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New FIFO buffer for RPI/SBCs

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C

cdsgames

Member
Joined 2015
We designed it to work with any PSU including switching ones. We filter the power plane multiple times for each : analog , digital and oscillators.

Our internal testing was done with our 5V psu...Of course a better PSU will have even less noise/ripple
 
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greinedo

Member
Joined 2016
jonners said:
I have Kali+AK4490 working with Moode 3.1, but I have to resample to 24bit or else I get a blast of noise. I get loud clicks sometimes when engaging 'Play' or 'Pause'.
So I'm wondering, Pistollero/Greinedo, whether you had the 4495 working without these issues? I must say the sound is very good. I'm taking the output through UTC-A20 transformers.

John
Click to expand...



Hi John,

I am glad you have also tried this combo. The sound is very good for me. I suppose you have connected the Master Clock of the Kali to the AK4495, wich may be one reason of the good result.

On my Kali+4495 I also experienced clicks at Play/Pause Stop/start with Moodeaudio 3.1. After some tests, it seems to me that UPnP protocol is the problem.

I installed LMS (Logitech Media Server) on one of my Linux PC + LMS UPnP plugin and activated Squeezelite renderer on Moodeaudio. Now I can choose between UPnP protocol or Squeezelite. Conclusion : LMS with Squeezelite protocol plays very nice on my Kali+AK4495 setup (no clicks, etc) while LMS whith UPnP suffers from those clicks at stream interruptions.

Moreover, I think Squeezelite renderer sound is better. LMS + Squeezelite renderer in Moodeaudio is my current setup. It integrates also a lot of plugins that are important for me like Deezer and Qobuz that Moodeaudio currently does not offer.

LMS.jpg
 
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Dave S

Member
Joined 2003
cdsgames said:
We designed it to work with any PSU including switching ones. We filter the power plane multiple times for each : analog , digital and oscillators.

Our internal testing was done with our 5V psu...Of course a better PSU will have even less noise/ripple
Click to expand...

I have been experimenting with PSs. The KALI/Piano sound is hugely influenced by the supply feeding it. I am surprised this is the case since there seems to be plenty of filtering on board.

The most significant improvement was changing from a toroidal transformer to an EI type. I also recommend using the centre tapped FW rectification method using two diodes, rather than the usual parallel transformer windings and a FW rectifier bridge. The seems to make more difference to the sound that the type of regulator used!
 
sckramer

sckramer

Member
Joined 2010
Sure is an exotic looking film cap on the LT3042 analog side:

And yeah! Finally separate regulator/filter on the clocks (just in general):

This hasssss to more than the Ti/BB PCM51xx deserves ;)

Need to get the drivers open-sourced & in the official linux!

...and interesting overkill supercap--
 

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Greg Stewart

Member
Joined 2003
Paid Member
Boss pics look very good. I'm very curious to hear reports on it. And even more curious to get one to play with.

Love those SMD film caps... see here:

http://www.diyaudio.com/forums/digi...ry-dac-pro-hw-mods-anybody-3.html#post4626613

here:

http://www.diyaudio.com/forums/digi...ry-dac-pro-hw-mods-anybody-2.html#post4617021

(with more details on the overall mods to the HiFiBerry DAC+ Pro here:

http://www.diyaudio.com/forums/digi...ry-dac-pro-hw-mods-anybody-2.html#post4625603 )

And here:

http://www.diyaudio.com/forums/digi...amboberry-ls-my-new-pi-hat-5.html#post4904623

I've seen them used in other commercial gear, specifically the Ayre Acoustics DACs, the K&K Audio RAKK DAC, and the Sony HAP Z1-ES.

Everywhere I've used them I've been rewarded with a sense of sweetness, transparency, and inner instrumental timbres that are beyond what I thought possible for that unit.

Then the Supercap... I first saw that suggested as a useful add-on to DAC power supplies in Joe Rasmussen's thread here:

http://www.diyaudio.com/forums/digi...entations-alternative-post-dac-filtering.html

I haven't tried it yet, but will in a few weeks on a current project. I'm glad the Allo designers tried it and liked it.

One of my more recent projects has me convinced the PCM5122 has a lot more potential than most realize. I duplicated my 14-linear supply generic digital setup for my 2nd system. 7 of the supplies are used for the LMS-computer and the various networking components, with the rest available for various DAC setups using from 2 to all 9 source/DAC supplies.

The DAC supplies are a bit better than my first iteration, using higher-current toroids and the 2-diode FW rectification scheme mentioned by Dave above.

Currently I running the modified HiFiBerry DAC+ Pro shown in the first link above, replacing the modified Sony HAP Z1-ES in that system... I described the mods to the Sony here:

http://www.diyaudio.com/forums/digi...1es-hi-res-source-new-2014-a.html#post4440620

and here:

http://www.diyaudio.com/forums/digi...1es-hi-res-source-new-2014-a.html#post4443476

With the setup's AC-powered supplies and the HFBD+P in slave mode on a well-powered Allo.com Kali, it edges out the modified Sony. BUT using 3 Uptone Audio LPS-1 floating Ultracap supplies to power the Kali and the digital and analog sides of the PCM5122 pushes the modified-beyond-recognition lowly PCM5122-based $45 retail HFBD+P decisively above the modified Sony and 2nd only to my two Soekris setups.

I never thought this lowly DAC with the down-market PCM5122 could sound so good!

So I have HIGH HOPES AND EXPECTATIONS for the BOSS!

Greg in Mississippi
 
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