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Dragan100:Allegro II i grafički ekvilajzer
#1
dopisivajući se sa Dragan100 natuknuh mu da mi se dopada kako radi Borin Allegro,kao i da bi mi odgovarala opcija odsecanja niskih tonova ("Low cut") pri korišćenju gramofona kao i opcija "loudness",a razmišljao sam i o grafičkom ekvilajzeru - to nikad nisam imao. posle nekoliko dana dobih od njega šemu celog sistema kako je on to zamislio:

(09-13-2021, 05:21 PM)Dragan100 Wrote: Ulaz je jedinični Buffer ili GAIN, vidi R32, u shemi je i obrazac za računanje potrebnog pojačanja
R32 = 1M, onda je cca jedinični Buffer
R32 = 1K, tada imamo pojačanje =2x ili 2V/V ili 20log2V/V=6dB

slijedi mu Baxandall tone kontrole sa 10K/LIN potovima
ako imaš želje za drugu vrednost potova, iskalkulira se za njih vrednosti
takodjer iskalkulira se vrednosti za druge "rezne" freq
pojačanje tone kontrola na FLAT je -1x (obrče fazu za 180°)

Izlaz tone kontrola je strujni (do nekih 25mApeak) i niskoimpedantni pa može slobodno iza njega
Volume sa Balance
Balance ako možeš nači, staviti Balance-Blend Center Detent (Split) Linear Pot, vrednost mu nije toliko kritična
recimo:
↓https://www.ebay.co.uk/itm/114025767885


Na sredini su oba kanala na max
kad ideš u jednu stranu, jedan kanal se smanjuje dok drugi do tog kraja je uvijek na max
i na drugu stranu obrnuto.
Ovako:
https://www.picclickimg.com/00/s/MTM3MFg...ned-_1.jpg

ako se ga teško dobije, staviti običan LIN

Volume pot ili LOG ili LIN, to uvijek po želji, neko voli odmah jačinu (več oko 9...10 o`clock) a neki kasnije oko 14...16 !

Nakon Volume imamo opet GAIN sklop koji izravnava slabljenje preko Aktive Loudnessa
Loudness kriva se korigira po želji, promenom dva konda, jednog za Bass i jednog za Treble krivu reza.
Loudness pot neka je LOG jer inače imamo Linearan porast prema max,
a kako imamo sluh LOG,
onda bi sa LIN potom odmah osetili več Loudness na manji regulaciji
i onda prema max imali bi tek zaznavne inkremente.
Tako da tu predlažem LOG pot.

Na kraju je INV Summator, sumira čisti signal + signal preko Loudnessa
i predstavlja i izlazni niskoimpedantni buffer.

U shemi su i ostali podaci, grafovi, SNR, THD kod standardnog 25omVrms signala, BW, odzivi regulacija
pošto su svi grafovi u dB, a dB jednostavno zbrajamo,
onda je max BASS i TREBLE sa Loudness na max, sve skupa oko +/-25..26dB regulacije

Shema



kao i preporuku na osnovu koje šeme da uradim grafički ekvilajzer:


.pdf   1980 NSC Audio grafički ekvilajzer.pdf (Size: 907,95 KB / Downloads: 16)

za njega ću debelo da iskoristim APEX TB10 pločicu jer izgleda da odgovara skoro pa kompletna,uz male izmene to će biti to:

možda bi čak pre koristio vrednosti otpornika i kondenzatora iz APEX TB10 jer bi njih mogao naći da budu svi FKP2. u PDF kojeg mi je dao Dragan stoje kondenzatori od 4.7 3.3 i 1.5uF što bi bilo ili glomazno,teško nabavljivo ili različitih vrsta kondenzatora.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------

za predpojačalo sam nešto juče radio na crtanju pločice. iako nisam sve završio ipak sam otprilike najgore prošao. ipak imam nekoliko pitanja pre nego nastavim sa crtanjem dalje.
najbitnje mi je pitanje oko napajanja IC kola. signalne vodove sam gledao da uradim koliko sam mogao kraće pa su samim tim napojni vodovi nešto duži. kod svakog IC sam postavio elko+blok u obe grane napajanja,stavio početak napajanja na IC1 i od njega nastvio dalje prema IC4. 
koliko je kritično kojim redom napajam IC kola?
da li je masa urađena dobro do sad,ako nije kako da je vodim?
uraditi "ground plane" korisno ili ne?

vodovi napajanja:

"Претпоставка је мајка зајеба..." : Д.В. - Дуд
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#2
dodao pojačalo za slušalice,po APEX ideji:



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.lay6   DRAGAN100.lay6 (Size: 968,97 KB / Downloads: 4)
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#3


отприлике основа за завршне радове. 

