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Old 31st January 2013, 11:04 AM   #701
qusp is offline qusp  Australia
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no way! decoupling what? the signal?
are you sure the clock driver on waveIO even has enough drive to drive 3 inputs? just remap internally IMO

Last edited by qusp; 31st January 2013 at 11:07 AM.
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Old 31st January 2013, 12:08 PM   #702
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On second thought, I realize decoupling is a very bad idea and that I just made a fool out of myself. I don't know what I was thinking

Regarding the fanout, I figured the data lines should be able to drive 3 inputs if it works correctly with the Buffalo 2, since it internally (as in on the PCB) connects several inputs together. Basically, what I want to do is this and if I understand Dustin correctly here the only way to support I2S/DSD/SPDIF that way is to short D1 to D5 and D2 to D4 to D6 since the internal switching do not cover this. Since I don't want to hack into the ackoDAC PCB I thought I'd do it externally, but really, the result should be the same.
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Old 31st January 2013, 04:21 PM   #703
acko is offline acko  Australia
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Default fanout

Quote:
Originally Posted by Emphrygian View Post

Regarding the fanout, I figured the data lines should be able to drive 3 inputs if it works correctly with the Buffalo 2, since it internally (as in on the PCB) connects several inputs together. Basically, what I want to do is this and if I understand Dustin correctly here the only way to support I2S/DSD/SPDIF that way is to short D1 to D5 and D2 to D4 to D6 since the internal switching do not cover this. Since I don't want to hack into the ackoDAC PCB I thought I'd do it externally, but really, the result should be the same.
This should work fine. It is the cable capacitance the would affect the drive from WaveIO so keep it as short as possible. Of course each input has its own 'gate' capacitance. Combining inputs (on-board or externally) increases the effective capacitance so a buffer after WaveIO could be useful especially if you are looking forward to dual mono fanout
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Last edited by acko; 31st January 2013 at 04:34 PM.
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Old 5th February 2013, 01:35 PM   #704
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Thanks acko. Should I worry about trace impedance and reflections?
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Old 6th February 2013, 07:08 AM   #705
acko is offline acko  Australia
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Default Remapped Connections I2S/DSD

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Originally Posted by Emphrygian View Post
Thanks acko. Should I worry about trace impedance and reflections?
It is best to used a small adapter with all the w.fl coax connected as shown. Then use a short length of w.fl cable assy from this adapter to DAC
Can be made to match the type of transport used. Shown is for SDTrans384. Others similar. What is your transport?

Edit: LRCK/DSD1 should be LRCK/DSD2
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Last edited by acko; 6th February 2013 at 07:11 AM.
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Old 6th February 2013, 08:38 AM   #706
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I'm planning to use the WaveIO (which uses u.fl for I2S), but who knows what the future holds...

The (current) design of my PCB is very similar to your picture, apart from being modular, i.e. 1 input u.fl and footprints for 3 output w.fls per PCB. Maybe I should make it a one PCB solution like yours, as this will be neater and there's no need to connect resistors to ground on unused connector footprints to minimize reflections.

I thought I'd be clever and save money on manufacturing as few PCBs I don't need as possible, but all things considered, maybe it's not such a good idea after all. Also, the additional cost will be quite small considering the cost of the rest of the build
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Old 18th February 2013, 11:07 PM   #707
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by acko View Post
... Shown is for SDTrans384. ...
Is the board ready to be distributed like Amanero reclocker board?

By the way, have you integrated your turbo clock board with SDTrans?
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Old 22nd February 2013, 04:03 AM   #708
acko is offline acko  Australia
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Quote:
Originally Posted by Bunpei View Post
Is the board ready to be distributed like Amanero reclocker board?

By the way, have you integrated your turbo clock board with SDTrans?
Board shown was for reference only to indicate fan-out to AKD12P module. Prefer to use the Amanero Isolator/Reclocker type board as isolating the SDTrans FPGA is beneficial- plus the re-clocking. Of course, a board to fit the SDTrans nicely can be made for those who are interested-min qty applies.

I will test the Turbo clock unit with SDTrans when the Reclocker boards are ready.
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Old 7th March 2013, 03:28 AM   #709
acko is offline acko  Australia
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Default AKD16 Re-release

There has been some updates to this 9016 DAC board. New version has inputs re-mapped for stereo I2S/DSD and 2CH Spdif (TTL). Board layout has been further improved and now with U.FL coax for direct connection to popular transports. Available as bare boards and chip mounted options.
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File Type: png AKD16-BB.png (292.2 KB, 916 views)
File Type: png AKD16-CP.png (506.6 KB, 882 views)
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Old 27th May 2013, 09:54 AM   #710
acko is offline acko  Australia
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Default 9016 DAC Combo

Hi,

Some updates of on a complete DAC system based on 9016. This combo board has both DAC and IV cct integrated as shown. Shown panelized with the options to detach IV and re-mount/stack if desired.
DAC side has LDOs for both digital and analog side and can be powered by a single external 5V-12V supply. Analog AVCC has mounting options for 3-term shunt regs or similar.
IV stage requires symmetrical supplies (+/-5-to +/-15V). Both SE and Balanced outputs. Clock and controller are external-TBA. Physical board will be available in ~4wks
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