WEEK 14

Comparison Study of audio amplifier performances using Class AB, B and D topologies in portable audio devices.

The final week. In this week 14, the Engineers day was successful done on 24 Apr, 2012 from 2pm to 5pm. Students have setup their project earlier, from 12noon - 2pm.

Engineer's Day is the day for FYP students to display their Final Year projects. It is a semesterly event that potrays the ingenuity, innovativeness, creativity and quality of our students and also staff. Therefore, it is an important event for it reflects who we are and what we are capable of.

For S112, Engineer's Day will coincide with UniKL-BMI Open Day, which promises more crowd than ever. The day also mark the first time ever Inter-Section Robotic Challenge and Inter-Section Innovation Challenge projects to be displayed. Beside adding new prizes to those two Inter-Section challenges, new prize category also be introduced for Top Blog, the best project reporting by students through the use of blog.

The assessor have evaluate my project on Engineers day:

1. Madam Mazhaniza Binti Mazumil
2. Tuan Haji Zainudin Bin Kornain

Other than that, even if the circuit for Class D does not work but I have made the best explanation about my project to the assessors and demo the circuit to both of them. This week, I'm also began to write the  FYP reports and technical paper for submit to my supervisor before 18 May, 2012.

WEEK 13

Comparison Study of audio amplifier performances using Class AB, B and D topologies in portable audio devices.

In week 13, I doing some discussion with my supervisor that the things I'm need to do for the Engineers day in next weeks. I'm have to prepare the poster and slide that will be used when the assessor to evaluate my project on Engineers day. For S112, the assessment (Demo Day) will start on 24 Apr, 2012 from 2pm to 5pm.

Picture below show  the example of my poster:

Picture 1: My poster for Engineers day

I'm continues doing the troubleshoot on circuit Class D audio amplifier to make it's become fully function. The picture below show the circuit For Class D audio amplifier:

Figure 22: The circuit for Class D audio amplifier

I'm also doing the research between topology comparison (linear vs. Class D). The primary and main difference between linear and Class D amplifiers the efficiency. This is the whole reason for the invention of Class D amplifiers. The linear amplifiers is also very inefficient at about 50% typically for a Class AB amplifier, whereas a Class D amplifier is more efficient, with values in the order of 90% in practical designs.

WEEK 12

Comparison Study of audio amplifier performances using Class AB, B and D topologies in portable audio devices.

For this week, I design the casing to cover the circuit for make it's more smart and easy to carry. For each casing, I have to drill the hole for the input (power supply), audio input and output (speaker). After placing each circuit in the casing, I must check all the circuit if it's function or not because some mistake such as broken connecting wire or other than that.

Pictures below show the casing that I have used for the each circuit:

Figure 19: The complete circuit of Class B in the casing

Figure 20: The complete circuit of Class AB using TDA 2030 in the casing

Figure 21: The complete circuit of Class AB using TDA 2003 in the casing

For the Class D audio amplifier, I have some doing troubleshoot to know what the problem and it still does not work. A class D amplifier is basically a switching amplier or PMW amplifier. Efficiency of 90-95% are possible.

WEEK 11

Audio Amplifier Performances

In this week, I design, test and construct the circuit of Class AB audio amplifier using TDA 2003 after buying all the component. The TDA 2003 provides a high output current capability, very low harmonic and cross over distortion.

TDA 2003 characteristics:

1. Operating power supply (Min 8, Max 18V)
2. Power dissipation at Tcase = 20W
3. Storage and junction temperature = -40 to 150 C
4. Frequency response = 40 - 15000 Hz

The pictures below is the circuit of Class AB audio amplifier  using TDA 2003 that I'm successful design and construct:

Figure 16: The complete circuit of Class AB using TDA 2003

Figure 17: Testing circuit with Function generator and Oscilloscope

Figure 18: The result displays at Oscilloscope