If anyone wants to try a software approach to slew rate opamp stress and US hash on their Miro DAC, both foobar and PGGB (up to 2million taps!) are free.
https://www.remastero.com/foo-pggb-rt-guide.html
It would be really interesting to get feedback if the theory works out on these NOS DACs. Thanks.
https://www.remastero.com/foo-pggb-rt-guide.html
It would be really interesting to get feedback if the theory works out on these NOS DACs. Thanks.
Hello All,
Happy to report another AD1862 live and operational! But I have 2 issues I hope the forum can help with, both relating to noise:
My current setup: RPi (Roon) -> JLSounds I2SoverUSB v.III -> Miro's AD1862 -> Purifi Amp. JL Sounds output side gets 5V from PSU1 and was working in this configuration with another DAC with no problems.
Issue 1: I get some scratches and pops with the USB cable connected. Disconnected it is silent. Have tried other cables, power routing for RPi, etc to no avail. Noise level is not too bad but I like my hifi quiet when not playing music...
Issue 2: When music first starts after a power cycle of the DAC there is a loud single pop. Only occurs after power cycling the DAC and only when music is first played.
The same RPi/JLSounds combo was playing successfully through another DAC without the above problems. I've played around with board grounding with no effect.
Any help on the above would be appreciated. Once playing - it sounds great!
Thanks in advance,
Mike
Happy to report another AD1862 live and operational! But I have 2 issues I hope the forum can help with, both relating to noise:
My current setup: RPi (Roon) -> JLSounds I2SoverUSB v.III -> Miro's AD1862 -> Purifi Amp. JL Sounds output side gets 5V from PSU1 and was working in this configuration with another DAC with no problems.
Issue 1: I get some scratches and pops with the USB cable connected. Disconnected it is silent. Have tried other cables, power routing for RPi, etc to no avail. Noise level is not too bad but I like my hifi quiet when not playing music...
Issue 2: When music first starts after a power cycle of the DAC there is a loud single pop. Only occurs after power cycling the DAC and only when music is first played.
The same RPi/JLSounds combo was playing successfully through another DAC without the above problems. I've played around with board grounding with no effect.
Any help on the above would be appreciated. Once playing - it sounds great!
Thanks in advance,
Mike
Thanks for the hints
Issue 1 might be better - difficult to tell
Issue 2 does not occur with Laptop USB input
What could I do to remedy the RPi USB connection? I don't get the issue with a commercial USB DAC.
Just keep testing one thing at a time. Roon can cause issues. Try a different Pi audio system first. The main thing is its not your DAC. If you run into more issues maybe try a Pi forum?
the usb card should see from the source an I2S signal. Also the material must stay or equal at max 20/192 kHz or clicks may occurs sometime.
I do not know Roon but I 'd look for if there is a setup that not oversampling the files or if there is a choice of I2S option or pilot and at lasd if the endpoint is Roon compatible. May worth to try pc section in diya if not enough to solve your problem.
I do not know Roon but I 'd look for if there is a setup that not oversampling the files or if there is a choice of I2S option or pilot and at lasd if the endpoint is Roon compatible. May worth to try pc section in diya if not enough to solve your problem.
I thought that might be it. Roon can set max sample rate and bit depth which I tried at 16/44 but same behavior. I'll keep tinkering.
Appreciate the help!
Best,
Mike
The second number is more important. With the first it mays be ok at 24. The extra bits will be see as zero but this is sometimes the pcu of the renderer thas has problem to make it all, default buffer size experienced as cuts in the playback...though with modern Rpi power is not a problem for just the endpoint streamer.
By the way, figure 54 in the AD797 DS that Richard mentioned, coincidently shows an application diagram of a AD1862 DAC I/V converter - including a 2000pF pre-filter.
Mike,
btw I made a mistake as I had something else in mind. The Rpi as an usb stremer through the JLSounds will not send an I2S as it is the JLSounds that convert the pcm flux in I2S readable by the dac board. Be also sure as there are several setups than the JLsounds card as the good option about its I2S output. There is a shortcuct link about that in the blog main page from Mir01360, see first post of that thread. If ok, then see if the Rpi Roon endpoint do not receive oversampled from the main Roon pc database host. Sorry for the confusion above
btw I made a mistake as I had something else in mind. The Rpi as an usb stremer through the JLSounds will not send an I2S as it is the JLSounds that convert the pcm flux in I2S readable by the dac board. Be also sure as there are several setups than the JLsounds card as the good option about its I2S output. There is a shortcuct link about that in the blog main page from Mir01360, see first post of that thread. If ok, then see if the Rpi Roon endpoint do not receive oversampled from the main Roon pc database host. Sorry for the confusion above
Confusion is all mine it seems. I'm running V1.3 DAC board (including registers) not the JLSounds stack. I found and read Post 617 but may have misunderstood. I followed Miro's advice in that post including configuration of JLS jumpers. But now on reflection I need to follow Post 2225 including R1 on JLS H1. Have I got that right?
