Build thread for ES9023 + JG Buffer boards (betatest) - Page 12 - diyAudio
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Old 21st May 2013, 11:28 PM   #111
Mull3t is offline Mull3t  United States
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Join Date: Apr 2012
Location: Gamehendge
Quote:
Originally Posted by curryman View Post
There is a MCLK In/Out header on board that could be used to feed external circuits with onboard XO signal. Just place a suitable R at J2 position (0603 case).
So if I use MCLK out, I'm still sending the DAC MCLK? ie MCLK -> DAC, same MCLK -> re-clocker so they are in pseudo-sync.

Quote:
Would be possible too. Just don't stuff the XO to the DAC board and close J2 to feed external MCLK to ES9023
This seems like the best option for sync mode.

Quote:
If you don't use onboard XO you don't need the corresponding power supply (regs, Cs,...) of course. MCLK 1:4 is indeed intended for SPDIF or USB receiver, e.g. TENOR or WM8804 which need 12MHz clock (use 48MHz XO for ES9023 in this case). If you don't want to use the 1:4 option you don't need to stuff the flipflops and the corresponding power supply (regs, Cs, Ls,...)
This is good to know. I don't really need to use WM8804(5) or TENOR so I'll leave this part of the board empty.

Quote:
All of the above options would be very interesting tests. Would be nice to see if the the amanero reclocker performs better than the internal recocking of the ES9023. I thought just using isolation might be the best in this case but who knows...

Best regards, Daniel
Yes, I'm really glad you're giving the board so many options and that Acko has built a few really nice boards that can possibly enhance your project.

What would the implications of using one 5v power supply to provide power for the DAC board, external clock, and isolator/re-clocker board. I know I'd have to find out current requirements but would one really nice supply like the Sigma 11? The σ11 Regulated Power Supply

I'd like to use something like the Sigma 25, but I'm not sure it's up to the task...
The σ25 Regulated Power Supply

Here is Acko's clock board, which at the bottom of his post has the possible options for re-clocking...
Amanero Isolator/Reclocker GB
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Old 24th May 2013, 09:13 PM   #112
Mull3t is offline Mull3t  United States
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@curryman - quick question. I'm curious if the Acko Re-clocker board with the faster flipflops using 2 Potato Semi PO74G74A http://www.potatosemi.com/potatosemi...t/PO74G74A.pdf ...would work here? The fact that your board has U.FL connectors helps. I'm wondering if you think your other design considerations would allow for such re-clocking to be feasible? Here's a post that might be applicable...

Amanero Isolator/Reclocker GB

I'm just putting all this stuff out there so everyone knows what's possible.
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Old 25th May 2013, 06:47 PM   #113
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To be honest I am not sure if (additional) reclocking helps in combination with the ES9023 (and also the other ESS DACs with internal "reclocking"), but I did my best to achieve a good board layout with respect to high speed digital signals. This includes the U.FL connectors as well as a (simulated) trace impedance close to 50 Ohm. Also the uninterrupted GND plane should help here.

I did not put too much thoughts into this reclocking nor did I test it but I would probably go the FIFO route. To me it makes more sense to "do it right" if you don't have any problems with the latency.

Best regards, Daniel
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Old 28th May 2013, 05:28 AM   #114
Mull3t is offline Mull3t  United States
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Good to know your thoughts on re-clocking.

Board arrived! Thanks a million!

I'm still going to experiment because your board offers the flexibility in doing so. I'm planning on using the on-board 49.153Mhz XO to act as both MCLK on your board, which will connect to RCK input on Acko's isolation/re-clocker board. I still haven't decided on the 'faster' potato semi chips or the slower NXP or TI chips for re-clocking the i2s. Based on my reading from the Acko isolator/re-clocker GB thread I know that at a minimum, the Amanero isolation will be a benefit. Whether re-clocking in general will be a benefit is what the experimentation is for. From what I've read, it appears that re-clocking will clean up the i2s signals a little bit after isolation, so when it reaches the DAC chip, the chip has to do less to clean up the signal(s). That's the theory at least.

I would love to go the FIFO route (don't know all the ins and outs of it), but at this point I've committed to the isolation/re-clocking and there's no turning back.

So if I'm sending MCLK out from the board I need an 0603 0 ohm R at R2, right? Sorry if I missed this earlier in the thread... What are the un-numbered resistor positions on the bottom of the board, under IC3 and IC4? I recognize the others based on the backwards Rs.
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Old 28th May 2013, 10:39 AM   #115
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Quote:
Originally Posted by Mull3t View Post
Good to know your thoughts on re-clocking.

Board arrived! Thanks a million!

