Amazon.com: Piezo Contact Pickup, Piezo Patch Pickup With Volume & Tone Control Sound Effect Parts Universal Pickup Musical Instrument Accessory For Guitar Mandolin Violin Practice And Performance : Musical Instruments
Play a Melody using the tone() function | Arduino Documentation
Double Piezo with Volume/Tone/Jack Harness | Cigar Guitar Parts | MGB Guitars & Parts Supplier | MGB
C. B. Gitty's "Disc-o-Tone" Junior - Piezo Pickup Harness for Cigar Box Guitars - C. B. Gitty Crafter Supply
Large Piezo Alarm - 16 Tone - COM-13939 - SparkFun Electronics
Sound quality is poor using a piezo in TinkerCad - Arduino Stack Exchange