Babelfish XA252 / Babelfish XA252 SIT/ Babelfish XA252 SET

[Zen Mod]

 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

[Zen Mod]

Babelfish XA252 SET - graphs , 8R load, BFR=22R

 

as titled

rails as previously: +/-30Vdc, Iq 1A7-ish

[Zen Mod]

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

[Zen Mod]

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

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  

 

 

[prophet]

Bato, ti sa 11-im harmonikom zalazis u "opake" vode. Lecenje na celijskom nivou.

[chakija]

Znači ovaj je najbolji do sada

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

[Mikorist]

Pre sat vremena, chakija reče

Znači ovaj je najbolji do sada

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

Ama sacekajmo jos malo. Kapiram da ce nocas da sanja novu semu

[Woland]

2 hours ago, chakija said:

Znači ovaj je najbolji do sada

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

Mosfet varijanta 252 je bliska BJ2, SIT verzija je bliža SissySIT, DefiSIT

[mutayu]

1 hour ago, Mikorist said:

Ama sacekajmo jos malo. Kapiram da ce nocas da sanja novu semu

Kao da slika ulje na platnu, moramo da mu kazemo da stane!

[Zen Mod]

2 hours ago, chakija said:

Znači ovaj je najbolji do sada

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

 

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

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

 

 

[Zen Mod]

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 ...... 

[vinko]

Ti da sacekas. Nem' teorije.

[sp300b]

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.

 

[Zen Mod]

Sloba je sam svoju pcb nacrtao ......... zabava za letnje dane

[Zen Mod]

[Zen Mod]

[Zen Mod]

[Zen Mod]

eh, zaboravih ovde postovati, napravljena je i SET inačica

Schade, sta drugo

 

 

[Zen Mod]

8R graphs

[Zen Mod]

4R graphs

[Mikorist]

Ovo je kao da gledam grafik dve različite arome crne kave. Ništa dok se ne proba

[Zen Mod]

ja se ne micem iz moju radiJonicu

kako ce da probas?

tek jos kako bi probao sve 3 varijante