A microphone power supply provides the necessary electrical energy for certain types of microphones, particularly condenser microphones. These microphones require a power source to operate their internal components, which convert sound waves into electrical signals. The power supply can be built into the microphone or provided externally through a battery or phantom power from an audio interface or mixer. Phantom power is a common method used to supply voltage, typically 48 volts, through the microphone cable. This allows for a clean and efficient power transfer without the need for additional cables. Understanding microphone power supplies is essential for achieving optimal audio quality in recording and live sound applications.