Power supplies are devices that produce AC or DC power.

Frequency-to-voltage converters accept a signal and convert its frequency to a corresponding analog voltage level

Frequency-to-current converters accept a frequency (an AC signal) and produce an output current whose value is a function of the input frequency

Power frequency converters take electrical input power at one frequency and voltage and provide electrical output power at a different frequency and at a different or equal voltage

Voltage-to-frequency converters accept a voltage signal and convert its analog level to a signal with a corresponding frequency

DC to AC inverters are used for converting direct current (DC) into alternating current (AC).

AC-DC adapters accept AC input voltage directly from a wall outlet, and output DC voltage