[sdiy] oscillating a plate

[cris at music-service.nl]

Thnx for replay,
is a steal plate about 12Kg and i make a construktion like a guilotine, 
the plate is fixed in one point (in the upper side).
i don't tried to make it oscillate with the power of the sound but with 
the resonant frequency, i tried to find the selfoscillating frequency of 
the material....
You give me different ideeas so i have now to experiment with it...
thx
cris