Digital Electronics - Multivibrators and 555 Timer
Exercise "I never see what has been done; I only see what remains to be done."
- Marie Curie
16.
Design a circuit using a 74121 to convert a 33-kHz, 30% duty cycle waveform to a 33-kHz, 60% duty cycle waveform.
A. R int = 2 kC ext = 0.012 nFB. R int = 2 kC ext = 0.012 C. R int = 4 kC ext = 0.012 nFD. R int = 4 kC ext = 0.012
Answer: A
Explanation:
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17.
What controls the output pulse width of a one shot?
A. the clock frequency B. the width of the clock pulse C. an RL time constant D. an RC time constant
Answer: A
Explanation:
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18.
Does the 74123 one shot have an internal timing resistor?
Answer: A
Explanation:
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19.
In a typical IC monostable multivibrator circuit, at the falling edge of the trigger input, the output switches HIGH for a period of time determined by the ________.
A. value of the RC timing components B. amplitude of the input trigger C. frequency of the input trigger D. magnitude of the dc supply voltage
Answer: C
Explanation:
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20.
A monostable 555 timer has the following number of stable states:
Answer: A
Explanation:
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, Cext = 0.012 nF
F