треба да проверим још исправност повезивања међу компонентама,преправим редни број сваког дела на плочици и вредности неких од њих.


Attached Files
.lay6   DRAGAN100.lay6 (Size: 1,01 MB / Downloads: 3)
"Претпоставка је мајка зајеба..." : Д.В. - Дуд
🇷🇸 🇷🇸 🇷🇸
"Pretpostavka je majka zajeba..." : D.V. - Dude
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#4
(09-19-2021, 07:30 PM)HomeMadeAudioProject Wrote: отприлике основа за завршне радове. 

треба да проверим још исправност повезивања међу компонентама,преправим редни број сваког дела на плочици и вредности неких од њих.

Odlično izgleda. Svaka čast
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#5
hvala na komentaru!
"Претпоставка је мајка зајеба..." : Д.В. - Дуд
🇷🇸 🇷🇸 🇷🇸
"Pretpostavka je majka zajeba..." : D.V. - Dude
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#6


preimenovao sam brojeve komponenti na šemi,prepakovao i na pločicama. lista je baš poduga,ima tu svega na kraju: 

ideja od koje se krenulo je Borin Allegro

sad je zapravo Dragan100

Bracin predlog za suzbijanje nevolja sa sekundara transformatora
 
APEX je ideja za pojačalo za slušalice

a opet je još korišćen deo iz Allegra za odloženo uključenje izlaza,i prekid izlaza kad se uključe slušalice (onaj deo oko NE556)

ne mislim da bi iko sa voljom poredio ovo što sam uradio sa datim šemama,a bio bi mnogo zahvalan kad bi bilo ko uzeo delić celine neke od šema pa ga proverio,svega par delova,nasumično.

svakako ću ja još da poradim na označavanju rednih brojeva sa pločice tj da ih prenesem na šeme kod APEX dela i NE556 dela sa relejom,a i planiram da zaokružim i imenujem na pločici segmente svaki za sebe.
biće lakše za posmatranje.


Attached Files
.lay6   DRAGAN100.lay6 (Size: 1,61 MB / Downloads: 3)
.txt   APEX DJ MIKSER.txt (Size: 1,68 KB / Downloads: 3)
.pdf   allegroPSU-schematic.pdf (Size: 31,1 KB / Downloads: 6)
"Претпоставка је мајка зајеба..." : Д.В. - Дуд
🇷🇸 🇷🇸 🇷🇸
"Pretpostavka je majka zajeba..." : D.V. - Dude
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#7
izgled pločice kojoj je predviđen potenciometar za glasnoću da bude u ravni sa bas-visoki-Loudness:



izgled pločice kojoj je predviđen potenciometar za glasnoću da bude iznad potenciometara za bas-visoki-Loudness,kako je i nacrtano u Dragan100 šemi-samo bez balans potenciometra:



u drugoj opciji obrnuto je uzdizanje i spuštanje bas i visokih tonova (desno minus,levo plus) ali nisam mogao celu pločicu da precrtavam-nemam snage za još jedno crtanje svega ovoga.

spisak delova:

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huh... 191 deo,i još više šansi da nešto pogrešim - nije ni čudo što mi je ovoliko vremena trebalo...

verovatno zalud pišem ali da ne bude da nisam rekao- ne treba niko da se zaleti ni slučajno da pravi ovo dok god ga ne sastavim i ne probam. jedino to bi bila potvrda da mi se nije omakla neka greška. svakako,po ovome ću raditi prvi uređaj,ukoliko ne nađem neku potrebu da nešto menjam iz bilo kojeg razloga.


Attached Files
.lay6   DRAGAN100.lay6 (Size: 1,47 MB / Downloads: 0)
"Претпоставка је мајка зајеба..." : Д.В. - Дуд
🇷🇸 🇷🇸 🇷🇸
"Pretpostavka je majka zajeba..." : D.V. - Dude
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