7.1 INTRODUCTION
Multivibrators are switching circuits that employ positive feedback by cross-coupling the output of one stage to the input of the other stage, such that if one device is ON, the other is OFF. The interchange of states is possible either by the use of external pulses or by internal capacitive coupling. These circuits are used either to generate waveforms of a desired nature or to store binary information. Multivibrators are of three types—astable, monostable and bistable. An astable multivibrator is basically a square-wave generator. A monostable multivibrator generates a gated output (pulse) of a desired duration. A bistable multivibrator stores binary bits. In this chapter, we focus on astable multivibrators.
A transistor
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