Oscillation circuit diagram of a multivibrator

A multivibrator is a self-excited oscillator that can generate rectangular waves, also called a rectangular wave generator. It uses deep positive feedback to alternately turn on and off two electronic devices through resistance-capacitance coupling, thereby self-exciting an oscillator that generates a square wave output. As shown in the figure below, the oscillation circuit of the multivibrator is composed of (a) and ( b) consists of two parts, where (a) is a schematic block diagram of a multivibrator; (b) is a schematic diagram of the oscillation circuit of the multivibrator.