The Mission Engineering 529 USB Power Converter is my favorite power supply. It uses a 5V USB power source so you can power it with any old phone charger. Because it uses USB power, the entire guitar pedalboard can be powered from a USB battery. The battery that comes with it will power a pedalboard for up to 20 hours. Personally, I use a wireless cable system with my guitar, so having the ability to put my board anywhere on the stage is awesome, regardless of how far away I am from an available outlet. It is also the perfect power supply in a studio setting because you don’t have to worry about 60hz hum because pedals are not a part of the main room power. You don’t have to worry about being plugged into the same circuit as the lights or something else that creates a power buzz.
I’ve been using the Mission Engineering Power supply for the past three week… four rehearsals and three live performances and it has performed flawlessly. I love how it fits under my tiny pedalboard perfectly. I highly recommend this to anyone interested who wants to go wireless, has a power hum they need to get rid of, and needs a small power supply.
missionengineering.com