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Gieseler Audio

Raspberry Pi Klein combo interest

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AFAIK the AK4490 needs a seperate MCK input. The S/PDIF receiver (Wolfson WM8804) & Amanero Asynchronous USB board I use in my DAC both have MCK outputs which connect to the MCK input pin on the AK4490.

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Compute model actually makes things bigger when it's implemented. It's designed for multiple processor computing not for small size

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Hi Guys,

well a few months ago I built a new prototype streamer DAC combo based on a Raspberry Pi.

All AKM DAC's run in slave mode & so it is not possible to connect the Raspberry PI  directly into the DAC chip.

To get around this I used a device called the Kali reclocker.

https://allo.com/sparky/kali-reclocker.html

This reclocks all the I2S lines & included a high quality master clock output - perfect to drive the AK4495 DAC chip I used.

I tried quite a few distros on the Pi & settled on moOde audio as it sounded the best, easy install & excellent support.

I loved the sound quality but there were two issues.

An intermittent loud click on pause/track change & I was not totally wrapt in the simple web based remote system.

Tim from moOde audio was very helpful regarding the clicks but we never managed to solve the issue & put it down to the hardware.

I put it aside for a few months but I still had a  gut feeling that different software may solve the loud click issue.

I kept reading good things about Picoreplayer so today I gave that a shot.

Success!

It is considerably more involved in the setup but well worth the effort.

All clicks have virtually disappeared & the odd one that occur are so faint they are barley noticeably.

The other huge bonus is I can use iPeng to control it. This app is way more slick than any simple web base style of interface.

http://penguinlovesmusic.de/ipeng-8/

Any compatibility Logitech Squeezebox app will work so plenty of Android solutions as well.

 

My hardware setup.

I'm using the AK4495 in a relatively simple setup with a transformer output stage similar to the Groß DAC.

Nice low noise PSU's all round with a dedicated high current one for the Kali/Pi section.

Simple muting so no switch on/off pops.

Why did I pick the AK4495 - I particularly like the sound of it, easy to implement & reasonable cost.IMG_1228.thumb.JPG.c8e924c61fe90549752724718c0e37f4.JPG

At this stage I'm not quite sure on how I will market/price it. The SD card is hard to get to so I will probably need to run that to a external socket.

Anyway lots of possibilities & potential for sure!

I better get back to Groß DAC production for now or I will have unhappy customers.

Stay tuned!

 

 

    

 

 

 

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5 hours ago, Gieseler Audio said:

...

I kept reading good things about Picoreplayer so today I gave that a shot.

Success!

It is considerably more involved in the setup but well worth the effort.

 

You might be interested to know that @Greg Erskine is one of the amazing devs of pCP ;)

The pCP team are super active and adding new features "a lot"

Did you try the "audio" version? And have you seen the experimental bluetooth support is being played with?

 

 

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Yes Greg seems a great guy & very regular with updates & info even here on SNA.

I did go for the “audio version” & it is sounding extreamly good.

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FWIW Clay  I am extremely interested in this!!!

 

I know you probably have a lot on your plate  ATM but if you can make this happen.......

 

This is a great idea for a product.   

Edited by Jeddie

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Well I’ve been running this for a couple of days now & it's rock solid - not one glitch or pop.

I’m controlling it with iPeng 9 running on a thirteen inch iPad Pro & have to say it is a lovely interface.

iPeng have just done another update which includes Roon playback support.

http://penguinlovesmusic.de/2017/07/13/summer-news-from-ipeng/

My streamer/DAC is running (balanced or RCA options) directly into  power amp & has plenty of drive level.

The AK4495 analogue section is runing on 7v so max output is up a bit at around 3v rms.

Softwareware volume control in iPeng - very solid & reliable.

Music sources I’ve been using;

Tidal (flac)

USB stick with hi Rez music files

Streaming radio - I’m amazed just how good this sounds too.

Artwork support is excellent & not one album cover missing in any of my music sources.

I’m getting very excited about this now as you may have noticed.

After two beers last night & looking across at my Hi-Fi rack I’m thinking - this little box can replace my Konverter + Auralic Aries combo & is about a quarter the cost. Sound quality is obviously down a bit but still extremely good.

I will probably do two versions of it.

An entry level one similar to photo above & a ultra version more like the Groß DAC.

Now there is just one limitation in that the Kali reclocker I use (& need) does not support DSD.

There are more complex & expensive reclockers out there that support DSD but I will need to do more R & D to see if any are suitable. 

Stay tuned!

 

 

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