Raspberry Zero W V1.1 + Volumio / I2S-connection + Dietpi-Update V6.12

so, 😉
its a little bit silent here lately but it doesn´t matter->here some infos about a Raspberry Zero W V1.1..
because they´ve updated the Arduino-ESP32-core here on github->https://github.com/espressif/arduino-esp32, and my self-made-noob-sketch didnt work since then on my Doit-ESP32S-V1 anymore, i thought also about to use my raspberry zero W V1.1 to control the ES9038Q2M via web or BT (for the I2C-control of the Digipoti MCP4131 for example, or the relais-control for the different-filter-settings and so on..)
for this (on a raspberry) „Node Red“ (a programming language/editor) looks like a very good attempt/approach..post maybe then a little bit more..
anyway first i have to get the zero to work with any of these chinese-ess90xx-boards..
I´ve ordered the zero w without a pre-soldered header and without a „hammer header“; u can get them so at pimoroni for example of about 13,50€ !! (incl.shipping)->https://shop.pimoroni.de/products/raspberry-pi-zero-w
(u can also get there a raspberry zero (without wlan) for 5,05€ !! (+3,50€ shipping)->https://shop.pimoroni.de/products/raspberry-pi-zero

but this self-soldering is IMO on this little raspberry a bit more complicated than normal, it was difficult to get an I2S-DAC-board on this to work..
heres again a little picture how to connect the I2S-lines: (the pin-layout on my zero w V1.1 is exactly the same as before (on a RPI3B for example) (because someone said there are different pin-layouts on different zero´s)

so, i have to use Volumio first to check out where the problem was (the soldering 😉 ), and i took the fresh 2.413 (https://volumio.org/get-started/)..
works absolutely fantastic here now with an ES9028Q2M (+Muses8920); almost no horrible pops+clicks at changing volume/tracks/audio-formats..
I use here now the „hifiberry-dac“ settings; the „RPI-DAC“ settings are working too (but be careful while using the hifiberry-dac settings->u have to set the target-bitrate to „24bit“(audio resampling on); else u get a horrible noise (but this was clear if u have followed this blog/read a little)..


as said, fantastic here now (i´ve originally wanted to use my old ES9023 for this; but got no sound at all (was this soldering problem 😉 )..
and by that u can use the raspberry zero W V1.1 also with a normal usb-cable on a normal usb2.0-port (500mA)..for me here its enough; hadnt to use the original Pi-power supply (2,5A or something)..
also, Dietpi is now at V6.12 and i still want to buy some green ES9038Q2M V1.07 and some OPA627 😉
greets for now 😉

„allo-katana-dac-audio.dtbo“ available now in DietPi V6.10

so, 😉
the „allo-katana-dac-audio.dtbo“ is now available in DietPi V6.10; means u can select „“allo-katana-dac-audio“ in DietPi->DietPi-config->Audio..
i´ve tested it here with a „Blue“ ES9038Q2M->no success/sound..
(i use the „i-sabre-k2m“.dtbo in DietPi->works very well with the ES9038Q2M here.)

was to be expected because (as earlier posted) the .dtbo adresses the mcu on the katana-board and apparently not on our cheap and lovely chinese 9038Q2M-boards..
else nothing particular new, except i really want to test some „OPA627“ (the „Bugatti Veyron“ under the OP-AMPs) and want to buy some new, green ES9038Q2M V1.07 ..
greets from here !! 😉

SRCs TI 4192 + AK4137 / Volumio-update / foo_out_asio foobar2000-component

so, 😉
as said, „we“ have to improve the input-quality (to an ES9038Q2M par example) jitter+dynamic-range/SNR-wise->“Dynamic range: 144 dB (-60dBFS input, BW = 20Hz to FS/2, A weight),THD + N: -140dB (0dBFS relative input, BW = 20Hz to FS/2) (excerpt datasheet Ti SRC4392) over I2S (directly to the ESS-chips) from spdif or USB..
Markw4“ at my praised diyaudio.com-forum (Link), has posted some beautiful pictures about it (hope i can use them here too, if not please e-mail)..
(he posted also that is very important to have a short, in best case shielded, SRC-I2C connection(-cable))..


so u use it before the I2S-input on the sabre-boards..
The Ti 4192 supports only sample-rates up to 212khz, the AKM AK4137EQ „Flagship“-SRC 😉 reaches per datasheet 768khz (PCM) + 12.288 MHz DSD and DR: 186dB !!THD+N: -150dB ->Link

