HW-Volume pinlayout – ES9038Q2M + OPA627AU/AD827
so, (another one today) 😉
found by chance a picture of the pin-assignment for the HW-Volume-control on an ES9038Q2M (its from the Audiophonics-site->Link..)(“we” knew it, but so its much “clearer”)
by that there´s also a wonderful picture from an combined Raspi/ES9038Q2M (its from the diyaudio-forum; hope i can use it here, if not, please e-mail)->Link
(i´m lately thinking also about to include some raspi directly in such a DAC too, because (as said and also in testing here) on a raspi (over I2S) u have an absolutely superior sound comparing to any XMOS-USB-device (over PC by example)->see this post too->http://essabre-90xx-rpi.sfb2.com/2018/05/moode-volumio-on-a-raspberry-pi-vs-samsung-bluray-player-spdif-coax-impressions-src4392-beta-project-2/ and whats all about this site too 😉 ..
third, on some japanese-yahoo-auction-site they also recommend/have the OPA627AU on it; but they use it only in the dual 15V “environment”, they recommend “strong +-15V” 😉 ..in the case of a single rail 15V they recommend the AD827 (JN) (and they made a special layout for both cases)->https://page.auctions.yahoo.co.jp/jp/auction/q238163678