BOSS PSA-240 AC / DC power supply (PSU).

BOSS 9v DC guitar pedals power supply and bass guitar pedals power supply. The BOSS PSA240 power supply  is DC regulated and smoothed to supply power for BOSS guitar effects pedals.

The BOSS PSA-240 AC/DC regulated power supply converter (PSU) converts UK mains voltage to DC 9v for most BOSS guitar and bass guitar effects pedals, stomp boxes and for some other Roland and BOSS products. The PSA240 power supply (PSU) output is regulated and smoothed. The voltage and current are constant with almost no hum.

A DC power supply with low hum is essential for guitar effects pedals, especially distortion pedals. Humbucker pick-ups reduce hum, hence the name, while single coil pick-ups are more prone to hum. To reduce hum, when using distortion pedals, switch to the humbucker pick-up if your guitar has one, or switch to two single coil pick-ups combined if your guitar has single coils. An example of a humbucker guitar is the Gibson Les Paul and a single coil guitar is the Fender Stratocaster.

Most BOSS guitar effects pedals only require a small current so several pedals can be used with only one BOSS power supply unit (PSU)

The BOSS PSA-240 regulated AC/DC power supply (PSU) specifications:

• Input voltage: 220-240v AC 50hz (This is the standard UK voltage)
• Output voltage: 9v DC 200mA regulated
• Output connector polarity: centre female socket negative (-) and outside positive (+)

For help with finding the right power supply information, view our
Power Supply Units Polarity Information