Cronus - It's about time.

[Luanak]

Hi Russ
It is possible to obtain with Cronos, independently left and right data (no multiplexing I2S) from a PCM stream?
It is to connect my TDA1541 DAC in simultaneous mode.

 

[Russ White]

It is definitely technically possible from a hardware perspective - provided such a stream is input exists. For the BBB this would mean a properly configured driver - not sure such a driver exists. I don't think the Amanero supports that.

The Cronus itself will not convert I2S or anything else to such a signal.

 

[xavier1000]

Hi Russ,

I have BBB-> Hermes -> Chronus -> BIIIse as per the picture.

An externally hosted image should be here but it was not working when we last tested it.

My clocks are 45/49. Everything is working correctly except for the fact that I have to put the clock divider in 1:1. When switching to 1:2 (or even 1:4) then I don't get lock.

I saw zz1969 had a similar problem:

Yep, I guessed that. I will check. If the divider is dead what is the next step, I wonder? Can it be repaired or the setup needs a new Cronus?

I checked and re-solded just in case J1:2 without success. Do you think the divider could be dead as well?

Thanks

 

[zz1969]

In this configuration like yours I had no luck. Though installing back the clock shunt on BIIISE and removing MCK cable I received a lock (meaning the divider is good?) So I think the problem lies somewhere else.

 

[Russ White]

Sounds like two seperate problems.

If you have access to a scope the best thing would be to check for the presence of the correct clock on the Hermes header for each jumper position.

 

[pdeoliveira]

Now, it's time for optimisation ... I'm going to build the power supplies. Is there any requirement for the sequence of the supplies that needs to be applied to the different elements ? for example, BBB first and then Hermes, then Cronus then DAC ? Or maybe, it could be in any order ?
Any recommendation ?

Many thanks for any help !

 

[Russ White]

Because they are isolated from each-other the power up sequence is not critical. But keep in mind playing from the BBB will fail until the Cronus/Hermes are up. Just power them up at the same time and you will be fine.

 

[xavier1000]

Sounds like two seperate problems.

If you have access to a scope the best thing would be to check for the presence of the correct clock on the Hermes header for each jumper position.

An update before checking with the scope tomorrow:

I tested switching the jumper to 1:4 and... Bingo! Everything was working perfect with signals from 44.1 Khz to 384Khz. Not sure I express mself clearly in my previous post, but setting the jumper to 1:1 I was getting lock and sound, but everything was way too fast. When switching to 1:2 the signal was not even locking.

I was under the impression that the correct configuration was with 1:2. Did I miss something? Is this correct?

 

[xavier1000]

I did some measurements on the 3 jumper positions (J1:1, J1:4 and J1:2) using my old scope:

An externally hosted image should be here but it was not working when we last tested it.

J1:1 This measurement is almost in the limit for my 50Mhz scope, but we can see a signal of approximately 50Mhz (each division 0.02 uS for all measurements)

An externally hosted image should be here but it was not working when we last tested it.

J1:4 Here we can measure approximately 25Mhz, which is surprisingly the half of the frequency from J1:1

An externally hosted image should be here but it was not working when we last tested it.

J1:2 This one seems totally wrong

 

[Russ White]

Yes - this appears to be a dead divider - I have seen at least two others fail in this this mode - one (mine) when the 1:2 output was accidentally shorted.

 

[xavier1000]

This would explain why the 1:2 output is no working. But then I was wondering why am I getting half of the frequency in 1:4?

 

[Russ White]

Not having designed that IC - I can only guess (it was a head-scratcher for me too) that it is because a stage of the flip-flip chain is being shorted internally. The good news is - if all you need is the 1:2 signal it may still work just fine.

 

[xavier1000]

In fact I only need the 1:2 signal so it's OK for me then.

Thanks for your support!

 

[dem626]

How to remove XO trident?

You must always remove the XO trident if you use an external clock. You don't do anything with the XO itself - leave it alone.

For dual mono with B3 or B3SE I would suggestion async mode (just leave Buf configured normally with XO trident) - but if you go synch you need to route the master clock to both DACs.

In any case for dual mono you just route all signals (except MCK if going async) to both DACs.

Can anyone explain this in more detail please? I have a B3. I can't figure how to remove XO trident.

Thanks,
Doug

 

[dem626]

I'm going for async mode. Do I need to remove XO trident?

 

[Duffy Moon]

I'm going for async mode. Do I need to remove XO trident?

No, you only need to do that for synchronous mode.

 

[GaryB]

Can anyone explain this in more detail please? I have a B3. I can't figure how to remove XO trident.

Thanks,
Doug

See the attached picture. Just pull the trident regulator labelled VDD_XO. I've circled it in red.
---Gary

 

[mjock3]

Hooking up to Buffalo III

Getting ready to hook up and want to verify. The only to hook the Cronus up to a Buffalo III (non SE) is via the sidecar, is this correct?

Thanks

 

[miero]

You can connect it directly, check this picture of B3+Cronus:
http://bbb.ieero.com/cronus-hermes-bbb.small.jpg

 

[DQ828]

I am about to build a BIIISE based DAC and was wanting to know if it is possible to use the Cronus setup to reclock an Amanero and Coax inputs, then have some sort of switching to jump between the inputs. If it is possible how would you do the switching?