Mentok

proba koncepta neke pločice za 2-u-1 pojačalo, a prilagođeno mojim hladnjacima i nekim mojim potrebama, naravno Zen-ovi uradci
vikend ubivanje vremena

su to ladnjaci od Chakije, od pre milijon leta?
 
edit: podrazumeva se da to boranije oko LT3092 mora biti sto blize
zenerke mogu biti gde oces , ali otpori i trimpot, oma blizu

proba koncepta neke pločice za 2-u-1 pojačalo, a prilagođeno mojim hladnjacima i nekim mojim potrebama, naravno Zen-ovi uradci
vikend ubivanje vremena

120R otpori sa obe strane ref. CCS-a su antioscilacijske mere i stvarno je najbolje da su smd i sto blize samom chipu
zeneri u red su da se ne pretera sa naponom preko CCS jerbo isti je declared do 40Vdc
 
zavisno od planirane disipacije - vodi racuna o planiranom hladnjaku i najboljem mogucem rasporedu izlaznih tranzistora na istom
 
ene, kad ides da napravis mali pcb, obicno ispade da su tranzistori preblizu
neki korektan kompromis je ovo : 
 

Da. Za mesec dana. Na zalost dve druge posiljke preko SpeedPAK iz Kine nikada nisu stigle (proslo vise od godinu dana). Ovo me prijatno iznenadilo.

How it sounds ...... will it drive F4? 
I'm gonna toss all my precious ( 'till today) SITs and VFets to OPLDF bin, cruncher is gonna work these days anyway .....
 


THD Spectra comparison with SissySIT - go to #7 in https://www.diyaudio.com/forums/pass-labs/371272-sissysit-3-a-post6626308.html

some pcb porn

Yup, improved iteration of previously made Babelfish M25
Who remembers - 'twas bstrdzd FW M2 with implementation of XA25 main trick - Square Law arrangement of OS mosfets, in simpler words - mosfets in OS put to work without source resistors
Result - looooow THD of OS, but main difference being broader A Class envelope , most prominent in context of 4R load - where regular M2 is KlunK!ing around 12-13W, while B. M25 doing the same around 40W ...... rest to max being KlunK!
This pcb made for easy implementation of Schade arrangement for one OS mosfet, arbitrary chosen to do that with lower one, even if that is making some problems with choice of small mosfet for source follower/level shifter ....... I need one with lower Ugs treshold ( it adds to Schaded mosfet Igs) , and P channel small mosfets with that are scarce, somewhat
Anyway, find enclosed both schmtcs, full one ( all parts on pcb populated) for SET (Schade Enhanced Thingie) and second - few parts omitted - for Babelfish M25 R.2
note - slight tweaks of THD Spectra, for one's Golden Ears, possible with change of output mosfets - down one can use either IRFP9140 or 9240, up can go IRFP240 or 150
about that later
reminder - extensive ( if crude) explanation of biasing mechanismus posted in LuDEF thread , posts #32-#37, LuDEF
Today - all files for Babelfish M25 R.2 ; anyway - read captions - each file is properly named and have caption

 

few funny pics more
conclusion - all 3 iterations (2N1099, 1T813, 2SA1491) are fun to listen, sharing same holographic quality, which is most probably result of extrafunny THD Spectra

imam ( negde su i na slici) P210, nekih 10-ak komada  ali mi mirise da su malo problematicni po pitanju temperature na 25W disipacije
a manje od toga nece da ide
 
 

Did mount 1T813 today, in place of 2N1099
fired it up, it set itself exactly at same Iq (as previously 2N1099) , did just minor tweak of output offset
same situation for both channels - everything perfect in static state
then connected old crummy Sigene to input, scope to out, no load, just to check does modulation reaching output
first channel OK
second channel - started , and somewhere at half ( of max) thingie just went South - speaker DC protection dissengaged relays, got 48V across 0R11 resistor group ( where I need to see 110mV)
powered it off, logical check - dead mosfet, dead Ge, two 0R22 resistors dead ( there is a reason why there are 2 or 3W jobbies)
was it 1T813 Dud ? most likely ...... and now I'm thinking what and how to test them if I decide to get them in quantity
it seems test with actual load, fastest way of Ge tossed in 1L container of demi water is easiest way to do it
anyway - replaced what's Dodo, checked rest of circuit and fired it up again
this time everything went good, so did tried both channels with load, up to clipping

Kažu da je Zubu zelenom bolje...
 

mora prvo Leonardo da ti napravi jedno alu kućište za slušalice

mora prvo Leonardo da ti napravi jedno alu kućište za slušalice

mora prvo Leonardo da ti napravi jedno alu kućište za slušalice

Šta se čeka BA!  Ajmo ručice gore!  Idemo GB motherboardfuckeri!   

Naravno da sam se sjetio toga, ali....
moj laptop je zapravo firmin laptop i nisam administrator, pa ne mogu instalirati ništa na njega.
Ženin laptop je firmin laptop, pa....ista stvar.
Klinkin laptop je klinkin laptop. I ako ga uzmem, pa kao ovaj put dan i pol čačkam po njemu....što da kažem - žao mi je da ga nema.
Nije nikad smjela imati niti svoj mobitel.... Propatila je puno i vjerojatno ćemo je razmaziti preko svake mjere, ali....to je jače od nas/mene.

 

pa nema jedan ispravan, kaže jedan skroz crko, drugi probija tek kad pojača.
pre no što ga raskopaš proveri najgluplje moguće uzroke u "mehaničkom" delu - da li su ispravni  - relej, prekidač za AB zvučnike (ako ima), potenciometar za volume, mada može da zeza i pot za balance ili neki čudni prekidači koji se obično nikada ne koriste pa prestanu da rade "od stajanja i nepomeranja" (MUTE, MONO, tome slično, opet ako ih ima na pojačalu)