The bistable multivibrator

This question was previously asked in
LPSC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 4 March 2018)
View all ISRO Technician Papers >
  1. has two stable states
  2. has one stable state
  3. is free running
  4. none of the above

Answer (Detailed Solution Below)

Option 1 : has two stable states
ST 1: Logical Reasoning
20 Questions 20 Marks 20 Mins

Detailed Solution

Download Solution PDF

Bistable multivibrator:

Bistable multivibrator has both the two states stable. It requires two trigger pulses to be applied to change the states. Until the trigger input is given, this multivibrator cannot change its state.

26 June 1

Astable Multivibrator:

An Astable multivibrator is a circuit that automatically switches between the two states continuously without the application of any external pulse for its operation, i.e. it has no stable state.

As this produces a continuous square wave output, it is called a free-running multivibrator.

Monostable multivibrator:

Monostable multivibrator has a stable state and a quasi-stable state. This has a trigger input to one transistor. So, one transistor changes its state automatically, while the other one needs a trigger input to change its state.


F1 U.B Madhu 09.05.20 D3