rblnr;190985 Wrote:
Actually, turns out Empirical does not do such a mod. Any other ideas
anyone?
Actually, we do something along these lines. Not a word-clock, though.
My newest layout of my Pace-Car reclocker will take I2S or S/PDIF as
input from the SB3 (we can mod the I2S interface into
After some serieus listening and comparing to my cd transport I do not
hear much of a difference anymore while before the difference was quite
clear. So adding the external clock + reclocker seems to be a major
improvement :-)
It would be nice though to compare it to a non-modified SB3..
Jitterbug;193678 Wrote:
-I bypass the HCU04 and go directly to pin 42 on the XILINK.
I dare not to solder directly to the xilink :(
Jitterbug;193678 Wrote:
-Rather than using a 50R/25R voltage divider to get from the X03's 5V
to the needed 3.3V, I use a 100R resisitor from the clock
Jitterbug;193868 Wrote:
I set up Arta, but to be honest am fairly clueless about how to use it
On the top row, there are several buttons. Select SPA (SPectrum
Analyser).
With the buttons on the right side of the display, use Top and
Range to obtain 0 at the top of the display, and -140 at
tingtong5;193218 Wrote:
My SB3 is running now on an external clock (XO3 module from Tentlabs).
Also the spdif output is relocked now before send to the DAC.
Now I'll need some time to listen and to compare it to my cd transport.
First impression is that the differences between the two have
Jitterbug;193678 Wrote:
I also take the SPDIF dirctly from the XILINK, so have take the hex
buffer completely out of the circuit - in fact right off the board.
Exposing the XILINX to the external world would make me nervous ;-)
It definetely may work, but there are a handful of other
jlmatrat;193721 Wrote:
Exposing the XILINX to the external world would make me nervous ;-)
It definetely may work, but there are a handful of other components
between the HCU04 and the S/PDIF jack, including a small resistor
useful to protect from accidental shorts on cables or jacks.
More,
Jitterbug;193735 Wrote:
I would also be concerned if I was going externally with the signal.
However, the SPDIF output is hardwired to the X03 which reclocks the
signal and sends it onward to a RAKK DACC, again hardwired.
OK then, I was not getting the whole picture.
Any comment or advice
I've been using the RAKK DAC for about a year and enjoy it a lot.
Compared with the other DAC I own, the MF A32.24 I find it much more
lifelike and engaging. One of the nice things about it is that it's
built to tightly couple with Guido's XO-DAC. There is a MK 2 just out
which does upsampling. I
Mark Lanctot;193293 Wrote:
The WAF must be through the roof on that mod! :-)
Did something about that today. The new box also contains the 5V
regulated power supply.
+---+
|Filename: DSC02566.jpg
Ah, the case-to-prevent-fall-apart. Very nice!
I wasn't criticizing, BTW. I have no WAF to contend with. Right now I
have computer parts strewn all over the hallway...
--
Mark Lanctot
Mark Lanctot's Profile:
My SB3 is running now on an external clock. Also the spdif output is
relocked now before send to the DAC.
+---+
|Filename: DSC02562.jpg |
|Download:
The WAF must be through the roof on that mod! :-)
--
Mark Lanctot
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Mark Lanctot;193293 Wrote:
The WAF must be through the roof on that mod! :-)
FÖck the WAF! (literally)
--
P Floding
No, I didn't ABX it. And I won't even if you ask me. (Especially not if
you ask me.)
P Floding's
Hi folks,
I take the opportunity of reporting my own modest experience with
clocks and SB. Actually, it's a SB2 I played with, so components
references and pinout in the following may differ for a SB3.
I elected a D-Clock from NewClassD, the new home for Lars Clausen,
formerly at LCaudio.
OK,
here is a link to the full sized version.
http://johnswenson1.home.comcast.net/stereo/SBI2S.gif
I hope this is more readable.
John S.
--
JohnSwenson
JohnSwenson's Profile:
Perfect. Thanks John!
--
RioTubes
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Here's a schematic I drew up for someone else doing exactly the same
thing. Note I have not actually implemented exactly this schematic, in
my DAC I'm using an FPGA to do the converting etc, but this SHOULD
work, I've simulated this and it does the right thing.
