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Home ‣ Electronics ‣ Flip-Flops and Timers See What Others Are Saying!
  • Question

  • The equation for the output frequency of a 555 timer operating in the astable mode is: The equation for the output frequency of a 555 timer operating in the astable mode is: . What value .
    What value of C1 will be required if R1 = 1 kΩ, R2 = 1 kΩ, and f = 1 kHz?


  • Options
  • A. 0.33 µF
  • B. 0.48 µF
  • C. 480 µF
  • D. 33 nF

  • Correct Answer
  • 0.48 µF 

    • More questions

    • 1. 

      The output voltage in the given circuit is _____ at the end of the second pulse.


    • Options
    • A. 1.06 V
    • B. 7.56 V
    • C. 3.32 V
    • D. 12 V
      • Discuss
    • 2. If the input to a comparator is a sine wave, the output is a(n) _________.

    • Options
    • A. ramp voltage
    • B. sine wave
    • C. sawtooth wave
    • D. rectangular wave
      • Discuss
    • 3. The input resistance of the base of an emitter-follower is usually _________.

    • Options
    • A. very low
    • B. very high
    • C. shorted to ground
    • D. open
      • Discuss
    • 4. A resistor with a value of 9.9 kΩ 10% could have a value between 8.91 kΩ and 10.89 kΩ.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Signal comparisons may be most easily seen when using which item of test equipment?

    • Options
    • A. spectrum analyzer
    • B. multimeter
    • C. function generator
    • D. dual trace oscilloscope
      • Discuss
    • 6. The S-R, D-type, and J-K flip-flops are all examples of _________________.

    • Options
    • A. astable multivibrators
    • B. bistable multivibrators
    • C. monostable multivibrators
    • D. tristable multivibrators
      • Discuss
    • 7. Edge-triggered flip-flops must have _________.

    • Options
    • A. very fast response times
    • B. at least two inputs to handle rising and falling edges
    • C. a positive-transition pulse generator
    • D. a negative-transition pulse generator
      • Discuss
    • 8. What is the value of a capacitor labeled 102?

    • Options
    • A. 10,000 pF
    • B. 1000 pF
    • C. 1000 µF
    • D. 10,000 µF
      • Discuss
    • 9. What is the impedance of this circuit?


    • Options
    • A. 5928 Ω
    • B. 2000 Ω
    • C. 1902 Ω
    • D. 1798 Ω
      • Discuss
    • 10. A Schmitt trigger is a comparator with _______.

    • Options
    • A. modulation
    • B. a closed-loop gain less than one
    • C. hysteresis
    • D. a high threshold value
      • Discuss

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