Fading Lasers without modulation, optically

[glorocks]

A 555 with an integrator might work as well.
J

[absolom7691]

This is how I did mine. Not cheap but very effective although, it might be cheaper than a GM20 and if you want variable brightness on R, G, and B, you'd need a GM20 for each. For this, one board has 8 channels and all you'd need is an analog driver for each. The cool this is, I can program the cues in Beyond for a timeline "show" or operate it live via DMX board.

Found here: http://lasershowparts.com/store/inde...&productId=285

[AlicaReik]

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[Pockels]

Erm...

[steve-o]

Yet another rogue AI bot gone wild ..
Anyways .. Thanks for the suggestions on the triangle wave generator guys ! I appreciate it

[tribble]

Does this count as fewer than 7 parts?

https://www.sparkfun.com/products/11420

This is the MiniGen Signal Generator, a small shield for the Arduino Pro Mini that is capable of generating sine, square, or triangle waves at up to 3MHz, and approximately 1Vp-p. Though the MiniGen is technically a shield it can, in fact, operate as a stand-alone board capable of the the same functionality as it would if it were placed on top of a Pro Mini.

If you add an opamp buffer you'll probably come up to 7.

[Pangolin]

Guys, this is a bit funny. Just take one of our actuators, mount an arm on it, and a mirror on the end of the arm. As the actuator brings the mirror into the beam (for example at a 90 degree angle), the mirror then directs the beam to the effect (of your choice). If the mirror is brought partially into the beam, then it directs only a part of the beam to the effect.

Laser Medid did this back in the mid '80s and it will still work today.

Our little 506 actuator moves an actuator arm 20 degrees with only a 5 volt input. Less voltage equals less deflection and less of the beam through the effect of your choice.

Bill

[planters]

The problem with doing this electrically will be the nonlinear response of the DPPS (if any). This also applies to any variable filter as well. The gradual interruption as Bill describes should probably be done with a mirror that shows little change in it's reflectivity with angle such as a metal coated mirror or a specifically coated broad band like CVI's Maxbrite (expensive).

[laserist]

Bill was talking about a mirror perpendicular to to actuator - there's no rotation of the mirror relative to the beam.

The problem with doing this electrically will be the nonlinear response of the DPPS (if any). This also applies to any variable filter as well. The gradual interruption as Bill describes should probably be done with a mirror that shows little change in it's reflectivity with angle such as a metal coated mirror or a specifically coated broad band like CVI's Maxbrite (expensive).

[planters]

Yes, now rereading his suggestion that is clearly what he meant. I....must...slow...downnnn.