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

[M_Balou]

Hi grizaudio,

As far as i know the charging current is limited to 1A.
And yes, the conditionerPi needs to be precharged.
And imo it works best when the rpi is left always on.

Did you reed the manual?
You can find it on Ian‘s gitHub

 

[fabflix]

Finished yesterday evening building my Ian Canada stack.

It goes like this: RPI 4 on top of StationPi -> FifoPI Q3 w/Accusilicon AS318 -> ReclockPi -> HDMIPI MKII, signal path is being fed by 2 x LinearPi and the RPI is powered by a Samsung phone charger. In the near future I plan to add 2 x UcConditioner for the LinearPis. OS is symphonic-mpd.

Now comes the question for more experienced folks: is it worth (audio wise) to power RPI using another LinearPi (or other LPSU)?

Here are some pics: 😀

 

[Supersurfer]

Yes, even with a fifopi as barrier there is still a benefit in using a linear ps on the rpi.

 

[dddac]

@Stefan,

did I miss a review from you of the sinePI, or did you not post yet ?

 

[drone]

I created a YouTube video of my complete Streamer with LCD display in a Beautiful Case. It can help give some people ideas as there is hardly any videos about this .
here is the link:
Amazing audiophile DIY music streamer for a dac, and how to build your own - YouTube

Hi,
thank you for this nice video. Maybe I missed the information. But how do you power the whole thing before the batteries?

BR
Branko

 

[wlowes]

Now comes the question for more experienced folks: is it worth (audio wise) to power RPI using another LinearPi (or other LPSU)?

Agree with Supersurfer. I think that you can easily get away with diy linear ps here. I used simple Bridge/CRC/7805 supply from scraps in the parts bin. Supply required watts. IMHO, save the more exotic supplies for ReclockPi etc.

 

[fabflix]

Thanks for the replies @Supersurfer and @wlowes.
I have a 5v AMB Sigma 11 PSU lying in my drawer, will use that to power the RPI.

 

[Supersurfer]

@Stefan,

did I miss a review from you of the sinePI, or did you not post yet ?

No you did not miss it. I have been pretty with tuning my dac and loudspeakers. I made so many changes that it is difficult to grasp the small changes of the squarer in between.
I am using a new self build field coil tweeter and am building and tuning a power supply for it. Tuning into the sweet spot voltage of the field coil takes some time and sound changes are quite big.
And this together with a new iteration of my balanced TDA1541A dac.
The sound is changed dramatically and luckily in a very positive way 😉

When everything is settled and I am used to the sound profile I wil do a side by side comparison of the squarers.

 

[iancanada]

Trying to get the most out of TWTMC clocks for FifoPi (12)

Looking for the best power supply for TWTMC DRIXO

TWTMC DIRXO SC-cut oscillator needs a perfect power supply to achieve the best possible low phase noise performance. Three solutions were tested good by myself.:

1. UcPure 15V in configuration
2. LifePO4 battery power supply 13.2V output
3. Two LifePO4 Mini 6.6V in serial (13.2V in total)

No doubt, the UcPure 15V is the best solution. I’m really happy with the UcPure 15V and use it every day in my system for my DRIXOs. However, an ultracapacitor pack with six 3000F ultracapacitors could be a bit expensive.

LifePO4 power supply and the 2 * LifePO4 Mini 6.6V has no difference in sound quality. But the LifePO4 Mini 6.6V solution could be less expensive.

I do not recommend any active power supply or low noise LDO for DRIXO. Because the performance of clock oscillator circuits are very sensitive to the flicker noise or 1/f noise of the power supplies. Pure passive power supply could be a much better solution for clock oscillators.

Other links of this topic
1.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-657.html#post6668751
2.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-660.html#post6671042
3.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-662.html#post6675622
4.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-664.html#post6678025
5.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-673.html#post6686256
6.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-677.html#post6690153
7.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-682.html#post6704886
8.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-687.html#post6718041
9.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-694.html#post6741950
10.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-710.html#post6756214
11.https://www.diyaudio.com/forums/dig...mate-weapon-fight-jitter-714.html#post6764589

Ian

 

[A123]

Amazing passive power options. It helps to plan for the long-term as I'm allergic to any type of Mains power.

