MODULE 4. ELECTRONIC FUNDAMENTALS
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;
- 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 con-trolled rectifier(thyristor), light emitting diode, Shottky diode, photo conductive diode, varactor diode, varistor, rectifier diodes, Zener diode.
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