Pulse and Digital Circuits

9.2 BISTABLE MULTIVIBRATOR CIRCUITS

The two types of bistable multivibrator circuits considered here are fixed-bias bistable and self-bias bistable multivibrators. In the first circuit, two separate sources are used for biasing the devices whereas in the second one self-bias is used to derive the biasing voltage.

Besides the two circuits, there is a third variation of bistable mulivibrators, namely, the Schmitt trigger. This circuit, in addition to being used as a bistable, can also be used for other applications like waveshaping, comparators, etc

9.2.1 Fixed-bias Bistable Multivibrators

The circuit shown in Fig. 9.1(a) is called a fixed-bias bistable multivibrator as two separate dc sources are used to bias the transistors. The circuit consists ...