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)
(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 😉
got finally today my Dual-Dip 8 converter (1,45€ Ebay) LINK->
that i can use my bought, nice „LME49710“-s (they are single)->
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 !!)
hi there, 😉
long time not seen..its a little bit silent here lately but absolutely no worry/problem..
i´have here some Samsung Bluray-Player (BD-H5500); not the worst; only with some spdif-coax output..
some days ago i thought the only, true,real good sound is via some very good CD-transporter/drive/device + directly via spdif into the ES9038Q2M and go 😉 ..
but as i heard today again the ES9038Q2M with the raspberry pi (Model 3B) and some flacs i felt its really a class of its own !!
1-2 level (soundwise) higher !!
(at present btw. i think Volumio (hated it a long time) has a very good sound/tune; a bit better than Moode 4.1 (then picoreplayer and so on)..DietPi (V6.8 now) is still „in the lead“ (IMO) but usability-wise Volumio is great..)
so, back to topic: i really don´t know why the flacs on a pi (and via I2S) had a such great sound/tune in comparison to some „normal“ CD-spdif-combos (IMO)..absolutely don´t know why; but it is (and this is said by really a lot of people in the „Hifi-world“ ;-)..(maybe its because of this delta-sigma-conversion and the „required preliminaries“)..
by that i think meanwhile the spdif-„conversion“ on the ES9038Q2M could be a problem; its not soo high-class/hi-fi as expected..(spdif-receiver-side)
in my praised DIY-audio-forum->http://www.diyaudio.com/forums/digital-line-level/314935-es9038q2m-board-129.html, they are looking lately for some „SBC 4392“ asynchron frequency decoder boards for spdif/usb decoding with 144 db !! thd and ultra-low jitter too..
think absolutely the same here and because only of „hearing“ out the „distortion/jitter“ via the spdif-receive-unit/decoding on the ES9038Q2M..
(so to see u must use such a SRC4392 before your ES9038Q2M and then via I2S in it, bypassing the onboard-spdif..)..
so, by that i definitively want to try out some AD797 in future (have now some Muses8920 in it) and i also want to buy definitively a new, „Green“ ES9038Q2M V1.07 because i still think the „Blue“-ones (have one here) sound really not so hi-fi as they could/expected (we discussed it here a few weeks ago)..
by that i revive my „Project 2“ a little bit; means BT/Web-control for the different-filter+HW-Volume settings on an ES9038Q2M (u can meanwhile buy it as „set/package“ with display and rotary encoder/apple-remote but nevertheless)
this time i used some „Geekcreit ESP32S Devkit-V1„-board (links/first thoughts about also at the forum-> link-FORUM ) (first post)
(ESP32S connected to a PCF8754 via some 5-3.3V logic-level-converter, controlling a 4-port relay and then to the 4 jumper on the ES9038Q2M..HW-volume via some MCP4131 will come hopefully later..)
but as said earlier, i hear almost no differences between the filter settings on these ES9038Q2M, but when, i would prefer JP3+JP6=“linear phase fast roll-off„
(as said, here now listening to it with this filter-setting on a pi with Moode 4.1; and so „dry„; absolutely low latencies, perfect (but as said, Volumio/DietPi sound a little bit better (IMO))
many greets for now 😉
so, !! 😉
don´t understand/got it at first, but as „Terry“ sent us a link to the new Audiophonics-ES9038Q2M KALI-edition->
https://www.audiophonics.fr/en/diy-dac/audiophonics-dac-i-sabre-es9038q2m-kali-edition-raspberry-pi-i2s-spdif-pcm-dsd-p-12811.html, (Link-forum here)
i´ve looked through the description (after a few times visiting) and saw
„DietPi-compatible“ and this picture:
then i looked through some other audiophonics-documentation and there it says:(Link-Audiophonics-topic->LINK)
„..Audiophonics I-Sabre K2M DAC Board ALSA Driver !!“->“.. SatoruKawase/I-Sabre-K2M“ !!
and this is exactly the same repository „SatoruKawase/I-Sabre-K2M“which „Kennyliveforever“ mentioned and from, i guess, DietPi download the binaries for the changed „I-Sabre-K2M“.dts-overlay !
so, thats really a „game-changer“ !!
it´s so possible now to change the ESS-HW-control+FIR-selektion+Sources „on the fly“, means via an „alsamixer-terminal“ !!
