Question 3. Consider a LM555 circuit with these parameters: R1 = 1M.2, R2 = 40k1 and C=20uF. Answer the following questions by including all the steps. (30 points, 6 points each) 1. Write the equation for Th and calculate its value. Th= 2. Write the equation for Trand calculate its value. TL= 3. Write the equation for the total period T and calculate its value. T = 4. Write the equation for the frequency fand calculate its value. f= 5. Write the equation for the duty cycle DC and calculate its value. DC =