30W MOSFET Amplifier Circuit Diagram DIY


In this article, we will discuss a do-it-yourself (DIY) circuit diagram for a 30W MOSFET amplifier using IRF530 and IRF9530 transistors. This circuit is simple to build and can deliver excellent audio output quality. By using high-quality components and following the circuit design carefully, you can create a powerful audio amplifier that is suitable for various applications.

Specifications of IRF530, IRF9530, and BC550 Transistors

  1. IRF530:
  • Power MOSFET
  • N-channel type
  • Vds (Drain-Source Voltage) – 100V
  • Id (Continuous Drain Current) – 14A
  • Rds(on) (On-Resistance) – 0.16Ω
  • Fast switching speed
  • Thermal shutdown protection
  1. IRF9530:
  • Power MOSFET
  • P-channel type
  • Vds (Drain-Source Voltage) – -100V
  • Id (Continuous Drain Current) – -12A
  • Rds(on) (On-Resistance) – 0.3Ω
  • Logic level compatible
  • High-speed switching capabilities
  1. BC550:
  • NPN general-purpose transistor
  • Low noise and high gain
  • Vceo (Collector-Emitter Voltage) – 45V
  • Ic (Collector Current) – 100mA
  • Hfe (DC Current Gain) – 420 (minimum)
  • Suitable for low-power amplification applications

MOSFET Amplifier Circuit Diagram

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

30W MOSFET Amplifier Circuit Diagram
30W MOSFET Amplifier Circuit Diagram
30V Power Supply Single Pole
30V Power Supply Single Pole

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

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

  • IRF530 MOSFET x 1
  • IRF9530 MOSFET x 1
  • BC550 NPN Transistor x 1
  • 330Ω Resister x 2
  • 100Ω Resister x 1
  • 1k Resister x 1
  • 2.2k Resister x 1
  • 27k Resister x 1
  • 2.2k Trimmer & Pot x 2
  • 220uF Capacitor x 1
  • 100uF Capacitor x 2
  • 22uF Capacitor x 1
  • 40V Single Power Supply

Explanation of MOSFET Amplifier Circuit Diagram

The circuit diagram of the 30W MOSFET amplifier is based on a complementary push-pull configuration utilizing the IRF530 and IRF9530 power MOSFETs. These MOSFETs have been chosen for their outstanding performance in audio amplification. The amplifier operates in Class AB mode and can deliver up to 30 watts of power.

The input stage of the amplifier consists of a BC550 transistor, which acts as a voltage amplifier. The BC550 transistor is a general-purpose NPN transistor known for its low noise and high gain characteristics. It ensures a clean and accurate amplification of the audio signal from the input source.

The output stage of the amplifier is the complementary push-pull stage formed by the IRF530 and IRF9530 MOSFETs. The IRF530 is a powerful N-channel MOSFET, while the IRF9530 is a complementary P-channel MOSFET. This configuration helps in producing a balanced and efficient amplification of the audio signal.


The 30W MOSFET amplifier circuit diagram using IRF530 and IRF9530 MOSFETs, along with the BC550 transistor, provides a reliable and high-quality audio amplification solution. By following the circuit diagram carefully and using high-quality components, you can build a powerful amplifier capable of delivering up to 30 watts of audio power. The MOSFETs’ specifications ensure a balanced and efficient amplification, while the BC550 transistor provides accurate voltage amplification. Enhance your audio experience by constructing this DIY amplifier and enjoy excellent audio output quality.

More projects, You may like:

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!

30W MOSFET Amplifier Circuit Diagram
30W MOSFET Amplifier Circuit Diagram
30V Power Supply Single Pole
30V Power Supply Single Pole

Thank you for visiting the article.

(Visited 759 times, 6 visits today)

Leave a Reply

Your email address will not be published.