Ipotesi di circuito di recloking

[riccardo]

Ho trovato questi documenti: pensate si possa buttare giù un circuito partendo magari da un clock già in vendita col suo supply regolato a 5 V?
La premessa è il funzionamento delle porte del TDA1541 o del Dac in genere:


da ciò si potrebbe pensare di "adattare" in questo modo il circuito nel caso lo si voglia realizzare:


la fonte documentale di questa associazione di idee (non so quanto congrua)
è questo documento, e il fatto che mi ritrovo un chip 74HC...



Attachment: reclocking patent.pdf ( 308201bytes )

Per far funzionare la cosa basterebbe utilizzare addirittura anche solo il cristallo originale del lettore, oppure come dicevo, per esempio, anche un Kwack Clock nel qual caso si potrebbe inserire la modifica nel circuito o schema originario..
CVhe ne pensate? Secondo voi è interessante?

Saluti

R.R.

[ELSO]

Ho trovato questi documenti: pensate si possa buttare giù un circuito partendo magari da un clock già in vendita col suo supply regolato a 5 V?
La premessa è il funzionamento delle porte del TDA1541 o del Dac in genere:


da ciò si potrebbe pensare di "adattare" in questo modo il circuito nel caso lo si voglia realizzare:


la fonte documentale di questa associazione di idee (non so quanto congrua)
è questo documento, e il fatto che mi ritrovo un chip 74HC...



Attachment: reclocking patent.pdf ( 308201bytes )

Per far funzionare la cosa basterebbe utilizzare addirittura anche solo il cristallo originale del lettore, oppure come dicevo, per esempio, anche un Kwack Clock nel qual caso si potrebbe inserire la modifica nel circuito o schema originario..
CVhe ne pensate? Secondo voi è interessante?

Saluti

R.R.


Originally posted by riccardo - 29/01/2006 :  12:37:51

Hi you can use any clock for reclocking. However reclocking as in the patent does not help! Guido Tent will disagree of course!
Asynchronous reclocking in a separate DAC may help though not for TDA1543 NON-OS.

[riccardo]

Hi you can use any clock for reclocking. However reclocking as in the patent does not help! Guido Tent will disagree of course!
Asynchronous reclocking in a separate DAC may help though not for TDA1543 NON-OS.


Originally posted by ELSO - 29/01/2006 : 18:28:21

Hello Elso, you're wellcome in this forum!!!
I am tinking to use this A. clock for a simple and old 16 bit marantz cdplayer, not for a 1543 NO dac....
What does you mean when you say that it dont' help the sound?
Where is the problem?
Txs


Saluti

R.R.

[ELSO]

Thx for the welcome Riccardo.
I have positive feedback for AD1865 and TDA1541 with asynchronous reclocking. I tried it with TDA1543 and the result was worse than without reclocking. I have no xplanation for it. All DACs NON-OS BTW

[riccardo]

Thx for the welcome Riccardo.
I have positive feedback for AD1865 and TDA1541 with asynchronous reclocking. I tried it with TDA1543 and the result was worse than without reclocking. I have no xplanation for it. All DACs NON-OS BTW


Originally posted by ELSO - 29/01/2006 : 19:18:58

I don't like (imho) particularly the N.O dacs sound.
I'm thinking to use your Kwack 7 for this asynchronous clock, but i haven't really idea about bypass cap, and i can't imagine the results.
I know the K7 is quite good, and i like its sound, but the Asynchronous clocking could be an upgrade in an marantz cdplayer with TDa1541?
And, could you say something about implementation inside the cdp, (a pcb's layout..) and logistics (excuse my english) in digital domain?? where i could locate/set the new chip, 74Hxx..?????


Saluti

R.R.

[ash_dac]

Hi,

Pedja has done a large amount of work on tda1541a, and reclocking.

74hc74 based reclocking.

The paper listed below was useful for me:-
http://users.verat.net/~rogic2/1541/pdf ... ements.pdf

Look at the graph with the frequency multiple(fs) 8.4672 MHz. I'm assuming that the patent circuit will produce something similar but I haven't tried it!

Elso do you have pcb's for your clock ?

Cheers,

Ashley.

[ELSO]

Hi,

Pedja has done a large amount of work on tda1541a, and reclocking.

74hc74 based reclocking.

The paper listed below was useful for me:-
http://users.verat.net/~rogic2/1541/pdf ... ements.pdf

Look at the graph with the frequency multiple(fs) 8.4672 MHz. I'm assuming that the patent circuit will produce something similar but I haven't tried it!

Elso do you have pcb's for your clock ?

Cheers,

Ashley.


Originally posted by ash_dac - 29/01/2006 : 21:37:10

Hi, for best result the reclocker should have a high as possible frequency. I am using a 100MHz crystal, oscillating at about 66MHz. Email me for the schematic. Pedja is using my ASR. The patent is using SYNCHRONOUS reclocking! Pedja Asynchronopus. As for your last question, you have mail Ashdac.

[riccardo]

Ok Elso, many thanks.
If it's possible, if you want, you could publish your schematics here in the forum, or, is in yours choice, if you have an article, an issue, in our Contribution Area.
Your knowledge and Diy spirits are welcome here!

Hi,

Pedja has done a large amount of work on tda1541a, and reclocking.

74hc74 based reclocking.

The paper listed below was useful for me:-
http://users.verat.net/~rogic2/1541/pdf ... ements.pdf

Look at the graph with the frequency multiple(fs) 8.4672 MHz. I'm assuming that the patent circuit will produce something similar but I haven't tried it!

Elso do you have pcb's for your clock ?

Cheers,

Ashley.


Originally posted by ash_dac - 29/01/2006 : 21:37:10

Hi, for best result the reclocker should have a high as possible frequency. I am using a 100MHz crystal, oscillating at about 66MHz. Email me for the schematic. Pedja is using my ASR. The patent is using SYNCHRONOUS reclocking! Pedja Asynchronopus. As for your last question, you have mail Ashdac.


Originally posted by ELSO - 29/01/2006 : 22:01:21

Saluti

R.R.

[andypairo]

HI,
a quick one-handed reply (the other is busy nursing my mewborn Aurora)

Synchronous reclocking can be useful in case you have a external DAC, but it has to be doni using a clean clock at the DAC and slaving the transport to it, as Linn does with Karik-Numerik.
Peufeu's Extremist DAC uses this philosophy.
While inside a cd player you gain almost nothing from just using a better clock (IMHO).

Asynchronous reclocking is another way to improve things when you have a external DAC fed with spdif (the main culprit for the dreaded jiitter), but in my understanding it works (partially) removing the correlation between signal and jitter.

Ciao

Andrea