400 w Class D Amplifier Circuit and PCB Layout

Hello welcome back to the latest topic of 400 W Class D amplifier Circuit diagram and also the PCB Layout. here i’m sharing two circuit with same functions and working. Both of the class d amplifiers are same with few differences. Build your own Class D amplifier.

What is Class D Amplifier

The Class D amplifier or the switching amplifier is an electronic device, in which the amplifying the signals input. This circuits are usually operated by the transistors or Mosfets. The Class D circuits are designed with highest efficiency but it is not quite high fidelity.

The class D amplifier also known as digital amplifiers, working by shifting the sample frequency into extremely high frequency. The major concern with this type of amplifier is they don’t offer same fidelity as like the linear amplifier.

Class D Amplifier Circuit Diagram

400w class d amplifier circuit diagram
400w class d amplifier circuit figure 1
400w class d amplifier circuit
400w class d amplifier figure 2

PCB Layout Top

400w class d amplifier pcb top view
PCB top view
400w class d bottom pcb layer
400w class d bottom pcb layer

Components List

  1. 1×LM311N IC.
  2. 1×IR2153 IC.
  3. 1×MJE350 Transistor.
  4. 1×MJE13005 Transistor.
  5. 2×IRFP260N MOSFET.
  6. 2×3.3KΩ resistor 1/4W.
  7. 2×33KΩ resistor 1/4W.
  8. 3×1KΩ resistor 1/4W.
  9. 1×5.1KΩ resistor 1/4W.
  10. 1×15KΩ resistor 1/4W.
  11. 2×10Ω resistor 1/4W.
  12. 1×4.7KΩ resistor 1/4W.
  13. 2×2.2 – 4.7KΩ resistor 1W.
  14. 2×Zener Diode 1N4740/ 1N4742 1W (10V/ 12V). 15. 1×Zener Diode 1N4744 15V 1W.
  15. 2×Zener Diode 1N4148.
  16. 1× Ultra Fast Diode SF16/ FR107.
  17. 6×0.1uF (104) capacitor 50V/ 100V.
  18. 1×0.001uF (102) capacitor 50V/ 100V.
  19. 1×100pF (101) capacitor 50V/ 100V.
  20. 1×0.0022uF (222) capacitor 50V/ 100V.
  21. 3×1uF (105) capacitor 250V/ 400V.
  22. 3×47uF capacitor 63V.
  23. 1×4.7uF capacitor 63V.
  24. 2×10uF capacitor 63V.
  25. 5×6.3 mm ver�cal PCB terminal.
  26. 1×2 pin connecter base 2.54 mm.
  27. 1×35uH Coil.
  28. 2×1000uF capacitor 63V.
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  2. Bueno no es que sea aguafiestas pero ya lo vi este circuito y no es realmente de 400w apenas llega a 120w por qué en primer lugar solo lleva un par de MOSFET y llegar a esa potencia mencionada de e 400w es difícil saludos

  4. I am planing to make an amp with this board for car PA system. For using 8 inch 8 ohms 100 w midbass 3 no speakers in parallel. power supply is 12 v to 40 0 40 volt converter and 100ah battery .2 channels

  6. Thanks for your class D amp enthusiast design, you are brilliant. Anyway, is this project already tested? can you show the amp is working?
    Thank you.