In article 4,
John Schutkeker wrote:

I'm designing a system for shattering wine glasses with high intensity
sound, but my design doesn't "feel" right to me, and I need somebody to
tell me if I've forgotten something important. I need an oscilloscope to
measure the resonant frequency of the glass and a frequency generator to
produce it. I need stereo speakers and a stereo amplifier powerful enough
to generate the sound to break the glass.

But how do I correctly get the signal from the frequency generator into the
stereo amplifier. Do I need a pre-amp, or do I just wire it straight in?
If I need a pre-amp, how do I spec it, on the outputs of the freq generator
and the input of the amplifier? What if I'm using a receiver with the pre-
amplifier and the amplifier built-in? Can I just use the pre-amp that was
intended for the turntable?

Most signal generators have a variable output. Set it to around 0.5 to
1.0 volts.

As others mentioned, breaking the glass could be difficult. You'll need
a glass with an extremely high Q; one that rings easily and loudly when
rubbed. You'll also need precision frequency tuning to resonate an
object with such a high Q. Most wine glasses won't break before your
ears do.