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Old 17th August 2011, 07:02 AM   #21
Coris is offline Coris  Norway
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Regarding my previous post about BDP95 modifications.
For those DIYs who want to try this or something else. This forum is first an DIY forum, right?
I do hope you read this before open en touch the inside components of the player.

KEEP both the player and your self in a 0 volt environment. This mean that the player chassis and your self have to be connected to earth/ground all the time you working on this. It is the best to have an ESD mate on that table you use, and keep the PCB boards only on that ESD surface. Take all the ESD percussions before proceed to any work with the boards or electronics components. Else irreversibly damages can occur...
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Old 20th August 2011, 07:29 AM   #22
akltam is offline akltam  Hong Kong
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Hi,

It is interesting to see how you tweak your OPPO 95. I suggest you can reference Twisted Pear Audio on their buffalo Dac. There are many discussion there how to squeeze every bit of performance of the 9018 Sabre DAC. According to them, the power supply is the key to excellent performance to this DAC. They do use 80MHz crystal.

If they use the 15+- supply for the op-amp to feed the regulators to the digital section, it will not be best setup. If there is another regulators for the op-amp, it will be different stories.

Anyway, do let us know how it gets on.
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Old 20th August 2011, 10:41 AM   #23
Coris is offline Coris  Norway
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Quote:
Originally Posted by akltam View Post
Hi,

It is interesting to see how you tweak your OPPO 95. I suggest you can reference Twisted Pear Audio on their buffalo Dac. There are many discussion there how to squeeze every bit of performance of the 9018 Sabre DAC. According to them, the power supply is the key to excellent performance to this DAC. They do use 80MHz crystal.

If they use the 15+- supply for the op-amp to feed the regulators to the digital section, it will not be best setup. If there is another regulators for the op-amp, it will be different stories.

Anyway, do let us know how it gets on.


I have been now for a while in to the Sabre DAC world including Buffalo DAC. I`m just waiting very exited to get now my Buffalo III. That because I knew about hi frequencies clock this hi end DAC is capable. That because I`ve chosen to buy Oppo BDP95, as is use this exceptional DAC chips. As I wrote before in this thread, I was very disappointed to see how Oppo has designed the audio stage of this player, and specially how they use a very wrong designed analogue power supply for this their (wanted) ultimate player. This was the main reason for I`ve tried to fix out what I think is wrong about this BDP95 player. I have now a quite long list of the necessary modifications for have the most possible from this Oppo player. I have contacted Oppo for give them the message that is something quite wrong with the design of some parts of their player, specially about that analogue power supply. Unfortunately they react quite arrogant in their feedback. They still think that this last player is the best in the marked. It could be, but in the same time it looks like they do not understand yet that the hardware put it in to this player can much more using the right design, components, and so on...
I have to say that in my opinion is quite a mess in using power supplies in the audio board, as about power distribution on this board too... Only an example: the main clock oscillator for ESS9018 is feed it directly from the analogue power point (3,3v) of the output stage of ESS9018... Not even a ferrite bead between that oscillator and the power point they used...
Anyway, with the modifications in place, the player sounds exceptional, and the picture is much better in gradients and details using a better dimensioned heat sink for the main processor.
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Last edited by Coris; 20th August 2011 at 10:50 AM.
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Old 21st August 2011, 07:01 AM   #24
akltam is offline akltam  Hong Kong
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It will be a shame that the crystal is sharing the same power supply of the analog section. I notice that Buffalo II has separate regulators (in their bare form) for the crystal.

