Introduction
As we all know that amplifiers are the circuits that convert weak signals into high amplitude signals. However, the amplifiers are of two kinds preamplifiers and power amplifiers. Further, the power amplifiers are classified into different types. These include Class A, Class B, Class AB, Class C, etc. But, this article is about making the Class B Audio Amplifier of 15Watts. Before start making the circuit, first, we need to learn about Class B amplifiers
Brief Overview Class B Amplifier Circuit
The class B amplifier circuit is the device that conducts only one-half cycle that comes from an input signal. This means, that the amplifier has a conduction angle of 180 degrees. The class B amplifier circuit is more efficient than class A. And, it has an efficiency of 78.5%.
Hardware Components
The following components are required to make Audio Amplifier Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | IC | LM833 | 2 |
| 2. | Transistor | TIP41, TIP42 | 1, 1 |
| 3. | Potentiometer | 22K | 1 |
| 4. | Resistors | 10K, 1M | 1, 1 |
| 5. | Electrolyte Capacitor | 0.22uf, 47uF | 2 |
| 6. | Diode | 1N4148 | 1 |
| 7. | Speaker | 8 ohms | 1 |
| 8. | Power Supply | 12V | 1 |
| 9. | Ceramic Capacitor | 0.22uf | 1 |
TIP41 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of TIP41
TIP42 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of TIP42
Audio Amplifier Circuit
Working Explanation
To make the circuit, the dual opamp LM833 ICs are used. The IC provides a high slew rate with low distortion. The IC1a is connected to the circuit as a buffer. And, the second IC1b is used to provide negative feedback. Capacitor C3 is used to decouple input signals.
Application and Uses
It is used to remove the cross-over distortion. Therefore can be used in the circuits of:
- electronic keyboard
- Theatrical equipment
- Guitars
- Mic
