23 Mar
2009
23 Mar
'09
11:55 a.m.
On Mon, Mar 23, 2009 at 2:30 PM, Randy Dawson <rdawson16 at hotmail.com> wrote:
You can use 2 orthogonally mounted speakers, and mirrors for a XY drive. ?some tinkertoy
sticks as levers to increase the displacement, mount the mirrors on the ends of the
sticks.
That is effectively the technique for the rig in the Scientific
American book I have.
It works fine for audio-frequency refresh rates, so it's good enough
for "Laser Floyd". It's not fast enough for complex arbitrary shapes
as with a LaserMAME.
It's also easy to drive the orthogonal speaker system - a stereo audio
amp and a stereo computer - even an Amiga... write code to generate a
canned set of phase relationships between the left and right channel -
convert it to your native audio format, and play it through your sound
hardware. You can work with analog function generators, but even 10+
year old computer hardware can drive a pair of speakers to draw
squiggly lines on the wall.
-ethan