Saturday, 22 October 2011

Class Again,,

For this class, we were focusing to the semiconductor components again. But this time, it became more details as many information have been told by En. Ridzuan. So, i will be focusing to the transistor because I have explained about the diodes in last post, before this.

transistor also a semiconductor components that is made up of two diodes and is a fundamental component in almost all electronics devices. The main function of transistor is to amplify and switch electronic signals and power. It is composed of a semiconductor material with at least three terminals for connection to an external circuit.

A bipolar (junction) transistor is a three-terminal electronic device constructed of  doped semiconductor material and may be used in amplifying or switching applications. Bipolar transistors are so named because their operation involves both electrons and holes. Charge flow in a this transistor is due to bidirectional diffusion of charge carriers across a junction between two regions of different charge concentrations. This mode of operation is contrasted with unipolar transistor such as field effect transistor, in which only one carrier type is involved in charge flow due to drift. By design, most of the this transistor collector current is due to the flow of charges injected from a high-concentration emitter into the base where they are minority carriers that diffuse toward the collector, and so transistor are classified as minority-carrier devices.

the BIPOLAR JUNCTION transistor

 In addition, we also learnt how to deal with IC (integrated circuit), or we can called it a chip or microchip. Most interestingly, this small components is made up by thousands or millions of tiny resistors, capacitors, and transistors. So, that is mean an IC can be as amplifier, counter, etc.

this is how an IC looks like

the first leg of an IC starts from the left.

Wednesday, 19 October 2011


Diode?,,actually diode is a type of two-terminal electric component with a nonlinear current-voltage characterisitics.A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material connected to two electrical terminals. Semiconductor diodes are widely used throughout all areas of the electronics industry from electronics design through to production and repair.

Have you ever seen this before?

Diode is made in many types such as LED(Light Emitting Diode), Zener diode, Laser diode etc. But for our lesson last week, only LED and diode have been used because they are familiar diodes and can be seen in almost all stuffs.

it is familiar to you right?

En. Ridzuan added some data, diagrams and components that made it very clear to us about this diode. In overall of his class last week, we managed to learn how to calculate the value of diode using multimeter and did data collection in the form provided by lecturer.
This is the symbol of diode.

Tuesday, 11 October 2011

Electronics Practice

Starting from last Tuesday, the lecture have been replaced by En. Ahmad Ridzuan bin Mohd Hanapiah. In overall of his two recent electronics classes, we were guided to learn about a few electronics components, such as transistor, diode, capacitor and resistor. Although we have already knew a little bit about such things, the information from En. Ridzuan made us clear and we gained  more understanding about these components.
The tutorial that have given to us is very interesting because there are many information about the components in details. So, we don't have to worry ourselves. Thanks a lot to En. Ridzuan.

For the second class in last week, we did a lot of practices included finding the value of each components,  using multimeter, and identifying the components based on the information given in the tutorial. Most interestingly, we did blowing up some components. Two capacitors became the victims in the experiment. But
please don't try this at home.

Based on the class, I understood that resistor can be measured in 2 ways. The first one is using the colour code. As the resistor are coded by using colours, we can determined the value of resistance of a resistor using the Colour Code Table (CCT).

This is what CCT looks like.

Instead of using CCT, multimeter is another way to calculate the value of the resistance. And by using this, we can get the actual value of the resistor with precision. Multimeter has many functions as it combined the function of voltmeter, ammeter, ohmmeter and capacitance meter. For the one who wants to know more about multimeter, check it out this video

Multimeter comes in many shapes and colour, but most important is the function of the multimeter. The most common multimeter in the market now you can have are like the picture below.

Next, we moved to deal with the capacitors. For capacitors, there are two types of them. First one is non polar capacitor while the other one is absolutely polar capacitor. Capacitors that we used in this practice are the one black in colour and another one is made up by many colours.

This is non polar capacitor.

The polar capacitor.(I couldn't find the colourful one)

Capacitance of capacitors can be determined by using 3 ways.

-Colour Code Table (CCT)
-By Inspection

For more information about inspection, you can click this inspection link..

In the end of the class, En. Ridzuan showed us an interesting experiment, that is the blowing part. Actually, he explode the capacitors just to show us what is the result when the capacitors are connected with the wrong ends. So, when he connect the capacitors to the current source, the capacitors took some times and exploded after that. Then, En. Ridzuan asked us to test it on another capacitor. 

