Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT)
Electron Devices and Circuits: Unit II: (a) Bipolar Junction Transistors (BJT) : Syllabus, Contents
PN Junction Devices | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
Electron Devices and Circuits: Unit I: (b) PN Junction Devices : University Questions with Answers (Long Answered Questions)
PN Junction Devices | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
Electron Devices and Circuits: Unit I: (b) PN Junction Devices : Two Marks Questions with Answers
Circuit Diagram, VI Characteristics, Solved Example Problems
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The simplest shunt voltage regulator circuit uses a zener diode, to regulate the load voltage. The Fig. 1.24.1 shows the arrangement of zener diode in a regulator circuit.
Block Diagram
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The a.c. voltage (230 V, 50 Hz) is connected to the primary of the transformer. The transformer steps down the a.c. voltage, to the level required for the desired d.c. output.
Symbols, Circuit Diagram, Operation principle, Characteristics, Equivalent Circuit, Breakdown Mechanisms, Comparison, Specifications, Applications
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
The zener diodes have breakdown voltage range from 3 V to 200 V. In 1934, a physicist Carl Zener investigated the breakdown phenomenon in the p-n junction diode.
Symbols, Operation, Construction, Classification, Applications
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The term laser stands for light amplification by stimulated emission of radiation.
Types, Symbols, Operation, Construction, Applications
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• A display consisting of seven LEDs arranged in seven segments is called seven segment display.
Symbols, Operation working principle, Construction, Biasing, Advantages, Disadvantages, Comparison, Applications, Solved Example Problem
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The LED is an optical diode, which emits light when forward biased. The Fig. 1.19.1 shows the symbol of LED which is similar to p-n junction diode apart from the two arrows indicating that the device emits the light energy.
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
Comparison of Rectifier Circuits
Circuit Diagram, Operations, Calculation, Formula, Advantages, Disadvantages, Applications, Solved Example Problem
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The bridge rectifier circuit is essentially a full-wave rectifier circuit, using four diodes, forming the four arms of an electrical bridge.
Circuit Diagram, Operations, Calculation, Formula, Advantages, Solved Example Problem
Subject and UNIT: Electron Devices and Circuits: Unit I: PN Junction Devices
• The full wave rectifier conducts during both positive and negative half cycles of input a.c. supply. In order to rectify both the half cycles of a.c. input, two diodes are used in this circuit.