Fulltone IPS18 18v Noise Free Power Supply with Negative Center Pin
The first Noise-Free "switching" power suppliy for pedals! These can be used in any country, at any voltage from 100-240VAC.
Other switching type adapters hum and worse, have a droning synth-like noise due to the use of a cheap IC-type regulator. I designed the Fulltone IPS-18 to be Noise-Free, and gave it plenty of available current; 500ma for the IPS-18.