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

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#13,081
TheodorM said:
Hi @Steviewunda, I am another Greek guy like Panos in the process of building the TDA1541A DAC.
I also want to ask which software are you using? I am trying to setup PiCorePlayer with down-sample to 44100Hz. Also want to ask if also the bit depth should be adjusted to 16Bit. Currently, I see from IAN CANADA MONITORPI shows 32b on the top right corner of the screen.
Click to expand...
I am using JRiver and Diretta ASIO on a Windows 11 PC, playing to Gentooplayer and Diretta Target on a RPi4-based Ian Canada stack which is capped with Gabi's TD1 DAC. My MonitorPi also shows 32b in the top right..but I don't know what this means 😉
 
#13,087
monitor Pi pro sits in front of it.
is not an easy thing to build in.
also the Rotary encoder, infrared and Pure output LED behind the smoke glass.
 

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#13,090
VMRKarnati said:
Hi,
I need advice on power connectivity options.

Current Setup:
We are using Pure Pi II to achieve both Streamer and DAC in one stack with the following components:
  • Pure Pi II
  • RPi5
  • DDC+USB
  • Q7
  • AES
  • Dual Mono II
  • OPA861
Power Connections:
  • Following one of Gabster video, we have powered the OPA861 using two 5V 3A adapters with “+ (+ -) – “ connections.
  • Interconnected wiring from Pure Pi II 3.3V to Q7 3.3V, and another cable from the same Pure Pi II 3.3V port to the Dual Mono II DAC IN.
  • Using the 27W RPi 5 official adapter plugged into the Pure Pi II Type C charging port is problematic - Stack starts but shuts down in 2-3 seconds. Many have reported that this adapter works with Pure Pi II, so I may be missing something. Any settings I should check?
  • Currently, I'm using the 27W RPi 5 official adapter plugged into the RPi Type C charging port, which brings up the entire stack.
Questions:
  1. If I connect the 27W adapter this way, am I not fully utilizing Pure Pi II functionalities? (from the observation looks like Pure Pi II is also functional with batteries backup). Are there any disadvantages or quality differences with such RPi 5 direct connection instead through Pure Pi II?

As next move Planning to Add UcConditioner MkII 3.3V:

To integrate UcConditioner MkII 3.3V, here’s the planned power connections:
  1. 27W RPi 5 official adapter plugged into the RPi 5 Type C charging port (If there's a fix to work with the Pure Pi II Type C port, I'm happy to follow).
  2. Pure Pi II 3.3V to UcConditioner MkII 3.3V IN.
  3. UcConditioner MkII 3.3V OUT to Q7 3.3V IN.
  4. Another interconnection from the same Pure Pi II 3.3V to the Dual Mono II DAC card (Is this feasible without issues?).
  5. Dual 5V 3A power adapter connected to OPA861 with “+ (+ -) – “ connections.
Questions:
I want to ensure these connections won't create any challenges, especially Point 4 - when using the same Pure Pi II 3.3V port to DAC IN after integrating with UcConditioner MkII 3.3V.
Clarification to Point 1 with solution if available.

Please advise if you foresee any issues with these planned connections to support both Stream and DAC stack.

Thanks a lot in advance.
Click to expand...
In Extension to this, Need advise on the power connectivity options....Please

