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QUESTION 3: Semiconductor Diodes and Transducers

3.1 High DC voltages are needed for the operation of appliances such as televisions, computer monitors, and oscilloscopes.
Draw a neat, labeled circuit diagram of a full-wave voltage doubler. (3)

3.2 Certain values of the junction capacitance can be controlled in a varactor (varicap) by adjusting the reverse bias voltage.

3.2.1 Draw a neat, labeled characteristic curve that describes the working of a varactor. (3)

3.2.2 Draw the IEC symbol of a varactor. (1)

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Final answer:

The answer provides a circuit diagram for a full-wave voltage doubler and explains the working of a varactor with characteristic curve and IEC symbol.


Explanation:

3.1 Full-Wave Voltage Doubler Circuit Diagram:

A full-wave voltage doubler circuit consists of two diodes and two capacitors connected in a specific configuration to double the input voltage.

3.2 Varactor Working:

Characteristic Curve: The characteristic curve of a varactor demonstrates how its capacitance changes with varying reverse bias voltage.

IEC Symbol of Varactor: The IEC symbol for a varactor resembles a capacitor symbol with an arrow pointing in, indicating its variable capacitance nature.


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