My Boss DM-2 does not work well with my power supply, whats up with that?
Most older Boss pedals were designed for an unregulated ACA power supply. The ACA adaptor actually puts out about 12V DC, and the old pedals have a diode and resistor inside to reduce this to 9V. When you use a battery in these old pedals, the battery 9V bypasses the diode and resistor so the pedal gets the full 9V. The PSA will not have enough voltage to work right with these pedals. So check your pedal, they originally had a sticker on them telling you which power supply type to use. They also say on the bottom plate if it needs the PSA or ACA. If it says PSA then any regulated power supply (Dunlop, Ibanez, etc) will work. But if it says ACA, then you need to get a boss ACA (ACA120 in the USA) power supply. We sell the ACA supplies also for about $20. The Voodoo labs Pedal Power 2 also has switchable ACA 12V outputs. Note : An ACA type pedal will often work ok on a normal 9V PSA type adaptor IF it is used on a power daisy chain with some normal 9V pedals. This seems really weird, but
