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Old 3rd May 2006, 09:17 PM   #951
ttrentt is offline ttrentt  United States
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Quote:
Originally posted by elvenears
What do you all think about disconnecting the power-pins from the DAC
and give him a own PSU ? [/B]

I am thinking about this too. According to the spec sheet it wants 4.5-5.5V, would would be easy to source a simple wall wart for that, but do not know if that would help sonically.
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Old 3rd May 2006, 10:06 PM   #952
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Quote:
I took a quick look at the schematics and at the circuit board, and in this player there doesn't seem to be a seperate D/A converter ( feel free to correct me if I'm wrong). It appears that the large processor does the D/A conversion.
There is a separate DAC on older versions but it's in the DSP in the later ones (The schematic is for the 750x-series version)

Quote:
Anyway, is it posible to set the CD to Replay?...makes life a lot easier!
With a TV, yes.

What else, build yourself a small attachment to the parallel port that controls this. (Getting in complicated things. It would be nice : Be able to put a VFC/LCD, every functions on the remote, etc.)

BTW, the PSX is also a great VCD player with a daughterboard.
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Old 4th May 2006, 06:09 AM   #953
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Quote:
Originally posted by ttrentt



I am thinking about this too. According to the spec sheet it wants 4.5-5.5V, would would be easy to source a simple wall wart for that, but do not know if that would help sonically.

Yes, it might be a good idea - no need for large PSU for the whole PSX - but disconnecting the pins of a SMD IC like our DAC looks like a difficult job. Btw, where can I find a datasheet for the DAC (1002) ?
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Old 4th May 2006, 06:16 AM   #954
jives11 is offline jives11  Europe
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Quote:
Originally posted by bzfcocon



Yes, it might be a good idea - no need for large PSU for the whole PSX - but disconnecting the pins of a SMD IC like our DAC looks like a difficult job. Btw, where can I find a datasheet for the DAC (1002) ?
The two large (relatively) caps above and below the DAC
(see http://feuerbacher.net/DogBreath/PS1...utBoardTop.jpg ) could theoretically be replaced. It is possible to get OSCONS with an SMD form factor. They are listed in the Farnell catalogue and I have seen them used in an old PC DAT drive, they have the distinctive violet coloured markings.

I have not done this, not sure my soldering skills are good enough, but it would seem a good idea ?
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Old 4th May 2006, 06:23 AM   #955
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Being larger SMD parts, capacitors are relatively easy to replace - I have done this, you just need a small soldering iron. I even soldered non-SMD parts instead.

Now that I think, if one wants to disconnect the DAC power supply pins, there is no need to disconnect the pins themselves, but rather try to cut the respective PCB traces and solder wires to them.
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Old 4th May 2006, 07:07 AM   #956
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Default is it posible to set the CD to Replay?...

Quote:
Originally posted by DragonMaster

is it posible to set the CD to Replay?...

With a TV, yes.
Really?..unfortunately I dont have a TV handy but I do have the remote control fitted.
Can anyone tell me which button or combination of buttons it is?

cheers

Lee
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Old 4th May 2006, 08:19 AM   #957
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About dedicated PSU's :

the goal of making a good / dedicated PSU in Music /Highend
equipment is , in my understanding, to simply have a clean
voltage, ripplefree, and to provide a source for current that
is able to deliver minute but very spontaneus changes is
currentflow without vibration in voltage. Thats why we have a
armada of Caps and other stuff.

But what is allways easily forgot is that the ultimate PSU is and
allways was a "Battery", becus it knows nothing else as DC, plain and simple.

Batteries are quite unpractical, but thats not to say that if one is
dedicated enough that he cant use a Truckbattery 100AH+
and some ML3xx or staff behind it.

The PSU for the DAC can be a smalone, but it better has a very
clean voltage becuse its THE stage where the 1001011101's
are witchcraftet to anlogue signals
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Old 4th May 2006, 08:29 AM   #958
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Well, the DAC should not consume very much power, so I guess a rather small battery could easily do the job. Even better if one removes muting caps and opamp !
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Old 4th May 2006, 08:42 AM   #959
Mick_F is offline Mick_F  Germany
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Well, a battery indeed delivers perfect DC but that is not the only decisive parameter. One also has to make sure that that the rate at which the required current is provided is very high!

Mick
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Old 4th May 2006, 08:49 AM   #960
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Mick, but we're talking about a poor DAC here, how much current could it need ? (of course this would also depend on the load, i.e., the impedance of the following stage)
Wouldn't a reasonably large (and fast !) capacitor on the source(battery) do the job ?
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