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Been playing around with getting a sweep image. This is what I got - see video. I can use a joystick to sweep the image back and forth, but I cannot figure out how to get the image to undulate - see attached Laserium video. If I add any additional oscillators the image just wiggles or twists but...

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Here is a tale from a topographic ocean:

Hmmm... You have a laser projector with 12 blue pots on the galvo driver board, and you've jumped to the conclusion the problem is one of those blue pots because - wait - you didn't mention why. I'd like you to pretend that you haven't actually already jumped to the perfect solution and convince...

Kvant CLUBMAX 3000/Disco Lens included: Asking $2000.00 X-Laser Mobile Beat Max, 2 units available: Asking $600.00 ea. Need to move so price reduced, reasonable offers considered.

I'm sad I won't be able to attend this year, but I will try to come in 2025. If anyone wants to build a virtual presence robot, I would happily attend virtually. :) Hopefully another Liberation user can show off the project's progress, especially now with Windows support. It was a big hit at...

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Interesting. Since I used a seperate +- ramp for my AM signal I have something that is similar to but not diamond spirals. Thank you.

The diamond spiral I created was just a guess after reading your post earlier. My function generator has 2 outputs so I created that pattern. I still have the build the boards that DZ provided to get a good AM signal source instead of using the function generator. Thanks for the info on the...

Nice find in the scope images. Ok that sounds good. Let me play with the caps and op amps and see what turns up. Thank you.

Laserium's spiral ramp was a 0-10V signal. While you could use a +-10V ramp with 4 quadrant multipliers the image would invert in both axes as the ramp went negative. It would be an interesting look, but inverting a +-10V ramp wouldn't lead to diamond spirals...

Oh sorry. Yes, it is 10K. I'm inclined to pull the board and inspect to confirm the circuit matches, as something doesn't seem right about how the offset voltage happens after the invert. But maybe I'm second guessing myself. I'll check it as time permits.

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Greg, just curious, is the DC Offset pot value also 10K like the AM and Sweep Gain pots, to ensure light loading by the op amp's 100K input resistors?

X and Y are +-10V signals from your cycloid generator of choice. AM, usually a ramp, is a +-10V control voltage signal that in this case goes to the AD633 four quadrant multipliers. Inverting the AM signal to either the X axis or the Y axis results in the "diamond" effect. I looked at your video...

Just a guess on where to look (if this is the KQO circuit) : Bad op amp or its PSU/Gnd connection(s) Bad 15v power supply connection(s) reply edited since 1st post I just took another look at your scope photos and now noticed that in the first photo the Ch1 and Ch2 signals are at the same...

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