isolated power supply

An isolated power supply is a pedalboard power source that converts wall voltage to the power each pedal needs, with each output kept electrically separate¹. It works by using a transformer, or multiple transformers, to keep every power outlet completely electrically isolated². True isolation effectively gives every pedal on a board its own dedicated power source, which stops noise from jumping between pedals³. Without one, noise from a problem pedal can work its way into the electrical ground and propagate into other pedals in the signal chain⁴. Many pedal makers specify or recommend isolated supplies for powering their pedals⁵⁶⁷.