Asynchronous I2S FIFO project, an ultimate weapon to fight the jitter

If yes, is it possible (for DSD-only use) to replace only the 45 one by an SC-Pure 45 clock?
Yes, it is possible. You can upgrade with only one SC-Pure 45 and keep the other 49 one.
On the FiFoPi Q7, how can I tell which clock is the 45 one, the one at U7 or at U13? I see no difference between the two stock clocks.
I am asking so that I replace the right one with the SCPure 45 I purchased.
 
I am not home now but there is something written on the clock to mark the difference. I think you have to remove them.
Make sure you put it back the same orientation (pin 1 is marked with an empty dot on the board). Same thing with thew SC-Pure, there is an empty dot to guide you on pin No. 1. Don't use the words on the clock. You can see a few pictures here on this forum, look at pictures from @fusion360guy a couple of months ago.
 
On the FiFoPi Q7, how can I tell which clock is the 45 one, the one at U7 or at U13? I see no difference between the two stock clocks.
I am asking so that I replace the right one with the SCPure 45 I purchased.
On FifoPi Q7, it doesn't matter you install XO clock to which socket, U7 and U13 are all OK. But if you want to know which is which frequency, a MonitorPi or MonitorPi Pro can tell the real frequencies on the OLED screen.
 
I am not home now but there is something written on the clock to mark the difference. I think you have to remove them.
Make sure you put it back the same orientation (pin 1 is marked with an empty dot on the board). Same thing with thew SC-Pure, there is an empty dot to guide you on pin No. 1. Don't use the words on the clock. You can see a few pictures here on this forum, look at pictures from @fusion360guy a couple of months ago.
Thanks!
I removed one clock but the backside has no lettering or marking, and the topsides seem identical.
The orientation here is indicated by a little half moon indent between pins 1 and 4: see pic. So that seems clear. The same indent is present on the board socket.
But I want to make sure that I remove the stock 45 and not the stock 49 before inserting the SC-Pure 45 -- so I still have to figure that out...

@iancanada :
In the absence of a MonitorPi: when produced, is the 45 clock always at U13 and the 49 at U7. I saw this orientation on a pic with Acusillion clocks. Or is the placement random?
And is there any harm done when I run it with two 45 clocks? If no, I could just use the trial and error approach.
 
I forgot the pic...

Screenshot 2023-11-07 111735.png
 
  • Like
Reactions: 1 user
Still not back home.

Here's a link with previous post on this thread.

https://www.diyaudio.com/community/...eapon-to-fight-the-jitter.192465/post-7460001

See the order of the two clocks (only one SC-Pure). As Ian said, placement could be random.

Hope this helps.
Thanks again! Indeed in the post you shared there is a pic showing the 45 SC-Pure on U13 and the 49 Accusilion on U7, so I guess this is how the frequencies are placed when produced. Just being careful as I do not want to break anything...
 
  • Like
Reactions: 1 user
I know. Also look at pages 504 and 505. Most of the discussions are in pages 495 to 500-ish, this is when the SC-Pure became available.

I did not find anything in this thread on how to identify which original clock is 45 or 49....

If you are using MonitorPi, i would switch the clocks and see if it displays differently.

We know the original clocks are Acusilicon 318B 45 and 49 but maybe there are no markings. I have 4 sets of clocks for testing and I am using the UC-Pure boxes for storage. This is why I think there was a way to identify the original frequency.
 
More circumstantial evidence on page 504: in the pic with two SC-Pure clocks there, the 45 one is on U13 and the 49 one on U7.
But I guess the safest way is to just remove one stock clock. If the remaining stock clock can play f.i. 24/96, I will leave it in. If not, I will swap it for the other stock one. And next I will put the 45 SC-Pure in the other slot.
 
Thanks!
I removed one clock but the backside has no lettering or marking, and the topsides seem identical.
The orientation here is indicated by a little half moon indent between pins 1 and 4: see pic. So that seems clear. The same indent is present on the board socket.
But I want to make sure that I remove the stock 45 and not the stock 49 before inserting the SC-Pure 45 -- so I still have to figure that out...

@iancanada :
In the absence of a MonitorPi: when produced, is the 45 clock always at U13 and the 49 at U7. I saw this orientation on a pic with Acusillion clocks. Or is the placement random?
And is there any harm done when I run it with two 45 clocks? If no, I could just use the trial and error approach.
Default is 45 left and 49 right. But you have no problem to change the position. The default XOs are AS318=B 2025. You can see the frequency numbers on top using a magnifier.
 
  • Like
Reactions: 1 user
I've had big problems since the LifePO4 MKIII power supply burned out

i got a new one, but since then the ES9038Q2M dual mono dac can't connect...on the controller i get the message no signal

i have now also ordered the new controller, the monitor pi pro...even with this it can't find the dac...on the old controller, only the dots were flashing

on the dac only the 3 red lights are on
 
Sorry, being careful again...

At first it seems straightforward: the stock clocks have this orientation

1 4
2 3

where the half moon is between the 1 and 4 and the little hole ('o') is at pin 1:

1699374771565.png


The SC=Pure has no half moon, but does indicate the pin numbers:

1=DE
2=GND
3=OUT
4=3.3V

However it has an 'o' (top left) on the case above pin 2 :
1699374922847.png


Can I ignore the 'o' on the SC-Pure and just let the pin numbers decide?

It stays in its box until I know :)