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(a)
Diode symbols;
Diode characteristics and properties;
Diodes in series and parallel;
Main characteristics and use of silicon controlled rectifiers (thyristors),
light emitting diode, photo conductive diode, varistor, rectifier diodes;
Functional testing of diodes.
(b)
Materials, electron configuration, electrical properties;
P and N type materials: effects of impurities on conduction, majority
and minority characters;
PN junction in a semiconductor, development of a potential across a
PN junction in unbiased, forward biased and reverse biased
conditions;
Diode parameters: peak inverse voltage, maximum forward current,
temperature, frequency, leakage current, power dissipation;
Operation and function of diodes in the following circuits: clippers,
clampers, full and half wave rectifiers, bridge rectifiers, voltage
doublers and triplers;
Detailed operation and characteristics of the following devices: silicon
controlled rectifier (thyristor), light emitting diode, Shottky diode,
photo conductive diode, varactor diode, varistor, rectifier diodes,
Zener diode. |
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(a)
Transistor symbols;
Component description and orientation;
Transistor characteristics and properties.
(b)
Construction and operation of PNP and NPN transistors;
Base, collector and emitter configurations;
Testing of transistors;
Basic appreciation of other transistor types and their uses;
Application of transistors: classes of amplifier (A, B, C);
Simple circuits including: bias, decoupling, feedback and
stabilisation;
Multistage circuit principles: cascades, push-pull, oscillators,
multivibrators, flip-flop circuits. |
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(a)
Description and operation of logic circuits and linear
circuits/operational amplifiers.
(b)
Description and operation of logic circuits and linear
circuits;
Introduction to operation and function of an operational amplifier used
as: integrator, differentiator, voltage follower, comparator;
Operation and amplifier stages connecting methods: resistive
capacitive, inductive (transformer), inductive resistive (IR), direct;
Advantages and disadvantages of positive and negative feedback. |
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(a)
Understanding of the following terms: Open and closed loop systems,
feedback, follow up, analogue transducers;
Principles of operation and use of the following synchro system
components/features: resolvers, differential, control and torque,
transformers, inductance and capacitance transmitters.
(b)
Understanding of the following terms: Open and closed loop, follow
up, servomechanism, analogue, transducer, null, damping, feedback,
deadband;
Construction operation and use of the following synchro system
components: resolvers, differential, control and torque, E and I
transformers, inductance transmitters, capacitance transmitters,
synchronous transmitters;
Servomechanism defects, reversal of synchro leads, hunting. |