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Old 28th June 2011, 01:14 PM   #231
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Quote:
Originally Posted by georgebrooke View Post
Do you have a gut-feel of which changes gave the most benefit?
If you have AK4396 version I consider mandatory the replacement of caps and resistors as per datasheet.

Regarding impovements the most important, in order are: LPF caps, Opamp, Opamp decoupling, DAC decoupling, LPF carbon resistors, CS8416 decoupling.

Beware that the spreadsheet was a 'proposal' subject to change as experiments are going on.

In the next days I'll post an updated one.
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Old 28th June 2011, 01:25 PM   #232
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Quote:
Originally Posted by georgebrooke View Post
Hi,

One column that would be nice to add to the spreadsheet would be something that gives an idea of how useful / significant you felt the particular upgrade to be.
That would be most useful.
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Old 28th June 2011, 02:16 PM   #233
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Default Oscons , KP1830's , PPS and Silmic

Quote:
Originally Posted by georgebrooke View Post
Hi,

I was slightly tongue-in-cheek with my comments, but I think there can be nasty surprises when we are not completely sure of the various pcb versions around.
I am hoping to incorporate most, if not all, of the upgrades that you have listed in the spreadsheet.. specifically with the 4396 chip (with the appropriate filtering). I also want to try a direct feed from the output pins of the chip itself ... as I have done on some other AKM devices, with some success.
One column that would be nice to add to the spreadsheet would be something that gives an idea of how useful / significant you felt the particular upgrade to be. It is hard to have a priority of implementation. Do you have a gut-feel of which changes gave the most benefit?
Oscons around the DAC/receiver and if you can get them KP1830's on the filters
PPS film (again if you can get them) bypassing on the digital electrolytic's and those massive power filter caps Erin used did get it kicking along especially the one on the digital line , some Silmics on the analogue lines preferably at the opamps but the do not fit very nicely there .

You just have to do more research on your capacitor selection so you know what is applicable where .

I would say the Silmics on the opamp make a nice upgrade to the sound
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Old 28th June 2011, 03:40 PM   #234
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Default Spreadsheet

Quote:
Originally Posted by ClaveFremen View Post
If you have AK4396 version I consider mandatory the replacement of caps and resistors as per datasheet.

Regarding impovements the most important, in order are: LPF caps, Opamp, Opamp decoupling, DAC decoupling, LPF carbon resistors, CS8416 decoupling.

Beware that the spreadsheet was a 'proposal' subject to change as experiments are going on.

In the next days I'll post an updated one.
Hi,

One of the advantages of the delay in getting goods from China is that you get a chance to reflect on your plans. In this case I shall do NOTHING until I see the new spreadsheet (for which, many thanks) and I have taken on board the various opinions on priorities of update.
This will be very interesting project as I also have in my computer an X- Meridian 7.1 sound card. This board has 4 AKM4396 chips on it and user-selectable, socketed, opamps following, so I should get some interesting A-B comparison opportunities.
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Old 28th June 2011, 05:24 PM   #235
YohY is offline YohY  United Kingdom
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Lightbulb RE: 3 types of pcb ???

Ok, I propose (just to rule out variations) that we compile some pics of the boards we've received.
I'll start here by uploading pics of the pcbs I've acquired...

2011-06-28 17.27.07.jpg

2011-06-28 17.36.00.jpg

I noticed on Clave's last attached picture that there's no 'ES' marking in the bottom right corner by the 'Mini 24 96' markings

My boards arrived populated, so I cannot see/confirm if there's any track route differences.

Another thought : I wonder if Evanellion can comment on these variationa as he/she said earlier in this thread that they developed the board design !?!

-Andy-
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Old 28th June 2011, 07:15 PM   #236
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Default PCB Ids

Hi,

well that's a useful initiative. As soon as my board arrives I shall do my best to publish its version to the forum etc.
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Old 28th June 2011, 07:51 PM   #237
YohY is offline YohY  United Kingdom
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Default AK 4395 IC/5v reg/Oscon mods

Well, I can say that after all this work, the new modifications to the
AKM kit board is completed... up an runnin' and as I type - burning in ! (Big sigh of releif)

Here's how it looks...

2011-06-28 20.22.05.jpg

For a moment there, before power-up, I was thinking that the chip could be a fake as the labelling isn't the same as the original AK4396 ic..
..but all appears to be working well

2011-06-28 20.39.54.jpg

{This pic shows the extra voltage regulator used to dial-in the 5v required by the 4395 i.c}

I'll run this in for the next 4-5 days then give it a spin thru the stax headphones. Hopefully, it'll be a blissfull experience

-Andy-

Last edited by YohY; 28th June 2011 at 07:58 PM.
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Old 28th June 2011, 11:16 PM   #238
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Default I am a little in advance...

Well, I've attached an updated BOM which reflects what I've actually done and some of the planned mods and also some photos.

It includes preliminary subjective listening impressions and like the previous one it's a work in progress.

Listening impressions of mods are compared to my original assembled kit (photo attached)

The most important mods are the one regarding the LPF (Caps, resistors, opamp, opamp decoupling)

Digital chips decoupling comes immediately after.

As Jean-Paul pointed out the 7812 needs an heatsink.

Apart opamp decoupling caps all electrolythics I've used are a perfect fit. Some Wimas though must be mounted on the other side of the PCB.

In the last photo opamp decoupling caps are removed just for better visibility of others mods
Attached Images
File Type: jpg IMG060 800.jpg (92.7 KB, 1409 views)
File Type: jpg IMG083.jpg (86.4 KB, 1538 views)
File Type: jpg IMG084.jpg (89.0 KB, 1377 views)
File Type: jpg IMG088.jpg (130.0 KB, 1472 views)
Attached Files
File Type: pdf BOM 0.8.pdf (9.9 KB, 413 views)
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Last edited by ClaveFremen; 28th June 2011 at 11:25 PM.
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Old 29th June 2011, 06:56 AM   #239
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Default BOM

Hi Cleve,

that new BOM looks really useful... and the photos help a lot too. And Chrome has started to work properly! Must be a good omen. I am looking forward impatiently to the arrival of my board.

Once again, thanks for the time and effort that you have put into this

Georgevb
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Old 29th June 2011, 07:14 AM   #240
YohY is offline YohY  United Kingdom
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Clave -

Nice work on the BOM !

According to Sendler who's had some experience with the various AKM chips, he rates the 4395 to be the best.

My board now has this..

-Andy-
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