I'm not ready to scale yet since I haven't even gotten things working, but it's something I look forward to pursuing.

I never thought I could power my USB optical cable with anything more than a standard 5V battery pack. Now it's LiFePO4 battery-powered w/ Super Caps.

These solutions completely re-shape this hobby for my use cases.

 

[sebbyp]

+1 on Passive power options. I see my digital front-end getting more and more expensive - every time Ian releases something new!

Does anyone have a good source for the 3000F caps in EU or UK? I cannot find them in the usual places.

 

[iancanada]

Under this worldwide IC shortage situation, sourcing DIY parts becomes a problem.

Just found some 3000F ultracapacitor packs here:

Original MAXWELL Super capacitor 16v 500f car bettery bank 6* 2.7v 3000 farad ultracapacitor For motor starting|Tool Parts| - AliExpress

Ian

 

[Markw4]

...the performance of clock oscillator circuits are very sensitive to the flicker noise or 1/f noise of the power supplies.

Hi Ian,

Very interesting comment, thank you. May I ask how you determined the issue was specifically flicker noise, say, as verses other noise on the AC line coupling through into sensitive circuitry? Was it a process of elimination, or was DC power rail flicker noise found to be directly correlated with oscillator performance?

 

[sebbyp]

Under this worldwide IC shortage situation, sourcing DIY parts becomes a problem.

Just found some 3000F ultracapacitor packs here:

Original MAXWELL Super capacitor 16v 500f car bettery bank 6* 2.7v 3000 farad ultracapacitor For motor starting|Tool Parts| - AliExpress

Ian

Cheers Ian.

 

[iancanada]

@ sebbyp

Or, Mouser stock
https://www.mouser.ca/ProductDetail/Coiltronics-Eaton/XL60-2R7308T-R?qs=Sd2AGZv2AHmr8s4Arrqy2g==

Ian

 

[67339]

Hello,
I would only buy these products from companies like Mouser.
Doede also run into trouble using supercaps from questionable sources.
Eaton seems to be a good brand!
Greetings,Eduard

 

[AirAir]

@ iancanada
Thanks Ian for the manual to UcPure, I'm looking forward to the LifePo4 mini.
And i want to ask if it is possible to get AES3-1997 from TransportPi? (I have two boards).

And be careful with 3000F
Maxwell 3000F superconductors short circuit !!! ???????? ????????? ????????????? ???????? 3000F!!! - YouTube

 

[iancanada]

@AirAir

You can try a RCA to XLR adapter to work with AES devices.

Regards,
Ian

 

[AirAir]

Thanks, I understand 🙂
I watched the datasheet on AK4104, it seemed that theoretically it was possible.

 

[kunlun121]

Hello,
I would only buy these products from companies like Mouser.
Doede also run into trouble using supercaps from questionable sources.
Eaton seems to be a good brand!
Greetings,Eduard

+1

The product page at Mouser says that Maxwell discontinued the BCAP3000 ultracaps in February 2020. There is even a "product discontinuation notice" that you can download at the product page at Mouser.

Could this be connected to Tesla taking over Maxwell in 2019? Then last summer Tesla sold Maxwell's ultra capacitor business back to Maxwell execs. Turns out Tesla was never interested in Maxwell's ultra capacitors, but some battery tech that Maxwell owned. Was Tesla not interested in Maxwell's ultra capacitor business and did they simply shut it down?

So. Maxwell may start selling ultracaps again in the near future. But if so, how soon? All we know with some degree of certainty is that Maxwell has probably ceased its production of ultra caps by early or mid 2020.

What do you think you will get when you buy these 'Maxwell' Ultracapacitors packs off AliExpress or Alibaba? May be the real thing. (New old stock?) More likely on Ebay than on AliExpress. But it may be something different. May be a factory in China that used to produce Maxwell products doing a little over time. Wouldn't be the first time that happened with a branded product that's manufactured in China.

Is there any risk in that? What would it look like to find out that there is?

On the other hand, I'm not so tech savvy, so buying an assembled pack is attractive for me. But I agree with Eduard that Easton looks like a decent company. That would mean I'd have to assembly my own pack. Source my own balancing boards. Which ones, where? Some "super cap straps". How hard can it be? (By the way, @AirAir, great video about shorting six BCAP3000s...)