I'm still going to experiment because your board offers the flexibility in doing so. I'm planning on using the on-board 49.153Mhz XO to act as both MCLK on your board, which will connect to RCK input on Acko's isolation/re-clocker board. I still haven't decided on the 'faster' potato semi chips or the slower NXP or TI chips for re-clocking the i2s. Based on my reading from the Acko isolator/re-clocker GB thread I know that at a minimum, the Amanero isolation will be a benefit. Whether re-clocking in general will be a benefit is what the experimentation is for. From what I've read, it appears that re-clocking will clean up the i2s signals a little bit after isolation, so when it reaches the DAC chip, the chip has to do less to clean up the signal(s). That's the theory at least.

I would love to go the FIFO route (don't know all the ins and outs of it), but at this point I've committed to the isolation/re-clocking and there's no turning back.
As mentioned my thoughts are just thoughts and thus I really appreciate your testing!

Quote:
Originally Posted by Mull3t View Post
So if I'm sending MCLK out from the board I need an 0603 0 ohm R at R2, right? Sorry if I missed this earlier in the thread... What are the un-numbered resistor positions on the bottom of the board, under IC3 and IC4? I recognize the others based on the backwards Rs.
In case you want to send out the MCLK signal you should use a 0603 resistor (e.g. 33 ohm) instead of a jumper (0 ohm R) to "damp" the trace impedance.

The unnumbered pads are for alternative bypass Cs if you use LT1761 regs instead of MIC5205 (LT1761 connects BYP and OUT pin while MIC shunts BYP to GND). Next revision will have numbers also on the bottom layer

Best regards, Daniel
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Old 4th June 2013, 05:28 AM   #116
Mull3t is offline Mull3t  United States
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Anyone have access to those pesky matched JFETs? If you do PM me.

@curryman - thanks for the tip on the 33R jumper.

I'm finalizing my build and getting things together for a DigiKey order.

This is my plan:

Amanero -> Acko i2s Isolator (AKL-AMN-S01)-> Curryman 9023 MCLK-> (RCK) Re-clocker (AKL-AMN-S01) -> i2s -> Curryman 9023 w/ JG Buffer

I've decided to forgo the potato flip flops on this one. Overall, I'm pretty excited. Hopefully, I'll be in audirvana within a month.
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Old 4th June 2013, 05:41 AM   #117
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Quote:
Originally Posted by Mull3t View Post
Anyone have access to those pesky matched JFETs? If you do PM me.

@curryman - thanks for the tip on the 33R jumper.

I'm finalizing my build and getting things together for a DigiKey order.

This is my plan:

Amanero -> Acko i2s Isolator (AKL-AMN-S01)-> Curryman 9023 MCLK-> (RCK) Re-clocker (AKL-AMN-S01) -> i2s -> Curryman 9023 w/ JG Buffer

I've decided to forgo the potato flip flops on this one. Overall, I'm pretty excited. Hopefully, I'll be in audirvana within a month.

I will be doing a round of JFET matching for three of Acko's AKD23 w/JG Buffer PCBs that I have here, though I won't be starting on that for a month or two. I've had some back problems so have a DIY project backlog here but can't let go of my sadistic desire to make a matching jig PCB of my own for the full DIY effort.
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Old 4th June 2013, 10:06 AM   #118
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Hi Daniel,

Are there any more PCBs ? I'd like to buy 3 if it is possible ?

Thank you.
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Old 4th June 2013, 11:57 PM   #119
Mull3t is offline Mull3t  United States
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Quote:
Originally Posted by hochopeper View Post
I will be doing a round of JFET matching for three of Acko's AKD23 w/JG Buffer PCBs that I have here, though I won't be starting on that for a month or two. I've had some back problems so have a DIY project backlog here but can't let go of my sadistic desire to make a matching jig PCB of my own for the full DIY effort.
Looks like I have worked out my JFET shortage or at least we're getting there.

I've got most parts selected save my casing and a few other odds and ends.

@Curryman - can I use the DV+ as a jumper for +5v to another board? From the looks of it... it'd work. Otherwise, I'm looking at this... http://www.mouser.com/ProductDetail/...ZWFiuMidRds%3d

Need to find the right jumpers to make it work though.
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Old 5th June 2013, 07:07 AM   #120
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hochopeper, making a matching jig PCB is a really good idea. I used one of my old boards to set up a kind of matching jig. It's really a pain matching hundrets of those tiny bugs.

Mull3t, you could indeed use the DV+ to feed the 5V to other circuits. I'd maybe connect the other circuit directly to the power supply. Anyway you should decouple the other boards using suitable ferrite beads (all the regs on board are filtered).
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