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Old 21st December 2004, 07:53 AM   #11
Bricolo is offline Bricolo  France
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Quote:
Originally posted by hifi
This method of reclocking is stolen from DDDAC. It works I have used it my self (for one TDA1543).

The main problem is it is not synchronous to the data stream so when the oscillator drifts you will either lose a sample or use the same one twice, when that happens the resulting jitter is ...

If I read the schematic correctly the tl431 shunts are not in parallell but one is for the oscillator and another for the 4040 divider.

IMHO it's not the best way to reclock. Assynchronous at 11MHz seems odd

And it's someone else's intellectual property!
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Old 21st December 2004, 09:16 AM   #12
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Talking RE-clock for the TDA1541a non-oversampling DAC.

Dear hifi & Andypairo,

this is a very common design of the re-clock. This is not stolen from any other website.

all the chips & circuits were standard one. I made this one was for my TDA1514A non-oversampling kits.

pls study.

thx

thomas
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Old 21st December 2004, 09:16 AM   #13
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Angry RE-clock for the TDA1541a non-oversampling DAC.

dear hifi & Andypairo,

this is another design, also very popular.

pls take a look & study.


thx

thomas
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File Type: jpg reclock-circuit-74hc74a.1.jpg (95.3 KB, 720 views)
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Old 21st December 2004, 09:16 AM   #14
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Talking RE-clock for the TDA1541a non-oversampling DAC.

dear Bricolo,

I had one questions.

why synchronous to the data stream will be better than Assynchronousr. Will it real be more accurancy???
not need to any matching??

pls advise!


thx

thomas
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Old 21st December 2004, 10:49 AM   #15
etexte is offline etexte  Romania
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Default Re: RE-clock for the TDA1541a non-oversampling DAC.

Quote:
Originally posted by tube-lover

this is a very common design of the re-clock. This is not stolen from any other website.

all the chips & circuits were standard one. I made this one was for my TDA1514A non-oversampling kits.

pls study.
We can not study!!!!!!!!
You forgot to upload it again
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Old 21st December 2004, 11:23 AM   #16
Bricolo is offline Bricolo  France
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Default Re: RE-clock for the TDA1541a non-oversampling DAC.

Quote:
Originally posted by tube-lover
dear Bricolo,

I had one questions.

why synchronous to the data stream will be better than Assynchronousr. Will it real be more accurancy???
not need to any matching??

pls advise!


thx

thomas

I did not say that synchronous was worse, or that assynchronous was better.


Assynchronous works because it's own clock is at a (much) higher frequency that the signal you want to reclock. So even if the 2 clocks aren't in phase, the difference can be negliged. Have a look (just a look ) at Elso's ASR

Synchronous reclocking works (not necessarely) with the same frequency as the main clock. And as its name is self explicit, the 2 clocks are synchronous (you can use the same clock for the transport, dac and reclocker, or lock the reclocker's clock on the first one). You don't need a higher frequency because you want to reclock the edges of your signal, that have to be synchronous to the clock.
But imagine, like hifi said, that your reclocker's clock drifts (and it will, you will always have a phase difference between 2 free running clocks of the same frequency, and you'll also have some phase variations) you'll place an edge where your reclocker's clock thinks there should be one, but according to the main clock, there shouldn'g be one. 0 instead of 1, 1 instead of 0... This will be rare (maybe a few times per second, or a few each 10s) but adding false bits isn't the aim of the reclocker.
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Old 21st December 2004, 12:59 PM   #17
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Default Re: RE-clock for the TDA1541a non-oversampling DAC.

Quote:
Originally posted by tube-lover
Dear hifi & Andypairo,

this is a very common design of the re-clock. This is not stolen from any other website.

all the chips & circuits were standard one. I made this one was for my TDA1514A non-oversampling kits.

pls study.

thx

thomas
The first circuit looks identical to dddac's, which is quite "old" and well-known.
Of course it's not possible (or very hard ) to use the same components for the same purpose with a different schematic but in the first post you said "I designed" and it seemed a sort of "originality" claim, that seemed odd to me.

The second instead is unknown to me... looking at the components I thought it was derived from Elso's ASR but it is not.
Will study it and maybe try it out... maybe it works even better

Cheers

Andrea
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Old 21st December 2004, 08:26 PM   #18
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Well, you guys are funny! Whenever you see something familiar then immediately start to shout IP! Get real! You thought all of the great DIY ideas were all originated from diyaudio or someone related? diyaudio.com is the only audio DIY world? Wake up, there are hundreds thousands of active DIYers outside diyaudio.com keep creating new ideas and new things. Lots of *new* things you saw here probably had already been done by someone else long long time ago. In other words, before you open the mouth talking about IP, at least politely do some background checks first, OK? It never hurts to ask first before you come out a conclusion! Otherwise you will only make yourself a big fool and help nobody here. People will not bother to share their designs here anymore.

Reclocking WCK is not a new idea at all, definitely not invented by Doede and he has never said it's his new idea! The idea and the circuit are so simple such that everybody will come out pretty much the same implementation. So where is the IP here? If Thomas has to ask Doede's permission here, shall he also ask hundreds of people who have done the same design before?

Reclocking WCK stuff is very popular in Asia's DIY world I believe, for instance:


http://myweb.hinet.net/home1/prbstec...eclocked-1.htm

Look at the bottom of the page.

If Thomas intended to copy someone's *IP*, he should have had many other choices, not just Doede's.

Oh, BTW, I have seen several DAC designs in China using AD844 similar to the way Pejda did. Again, no biggie there, too.


-finney
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Old 22nd December 2004, 07:17 AM   #19
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Unhappy RE-clock for the TDA1541a non-oversampling DAC.

dear Andypairo,Bricolo,etexte,hifi & all readers of my thread,

First of all I said very sorry for my BAD English & cause too much noise. My bad english & worse to choose real words to present for the re-clock cause too much missunderstanding. One more time sorry to this.

Diyaudio was a very good place to share experience from world's diyers. I understood Andypairo,Bricolo,etexte,hifi's thread, they worried the copyright of diyer's idea. Me tooooooo. So why I print the PCB in Taiwan, not in China?? I was afraid that all street
was my products. I thought all diyers develope his idea,
paid more more effort to make them idol & prefect. Me too.

I had some good friends in taiwan to help me to purchase chips in good price because they all were superior in big computor mother board factory. I also dealer of some japan product's. Parts & chips can bought in good price why not benefit to other diyers in overseas. Am I wrong???????????

I was not maintain my life in diy business, so I prepare one new item will not as big company considerate the profit first. I will considerate the best that I can use to make them prefect.

BTW, sorry to cause misunderstanding for my idea. Let us share diy experience!!!!!

this re-clock link was one of my friend told me.

pls take a look to reference.

http://pc.watch.impress.co.jp/docs/2.../nishikawa.htm

this link was from japan, Japan was very serious about the copyright. So I think this circuit will not stolen from other website. So..... just for a look. OK!!


thx

thomas
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Old 27th December 2004, 10:34 AM   #20
hjelm is offline hjelm  Sweden
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To get this back to a technical discussion .
I still see two lm431 shunts in parallel, can you do that. I would think that the devices are hard to match such that both of them are working. Any opinions?
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