Tools

Wiring tools

Wire stripper
Needle nose pliers
Wire cutters

Soldering equipment

Soldering iron
Solder
Brass sponge
Tip cleaner

Cutting tools for cardboard/plastic sheet

Hot glue gun and glue sticks

Velcro-type fasteners

Materials

Full parts list is available at the end of the Tutorial

Materials Summary:

Kitronik Mono Amplifier kit part number 2165 (includes board, electrical components, battery pack, speaker, and 2-conductor cable)

Piezo-electric disk, 35 mm, with solder connection points

Potentiometer, rotary action, linear taper, 100 K Ohm with integrated SPST switch

Knob for potentiometer (optional)

2 AA batteries

Extra wire, 24 AWG, red, black, 1 or 2 other colors as available

Cardboard or plastic sheet to make a housing

Project details

When the piezo-electric element is fastened to a vibrating surface it picks up the vibrations and converts them to an electric signal. This signal goes to the amplifier circuit and out to a small speaker. A potentiometer (variable resistor) is used to control the gain on the amplifier and serves as a volume control for the output speaker.