Hi hopefully someone can help me out here:)


if a synth/drum machine/keyboard etc has a power input on the back of it saying DC INPUT , i use an AC or a DC adaptor?

i would have thought DC yet i am constantly finding manuals and other sources telling me AC.

the 3 units im tryna suss out here are,

Roland MC-202 -

ive read that i should use a Boss PSA-240 9v 200ma AC adaptor. i have one and it makes unwanted noise on the signal.

i also have used (and it works fine) a generic 9v
180ma DC adaptor.



Roland PMA-5 -

has a DC input but the manual asks for a PSA series AC adaptor.


last but not least...

Roland TR-707 -

DC input 12v unsure of ma rating.


thankyou ;)