(the first picture is with an AK4137-assembled board (80$)->Aliexpress-Link )

Markw4“ also said that it (the AK4137) sounds maybe „slightly better“..

some Ti SRC4392 is here (25$):-> LINK  

(u can get it also assembled+USB-port/connection (60$) -> LINK (as also posted earlier))

have to think about it 😉 ..

okay, next thing is that Volumio is now at 2.411 ->https://volumio.org/get-started/

and another funny/interesting fact is that as i´ve installed a new Win10, i didnt got foobar2000 configured with foo_out_asio although i thought i had all „components“ (foo-input-sacd, asio-proxyinstall etc..) correct „applied“, but i didnt have the „foo_out_asio“ selection (or asio at all)..

searched for the foo_out_asio_plugin but didnt find it (the right one)..

found it back in „our“ Topping DX4-driver pack->its here again foo-out-asio 2.1.2 (foobar2000 component)->http://essabre-90xx-rpi.sfb2.com/pics/foo_out_asio.fb2k-component

greets for now 😉

ESP32S: combined ES9038Q2M web-/BT control / filter+source-settings + HW-volume

so, 😉
in reading my (this) own blog, its really lately almost the same/repeating 😉 ..
but anyway, its a „blog“ and so today an update of this ES9038Q2M web-/BT-control..
i included now the complete „Bluetooth-control/block“ in the ESP32s-sketch..
by that i´ve included a NTP-time server function in the sketch/on the GUI..

i´ll post the sketch also in the forum->LINK, and i´ve learned a lot about the ESP32S, the usable (and which) GPIOs, setup different hardware.serials and so on..
its still a little bit difficult to get some really useful information/sketches for the ESP32S, so i post the sketch there too and maybe someone will find something useful information in it..(+general thoughts/hints)
the web-control GUI itself is now with the HW (Digi-Poti MCP4131)-control in max/min, 10,4 and 1 steps..(max/min,+10/-10,+4/-4,+1/-1)..(the „slider“(HW-volume)-function is in progress 😉 )
also the filter control is still working..

(the layout/fonts on the Mega2560 based 3.5″ display is btw. absolutely horrible and really shitty, cause i must use the „normal“ Adadruit.gfx-library with a super shitty command-set..before (with the other 2.8″ display i could use the „UTFT„-library->much much better/absolutely more comfortable+better looking)
greets for now and more to come 😉

OP-Amps: finally the AD797s arrived / a lot of room / fine-tune / laid-back sound / not such a „revelation“..

so 😉 ,
today my long awaited AD797s arrived..


first impressions:
a lot of „room“, almost „a laid-back“-sound, misses a bit the „liveliness“ from OPA2134, the „contur“ from the LME49710s and the „harmonics“ from the Muses8920 😉 .. (not so „spectacular“)
but again a bit less distorted and with more dynamics-(range)-THD..
in this case (at this level) i think its also very important in which different „devices“ u use the different-OP-Amps; voltage-wise and so on..
i´ve tested all the OP-AmPs on an ES9028Q2M (and some on the ES9038Q2M) with Volumio (on a pi) at full volume (no software-mixer)+ some with a Skysong-USB-bridge..(Win)
i think these needs more „burn-in/play-in“-time than the other..very „fine/high-resolution“-tone..
(i will then maybe post an update..)..
Conclusion (for now): not such a „revelation“ as the other (Muses8920, LME49710, OPA2134) but very fine, room, laid back sound..
if i had to choose between these 3 OP-Amps (Muses8920, LME49710 ,AD797) it would be really a very very difficult „task“, because they are really very „close/tight“ to each other with different advantages/disadvantages..
hmm..
the best for u would be, you order all the 3 (4) 😉 and get this „different-OP-Amp“-experience too..really..it was such a fun to „hear-out“ the differences, where others say that they even wouldn´t exist ..
fabulous, so much fun 😉 ..
so, i guess i would stick with my „allround“ Muses8920; guess its the best for now on this „cheap-manufactored“ chinese-boards..on more high-end equipment the AD797+LME49710s could be the better choice..
(but as also said,very very difficult to choose, maybe i´ll swap then again 😉 )..

so, another „building-lot“ is my combined ESP32S Bluetooth/Webcontrol now with the 4-port-relay for the filter settings + the MCP4131 (Digi-Poti) for the stepless HW-volume-control..
I´ve attached today my Mega2560 with an 3.5″ display via hardwareserial to it (rx,tx)(because i havent got the right libraries+pins+connections to set it also up on the ESP32s..)


