Rb = Vbc / Ib 150 Ib = Ic = 0.0015 で Ic = 0.0015だから Ib = 0.0015 / 150 = 0.00001 Vbc = 16 - 4000 Ie - 0.6 = 16 - 4000 * (0.0015 + 0.00001) - 0.6 Vbc = 16 - 6.04 - 0.6 = 9.36 よって Rb = 9.36 / 0.00001 = 936k