If you only have one pedal to power, then a 9v 800ma centre negative single power supply is the perfect power supply for powering a single guitar effect pedal.

The 9v adapter is also ideal as a single power supply for many other musical instruments that require a centre negative supply.

When looking for a replacement power supply unit (PSU) for any device, you will need to determine what power supply unit is compatible with your equipment. Many can be used across different effects pedals. Find out the type and size of the connector plug, the voltage, and the amperage and in the case of direct current (DC), you will need to know the polarity. Buying the wrong one will damage your equipment and void any warranty.

Voltage information is usually found on the equipment right next to the power supply input socket, the product manual, or the manufacturer's website. Often it is stamped on the casing where the PSU is inserted. There may be a small sticker elsewhere on the case with the voltage & polarity information.

Suitable for many Guitar pedals & musical instruments.