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

[Bobfa]

I was going to send a similar note to @iancanada. The Pi5 27-watt adaptor does not work with a Pi4 either. The PurePi II starts up and then shuts down. I think it may be the Power Delivery handshake. With a Pi5 it does about the same thing.

 

[MaxB_70]

I managed to power PurePi II with MacBook Pro charger with thunderbolt USB C cable. Phone USB C cable doesn't work.

 

[MaxB_70]

It was this set up. I don't remember why I putted the black one.

 

[gizmo3]

I exchanged the PCM 1794 for an Ian Canada Ess MkII DAC plus IV passive transformers. quickly connected to hear if sound comes out.
the PurePi I has also been replaced by the PurePi II.
an isolator II and FifoMa 1.5 underneath.

Tomorrow I will connect everything better plus the right power supplies and transformers. happy with it for now.

 

[uncola]

Hey guys.. just put together my UcPi, rpi5 and the audiophilediyer r2r nos hat dac.. using a jay's audio 5v 3 Amp linear power supply.. when I plugged in power to the UcPi the LEDs on the UcPi didn't light up.. the manual says on first charge it might take two hours.. is that actually right? Or should I start trying different power supplies and cables? I swapped to a known good usb-c cable, the one I use with my phone and the led didn't light up either so I went back to the other cable.. I'm leaving the UcPi power switch to off until the it fully charges and the LED comes on.. hopefully soon

 

[Ghostship]

Did you see this?
"Note: To working with RaspberryPi 5, have to buy the 6mm M2.5 standoffs. The supplied default standoffs are the 7mm M2.5. "
Yes, it may really take a couple hours for the capacitors to charge.
And, please ensure your power adapter has enough current.

 

[uncola]

thanks for the help, ghostship! Yes I had ian ship me the shorter standoffs with my order. I think I figured out the problem. The Jay's Audio linear power supply doesn't seem to work with either the rpi5 or the UcPi. Weird, because I swear it worked with the rpi4 and the audiophilediyer ad1865 hat dac.
I switched to my ipad charger and it worked. I also verified it works with my oneplus phone charger as a power source, too.

 

[Ghostship]

Yep, the Rpi5 requires a 27W power supply because it needs more current than the rpi4.

 

[dddac]

Rpi 5 with SD Card draws onl 0.5 a 0.7 A. The problem is the PD protocol. See my blog

 

[Ghostship]

The rPi 4 draws about 275 mA on idle. The rPi 5 has a default 600 mA draw, and can automatically increase the current limit up to 1.6A to provide extra power for devices connected to the four USB ports when using the RPi5 27W power supply's Power Delivery (PD) feature that allows the RPi5 to communicate with it and select the most appropriate power profile.

 

[dddac]

I assume most people here use the RPI with a SD card and connect it to the FiFoPi, so only need for big power supply if you add a bunch of USB disks.

 

[Ghostship]

Why limit ourselves to an SD card, when one of the many benefits of the RPi5 is adding an M.2 HAT and NVMe drive and using it as a stand-alone music server?

 

[dddac]

Agree, everyone can do what they want And the RPI5 is very versatile. My response was on your earlier comment which sounded like a factual statement (“because”) and I just wanted to hold against that a little bit. But I think all is said. The RPI does not REQUIRE a 27 Watt supply. I run my RPI5 with a simple 5Watt LM317 supply. all music is on the Roon Server… the RPI is just streaming with Gentooplayer.

• Today at 1:05 PM

Yep, the Rpi5 requires a 27W power supply because it needs more current than the rpi4.

 

[Ghostship]

That wasn't "my" comment, that is the manufacturer's statements in their product manuals.

Anyone experiencing power-related problems with a RPi5 in a stack while powering it the same way they did with the RPi4, needs to consider the fact that the RPi5 requires more current than the previous versions, which is why it comes stock with a 27W power supply.

 

[uncola]

I think it's the PD negotiation that was the issue. my linear supply is 3 amp at 5V so should be sufficient. my phone charger is working great, got all the leds lit up and ian's UcPi supercaps are working great. 👍

 

[AverageNiceGuy]

Power advice for OPA861 I/V #6B,
and
Dual Mono II DAC Hat ES9038Q2M #4B

If I will have
2) UcPure Quad enhanced #41M
and
2) LinearPi MkII/Pro Linear with UcConditioner #26C

Is it better to use
the 2) UcPure Quads on the OPA861
and
the LinearPi MkII/Pro Linear with UcConditioner #26C on the Dual Mono II DAC Hat ES9038Q2M #4B

or vice versa?

https://iancanada.ca/products/linearpi-mkii-ultra-low-noise-smt-linear-power-supply
https://iancanada.ca/products/ucconditionermkii-5v-or-3-3v?variant=48151024075052
https://iancanada.ca/products/ucpure-quad-ultra-low-esr-pure-ultracapacitor-power-supply
https://iancanada.ca/products/48b-p...apacitors-battery-holders-pre-installed-86-00

 

[gizmo3]

monitor pi pro has found its place.
Black or silver.

 

[pkonstantinidis]

@gizmo3 Looks great! Well done.

 

[VMRKarnati]

I managed to power PurePi II with MacBook Pro charger with thunderbolt USB C cable. Phone USB C cable doesn't work.

I think it's the PD negotiation that was the issue. my linear supply is 3 amp at 5V so should be sufficient. my phone charger is working great, got all the leds lit up and ian's UcPi supercaps are working great. 👍

View attachment 1327690

are you able to connect any USB HDD to RPi 5 and use with this power source?

 

[VMRKarnati]

Hi,
I found a solution on this link, it's very simple. It works fine for me, I have no more problems with starting the RPi5
https://forums.raspberrypi.com/viewtopic.php?t=357129

will this support utilizing USB HDD connections to full extent on RPi 5 as well?