How to build a tattooing machine out of an old doorbell? Although meant to serve two extremely different purposes, the working principle behind these two devices is identical. To understand how a doorbell works, vist: http://home.howstuffworks.com/doorbell2.htm
In order to convert the buzzer into a tattooing machine, the clapper (arm) has to be mechanically connected to the tattooing needle. This way, the high frequency oscillations of the arm are transformed into a reciprocating motion of the needle.
In my design I fastened the coils and the tube clamp directly onto a piece of plywood. Most of the accessories like needles, tube, and tube clamp had been purchased online from one of the tattooing equipment suppliers.