Description
The 12mm or 15mm Piezo Electric Buzzer Element is a bare piezoelectric diaphragm consisting of a ceramic layer bonded to a brass substrate, supplied with pre-attached tinned copper wire leads for immediate soldering or breadboard connection. Available in two standard diameters, these elements serve dual purposes: as acoustic transducers when driven by an external oscillator, or as vibration/impact sensors when used in reverse (the piezoelectric effect generates a voltage when the element is mechanically stressed).
The 12mm variant is optimized for a 9.0 kHz resonant frequency, while the 15mm variant resonates at 6.0 kHz . These frequencies are where the element produces maximum sound output for a given drive voltage. The tinned copper leads simplify integration into DIY electronics, electronic drum triggers, contact microphones, and simple alarm circuits.
Critical limitations: These elements do not produce sound with DC voltage alone—they require an AC signal or microcontroller-generated square wave at or near the resonant frequency. For best volume, the drive frequency must match the element’s resonance, 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 before connecting to a microcontroller ADC.
Features
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Two Standard Sizes: 12mm (9 kHz resonance) and 15mm (6 kHz resonance) for different acoustic and space requirements .
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Pre-Attached Tinned Copper Leads: Saves soldering time and simplifies connection to breadboards and PCBs.
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Dual Function: Can generate sound (with external drive) or detect vibration/impact (generating voltage).
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Low Power Consumption: Piezoelectric elements draw minimal current when driven.
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Thin Profile: Low-profile diaphragm construction fits into flat enclosures and drum pads.
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No EMI/RFI: Piezoelectric operation does not generate electromagnetic interference.
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RoHS Compliant: Lead-free construction for environmentally sensitive applications .
Technical Specifications
| Parameter | 12mm Variant (Murata 7BB-12-9 reference) | 15mm Variant (Murata 7BB-15-6 reference) |
|---|---|---|
| Diameter | 12mm | 15mm |
| Resonant Frequency | 9.0 kHz ±1.0 kHz | 6.0 kHz ±1.0 kHz |
| Resonant Impedance | 1 kΩ | 800 Ω |
| Capacitance (at 1kHz) | 8.0 nF | 10.0 nF |
| Operating Temperature | Verify with supplier | -10°C to +40°C (RS listing) |
| Termination | Tinned copper wire leads (verify with supplier) | Tinned copper wire leads (verify with supplier) |
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