MOSFET Audio Amplifier Circuit Diagram using IRF530 & IRF9530

Introduction

In the world of electronics, amplifiers play a crucial role in enhancing the signal strength and quality of audio equipment. MOSFET amplifiers are known for their high power efficiency and superior performance. In this article, we will discuss a 50W MOSFET amplifier circuit diagram that utilizes IRF530 and IRF9530 MOSFETs in the output section, BD139 and BD140 transistors in the driver section, and BC560C transistors in the preamplifier section. This circuit promises to deliver a powerful and clean audio output, making it an excellent choice for various audio applications.

Specifications of Transistors:

IRF530:

• Type: N-Channel MOSFET
• Maximum Drain Current: 14A
• Voltage Rating: 100V

IRF9530:

• Type: P-Channel MOSFET
• Maximum Drain Current: 12A
• Voltage Rating: 100V

BD139:

• Type: NPN Transistor
• Maximum Collector Current: 1.5A
• Voltage Rating: 80V

BD140:

• Type: PNP Transistor
• Maximum Collector Current: 1.5A
• Voltage Rating: 80V

BC560C:

• Type: PNP Transistor
• Maximum Collector Current: 100mA
• Voltage Rating: 45V

MOSFET Amplifier Circuit Diagram using IRF530 & IRF9530

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 Diagram using IRF530 & IRF9530

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

Transistors:

• BC560C Transistor x 5
• BD140 Transistor x 1
• BD139 Transistor x 1
• IRF530 MOSFET x 1
• IRF9530 MOSFET x 1

Resisters:

• 47K Resister x 2
• 4.7K Resister x 1
• 1.5K Resister x 1
• 390Ω Resister x 1
• 470Ω Resister x 1
• 33K Resister x 1
• 150K Resister x 1
• 15K Resister x 1
• 27Ω Resister x 1
• 10Ω Resister x 3
• 220Ω Resister x 2
• 8.2Ω-2W Resister x 1
• 22Ω-5W Resister x 1
• 500Ω-1/2W Trimmer x 1

Capacitors:

• 470nF Capacitor x 1
• 330pF Capacitor x 1
• 470µF-63V Capacitor x 2
• 100nF-63V Capacitor x 4
• 100µF Capacitor x 1
• 10pF Capacitor x 1
• 1µF Capacitor x 1

• ±35V Symmetrical Power supply

Explanation of MOSFET Amplifier Circuit using IRF530 & IRF9530

The 50W MOSFET amplifier circuit comprises several crucial components like IRF530 & IRF9530 that work together to amplify the audio signal. Let’s examine the different sections of this amplifier circuit:

Preamplifier Section: The preamplifier section is responsible for amplifying the weak audio signals obtained from input sources such as microphones or line-level devices. In this circuit, BC560C transistors are used for the preamplifier stage. These transistors provide low noise amplification and excellent linearity, resulting in a clear and accurate audio signal.

Driver Section: The driver section acts as an intermediary between the preamplifier and output stage. BD139 and BD140 transistors are employed in this section to amplify the signal provided by the preamplifier stage. These transistors offer high power dissipation capabilities and excellent frequency response, enabling seamless signal transfer to the output section.

Output Section: The output section is where the power amplification takes place. Here, IRF530 and IRF9530 MOSFETs are utilized to amplify the audio signal to the desired power level. IRF530 is an N-Channel MOSFET with a maximum drain current rating of 14A, making it suitable for high-power applications. IRF9530, on the other hand, is a complementary P-Channel MOSFET with a maximum drain current rating of 12A, ensuring efficient power amplification.

Conclusion

The 50W MOSFET amplifier circuit diagram discussed in this article demonstrates the effective utilization of IRF530 and IRF9530 MOSFETs in the output section, BD139 and BD140 transistors in the driver section, and BC560C transistors in the preamplifier section. By combining these high-quality components, this amplifier circuit provides excellent power efficiency, low distortion, and accurate signal amplification for various audio applications. Whether you are an audio enthusiast or a professional audio system designer, this MOSFET amplifier circuit offers a reliable and powerful solution to enhance your audio experience.

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