How to make an electrical step-up transformer from 12 volt to 24 volt

Written by isaac mckinney
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How to make an electrical step-up transformer from 12 volt to 24 volt
A step-up transformer increases the voltage while increasing current. (transformateur électrique image by Lounatiq from

A step-up transformer increases the voltage when electricity passes from one coil to another. The primary core receives electricity and transfers the power to the core. The core is made of magnetic material---usually iron---and transfers the electricity to the secondary coil through a process called electromagnetic induction. The secondary coil must have more turns than the primary core to increase the voltage.

Skill level:

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Things you need

  • Power drill
  • Two regular-length flat steel bars
  • Two short-length flat steel bars
  • Electrical tape
  • Four steel Bolts
  • 28-gauge insulated wire
  • 12-volt alternating current (AC) power supply

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  1. 1

    Drill bolt holes at the ends of all four steel bars.

  2. 2

    Wrap the two regular-length steel bars with electrical tape.

  3. 3

    Wrap the two regular length steel bars with wire. The secondary coil should have double the turns of the primary coil to change 12 volts to 24 volts.

  4. 4

    Bolt the short steel bars to the other two bars, making a rectangle.

  5. 5

    Connect the AC power supply to the primary coil.

Tips and warnings

  • Don't confuse the AC power supply with and AC power adaptor. The AC power adaptor changes AC current to direct current (DC). For the transformer to work, the current must remain AC.
  • Do not plug the transformer directly into an outlet. The transformer cannot handle high voltage.

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