Dj Alex Posted July 24, 2009 Share Posted July 24, 2009 vreau sa imi construiesc o orga de lumini cu leduri dar nu am gasit tranzistor tip 31 ce altceva pot sa folosesc ? ceva inlocuitor ? Link to comment
danzup Posted July 24, 2009 Share Posted July 24, 2009 Merge bd139 , dar pentru curentul cerut de led-uri orice tranzistor BC din seria npn e perfect ! Link to comment
Dj Alex Posted July 24, 2009 Author Share Posted July 24, 2009 cam de vreo 3 ore am fost la magazin ca sa intreb de tranzistorul tip 31 miau zis ca nu il au dar ai un inlocuitor si mia dat un tranzistor 7805 dar nu merge Link to comment
danzup Posted July 24, 2009 Share Posted July 24, 2009 cam de vreo 3 ore am fost la magazin ca sa intreb de tranzistorul tip 31 miau zis ca nu il au dar ai un inlocuitor si mia dat un tranzistor 7805 dar nu mergeha ha ha ... 7805 e sursa de tensiune stabilizata ! 5v scoate la iesire la maxim 1A . Link to comment
adicontakt Posted July 24, 2009 Share Posted July 24, 2009 7805 e stabilizatorlater edit: danzup a fost mai repidbineinteles ca la magazine lucreaza toti nepriceputii( am vre-o cateva fatuci la mine in oras care lucreaza la magazine de componente electronice care sunt bate in materie de asa ceva)tip 31 nu o sa gasesti asta e o denumire generica a unui tranzistor npn Link to comment
Dj Alex Posted July 24, 2009 Author Share Posted July 24, 2009 cam asa arata montajul ii vreo problema daca am pus 3 grupe de cate 4 leduri in paralel ?? Link to comment
adicontakt Posted July 24, 2009 Share Posted July 24, 2009 cum am spus pune un bd135 , bd 137 sau bd139 daca se incalzeste pune-i si radiator Link to comment
Dj Alex Posted July 24, 2009 Author Share Posted July 24, 2009 am reusit sa o termin am folosit un tranzistor BD137 si functioneaza perfect mersi mult pt raspunsuri Link to comment
Dj Alex Posted July 26, 2009 Author Share Posted July 26, 2009 nu se incalzeste functioneaza foarte bine l.e: daca tot a venit vorba de tranzistorul L7808CV as vrea sa imi fac o sursa de tensiune stabilizata , dar nu am scheme ma puteti ajuta ? scuze pt atatea intrebari dar sunt si eu incepator stefan_ro: am lipit doua posturi consecutive. Link to comment
adicontakt Posted July 26, 2009 Share Posted July 26, 2009 in primul rand ca 7808 cum am mai spus nu e tranzistor , in al doilea rand sune ce fel de sursa reglabila sau fixa? ce tensiuni iti trebuie ce curent? pt un incepator ar fi buna una cu lm317 nnumai ca aceasta debiteaza un curent relativ mic dar e numai buna pt alimentat montaje cu leduri. uite o schema functionala http://www.electronics-lab.com/projects/power/010/ pt 7808 gasesti schema in datasheet figura3 http://sigma.octopart.com/5578/datashee ... 7808CV.pdf Link to comment
Dj Alex Posted July 27, 2009 Author Share Posted July 27, 2009 mam hotarat sa folosesc ca regulator de tensiune un LM317 dar problema ii urmatoarea am un traf ce scoate 35 V il pot folosi ? daca daca da dupaceia nu sunt probleme cu reglarea tensiuni ? Link to comment
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