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Transistor Multivibrator
MULTIVIBRATOR. A form of relaxation oscillator which comprises two stages that are coupled so that
the input of one is derived from the output of the other. A
multivibrator is basically two amplifier circuits arranged with regenerative
feedback. One of the amplifiers is conducting while the other is cut off.
The 3 types of multivibrators: ASTABLE, MONOSTABLE, BISTABLE.
Astable Multivibrator
The Astable multivibrator circuit has no stable state. With no external signal applied, the transistors alternately switch from cutoff to saturation at a frequency determined by the RC time constants of the coupling circuits. So an Astable multivibrator could either be called a pulse generator or squarewave generator depending on the value of the resistor and capacitors used in the circuit. A related IC used is the 555 Timer configured as an 555 Astable multivibrator.
Monostable Multivibrator
The Monostable multivibrator circuit has one stable state; one transistor conducts while the other is cut off. A signal [the Trigger] must be applied to change this condition. After a period of time, determined by the internal RC components, the circuit will return to its original condition where it remains until the next signal arrives.
IC Multivibrator schematic. A related IC used is the 555 Timer configured as an 555 Monostable multivibrator. Another IC is the 4098 Monostable multivibrator. The Monostable multivibrator is basically a trigger activated pulse generator.
Bistable Multivibrator
The Bistable multivibrator has two stable states. It remains in one of the stable states until a trigger is applied. It then FLIPS to the other stable condition and remains there until another trigger is applied. The multivibrator then changes back (FLOPS) to its first stable state.
