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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
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Old 2nd March 2020, 12:52 PM   #1291
misterdog is offline misterdog  United Kingdom
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Join Date: Dec 2011
Location: Sheffield
Added an Allo Shanti LPSU and swapped out the Rasp.Pi4 for an Allo USBridge Sig to my FIFO and DAC stack.

Cleans up the Pi noise nicely.

Allo claim 0.08 uV noise from the LPSU , 2x 3F supercaps on the output.
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Old 2nd March 2020, 02:55 PM   #1292
ernesternest is offline ernesternest  Europe
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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
Would be happy about AK449X and AK4137 on one board in sync mode :-)
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Old 7th March 2020, 12:48 PM   #1293
sebbyp is offline sebbyp  United Kingdom
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Quote:
Originally Posted by misterdog View Post
Added an Allo Shanti LPSU and swapped out the Rasp.Pi4 for an Allo USBridge Sig to my FIFO and DAC stack.

Cleans up the Pi noise nicely.

Allo claim 0.08 uV noise from the LPSU , 2x 3F supercaps on the output.
Thanks for the feedback. Validates what I have been hearing too.

Edit: I think the best result I have had so far with the USBsig is using a USB to I2s board.
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Old 7th March 2020, 03:06 PM   #1294
jimk04 is offline jimk04  United Kingdom
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Default DC on the output

Hi all.

You may or may not recall I was building another DAC for my brother to go in his fairly costly (commercial) system. He has a high end vinyl front end and he fancied a streamer to save his cartridge.

Well it has been in place for a couple of weeks now and he is very pleased.

I am on house sitting duty as he is away for this evening so I tried the system just now. Sounding good...crank the volume a bit.....the dac is set to full level 0db so I am using the remote for his amp (relay volume control).
As the levels get higher I notice some clicks when the volume relays switch....hhhmmm....I have heard this before when I got my Salas DCG3 wrong......well soon enough I have this expensive amp shutting down. Fortunately it has DC speaker protection built in!

So long story short...how do I test for DC out of the XLRs? And what would be the first culprit?
This is running one of the giveaway untested IV std stages Ian kindly gave away. It was indeed problematic on delivery and I had the fortune of receiving the kind help of Simon sq225917 to sort it.

Any advice much appreciated.

Thanks
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Old 8th March 2020, 07:58 AM   #1295
nielsek is online now nielsek
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Default ES9028Q2M without ESScontroller

Iíd like to test following Ianís equipment together. Should it work?
  1. Odroid C1+ as a source with IsolatorPi and DOP Decoder v1
  2. u.fl connections from IsolatorPi to McFifo/McDualXO
  3. u.fl connections from McDualXO to ES9028Q2MDacHAT using RpiI2SAdapter (mounted on topp of DAC)
I have all of them, but lacking dedicated ESScontroller for this setup, but could borrow one for setting things up (from my primary gear). Should it work or I need a dedicated ESScontroller?
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Old 8th March 2020, 09:31 AM   #1296
androa76 is offline androa76  Slovenia
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Jimk04
Why do you use 20cm of Ribbon cable? Why don*t you stack dac on the top of a Fifopi?
Output stage is not so problematic and can be on side.
For dc measure in mV voltage from gnd to POS and NEG pin. It depends of opamps. More than few mv will for sure cause clicks on power amp at high volume.
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Old 8th March 2020, 01:07 PM   #1297
jimk04 is offline jimk04  United Kingdom
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Hi Androa.

I had read of some trying the dac away from the rest of the stack to minimise noise/RFI from the Pi? And it also 'flattens the build to allow lower chassis. I may well try it back on top of Fifo as I think this build will end up Pi less.

So I'm looking into the +/- psu and opamps for the DC issue.?

Thanks for your help
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Old 9th March 2020, 10:38 AM   #1298
bsk is offline bsk  United States
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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
Ian,

Have you had a chance to experiment with the Newclassd Neutron Star 2 clock? I see that JackLee has found that two of these clocks installed with FifoPi interfere with each other.

I am quite interested in using the NS2 clocks. I can certainly hear a difference from NDK to Crystek to Accusilicon and would like to try the NS2.

Thanks.
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Old 9th March 2020, 11:33 AM   #1299
Crom is offline Crom  United Kingdom
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Join Date: Oct 2012
Quote:
Originally Posted by sebbyp View Post
I have seen that Dac.

I am not sure a dual-mono build is required for the 4499, but a pretty good value board all the less

I'd be happy either for a single or dual-mono board from Ian.



I'd also be interested. I haven't done much digging around the different versions of this chip (so I may be arguing a moot point) but I'd be even more interested if Ian selected the non-mobile version of the chip.

Last edited by Crom; 9th March 2020 at 11:40 AM.
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Old 9th March 2020, 08:19 PM   #1300
nielsek is online now nielsek
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Default NDK2520XOadapterKIT with NZ2520SDA

I today tried to solder clocks on NDK2520XOadapterKIT. Ordered NDK NZ2520SDA 24.576MHz & 22.5792Mhz from DIYINHK.
First I tried with hot air gun from the other side of adapter, but this didn't work, as probably the pcb is too thick and I didn't want to apply too much heat.
I then tried heating the four pads one by one, using solder paste. It worked well.
Unfortunately I could'nt get eiter of them working when installed on FifoPi.
Might it be that I damaged the clocks with soldering iron (too much heat)? I have soldered NDK clocks before with same technique.
Would really appreciate hints, how you have managed to solder them on the new adapters. Here's a photo also.
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