In overall, the last week class was very interesting. I really hope that we can have another components to be exploded in the next classes. Last but not least, thanks for reading.

Monday, 10 October 2011

Class Three

Assalamualaikum I bid to all readers., we meet again for the third class of Electronics System Engineering. For the last week class, Dr. Kamal like to stress more about the reflective journal ,oral and affective good conduct assesments. He explained to us how the lecturers value and assess the students, what are the marks for being good conduct and so on.

By the same time, I understood that the lecturers were trying to tell us marks aren't the only thing, but the most important is how we behave in the class, response to the tasks given by lecturers and lastly what we can produce after graduation. So, marking system and assessments are the best way to make sure we,the students always be reminded to be good and observe our behaviors.

In the same meaning, we are forced to be good students and always have to show the goods in front of  teachers and lecturers. Agree?,..If you say yes, then, yes you are a hypocrite person. But being a hypocrite is not bad at all.  Now, see it on the positive side, the assessments or marking system is not only just to encourage us to be a 'hypocrite', they also practice us to be a good person. How about if the classes were held every day, so, we are going to be good and courteuos every day. It sounds good right?. In conclusion, the main key to avoid hypocrisy and to practice the good conduct everyday are sincerity and positive.

In the class, we have learned about the Course Learning Outcome 1 : explaining the fundamental physical mechanism of electronics systemand its development in industries. In the slide show, Dr. Kamal explained one of the basic topic in electronics engineering, about the semiconductor.

As we know, semiconductor is the heart of any electronics device or system. Technically, anything that uses radio waves or that is computerized depends on the semiconductor. There are many things related to semiconductor such as diodes, transistors, capacitors, etc.

Last but not least, Dr. Kamal showed us a video that concluded all about the semiconductor that we have learned already in the class. If you want to see the videos related to this topic just click here.

With that, I thank you. See you for the next class.


Saturday, 1 October 2011

The second class

For the last week of Electronics System class, Dr. Kamal continued his lecture about the fourth Course Learning Outcome, that is for recognizing the importance of good conduct and healthier environment in developing personal values as well as the society as a whole. For me, a good conduct is all about the humanity, harmony with divine law, and it reflects someone's lifestyle and their attitude. Without the good conduct our lives will become disorder and severe as there are no discipline, honesty, goods and pure natures to shape up our lives.

In my opinion, the good conduct should be practiced by people everyday starting from the infancy until the death. For muslim (including me), we are asked by our god, the only god, Allah, The Most Merciful to be a good and responsible human, and always practice the good conduct in our whole lives. But I think, all religions other than Islam also asked their followers to be the same. Should there is no person having lackness of pure natures in his life. In case, there are people who dont believe in God.

As a student like me, the good conduct can be practiced and valued by how we behave with friends, the lecturers and public. The way we communicate will reflect our attitudes and true behaviors. Other than that, we can train ourselves to be a disciplined person by practicing to submit the assignments or homeworks given by the lecturers on time.

In the future, if we practice the good conduct from the beginning, it will be easier when we work in a workplace as a society. By that time, we have to be prepared ourselves with these things because in the worklife, good conduct is very important.

In the class, Dr. Kamal showed us two examples of good conduct. The one was about The Honda's Brake Defect. In 23 Oct 2011, Honda Motor Co. recalled of nearly 528,000 vehicles worldwide to prevent the unlikely failure of a seal in the brake master cylinder. This showed that the Honda Motor Co. is responsible to their products. Although, it will take a high cost to recall the cars, the customers' rights always be the first. To read more click Honda's Brake Defect.

Another one example showed in the slide was about a Magical Hard Drive. A customer bought the 500Gb hard drive but magically when he put a video file in the hard drive, it will show only the last five minutes of the video when it is played. A very magical trick when he knew that the size of the hard drive is only 128Mb.

When the hard drive is opened,it looks like this:

At the end of the class, Dr. Kamal explained about the 5S means Sort, Stabilize, Shine, Standardize, and Sustain. Said Dr. Kamal, these five S are not only a housekeeping and cleanliness, but they likely more about to change the lifestyle and attitude of students.

 I think this is a little bit about the last week class. I will keep this blog updated for the next and next class. So,just wait and see. By~