Multivibrator: Using deep positive feedback, the two electronic devices are alternately turned on and off by RC coupling, thereby generating a square wave output oscillator. Often used as a square wave generator. A multivibrator is a self-excited oscillator that produces a rectangular wave, also called a rectangular wave generator. "Multi-harmonic" means that the rectangular wave contains rich harmonic components in addition to the fundamental component. The multivibrator has no steady state and only two transient states.
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Working principle: The circuit has no steady state, only two temporary steady states, and no external trigger signal is needed. The Power Supply VCC is used to charge the capacitor C through R1 and R2, so that the uC gradually rises, and when it rises to 2VCC/3, the uO jumps. To the low level, the discharge terminal D is turned on. At this time, the capacitor C discharges through the resistors R2 and D, causing the uC to fall. When it drops to VCC/3, uO jumps to a high level, the D terminal is turned off, and the power supply VCC is again Capacitor C is charged through R1 and R2. In this cycle, the oscillation is continued, and the capacitor C is charged and discharged between VCC/3 and 2VCC/3, and a continuous rectangular pulse is outputted, and its waveform is as shown in (b). 