alex26 Posted August 27, 2012 Share Posted August 27, 2012 La un amplificator Pioneer am cate 4 finali pe canal - 2 buc. 2sb541 si - 2 buc. 2sd388 , celalalt canal e ok.Din acesti 4 finali am arsi un sb541 si un sd388.Pot inlocui doar acestia 2 arsi sau trebuie toti 4 schimbati , si ceva echivalenti daca se poate care sa i gasesc usor.Deasemenea si 2 prefinali din cei 4 sunt arsi un b536 si un d381Am doar prefinali dintr-o alta statie Yamaha , si va intreb daca sunt ok. A968 si C2238. Va multumesc. Quote Link to comment Share on other sites More sharing options...
naebv Posted August 27, 2012 Share Posted August 27, 2012 Comparati singur citind urmatoarele datasheeturi: http://alltransistors.com/pdfview.php?d ... iconductor http://alltransistors.com/pdfview.php?d ... iconductor http://alltransistors.com/pdfview.php?d ... iconductor http://alltransistors.com/pdfview.php?d ... iconductor http://alltransistors.com/pdfview.php?d ... f&dire=_no http://alltransistors.com/pdfview.php?d ... f&dire=_no Acum, cunoscand datele tranzistorilor, nu ramane decat sa cautati in catalog un echivalent sau un superior. De exemplu, puteti incerca sa montati in loc de 2SD388 si 2SB541 o pereche MJ15003 si MJ15004 (chiar daca au fT mai mica ceilalti parametrii principali sunt superiori), dupa ce in prealabil i-ati "imperecheat" sa aibe hFE apropiat si mai ales atentie sa nu fie contrafacuti: http://alltransistors.com/pdfview.php?d ... re=_onsemi Succes! Quote Link to comment Share on other sites More sharing options...
alex26 Posted August 28, 2012 Author Share Posted August 28, 2012 Legat de cei 2 prefinali ai mei difera fata de cei originaliMaximum collector current (Ic max): 1.5A fata de 3 A siTransition frequency (ft): 100MHz in loc de 40 MHz Am inteles acum, dar care ar fi cei mai importanti parametri de care se tine cont la echivalente ale tranzistorilor. Tensiunea Ucb, Uce , Ueb , Maximum collector power dissipation, Maximum collector current , sunt suficiente?Va multumesc. Quote Link to comment Share on other sites More sharing options...
naebv Posted August 28, 2012 Share Posted August 28, 2012 In principiu tensiunile limita (Vceo si Vcbo), curentul de colector maxim, putere maxima disipata, frecventa de tranzitie, hFE. Cam acestia ar fi parametrii principali dupa care se poate incerca o echivalare a tranzistoarelor bipolare de joasa frecventa. Quote Link to comment Share on other sites More sharing options...
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