SET UP. AB C

EF

D G

HI J

MATERIALS

[NOT SHOWN]

TOOLS

Epoxy putty

[A] Copper foil less than 1" square and ~0.001" thick. I got a roll from online metals.com. You can also use copper tape if you can remove all the adhesive.

[D] Wire Use stranded 22-gauge in multiple colors for circuit board, and solid 30-gauge for connections.

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[E] Sub-mini toggle switches, SPST ( 1) and DPDT ( 1)

Small adhesive plastic feet ( 3)

Soldering equipment, flux, desoldering braid

[ON BREADBOARD]

Snap-off knife or hobby knife with extra blades

[B] Piezoceramic
wafer material at least
2. 5"×0.4"×0.0105" thick.
I used a 2. 85" square
plate of type 5A4E lead
zirconate titanate (PZT)
from piezo.com. Some
piezoceramic vendors will
custom-cut pieces to your
dimensions, but I cut my
own with a razor knife.
For extreme precision you
could use a diamond saw,
if available.

[F] 9V batteries and snap connectors ( 4)

M324 operational amplifier chip

Resistors: 100Ω ( 2), 1kΩ ( 2), 10kΩ ( 3), 10MΩ ( 1)

Small pane of glass or other good cutting surface

[G] Aluminum beam, 11. 8"×0.6"× ~0.065"

Pencil and marker

[H] 5-minute epoxy

Capacitors: 4.7μF ( 2), 22μF ( 1), 680μF ( 1)

Ruler and straightedge

[I] 1½" male threaded ½" galvanized pipe with matching cap from a hardware store

Fine sandpaper

Trimpot (variable resistor), 1MΩ multi-turn

Rubber gloves

16-pin IC socket

Multimeter

[J] 5-hole outlet box with ½" inlet from a home or hardware store

Hammer and center punch

[C] Breadboard, 2× 2

Drill and drill bits

Make: 137