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

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#12,725
pkonstantinidis said:
May I ask why you chose the Transformer I/V and not the OPA861?

What is your impression about the sound quality of the ESS Dual Mono DAC? What other DACs do you compare it to?

Thanks.
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I have another streamer here with transformers and I like the sound and as @redjr already indicates, it makes it all a lot more expensive with the OPA861 and additional transformers.
In terms of sound, the ESS Dual Mono DAC sounds very pleasant, large 3D stage, nicely balanced and not bulky.
I have to admit that the shunt behind it makes a big difference in terms of detail, the 2x elco silmic 25v 1000uF in front gives a nice midrange and everything sounds nice and smooth.

Previously I had a dual PCM 1794A, which sounds a bit more refined, less 3D.

my current setup now is a pi4, purePi II 3.3/5 volts, isolator II, reclocker Ma 1.5 with 3.3 v UcConditioner as input, ess saber mk2 and the iv transformers.
other clocks (ACCUSILICON) 45/49 MHz shielded and grounded.

I recently also bought a second-hand Pink Faun DAC3 USB, it is already an old one but it also sounds very nice, but less than the Ian Canada setup.
 
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#12,726
So what is the stack order for incorporating the BridgePi? I've tried many combinations today with two different DAC and Combo384 USB boards and can't get anything to work. I'm using Ropieee as my roon bridge and the Generic I2S overlay. This is my first time using the newer PurePi II, IsolatorPi, and BridgePi. If I want to be able to select the USB or the RPi, do I need the ReceiverPi DDC? (I asked that earlier, so pardon the repetition.)

My stack is from bottom to top; PurePi II > RPi > IsolatorPI III > BridgePi > Combo384/768 > DAC

When I remove the BridgePi everything works as expected. I know I've had this working last year using the StationPi Pro and USB daughter board. This is first time, I'm using a PurePi, the IsolatorPi and BridgePi(Combo384). When I bootup and configure Ropieee I turn on the USB Audio, yet Ropieee displays 'Not Detected'. And sure enough, I do not see it as definable USB port in roon's list of connections available under my main system listing. I'm using a newer mini-computer that has USB4 and Thunderbolt, so don't if that causing an issue or not. It sure seems that my BridgePi is not being recognized as being in my stack. Is there an obvious setting/jumper that needs to be set correctly to engage the BridgePi? I've tried both an RPi 3B, and the newer RPi 5. Ideas?
 
#12,727
@pkonstantinidis I noticed you use EMI filter AC input thingy.
Just to check/verify my thoughts, is that using a 10A fuse?

My transformers does 3A per winding, and the fuses on the LinearPi MkII are 2.5A according to the writing on the PCB (even though the manual mentions 3A, so I contacted Ian on this via email).
So I would think 10A is good for the AC input.
 
#12,729
Alright. Was already planning on using that I let type, but I only have a 4A model here (for use in a 3D printer at some poion).

Btw, as I was reading manuals, I noticed the Station Pi Pro has the T1 and T2 ground points.
The manual mentions to use the FifoPi ground for connecting it, or the case.

I didn't see you do that on your photo.
 
#12,730
@Ian, Apologize for all my recent posts re BridgePi. I may be asking something the BridgePi (and my stack) can not provide. Is it possible to have a BridgePi in the stack, but not use the USB input, but instead default back to I2S over the network? A switch of sorts? It doesn't appear this is achievable. Or, is there an option or setting in the MonitorPi Pro that would allow this. To do what I want, would I need to step up and include a ReceiverPi DDC and MonitorPI Pro?
 
#12,731
redjr said:
@Ian, Apologize for all my recent posts re BridgePi. I may be asking something the BridgePi (and my stack) can not provide. Is it possible to have a BridgePi in the stack, but not use the USB input, but instead default back to I2S over the network? A switch of sorts? It doesn't appear this is achievable. Or, is there an option or setting in the MonitorPi Pro that would allow this. To do what I want, would I need to step up and include a ReceiverPi DDC and MonitorPI Pro?
Click to expand...
@iancanada @redjr Lets include the appropriate Ian 😉 You will have more chance for a response.
 
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#12,733
mvaldes said:
@Matteoleon there is only one way to solder it on the PCB. If you check the pin out you will see that one pin (No. 12) is missed, you can't go wrong.
If you still have some doubt please post some picture of your stuff.
Click to expand...
Here is the photo. All the feet must be welded.?
 

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#12,734
IMAG0263.jpg

Where does the UcBalancer come into play for a 12V UcPure Build? I see a Rivet on UC3 +, but not the UcBalancer Rivet. This photo is from a user that no longer posts.

UcPure -UcPure +
Uc1 -BussBarUc2 +BussBarUc3 -BussBarUc4 +BussBarUc5 -BussBarUc6 +
Uc2 +BussBarUc2 -NULLUc3 +BussBarUc4 -NULLUc5 +BussBarUc6 -

According to these pre-UcBalancer photos, you need three UcBalancers?
05.jpg1640132639816.png

UcPure -UcPure +
Uc1 -UcBalancer?Uc2 +BussBarUc3 -UcBalancer?Uc4 +BussBarUc5 -UcBalancer?Uc6 +
Uc2 +UcBalancerBack?Uc2 -NULLUc3 +UcBalancerBack?Uc4 -NULLUc5 +UcBalancerBack?Uc6 -
 
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#12,736
VMRKarnati said:
@zabloc please share it in this thread. It will be helpful for many. thanks,
Click to expand...
Sorry for the delay, it took a bit more time than expected... Mario (@zabloc) did a nice write up how to edit the EEPROM of the RPI5 and add the line

PSU_MAX_CURRENT=5000​


As someone who never did this before, I was the Guinee Pig and added extra steps and screenshots where things went too fast for me.

At the end all worked fine and the tutorial was finally edited by Mario. Please find it attached below

I will also add to my blog post about powering the RPI5
 

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