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exp_pre5 - HACETTEPE UNIVERSITY DEPARTMENT OF ELECTRICAL...

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HACETTEPE UNIVERSITY DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING ELE-314 ELECTRONICS LABORATORY III EXPERIMENT 5 COLLECTOR COUPLED MONOSTABLE/ASTABLE MULTIVIBRATOR 1. PURPOSE: To analyse the collector coupled monostable and astable multivibrators. 2. THEORY : There are three types of multivibrators, known as monostable, bistable and astable multivibrators. 2.1. MONOSTABLE MULTIVIBRATORS In this part the monostable multivibrator will be examined. Monostable multivibrators are mainly used in delaying and extending the duration of a pulse. If an external trigger is not applied, the monostable is at its stable state. When it is triggered externally, it switches to a quasi-stable state . Figure 1. Typical monostable multivibrator with discrete components. For the circuit shown above, V cc =10V, assume V BEsat =0.6V, V CEsat =0.2V, β =125. After a period of time determined by R and C (see fig.1) it returns to its stable state. As long as a trigger is not applied to the input, the circuit remains at stable state. A monostable multivibrator is depicted in fig.1. In stable state the base current of transistor T2 which flows through the supply and R is sufficient to force T2 into saturation. The collector-emitter saturation voltage VCEsat of T2 is coupled through R f to the base of T1 and
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hence T1 is OFF. Therefore V C1 = V cc . This state, i.e. when T1 is OFF and T2 is SAT, is the stable state and the circuit remains at this state unless an external trigger is applied. Assume that the circuit is at stable state at t=0- , and at t=0+ , an external trigger pulse brings the circuit to the quasi-stable state.
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