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La Magnitud de la corriente Ic depende de la corriente Ib (corriente de base) Debe ser grande para que el transistor entre en saturaciĆ³n, cuando el transistor esta en saturaciĆ³n, permite libremente el paso de corriente. Ib esta controlada mediante R (resistencia de base). Ib=Ic/hFE hFE= ganacia minima = 40 Rb= V/Ib V=Vbateria-0.7