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.
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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