Playstation 1 as CD transport (SPDIF output) - Page 2 - diyAudio
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Old 14th August 2013, 09:43 PM   #11
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Join Date: Jul 2011
looks like them went the long route to get the digital out of tapping the Eiaj signal at the DAC then convert it to SPDIF?
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Old 14th August 2013, 11:24 PM   #12
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I think the DIT4096 solution offers more scope for interfacing non-100x PSX's (and other consoles it seems)? Your solution is tailored for the 100x Playstation, so the alternative seems like overkill. (I didn't build a PSX transport, opting for Mick Feuerbacher's audio section mods instead). Are you considering installing a low jitter clock in your PSX? I'm not sure if it's practical but the DIT4096 datasheet indicates it needs MCLK (from the AKM DAC?) to work, so maybe there a improvements to be made here.
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Old 15th August 2013, 03:56 AM   #13
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No plan on installing clock and such. My original intent was to find the I2S, and since I found the SPDIF instead I might add a CS8414 right next to the CXD2510Q and turn spdif into I2S and use the three RCA jacks in the back to send I2S signal out.

The reason of wanting to use I2S is that the signal frequency there is lower therefore has lower requirement on signal cabling. Also I don't think I2S has a minimum cable length requirement.

I think I have done everything I can, in modding the internal DAC section and the result is still not quite that great. The sound is smooth but not detailed enough for critical listening (smoother than my x555ES but not as detailed), I think the problem is with the AKM chip, there is not much to be done there.
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Old 16th August 2013, 01:16 AM   #14
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Location: Bendigo
Great work!
I was wondering if it is possible to add a digital input to the playstation. I say input as I think it would be great to be able to use an external transport (shigaclone) but still use the amazing dac in the playstation.
Thank you in advance
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Old 16th August 2013, 05:29 AM   #15
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Not sure if it is worth the trouble using the PS1 board as a DAC. The chip itself has limited resolution, it seems. I would guess people like its sound because of the smoothness (the top end rolls off a bit so there is more or less no bit in the sound)

I think the bottle neck in the PS1 is the DAC chip, the transport section might have some potential.
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Old 23rd October 2013, 11:14 PM   #16
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ah interesting ps1 mod .. i do some mick mods and happy , here is another mods .. i want to try it ... but looking ps1 spch 1001 is hard right now....

might the diy force be with you
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Old 11th May 2014, 02:55 AM   #17
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Location: Bendigo
I can believe this thread has not been more popular!
I have modded my ps1 the same as Mick Feuerbacher. Great improvement might i say.
If i was to perform this digital out mod would it be able to be constantly on? as in would i have to have a switch so that the +v that activates the chip can be switched off when im using the internal dac part of the PlayStation in place of a external dac?
Thanks in advance
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Old 16th May 2014, 10:34 PM   #18
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there is not interference between the SPDIF-out and the rest of the circuit. you simply gain the digital signal output, and lose nothing.

However..... the SPDIF-out doesn't have the mute function, it reports whatever signal the processor is sending out, ie. when you first install the CD and close the lid, there will be high pitch searching noise; if the playstation is on but not playing for a while (say, the CD ended and you didn't change CD or power down the station), the SPDIF will send out some kind of white noise signal. quite loud, scared me the first time .

I would recommand doing the mod to see how you like the sound quality of SPDIF out, I think it is quite good.

You can also tap the EIAJ signals from the processor and install a TDA1545A (NOS Dac chip) to replace the stock AK chip. Then you can use fancy resistors to do I/V for the 1545 output. I much prefer the TDA1545 to the stock AK chip, the NOS 1545 doesn't sound as resolved at first, but after a while it is hard to go back to the stock AK chip.

For some reason I just could not get the TDA1543A (the EIAJ version of TDA1543) to work in a ps-1001.
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Old 17th September 2014, 06:12 AM   #19
mfgroup is offline mfgroup  Ukraine
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Join Date: Sep 2014
Hello all. I am tweak my ps1 for spdif and all works well.
BUT.. a have a some minor issue with sound.
More middle range, very light hight and low range. like from 500hz to 12khz 0db and 20-500hz and 12khz-20khz to -3-6db.
I think is all because output impendance of spdif not conformed.
I seen very similar issue (on analog) when input output impendace was wrong (like on input 47kohm device, but on 100kohm all been fine).

Can you explain why you use 300ohm and 100ohm in spdif output. Maybe for (R1xR2/)R1+R2=100x300/100+300=75Ohm standard digital output? )))
I think that output impendance been more greater or smaller then 75ohm what is a problem.

Maybe input impendance of my DAC are not standard.

Please explain why you use 100 and 300 ohm in this build, and how i can change nominals resistors to conform my dac impendance.

Last edited by mfgroup; 17th September 2014 at 06:28 AM.
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Old 4th November 2014, 06:32 AM   #20
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Hey mfgroup i am going to bump this as i too am interested in your question.
Hopefully audiocats see's this
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