![]() ![]() For example, you could purchase several different piezoelectric elements with different specifications, and compare their performance as pickup devices. There are several different experiments you could try with this project. In this project, you'll learn how to make a piezoelectric pickup for an acoustic guitar, using inexpensive components that you can find at your local Radio Shack store. ![]() Unlike a microphone, with a pickup you will not record extraneous sounds from elsewhere in the room, just the sound of the acoustic instrument in which the pickup is mounted. With a pickup, the vibrations of the instrument are transduced into an electric current, which is then amplified and recorded. The piezoelectric effect can also be used in electronic pickup devices for recording acoustic instruments. A preamplifier in the phono cartridge of the turntable amplified these tiny currents, which were then further amplified by the stereo amplifier so that we could hear the music through speakers. The pressure transferred to this second crystal creates tiny electric currents due to the piezoelectric effect. The sides of the groove exerted pressure on the stylus, causing it to move a lever which is attached to a second crystal. To play the signal back and hear the music, the record was spun on a turntable, and a diamond stylus on the end of the tone arm would ride through the groove. The audio signal was recorded in grooves cut into the records. Back in the day, before any of us had computers at home, we listened to music on vinyl records. ![]()
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