JOYO JP-905 9V 500mA Guitar Pedal Power Adapter, Center-Negative

A center-negative 9V DC output makes the JOYO JP-905 a practical way to power a compatible guitar effects pedal from an AC outlet. Its 500mA output supports pedals whose required current is 500mA or less, so you can match the adapter to the pedal’s power specifications.

The 5.5 x 2.1mm barrel connector fits pedals that use that plug size, while the 4.92ft cord gives you room to position the adapter near your playing setup. The design is intended for most pedals with matching voltage, polarity, and connector requirements.

For a single pedal or a simple setup, this individual adapter offers a direct alternative to changing batteries. Check the pedal’s power marking before connecting it, voltage, polarity, plug size, and current requirement all matter.

What matters most

The key detail is the combination of 9V DC, center-negative polarity, and 500mA output. The adapter is suitable for a pedal that calls for 9V with a center-negative connection and draws no more than 500mA. Its 5.5 x 2.1mm barrel plug provides another specific match to check against the pedal’s DC input. These details help you choose a supply based on the actual power requirements rather than relying on a brand name or appearance alone.

The adapter accepts AC 100–240V at 50–60Hz and provides 4.5W of output. Its cable uses low-impedance pure copper wire and a PVC covering, the built-in IC components are designed for noise reduction and short-circuit protection. Buyers particularly praise its build and power delivery, while feedback about noise is mixed, so the most useful starting point is still a careful match with the pedal’s power requirements.

Size & fit

The barrel connector measures 5.5 x 2.1mm, and the cord is 4.92ft long. Those measurements help determine whether the plug will fit the pedal and whether the cable can reach from the outlet to your board or playing area. The adapter is designed for guitar effects pedals that use a 9V center-negative input, it is not a universal substitute for supplies with different voltage, polarity, connector, or current requirements.

Unlike a multi-output pedalboard power supply, this is a single-output wall adapter. That makes it a straightforward choice for powering one compatible pedal, whether it is placed beside an amp or used as part of a compact practice setup.

How to use it

Before connecting the adapter, check the symbol and power rating by the pedal’s DC jack or in its manual. Confirm that the pedal requires 9V DC, center-negative polarity, a 5.5 x 2.1mm barrel connector, and 500mA or less. If those specifications match, connect the barrel plug to the pedal and the adapter to a suitable AC outlet. This quick check helps avoid using a supply with the wrong polarity or voltage.

For a practice session, the adapter can power a compatible pedal without relying on its battery. It can also suit a simple playing setup where one pedal needs its own wall supply rather than a shared multi-output unit.

Questions before you buy

Will it power a pedal that needs more than 500mA? No. The output is rated at 500mA, choose a supply rated for at least the pedal’s stated current requirement.

Does the pedal need center-negative polarity? Yes. The adapter is center-negative, so the pedal’s power marking must show the same polarity.

What input voltage does the adapter accept? Its stated input is AC 100–240V, 50–60Hz. Match the output requirements at the pedal as well as the adapter’s input to your power setup.

Buying verdict

The JOYO JP-905 is a practical fit for players who need a dedicated wall adapter for a 9V center-negative pedal with a 5.5 x 2.1mm input and a current requirement of 500mA or less. Its clearly defined output and 4.92ft cord make it easy to assess for a home practice space or a straightforward pedal setup.