a) Determine the maximum and minimum duty cycle that can be achieved by adjusting the potentiometer in the circuit below. Show how you will modify the circuit to achieve 50% duty cycle. Assume that RA = 40 k2, R3 = 5.8 k12. [8 Pts.] Vcc=9V RA RB 555 10 out 6 1000 pF 1 0.01 uF