Monat: Oktober 2021

PROJECT IV: PART 2 / fast update / benefits from Dual (+12V-0–12V) DC

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so, 😉

fast update: as my original plan (using the massive Cyrus-PSX-talema transformer (see posts before) + some AC-DC rectifier for dual-DC)) is now suddenly “obsolete” cause i´ve got no voltage output at the end of the chain (don´t know why at present) i used the power supply for the video-section (+12V-0V–12V) from the BDP9500 and my green ES9038Q2M for finally dual DC power supply..and first impressions ?

1.for the dual DC-thing: absolutely more exact left/right->absolutely better “channel separation” higher S/N i guess too, more “lively”..i knew and read a lot about it, and indeed, it has a great impact of the output (want not to go back to single DC) +

2.the high-class power-supply chain (from the BDP9500): absolutely lower “noise-floor”; everything more “lively/airier”, absolutely higher S/N-ratio (is absolutely clear->if u remove the background-noise, everything will get more in the “foreground” and is more clear + lively)..

i miss a little bit the “attack” which i got more, the more voltage i put in (IMO) and as said, the manufacturer says “..dual 15V (+15V-0V–15V)” and have now only 12V; will look for a way to solve this..

another result from this 2 “optimizations” is an absolute greater “presence” in the mids/vocals (here on Mission-speaker)..by that i´ve got the feel that i have to put the volume on the amplifier a little bit “up”, to get to the “sweet spot”->guess a good alternative could also be to reduce the DAC-volume via the onboard/onchip-volume-control via some poti to 90%-95% (and turn the amplifier up)->had this first checked with the ES9028Q2M some years ago 😉 -> http://essabre-90xx-rpi.sfb2.com/?p=440 and the result was fine..(the disadvantage is maybe a little bit worser SQ (because of the “altering”); have “to balance/check” it out) 

Conclusion: with these 2 “optimizations” you get some really interesting new ways/turns concerning the sound/character !! have now to adopt it in further testing out; dual DC + high quality power supply (+less EMI-noise +such)->to recommend !! 😉

greets for now (+ more to come) !! 😉

Project IV: Part 1 / Philips BDP9500-case + ES9028/38Q2M + USB-bridge + Pi4 + stuff

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so, 😉

as i´ve got today an old Philips BDP9500 (couldn´t read any discs (“no disc”) anymore, cheap, Ebay, 18€ !! (incl.shipping)) + also this Dual AC to DC rectifier->http://essabre-90xx-rpi.sfb2.com/?p=2708 i can finally start/begin with some “example”-tutorial how to build your own DIY-DAC !! (main “goal” on this essabre-site 😉 )

it´s only an example/showcase how to eventually do it..(a little story to begin with now):

okay, as this BDP9500 is trés chic 😉 (a really nice “blue”-light at the bottom) + massive, brushed, aluminium case and has this separated, dual power supply (one via some toroidal with 18V1 + 18V2 for audio) and one “power-line” with +12V-0–12V for the video section (+ also with some +5V/GND-lines)(i knew this “hifi-high-end-build-up” from the BDP9700 “Fidelio”(599€)->http://essabre-90xx-rpi.sfb2.com/?p=2576 and thats why i bought this BDP9500), we have now to find a way how to fit the other parts in it (the ES9028/38Q2M-board, the ESP32, AK4113,LCD1602 + oled-display (maybe a Pi 4), usb-bridge etc..)

it is really a long story/tutorial (cause i wanted to post the circuit diagramms from the Parts of the BDP9500 too etc..), a lot to do, and so i will post also a lot of steps (parts(ideas) “in between”)..

Part 1 (today):

as i´m relatively “unsure” if this +12V-0–12V works (from the second power-supply), i will use an old ES9028Q2M (want not to “destroy” some new ES9038Q2M) ->…

more to come …!! 😉