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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Operation of PNP transistors Forward bias causes the holes in the P-type emitter to flow towards the base. Adjust the gate current to zero value by keeping the switch open. Advantages High speed operation Ease of operation Low noise Low cost Low power Disadvantages It is two terminal device, there is no isolation between the input and output circuit.

One end of the channel is called the source and the other is nktes the drain. VIT University entrance exam for postgraduate stud The gates are connected together. This analysis looks strange because it involves replacing voltage sources with equivalent current sources. It is also possible to adjust phase angle such that impedance at generator side becomes resistive.


It is less noisy than a tube of a Bipolar Transistor. Change resistor values to conductance. Classification of Energy Band 1. Official Notes Add contents here Notes from other sources Add contents here Model question papers Add contents here Previous year question papers Add contents here Useful links Add contents here.

EC2151 Electric Circuits and Electron Devices ECED Notes

Injected electrons diffuse into the collector region due to the extremely small thickness of the base. SCR characteristics It is the relationship between nofes anode —cathode voltage and anode current at different gate current. Valence band Classification of semiconductors 1. Label resistor voltage drop polarities based on assumed directions of mesh currents. Switching speed is high. Where two mesh currents intersect through a component, express the current as the algebraic sum of those two mesh currents.

This corresponds to the reference node of the dual noyes. As a result the energy level in the n-side decreases when compared to the unbiased state. Derive the expression of maximum value of E0 and I0.

If a network contains energy storage elements, with change in excitation, the current and voltages change from one state to another state is called transient state. The movement of the hole-electron pairs in eec2151 properly connected circuit results in current flows. With the help of adjustable capacitive reactance, impedance matching is possible if the coupling is critical, sufficient or above. Order of a System: What is the resistance of an electric iron connected to the same source that takes as much current as a 1 Answer.


In some cases substrate is internally connected to the source terminal. It is rising rapidly at avalanche point.

It has long life time. It is a quantum —mechanical behaviors.

Phototransistor The photo transistor is a light detector. 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. It consists of two 4-layer diodes connected in parallel in opposite direction. These are called photovoltaic devices. Draw mesh currents in loops of circuit, enough to account for all components.