Astable Multivibrator: An astable multivibrator is a circuit that can maintain a specific output voltage or current level regardless of changes in input vol...
Astable Multivibrator:
An astable multivibrator is a circuit that can maintain a specific output voltage or current level regardless of changes in input voltage or current. It operates in a self-regulating loop, where the output feedback is used to control the input signal. This self-regulating property ensures that the output remains stable and predictable.
Monostable Multivibrator:
A monostable multivibrator is an astable multivibrator with an additional feedback mechanism that prevents it from transitioning between stable states. This feedback circuit typically consists of a comparator that compares the output voltage to a reference voltage. If the output voltage falls below the reference voltage, the comparator activates a transistor or other switching device, which then turns on the output transistor. This keeps the output voltage above the reference voltage, ensuring that the multivibrator stays in a stable state.
Differences between Astable and Monostable Multivibrators:
| Feature | Astable Multivibrator | Monostable Multivibrator |
|---|---|---|
| Operating principle | Self-regulating loop | Comparator feedback |
| Transition between stable states | Possible | Impossible |
| Example | 555 timer | 555 timer with a Schmitt trigger circuit |