I would like to know if it's possible to build a dynamo that instead of having an electrical current driven through a coil by movement of a magnet to generate electricity could be driven by ac to move the magnet or coil in a vertical motion instead. If so, (which logically it sounds possible to me), could it be made small enough with low enough energy requirements and take up small enough space to be practical to drive a tattoo needle in a tattoo machine? I'll be the first to admit I'm a complete physics newb but I'm searching for a way to make a very low vibration generating tattoo machine to help prevent repetitive strain injuries caused by the vibration of the machine. If I haven't searched the forum well enough, please feel free to tell me to get lost. :) I'm not looking for specifics but a nudge in the right direction(s) and theories to research would help me a lot. Thanks. Current magnetic tattoo guns operate very similar to a doorbell circuit http://www.one-school.net/Malaysia/...ics/electromagnetism/images/electric-bell.png I think this might be the right concept? http://www.faqs.org/patents/imgfull/20110286868_01 But obviously with a completely different application and concept, I'm wondering if the physics required are the same and if it could be made small enough as I only need the length of my oscillation to be in the range of 1/16 of an inch to 3/16 of an inch.