Experience with this DIY DAC ?

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#2,662
Bill Fuss said:
Actually, it's not really a mod. You just pull the 8416 board and plug the I2S in pins 26,27,28,and ground. You only have that one input though. I cut a board down to get rid of everything I didn't need and installed it in an old Philips player. The combo of CDM4, super clock, SAA7210, the DAC board, and the trafos is far surpassing my expectations. It has no shortcomings I can detect, even decaying sounds stay precisely imaged. The dynamics scared my wife, but everything scares her.
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Do you have a picture of this stage?
 
#2,663
gabanyayaya said:
Do you have a picture of this stage?
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Naah, didn't want anybody to see my ugly wiring. 😀

I just cut the entire length of the board between the 12v regs and the 5v regs and cut the entire width leaving the row of pin sockets that I needed to plug the I2S in. I used a whizz wheel on a hand grinder if you know what that is. Gutted the player board of everything after the SAA7210, added a precision clock on a small board, and stuffed the rest in there. Every player would be different. Using one with I2S makes it simple, that is not what's in most players nowadays.
 
#2,667
Bill Fuss said:
Naah, didn't want anybody to see my ugly wiring. 😀

I just cut the entire length of the board between the 12v regs and the 5v regs and cut the entire width leaving the row of pin sockets that I needed to plug the I2S in. I used a whizz wheel on a hand grinder if you know what that is. Gutted the player board of everything after the SAA7210, added a precision clock on a small board, and stuffed the rest in there. Every player would be different. Using one with I2S makes it simple, that is not what's in most players nowadays.
Click to expand...

Ok since there's no picture can you let me know :

1. pin 26, 27,and 28 is referring to CS4398 right ?

2. what is the suitable wire size and length used to connect I2S signal from the source to the DAC? Can I use longer hookup wire to coonect from my CD63?

3. Did you mod the upsampling board to better parts?
 
#2,668
gabanyayaya said:
Ok since there's no picture can you let me know :

1. pin 26, 27,and 28 is referring to CS4398 right ?

2. what is the suitable wire size and length used to connect I2S signal from the source to the DAC? Can I use longer hookup wire to coonect from my CD63?

3. Did you mod the upsampling board to better parts?
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The pins I'm referring to are the socket pins of the 8416 socket.

You will have to add a MCK line if you're not using the 8421.

The wires should be as short as possible. I used 12" when I was experimenting but it was definately improved after I shortened them for the final installation. I used solid core.

No larger than the leads on a RN55 resistor, I'll measure them later and post again.

No mods, what parts would be better?

CD63 probably has 5v I2S output, too hot for the 8421, use voltage dividers. 1k and 1.5k in series to ground and tap off between them. If you have the choice of tapping the 7210 or 7220 I would tap the 7210.

PS Audio posted a buffer circuit for this a couple months ago to use longer runs, requires trans/rec chip at each end. It was pretty simple though.
 
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#2,673
Bill Fuss said:
The pins I'm referring to are the socket pins of the 8416 socket.

You will have to add a MCK line if you're not using the 8421.

The wires should be as short as possible. I used 12" when I was experimenting but it was definately improved after I shortened them for the final installation. I used solid core.

No larger than the leads on a RN55 resistor, I'll measure them later and post again.

No mods, what parts would be better?

CD63 probably has 5v I2S output, too hot for the 8421, use voltage dividers. 1k and 1.5k in series to ground and tap off between them. If you have the choice of tapping the 7210 or 7220 I would tap the 7210.

PS Audio posted a buffer circuit for this a couple months ago to use longer runs, requires trans/rec chip at each end. It was pretty simple though.
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Bill,

From what I understand CD63 use SAA7345, so I2S can be tap at SCLK, WCLK and DATA pins.

So SCKL goes to OSCLK (27), WCLK to OLRCK (28) and DATA to SDOUT (26) at CS8416.....tell me if I'm missing something here?

Regarding MCK line you've said twice, with 8421 no need but without it you have to run from source to 8421...right?

Regarding voltage divider is it really necessary ? Do we need to use it on each pin from the source (SAA7345)? Why I didn't find this in most of CD63 mod tutorial. They just mention tap the I2S without any voltage divider......CD63 I2S MOD

Anyone having a headache here....:headbash:
 
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#2,674
Yeah, me! I can't do your research for you. Have you ever looked at a datasheet or the schematic of the dac board. I enjoy helping people but hand holding I'm not going to do if it stems from lack of research. If there are specific questions I'm always glad to help any way I can.

That's enough ranting, I guess!
 
#2,677
Bill Fuss said:
Yeah, me! I can't do your research for you. Have you ever looked at a datasheet or the schematic of the dac board. I enjoy helping people but hand holding I'm not going to do if it stems from lack of research. If there are specific questions I'm always glad to help any way I can.

That's enough ranting, I guess!
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Relax...you have been helpful....I'm sure what I've found to connect the chip to the dac is correct after some reading. It's just bothers me with the 5v in the i2s lines...none of my reading regarding this mod ever mention about this....more reading and Google!

Ryssen said:
ps audio :last activity 21st June 2009 12:11 PM :0 posts.😉

I will ask about in in the digital section.
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I though 'ps audio' is referring to the brand website...😕
 
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