20mm Piezoelectric Diaphragm Disc Transducer with Lead Wires
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৳ 30.00৳ 50.00 (-40%)
This is a pack of premium 20mm piezoelectric diaphragm disc transducers designed for sound generation, vibration sensing, and acoustic pickup configurations [Image Context]. Each sensor consists of a circular brass substrate disc bonded with a high-sensitivity piezoelectric ceramic layer, pre-terminated with positive and negative wire leads [Image Context]. Operating on the direct piezoelectric effect, these discs function perfectly as acoustic guitar pickups, electronic drum triggers, vibration sensors for microcontrollers like Arduino, or ultra-thin buzzer elements.
Product Overview
The 20mm Piezoelectric Diaphragm Disc Transducer is a highly sensitive solid-state component engineered for both acoustic generation and physical impact detection [Image Context]. Operating on fundamental piezoelectric principles, this low-profile component functions as a dual-purpose device: it compresses mechanical stress (vibrations, knocks, or sound waves) into measurable electrical voltages, and conversely converts electrical signals into audible sound frequencies. Pre-wired for rapid prototyping, it serves as a foundational component for musical instrument pickups, electronic percussion triggers, and digital vibration sensor arrays.
Material Architecture & Operational Dynamics
The disc features a simple, robust construction engineered to maximize acoustic and kinetic conversion:
- Dual-Layer Composite Build: Consists of a thin, circular brass substrate base disc bonded with a concentric, specialized layer of piezoelectric ceramic material (typically lead zirconate titanate) [Image Context].
- Pre-Soldered Lead Interfaces: Outfitted with pre-terminated, flexible black (negative/ground) and red (positive/signal) hookup wire leads [Image Context]. The negative lead is anchored to the outer brass frame, while the positive lead is bonded directly to the silver-treated surface of the inner ceramic disc [Image Context].
- Bidirectional Energy Conversion:
- As a Sensor/Trigger: When subjected to an impact, bending force, or acoustic wave, the ceramic layer undergoes minor physical deformation, instantly creating a small voltage spike across the lead wires.
- As an Audio Generator: When driven with an alternating voltage or a square-wave frequency from a microcontroller, the ceramic layer expands and contracts rapidly, creating high-frequency sound pulses.
Technical Specifications
| Structural Component | Verified Specification Value |
|---|---|
| Product Category | Piezoelectric Ceramic Diaphragm Element / Transducer [Image Context] |
| Outer Base Metal | High-Conductivity Structural Brass [Image Context] |
| Resonant Frequency Range | Approximately 4.0 kHz to 6.5 kHz (Optimized for sharp alerts and mid-range audio) |
| Total Base Plate Diameter | 20.00 mm (0.787 inches) [Image Context] |
| Total Combined Thickness | Ultra-thin profile, typically ~0.20 mm to 0.45 mm |
| Wire Configuration Type | Pre-soldered positive (Red) and negative (Black) lines [Image Context] |
| Resistive Capacitance | ~10,000 to 15,000 pF at 1 kHz |
Common System Deployments
- DIY Acoustic Instrument Pickups: Taping or gluing the brass face directly onto the soundboards of acoustic guitars, cigar box guitars, ukuleles, and violins to function as a low-cost, low-noise contact microphone.
- Electronic Drum Trigger Pads: Mounting underneath the strike surfaces of mesh or rubber drum pads to catch physical drumstick hits and route those spikes to digital MIDI sound modules.
- Microcontroller Knock Sensors: Linking directly to analog input pins on Arduino, ESP32, or Raspberry Pi boards to serve as localized knock, vibration, or structural balance sensors.
- Ultra-Thin Audio Buzzers: Integrating into tight commercial enclosures—like digital watches, hand-held scanners, calculators, and toys—to deliver clear notification beeps.
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