Question
Which of the following circuits continuously alternates between two states without an external clock signal?
Answer Options
- A) Monostable multivibrator
- B) J-K flip-flop
- C) T flip-flop
- D) Astable multivibrator
Correct Answer: D
Explanation
Multivibrator circuits are a class of electronic oscillators or timing circuits categorized by the stability of their states. These circuits are widely used to generate square waves, clock signals, and timing pulses without requiring an external crystal or input waveform.
An Astable multivibrator (or free-running multivibrator) is defined by having no stable states. Because of regenerative feedback, the output continuously alternates (oscillates) between the two output states (high and low) at a frequency determined by its internal resistance and capacitance values, and it requires no external trigger or clock signal to operate.
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