Moogerfoogers require a +9 volt DC power supply that can supply at least 200 milliamperes (mA) of current. In addition, the tip of the plug must be positive. Some manufacturers’ power adapters use a negative tip. The moogerfooger circuitry is protected against accidental damage due to the use of an adapter with the wrong polarity. Never use an adapter whose output voltage exceeds 15 volts. Doing so can damage the circuitry in the moogerfooger. Most adapters are labeled with voltage and current specifications and a polarity diagram.