
A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. It is characterized by two amplifying devices (transistors, electron tubes or other devices) cross-coupled by resistors or capacitors. The name `multivibrator` was initially applied to the free-running osci.....
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http://en.wikipedia.org/wiki/Multivibrator

a relaxation oscillator comprising for instance two transistors or electron tubes coupled by resistor-capacitor circuits connecting the input of each to the output of the other to produce an oscillation of high harmonic content
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-09-24

A building block in which the output is either High or Low. There are three foms of multivibrator: Monostable, bi-stable and astable. The monostable has only one stable state, the bi-stable has two stable states and the astable is free-running (no stable states).
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https://www.encyclo.co.uk/local/20687
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