Electronics - Operational Amplifiers - Discussion

What is monostable oscillator? does it require any external inputs to trigger?

There is no stable state at the input. It oscillates continuously at the output without any external triggering and it produce square wave at output.

An astable multivibrator is also known as a FREE-RUNNING MULTIVIBRATOR. It is called free-running because it alternates between two different output voltage levels during the time it is on.

The output remains at each voltage level for a definite period of time. If you looked at this output on an oscilloscope, you would see continuous square or rectangular waveforms. The astable multivibrator has two outputs, but NO inputs.

Astable multivibrators are also known as Free-running Multivibrator as they do not require any additional inputs or external assistance to oscillate. Astable oscillators produce a continuous square wave from its output or outputs.

Without an input basically an multivibrator works. Free running means it cannot bother which state it is. Whether 0 or 1 it works.

An astable multivibrator does not require an input clock, therefore can be described as "free-running" in that its running without a reference.

Generates the pulses and it could be of desired frequency controlled by the capacitor, hence pulses are free running.

As it is only one stable state either 0 or 1.