A DC battery powered sound effect pedal housing with sound effect circuitry mounted therein and a battery terminal connector for being connected to battery terminals for powering the circuitry, a base and an adapter frame removably mounted intermediate the housing and the base with the adapter having said frame and an adapter power cord mounted to frame for transmitting DC power to the battery terminal connector whereby a conventional DC battery power sound effect pedal is converted to one being powered from an online AC power source without physically changing the base and housing. A convention power cord is used be powered from an AC power source to provide a DC power output that is plugged into the jack of the adapter power cord.