The document discusses special purpose diodes, specifically zener diodes and LEDs, detailing their characteristics and applications. Zener diodes are primarily used for voltage regulation, while LEDs are utilized for lighting and display purposes. Both types of diodes play a significant role in modern electrical systems, offering efficient solutions for various applications.

1. Special Purpose Diodes
Zener Diode, LED, and Their
Applications
Presented by: Mrityunjay Pandey

2. Introduction to Special Purpose
Diodes
• • Diodes are components that allow current to
flow in one direction.
• • Special purpose diodes include Zener diodes
and LEDs.
• • These are widely used in voltage regulation
and lighting applications.

3. Zener Diode – Characteristics and
Operation
• • Zener diodes allow current to flow in reverse
when breakdown voltage is reached.
• • They are used in reverse bias for voltage
regulation.
• • Designed to have a specific breakdown
voltage for various uses.

4. Zener Diode – Voltage Regulator
Application
• • Used to maintain constant voltage across a
load.
• • Protects circuits from voltage fluctuations.
• • Commonly used in stabilizing power
supplies.

5. Advantages of Zener Diode as
Voltage Regulator
• • Simple and inexpensive voltage regulation
solution.
• • Provides circuit protection from voltage
spikes.
• • Effective for low-power electronic circuits.

6. Introduction to LED (Light Emitting
Diode)
• • LED is a semiconductor device that emits
light when forward biased.
• • Converts electrical energy into visible light.
• • Works on the principle of electron-hole
recombination emitting photons.

7. Structure of LED
• • Composed of a p-n junction that emits light
when forward biased.
• • Different semiconductor materials produce
different colors.
• • Basic structure includes an anode, cathode,
and lens for light emission.

8. Applications of LED in Indicative
Displays
• • Used in digital displays like clocks,
calculators, and remote controls.
• • Found in traffic signals, signboards, and
other visual indicators.
• • LED displays are energy-efficient and long-
lasting.

9. Applications of LED in Lighting
Displays
• • Common in household, commercial, and
industrial lighting applications.
• • Available in a variety of colors and
intensities.
• • Known for high energy efficiency and long
service life.

10. Comparison Between Zener Diode
and LED
• Zener Diode:
• • Used for voltage regulation.
• • Works in reverse bias.
• • Found in power supply circuits.
• LED:
• • Emits light when forward biased.
• • Used in displays and lighting.
• • Found in electronic indicators, lighting

11. Conclusion
• • Zener diodes are crucial for voltage
regulation in modern electronics.
• • LEDs have revolutionized lighting and display
technologies.
• • Both play an integral role in efficient,
modern electrical systems.

12. Thank You
• For further inquiries, feel free to reach out.
• Presented by: Mrityunjay Pandey