ersa191 Posted October 11, 2019 Report Share Posted October 11, 2019 Oprostite što upadam na forum ali radim pojačalo Symasy AAK 1.4 i jedan kanal je ok namjesten bias kod drugog kanala nemogu namjestiti bias sa trimerom ispod 12V što je puno trebao bi biti oko 2.9V mjerno pad napona preko 10 ohm otpora sa + i - napajanja, pitanje što je krivo na drugoj ploćici i što je moglo otići ako netko može pomoći. Hvala Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 11, 2019 Report Share Posted October 11, 2019 Колики је пад напона на Р8/9/42/43? Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 Na ispravnoj plocici je 140mA na neipravnoj oko 0.5 A ako Vam pomaze Quote Link to comment Share on other sites More sharing options...
Gox co. Posted October 11, 2019 Report Share Posted October 11, 2019 Hoce da kaze da je izmerio 1.2A na redno vezanom otporu od 10 oma sa napajanjem. Mnogo je bitnije koliki je ofset napon na izlazu i koliki je napon na bazi izlaznih tranzistora. Quote Link to comment Share on other sites More sharing options...
Gox co. Posted October 11, 2019 Report Share Posted October 11, 2019 I naravno, ovo sto ti je moj kolega napisao koliki je pad napona na emiterskim otpornicima... Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 1 minute ago, Gox co. said: Hoce da kaze da je izmerio 290mA na redno vezanom otporu od 10 oma sa napajanjem. Mnogo je bitnije koliki je ofset napon na izlazu i koliki je napon na bazi izlaznih tranzistora. Sorry ne 290mA nego 2.9V sve drugo tocno Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 Offset na izlazu 2 mV i 4 mV Quote Link to comment Share on other sites More sharing options...
Gox co. Posted October 11, 2019 Report Share Posted October 11, 2019 290mA x10 oma daje 2.9V. Omov zakon Quote Link to comment Share on other sites More sharing options...
Gox co. Posted October 11, 2019 Report Share Posted October 11, 2019 Onda bih rekao da ti ne valja taj BD139, promeni ga i stavi drugi. Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 11, 2019 Report Share Posted October 11, 2019 6 minuta ranije, ersa191 said: Na ispravnoj plocici je 140mA na neipravnoj oko 0.5 A ako Vam pomaze Јел су плочице твоје дело илу су купљене готове? Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 Ok Hvala nadam se da ce to rijesit problem Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 Diy kucni uradak pegla papir i to Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 11, 2019 Report Share Posted October 11, 2019 1 minut ranije, ersa191 said: Diy kucni uradak pegla papir i to Тај БД 139 да би радио у том колу како треба мора да има што веће појачање, иначе то је лош транзистор осим што има могућност одличне монтаже на хладњак. Дај неку слику те скаламерије. Quote Link to comment Share on other sites More sharing options...
Gox co. Posted October 11, 2019 Report Share Posted October 11, 2019 I naravno, proveri da li si sve otpornike u krugu oko BD139 stavio na svoja mesta, mozda si pomesao vrednosti. Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 11, 2019 Report Share Posted October 11, 2019 14 minuta ranije, ersa191 said: Offset na izlazu 2 mV i 4 mV Прихватљиво. Quote Link to comment Share on other sites More sharing options...
jmiodrag Posted October 11, 2019 Report Share Posted October 11, 2019 16 minuta ranije, Gox co. said: I naravno, proveri da li si sve otpornike u krugu oko BD139 stavio na svoja mesta, mozda si pomesao vrednosti. Postovani, pre mi ovo liči da nevalja trimer R36. BD139 služi samo za bias i izmedju njegovih kolektora napon bi trebao da bude oko 2.8V a izmedju baze i emitera 0.7V. Pozdrav Misa Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 Po mom trimer radi bez problema tstirano na napajanju od 12v i sve radi jedino problem u mirnoj struji nemze kod trimera na minimumu biti manja od 0.45, 0.5 ampera Quote Link to comment Share on other sites More sharing options...
Nixie Posted October 11, 2019 Report Share Posted October 11, 2019 17 minuta ranije, ersa191 said: Po mom trimer radi bez problema tstirano na napajanju od 12v i sve radi jedino problem u mirnoj struji nemze kod trimera na minimumu biti manja od 0.45, 0.5 ampera Povećaj R34 recimo na 1k oma pa probaj ponovo. Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 11, 2019 Author Report Share Posted October 11, 2019 To sam i mislo ili BD139 ili smanjit otpor ali posto nisam strucnjak da pitam pametnije Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 11, 2019 Report Share Posted October 11, 2019 2 minuta ranije, ersa191 said: To sam i mislo ili BD139 ili smanjit otpor ali posto nisam strucnjak da pitam pametnije Зашто дирати отпорнике ако су исти у другом каналу и ради добро? Quote Link to comment Share on other sites More sharing options...
jmiodrag Posted October 11, 2019 Report Share Posted October 11, 2019 2 sati ranije, giZ_Mo said: Тај БД 139 да би радио у том колу како треба мора да има што веће појачање, иначе то је лош транзистор осим што има могућност одличне монтаже на хладњак. Дај неку слику те скаламерије. Postovani, kroz BD139 tece od prilike 9mA a kroz otpornik R35 i trimer R34 tece 1mA, prema tome dovoljno je pojacanje 10 Treba proveriti napom izmedju emitera i kolektora BD139. Ako je napon veci od 0.7V treba proveriti vrednosti R35 i vrednost trimera R34 Quote Link to comment Share on other sites More sharing options...
Nixie Posted October 11, 2019 Report Share Posted October 11, 2019 12 sati ranije, ersa191 said: To sam i mislo ili BD139 ili smanjit otpor ali posto nisam strucnjak da pitam pametnije Prvo proveri vrednosti ta dva otpornika i vrednost trimera, da nisu neke druge vrednosti. Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 12, 2019 Author Report Share Posted October 12, 2019 I dosta jako se griju Q20 i Q21mislim oko 40 45 stupnjeva na ispravnom ne na drugom da Quote Link to comment Share on other sites More sharing options...
ersa191 Posted October 12, 2019 Author Report Share Posted October 12, 2019 Sve sam pokusao jedino da zalemim otornik preko drugog 220 R Quote Link to comment Share on other sites More sharing options...
giZ_Mo Posted October 12, 2019 Report Share Posted October 12, 2019 2 sati ranije, ersa191 said: I dosta jako se griju Q20 i Q21 А 24 и 25? Quote Link to comment Share on other sites More sharing options...
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