Looking for Streamer + DAC in one stack to have minimal design. step by step upgrades will be planned later.
  • In order to utilize available UCConditioner MKII 3.3
  • Need advise out of below 2 power connectivity options which one works , if both works, which is better - safety and quality wise...
Power connectivity Options : for a single stack of both streamer+Dac plan
  • Pure Pi II 3.3 -> UCConditioner MKII 3.3V IN
  • UCConditioner MKII 3.3 Out -> BOTH Q7 and Dual Mono DAC card AVCC (J1)?
    • Will this even work with out messing up any thing? particularly Dual mono DAC being connected from same UCConditioner MKII 3.3 output along with Q7.
    • If this works at DAC card end to which one we need to plan to connect AVCC (J1) or DVCC port (J2) or VCCA (J4)?
or
  • Pure Pi II 3.3 -> UCConditioner MKII 3.3V IN
  • UCConditioner MKII 3.3 Out -> Q7
  • from same Pure Pi II 3.3 -> Dual Mono DAC card AVCC (J1)
    • I think Q7 should be fine with this. But, Hope DAC portion will be fine as well? having connection from same Pure Pi 3.3 even after Q7 served by UCConditioner MKII 3.3. AVCC (J1) should be fine to pick as well?
FYI, Having OPA861 connected with two 5V 3A adapters with planned +5 0 -5 connectivity. Eventually will upgrade this area as well with better options.

Thanks a lot in advance.
 
Last edited:
#13,094
miklau said:
What USB-C power adapter are you using and at what rated current?
Click to expand...
Just another follow up on this...I mentioned in another post that my3.3 v UCPure after a while starts making a clicking sound, which I narrowed down to the relay on the UCPure, which I replaced. I tested it for a few days and the problem seemed to be resolved. I have a UCPure II which I switched back too, and after a long listening session it started doing the same thing. I think I have it narrowed down to the USB-C power adapter. As I said it is 2.1A.. I tried an official RasberryPi5 power adapter, and I couldn't get the UCPi to power on at all. Very strange. (It would charge my phone, and I tried it on a pair of bluetooth headphones, and it worked fine on that). Very strange indeed. So I ordered a 5v 3Amp power block, which will be here tomorrow, and I'll see if that does anything.
 
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#13,095
VMRKarnati said:
Using the 27W RPi 5 official adapter plugged into the Pure Pi II Type C charging port is problematic - Stack starts but shuts down in 2-3 seconds. Many have reported that this adapter works with Pure Pi II, so I may be missing something.
Click to expand...
Hey, I just saw this. I have tried two different RPi5 adapters with a UCPi and I couldn't get either one to work. Wouldn't even power up. I ordered a 5V3A wall charger, rated at 18watts. I'll post if it works with my setup. I have been using a 5v 2.1A wall charger, but after a while my UCPure cuts on and off, and I am pretty sure it is the USB charger on the UCPi causing the problem. If that doesn't work I guess I'll try the RPi3 adapter, which is rated at 5V 2.5A
 
#13,097
redjr said:
Clicking relay and shutting down is a symptom of not enough current.
Click to expand...
Nice theory...my new wall wart didn't solve the problem. In fact I'm convinced now it is NOT the wall wart that's the issue. No idea how exactly how to solve the issue, but I am working on it. I think it's possible the relay on the 3,3 UCPure was damaged by the under current of the UCPi wall wart. I will try my other UCPure that I replaced the relay on and see if the issue repeats.
 
#13,098
redjr said:
Clicking relay and shutting down is a symptom of not enough current.
Click to expand...
Apparently when I plugged in the new wall wart, and turned on the UCPi, my UCPure was switched off, but it powered on anyway, and that may have been the cause of the relay shutting down. I powered up the UCPi a few minutes before playing music, and the UCPure was all lit up, but as soon as music started playing it started clicking on and off, that's when I realized the UCPure switch was turned off. Turned it on and played music for a while today with no issues. Hopefully it's fixed!
 
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#13,099
Hi you all. The answer is probably somewhere in the 655 pages. Sorry about that. I bought a combo of rpi 4 and fifopi q7II, transport pi aes and purepi II.
As i don t have batteries yet i fed the stack with a usb c adapter. The switch on the purepi is on on.
Connection with sonnet Morpheus dac is over aes and coax.
I play qobuz over volumio. Now the question: which dac do i choose in volumio? Generic i2s lets music play, but no sound from the dac. It says 'no data'.
When. I choose hifi digi pro + i get a failure saying: failed to open alsa.

I already flashed a fresh volumio.

Any suggestions?
 
#13,100
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