Definition: Cathode ray tube, CRT is the heart of CRO which generates images when electron beam from the back of the tube strikes the fluorescent screen with sufficient energy. CRT technique was basically employed in conventional TV and computer screens. Constructional details of Cathode Ray Tube CRT consist of the following parts: Electron gun Deflection plate assembly Glass envelope Fluorescent screen Base, for connections The diagram given below shows the internal … [Read more...] about Cathode Ray Tube (CRT)
Linear variable differential transformer (LVDT)
Definition: LVDT, Linear variable differential transformer is an inductive transducer which converts linear motion or displacement into electrical signals. LVDT works on the principle of mutual induction. Here, the word differential is used as the output value we get is the difference value of voltages produced at the two secondary windings. Displacement provided is directly proportional to the output voltage generated. Constructional Details of LVDT The transformer has a single primary … [Read more...] about Linear variable differential transformer (LVDT)
Frequency Division Multiplexing (FDM)
Definition: Frequency division multiplexing is a multiplexing technique in which multiple separate information signals can be transmitted over a single communication channel by occupying different frequency slots within common channel bandwidth. FDM technique is basically used for muxing of analog signals. Look at the figure given below to understand how multiple signals can be transmitted over a common channel. In Frequency division multiplexing simultaneous transmission of the … [Read more...] about Frequency Division Multiplexing (FDM)
Power Amplifier
Definition: Power amplifiers are basically used to enhance the power level of the input signal. Power amplifier is also called large signal amplifiers, as in order to get large power at the output, input signal voltage required must also be large. The transistors that are employed in power amplifiers are termed as power transistors. Key terms of Power Amplifier Collector Efficiency: Efficiency is basically measured by the ability to convert dc power into ac power at the output. It is … [Read more...] about Power Amplifier
Superheterodyne Receiver
Definition: Superheterodyne receiver works on the principle of heterodyning which simply means mixing. It is a type of receiver which mixes the received signal frequency with the frequency of the signal generated by a local oscillator. The output of mixer provides a lower fixed frequency also known as intermediate frequency. These receivers are called Superheterodyne receivers as the frequency of the signal generated by the local oscillator is more than the frequency of the received … [Read more...] about Superheterodyne Receiver
Modulation
Definition: Modulation, the process in which the carrier signal is varied according to the information bearing signal also called the modulating signal. During modulation, some characteristics it can be amplitude, frequency, or phase is varied in accordance with the original information-bearing signal that has to be transmitted. The receiver at the destination end won’t be able to understand that particular modulated signal so it uses demodulator section and demodulates that signal so as … [Read more...] about Modulation
Communication System
Definition: Communication system basically helps in transmitting the data from an end to the other through a proper medium or channel. Based on the direction of transmission and reception the system is classified into two domains. The classification is such that: Unidirectional system or simplex system Bidirectional system or duplex system Half duplex system Full duplex system Simplex System This system allows one-way communication as it is only capable of … [Read more...] about Communication System
Characteristics of JFET
Characteristics of JFET: The characteristics of JFET is defined by a plotting a curve between the drain current and drain-source voltage. The variation of drain current with respect to the voltage applied at drain-source terminals keeping the gate-source voltage constant is termed as its characteristics. Basically, the characteristics are of two types that are output characteristics or drain characteristics, and the another is transfer characteristics. Let us discuss each of the mentioned … [Read more...] about Characteristics of JFET
JFET as an Amplifier
We are already aware of JFETs; now we should be acquainted with its application in electronics realm. An amplifier is one of the most significant electronic devices which is used in almost every domain whether it is communication system or power systems. In the same way, by which we use bipolar transistors as an amplifier, we can also utilize JFET as an amplifier. Using JFET as an amplifier To understand, how a JFET works as an amplifier, first we should be well aware of the fact that how does … [Read more...] about JFET as an Amplifier
Junction Field Effect Transistor (JFET)
Definition: JFET is an acronym used for Junction field effect transistor. The JFET works on the principle that the current, more precisely the output current which flows through the device varies with the applied gate voltage. Thus, the electric field applied at gate terminal control the flow of current through the device and thus its name is field effect transistor.It consists of three terminals that are gate, source and drain. The output current flows from the drain terminal towards the … [Read more...] about Junction Field Effect Transistor (JFET)