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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LED structure can be divided into two categories. Used for applying input power to lasers.

Therefore there are two nohes which are limiting the reverse voltage swing and the capacitance variation. Which of the following figures represents the electric field profile near the pn junction?

Transfer Point impedance The ratio of the voltage transform at one port to the current transform at the other port is called transfer point impedance. It is used in control circuits to control the current. Label resistor voltage drop polarities based on assumed directions of mesh currents. Now, there will be some empty state in valence band of p-side quite opposite to the empty conduction band.

Varactor diode Varactor diode is a specially manufactured reverse biased PN junction diode with a suitable impurity concentration profile. Molecules in ordinary liquids have random orientation but in a liquid crystal they are oriented in a definite crystal pattern. It differs from ordinary PN diode in the sense that it has three terminals namely Emitter, Base1 and Base 2.


It is achieved at the PN junction by providing the conduction bandwidth electrons from the N-doped side and the Valence band with the holes from the P-doped side. SCR size is very compact.

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It is used as a variable reactance capacitance. Its operation depends upon ev2151 flow of majority carrier only. Resonant Circuit The circuit that treat a narrow range of frequencies very differently than all other frequencies are referred to as resonant circuit. It is used in demodulator, encodes and light detectors systems.

Change resistor values to conductance. Thus a barrier is set up against further movement of charge carriers. There are three terminals called anode Acathode K and the gate G. Where is the Menu? At the saturation point the maximum junction capacitance is obtained and a point e2151 above avalanche the minimum junction capacitance is obtained.


It also exhibits a negative resistance characteristic which allows it to be used as an oscillator. It is used as a variable reactance capacitance. This is called Reach-through. Symbol Anode Cathode V-I Characteristics of Zener diode The operation of zener diode is same as that of ordinary p-n diode order forward biased condition, whereas under reverse biased condition breakdown of nltes junction occurs.

Adjust the gate e2151 to zero value by keeping the switch open. Describe the operation of Zener diode and explain its characteristics. Explain the diode current equation. Classification of Energy Band 1.


Parallel resonance is also known as Anti resonance. It has long life time. It has dc2151 main terminals namely Main terminal 1 and Main terminal 2.

The applied forward voltage is increased, a certain critical voltage called forward break over voltage Dc2151 BO. The maximum Power transferred to a load resistor occurs when it has a value equal to the resistance of the network looking back at it from the ecc2151 terminals all sources being replaced by their respective internal resistances. The voltage across PN junction can be applied in two ways.

Determine the resonant frequency and the nptes voltage at this frequency. Draw the equivalent circuit of UJT and explain its operation. Subscribe to eduladder news letter Today Nofes Today. 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.

Similar Questions Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?. It has found that most of the voltage will drop across junction J 1 only.

Find values of Q-factor for an inductor and capacitor.