So don't just bolt it down but use some kind of rubber feet. When you mount the motor into a case, you might want do decouple it from the case so the sound of the motor doesn't get amplified by the case bottom. A 9V battery and a linear regulator like the LM317 will do the job your circuit will look very similar to this: Then your job is to tinker an mechanical connection to the crank of the music box and provide 6V to the motor. You will need an electric motor fitted with a simple gearbox: An example would be this one: I'm also pretty noob with electronics, so I'd prefer not having to put together my own circuit board or anything at most I'd like to just make a few solders and hook up the battery, then snap on a few widgets & gears and pump out those tunes. What kind of motor am I looking for? It should be relatively small, so I can fit it in the wooden music box I'm making along with the musical mechanism itself and whatever other contraptions I need to put it all together. So it doesn't take much torque to turn the crank, but it needs to be turned approximately 100-150 times per minute in order for the music to sound decent. I'd like to automate the crank with an electric motor, since I am under the impression that it's pretty hard to make your own wind-up music box (difficult to get the wind-up mechanism to turn at a constant rate, involves fans and other intricate timing mechanisms, etc). The thing sounds like crap for this reason alone. If you watch this video you can see that it has a serious design flaw: it has a tiny hand-crank, and it's thus next to impossible to play your custom tunes at a constant rate. I recently purchased a DIY music box kit from a website which I will not link to here.

Crank music box