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Old 15th June 2014, 12:38 AM   #2921
dacen is offline dacen  Norway
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Had to investigate a little to see if I could find out what the other two ICīs that comes after the CXD2510 and before the AKM DAC does. The CXD1815 is just a controller : CD-CONTROLLER ? PSXDEV But the chip that comes thereafter probably explains why so many people like the sound that comes out of the inbuilt DAC. It is a CXD2925. It is a sound processing unit : SPU ? PSXDEV. This is a way of manipulating the sound in the digital domain to make it more pleasing to the human ear. You have to do a translate to get it in English. Taking the signal from the digital output (SPDIF) to a separate DAC bypasses all that and my guess is that the sound will be more natural without this manipulation or cosmetic if you like.

Last edited by dacen; 15th June 2014 at 12:45 AM.
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Old 21st June 2014, 11:05 PM   #2922
bcmbob is offline bcmbob  United States
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This probably should be on the swap meet thread, but just wanted to post that I have several units I bought as a package and never tried to mod. I'm all digital now so don't need them. Don't know if any are usable for this project, but they are selling at the price FREE + shipping.

PM me if interested.

SCPH-5501 @ 2

SCPH-9001

SCPH-7001

SCPH-1001 @ 2 (1 All parts present but disassembled / 1 missing laser head)
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Old 16th July 2014, 12:25 PM   #2923
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Hello guys,
I have modified SCPH-1002 with overload (?) sound. I have no idea what goes wrong with the modification (all done like a Feinste ANALOGE Klangeigenschaften SONY PS1 Playstation 1 SCPH-1002 High End CD Player deutschermanfred.de, including power supply).
Here is audio file with startup sound and modification photos:
https://www.youtube.com/watch?v=gn_L...ature=youtu.be

I have used OPA2134UA and DC2WSIL5/12 (DC/DC converter).
In audio section are 35k Ohm resistors, but on 39k (smd) effect is the same.

My testing platform is Logiteh x-530 (PC speakers) or FiiO with CAL! headphones (better parts is not avaible now).
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Old 21st September 2014, 07:55 AM   #2924
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Hi all, I've just carried out the mick f output stage mods, is it worth changing the op amp as per the deutschersmanfred site?
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Old 21st September 2014, 11:30 AM   #2925
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In short? Yes!
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Old 21st September 2014, 09:28 PM   #2926
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Great stuff, i'll get on it!

Whilst I'm here, how does one adapt a 5 pin power supply for a 1002 motherboard?

This is the only pic of a 5 pin lead on a 1002 motherboard I can find.

Click the image to open in full size.

Also, does the 15v supply from the dc/dc converter solder the the resistor and capacitor above the op amp?

Click the image to open in full size.
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Old 22nd September 2014, 09:50 PM   #2927
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Found the ps pin solution, just that op amp power wire to figure out...
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Old 7th October 2014, 09:21 PM   #2928
Cochise is offline Cochise  Germany
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Default SCPH-1002 with overload

Quote:
Originally Posted by Koveras View Post
Hello guys,
I have modified SCPH-1002 with overload (?) sound. I have no idea what goes wrong with the modification (all done like a Feinste ANALOGE Klangeigenschaften SONY PS1 Playstation 1 SCPH-1002 High End CD Player deutschermanfred.de, including power supply).
Here is audio file with startup sound and modification photos:
https://www.youtube.com/watch?v=gn_L...ature=youtu.be

I have used OPA2134UA and DC2WSIL5/12 (DC/DC converter).
In audio section are 35k Ohm resistors, but on 39k (smd) effect is the same.

My testing platform is Logiteh x-530 (PC speakers) or FiiO with CAL! headphones (better parts is not avaible now).
Hello @Koveras,
where Is the exact plan for this modification?
What happens on pause function when the CD plays (rotates CD, and you push START) and at the amp is of maximum level?
greting @Cochise

www.spektral-audio.de
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Old 9th October 2014, 01:04 AM   #2929
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@ Koverasich ,
have also modified a Playstation 1 SCPH-1000 guidance of deutschermanfred.de. I am very satisfied with the result. Obviously is Manfred the only one who has published a complete guide, and all for free.

Did you do the trace cut before you soldered the OPA2134? Did you measure the voltage at the OPA and DC/DC converter?
If you 're stuck, then write to Manfred an email. He allways gives competent and helpfull answers. Here is his email: info@deutschermanfred.de
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Old 9th October 2014, 09:18 PM   #2930
Cochise is offline Cochise  Germany
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Hello @Pg2005,
the question is "where is the construction plan for @Koveras modification" I did not ask what is on the page yet offered shall, because it does not solve the problem.
On the page "feine analoge Klangeigenschaften" I can not (more) find this plan - why? @Koveras has this modes from there.
So I analyzed according @Koveras film, and I think I know where the problem is. I have explained this up in a German forum two years ago.
>>> What happens on pause function when the CD plays (rotates CD, and you push START) and at the amp is of maximum level? <<<
I think all who have built the get this problem.

! - The opamp (also the BB2134UA) oscillates - !

Look my pictures.
I'm TET-Computerspezials and I do this, the name of the entire modes is

"clean Stereo channel separation "

And what does that have to do with oscillating opamp's? -
very much try it out before you talk bad again over my modes. (!gelle!)
http://spektral-audio.de/14.html
reganrds @Cochise
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Last edited by Cochise; 9th October 2014 at 09:31 PM.
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