How to Convert 12 Volts to 9 Volts

Written by stanley washington
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How to Convert 12 Volts to 9 Volts
Resistors lower the voltage of a power source and can be found on circuit boards. (circuit board image by dwags from

Converting a 12-volt power source to a 9-volt power source can be beneficial if you have a 12-volt power source but need a 9-volt power source. Electrical components are made to resist the flow of electricity and lower the voltage output. These components are called resistors and can be purchased at an electronics speciality store.

Skill level:

Things you need

  • 2 resistors
  • Multimeter
  • Circuit board
  • Soldering iron

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  1. 1

    Meter the device you will be powering with 9 volts with a multimeter. Find the load resistance of the device with the multimeter. Follow the multimeter user's guide to find out how to place the multimeter on its resistance settings.

  2. 2

    Select a resistor.

  3. 3

    Multiply the load resistance by the resistor's resistance. The result is called the parallel resistance. Divide the parallel resistance by 3. This number represents the resistance of the second resistor you will need.

  4. 4

    Install the two resistors on an empty circuit board. One leg from the first and second resistors should touch. Use a soldering iron to install the resistors by soldering or melting the legs of the resistors to the circuit board.

  5. 5

    Connect your 12-volt power source to the resisters by attaching one terminal to each resistor. Attach your device powered by 9 volts to one of the two resistors. The resistor you choose for this does not matter. You can now run a device that is powered by 9 volts from a power source that puts out 12 volts.

Tips and warnings

  • The tip of the soldering iron will be very hot, so do not touch it.

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