Build A 120v Ac To 12v Dc Power Converter

You will need an electrical cord with a two-prong plug.

Although many electrical devices plug into a wall outlet, not all of these devices can directly use the power that the outlet provides. Often, the wall outlet power (120 volts AC in North America) must be converted into a different form so that the electrical device can operate correctly. One of the most common voltage conversions in use is the transition from 120 volts AC to 12 volts DC. This conversion typically requires a step-down AC transformer to reduce the voltage, and a rectifier to convert the AC signal into DC power.

Instructions

1. Cut four lengths of electrical wire. Strip half an inch of insulation from each wire end.

2. Crimp one of the ring terminals to one end of the first wire. Crimp the other ring terminal to one end of the second wire.

3. The cathode lead of a diode (component at right) is marked with a line across the diode case.

Twist together the cathode leads from both the first and second diodes with the unoccupied end of the first wire. Solder the three-way connection.

4. Twist together the anode leads from both the third and fourth diodes with the unoccupied end of the second wire. Solder the three-way connection.

5. Solder one end of the third wire to one of the terminals on the transformer secondary. Solder one end of the fourth wire to the remaining lead on the transformer secondary.

6. Twist together the cathode lead from the third diode, the anode lead from the first diode, and the unoccupied end of the third wire. Solder the three-way connection.

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7. Twist together the cathode lead from the fourth diode, the anode lead from the second diode, and the unoccupied end of the fourth wire. Solder the three-way connection.

8. Pull apart the wire ends of the electrical cord until there is a six-inch separation between the wire tips. Remove half an inch of insulation from each wire tip.

9. Solder one of the wire ends of the electrical cord to one of the terminals on the transformer primary. Solder the remaining wire end to the remaining transformer primary terminal.

10. Plug the electrical cord into a wall outlet. The ring terminal at the end of the first wire is the positive DC output; the ring terminal at the end of the second wire is the negative DC output.