4.1 Semiconductors

4.1.1 Diodes

(a)

1. Diode symbols;
2. Diode characteristics and properties;
3. Diodes in series and parallel;
4. Main characteristics and use of silicon controlled rectifiers (thyristors),light emitting diode, photo conductive diode, varistor, rectifier diodes;
5. Functional testing of diodes.

4.1.2 Transistors

(a)

Transistor symbols; Component description and orientation;

Transistor characteristics and properties.

4.1.3 Integrated Circuits

(a)

1. Description and operation of logic circuits and linear circuits/operational amplifiers.

4.2 Printed Circuit Boards

Description and use of printed circuit boards

4.3 Servomechanisms

(a)

1. Understanding of the following terms: Open and closed loop
2. systems, feedback, follow up, analogue transducers;
3. Principles of operation and use of the following synchro system
4. components/features:
5. resolvers, differential, control and torque,
6. transformers, inductance and capacitance transmitters.