The Roland Boss DD20 Gigadelay causes power problems for a lot of people on many different voltage adapters. It is most happy on its own power supply but with a few circuit changes, the AMZ power supply can provide the needed voltage to the pedal.
Since we don’t know what is inside the DD-20 on the power supply input, we can only guess about the design and what is causing the problems. It seems the pedal is creating instability with the regulators, likely by setting up a high frequency oscillation that causes overheating and eventual shutdown.
A few modifications can adapt the power supply to work with the Boss pedal and a complete description of the mods is included with the technical material supplied with the power supply pcb purchase.
The mod has been tested and verified to work with the Boss pedal.
