How to Assemble a 12VDC to a 220V AC Inverter

Written by david sandoval
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How to Assemble a 12VDC to a 220V AC Inverter
The transistors, when used in conjunction with a capacitor, will create an AC signal when voltage is applied to the circuit. (transistor image by Alex from Fotolia.com)

A power inverter is used to convert DC electrical power into AC electrical power. These devices are commonly used to provide household electrical power from a lead-acid or other high-capacity battery. Most corded electronic devices sold in North America require a voltage between 110 and 125 volts AC. However, devices sold for use in other parts of the world require between 220 and 240 volts AC to operate. A transformer can be wired into an inverter circuit that would normally be used for North America to "step up" the voltage for such devices.

Skill level:
Easy

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Things you need

  • Electrical wire
  • Electrical pliers
  • Electronic solder
  • Soldering iron
  • Two-prong electrical socket
  • Screwdriver
  • 2, resistors, 82 Ohm
  • 2 resistors,820 Ohm
  • 2 bipolar junction (PNP) transistors
  • Electrolytic capacitor (1 microfarad or larger capacity)
  • 1 transformer, 24V/120V (must be centre-tapped on the 24V side)
  • 1 transformer,120V/240V
  • Crimp-type spade terminal connectors
  • 12V lead-acid battery with L-type terminals
  • 2 machine screws (size 10-32, one inch long)
  • 2 machine nuts (size 10-32)

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Instructions

  1. 1

    Cut ten equal-size lengths of electrical wire, and strip 1/2 inch of insulation from each end.

  2. 2

    Crimp a spade terminal to one end of the first wire. Crimp a spade terminal to one end of the second wire.

  3. 3

    Place the stripped end of the first wire on one of the 240V side terminals of the 120V/240V transformer. Melt a small drop of solder to the terminal and the wire jointly. Smooth the solder out so that the joint is shiny and contains no lumps. In this same manner, solder the stripped end of the second wire to the remaining 240V side transformer terminal.

    How to Assemble a 12VDC to a 220V AC Inverter
    The 120V sides of both transformers must be electrically connected. (transformateur électrique image by Lounatiq from Fotolia.com)
  4. 4

    Loosen the screws on both sides of the electrical socket. Place the spade terminal from the first wire into the gap under the screw on the right side, and then tighten the screw to hold the spade terminal firmly to the outlet. Place the spade terminal from the second wire under the head of the screw on the left side, and tighten the screw to hold the spade terminal firmly.

    How to Assemble a 12VDC to a 220V AC Inverter
    Sample 220V AC outlet. (outlet image by dinostock from Fotolia.com)
  5. 5

    Solder one end of the third wire to one of the terminals on the 120V side of the 120V/240V transformer. Solder the other end of this wire to one of the terminals on the 120V side of the 24V/120V transformer. Solder one end of the fourth wire to one of the terminals on the 120V side of the 120V/240V transformer. Solder the other end of this wire to one of the terminals on the 120V side of the 24V/120V transformer.

  6. 6

    Solder one end of the fifth wire to one of the terminals on the 24V side of the 24V/120V transformer. Solder one end of the sixth wire to the remaining terminal on the 24V side of the 24V/120V transformer. Solder one end of the seventh wire to the 24V transformer centre tap.

  7. 7

    Twist together one of the leads from the first 820-Ohm resistor, the negative lead from the capacitor, and the loose end of the fifth wire. Solder this joint to the collector lead on the first transistor.

  8. 8

    Twist together one of the leads from the second 820 Ohm resistor, the positive lead from the capacitor, and the loose end of the sixth wire. Solder this joint to the collector lead on the second transistor.

  9. 9

    Twist together one end of the eighth wire with the free lead from the first 820-Ohm resistor. Twist together one end of the ninth wire with the free lead from the second 820-Ohm resistor.

  10. 10

    Twist together one of the leads from the first 82-Ohm resistor with the free end of the eighth wire. Solder this wire pair to the base lead on the second transistor.

  11. 11

    Twist together one of the leads from the second 82-Ohm resistor with the free end of the ninth wire. Solder this wire pair to the base lead on the first transistor.

  12. 12

    Twist together the unoccupied leads from both 82-Ohm resistors with one end of the tenth wire. Solder the wire joint to the emitter leads on both transistors.

  13. 13

    Crimp a spade terminal to the loose end of the tenth wire. Insert one of the screws through the spade terminal into the positive battery terminal hole. Screw on one of the machine nuts to hold the spade terminal snugly to the battery terminal.

  14. 14

    Crimp a spade terminal to the loose end of the seventh wire. Insert the remaining screw through the spade terminal into the negative battery terminal hole. Screw on one of the machine nuts to hold the spade terminal snugly to the battery terminal.

  15. 15

    To use the power inverter, plug the 220V device into the electrical socket.

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