I would like to announce (not this thread subject, but some 95 owners read this thread too) that I have now ready the approach for an external serial PSU for 95 model. Mainly the idea is to place the serial PSU into a nice, black anodized enclosure, the same high and depth as the player enclosure, beside the device(on its right hand side). This it will minimise the connection cable length.
The original toroid it will be placed too, into the external PSU. This movement is meant to be done by the user (dismounted from its original place, and screwed in into the desalinated place and connected its cables into the provided connectors).
The connection between the external PSU and the player is made by flat cable in a special designed approach, placed under the player`s enclosure. The user need only to solder in some wires into an provided PCB adaptor. More details it will be available at the right time.
I would like to know how much interest it may be for such optional/analogue power system for 95 model. If enough interest, then I will proceed to design and produce the system, based on my recent finalized LPM for 105/105D models.
The original toroid it will be placed too, into the external PSU. This movement is meant to be done by the user (dismounted from its original place, and screwed in into the desalinated place and connected its cables into the provided connectors).
The connection between the external PSU and the player is made by flat cable in a special designed approach, placed under the player`s enclosure. The user need only to solder in some wires into an provided PCB adaptor. More details it will be available at the right time.
I would like to know how much interest it may be for such optional/analogue power system for 95 model. If enough interest, then I will proceed to design and produce the system, based on my recent finalized LPM for 105/105D models.
Are you doing this simply so you can have a product that works with both 95 & 105? If so, don't do it. Who cares about the 95, its an old product and potential interest as a percentage across 95 & 105 combined, will be much smaller than the 105.
Best to focus on what works best for the 105, which is where all the main (real world, not just on DIY audio) interest will come from.
Best to focus on what works best for the 105, which is where all the main (real world, not just on DIY audio) interest will come from.
Well, there is not just simple the approach of an external PSU for 95 model. There is not possible to have the same product working for both models. There is no any clue to have an external PSU for 105 model, as it is enough space inside for both the serial PSU and its ventilation system. It is not the case of 95 model, which is quite compact, and it suffer already of an high heat dissipation from the processor, and due to some imperfections of the original analogue power system. For 95 model only an external PSU it may be the solution (in my opinion).
I only agree that is not a big deal to focus on such improvement for 95 models...
The LPM for 105/105D models is now finished as design/testing/corrections. It is only ongoing the production process. Unfortunately this it goes quite slowly, especially when about the customized transformers. I expect to have quite soon (already next week) all the necessary parts, so few LPMs it will be first available. Then, few weeks later, a larger batch of LPMs it will be finished.
I only agree that is not a big deal to focus on such improvement for 95 models...
The LPM for 105/105D models is now finished as design/testing/corrections. It is only ongoing the production process. Unfortunately this it goes quite slowly, especially when about the customized transformers. I expect to have quite soon (already next week) all the necessary parts, so few LPMs it will be first available. Then, few weeks later, a larger batch of LPMs it will be finished.
Hi
For the ultimate OPPO 105 mod, there is reference .
See the picture below. It is made in France, selling in Korea with over 10000$ price tag.
For the ultimate OPPO 105 mod, there is reference .
See the picture below. It is made in France, selling in Korea with over 10000$ price tag.
An externally hosted image should be here but it was not working when we last tested it.
Yeah, maybe is not so difficult to misunderstand one or another of my posts...
For 105/105D models the LPM is internal, as showed here (adjusting fan power control included).
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Why do you say that? Why is it a monstrosity? What have they done wrong so obviously that you can judge that from a picture?
Sorry, it was meant to be a light-hearted remark and not for analytical introspection.
But I do feel that if given an opportunity, the Oppo 105 I have here, if the chance was given, I would love to have a comparison.
For example, I was able to borrow the very latest "Pikes OS" version of the DirectStream DAC from a friend who is a dealer. It seems a real favourite with reviewers right now and has graced quite a few full colour front pages of HiFi magazines around the place. So I had that as a very good benchmark against the Oppo 105 I have here and invited some friends around. We set them both up precisely with a dBSPL meter, so the volume would not favour one over the other. Which was better? Let me just say that the listeners wanted the Oppo.
So, I would happily conduct comparisons with any other upgraded Oppos out there - no fear whatsoever and let the chips fall wherever they may.
I have a multi-millionaire client using our Oppo 105 as the central source in his system, and we are talking huge money here, where the cables alone are hugely more expensive than the upgraded Oppo, and he loves it and others who hear his system know it musters at the highest level.
So, I feel after near 5 years of work getting the best out of the Oppo 95 and Oppo 105, I am very confident and fear no comparisons.
And I think I should also point out that some of the things I have done I have also shared a large part of it here (not quite everything), as Coris will tell you.
Cheers, Joe
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"I do have a fully balanced version of the above - two SOIC/OPA-860s required per channel and more symmetrical (has to be) than the above single-ended..."
