Blocking Oscillator – Definition, Operation and Types: The output of an active device may be coupled back to the input through a pulse transformer. If the relative windings polarities are properly chosen, the feedback will be regenerative and the circuit can be made to generate a single pulse (monostable operation) or a pulse train (astable …
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Symmetrical and Unsymmetrical Triggering: Triggering is the process of applying an external signal to induce transition from one state to another. The signal used for triggering is either a pulse of short duration or a step voltage. There are two processes of triggering viz: Symmetrical and Unsymmetrical Triggering. Unsymmetrical triggering is a process in which …
Commutating Capacitor or Speed up Capacitor: Whenever a triggering pulse is applied to change the bistable state from one bistable state to another, it is necessary that the transition period should be minimum and it should require minimum but finite amount of energy. First requirement of the triggering process is to bring the transistors into …
Bistable Multivibrator – Working and Types: A bistable multivibrator, as its name implies, has two stable states. It can stay in either of the two states indefinitely (as long as dc power supply remains on). Only an application of a suitable trigger pulse makes the circuit to change to the other stable state. The circuit …
Monostable Multivibrator – Operation, Types and Application: Monostable multivibrator is a two-stage amplifier with two states—one stable state and another quasi-stable state. The circuit has two transistors Q1 and Q2, one being in the offstate, say Q1, and the other, Q2, in the on state preferably in saturation. These transistors remain in this state for …
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Astable Multivibrator – Definition and Types: The multivibrator circuit which has no stable state is called the astable multivibrator. The two states of operation of astable multivibrators are quasi-stable (temporary) states. The astable multivibrator, therefore, makes successive transitions from one quasi-stable state to the other one after a predetermined time interval, without the help of …
Multivibrator definition and Types (Astable, Monostable and Bistable): A multivibrator is basically a two stage R-C coupled amplifier with positive feedback from the output of one amplifier to the input of the other, as illustrated in Fig. 31.16. Multivibrator is a switching circuit and may be defined as an electronic circuit that generates nonsinusoidal waves …
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Switching Characteristics of Power MOSFET: Power MOSFET is an enhancement mode device modified to handle much large currents and voltages than a conventional MOSFET. Prior to the invention of the power MOSFETs, MOSFETs could not compete with the power ratings of larger BJTs. But now the power MOSFETs are better than the power BJTs in …
Transistor as a Switch Circuit Diagram and Working: The Transistor as a Switch Circuit Diagram and Working can be explained with the help of its output characteristics. Figure 31.2 shows the output characteristics of a typical transistor for a CE configuration. The dc load line for a given collector supply voltage VCC and collector resistance …
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What is Switching Circuit? In practice, we often need making (switching on) and breaking (switching off) of an electrical circuit. It is also desirable and sometimes essential that the switching operation (making and breaking of an electrical circuit) be very fast and without sparking. For this purpose, we need a switch, which is defined as …