Hifiberry DAC+ Pro - HW mods anybody?

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#381
I can upload a sketch of the circuit diagram in due course but it is a "work in progress".

A 5v supply feeds the onboard 3.3v regulator on the original Hifiberry RCA board fitted to a RPi Model A. This 5 volts is from a heavily modified ALWSR super regulator board. It is similar to the Jung Super Regulator but with a PNP follower on the output of the Opamp. It has a tracking pre regulator. Further upstream of this is a 55v R core, 80 henries of choke regulation and a very basic shunt regulator based on a MOSFEt current source and an amplified zener regulator.

The 3.3 volts from this only feeds the CPVDD on the PCM5102 now.

I have a similar setup feeding 3.3v directly to the DVDD supply input.

The AVDD is fed 3.3v from a separate TPS7A4700. I have cut the feed from the onboard 3.3v and feed directly to the cap at the PCM5102. This supply is currently fed by from an isolated battery supply.

The negative 3.3 volts replacing the charge pump feed is the same as the AVDD feed from a separate battery supply but with polarity reversed. I intend to replace all these TPS7A4700 feeds with ALWSR feeds and use remote sense. The noise is significantly lower from Jung style regulators but you have to be careful with the loading to avoid a noise peak due to output inductance and the local bypass caps.

I think you need the drawing!

John
 
#383
soundcheck said:
Again. Just have a look at the iFi iPower.

Not sure why audio people stick to old-school stuff forever.

It's not just me who figured that the iPower puts numerous analog supplies to shame.

Enjoy.
Click to expand...

Do they have a non wall-wart version? Their flowery language always made me move along... was like ehhh, its just a SMPS with 10 caps on the output 😀

Besides, the LT3042 isn't exactly old tech.
 
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#385
Just to let u know:

The new MamboBerry LS is out.

It's a stripped down version of MB DAC+ offered at 55€.

The layout looks similar on the first glance.
Some caps were obviously taken out. Since the introduction of Audiophonics I-Sabre V3 its been clear that these caps were overkill anyhow.


If - as announced - the soundquality stays at the same level as the old one,
the new DAC should be preferable over stock Audiophonics or HifiBerry devices.

The nice thing is that the new DAC runs with external 5V AC/DC instead of 6V now.

The problem I have with this new device is, that all of us having this or that (modified) HAT-DAC in place, probably won't feel tempted to go for it, even at 55€ only.
That might change if someone would tell us that the new DAC sounds better than the old one. 😀
Or we just wait for the "MamboBerry DAC+ V2". I hope they start working on it sooner or later. 😉

Enjoy.
 
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#386
sckramer said:
Do they have a non wall-wart version?
Click to expand...

Nope. I'd say just remove the case.
I also feel kind of tempted to do that and to cut the cable on the DC side.
Obviously then you'd require a longer mains cable.

Here we go again. What's the better compromise??

##

Let's not discuss iFi marketing. 🙄 iFi is addressing the mass market. That requires a different language.
I talk to Thorsten Loesch from time to time in private. Let's say it feels like talking to you guys.
 
#394
Pircoreplayer 3.0

Hi,

just saw this this evening and tried to update to the latest 3.0 without removing SD card. It went through but Squeezelite cannot starts.. after few mins trying to figure out.. apparently if I change back to Analog audio and Squeezelite can run. When select Hifiberry Dac+ it fails to start again.

Anyone knows how to get this working?

regards,


ck
 
#395
clivem said:
@sc, before you ask.... I haven't had time to update that "simple" branch. You can still grab the 384k patch set in isolation, which will apply to latest rpi-4.4.y. (I've given up trying to get it included by default in RPi kernel.)

384k support patch
Click to expand...

Thx. It's bookmarked. 😉

######

I started another mess-around-with-HifiBerry round and never finished it.

For the time being I switched back to my JLSounds/PCM5102/iPurifier combo
and my own Arch installation with up2date PI kernel.
I actually tried 8x upsampling on the LMS server and stayed with it.
I do think it's a viable option for this DAC.

custom-convert.conf
Code: 
flc flc * *
   # F
   [sox] -D -q -t flac $FILE$ -t flac -e signed  -C 0 -b 24 - rate -v -s -L 352800 2>/tmp/sox.log


Beside that I'll get a new MamboBerry Lite for testing soon. It supposedly slightly betters
the old one. I'll see and let you know.
 
#396
samcklee said:
Hi,

just saw this this evening and tried to update to the latest 3.0 without removing SD card. It went through but Squeezelite cannot starts.. after few mins trying to figure out.. apparently if I change back to Analog audio and Squeezelite can run. When select Hifiberry Dac+ it fails to start again.

Anyone knows how to get this working?

regards,


ck
Click to expand...

Did you try other settings like: HifiBerry/Sabre/ ES9023/TI PCM5102A

I tried mine with generic I2S to feed Ians FIFO II and that works flawless.
Will try other dac with HifiBerry DAC+Pro this weekend (I2S out only)

Regards,
Alex
 
#397
Abartels1965 said:
Did you try other settings like: HifiBerry/Sabre/ ES9023/TI PCM5102A

I tried mine with generic I2S to feed Ians FIFO II and that works flawless.
Will try other dac with HifiBerry DAC+Pro this weekend (I2S out only)

Regards,
Alex
Click to expand...

Yes, I tried to select generic i2s even with the Hifiberry pro board still attached to the Pi the Squeezelite managed to starts.. only when I select the Hifiberry dac+ driver it cannot starts.

I took another pi3 and a stock new Dac+ pro board and download the img manually and write the image into the SD but the Dac+ pro driver still not working. Seems like something wrong with this release.

ck
 
#398
samcklee said:
Yes, I tried to select generic i2s even with the Hifiberry pro board still attached to the Pi the Squeezelite managed to starts.. only when I select the Hifiberry dac+ driver it cannot starts.

I took another pi3 and a stock new Dac+ pro board and download the img manually and write the image into the SD but the Dac+ pro driver still not working. Seems like something wrong with this release.

ck
Click to expand...

Hi, i didn't meant the generic driver to test but the one especially designed for
HifiBerry which works with ESS ES9023 and TI PCM5102A:

HifiBerry/Sabre/ ES9023/TI PCM5102A

Can you test the above driver?

HifiBerry DAC+ Pro has PCM5102 on board, so this probably is the driver to use!
 
#399
Abartels1965 said:
HifiBerry DAC+ Pro has PCM5102 on board, so this probably is the driver to use!
Click to expand...

Eh?????

HB DAC+ Pro uses PCM5122, I2C (software) connected, and you should use dtoverlay=hifiberry-dacplus for overlay in config.txt, which will result in use of
hifiberry_dacplus machine driver and pcm512x codec driver.

For original HB DAC (1st generation PiB model using PCM5102), and HB ES9023 board (and other ES9023 boards), use dtoverlay=hifiberry-dac in config.txt, resulting in the use of hifiberry_dac machine driver and pcm5102a codec driver.
 
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