instructable on building mechanical diaphragm:
instructables.com/id/How-to-make-a-12-leaves-Mechanical-Irirs/
example of using speaker actuated vortex cannon thing:
youtube.com/watch?v=kf4UW2H5tsw
I figured combining the two would allow me to shoot small smoke rings through larger ones. So i had a mechanism lasercut that would allow me to actuate the diaphragm with a scavenged printer stepper motor through a microcontroller. The microcontroller also generates different envelope pulses for slow and fast rings. The gears sound awful but i left the sound in because i think the pulses sound kind of nice. Due to a 6-bit resistor ladder DAC the 'slopes' of the pulses are rather stair-like... MEEEP MEEEP :P

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