A power supply is an essential component of any pedalboard, providing consistent and reliable power to guitar effect pedals. Pedals typically run on 9V DC, though some require 12V, 18V, or even 24V. Using a dedicated power supply rather than batteries or daisy chains helps prevent noise, hum, and power fluctuations, especially in complex setups. High-quality power supplies offer isolated outputs, ensuring each pedal receives clean power without interference. Popular models like the Voodoo Lab Pedal Power series, Cioks DC7, and Truetone 1 Spot Pro are designed to handle multiple pedals efficiently, making them a crucial part of any professional rig.