does anyone have a beam effect file that would drive an open loop scanner set?

[Vidal Wolf]

Ok.
Years ago I built an x-y scanner setup terminated with RCA jacks for a super simple lasershow demonstrator.
I used a couple signal generators to produce simple lissaajous and quadrature patterns.
does anyone have any pre made beam effect files that would run this?
the galvos are a couple of MFE R4-077 units that are set up in an x-y configuration. the ends are terminated with RCA connectors so I can connect them to a cheap amplifier output.
they are pretty slow.
Does anyone have some old show software or audio files that would make some simple beam effects they would be willing to share?
thanks in advance.
Nate.

[-bart-]

Don't know if it's the right speed for your application, so you might have to slow them down.
The effects are fairly symmetrical, so you don't have to worry about dc-coupling too much.
A low cut-off point of <<20Hz might be desirable though.

[mixedgas]

How about a amplifier improvement down to DC with damping. This is NOT a accelerator 124 type amp, but it works quite good with big open loop:

http://www.camtech.com/archive/A102_AX200.pdf

note the network of the galvo, 3 resistors, a capacitor, and a potentiometer that make a feedback signal that is the difference between the reactive load and the purely resistive load, while this really only works with galvos that have torsion bars, guess what, You have t bars in your R4s. The potentiometer provides damping, and you'll get stopped motion in less then 3 cycles of decaying oscillation if your mirrors are not too big. You might notice it during a show, but no one else will. (Well, they might if they are a control systems engineer...)

Steve

[Vidal Wolf]

Don't know if it's the right speed for your application, so you might have to slow them down.
The effects are fairly symmetrical, so you don't have to worry about dc-coupling too much.
A low cut-off point of <<20Hz might be desirable though.

Hey, thanks for those!
they were alot of fun to run thru the scanners. they did ok with them.
I really liked file #7 with the sweeping line swirling inwards to nothing.that was a cool effect. i wasnt sure that it could do much of anything, but it did ok.
Thank you again!
Nate.