Astable Multivibrator Market Scope: Astable multivibrator, also known as free-running multivibrator, oscillates between two states, continually producing two square wave output waveforms.

There is nary a microcontroller to be found on this circuit sculpture, which uses a pair of astable multivibrator (s) to light two sets of LEDs that represent air being inhaled and exhaled.

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

Of course, blinking LEDs isn’t the sole purpose of a multivibrator. It is a method of producing a clean square wave which can be used as a clock signal for TTL logic chips.

The personal astable multivibrator is one popular product with a long pedigree, and it too has been enhanced by the addition of a CPU. The datasheets for these devices are notoriously incomplete. It's ...

Fig 2. U1a, connected as an astable multivibrator, outputs a sawtooth-like waveform across C1 (VC1). U1b compares VC1 to a reference voltage (VRef) provided by U3.