hey all, ill start you off with what im trying to make here... im tryting to make a galvanometer.. 2D. im trying to make a galvanometer so i can bounce a laser off a mirror mounted on it. then use the mirror to create laser patterns. first of all, does anybody know where i can buy a cheap one?not some ancient one......(there all over the internet) im trying to make it simple by finding one that can move in 2 dimensions. up down, and sideways. my orignal plan was to use a speaker and mount a mirror on it. (not those crappy kind that you just stick a piece of tin foil on the cone and "let her rip" i've made a series of designs incuding mounting a wire used in model airplanes for the rudders. then sticking one end of the wire on the cone, then the other on the middle of one side of a hunk of square aluminum that is being supported by a piece of fuel line tubing fromt the local hobby shop. then do the same process with another speaker but for the other side of the aluminum. mount a small mirror in the middle of the piece of aluminum and shine a laser on the mirror. after i supposedly get this to work i would create a program to write the complex sound files for the speakers to move the mirror in 2D in a defined pattern. one problem is that the speakers have a degree of inaccuracy and anything i build that is mechanical (brass parts, etc.....) there is some inaccuracy in the movement of the parts. another thing i tried was to mount a brass bar across the top of a speaker (in front of the cone) and then mount one side of the mirror to the cone and the other make it pivot on a stationary point.:surprised .....aaah just look at the picture.... does anybody know of this trying to be done before? input anybody? i'd very much appreciate you advice and or help on this matter.