Tutorial on Making a Sine Wave Inverter

Sine wave inverters are more complex and costly circuits compared to square wave inverters, but they are suitable for all types of loads including inductive loads, whereas square wave inverters are not suitable for inductive loads. Today we will share the process of making a handmade sine wave inverter.

Materials Required

  • IRFZ44N MOS Tube x 4
  • Heat sink x 1
  • 10 ohm resistors x several
  • Arduino development board x 1
  • 7805 Buck Circuit x 1
  • 3G Tube x 2
  • Dual 12-volt fair transformers x 1
  • 4.7 microfarad 400 volt capacitor x 1
  • Associated wires and connections

Fabrication Steps

Moosetube Installation and Connection

  • Connect two IRFZ44N MOS Tubes in parallel to increase power.
  • Mount the four MOSFETs on the same heat sink.
  • Add an insulating sheet to each mosaic tube to prevent short circuits.
  • Connect a 10-ohm resistor in series with the triode of each mosaic tube for current limiting and damping.

Construction of the driver circuit

  • An Arduino development board was used as the control core.
  • The drive signal from the Arduino is amplified through two 3G tubes, which then drive the mosaic tubes.
  • A 7805 buck circuit is used to convert 12V DC to 5V for Arduino.
  • Connect the D9 and D10 connectors of the Arduino to the driver circuit.
  • Connect 12V power supply for the 3-stage tube.

Transformer connection

  • Use a dual 12-volt fair transformer.
  • The two dual 12-volt taps of the transformer are connected to the drain of each of the two MOS tubes.
  • The 12-volt center tap of the transformer is connected to the input of the 7805.

Installation of Filter Capacitors

  • A 4.7-microfarad 400-volt capacitor is connected in parallel to the 220-volt winding of the transformer for filtering.
  • Program burning
  • The program to control the inverter is burned in advance for the Arduino development board.

Testing and Debugging

  • Use a 220-volt inductive load (such as a cooling fan on a microwave oven) for testing.
  • Make sure that the load works properly when the inverter is connected to 12V DC.


With the above steps, you can make a sine wave inverter for all types of loads. Although it is costly and difficult to make, it is a practical power conversion device for a wide range of applications.

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