4.1 Semiconductors
4.1.1 Diodes
(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.
4.1.2 Transistors
(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.
4.1.3 Integrated Circuits
(a)
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.
4.1.1 Diodes
(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.
4.1.2 Transistors
(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.
4.1.3 Integrated Circuits
(a)
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
Description and use of printed circuit boards.
Description and use of printed circuit boards.
4.3 Servomechanisms
(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.
(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.
