WEEK 3

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

For this week, I already chosen the right circuit diagram for Class B amplifier. This circuit diagram is simple and not using many component.

Figure 5: Schematic diagram

Figure 6: Illustration

Part and materials for Class B audio amplifier:

• Four 6 volt batteries
• Dual operational amplifier, model TL082 
• One NPN power transistor in a TO-220 package
• One PNP power transistor in a TO-220 package
• One 1N914 switching diode
• One capacitor, 47uF electrolytic, 35WVDC
• Two capacitors, 0.22uF, non polarized
• One 10kohm potentiometer, linear taper

Be sure to use an op-amp that has a high slew rate. Avoid the LM741 or LM 1458 for this reason.