I have built a simpler version as the one you can see om http://www.fedde.tk, with BlackGates. It sounds absolutely gorgeous!! So if Doedes dac is even better, it is absolutely worthwhile to have a try!
bsyyu said:
Hi Ben ! and others of course ,
I'v completed Doede's 1543 NONO-dac last weekend .
It's been a real pain in the *** to create adequate cooling for this amount of paralleled 1543's , especialy at the rated voltage and bias requirements ... but it's worth a full 100 percent !
I build the initial testcase PCB inside my Marantz CD63 player . took the I2S format straight from the SAA7345 decoder pinning , so shortest path I guess .
Also build a separate power supply inside the Marantz case , one section with 7805 regulator to feed the cooling fan , second section to feed the 1543 Tower ( 8 pieces in my case too ! )
Of course I will turn over to battery feed in time .
Let me be clear : This Dac completely smokes all digital predecessors I'v build before ...
The soundstage increases with LOT of space , dynamics .. wow .
Voices become so realistic .. everything play's within my livingroom right now .
Please don't hesitate , build it and see how pleasant live can get .
Yours,
Paul
Re: Photos
Hi Dean , attached URL's will show you the I2S format connection and the voltage regulator from where you can pick up the 5 volt to feed the cooling fan .
In this case you don't need to unscrew the CD63 Main PCB board , easy enough !!
I use a 12 volt / 100mA cooling fan , about 2 square inch ..... at 5 volt it provides adequate cooling performance .
Have fun , let me know if you need more information .
Yours,
Paul
http://members.lycos.nl/gloeidraad/hpbimg/ASIP0000001.jpg
http://members.lycos.nl/gloeidraad/hpbimg/ASIP0000002.jpg
deandob said:
Hi Dean , attached URL's will show you the I2S format connection and the voltage regulator from where you can pick up the 5 volt to feed the cooling fan .
In this case you don't need to unscrew the CD63 Main PCB board , easy enough !!
I use a 12 volt / 100mA cooling fan , about 2 square inch ..... at 5 volt it provides adequate cooling performance .
Have fun , let me know if you need more information .
Yours,
Paul
http://members.lycos.nl/gloeidraad/hpbimg/ASIP0000001.jpg
http://members.lycos.nl/gloeidraad/hpbimg/ASIP0000002.jpg
Attachments
NONO dac build in Marantz CD72MKII
Hi Guys !
Today I also completed my CD72MKII NONOmods .. superb sound too !!
even a fraction better then with my CD63 player . better transport = better sound !
Note that you need best available coupling capacitors !! perhaps a matter of taste ... well the Mundorf Caps I'v used are perfect .. also Audyn-cap KP-SN are good IMO .
Yours,
Paul
Hi Guys !
Today I also completed my CD72MKII NONOmods .. superb sound too !!
even a fraction better then with my CD63 player . better transport = better sound !
Note that you need best available coupling capacitors !! perhaps a matter of taste ... well the Mundorf Caps I'v used are perfect .. also Audyn-cap KP-SN are good IMO .
Yours,
Paul
Attachments
Top:
Adjusted Rref with scope so output signal is just in the middle of the upper and lower clipping point
Bottom:
Adjusted Rref with FFT analyzer so 2 kHz harmonic is lowest.
Note the increase of 3 kHz harmonic and how the higher harmonic change.
Indeed as Doede observed, there is a small window where 2 kHz contents drops very steep. But you also change the spectrum.
Just for your info.
Adjusted Rref with scope so output signal is just in the middle of the upper and lower clipping point
Bottom:
Adjusted Rref with FFT analyzer so 2 kHz harmonic is lowest.
Note the increase of 3 kHz harmonic and how the higher harmonic change.
Indeed as Doede observed, there is a small window where 2 kHz contents drops very steep. But you also change the spectrum.
Just for your info.
Attachments
Hi Rudolf , I agree .. but lot's of people out there ( including myself ) do not own such equipment .
Fortunatly there's hope for people with good ( Happy ) Ears too .
It's amazing how sensitive our ears are to harmonics ... especialy uneven sorts ..
In my situation it's quite easy to adjust Rref. I use a trimmer so can gow all the way in bias therms .
Yours,
Happy Ears
PS: Great to see so many Dutchies busy on this forum !
Thanks for the photos Paul. Did you change the clock on the CD63 as it looks like you did not reclock the I2S coming into the DAC?
Can anyone recommend a software FFT program (free preferably) that can be used with a soundcard (like the various software CRO applications available on the net)?
Regards,
Dean
Can anyone recommend a software FFT program (free preferably) that can be used with a soundcard (like the various software CRO applications available on the net)?
Regards,
Dean
Reclock
Hi Dean , no ........ not yet .
I ordered a low jitter XO few days ago ... need to wait for it to arrive ...
I'm sure this will have great sonic benefits too .
Installing the XO can be done within minutes .. Doede arranged space to add a reclock-circuit on the PCB . smart *** ;-)
Dean , are you also planning to rebuild a CD63 ? or are you just interested in this stuf ? curious .
Yours,
Paul
Hi Dean , no ........ not yet .
I ordered a low jitter XO few days ago ... need to wait for it to arrive ...
I'm sure this will have great sonic benefits too .
Installing the XO can be done within minutes .. Doede arranged space to add a reclock-circuit on the PCB . smart *** ;-)
Dean , are you also planning to rebuild a CD63 ? or are you just interested in this stuf ? curious .
