There are 3-types of basic clock pulse generation circuits -
1. Astable - It is a free-running multi-vibrator which does not have any stable states and keeps switching in between the 2 states due to which square wave pulses at a fixed frequency are produced.
2. Monostable – It is a 1-shot multi-vibrator which has only 1 stable state. When an external trigger is applied, it returns back to its 1st stable state.
3. Bistable – It is a kind of flip-flop which has 2 stable states. It produces a single pulse with a positive or a negative.
A multi vibrator is a device that has two amplifying transistors or valves, each with its output connected to the input of the other, producing an oscillating signal. It is a circuit that has two stable states. A voltage represents each stable state.
Astable multivibrator is the one where the output jumps between the two stable states continuously. E.g., clocks used to drive microprocessor circuits.
The monostable multivibrator is the one where after the trigger the output changes for some time and then returns to the base state. The period can be from nanoseconds to seconds. E.g., logic circuits.
The bistable multivibrator is where the stable states on trigger change from one state to the other and stay there until another trigger returns it to the original state.
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