„millions of new possibilities“ 😉 (display and usability-wise)
(just tried here right now to change the filter-settings via an alsamixer-terminal->no success..same with input-selection+HW-volume-control..guess its audiophonics/mcu-specific; but nevertheless a great improvement !!)
I´ve just seen at audiophonics too that it is possible to upload some driver (in this case audiophonics-ES9028Q2M) via the plugin-upload option in Volumio !! (maybe we´ll get there some new/updated „generic“ ES9038Q2M-driver too !!)(LINK)
thats all wonderful, greets for now !! 😉
again: i´ve changed the NE5532 on the ES9018K2m today to an „OPA2134“ and i hear absolutely great differences..
The OPA2134 is very „airy“,“lively“ (in comparison to the NE5532) see this post:->http://essabre-90xx-rpi.sfb2.com/2018/04/op-amps-ne5532-vs-opa2134-vs-muses-8920-02-essabre-link-dietpi-6-5/
and has (brings back) a certain „glance“ in the high-middles/highs..and this is all too because its very less „distorted“ than a NE5532 par example..
okay, it misses a little bit the „push“ from a NE5532->all said and written in the above mentioned post and some other..
(update: for me also too „thin“; but for this we have our lovely „Muses8920“ 😉 )
but the main fact is that there are absolutely great differences; okay i have here a Cambridge Audio Azur 540A amplifier and some phenomenal Mission-Cyrus-speaker; so more „monitor/neutral/british“-sound..
but i dont get it, why some people say (like in my „praised“ diyaudio.com-forum too) they hear almost no differences and „..there is to be cleared if its to hear at all“
are they (some) completely stupid there or what ? 😉
and such crap i´ve read also as i started to read/buy/change the Op-Amps on our lovely essabre-boards too and this „comments“ almost hindered me to start it at all..
so, to come back to start:
upshot: there are great differences by the different OP-Amps and u can hear it loud and clear !! 😉
the long promised „Allo Katana„, a „monster triple-dac“ hat->controller+psu/dac/output and with 6 Op-Amps from Allo is appearantly in the last stage..
(picture is from here-> http://www.forum-hifi.fr/thread-7848.html and relatively „fresh“ and/but i don´t know if this is exactly the promised Katana-DAC/HAT, but looks so..(95%))
by that if u really want some fresh/new audio-(dac-hat) info 😉 go to the phenomenal board diyaudio.com/forums..
absolutely superb there; there are sooo much super interesting threads->for example this http://www.diyaudio.com/forums/vendor-s-bazaar/310338-dac-allo-ess9028q2m-rpi-35.html or http://www.diyaudio.com/forums/digital-line-level/317577-allo-boss-dac-1-2-performance-4.html and so on and on..(some Link is also in the sidebar on the right->links)
this site is absolutely „low-mo“ 😉 in regarding/comparison to the super interesting infos there..
by that, as said, the „allo-katana“-.dts was accepted by the rpi-mainline-kernel maintainer->(link maybe later) and i first thought:“yeah, then we finally have our es9038q2m.kos for the chip“, but they said, this .dts adresses the special mcu by Allo which adresses then the ess9038q2m-chip..
anyway, here is (imho) a super interesting excerpt of the code for the .dts file: (sound/soc/codecs/sabre-ess.c and sound/soc/codecs/sabre-ess.h) from here:->https://github.com/raspberrypi/linux/pull/2519/commits/e67122b366f539713cf6ef91c63ab00cb269113d
it shows the different register of the es9038q2m (or in this case the allo-mcu but the basics are the same i think) + the adressing->
some user over there is also a few steps before reading out the mcus on our chinese-9038q2m-boards (i tried something similar a few months ago in trying to read out the mcu on a ES9028Q2M via the onboard SWIM-interface and with a ST-Link V2 but with no success)..
so, as said, very interesting, but go and visit these phenomenal diyaudio.com forums !! 😉
some new, fresh pics from an ES9038Q2M (V1.07)..the I2C-pins are now reachable via a socket->
(don´t know what else has been changed)
(pictures are from->http://audiodiyers.hu/viewtopic.php?f=48&t=3615&start=50 and „pbla„; hope i can use them here; if not e-mail)
(PS.: i personally have absolutely no problem with it if somebody is using the/“my“ pics(here)/is linking to some pics; absolutely not !!.)