Description
The PZT Piezo Buzzer Discs are bare piezoelectric ceramic elements mounted on a brass substrate, with pre-attached PVC-insulated copper wires for easy connection. Available in 12mm and 15mm diameters, these discs serve two primary functions: as acoustic transducers when driven by an external oscillator circuit, or as vibration/impact sensors when used in reverse (the piezoelectric effect generates a voltage when the disc is mechanically stressed).
Unlike self-driven buzzers that contain internal oscillator circuitry, these bare discs require an external drive signal. When driven at their resonant frequency (approximately 9.0 kHz ±1 kHz for the 12mm variant), they produce their maximum sound output. They are commonly used in electronic drum pads, knock sensors, simple alarms, and DIY audio projects where a thin, low-cost sound source or vibration sensor is needed. The PVC wire insulation provides basic protection and flexibility for routing in tight enclosures.
Critical limitations: These discs do not produce sound with a DC voltage alone—they require an AC signal or a microcontroller-generated square wave at or near the resonant frequency. Driving them with DC will not work. For best volume, the drive frequency must match the disc’s resonant frequency, and mounting in a small cavity/resonator will significantly increase sound pressure. For sensor use, the output is a small, high-impedance voltage spike that requires appropriate signal conditioning (e.g., a 1MΩ resistor and Zener diode clamp) before connecting to a microcontroller ADC.
Features
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Dual Function: Can be used as a sound generator (with external drive) or as a vibration/knock sensor (generating voltage when struck).
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12mm and 15mm Diameters: Compact sizes suitable for tight spaces and focused sensing areas.
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Pre-Attached PVC Wires: Saves soldering time and simplifies connection to breadboards and PCBs.
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Low Power Consumption: Piezoelectric elements draw minimal current when driven.
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Thin Profile: Low-profile disc construction fits into flat enclosures and drum pads.
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Resonant Frequency Operation: Designed for efficient sound output at approximately 9 kHz (12mm variant).
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No EMI/RFI: Piezoelectric operation does not generate electromagnetic interference.
Technical Specifications
| Parameter | 12mm Variant (documented) | 15mm Variant |
|---|---|---|
| Diameter | 12mm | 15mm |
| Resonant Frequency (Fs) | 9.0 kHz ±1 kHz | Verify with supplier |
| Resonant Impedance (Rr) | ≤500Ω | Verify with supplier |
| Capacitance (at 120Hz) | 11 nF ±30% | Verify with supplier |
| Operating Temperature | -20°C to +70°C | -20°C to +70°C (typical) |
| Storage Temperature | -30°C to +80°C | -30°C to +80°C (typical) |
| Wire Material | PVC-insulated copper | PVC-insulated copper |
| Wire Length | Approx. 7 cm | Verify with supplier |
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