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440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors with PCB


Fig. 1 - 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors with PCB


This is a high performance power amplifier, which despite its simplicity in construction, in the tests performed, it presented parameters with great results, very close to what we call a HI-FI amplifier.

The Circuit Works

The complexity of the circuit is at an advanced level, it is not recommended for those who don't have experience in electronics and in assembling amplifier circuits, you must have minimal knowledge at an advanced level to assemble this type of power amplifier.

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The circuit diagram of the power amplifier is shown in Figure 2 below. It uses 8 output Mosfet power transistors, 4 transistors for the positive cycle and 4 transistors for the negative cycle. 

Fig. 2 - Schematic diagram 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors 

The input circuit consists of a TL431 Op-Amp, it is used as a feed-forward preamplifier for the driver circuit units that produce a primary voltage gain at the output stage.

The circuit is divided into 2 identical half-cycles: one side for the positive half-wave of the signal fed through driver transistor Q1 NPN BD139, which feeds the output transistors (Q3, Q5, Q7, Q9 ) P-Channel IRFP9240, the other side for the negative half-wave of the signal fed through driver transistor Q2 PNP BD140, which feeds the output transistors (Q4, Q6, Q8, Q10) N-Channel IRFP240.

The Power Supply 

The power supply is of the symmetrical type, with a supply voltage of +55V | 0V | -55V, with a current of 10 Amperes, with good filtering. 

In Figure 3 below, we have a suggestion for a power supply that we use in our projects. In this article, besides having the schematic diagram with the Printed Circuit Board, you will understand how to easily calculate your own Power Supply, with the desired voltage.

You can in the link below:

Fig. 3 - Symmetrical Power Supply for Power Amplifiers

Components List

  • Semiconductors
    • U1 .......................... TL071 Integrated Circuit
    • Q1 .......................... BD139 NPN Transistor
    • Q2 .......................... BD140 PNP Transistor
    • Q3, Q4, Q5, Q6 ..... IRFP9240 Mosfet Transistor
    • Q7, Q8, Q9, Q10 ... IRFP240 Mosfet Transistor
    • D1, D2 ................... 1N4744 15V Zener diode
      D3, D4 ................... 1N4148 diode

  • Resistor
    • R1, R33 ................. 47KΩ (yellow, violet, orange, gold
    • R2 .......................... 1KΩ  (brown, black, red, gold)
    • R3, R4 .................... 2K7Ω (red, violet, red, gold)
    • R5, R6 .................... 2KΩ (red, black, red, gold)
    • R7 ........................... 6k8Ω Trimpot 
    • R8, R9 .................... 22KΩ (red, red, orange, gold)
    • R10, R11 ................ 33Ω (orange, orange, black, gold)
    • R12, R13 ................ 220Ω (red, red, brown, gold)
    • R14, R5 .................. 820Ω ( grey, red, brown, gold)
    • R16 ......................... 3.3Ω (orange, orange, gold, gold)
    • R17, R18, R21, R22, R25, R26, R29, R30 .... 39Ω (orange, white, black, gold)
    • R19, R20, R23, R24, R27, R28, R31, R32 .... 0.33Ω (orange, orange, silver, gold)
  • Capacitor
    • C1, C5 .................... 100pF Ceramic Capacitor
    • C2, C6, C7 .............. 1uF Ceramic Capacitor
    • C3, C4, C9, C10 ..... 470uF / 65V Electrolytic Capacitor 
    • C8 ........................... 100nF Ceramic Capacitor


  • Miscellaneous 
    • P1 .......... 2-pin PCB soldering terminal blocks
    • P2 .......... 3-pin PCB soldering terminal blocks
    • Others .... Printed Circuit Board, heat sink, wires, etc.


We are offering the PCB - Printed Circuit Board, in GERBER, PDF and PNG files, for you who want to do the most optimized assembly, either at home, or if you prefer in a company that develops the board, you can is downloading and make the files in the Download option below.
Fig. 3 - 440W Class AB Power Amplifier using Mosfet IRFP9240 and IRFP240 Transistors

Files to Download, Direct Link:

Click on the link beside: GERBER, PDF and PNG files

If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.

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My Best Regards!!!


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