What is another name for a free-running oscillator?

A free-running oscillator is primarily known as an astable multivibrator. This type of circuit generates a continuous square wave output without needing any external triggering, which characterizes its free-running nature.

In an astable multivibrator, two timing components (typically resistors and capacitors) determine the frequency and duty cycle of the output waveform, allowing it to oscillate indefinitely between its high and low states.

In contrast, the stable multivibrator is generally used to describe a circuit that maintains its state until an external trigger changes it, which does not fit the definition of a free-running oscillator. Similarly, a monostable multivibrator produces a single output pulse in response to an input trigger and then returns to its stable state, further distinguishing it from the characteristics of a free-running oscillator.

Thus, the correct association for a free-running oscillator aligns with the characteristics of an astable multivibrator.