In article <
20050310192228.GB2891@...>,
Peter Johansson <
peter@...> wrote:
> Here's a thought on agitation: Find a gear motor that runs somewhere
> arround 30 RPM. Mount a disc perhaps 2-3 inches in diameter with an
> offset center to the motor. Mount underneath one edge of the tray.
> Might something like this do the trick?
How about sitting the tray on the cone edges of an old loudspeaker - say
about an 8". With a tone generator and an amplifier you could experiment
with different frequencies to see which produced the desired effect -
ultrasonic?