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When a negative pulse arrives at the emitter, its voltage is lower than the base voltage, so the transistor is forward biased.aspsrilanka said:
A multivibrator is an electronic circuit that produces a continuous output signal of alternating between two stable states. These states are typically referred to as "high" and "low" or "on" and "off". The circuit consists of two amplifiers, each with a positive feedback loop, which causes the circuit to switch between the two states.
A multivibrator is used in electronic devices to generate a square wave signal, which is a type of periodic waveform. This signal can then be used for various purposes such as timing, frequency generation, or triggering other circuits.
There are three main types of multivibrators: astable, monostable, and bistable. An astable multivibrator continuously switches between the two stable states, while a monostable multivibrator only switches to one state for a predetermined period of time. A bistable multivibrator, also known as a flip-flop, remains in one of the two states until an external trigger causes it to switch.
A multivibrator can be controlled by changing the values of the components in the circuit, such as resistors and capacitors. By adjusting these values, the frequency and duration of the output signal can be changed. Additionally, external triggers or signals can be used to control the switching of the multivibrator.
Multivibrators are commonly used in electronic devices such as timers, pulse generators, and frequency dividers. They are also used in digital logic circuits, where they act as memory elements or control the flow of data. In addition, multivibrators are used in audio and video equipment for signal processing and synchronization.
