Abstract: A voltage regulator, providing a constant-voltage output through an output terminal, includes an operational amplifier and an output stage driven by an output of the amplifier. A voltage reference is applied to a negative input terminal of the amplifier, and an input voltage, which is greater in magnitude than the output voltage, is applied to the output stage. A first feedback loop returns a signal proportional to the output voltage to the positive input of the amplifier. A second feedback loop extends between the output and input of the amplifier, including resistive and capacitative elements to stabilize the voltage regulator. In a version producing a positive output, the voltage reference applies a positive voltage to the amplifier, and the output stage includes a p-channel power MOSFET device. In a version producing a negative output, the voltage reference applies a negative voltage to the amplifier, and the output stage includes an n-channel power MOSFET device.