EC ELECTRIC CIRCUITS AND ELECTRON DEVICES the equivalent circuit of UJT and explain its operation. Write short notes on light activated SCR. 2nd Semester CSE Notes: 1. Basic civil & Mechanical Notes and Question answers – View. 5. Electron Devices & Electric circuits (EC) – Unit 1 – View /. PH Engineering Physics 2 Anna University Notes: PH Engineering notes (EM notes – ME Notes) – DOWNLOAD EC

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EC2151 Electric Circuits and Electron Devices ECED Notes

Label resistor voltage drop polarities based on assumed directions of mesh currents. It is less noisy than a tube of a Bipolar Transistor.

This is called Potential barrier or Junction barrier VB. The time taken for the circuit to change from one steady state to another steady state is called the transient time. These coefficients fall on a diagonal. The breakdown voltage can be selected with the amount of doping.

Advantages of LED They are smaller in size. Its intensity can be controlled easily. The two leads are connected to p-region of silicon separated by an n-region. It is also called Photo detector.

It is a quantum —mechanical behaviors. The movement of the hole-electron pairs in a properly connected circuit results in current flows. The light thus produced is emitted from the p-n junction of the diode.

EC Electric circuits and electron devices Lecture Notes- V+ Edition

Varactor diode Varactor diode is a specially manufactured reverse biased PN junction diode with a suitable impurity concentration profile. It passes most of the injected charge carriers to the collector. Increase the applied voltage across the SCR in small suitable steps at each step.


Thus, there is no direct electrical connection between the gate terminal and the channel of a MOSFET increasing the input impedance of the device. The gates are connected together. Used in image sensing circuits. The source and drain terminals are connected through metallic contacts the n-doped regions linked by an n-channel. Hence, the voltage drop across R is high.

Suresh kumar and A. It is used as a variable reactance capacitance. Order of a System: Once when this breakdown occurs the diode gets damaged.

Photovoltaic sensors It is a light-sensitive semiconductor device, and it produces a voltage, when the voltage increases and the intensity of light falling on the semiconductor junction of this photovoltaic cell increases. Write a KCL equation for each node 1,2, Breakdown voltage depends upon the amount of doping.

Conductivity of a semiconductor Each hole-electron pair created two charge carrying particles is formed. Used for entering information into optical computer memories Used for solid video displays. There are three terminals called anode Acathode K and the gate G.

It has long life time. These excess minority carriers diffuse through the junction and recombines with the majority carriers in n and nites region respectively to produce light. The light energy fall on the junction through lens, when, the PN photodiode junction is reverse bias. Used for entering information into optical computer memories Used for solid video displays. It is made of thin layer of semiconductor material cadmium sulfide.

Thus a barrier is set up against further movement of charge carriers.


ec21151 It is used in demodulator, encodes and light detectors systems. Any circuit with voltage sources, resistances impedances and open output terminals can be replaced by a single current source in parallel with single resistance impedancewhere the value of current source is equal to the current passing through the short circuit output terminals and the value of the resistance impedance is equal to the resistance seen into the output terminals.


The base current is supplied by the current created by the light falling on the Base-collector photodiode junction. Convert voltage sources in series with a resistor to an equivalent current source with the resistor in parallel.

Second Semester Anna University lecturer notes

Rest of the holes drift across the base and enter the collector region and are swept away by the negative collector electrode. The mobile charges have been depleted in this region. Classification of Energy Band 1. It is used in control circuits to control the current. The hole-electrons pairs are created. Applications of LED Used for numeric display in pocket calculators. It is applicable only for computing voltage and Current responses. Mesh Current method of analysis: Double tuned circuit In double tuned circuits, a variable capacitor is used at input as well as output side.

Due to this multiplication process a large current flows and this kind of breakdown dc2151 called Avalanche multiplication or breakdown. At resonance series RLC circuit acts as a voltage amplifier.