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1. DIODES

2. DIODES
• A diode is a semiconductor device that essentially
acts as a one-way switch for current. It allows
current to flow easily in one direction, but
severely restricts current from flowing in the
opposite direction

3. TYPES OF DIODES
• RECTIFIER DIODE
• LIGHT EMITTING DIODE
• SIGNAL DIODES
• POWER DIODES
• ZENER DIODES
• TUNNEL DIODES

4. RECTIFIER DIODE
•A rectifier is
a special type
of diode that
converts
alternating
current (AC)
into direct
current (DC).

5. Testing
Diode
using
DMM?

6. TESTING
DIODE
USING
AMM

7. APPLICATIONS OF DIODES

8. What is and
LED?
• A light-emitting diode
(LED) is a
semiconductor device
that emits light when
an electric current
flows through it

9. HOW TO
TEST AN
LED?

11. SIGNAL DIODES
• They are designed to
operate small
currents and high-
frequency signals
which is why they
are commonly used in
radio, television,
communication, and
switching circuits.

13. POWER DIODES
• Simple diodes consist of a
simple PN junction. They
are smaller in size and
lighter in weight, while
power diodes are in
modified form and they are
larger and heavier
normally. Power diodes are
usually available in metal
form

15. What is a
Zener
Diodes?
The zener diode is used as a
Shunt voltage regulator for
regulating voltage across small
loads.

16. How to test a Zener
Diode?

17. OPERATIONS OF ZENER
DIODES

18. TUNNEL DIODE
• A tunnel diode or Esaki diode is a type of semiconductor
diode that has effectively "negative resistance" due to the
quantum mechanical effect called tunneling. It was invented
in August 1957 by Leo Esaki when working at Tokyo Tsushin
Kogyo, now known as Sony.

19. PRINCIPLES OF TUNNEL
DIODE

20. What is a PIN diode?
• A PIN diode is a diode with a wide, undoped
intrinsic semiconductor region between a p-
type semiconductor and an n-type
semiconductor region. The p-type and n-type
regions are typically heavily doped because
they are used for ohmic contacts. The wide
intrinsic region is in contrast to an
ordinary p–n diode.