12.8 Consider a VBE multiplier with R1 = R2 = 1.2 kΩ, utilizing a transistor that has VBE = 0.6 V at IC = 1 mA, and a very high β. (a) Find the value of the current I that should be supplied to the multiplier to obtain a terminal voltage of 1.2 V. (b) Find the value of I that will result in the terminal voltage changing (from the 1.2-V value) by +50 mV, +100 mV, +200 mV, –50 mV, –100 mV, –200 mV. (a) 1.5 mA; (b) 3.24 mA, 7.93 mA, 55.18 mA, 0.85 mA, 0.59 mA, 0.43 mA