyy silent repeating, irregular rhythm noise - trrr trrrrr trr trrttt trrr trrrrr trr trrtttt. It's so silent that it can be barely heard with headphones, but I'm wandering what could be the reason?
Sometimes there is another noise which appears when someone has used the USB to charge a device (mp3 player). It is more audible, but it disappears when I restart the DAC.
I have a question about this DAC - When no music is playing, with headphones I can hear a veryyy silent repeating, irregular rhythm noise - trrr trrrrr trr trrttt trrr trrrrr trr trrtttt. It's so silent that it can be barely heard with headphones, but I'm wandering what could be the reason?
Sometimes there is another noise which appears when someone has used the USB to charge a device (mp3 player). It is more audible, but it disappears when I restart the DAC.
Interesting thread to follow, quite a read!
I noticed in the ak4396 datasheet it has a 'digital attenuator', but I can't find anything on it in this thread. Any particular reason? Not possible in combination with the ebay-board? No need? Or just the old 'digital volume control?', no way!
-Mike
I noticed in the ak4396 datasheet it has a 'digital attenuator', but I can't find anything on it in this thread. Any particular reason? Not possible in combination with the ebay-board? No need? Or just the old 'digital volume control?', no way!
-Mike
Strange... are you sure you used ON Semi MC78xx/79xx?
They should sound fuller and tighter than ST ones.
I bought the regulators from farnell, each came with a nice black cardboard box like for a wedding ring.
Hi, can anybody address me to a reliable ebay seller for Cerafine and/or Silmic?
Second question: almost all high-end voltage regulators I've seen are single voltage type; but, in my opinion, op-amp should work better when powered with a dual tracking supply (less problems with common mode voltages caused by static or dynamic supply unbalance).
I'm planning to power the op-amp of the AK4396 board with a dual tracking Toshiba M5230 (output impedance less than 0.1 ohm up to 100 KHz, noise typ. 12 uVrms from 20 Hz to 100 KHz) with a separate supply (filtered with a C-multiplier) for analog +3.3V and +5V.
What do you think about?
Second question: almost all high-end voltage regulators I've seen are single voltage type; but, in my opinion, op-amp should work better when powered with a dual tracking supply (less problems with common mode voltages caused by static or dynamic supply unbalance).
I'm planning to power the op-amp of the AK4396 board with a dual tracking Toshiba M5230 (output impedance less than 0.1 ohm up to 100 KHz, noise typ. 12 uVrms from 20 Hz to 100 KHz) with a separate supply (filtered with a C-multiplier) for analog +3.3V and +5V.
What do you think about?
I wouldn't buy any surface mounts from Ebay dealers. I've done it in the past and been sorry. There is real product on Ebay, the problem is you don't know who is honest and who isnt. Parts-Connexion has Silmics, and there has to be someone in Italy that sells them.
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Good point. If this really means "digitally controlled analogue attenuator", this is something for investigating seriously. If so, I don't think it is applicable for ebay kit. It would be a good subject of new dac project.
EDIT:
Page 23 states that attenuation is done via "digitally" front of dac which means it is not such thing like "digitally controlled analogue attenuator".
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Hi Fulvio,
in Italy there is AudioSelection that sells Cerafines but both HiFiCollective (UK) and PartsConnexion (US) are cheaper.
If you buy from PCX you can also buy PRPs and shipping is less than AudioSelection (9.5US$ vs 9.6€...), the only drawback is time: it will take a month to receive the packet...
On my DAC kit the PCB traces were shorted between pins as follows:
(this is correct according to the kit's schematics and my DAC certainly works – very well)
On the AK4393/6:
12 shorted to 13
15 shorted to 16
17 shorted to 18
27 and 28 are shown as shorted to GND on the schematic.
On the CS8416,
10 shorted to 11 (and GND)
20 shorted to 21
You should be able to see, between the pins, where the PCB traces have joined/shorted them.
Hi, been reading the thread with interest as I got a 4396 for christmas.
Mine was fully assembled.
I have just been swapping op-amps and I notice that mine looks different from the ebay pic I bought it from and from your versions.
I refer to all the orange caps.
Has anyone any thoughts about these caps, whether they should stay or be replaced with Wimas.
cheers
Mine was fully assembled.
I have just been swapping op-amps and I notice that mine looks different from the ebay pic I bought it from and from your versions.
I refer to all the orange caps.
An externally hosted image should be here but it was not working when we last tested it.
Has anyone any thoughts about these caps, whether they should stay or be replaced with Wimas.
cheers