What is a monostable multi-vibrator? 

Monostable multivibrators, or one-shot multivibrators, are integrated circuits (ICs) designed to produce a defined time delay in circuits. These types of devices are equipped with one stable and one unstable state, the latter controlled by a trigger pulse. The unstable state is designed to be transient, ensuring that the circuit goes back to being stable after the defined time has passed. Monostable Multi-vibrators, thus, are extensively used in modern electronics as timers and pulse detectors. 

Types of monostable multi-vibrators

Monostable multivibrators are mainly categorised into two types, determined by the effect of trigger pulses. These are:

• Retriggerable monostable multivibrators: These types of monostable multivibrators use the trigger pulse repeatedly so that the circuit remains unstable when needed. 
• Non-re-triggerable monostable multivibrators: As the name suggests, these types of monostable multivibrators remain unaffected by additional trigger pulses so that the circuit stays in an unstable state only for the predefined time. 

What is a monostable multi-vibrator made of?

A monostable multivibrator typically consists of two transistors, each coupled with a resistor-capacitor network and a simple resistor network. These two networks are responsible for determining the time a circuit can remain in an unstable state once triggered.