>Has anyone else done this or know anyone working
>on it??
>-Roman


I cannot remember who did it, but I recall someone doing it with a piezo
feedback element attached to the voice coil.

On the other hand my work project is to attempt to emulate something very
similar consisting of a piston to pump helium gas in a cooler. The piston
moves about 4 to 5 mm at max movement, and has an LVDT attached to provide
positional feedback. The whole thing also gets bogged down in drying to
minimise the vibration of the mechanical unit to stop the satellite it will
be on from vibrating and spoiling the nice pretty pictures the camera will
be taking.

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