i will have just to work out the right display/layout/font-settings (a lot of work anyway)..maybe i will also display some track-information on it->like Artist,Title, fileformat , length and so on..in Moode by example u can use a python script to send out some metadata-info…
a lot of possibilities and by the way, i don´t want to miss my HW-volume-control via Digi-Poti since some days anymore..
u have, as said, again a more finer/better option to adjust the overall volume..absolutely fine with these HW-volume control on the ES9038Q2M..


more to come, many greets and stay „tuned“ 😉

ES9038Q2M: HW-Volume Control MCP4131+Arduino Uno (sketch)..

so, 😉
at waiting for my 2 AD797s i just finished my long planned „ES9038Q2M-HW-volume control“ via some MCP4131+ an Arduino..
i originally wanted it to „combine/implement“ it with my „ES9038Q2M-filter-web-control“ on an ESP32S but there i have to first find out the right SPI-software/libraries and the pinouts; so not at present..
i took an Arduino Uno, one BT-Modul (HC-06), a 1602LCD and as said this MCP4131-digi-poti (1$ Ebay/Aliexpress)..

first post about it is here->http://essabre-90xx-rpi.sfb2.com/2018/02/es9038q2m-project-2-building-a-bt-controlled-hw-volume-control-digital-pot-10kohm-mcp4131/ and i used this very helpful article about controlling the MCP4131 via SPI from here:->http://www.learningaboutelectronics.com/Articles/MCP4131-digital-potentiometer-circuit.php





this mcp4131 has 128 steps and the usable „range“ on this ES9038Q2M is about 64-128; as also posted by someone else before, only after 50% you can hear any difference..
the sketch (via BT as said now) is „full-up“ (+128), „full-down“ (+85), and in 4 point steps (+4 and -4) example: 124,120 and so on and in 1 point steps(+1,-1)..
the „main“-point in the sketch is this:

int digitalPotWrite(int value)
{
digitalWrite(CS, LOW);
SPI.transfer(address);
SPI.transfer(value);
digitalWrite(CS, HIGH);
}

(its after the loop and u call the function simply with: „digitalPotWrite(i);“; where „i“ is the value (from 0-128))

Link (sketch) here + at the forum;

works here all very well and so u have another choice to adjust the volume (i use Volumio here without any software-mixer and therefore on 100% volume) than only via your amplifier and so u have some „finer“ adjustments..
nice thing (but as said, i will try to „pair“ it with my ESP32S-web-filter-control in future..),
many greets for now 😉

Op-Amps: LME49710 vs. Muses8920/LME49720/OPA2134 ->more „contur“

so, 😉
got finally today my Dual-Dip 8 converter (1,45€ Ebay) LINK->

that i can use my bought, nice „LME49710“-s (they are single)->

first impressions:
a lot of „contur“; more than the Muses8920; but no so „lively“ as an OPA2134 for example (or the Muses.)
i guess its absolutely because of the lower distortion; also a little bit „cold“ (all only my impressions; some would feel maybe different about it)..
but its also a „high-class“-duo/OP-AMP ; see this table again->

(and curiously absolutely exact my impressions about them; in only hearing them „out“ here..)

Conclusion (Ranking Op-Amps at present(for me)):
1. still the Muses8920, but really tight behind-> ((update 2hrs later: i don´t get it; everytime i plug the Muses back-in again, i´ve got everytime the feel:“thats really hifi !“; such warmth+musicality..so „harmonic“ (must have something to do with the 2nd and 3th grade harmonics and so on))
2. LME49710; about 4-10% (IMO 😉 (more „clinical“+“contur“; has also its advantages))
3. OPA2134 (because of its „lively/airy attitude“)->10-15% back (to the LME49710)
4. LME49720 (for me a little bit to thin; but also very good in the „highs“) ->2%-5%

and very interesting would be how the AD797 were „performing“; i had an AD1988 as soundchip and as i hardly remember they were absolutely „sweet“ in the highs; never had such a fine resolution (mainly in the middle/highs)..
+ the „Bugatti Veyron“(->Link) of the OP-Amps, the OPA627 😉 ..
so, at present i will stuck with my „Muses8920“ although the LME49710s are absolutely close to them (maybe better in some „scope“)
greets for now 😉 (and thats all only my impressions; they are all very close and it depends really on your personal taste !!)

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