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Home ‣ Digital Electronics ‣ Multivibrators and 555 Timer Comments
- Question
When the 74123, a retriggerable monostable multivibrator device, ends its timing cycle it must be started all over again.
Options- A. True
- B. False
- Correct Answer
- False
- 1. A comparator simply outputs a HIGH or LOW based on a comparison of the voltage levels at its input.
Options- A. True
- B. False Discuss
- 2. When extremely critical timing is required, a quartz crystal can be used.
Options- A. True
- B. False Discuss
- 3. In the 74121, which is nonretriggerable, any triggers that come in before the end of the timing cycle are ignored.
Options- A. True
- B. False Discuss
- 4. A single Schmitt trigger inverter is all that is needed to build a simple astable multivibrator.
Options- A. True
- B. False Discuss
- 5. The bistable multivibrator is an R-C flip-flop.
Options- A. True
- B. False Discuss
- 6. Timing accuracy of more than eight significant digits can be easily achieved by using quartz crystals.
Options- A. True
- B. False Discuss
- 7. The 74S124 TTL chip is a voltage-controlled oscillator that will generate a specific frequency at Vout.
Options- A. True
- B. False Discuss
- 8. A multivibrator is a circuit that changes between two digital levels on a continuous, free-running basis or on demand.
Options- A. True
- B. False Discuss
- 9. A monostable multivibrator is commonly called a two shot.
Options- A. True
- B. False Discuss
- 10. The 8051 is a 40-pin IC. Twenty-two pins are needed for the four I/O ports.
Options- A. True
- B. False Discuss
Multivibrators and 555 Timer problems
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