Yours,
Paul
Yes, I have a CD63 that is asking to be modded. I am actually planning on building a no holds barred TDA1541 nonos DAC but also have some TDA1543 chips floating around and as it is really easy to do a TDA1543 DAC I'm looking to mod the CD63 by splicing into the I2S lines like you did to retrofit the TDA1543, but also to change the clock to a low jitter variety.
I think you will need to use your XO clock to swapout the clock in the CD63, not use it like Doede had intended (with a SPDIF receiver) to reclock. I'm not convinced reclocking is the way to go as you have 2 clocks at slightly different frequencies & phases which could cause samples to be lost. With retrofitting to a CD player, it is simple to fix the clock by using a low jitter one. A separate DAC is a different story.
Have a look at the TNT-audio site, there are a few tips to further tweak the CD63.
Regards,
Dean
I think you will need to use your XO clock to swapout the clock in the CD63, not use it like Doede had intended (with a SPDIF receiver) to reclock. I'm not convinced reclocking is the way to go as you have 2 clocks at slightly different frequencies & phases which could cause samples to be lost. With retrofitting to a CD player, it is simple to fix the clock by using a low jitter one. A separate DAC is a different story.
Have a look at the TNT-audio site, there are a few tips to further tweak the CD63.
Regards,
Dean
I think you will need to use your XO clock to swapout the clock in the CD63, not use it like Doede had intended (with a SPDIF receiver) to reclock.
Hi Dean ,
I meant to swap the original system clock !!
I was thinking about using Doede's PCB just for two reasons :
plenty of unused space left on the PCB .. and secondly , I'm prepairing an outboard 12 volt batterie/charger supply .. I dearly want to use this clean and quite supply for my XO too .
I'm only concerning a little about "how to connect" the XO output from Doede's PCB to clock location on CD63 ( or CD72 ) PCB .
I'm not sure if ( even a short ) shielded cable could cause problems ????????? probably not . but prefer to keep it as short as possible in any case ( I believe I need about 3 inches of lenght ) .
Any suggestions out there ??
Yours,
Paul
PS: Realy curious about your results too Dean , I was shocked after the Mods !! became a real NONObeliever .. hahaha .
Hi Dean ,
I meant to swap the original system clock !!
I was thinking about using Doede's PCB just for two reasons :
plenty of unused space left on the PCB .. and secondly , I'm prepairing an outboard 12 volt batterie/charger supply .. I dearly want to use this clean and quite supply for my XO too .I'm only concerning a little about "how to connect" the XO output from Doede's PCB to clock location on CD63 ( or CD72 ) PCB .
I'm not sure if ( even a short ) shielded cable could cause problems ????????? probably not . but prefer to keep it as short as possible in any case ( I believe I need about 3 inches of lenght ) .
Any suggestions out there ??
Yours,
Paul
PS: Realy curious about your results too Dean , I was shocked after the Mods !! became a real NONObeliever .. hahaha .
1541 or 1543
deandob said:Yes, I have a CD63 that is asking to be modded. I am actually planning on building a no holds barred TDA1541 nonos DAC but also have some TDA1543 chips floating around and as it is really easy to do a TDA1543 DAC I'm looking to mod the CD63 by splicing into the I2S lines like you did to retrofit the TDA1543, but also to change the clock to a low jitter variety.
Dean , I have a paralled ( 2pcs ) 1541A board almost ready for action ! so in time I can give it a try .. and compare with my 1543 Tower .
Only tiny problem with 1541 Dac is a small output signal , so I need to add a gainstage after the I/V ... nice triode stage perhaps .
Yours ,
Paul
I2S stream buffering
Hello Micke .
not yet measured anything ..
I just have a working set-up configuration at the moment .. it works .. and quite good too .
I realise there are more issues .. for example "as you mentioned " the I2S stream quality . I was thinking about that too !
Are you suggesting to use I2S buffering between transmitter and receiver ? I'v seen many circuits using external RAM for this purpose .. any suggestions at this point ?
Happy Ears
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A WOMEN A DAY , KEEPS THE DOCTOR AWAY
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Hello Micke .
not yet measured anything ..
I just have a working set-up configuration at the moment .. it works .. and quite good too .
I realise there are more issues .. for example "as you mentioned " the I2S stream quality . I was thinking about that too !
Are you suggesting to use I2S buffering between transmitter and receiver ? I'v seen many circuits using external RAM for this purpose .. any suggestions at this point ?
Happy Ears
---------------------------------------------------------
A WOMEN A DAY , KEEPS THE DOCTOR AWAY
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Hex Inverter
I will pay attention to this issue later .. so far I hear much better audible performance by adding 1543's .. so all seems oke in therms of current capabillity of the SAA decoder .
About nicely flat squarewaves >> indeed disirable too .. I will keep your input in mind my friendly Scandinavian buddy !
I will try to arrange scope measurments in the near future .
Happy Ears .
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No milk today
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I will pay attention to this issue later .. so far I hear much better audible performance by adding 1543's .. so all seems oke in therms of current capabillity of the SAA decoder .
About nicely flat squarewaves >> indeed disirable too .. I will keep your input in mind my friendly Scandinavian buddy !
I will try to arrange scope measurments in the near future .
Happy Ears .
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No milk today
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