I was messing around with some lens positioners from some PHR-803 sleds tonight. They have three degrees of freedom, in and out for focus, side to side, and tilt side to side for tracking. The coils are around 4 ohms, and the tilt axis drives pretty good with a couple tenths of a watt of audio from my amp, so I made a simple XY scanner out of two of them. I took the lens positioners off the sleds, soldered some wires to the tilt coil leads, removed the lenses, and glued some fold mirrors from some old sleds on where the lense were. I attached one positioner to the other so the mirrors were at a right angle to each other. Next I hooked one positioner up to the right channel, the other to the left channel. Don't crank the amp too much or you will let the smoke out of the coil. Aim the laser about 45 degrees to the first mirror so it bounces and hits the second mirror. The frequency response is a bit slow because of the mass of the mirrors, but it looks pretty cool. You could also get some nice Lissajous figures with two sine waves from a function generator. I will try some lighter mirrors when I find some.
I would insert some pics, but the form isn't letting me in for some reason....
I would insert some pics, but the form isn't letting me in for some reason....