Jump to content

Babelfish XA252 / Babelfish XA252 SIT/ Babelfish XA252 SET


Zen Mod

Preporučeni Komentari

 Babelfish XA252 SET

 


as my pal Indra, member of same Pantheon and evidently same Caste to which I belongs, asked ....... here is schm of Babelfish XA252 SET

fancyschmancy name for Schade iteration of full Mos OS, where upper output Mosfet is Schaded, so practically being emulation of SIT

gate resistor R50 increased to 750R, introduced new resistor R58 (18K)

SIT related parts (two rectangles of short dash lines) mounted - as for SIT iteration, but instead of M1 - IRF510 (we are using for SIT), placed DN2540

R46 changed to 33R

we need around 3V voltage level at left (inner) side of R50, so result as is - DN2540 gate voltage is 3-4V-ish (fine tune of R46 possible to achieve full symmetry of M1 and M3 gate voltages, trivial task) ; these being referenced to output node

all parts titles ref. to attached schm

once when I have final pcb, containing all 3 amps , schmtcs with proper nomenclature will be posted

I could avoid T8-Q9 30mA CCS, and route lower end of R46 to output node (M2 source), but as I already had CCS in place, why not using it

yes, as Indra said - Papa's fave gigglywiggly graphs are saying that 2nd is neg. in phase ; that not posted, just simulated, but no reason for doubt

Babelfish XA252 SET sch.png

Link to comment
Podeli na ovim sajtovima

Babelfish XA252 SET - graphs , 4R load, BFR=22R

 

everything the same, load changed to 4R

that's it; my preference sez that I'm not even going to try tests with 510R for BFR

as expected (ZM being lazy .......... I'm going to really check that maaaaybe later tonight, to actually compare graphs one by one) - this one being somewhere in the middle between B. XA252 and B. XA252 SIT

Babelfish XA252 SET 1W 4R.png

Babelfish XA252 SET 5W 4R.png

Babelfish XA252 SET 10W 4R.png

Babelfish XA252 SET 15W 4R.png

Babelfish XA252 SET 20W 4R.png

Babelfish XA252 SET 25W 4R.png

Babelfish XA252 SET 30W 4R.png

Babelfish XA252 SET 35W 4R.png

Babelfish XA252 SET 40W 4R.png

Babelfish XA252 SET 45W 4R.png

Babelfish XA252 SET 50W 4R.png

Babelfish XA252 SET Freq. 4R.png

Babelfish XA252 SET THD vs. Freq. 4R.png

Link to comment
Podeli na ovim sajtovima

OK, I've compared graphs

B. XA252 waaaaay down in THD at all power levels, so no real comparison, except same THD Spectra nature (that is more "except")

then, THD levels comparison between B. XA252 SET and B. XA252 SIT clearly shows that SET is uniformly approx. 6db down at each tested power level

in my book, that's pretty good emulation - achieving same behavior and consistency, while still making some desired difference ...... even ignoring that we are emulating nearly 100$ part (plus not so easy to obtain) with 25$ part :Viannen_loungelizard:

edit: for SET - did I said that even famous ∀ Class DEF current distribution is clearly evident - Schade SIT emulation is working as proper SIT in DEF - I like to see it as SIT being error corrector for Mosfet :rofl: 

 

 

Baldrick.jpg

Bullshit-Button-Lapel-1-Facebook-bw.jpg

einstein-quotes-imagination-8.jpg

Pippi horse.jpg

ZM-Wile-Genius.jpg

Link to comment
Podeli na ovim sajtovima

2 hours ago, chakija said:

Znači ovaj je najbolji do sada :)

S obzirom da je zvukom sličan B2J, mogao bi se i poslušati :grino:

 

pominjanje "najboljeg" mi izaziva osmeh, dok cekam da se brew prva jutarnja

to ti je kao da kontempliras koja je zena najbolja ....... dok ti ova sprema rucak a deca  koju ti je rodila ti ili skacu po glavi ili ih izvlacis pijane iz kafica

:Viannen_loungelizard:

W. mi svedok ( bar za 2) - ovo su prakticno 3 razlicita ampa ......... osnovni kvalitet im je zajednicki,  a razlike prave distinkciju na nivou licnih preferenci i ukusa

dakle ........... pominjanje "najboljeg" mi izaziva osmeh, eo vec se brew prva jutarnja

 

 

Link to comment
Podeli na ovim sajtovima

ene, napravljen je i SissySIT R.4 

promene su - jos stabilniji Iq u dinamickom rezimu, kao i kompletna DC sprega input-output

primenljivo za sve skorasnje ampove sa identicnim FE

no sacekacu jedno godinu dana sa objavom, dovoljno sam se u nogu upucao vec sad

 

.... sta - nogu ..... obe noge ...... 

Link to comment
Podeli na ovim sajtovima

  • 4 nedelje kasnije...

Alal vera Zene za projekat, hvala ti za svetlost dana XA252, kao i za podršku.

Delim u potpunosti mišljenje o zvuku (ono što ste Woland i ti napisali o utiscima).

Po meni, the best Babelfish, up to now.

 

XA252-sp300b.thumb.jpg.5f3b0beca50e25dd94a49b0582a794aa.jpgXA252-test-sp300b.thumb.jpg.606071853f36bd14491403899005c7e3.jpg

Link to comment
Podeli na ovim sajtovima

Kreiraj nalog ili se prijavi da daš komentar

Potrebno je da budeš član DiyAudio.rs-a da bi ostavio komentar

Kreiraj nalog

Prijavite se za novi nalog na DiyAudio.rs zajednici. Jednostavno je!

Registruj novi nalog

Prijavi se

Već imaš nalog? Prijavi se ovde

Prijavi se odmah
  • Članovi koji sada čitaju   0 članova

    • Nema registrovanih članova koji gledaju ovu stranicu
×
×
  • Kreiraj novo...