Pics: CD-PRO2 PSU & TDA1543 DAC

[stefanobilliani]

Single Dac circuit

Rarkov ,

the schematic you link at is uncorrect IMHO:

the 47k resistor must be connected at the signal output after the caps and at ground , while in the picture they are connected at ground and at the ground of the output pin

I also use filter the high freq with a cap across the 1k I/V resistor : my first set is 2.2n but I suspect that I will prefear a 12db/oct slope; more listening will tell me what to do .

 

[jleaman]

What is that schematic for ?

 

[stefanobilliani]

It is a D/A converter ,the TDA1543, that accept I2S signals format at the input (at the left) ;
It is complete of a passive I/V converter (pin 6,8) output stage , and a resistor ,1K at pin7 ,for a voltage reference that is essential for the DAC circuit.

 

[Rarkov]

stefanobilliani:
I will try and look into your points about the schematic. I hope they're correct, but easy to fix if not! Thankfully! 😉
I haven't been able to run the DAC yet (as it solely accepts I2S) but when I ordered the CD-PRO2 uint - the bloke said that the onboard DAC is excellent...so it's just a case of trying them I think.


I've just checked the datasheet and nothing was mentioned about output stages...I'll ask Peter Daniel...

Thanks,
Gaz

 

[Peter Daniel]

Re: Single Dac circuit

Rarkov ,

the schematic you link at is uncorrect IMHO:

the 47k resistor must be connected at the signal output after the caps and at ground , while in the picture they are connected at ground and at the ground of the output pin

I also use filter the high freq with a cap across the 1k I/V resistor : my first set is 2.2n but I suspect that I will prefear a 12db/oct slope; more listening will tell me what to do .

Yes, the 47k resistors are connected on a schematic between 2 grounds, which doesn't make sense. They have to go from output to ground as mentioned in a post. They are only there to discharge the caps and I'm not using them at all. You may expect a thump in a speakers when powering on and off, but my DAC is always on so I don't worry about it. In the Kusunoki schematic, there were some caps across 1k resistors (3.3n), but I decided not to use them. The DAC works fine without them and sounds great. I'm using Rikens for I/V resistors and 3.3 u MIT RTX for coupling caps. Reclocking brought big improvement and better PS is also important . This is my currently best DAC, it's better than anything I tried with oversampling and it's also better than TDA1541 in my Marantz CD-94 (non oversampling and partly modified). It may be not the first word in dynamic, but I trade it for resolution and ambience I got with passive output stage. Here's the link to some pics: http://www.diyaudio.com/forums/showthread.php?s=&postid=175127#post175127

 

[Rarkov]

Just to clarify...Are these the changes I need to make?
Thanks,
Gaz

 

[Peter Daniel]

Yes, I will also change my schematic.

 

[Rarkov]

This points out the bad points about PCBs!!!
Oh well...Shouldn't be too difficult to change.

Just a couple of questions...

Does reclocking refer to reclocking the circuit board on the actual CD-PRO2 unit?

What defines the NON-OS or 4x OS in this circuit (or anywhere for that matter!?)

Sorry - I'm sure they're simple questions - just ones that I've never needed the answer to yet.

Thanks,
Gaz

 

[fedde]

If you add a digital filter chip it will be 4x oversampling, otherwise non-os. Peter ment asynchronous reclocking. This is reclocking with a different frequency than SP/DIF. You could contact Elso Kwak for a circuit... (see also my Nonoz page at www.fedde.tk)

Fedde

 

[Rarkov]

Are OK - Thanks.
However - since this circuit is solely for the input of I2S, I would not be able to reclock the SPDIF...Have I caught the wrong end of the stick?!

Thanks,
Gaz

 

[Peter Daniel]

You can reclock all free lines in I2S signal. That's exactly what I'm doing with signal between Crystal receiver and DAC. And it makes a difference. You can add another small board, with a clock, reclocking chips and PS for the circuit. I'm also using a separate transformer for that. This can be added later.

 

[fedde]

Re: Re: Single Dac circuit

This is my currently best DAC, it's better than anything I tried with oversampling and it's also better than TDA1541 in my Marantz CD-94 (non oversampling and partly modified). It may be not the first word in dynamic...

Try an 8V supply!

Or did I suggest that before ?

Fedde

 

[stefanobilliani]

You can reclock all free lines in I2S signal. That's exactly what I'm doing with signal between Crystal receiver and DAC. And it makes a difference. You can add another small board, with a clock, reclocking chips and PS for the circuit. I'm also using a separate transformer for that. This can be added later.

I recloked an old Philips CD630 bypassing the saa7220 digital filter(4Xfs) and connecting the clock directly to the receiver saa7310.I used the Elso KC-7 ---- thanks Elso , your clock sounds great I love it!------and also the SPDIF output works better .

Peter,
I would like to learn something more regarding reclocking between the CS8412 and the TDA1543, can it be done with the CK-7 and if yes , where can I find schematics for reclocking chips?

Thanks

 

[Rarkov]

Hi,
I tried to connect my TDA1543 DAC to the CD-PRO2 yesterday and got noise - and only noise! I connected:

BCK to Pin 2
WS to Pin 3
DATA to Pin 4

All on jumper 1005 of the CD-PRO2 unit. Is this correct? What could the problem be? I did not reclock...Just added 5V and connected those three lines to the transport.

Thanks,
Gaz

 

[stefanobilliani]

Are you using 5volt for the TDA1543?

 

[Rarkov]

Yes. 5V supply.

 

[vuki]

Gaz,

are you using correct TDA1543 version? TDA1543A doesn't accept I2S format.

 

[Rarkov]

No, it is the normal TDA1543...I didn't know they did an "A" version

 

[fedde]

You can measure the DC voltages of the I2S signals to see if they do something. Did you use correct I/V resistors and Vref resistor !?

Fedde

 

[bqc]

If you have the 8 pin DIP package,
BCK is pin 1
WS pin 2
Data pin 3