<Li> Bistable multivibrator, in which the circuit is stable in either state . It can be flipped from one state to the other by an external trigger pulse . This circuit is also known as a flip - flop . It can store one bit of information, and is widely used in digital logic and computer memory . </Li> <P> Multivibrators find applications in a variety of systems where square waves or timed intervals are required . For example, before the advent of low - cost integrated circuits, chains of multivibrators found use as frequency dividers . A free - running multivibrator with a frequency of one - half to one - tenth of the reference frequency would accurately lock to the reference frequency . This technique was used in early electronic organs, to keep notes of different octaves accurately in tune . Other applications included early television systems, where the various line and frame frequencies were kept synchronized by pulses included in the video signal . </P> <P> The first multivibrator circuit, the classic astable multivibrator oscillator (also called a plate - coupled multivibrator) was first described by Henri Abraham and Eugene Bloch in Publication 27 of the French Ministère de la Guerre, and in Annales de Physique 12, 252 (1919). Since it produced a square wave, in contrast to the sine wave generated by most other oscillator circuits of the time, its output contained many harmonics above the fundamental frequency, which could be used for calibrating high frequency radio circuits . For this reason Abraham and Bloch called it a multivibrateur . It is a predecessor of the Eccles - Jordan trigger which was derived from the circuit a year later . </P> <P> Historically, the terminology of multivibrators has been somewhat variable: </P>

What is the other name of astable multivibrator