Drum head coupled with an RLC circuit I'm thinking about the possibility of an electroacoustic drum that would be tuned with some kind of RLC circuit.
The drum head would have an electromagnet attached to its center, which would be directly above a small permanent magnet mounted firmly to the sides of the drum.  The electromagnet would be the inductor in an RLC circuit.
If I tuned the circuit to some physical mode of the drum head/electromagnet, would I get any coupling between the circuit and the physical drum?  Would it be enough to to alter the sound of the drum?
 A: The mass of the electromagnet attached to the drum would ruin the resonance, effectively killing any sound you'd hope to attain. You can check this by taping a small stone to the centre of your drum and hitting it.
What you're making is kind of a speaker. It may be possible to make it light enough not to damage the resonance, but not with a cheap off-the-shelf electromagnet. You may want to consider putting something thin and metallic on top of the drum and suspending an electromagnet beneath it. Experimenting with that may get you an interesting result.
A: This is only being posted as an answer because I cannot comment (not enough points yet?):
Mark Everitt is wrong... the simplest argument would be appealing to this explanation of a microphone:
http://www.ccmr.cornell.edu/education/ask/index.html?quid=1212
You can always evaporate masses to membranes and have them oscillate... this was in fact used in my research to study gravity at extremeley small length-scales.
That being said, yes you can couple a membrane to a circuit.  Check out the field of Optomechanics, which does this with laser cooling.
