Multivibrator

Posted on Feb 5, 2014

A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. The most common form is the astable or oscillating type, which generates a square wave - the high level of harmonics in its output is what gives the multivibrator its common name. astable, in which the cir

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cuit is not stable in either state - it continuously oscillates from one state to the other. Another name for this type of circuit is relaxation oscillator. monostable, in which one of the states is stable, but the other is not - the circuit will flip into the unstable state for a determined period, but will eventually return to the stable state. Such a circuit is useful for creating a timing period of fixed duration in response to some external event. This circuit is also known as a one shot. A common application is in eliminating switch bounce. bistable, in which the circuit will remain in either state indefinitely. The circuit can be flipped from one state to the other by an external event or trigger. Such a circuit is important as the fundamental building block of a register or memory device. This circuit is also known as a flip-flop. A similar circuit is a Schmitt trigger. In its simplest form the multivibrator circuit consists of two cross-coupled transistors. Using resistor - capacitor networks within the circuit to define the time periods of the unstable states, the various types may be implemented. Multivibrators find applications in a variety of systems where square waves or timed intervals are required, but the simple circuits tend to be fairly inaccurate, so are rarely used where precision is required. An integrated circuit multivibrator, the 555, is very common in electronics. It uses a more sophisticated...

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