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# 2010-312THE7 - V CE,SAT = 0.2 V V BE,SAT = 0.8V Circuit...

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EE 312 Digital Electronics 2009/2010 Take-Home Exam Part 7 Due: 11/12 Mayl 2010 555 TIMER Q1. Consider the astable multivibrator circuit given below. (a) Choose R A , R B , and R C resistances such that the circuit operates at f = 100 Hz with 50% duty cycle with a tolerance of 10%, i.e., any duty cycle between 45% and 55% is acceptable. Choose resistors from standart %10 tolerance band. (b) (9pts) Draw the output waveform and capacitor voltage for this multivibrator. Calculate and indicate the rise and fall times clearly . Q2 . Consider the monostable circuit given below. At the FF outputs, logic 1 level is V CC and logic 0 value is 0 V. Transistor Parameters β = 10

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Unformatted text preview: V CE,SAT = 0.2 V V BE,SAT = 0.8V Circuit Parameters V CC = 12V I O = 10 mA C = 1 μ F V TR R 1 R S FF Q R 2 1 k Ω Comparator 1 Comparator 2 555 TIMER V OUT Q 1 I O C 10 μ F V CC Threshold Trigger Discharge V CC v C (t) Q V R V S R 1 R 1 V TH EE 312 Digital Electronics 2009/2010 Take-Home Exam Part 7 Due: 11/12 Mayl 2010 i) Assume initially V TR (0-) = V CC , v C (0-) = 0 V and V OUT (0-) = 0 V, determine V R (0-), V S (0-). ii) Calculate and plot v C (t), V R (t), V S (t), V OUT (t) for the trigger voltage V TR (t) given below. iii) Determine the output pulse width and discharge time of C. V TR t, msec V CC 2 0...
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2010-312THE7 - V CE,SAT = 0.2 V V BE,SAT = 0.8V Circuit...

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