140W Audio Amplifier Circuit Diagram using TIP142 & TIP147

Introduction

In the world of audio enthusiasts, finding the perfect amplifier for your speakers is essential. A powerful and efficient audio amplifier can help you achieve that desired booming sound that you’ve always craved. In this article, we will explore a 140W audio amplifier circuit diagram that utilizes several transistors, including the TIP142, TIP147, BD139, 2SC3116 and BC556. These transistors, when used in conjunction, can provide an excellent audio amplification solution for your audio system.

Specifications of TIP142 and TIP147 Transistors:

The TIP142 and TIP147 transistors are commonly used for power amplification purposes and exhibit impressive specifications. The TIP142 is an NPN transistor, while the TIP147 is its complementary PNP counterpart. Here are the specifications for both transistors:

TIP142 NPN Power Transistor:

• Collector current (Ic): 10A
• Collector-emitter voltage (Vce): 100V
• Power dissipation (Pd): 125W
• DC current gain (hFE): 25 to 100

TIP147 PNP Power Transistor:

• Collector current (Ic): 10A
• Collector-emitter voltage (Vce): 100V
• Power dissipation (Pd): 125W
• DC current gain (hFE): 25 to 100

140W Audio Amplifier Circuit Diagram

This project can be built using a few basic components. The circuit diagram of this project is shown below.

More Circuit Layouts

Components List of 140W Audio Amplifier Circuit Diagram

Following is the list of all components used in this project:

• TIP142 Transistor x 1
• TIP147 Transistor x 1
• BD139 Transistor x 1
• 2SC3116 Transistor x 1
• BC556 Transistor x 2
• 0.22Ω/5W Resister x 2
• 680Ω Resister x 1
• 33Ω Resister x 1
• 2.7k Resister x 2
• 1k Resister x 1
• 47k Resister x 2
• 10k Resister x 2
• 4.7k Resister x 1
• 1.5k Resister x 1
• 1uF Capacitor x 1
• 47uF Capacitor x 1
• 100pF Capacitor x 1
• 100uF Capacitor x 1
• 15V Zener Diode x 1
• 24V to 45V Power Supply
• 4Ω Speaker

Working Explanation

The 140W audio amplifier circuit diagram featured in this article incorporates the TIP142 and TIP147 transistors, along with the BD139, 2SC3116, and BC556 transistors. The circuit diagram follows a class AB amplifier configuration, which ensures high-quality sound reproduction with low distortion levels.

To build this amplifier, you will need a power supply capable of providing approximately 24- 45 volts of DC voltage. The input signal is then fed through an audio preamplifier stage, which boosts the signal level and provides the necessary gain.

The TIP142 and TIP147 transistors play a crucial role in the amplifier circuit. These high-powered NPN and PNP transistors, respectively, provide the necessary push-pull configuration for driving the speakers with high power. Their ability to handle high currents and voltages makes them ideal for audio amplifier applications.

Conclusion

The 140W audio amplifier circuit diagram discussed in this article showcases the utilization of high-powered transistors like the TIP142, TIP147, BD139, 2SC3116, and BC556 to achieve excellent audio amplification results. This circuit can provide a powerful and clean sound output for your audio system, making it a go-to option for audio enthusiasts.

By following the provided circuit diagram and specifications for the TIP142 and TIP147 transistors, you can successfully build a robust audio amplifier for your speakers. Remember to ensure a suitable power supply capable of providing the required voltage and current, and enjoy the immersive sound experience that this amplifier can provide.

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