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Astable Multivibrator OAstable Multivibrators generate a rectangular waveform. OThis rectangular-wave oscillator is useful in generating signals for digital circuitry, lamp flashers, sound generators and various other applications. . Basic operation OThe astable multivibrator works with both comparators tied together . OThis means that pin 6 of the upper comparator is tied to pin 2 of the A-stable multivibrator has two quasi-stable states and no-stable state. Its output changes its state from one quasi-state to the other. It does not require any external trigger input to change its state. Hence, it is also called a "free-running multivibrator". The output voltage waveform of an A-stable multivibrator is shown in Fig. 6.1. It Definition: A type of multivibratorwhose output consists of 2 stable statesis known as Bistable Multivibrator. The circuit switches from one stable state to the other when an appropriate trigger pulse is applied. In a nutshell, in a bistable multivibrator, one stable state can be maintained until a triggering pulse is provided. The multivibrator generates an output pulse of preset duration. This duration can be extended by retriggering the multivibrator before the preset time is elapsed, to remain high for the next duration. The duration starts when the trigger is applied. As long as the multivibrator keeps receiving the triggers periodically within the preset time durations, its output remains high and does not This is another stable state of the Multivibrator. Now, if this stable state has to be changed again, then either a negative trigger pulse at transistor Q 2 or a positive trigger pulse at transistor Q 1 is applied. Output Waveforms. The output waveforms at the collectors of Q 1 and Q 2 along with the trigger inputs given at the bases of Q W and It is also known as one-shot multivibrator. In a monostable multivibrator, the output pulse duration is determined by the RC time constant and is given as: 1.11*R*C. b. A Stable Multi-vibrator: A stable vibrator is a circuit with an oscillating output. It doesn't need any external triggering, and it has got no stable state. It is a type of Astable Multivibrators are automatically triggered multivibrators. Multivibrators are non-sinusoidal oscillators capable of generating waveforms other than sine waves. Relaxation oscillators with regenerative switching circuits, such as the Astable Multivibrator, are the most widely used because they are easy to build and provide a constant square wave output. The name "multivabrator" was initially applied to the free running oscillator version of the circuit because its output waveform was rich in harmonics . Multivibrator are a group of regenerative circuits that are extensively used in timing application . multivibrator is classified as (Types) : Astable multivibrator; Mono stable miltivibrator If the trigger input has returned to high level, the output of the threshold comparator will reset the flip flop (Q goes high), drive the output low