Piezoelectric Sounder
A piezoelectric sounder is a device that uses the piezoelectric effect to generate sound. When an electric field is applied to a piezoelectric material (like PZT ceramic), it deforms mechanically, producing vibrations that create audible tones.
Key Features:
- Low power consumption
- Simple drive circuitry (often just a square wave)
- Available in various sizes and frequencies (common: 2–4 kHz)
- Two types: Indicator (with internal oscillator) and Transducer (external drive needed)
Typical Use: Alarms, timers, consumer electronics, and beep feedback.
Drive Tip: Use a transistor (e.g., NPN BJT) for microcontroller interfacing to protect GPIO pins.