120W MOSFET Amplifier Circuit Diagram using IRF240 & IRF9240

Introduction

In the world of audio amplification, MOSFET amplifiers have long been favored for their excellent performance and efficiency. Among the various MOSFET amplifier circuits available, the 120W MOSFET amplifier circuit diagram using IRF240, IRF9240 in the output section, BD139, BD140, MPSA42, MPSA92 in the driver section, and BC546B transistors in the preamplifier section is a formidable choice. This circuit design offers a powerful and high-quality audio amplification suitable for a wide range of applications.

Transistor Specifications:

To understand the capabilities and characteristics of the key components used in this circuit, let’s look at the specifications of each:

IRF240:

• Maximum Drain-Source Voltage: 200V
• Continuous Drain Current: 20A
• Total Power Dissipation: 150W
• Gate-Source Threshold Voltage: 2-4V
• On-Resistance: 0.55Ω

IRF9240:

• Maximum Drain-Source Voltage: -200V
• Continuous Drain Current: -12A
• Total Power Dissipation: 65W
• Gate-Source Threshold Voltage: -2.0V to -4.0V
• On-Resistance: 0.85Ω

BD139:

• Collector-Emitter Voltage: 80V
• Collector Current: 1.5A
• Power Dissipation: 8W
• Gain: 25-125

BD140:

• Collector-Emitter Voltage: -80V
• Collector Current: -1.5A
• Power Dissipation: 8W
• Gain: 40-250

BC546B:

• Collector-Emitter Voltage: 65V
• Collector Current: 0.1A
• Power Dissipation: 500mW
• Amplification Factor (hFE): 200-800

120W MOSFET Amplifier Circuit Diagram using IRF240 & IRF9240

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

Caution: Website contains information on high voltage circuits. Proceed at your own risk, ensuring proper knowledge and precautionary measures to prevent electric shock or injury.

More Circuit Layouts

Components List of 120W MOSFET Amplifier Circuit using IRF240 & IRF9240

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

• IRF240 MOSFET x 1
• IRF9240 MOSFET x 1
• BD139 Transistor x 1
• BD140 Transistor x 1
• MPSA42 Transistor x 1
• MPSA92 Transistor x 1
• BC546B Transistor x 3
• 1N4148 Diode x 5
• BZX84C12 Zener Diode x 2

Explanation of 120W MOSFET Amplifier Circuit using IRF240 & IRF9240

The 120W MOSFET amplifier circuit is built around the IRF240 and IRF9240 MOSFETs, which are renowned for their excellent performance and reliability. These MOSFETs are responsible for delivering the power to drive the speakers and provide a clean and distortion-free audio signal. Additionally, the BD139, BD140, MPSA42 and MPSA92 transistors in the driver section enhance the signal before it reaches the output stage, ensuring optimal audio quality.

Preamplification plays a crucial role in audio amplification, and the BC546B transistors in the preamplifier section of this circuit contribute to delivering a high-fidelity audio signal. These transistors work efficiently to achieve low noise and distortion levels, making them a valuable addition to the overall circuit design.

Conclusion

The 120W MOSFET amplifier circuit diagram using IRF240, IRF9240, BD139, BD140, and BC546B transistors offers a solid foundation for high-quality audio amplification. The combination of these components ensures excellent performance, efficiency, and low distortion levels. With the IRF240 and IRF9240 delivering the power, the BD139 and BD140 enhancing the signals, and the BC546B contributing to low noise and distortion, this circuit is a reliable choice for audio enthusiasts and professionals seeking high-fidelity sound reproduction.

The optimized design in this article aim to provide a clear understanding of the 120W MOSFET amplifier circuit‘s capabilities and specifications. By harnessing the power of the IRF240, IRF9240, BD139, BD140, and BC546B transistors, audio enthusiasts can enjoy a powerful and crystal-clear audio experience. So, whether you are a hobbyist, an audio professional, or a music lover, this MOSFET amplifier circuit will undoubtedly meet your audio amplification needs and exceed your expectations.

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