Pedalboard Power Suuply and hum elimination

[bigmufffuzzwizz]

On the Joyo site it SAYS that mini power supply is completely isolated. I think that's the one I've seen before in a shop.
I've wanted to build a power supply for a long time now, just not interested in a big clunky enclosure to fit a ton of transformers. That's a project I could say I really need!