Question

Multivibrator which can produce a very short pulse or a much longer rectangular shaped waveform whose leading edge rises in time with an externally applied trigger pulse is called

• A. \( \text{Astable multivibrator} \)
• B. \( \text{Distable multivibrator} \)
• C. \( \text{Monostable multivibrator} \)
• D. \( \text{Tristable multivibrator} \)

Hint:

Remember the names of multivibrators correspond to the number of *stable* states they possess: \textbullet \ Astable No stable states (continuously oscillates). \textbullet \ Monostable One stable state (produces a single pulse upon trigger, then returns to stable state). Also known as a "one-shot" multivibrator. \textbullet \ Bistable Two stable states (flips between states with each trigger pulse, like a flip-flop).

Answer 1

The Correct Option is C

To solve this problem, we need to identify the type of multivibrator described by the characteristics mentioned in the question.

1. Understanding Multivibrators:

- A multivibrator is a type of electronic circuit that produces a waveform, typically used to generate timing signals or pulses. The most common types of multivibrators are:

• Astable Multivibrator: This is a free-running multivibrator that continuously alternates between two states (high and low). It produces a square wave without requiring an external trigger pulse.
• Monostable Multivibrator: This multivibrator has one stable state and one unstable state. It produces a single pulse of fixed duration when triggered externally. The width of the pulse can vary depending on the timing components used.
• Bistable Multivibrator: This type has two stable states, and it can store binary information. It is commonly used in flip-flops and memory circuits. It does not produce continuous pulses.
• Tristable Multivibrator: This type would have three distinct states, but it is not commonly used in basic multivibrator circuits.

2. Analysis of the Question:

The multivibrator described in the question produces a short pulse or a longer rectangular waveform with a rising edge that is triggered by an externally applied pulse. This is characteristic of a Monostable Multivibrator, which produces a single output pulse of varying duration upon receiving a trigger.

Final Answer:

The multivibrator described in the question is a Monostable Multivibrator.