Best,
Mike
What are your thoughts on caps in psu2? I love nichicon uhw caps for filtering, amazing little buggers. They are high ripple and really low esr. Now, there are other contenders that scratch my hand for ordering, which are tdk b41505 6800uf 35v one, nichicon lkg 6800uf 35v, which have worse ripple and esr, but people seem to like them in psu.
Thanks Ripster - I do have the v.iii I2SoverUSB board. The upper configuration in your response I am running now, but that is different from what Miro suggests and is confirmed to work with the v.iii board (albiet with V1.3 of the DAC) in post 2225. What I am missing is R1 so I will give that a try first.
I have been experimenting with RPi/XMOS/Amanero lately with three different type of DACs AD1862/AD1865/ES9038Pro.
You have not mentioned what OS you are using with your RPi. I have used Raspian, Volumio, Moode, LibreElec and OSMC. Personally I prefer the last two as RPi OS, as both of them give me more flexibility to use RPi not only as an audio player but a fully functional powerful media center.
There may be drivers issue if you are using the first three OS. Secondly I suggest you should try connecting the USB interface to RPi before powering up anything. XMOS should ideally be powered by RPi.
But if you still get audio issues then the most likely candidate are the Alsa-USB drivers. There is no problem in OSMC and LibreElec.
P.S Coming weekend I will experiment driving the DAC directly with the RPi, through its own I2S interface, requires some config editing via ssh terminal., I'll post my findings later.
The setup which you are referring to is if you do not have shift registers! So you need to answer all other questions... I am running this setup you are referring to but I do not use shift registers! I have ROON server, raspberry 4 ROON bridge connected to i2soverusb board... The only problems with noise i ever had was from i2s cable connecting i2soverusb to miro dac when I was using older board with shift registers. If I moved the cable while playing it would be even worse! But to help you, we would need to know all about your setup as asked in previous posts.
OK. All the details of my current setup (please forgive me as I am still learning what is relevant and what not)
Roon ROCK Server via Roon bridge (RAAT) to RPi running RoPieee as Roon Endpoint
USB from RPi to JLSounds USBoverI2Sv.iii configured for AK4490 (B1 and B3 jumped, no R1)
JLSounds USB side powered by USB, Output side powered by 5V from Miro PSU1.
Miro PCB V1.3 DAC AD1862 shift registers installed and LM6171 OpAmps
PSU1 powering DAC and output side of JLSounds card
Issues (from first post)
1. Some scratchy noise at idle
2. Single loud pop when music starts playing first after power up of DAC (only after power cycle)
All of the above (not including the DAC) had been previously running without issues driving an AK4493 DAC (via I2S).
More specific I cannot be
Again: thanks for the help.
Mike
So try wiggling i2s cable that goes from i2soverusb pcb to dac pcb. What version is RPi?... Then inside the roon app is the jlsound recognised? And what settings do you have for playback in roon for jlsounds DSD or DSD to PCM and what sample rate? And maybe try changing the USB cable...OK. All the details of my current setup (please forgive me as I am still learning what is relevant and what not)
Roon ROCK Server via Roon bridge (RAAT) to RPi running RoPieee as Roon Endpoint
USB from RPi to JLSounds USBoverI2Sv.iii configured for AK4490 (B1 and B3 jumped, no R1)
JLSounds USB side powered by USB, Output side powered by 5V from Miro PSU1.
Miro PCB V1.3 DAC AD1862 shift registers installed and LM6171 OpAmps
PSU1 powering DAC and output side of JLSounds card
Issues (from first post)
1. Some scratchy noise at idle
2. Single loud pop when music starts playing first after power up of DAC (only after power cycle)
All of the above (not including the DAC) had been previously running without issues driving an AK4493 DAC (via I2S).
More specific I cannot be
Again: thanks for the help.
Mike