Step 1: Parts & Tools
A) two shallow wooden salad bowls -- available everywhere. I would recommend getting them secondhand at a Goodwill or Salvation Army. Try to get flat bottom bowls that are around 1/4" thick and carved from a single piece of wood. Avoid bowls with a ridge around the base.
B) two piezo discs -- these will cost about a buck apiece at any electronics shop. Get the largest ones you can find (the ones shown are about an inch and a half in diameter). If the piezos have any plastic housing or wiring, remove it. You will only need the discs themselves.
C) two electro-mechanical transducers -- these are basically the magnetic drivers of speakers without the diaphragm (cone). Whatever you attach them to becomes the diaphragm, in this case the bowls themselves. I like using either Vidsonix Phantoms (for larger bowls and lower frequencies) or Vidsonix Ghosts (for smaller bowls). They're less than $20 apiece from Vidsonix via their
D) an audio cable -- 1/8" stereo on one end and dual mono on the other (for example dual RCA as shown). This will connect the output of the ResoDrums to your computer (here assumed to have an 1/8" stereo jack). Alternately, you can make your own quite easily with just an 1/8" plug and some wire.
E) an audio cable -- to connect your computer's audio out to your amplifier's audio in (1/8" to 1/8" cable shown---your equipment may vary).
F) an amplifier -- a stereo audio amplifier that is 8 ohms and at least 15 watts (so just about any home stereo amp will do). Here I've used a class-D amp, which is small enough for easy transport.
G) 6 wood screws -- the screws that come with the transducer are too long (they will go all the way through the bowl). You will need shorter screws (about as long as the thickness of the bowl).
H) 6 washers -- these will distribute the pressure of the screws so you can tighten them without cracking the transducer's mounting plate. You'll want ones that are about the size of a quarter with a small hole in the middle.
I) spacers -- the cheap rubber bits with adhesive (available at any hardware or home furnishings store)
J) glue -- epoxy or jut plain superglue
K) a laptop -- mac or pc
L) a soldering iron & solder
M) pliers/wire cutters
N) a screwdriver
O) an awl
P) tape -- gaffer's tape is the best, but just about any tape will do the trick