We are cleaning out old stuff from my Mom's house. There was an old Yamaha keyboard (a cheap one) that I figured Kelly could use. Kelly said she would use it. It's probably 1980s vintage. It is small.
It runs on 6 C batteries or there is a power supply somewhere. I found a power supply which is 9 volts and 500ma. The device spec says it takes 9 to 12 volts DC in the jack but there is no mention of amps.
Will I blow it up experimenting with the power supply I found lying on the floor in the office?
I can just put batteries in it but it would be nice to be able to plug it in.
No, the mA shouldn't matter. I just hope 500 mA is enough to power the keyboard. Just think of mA as the max potential that the power supply could put out, not necessarily what the keyboard will draw. There was a conversation about this not too long ago on this message board. A bad comparison might be like plugging in something that draws less than 15 amps into your wall outlet, which will supply up to 15 amps before the circuit breaker trips (or fuse blows). It will only draw what it needs.
Perhaps google the make and model number. You may be surprised and even find the owners manual on pdf. I would guess it would be listed under specifications.
> We are cleaning out old stuff from my Mom's house. There was an old Yamaha keyboard (a cheap one) that I figured Kelly could use. Kelly said she would use it. It's probably 1980s vintage. It is small.
>
> It runs on 6 C batteries or there is a power supply somewhere. I found a power supply which is 9 volts and 500ma. The device spec says it takes 9 to 12 volts DC in the jack but there is no mention of amps.
>
> Will I blow it up experimenting with the power supply I found lying on the floor in the office?
>
> I can just put batteries in it but it would be nice to be able to plug it in.
As Joe says, the milliamps will not matter, as long as it's sufficient. I'm guessing 1/2 AMP (500ma) will be plenty for a small keyboard. Even if it isn't, it won't hurt anything. It would be just like putting weak batteries into it. Just make sure that your power supply is DC (not AC). A simple multimeter will tell you this (if the charger unit does not specify it.)
Thanks,
Output: DC 9V 500mA
