The Bistable Multivibrator is also referred to as a flip flop, Eccles-Jordan circuit, trigger circuit, or binary. It has two stable states. A trigger pulse applied to the circuit will cause it to switch from one state to the other. Another trigger pulse is then required to switch the circuit back to its original state.
Working Principle of Bistable Multivibrator:
The above figure shows the circuit of a bistable multivibrator using two NPN transistors. In this circuit, the output of a transistor Q2 is coupled to the base of transistor Q1 through a resistor R2. Similarly, the output of Q1 is coupled to the base of Q2 through resistor R1. The main purpose of capacitors C1 and C2 is to improve the switching characteristics of the circuit by passing the high-frequency components of these square wave pulses. This allows fast rise and fall times so that these square waves will not be distorted.