The **WPT-14W2-R** is an electronic component primarily classified as a **Piezoelectric Transducer (Buzzer)**. It is designed to convert electrical signals into audible sound waves through the piezoelectric effect. --- ### ## Technical Specifications Below are the typical electronic characteristics for the WPT-14W2-R series: | Parameter | Specification | | :--- | :--- | | **Type** | Piezo Transducer (External Drive) | | **Operating Voltage** | 1.0 - 30.0 Vp-p | | **Rated Voltage** | 3.0 - 5.0 Vp-p | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Sound Pressure Level (SPL)** | Min. 80 dB at 10cm | | **Capacitance** | 12,000 pF ± 30% | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Through-hole (Pin type) | --- ### ## Internal Structure and Operation The device consists of several key layers that facilitate sound production: 1. **Piezoelectric Ceramic Disk:** The core element that expands and contracts when an alternating voltage is applied. 2. **Metal Diaphragm:** Usually made of brass or stainless steel, this vibrates along with the ceramic disk to move the air. 3. **Housing (Case):** A plastic resonance chamber (usually PBT or ABS) that amplifies the sound frequency to achieve the desired decibel level. 4. **Terminals:** Two pins for PCB mounting. --- ### ## Circuit Integration Since the WPT-14W2-R is a **transducer** (and not an indicator/active buzzer), it does not have an internal oscillation circuit. You must provide a square wave signal from a microcontroller (like an Arduino or STM32) to drive it. **Basic Implementation Example:** ```cpp // Example Arduino code to drive the WPT-14W2-R at its resonant frequency int buzzerPin = 9; void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { tone(buzzerPin, 4000); // 4kHz Square Wave delay(500); noTone(buzzerPin); delay(500); } ``` --- ### ## Key Features * **Low Current Consumption:** Piezo technology consumes significantly less power compared to electromagnetic buzzers. * **High Impedance:** Can often be driven directly by an MCU pin through a small current-limiting resistor. * **Slim Profile:** The "14" in the part number usually refers to a 14mm diameter, making it suitable for compact handheld devices.