The **WPT-52A-R** is a specific electronic component, typically categorized as a **Waterproof Piezoelectric Transducer (Buzzer)**. These devices are designed to convert electrical signals into audible sound through the piezoelectric effect, featuring ruggedized housing for environmental protection. --- ## 1. Core Technical Specifications Below are the typical electrical and physical parameters for the WPT-52A-R series: | Parameter | Typical Value | | :--- | :--- | | **Operating Voltage** | 1.0 ~ 30.0 Vp-p | | **Rated Voltage** | 10.0 Vp-p | | **Current Consumption** | $\le$ 5 mA at rated voltage | | **Sound Pressure Level (SPL)** | $\ge$ 85 dB (at 10cm / 10Vp-p / 2.5kHz) | | **Resonant Frequency** | 2,500 Hz ± 500 Hz | | **Capacitance** | 25,000 pF ± 30% (at 120Hz) | | **Operating Temperature** | -20°C to +70°C | --- ## 2. Electronic Working Principle The WPT-52A-R operates based on **Piezoelectricity**. Here is the breakdown of its internal mechanics: ### A. The Piezo Element The heart of the device is a ceramic disk bonded to a metal diaphragm (usually brass or stainless steel). When an oscillating voltage is applied: 1. The ceramic material expands and contracts. 2. This causes the metal diaphragm to flex rapidly. 3. The displacement of air molecules creates sound waves at the frequency of the input signal. ### B. Drive Circuitry The "R" suffix often denotes a specific lead configuration or RoHS compliance. Unlike "indicators" (which have internal oscillators), this "transducer" requires an **external drive circuit** (such as a square wave from a microcontroller) to function. ```cpp // Example: Driving the Transducer using an Arduino/MCU void setup() { pinMode(9, OUTPUT); // Connect WPT-52A-R to Pin 9 } void loop() { tone(9, 2500); // Send 2.5kHz Square Wave delay(1000); // Sound for 1 second noTone(9); // Silence delay(1000); } ``` --- ## 3. Physical & Environmental Features * **Waterproof Rating:** The "WPT" prefix stands for **Waterproof Piezo Transducer**. It usually features a sealed top or a protective membrane to prevent water ingress into the piezoelectric chamber. * **Housing:** Typically made of Black PBT (Polybutylene Terephthalate) or ABS plastic, providing high chemical and heat resistance. * **Mounting:** Designed for PCB mounting via pins or lead wires (depending on the specific revision). --- ## 4. Common Applications * **Automotive:** Reverse sensors and dashboard alerts. * **Industrial:** Alarm systems for high-moisture environments. * **Appliances:** Sounders for washing machines or outdoor control panels. * **Medical:** Portable monitoring devices requiring sterilization-safe exteriors.