Oppo`s BDP105 - discussions, upgrading, mods... - Page 96 - diyAudio
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Old 4th June 2014, 07:30 PM   #951
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Thanks Coris and eganz1...
I really enjoy doing this stuff... maybe I have a problem..

The Oppo is was bought to replace a dying heavily modded Sony scd77es ... in my audio system. I also wanted to be able to stream from a synology Nas... all works beautifully.

This feeds into a BAT vk50es then Parasound JC 1s and finally out of ProAc d38s speakers.
Interconnect s and cables are Purenote.

Appart from the Oppo, all of the other units are fully stock.

Any thoughts on the Panasonic FRs?

... . sent from an oasis in the wilderness. ... ..
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Old 4th June 2014, 07:30 PM   #952
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Eganz1. The coupling caps are already out.

... . sent from an oasis in the wilderness. ... ..
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Old 4th June 2014, 08:40 PM   #953
Coris is offline Coris  Norway
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Quote:
Originally Posted by PhopsonNY View Post
Thanks Coris and eganz1...
I really enjoy doing this stuff... maybe I have a problem..
You are not the only one (heaving a problem)...

Last edited by Coris; 4th June 2014 at 08:43 PM.
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Old 8th June 2014, 08:26 PM   #954
Coris is offline Coris  Norway
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My clock divider is now up and running.

216Mhz SAW main clock, divided to 108Mhz for DAC and to 27Mhz for processor.
Here is the test bench, but finally this kit it will look better, with shorter connection pins, and soldered on the main battery board.
It need a little bit more fine tuning, but how is now it looks like in the attached scope pics.
Quite excited to "hear" the result...
Attached Images
File Type: jpg clock divider.jpg (422.3 KB, 237 views)
File Type: jpg clock 216Mhz.jpg (164.2 KB, 225 views)
File Type: jpg clock 108Mhz.jpg (165.5 KB, 222 views)
File Type: jpg clock 27Mhz.jpg (150.5 KB, 222 views)
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Old 9th June 2014, 05:29 PM   #955
Coris is offline Coris  Norway
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Improved 108Mhz clock signal, after some adjustments of divider circuits.
It will be for sure a second version of the divider PCB, as I found necessary with some other design improvements...
Attached Images
File Type: jpg improved clock signal - 108Mhz.jpg (226.7 KB, 206 views)

Last edited by Coris; 9th June 2014 at 05:34 PM.
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Old 10th June 2014, 04:47 PM   #956
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Looks like it is all coming along nicely.

Have so far removed ac coupling caps and grounding output resistors... replaced smoothing caps at buffer/amplifier/mix op amps with silmic iis and post dac smoothing caps with panasonic fcs... also replaced audio board diodes with schlottky types.

Still burning in but sounds better... more integrated full sound... fuller and more precise bass... maybe a slight loss in absolute resolution especially leading edge of musical phrases... but will see after full burn in.
Next is for pre dac filtering improvement.

... . sent from an oasis in the wilderness. ... ..
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Old 18th June 2014, 03:56 PM   #957
Coris is offline Coris  Norway
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After some more tests, I have found out that the clock signals it can be improved further, at the divider chip input as at its output. So, I have decided to produce another improved version of the divider PCB.
I do hope I will get it soon, and then having the opportunity to publish better test results.
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Old 19th June 2014, 01:59 PM   #958
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Default Capacitor

Hello,

I'm beginning to tweak OPPO's 105D.
What do you think about changing capacitor SMD 220µ on the motherboard by bigger one as 470µ SEPC (OScon)
I speak about capacitor near the DC-DC converter.

Thx.
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Old 20th June 2014, 07:21 AM   #959
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Coris,
what is your feeling about TCXO and better OCXO ?
Do you believe that your Clock with divider should be better for a lower price ?
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Old 20th June 2014, 09:42 AM   #960
Coris is offline Coris  Norway
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To avoid some confusions for the new members here, about the clock mod in 105/105D models, I think to publish again this picture with the DAC oscillator details.
Attached Images
File Type: jpg DAC clock BP105-105D.jpg (686.3 KB, 62 views)

Last edited by Coris; 20th June 2014 at 09:56 AM.
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