Note the circuit for shfting the
Fantastic! You are very generous John. Having a little difficulty
reading the small font for component ID on the schematic. Would it be
possible to post a file attachment or send pm? Thanks, Mike
--
RioTubes
RioTubes's
Thanks Rio.
--
rblnr
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___
Actually, turns out Empirical does not do such a mod. Any other ideas
anyone?
--
rblnr
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View this thread:
So how did it work? Do you have the SB playing off the external clock?
BTW I want to clear up some terminology here, there seems to be some
misunderstanding between word clock and MCLK or sysclk. A word clock
is a clock with a frequency equal to the sample rate (a word in this
case is all the
Oops, I didn't answer Rio's question. As long as you are doing the
reclocking in the DAC the jitter in the SB doesn't matter much. This
means you can use horrible transmission technology to get the MCLK into
the SB and as long as it can see some vestige of a square wave it will
work fine. My
Thanks for chiming in John. After considering your prior feedback and
reading up on synch reclocking I've managed to create a schematic which
is attached. Does it look like it might work? The right side (i.e. my
external DAC schematic) is fortunately all done. I just need to create
a resynch
RioTubes;190474 Wrote:
Ronald, the pic is to small to tell if you connected the clock input
cable's ground to a handy clock reference point on the SB3 board?
Well that might have been my big mistake.. I used a wire to connect
ground from one of the rca output ground to the other end of the
seanadams;190475 Wrote:
Where exactly? I see only heat shrink tubing around the sleeve of that
coax where it connects to the pcb.
Have you got a scope?
The shrink tubing is there to isolate the shield from the SB3's smd
component. I connected a ground wire to the other end of the coax which
So I guess I need to try again and do it the right way this time :P
Now I have to find a good ground reference point on the circuit board
somewhere near the pad which serves as the external clock input..
--
tingtong5
One of us is missing something here... you need to connect the screen of
the coax cable to ground at BOTH ends.
edit: I see you noticed that 2 minutes ago... ;)
--
AndyC_772
AndyC_772's Profile:
AndyC_772;190497 Wrote:
One of us is missing something here... you need to connect the screen of
the coax cable to ground at BOTH ends.
edit: I see you noticed that 2 minutes ago... ;)
Yes I am aware of this now :P
The ground of the external clockboard was connected to the ground of
the
tingtong5;190496 Wrote:
So I guess I need to try again and do it the right way this time :P
Now I have to find a good ground reference point on the circuit board
somewhere near the pad which serves as the external clock input..
The small caps on either side of the crystal are connected to
Ronald,
I'm thinking of doing the same...synchronous reclocking using the mclk
in the Dac...following John S's lead.
Are you buffering the mclk output out of the dac? I'm trying to assess
how critical this is. I'm thinking of placing an SB3 board inside my
dac to keep the cable as short as
Can anybody point me toward a modder who can add a word clock input to
my SB3? Want to use it w/the word clock out of my EMM Dac2SE. Thanks.
--
rblnr
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rblnr, empirical audio can do this. Steve Nugent.
http://www.empiricalaudio.com/
--
RioTubes
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View this thread:
Last weekend I removed the 11,28 MHz crystal from the SB3 and tried an
external Tentlabs clock (same frequency of couse and a level of 3,3V).
By the way the blue coax is the spdif output, the black one is for
external clock input.
(the next step would be to slave the SB3 to the master clock in
I can't quite see from you photos, but you do have a ground reference
between the SB3 and the tent clock board, don't you?
--
Patrick Dixon
www.at-tunes.co.uk
Patrick Dixon's Profile:
Please tell me that's an anti-static towel you're working on... ;)
--
AndyC_772
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Patrick Dixon;190250 Wrote:
I can't quite see from you photos, but you do have a ground reference
between the SB3 and the tent clock board, don't you?
Yes I do... :P
--
tingtong5
tingtong5's Profile:
Ronald, the pic is to small to tell if you connected the clock input
cable's ground to a handy clock reference point on the SB3 board?
--
RioTubes
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tingtong5;190305 Wrote:
Yes I do... :P
Where exactly? I see only heat shrink tubing around the sleeve of that
coax where it connects to the pcb.
Have you got a scope?
