Oh cool, that makes sense. I got a cheap pair of laser galvos off Ebay a while ago (ok long time ago) and built a simple epicycloid generator with them and a Parallax Propeller chip [1]. It was pretty trivial to work with, send it a voltage and poof the galvos moved.
Cool stuff. Much cooler than doing it with a scope and function generators!
I looked at galvos on eBay but I felt like I was cheating. I tried using mirror on a stepper motor shaft initially as a test but the scan rate was abysmal and it was a £3 stepper so it vibrated the bearings loose. Ended up widlerising it. I have a pile of DVD drives ready to be recycled though. They have the shafts, bearings, magnets and coils to make a galvo with. Plus some more lasers to play with. Current galvo ideas are based on:
[1] https://www.youtube.com/watch?v=wlc0lzUpPsw