This document discusses diodes, which are semiconductor devices that allow electric current to flow in only one direction. It describes the construction of diodes using P-type and N-type semiconductors, forming a PN junction. Diodes have two characteristics - when forward biased, current can flow, and when reverse biased, little to no current flows due to the high internal resistance. Different types of diodes like power diodes, signal diodes, Zener diodes, and photo diodes are described along with their applications. The document explains that diodes work by only allowing current to flow in one direction through the PN junction.

1. Dioda AC
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2. INTRODUCTION
Diode is a two-pole active component which is
generally a semiconductor, which allows electric
current to flow in one direction (forward bias
condition) and inhibits current from the opposite
direction (backward bias condition).
Its function is to deliver electric current in one
direction but inhibit electricity from the opposite
direction.

3. The Construction and
Symbol Of Diode
• Made from cpmbination of 2 extrinsic semiconductors, P-type
and N-type material.
• The joint between the P-type and N-type material is called PN
junction
• Have 2 terminal 9anode and cathode)
• Produced from the silicon water

4. DIODES
CHARACTERISTICS
Diodes have two characteristics, namely forward bias and
reverse bias.
1). Diode in Forward Bias
The first characteristic of the diode is that it is forward biased.
This diode is to provide an external voltage towards the
diode terminal direction.
2). Diode in Reverse Bias
The second characteristic of the diode is that it is reverse
biased. The anode electrode is connected to the negative
pole and the cathode is connected to the positive pole so
that the current flowing in this circuit will be smaller.

5. Diode types and applications

6. Power Diode
01.
• Rectifying power supply circuit (Rectifier =
penerus)

7. Signal Diode
• Signal sensor in radar
02

8. Zener Diode
• Voltage regulator in power supply circuit.
• Voltage clipper in power supply circuit.
03

9. LED Diode
• Indicator light in electronic circuit
04

10. Tunnel Diode
• Oscillator circuit iin an osciloscope
05

11. Varactor Diode
• Variable capacitor in a tune circuit
06

12. Photo Diode
• Light sensor in a remote control unit
07

13. Laser Diode
• Focused single colour light source in
compact disc player
08

14. How Diodes Work
The way the diode works is that the diode can only
pass one direct current, when the diode gains current the diode will
advance in one direction. This is because there is a junction on the
diode, which is the conductor junction between the P-type and N-
type.
Under these conditions the introductory conduction is
still relatively small. If the diode is reverse biased, the diode will not
work and in this condition the diode has a high internal resistance
which makes it difficult for current to flow.

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