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Digital Electronics - Multivibrators and 555 Timer

Exercise : Multivibrators and 555 Timer - General Questions
26.
What is the pulse width of the output of a 74123 if an external 4.7-k resistor and a 0.022-F capacitor are used?
290 ms
29 ms
33.3 s
290 s
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
To obtain a 50% duty cycle in an astable 555 timer circuit:
tLO = tHI
RA = RB and short RB with a diode during the capacitor charging cycle
capacitor voltage must rise above 1/3 VCC
tLO = tHI, RA = RB, and short RB with a diode during the capacitor charging cycle
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
What is another name for a bistable multivibrator?
an on-off switch
an oscillator
a flip-flop
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
An astable 555 timer has the following number of stable states:
0
1
2
3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Which mode of operation is being used when a 555 timer chip has two external resistors and an external capacitor?
monostable
pulse stretching
Schmitt triggering
astable
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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