If you have time, can you make a list of tweaks you make to this player. (and the level of difficulties of each of these tweaks). As I don't have good enough eyes for SMD components.
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Last edited by akltam; 21st August 2011 at 07:03 AM.
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Old 21st August 2011, 06:51 PM   #25
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I am SURE that the crystal doesn't share the power with analog section of the DAC.
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Old 21st August 2011, 09:20 PM   #26
Coris is offline Coris  Norway
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Quote:
Originally Posted by SoNic_real_one View Post
I am SURE that the crystal doesn't share the power with analog section of the DAC.
You may not be so sure... Just open your BDP95 (we talk about BDP95, right?), take out the audio board, and follow the trace of the 54Mhz crystal power (3,3v). It is tapped from AVCC-R of ESS9018, his bypass capacitor, on the left hand side of the (stereo stage) DAC. Not even a ferrite bead between that point and the crystal power... This was not enough bead for that designer. He chosen to inject the oscillator output in to an resistor divider before it get in to the ESS9018. This divider is placed between 3,3v rail and GND... Not ferrite bead her either... One do not have to be very specialist to figure out that a part of that 54 Mhz clock goes directly in to the 3,3v rail...
I had to take the risk to remove that divider placed on the XI clock input of the DAC. I`ve used an dedicated regulator (ultra low noise, broad band) for that new crystal (80Mhz) and place it right near DAC chip. One can even hear the result....
For not say more about the voltage reference used in the op amp I/V (stereo, as multichannel) stage... Is taped too from the standard 3,3v power rail. A resistor divider and a filter (electrolytic) 220 capacitor for that op amp reference level... That`s all!
I`ve used here also a high precision, ultra low noise voltage reference chip, dedicated to this function... And I could even set up to the nearest 0 volt as possible the offset of the final stage.... Again, one can hear (very) well the difference...
And so on...

Last edited by Coris; 21st August 2011 at 09:45 PM.
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Old 21st August 2011, 09:38 PM   #27
Coris is offline Coris  Norway
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Quote:
Originally Posted by akltam View Post
It will be a shame that the crystal is sharing the same power supply of the analog section. I notice that Buffalo II has separate regulators (in their bare form) for the crystal.

If you have time, can you make a list of tweaks you make to this player. (and the level of difficulties of each of these tweaks). As I don't have good enough eyes for SMD components.
Hi
Of course I can list all those tweaks and fixes, but this involve a quite extended work. In one way I`m not finish yet with the modifications. In other way, I just still think about the fact of making public all those modifications which upgrade quite substantial this player... It could be like a quite big effort, investment and work is offered for free to the Oppo company, for that they correct, upgrade and sell in the future a better product. I just think that this is not quite fair or right...

Else in those modifications is just about SMD components, enough high skills in soldering, and about not quite cheap tools involved... So, very easy is definitively not...
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Old 21st August 2011, 11:15 PM   #28
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Tell you the truth I don't own a BDP95, I opened one for other upgrade, did not check all the traces.
The "old" BDP83SE was build better (see below), nothing like that. I am still not sure that you have the right path, maybe it goes to the digital 3.3V?
Or they "outsourced" the latest designs to China too?

Click the image to open in full size.
Click the image to open in full size.
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Old 22nd August 2011, 06:51 AM   #29
akltam is offline akltam  Hong Kong
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Quote:
Originally Posted by Coris View Post
Hi
In other way, I just still think about the fact of making public all those modifications which upgrade quite substantial this player... It could be like a quite big effort, investment and work is offered for free to the Oppo company, for that they correct, upgrade and sell in the future a better product. I just think that this is not quite fair or right...
Do you honestly think they don't know what you know ? When you have to bring in cost, margin, profit, marketing ... etc. and all other factors outside the DIY arena ...
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Old 22nd August 2011, 01:27 PM   #30
Coris is offline Coris  Norway
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Quote:
Originally Posted by SoNic_real_one View Post
Tell you the truth I don't own a BDP95, I opened one for other upgrade, did not check all the traces.
The "old" BDP83SE was build better (see below), nothing like that. I am still not sure that you have the right path, maybe it goes to the digital 3.3V?
Or they "outsourced" the latest designs to China too?

Click the image to open in full size.
Click the image to open in full size.
Yes... It seems that we talk about different things... Is hard for you to understand what I mean when you have an old model of this player to refer to... and is hopeless for me to explain something when I know almost nothing about that model you own...
Anyway I know well what I`m saying concerning this last Oppo player BDP95. It is very possible that the model you own, haven`t those problems which I`ve found in this BDP95... This your audio board looks like more compact, but I do not know details about.

Last edited by Coris; 22nd August 2011 at 01:40 PM.
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