Basic ELECTRONICS

(2+1)ENGR MUHAMMAD SHAKEEL AKRAM

ELECTRONICS ENGINEERING FICT, BUITEMS.

3

CHAPTER 3

Special purposeDIODE

(from 7th edition)

4

Zener DiodeWorks in both forward and reverse directionIn reverse direction it comes in the range of 1.8V to 100V

5

Zener DiodeZener breakdown

Typically at low reverse voltage (5V).Breakdown characteristics

Voltage Regulation

6

Light Emitting DiodeElectroluminescence

• A large exposed surface area on one layer of the semi conductive material permits the photons to be emitted as visible light.

Anode= +ive Cathode= -ive

7

Liquid Color display (LCD)• Combination of two states of matter – the solid and the liquid• Advantages

• Low power consumption (uW)• low cost • Good contrast

• Disadvantages• Additional requirement of light source•  a limited temperature range of operation (between 0 and

60° C)• Low reliability• Short oper ating life

8

9