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Hi Joe, possible that you could show us this schematic, and would it bring out better sonic performance? Thanks!
I am not sure exactly what you want, but I did post this earlier and will repeat here:
You could of course use OPA861 and a separate buffer. The one used in the OPA860 is a current feedback opamp - and hence recall John Curl saying that the OPA861 is an inferior replacement for OPA660, where the buffer part had zero feedback. So to replicate that, use OPA861 and choose an add-on zero feedback buffer.
Now if I was to understand you correctly, can you double up on the above circuitry and go balanced input and output? Was that the question? The answer is yes.
Cheers, Joe
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Member
Joined 2006
The quote was actually from you earlier on in the thread, sorry I didn't make it clear.
See #647
http://www.diyaudio.com/forums/digi...o-s-bdp105-discussions-upgrading-mods-65.html
Would you happen to have the balanced circuit drawn? Or it is simply as a double up of the circuit shown as you said?
Thank you so much again!
See #647
http://www.diyaudio.com/forums/digi...o-s-bdp105-discussions-upgrading-mods-65.html
Would you happen to have the balanced circuit drawn? Or it is simply as a double up of the circuit shown as you said?
Thank you so much again!
Member
Joined 2006
Hi David
Good to see you here.
To try answer your question, I would still go for the Oppo 105. It does have a problem with the maximum phases you can put together and in that respect I do prefer the '95. In the '105 you can only put together manually two phases (in the '95 all four are already summed/wired together) and you miss out on the two phases that goes to the headphone circuit that turns off the other stereo phases when you insert headphone plug (Oppo could fix easily this by giving us the option in the Settings via Firmware upgrade). But to counter that, there are signs that the ES9018 is more carefully implemented on the '105, a lot more thought has gone into cleaner inserting of clock signal for both stereo and multi-channel, and improved power supply to the DAC. We don't know exactly what Oppo has done to the programming potential of the Sabre DAC, but that side would likely have seen more tweaking on the '105. So there are pluses and minuses and maybe they cancel each other out?
I would still recommend the '105 over the '95 overall. The added features, the ability to use it as a preamp for multiple digital sources (some people have zero analog components in their system, shock horror, and doesn't need analog inputs). From the installer's point of view, give me the '105 any time.
Any chance you coming up to Sydney some time, would love to meet up here. Your interest in speakers and so on, I suspect it could interesting. Come listen to JLTi Oppo Level 4 and why we now have six installers world-wide doing them and the feedback is pretty heady.
Cheers, Joe
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All I know that it can be done and indeed I have used that topology as a balanced microphone preamp and I passed that circuit on to the late Allen Wright who in turn used it for Burr-Brown DAC used in the Sony XSA-5400ES Vaccum State balanced upgrade. Alas I don't have the schematic and it I don't have the right to show it anyway.
As I recall, the the two "-" are connected together and not grounded, they are tied together with a low value resistor, at least 10R (or it can lead to instability), this is the key for balanced operation from the input onward. Then the gain resistors to ground as per usual, two of them, one per OTA. Use 3R3 resistors to ground on the two "+" inputs - connect the ES9018 to that point.
Then as the final touch, add a 1uF across the 3R3 resistors where they connect to "+" input - this will implement the controversial "Rasmussen Effect" - once tried you want go back and it is easy to insert and take out and hear the difference that Ken Newton said was "not subtle."
Does the above make sense? Are you up to it?
Cheers, Joe
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Member
Joined 2006
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For example, I was able to borrow the very latest "Pikes OS" version of the DirectStream DAC from a friend who is a dealer. It seems a real favourite with reviewers right now and has graced quite a few full colour front pages of HiFi magazines around the place. So I had that as a very good benchmark against the Oppo 105 I have here and invited some friends around. We set them both up precisely with a dBSPL meter, so the volume would not favour one over the other. Which was better? Let me just say that the listeners wanted the Oppo.
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Cheers, Joe
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Joe:
Was the preferred Oppo stock or one of your modded versions?
I too read with curiosity the virtues of the DSD dac with its Pikes Peak OS and previous version. I looked at its bench test measurements and the reviewer was puzzled by the very high distortion levels it portrayed, so much so that he sent the sample review to the manufacturer for comment. The manufacturer also agreed and issued a another firmware patch that supposedly cured the distortion problem. Subsequent tests on the dac with the new firmware(Pikes Peak OS) revealed a reduction in distortion by about 10dB but it was still high. The distortion profile looked like one from a tube amplifier with plenty of even ordered harmonics which are known to provide a euphonic sound to the listener.
I believe the even harmonics were due to the output transformers used in the dac to provide galvanic isolation and also act as passive filters to the up-converted(10X to 28.2 MHz) then down converted(5X to 5.6MHz) DSD audio stream.