We have found that a small piece of medium density foam improves the performance of the pickup over a large number of frequencies.(If you are familiar with circuitry, feel free to experiment with combinations of capacitors and resistors to cut undesired frequencies) Cut a piece of foam the same size of your piezo element and about 3/8" tall.On the other end of the shielded wire, connect the signal wire to the signal tab on the 1/4" audio jack and connect the shielding to the ground tab. On one end connect the signal wire to the center of the Piezo element and the ground/shielding to the metal/brass surface of the piezo element. Strip the ends of the shielded audio cable. You are now ready to solder the device together.
Bending the element may cause it to break or lose some of it's sensitivity. Be careful not to hurt the metal device inside. Now that you have the Piezo Buzzer, you need to carefully break it open and get out the piezo element.It will be attached to the inside of the guitar body, and, as the body vibrates, the sound will be turned into an electric signal by the Piezo buzzer element. This is exactly how we will use the Piezo Buzzer element in this project. If sound waves push and pull on the conductors, an electrical signal is created and can be output to an amplifier or recording device. The beauty of the Piezo element is that it also can be applied reversely. When a sinusoidal signal (audio) is applied, the conductors are pushed and pulled very quickly, creating sound waves. This in turn bends the metal conductor layers. When a voltage is applied across the crystal layer, the crystals pull on one side and push on the other. Piezo elements are made from two conductors separated by a layer of piezo crystals. Also note that you do not need a fully functional buzzer device. In other words, they are pretty cheap so go for a good one. (Radio Shack) Sometimes the Piezo Buzzer packages don't have that much information on them, but you want to find things as close as possible to the information listed on the "Specs:" page. You can find these for just a couple dollars at your local parts store. The heart of the pickup is a piezo buzzer element. The first step is to design and create your pickup.soldering iron, solder, wire strippers, hot glue gun, and hot glue a 1/4" audio jack (that can be mounted on the guitar body) 4.
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