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Home ‣ Digital Electronics ‣ Multivibrators and 555 Timer Comments
  • Question

  • The bistable multivibrator is an R-C flip-flop.


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  • A. True
  • B. False

  • Correct Answer
  • False 

    • Multivibrators and 555 Timer problems

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    • 1. The input levels to a flip-flop must be maintained for a minimum time period both before and after the edge of the clock signal is applied.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The 7805 will get very hot if your circuit draws more than 0.5 A.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. There is no way to eliminate the effects of a switch bounce.

    • Options
    • A. True
    • B. False
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    • 4. A transfer function graph illustrates the most important specifications for the Schmitt trigger devices.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The term race condition describes the time that an active signal must be present at the input to a flip-flop before an active clock edge is applied.

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    • A. True
    • B. False
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    • 6. A single Schmitt trigger inverter is all that is needed to build a simple astable multivibrator.

    • Options
    • A. True
    • B. False
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    • 7. In the 74121, which is nonretriggerable, any triggers that come in before the end of the timing cycle are ignored.

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    • A. True
    • B. False
      • Discuss
    • 8. When extremely critical timing is required, a quartz crystal can be used.

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    • A. True
    • B. False
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    • 9. A comparator simply outputs a HIGH or LOW based on a comparison of the voltage levels at its input.

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    • A. True
    • B. False
      • Discuss
    • 10. When the 74123, a retriggerable monostable multivibrator device, ends its timing cycle it must be started all over again.

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    • A. True
    • B. False
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