9 Mar
2007
9 Mar
'07
1:50 p.m.
Randy Dawson wrote:
Popular Electronics had a lissajous figure generator project to attach
to a scope in XY mode. Just a couple of slowly frequency and amplitude
ramping sine wave oscillators. I always wanted to drive some XY servo
mirrors and put that on the wall for a laser light show.
Doesn't Helmholtz show a rig like this in his "On the Sensations of
Tone" (circa 1863)? No lasers (not even incandescent light), but a
mechanical mirror-equipped rig to look at Lissajous figures.
Oscillographs are much older than electronics.
Cheers,
Chuck