--
seanadams
seanadams's Profile:
miklorsmith;189780 Wrote:
You can add a wordclock in to the SB3, but this is strictly a custom
operation for a modder. The clock chip in the SB is deactivated and
hardwired with a dedicated clock cable.
I suppose you mean a BIT clock? 11,28 MHz is a bit clock not a word
clock :P
--
Phil Leigh;189773 Wrote:
I was wondering how hard it is to add a wordclock out to the SB3 and a
wordclock in to my DAC (MF X-DACv3)...so that the DAC can slave to the
sb3 without relying on the SPDIF clock...anyone done anything like
this? - is it a DIY option?
I assume you mean a wordclock
P Floding;189874 Wrote:
I assume you mean a wordclock input (or clock input) to the SB3, and a
wordclock output from the DAC?
Er yes sorry my total mistake - that is what I meant of course - sorry
Sean!
--
Phil Leigh
Hi Ronald,
so it sounds like you want to get data out over the S/PDIF, but feed
the clock in to the SB3. This should work fine.
Taking a 74HC chip directly into a 75 ohm impedance is not a good idea,
they are not designed for this.
I would just leave the S/PDIF as is since you are reclocking
I was wondering how hard it is to add a wordclock out to the SB3 and a
wordclock in to my DAC (MF X-DACv3)...so that the DAC can slave to the
sb3 without relying on the SPDIF clock...anyone done anything like
this? - is it a DIY option?
--
Phil Leigh
Phil Leigh;189773 Wrote:
I was wondering how hard it is to add a wordclock out to the SB3 and a
wordclock in to my DAC (MF X-DACv3)...so that the DAC can slave to the
sb3 without relying on the SPDIF clock...anyone done anything like
this? - is it a DIY option?
I don't see how that would
Well, the clock cable is hardwired into the SB as a wordclock in. My
DAC has a wordclock out, so the DAC is the clock master.
Lessloss is convinced this is The Way to go. The best I can
understand, having two competing clocks that don't mesh perfectly are a
big source of jitter. Having the
miklorsmith;189805 Wrote:
Well, the clock cable is hardwired into the SB as a wordclock in. My
DAC has a wordclock out, so the DAC is the clock master.
Lessloss is convinced this is The Way to go. The best I can
understand, having two competing clocks that don't mesh perfectly are a
big
Hi :-)
I'm about trying the same thing. That is keeping the spdif but slaving
the SB3's clock to my DAC.
I already changed the spdif RCA connector for a BNC connector and
bypassed the inductors.
I would also like to take the spdif signal directly from the 74HCU04
since my DAC's spdif receiver
Hey, I've looked around for photos of the SB3 motherboard. Does anybody
know where I could find one?
Also, does anybody know where I could get a schematic of the clock
section so the DAC guy and installer can ensure they're optimizing the
solution.
Thanks for your help, fellas!
Mike
--
I'm really coming around to using a DAC as the clock master. I haven't
tried it but I have this DAC:
http://www.lessloss.com/
It is a really killer DAC and they tell me it's only achieving a
fraction of its potential performance. The unit has a clock output and
they say disabling the tranport
miklorsmith;180612 Wrote:
I'm really coming around to using a DAC as the clock master. I haven't
tried it but I have this DAC:
http://www.lessloss.com/
It is a really killer DAC and they tell me it's only achieving a
fraction of its potential performance. The unit has a clock output
Thanks a lot!
--
miklorsmith
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miklorsmith;180625 Wrote:
Thanks a lot!
You're welcome!
Let us know how it goes! I'm very tempted to do the same thing myself.
(Only my habit of using a TacT RCS stops me..)
--
P Floding
No, I didn't ABX it. And I won't even if you ask me. (Especially not if
you ask me.)
If the DAC outputs the 11.2896 signal you should be able to feed it into
the SB3. The SB3 takes a 3.3V logic signal so you either need that out
of the DAC or a converter to get it to that spec. It would be dangerous
to feed it a 5V clock, it might fry something.
Is this the only change? You
Thanks a bunch. The DAC does have a clock output and can output three
frequencies. 11.28 mhz is one of them. I'm not sure about the
voltage. Strangely, the Lessloss website goes into deal about the
slaving process but doesn't specify the output voltage on the clock
signal. I'll make sure to
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