(a) For the circuit of Problem 5.1, draw load lines in the I_c - V_ce plane for R_L = 0 and RL→ ∞. Use an I_c scale from 0 to 30 mA. Also draw constant power hyperbolas for P_c = 0.1 W, 0.2 W, and 0.3 W. What is the maximum possible instantaneous power dissipation in Q₁ for the above values of R_L? Assume that the driver stage can supply a maximum base current to Q₁ of 0.3 mA and β_F = 100 for Q₁.

(b) If the maximum allowable instantaneous power dissipation in Q₁ is 0.2 W, calculate the minimum allowable value of R_L. (A graphical solution is the easiest.)