Introduction to Electronics: Diodes

Chapter V

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Diodes

In the world today and as part of modernization, we can’t deny the fact that the development of technology is very rampant. As part of its development, there are many devices that has component of different purposes. People benefited so much on the things that these gadgets give. Diodes are very evident and parts of the development of this component are the application that it brought to people. In some of our gadgets today, diodes are sometimes present especially if the gadgets involve light sensitivity. According to FacstuffBucknell, when we say diodes, these are devices specifically two-terminal devices and are similar to resistors and capacitors. These diodes don’t have many terminals like transistors. In this chapter we will get to know more about diodes and its types.

I. Types of Diodes

1. Baritt Diode

It is named after Barrier Injection Transit Time diode. It is commonly used in applications like microwaves and is similar to the more widely used IMPATT diode (which will be discussed

Source: https://goo.gl/Vc6hQB

2. Backward diode

It is not used in electronics and is the same or similar to the tunnel diode it has limited life as a diode too.

Source: http://goo.gl/xcqSSK

3. Laser diode

It is commonly used in generating microwave signals and is also opposite on how the backward diode operate.

Source: http://goo.gl/jy4gpr

4. Light emitting diodes

The light emitting diodes or LEDs are ones that we commonly used today. These diodes produce different color may it be green or blue.

Source: https://goo.gl/qvoMha

5. Gunn Diode

These diodes produces coherent light and are widely used in many applications like DVD and CD drives into laser light pointer and many others.. It’s more expensive than LEDs but like it these have limited life.

Source: http://goo.gl/XcLCTW

6. PIN diode

This kind of diode has P type and N-type areas that are standard and has intrinsic semiconductor. It does undergone doping. This is helpful for photodiodes.

Source: http://goo.gl/04DjGO

6. Photodiode

This diode is used to detect light. It operates in reverse bias conditions that involves small amount of current flow so that this light that can be easily detected. This can be used to generate electricity in its application.

7. Schottky diodes

These are constructedby having a metal to semiconductor. These are used as clamping diodes especially in RF applications, and even for the rectifier applications.

Source: https://goo.gl/rS9LNo

8. Tunnel diode

It is very important for microwave applications wherein it can exceed the performance than that of other devices that we have nowadays.

Source: http://goo.gl/Qx4X0v

9. Zener diode:

This diode enables stable voltage production. It provides reference voltage on a power supply that we have in most laboratories.

Source: http://goo.gl/dfdQL7

Applications of Diode

1. It is used in electronic devices like electronic watch, television, computer and many others.

2. It gives signal when the gadgets are on.

3. It helps in the production of stable voltage.

4. It is used to provide reference voltage on a power supply.

II. Experiment about diode

A. Objectives:

At the end of this experiment, readers will be able to

1. Identify the characteristics of LEDs

2. determine how LEDs can be manipulated

3. discuss diodes in their own words

B. Materials

1. Breadboard

2. LEDs

3. AC-DC Converter

4. Multi-tester

C. Procedure:

1. Set up the light emitting diodes in the breadboard in series connection.

2. Regulate the voltage output and get the voltage drop in each of the diodes.

3. Record the data in a tabulated form.

4. Set up the light emitting diodes in the breadboard in parallel connection.

5. Regulate the voltage output and get the voltage drop in each of the diodes.

6. Record the data in the table.

D. Data:

PARALLEL CONNECTION

V_OUT	Voltage drop, V					Current, I
V_OUT	V₁	V₂	V₃	V₄	V₅	I₁	I₂	I₃	I₄	I₅
2.8V	2.7V	2.7V	2.7V	2.7V	2.7V	N.D.	N.D.	N.D.	N.D.	N.D.
4.0V	3.7V	3.7V	3.7V	3.7V	3.7V	N.D.	N.D.	N.D.	N.D.	N.D.
6.6V	6.5V	6.5V	6.5V	6.5V	6.5V	N.D.	N.D.	N.D.	N.D.	N.D.
8.6V	8.5V	8.5V	8.5V	8.5V	8.5V	N.D.	N.D.	N.D.	N.D.	N.D.
12V	11.9V	11.9V	11.9V	11.9V	11.9V	N.D.	N.D.	N.D.	N.D.	N.D.

V_OUT	Voltage drop, V					Current, I
V_OUT	V₁	V₂	V₃	V₄	V₅	I₁	I₂	I₃	I₄	I₅
2.8V	2.7V	2.7V	2.7V	2.7V	2.7V	N.D.	N.D.	N.D.	N.D.	N.D.
4.0V	3.7V	3.7V	3.7V	3.7V	3.7V	N.D.	N.D.	N.D.	N.D.	N.D.
6.6V	6.5V	6.5V	6.5V	6.5V	6.5V	N.D.	N.D.	N.D.	N.D.	N.D.
8.6V	8.5V	8.5V	8.5V	8.5V	8.5V	N.D.	N.D.	N.D.	N.D.	N.D.
12V	11.9V	11.9V	11.9V	11.9V	11.9V	N.D.	N.D.	N.D.	N.D.	N.D.

V_OUT	Voltage drop, V					Current, I
V_OUT	V₁	V₂	V₃	V₄	V₅	I₁	I₂	I₃	I₄	I₅
8.0V	0.4V	0.4	0.4V	1.2V	0.4V	N.D.	N.D.	N.D.	N.D.	N.D.
9.8V	1.8V	1.6V	1.6V	2.8V	1.8V	0.5mA	0.5mA	0.5mA	0.5mA	0.5mA
13.0V	2.2V	2.0V	2.0V	3.0V	2.2V	40 mA	40 mA	40mA	40mA	40mA
16.0V	3.8V	2.8V	2.6V	3.2V	3.0V	145mA	145mA	145mA	145mA	145mA

E. Observation :

I have observed that when we set up diodes, we tried how many times just to let all the diodes produce light. When we set it up to series connection, all the diodes produce light. I guess it’s a matter of factors affecting it.

F. Questions:

1. Why do LE diodes produce light when it is in a series connection?

Based on our experiment, all the diodes produce light when it has been set into a series connection as a sign the voltage flow giving it current. In series connection the diodes produced light because of the voltage and current in it.

2. What factors affect the light of the LE diodes?

Some factors affecting light of LEDs are the materials itself, the diodes, the voltage regulator and the connecting wires. If one of them becomes functional, the materials are then affected.

3. What are the applications of LE diodes nowadays?

LEDs are applied in television, computer, electrical watch, and any other electrical gadgets that involves light.

G. Conclusion:

I learned about the complex nature of these Diodes and that I already know the different types of it that are applied in specific and different gadgets. I also learned that these are just around us, providing us with the necessary role for convenience.

References:

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Introduction to Electronics

Tuesday, October 13, 2015

Diodes

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