In a 555 Timer astable circuit calculator, the output voltage alternates between VCC and 0 volts on a continuous basis.

Fixing the long-first-pulse malady in less traditional 555 astable topologies including oscillators that make 50:50 symmetrical square waves.

Fixing the long ramp intervals of the typical gated 555 by adding a timing capacitor.

Motor speed controller using 555 timer ic in astable multivibrator mode to produce the PWM pulses necessary for control over the speed of the motor. A 555 timer ic, operating in astable multivibrator ...

On top of that, 555 timers can be integrated for use with cable testers, vehicle wiper speed controls, a timer switch, time delay generation, a monostable multivibrator, and an astable multivibrator.

In this project, we’ll place the 555 timer into its “astable mode.” Also known as an astable multivibrator or a free-running multivibrator, in this mode the IC output is a continuous signal ...

555 as Astable Operation If the circuit is connected as shown in figure below (pins 2 and 6 connected (shot)) it will trigger itself and free run as a multivibrator.