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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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Second Semester Anna University lecturer notes – Site Title

Phototransistor The photo transistor is a light detector. Anna University – B. Derive the expression of maximum value of E0 and I0. Write KVL equations for each loop of the circuit, substituting the product IR for E in each resistor term of the equation.

It is used in light meters. It reaches at the junction J 2 breakdown. Series Resistance Two elements are in series if the current that flows through one must also flow through the other. Emitter current flows in output circuit.

Collector current IC ec211 in output circuit. Zener breakdown When doping is heavy then in reverse bias notws the minority charge carries acquire sufficient velocity the breakdown occurs and is known as Zener breakdown.

It exhibits a high input resistance, typically many mega ohms. Derive the relationship to express three delta connected resistances into star. Select a reference node E0 Assign unknown voltages E1 E Subscribe to eduladder news letter Today Subscribe Today.


The behavior of the voltage or current when it is changed from one state to another state is called transient state. Explain the breakdown in transistor. The time taken for the circuit to change from one steady state to another steady state is called the transient time. When LED is forward biased, the majority charge carriers moves from p to n and similarly from n to p region and becomes excess minority carriers.

Draw the equivalent circuit of UJT and explain its operation. Changing anode current by means of momentarily series or parallel switching arrangement. It is used in demodulator, encodes and light detectors systems. It is also known as impurity semiconductor.

The anode terminal is taken out from P 1 layer, and the gate G terminal from the P 2 layer. It is also ec211 Photo detector. This ability of the SCR to remain conducting, even when the gate signal is removed, is known as latching.

Draw mesh currents in loops of circuit, enough to account for all components. What is the resistance of an electric iron connected to the same source that takes as much current as a 1 Answer.

How to study this subject

A single tuned circuit is used for coupling an amplifier and radio receiver circuits. Solve for unknown mesh currents simultaneous equations. Now, there will be some empty state in valence band of p-side quite opposite to the empty conduction band. To reduce the holding current, it can be turned OFF. Once when this breakdown occurs the diode gets damaged. Newer Post Older Post Home. The voltage across PN junction can be applied in two ways.


At the saturation point the maximum junction capacitance is obtained and a point just above avalanche the minimum junction notew is obtained. It is rising rapidly at avalanche point. To supply majority charge carriers. Q factor The quality factor, Q, is the ratio of the reactive power in the ex2151 or capacitor to ec21511 true power in the resistance in series with the coil or capacitor.

In a linear, lumped element, bilateral electric circuit that is energized by two or more sources the current in any resistor is equal to the algebraic sum of the separate currents in fc2151 resistor when each sources acts separately.

The hole-electrons pairs are created. It is made of thin layer of semiconductor material cadmium sulfide.

The phototransistor cannot dc2151 directly used in control applications. Increase the reverse applied voltage in suitable steps. LCD is a passive type display device used to display alpha numeric character and is seven segment display, watches calculators etc. It has thermal stability. In this, the current through SCR is reduced below the holding current. Used for entering information into optical computer memories Used for solid video displays. It passes most of the injected charge carriers to the collector.