45 years ago I was in a bar in Chicago and they had a laser deal that
plotted the 2 channels of the sound system as a Lissajous pattern on
the back wall.
I tried to make one using an old Neon laser and mirrors on speaker
drivers about 40 years ago. It was almost working when the free used
laser I had crapped out. Now that laser diodes cost less than a stick
of gum I wanted to try again. What is the best way to steer the laser?
Piezo crystal or some kind of mirror solution
On Sun, 14 Jan 2018 22:08:32 -0500, firstname.lastname@example.org wrote:
My first laser disc player was an industrial unit that came out of a
"Dragon's Lair" upright video arcade game.
Inside of that was a HeNe laser tube on a mini light bench. It went
through two mirrors before hitting the splitter/read head. Both were
able to have their angle altered by the hardware They were 45 degree
mirrors on a pivot in the center and had a magnet and a coil behind
them. Electrical stimuluse in the coil moved the mirror.
I got a new, $2200 Pioneer LD player that year, so the old one
became a playtoy for me.
So, I piped a sine wave into one and music into the other and made
music patterns on the ceiling. It was not able to snap the trace back
like an oscope does, but it did make great signatures on the
So anyway, a few years back I bought two more players on ebay, and
they were only $30 each. I no longer have my LDs or the players.
But my point is you can likely find one of the old industrial
players and get the light table out of it. It already points up at
OR you need a mirror (two) with a pivot right behind the reflection
surface. Then a coil centered right over that pivot, and a magnet for
the coil to electro-motivate against. It has to be light in weight to
There are likely some pretty cheap didode laser light manipulators
out there already. I mean damn cheap. Most take music as a stimulus,
but I am sure single tone pure waveforms pumped into it would work
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