How do you convert 12 volts to 3 volts?

Stepping down AC voltage To step down 12 VAC to 3 VAC, you could use a step-down transformer with a winding ratio of 4:1 between primary and secondary Stepping Down DC Voltage There are a number of ways one can step down 12 VDC to 3 VDC, but they basically fall into three categories: Unregulated voltage dividers Linear voltage regulators Switching voltage regulators Voltage Dividers A voltage divider is two or more resistors connected in series with a power source, which causes the voltage to be divided between them. For example, if you were to connect a 30 ohm and a 10 ohm resistor in series across a 12 volt supply, the voltage across the two resistors would be 9 volts and 3 volts, respectively: V T 12 V R 1 R 2 12V----| 30 ohm |--------+3V----------| 10 ohm |-------Ground V R1 9V-------------------------V R2 3V R T R1 + R 2 V R1 V T R 1 R.

For doubling the AC voltage, use a 1 to 2 step up transformer For doubling the DC voltage use 2 of the 12 V car batteries und connect them in series.

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