Here is a voltage converter capable of transforming 9v into 18v. Plug 9v from your power supply into the input (white jack), then use the transformed 18v at the output (red jack) to power a pedal capable of receiving 18v. Increasing the voltage that powers a pedal increases the headroom and can change some characteristics of the sound as well.
Features: -1590a enclosure. -Color coded in and out DC jacks. -Power filtering. -Max current draw of 40mA. -Reverse polarity protection. -Compatible with standard negative center 9v adapters. Run only at 9v.
*Disclaimer* If a pedal isn't marked with 18v at the DC input I strongly advise that you throughly research if that pedal is capable of receiving 18v. I can not and will not be responsible for mismatched voltage leading to the death of a pedal.
Handmade with love in the USA using hand picked and hand matched components of exceptional quality.