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MODULE 4. ELECTRONIC FUNDAMENTALS
4.1 Semiconductors
4.1.1 Diodes
Level A B1 B2
(a) — 2 2
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) — — 2
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.
4.1.2 Transistors
(a) — 1 2
Transistor symbols;
Component description and orientation;
Transistor characteristics and properties.
(b) — — 2
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.
4.1.3 Integrated Circuits
(a) — 1 —
Description and operation of logic circuits and linear
circuits/operational amplifiers.
(b) — — 2
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.
4.2 Printed Circuit Boards — 1 2
Description and use of printed circuit boards.
4.3 Servomechanisms
(a) — 1 —
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) — — 2
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.