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Old 15th April 2010, 01:29 AM   #201
acko is offline acko  Australia
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Default Availability

Quote:
Originally Posted by flocchini View Post
What is the time frame for availability of the DAC? Website shows out of stock.
Glad to see the success. Great implementation.

Best

Bob
DAC boards are actually due next week and the rest will follow soon. Assembled modules will take a longer time.
Regulator boards are available now.
I will post updates here also.

Regards, Acko
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Old 15th April 2010, 02:32 PM   #202
arco-35 is offline arco-35  Greece
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Acko,

From what I understand, the full package (and supposing that the regs will be bought in kit form...) should well reach the USD 1300 mark...

At this point, I would be grateful if I could have some clarifications regarding the questions here below:

1. What is the height of the PSU boards?
2. Do you think that the chosen chassis should be well ventilated?
3. Will all sub units be dispatched from Australia?
4. What will be your accepted methods of payment? And,
5. Is the I/V stage based on op amps? If yes, which ones?

Thanks and Regards,
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Old 15th April 2010, 03:03 PM   #203
qusp is offline qusp  Australia
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sorry misunderstanding. right, there is no high current shunting going on, so moderate ventilation should be provided, but I would not say lots of it, depends on which output stage you choose. if you choose the opamp I/V the OPA1632 is the wide soic variety which has a heat sink/pad on the underside, normaly OPA1632 do actually get quite warm, but still not much compared to mosfets etc. the height with it all stacked should not much exceed the height o the large heatsinks on the PSU I wouldnt think, even the 2 (or 3 with I/V) story stack of dac board and regs would not be overly tall. so I would think 3-4 inches would be fine

the PSU units, regs and dac are all very well integrated, so the ciurrents are chosen to match each next stage without too much overshoot, this will also keep heat to a minimum

Last edited by qusp; 15th April 2010 at 03:15 PM.
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Old 15th April 2010, 03:11 PM   #204
qusp is offline qusp  Australia
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also the I/V stage can be balanced OR single ended; the XLR version is based on OPA1632 only, the single ended version has additional AD797 to sum the outputs
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Old 16th April 2010, 07:37 PM   #205
pidesd is offline pidesd  Canada
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with the akc I2S how a the digital vol. control used? do i just need a pot and that s it?

Last edited by pidesd; 16th April 2010 at 07:45 PM.
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Old 16th April 2010, 07:52 PM   #206
jkeny is offline jkeny  Ireland
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Originally Posted by pidesd View Post
i m pretty sure rhere is a reason for it but...

why is not the kr3312 supplying both dvcc_t and dvcc_b?

did i missed something or maybe it cannot do 2X3.3v?

also with the akc I2S how a the digital vol. control used?
Remember this board is designed as a board for experimenters so all the individual supplies are independent - no assumptions were made about which supply was not of importance & can be overlooked (these assumptions have been made in the past & proved to be wrong). It is completely open to the builder, what supplies they use & how they might combine them. Now that the current requirements of each supply pin is known it is possible to decide which PS/regulators will suffice. Sonic considerations are another factor, however.
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Old 16th April 2010, 07:55 PM   #207
pidesd is offline pidesd  Canada
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yes i agree.

i edited my post because i though the kr3312 was 50$

my mistake
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Old 16th April 2010, 08:56 PM   #208
acko is offline acko  Australia
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Default Digital Vol Control

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Originally Posted by pidesd View Post
with the akc I2S how a the digital vol. control used? do i just need a pot and that s it?
Both versions of MCU have volume control function that is switch selectable. If enabled there is an on board pot can be used to control volume.

Regards, Acko
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Last edited by acko; 16th April 2010 at 09:14 PM.
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Old 16th April 2010, 09:13 PM   #209
acko is offline acko  Australia
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Default Psu

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Originally Posted by arco-35 View Post
Acko,
1. What is the height of the PSU boards?
2. Do you think that the chosen chassis should be well ventilated?
3. Will all sub units be dispatched from Australia?
4. What will be your accepted methods of payment? And,
5. Is the I/V stage based on op amps? If yes, which ones?
PSU board height = 25mm

Th AK PSUs, Regulators, DAC amd IV are all matched and runs cool if set up as shown in my previous post. Other combinations need to be tested and ventilation provided accordingly.

Currently all shipped from Australia. On-line ordering only, Paypal or credit card.

Version of IV stage shown is IC OpAmp based as explained by 'Qusp' but there will be more options available in future from other contributors to this project.

Regards, Acko
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File Type: jpg DAC and PSU.JPG (40.5 KB, 607 views)
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Old 16th April 2010, 09:16 PM   #210
jkeny is offline jkeny  Ireland
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Originally Posted by arco-35 View Post
Acko,

From what I understand, the full package (and supposing that the regs will be bought in kit form...) should well reach the USD 1300 mark...

...........
Thanks and Regards,
It probably would be a good idea to detail the various option packages & prices.
I have detailed the full package below (AFAIK) - please correct if there are errors:

DAC $250 - fully assembled
MCU $100 - Premium version
Voltage regs $340 - set of 6
I/V $100 -
SPDIF input $55
PS supply $175

Total $1020

Last edited by jkeny; 16th April 2010 at 09:19 PM.
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