120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240

120W MOSFET Amplifier Circuit using IRFP240 & IRFP9240
120W MOSFET Amplifier Circuit using IRFP240 & IRFP9240

Introduction

Amplifiers are integral components in audio systems, providing the necessary power to drive speakers and produce high-quality sound. MOSFET amplifiers are known for their efficiency and low distortion, making them popular among audio enthusiasts. In this article, we will discuss a 120W MOSFET amplifier circuit diagram using IRFP240 & IRFP9240 in the output section and 2SC4793, 2SA1837, BD139, MJE340, MJE350, BC547, BC557, 2N5401 in the driver and preamplifier sections.

Specifications of components used in the amplifier circuit:

IRFP240:

  • 20A continuous drain current
  • 200V drain-source voltage
  • 0.075 ohm on-resistance

IRFP9240:

  • 12A continuous drain current
  • 200V drain-source voltage
  • 0.65 ohm on-resistance

2SC4793:

  • 1.5A collector current
  • 160V collector-emitter voltage
  • 25W power dissipation

2SA1837:

  • 1.5A collector current
  • 160V collector-emitter voltage
  • 25W power dissipation

BD139:

  • Collector-Emitter Voltage: 80V
  • Collector Current: 1.5A
  • 12.5W power dissipation
  • Gain: 25-125

2N5401:

  • 600mA collector current
  • 150V collector-emitter voltage
  • 0.625W power dissipation



120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240

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

120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240
120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240
35V power supply Circuit Diagram
35V power supply Circuit Diagram

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 MOSFET Amplifier Circuit using IRFP240 IRFP9240

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

  • IRFP240 MOSFET x 1
  • IRFP9240 MOSFET x 1
  • 2SC4793 Transistor x 1
  • 2SA1837 Transistor x 1
  • BD139 Transistor x 1
  • MJE340 Transistor x 1
  • MJE350 Transistor x 1
  • BC547 Transistor x 3
  • BC557 Transistor x 1
  • 2N5401 Transistor x 3
  • ZY15 Zener Diode x 4
  • 1N4148 Diode x 3




Explanation of 120W MOSFET Amplifier Circuit using IRFP240 IRFP9240

The output section of the amplifier features IRFP240 and IRFP9240 MOSFET transistors, known for their high power handling capabilities and low on-resistance. These transistors are capable of delivering a powerful 120W output while maintaining low distortion levels, making them ideal for high-fidelity audio applications.

In the driver and preamplifier sections, we have used a combination of 2SC4793, 2SA1837, BD139, MJE340, MJE350, BC547, BC557, and 2N5401 transistors. These transistors work together to amplify and modulate the audio signal before it reaches the output stage, ensuring a clean and distortion-free sound reproduction.

Conclusion

The MOSFET amplifier circuit diagram featuring IRFP240 & IRFP9240 in the output section and a combination of 2SC4793, 2SA1837, BD139, MJE340, MJE350, BC547, BC557, and 2N5401 in the driver and preamplifier sections offers a high-quality audio performance with low distortion and high power output. By carefully selecting and integrating these components, audio enthusiasts can build a powerful and efficient amplifier for their audio systems.

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For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240
120W MOSFET Amplifier Circuit Diagram using IRFP240 & IRFP9240
120W MOSFET Amplifier Circuit using IRFP240 & IRFP9240
120W MOSFET Amplifier Circuit using IRFP240 & IRFP9240

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