## Overview of LPA-13P3W-R The **LPA-13P3W-R** is a specific model of a **piezoelectric buzzer** (also known as a transducer). It is an audio signaling device widely used in electronics to provide audible alerts, alarms, or feedback. --- ### 1. Key Technical Specifications Below are the typical electrical characteristics for this component: | Parameter | Specification | | :--- | :--- | | **Type** | Piezoelectric Transducer | | **Operating Voltage** | 1 ~ 20 Vp-p | | **Rated Voltage** | 3 Vp-p | | **Current Consumption** | ≤ 2 mA (at rated voltage) | | **Sound Pressure Level (SPL)** | ≥ 75 dB (at 10cm) | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Operating Temperature** | -20°C to +70°C | | **Mounting Type** | Through-hole (Pins) | --- ### 2. Functional Components The "13P3W" nomenclature generally breaks down into its physical and electrical properties: * **Piezo Ceramic Element:** The core of the device. When an oscillating voltage is applied, the ceramic disk vibrates, creating sound waves. * **Housing:** A plastic (usually PBT) casing designed to act as a resonant chamber to amplify the sound produced by the piezo element. * **Terminals:** Two metal pins for PCB mounting. --- ### 3. Circuit Integration Unlike an "active" buzzer, the LPA-13P3W-R is a **passive transducer**. This means it does not have an internal oscillation circuit. To produce sound, you must provide a square wave signal from a microcontroller (like an Arduino or ESP32). #### Sample Connection (Arduino) ```cpp // Simple code to drive the buzzer at its resonant frequency void setup() { pinMode(9, OUTPUT); // Connect Buzzer Pin to Digital Pin 9 } void loop() { tone(9, 4000); // Send 4kHz signal delay(1000); // Sound for 1 second noTone(9); // Silence delay(1000); } ``` --- ### 4. Distinctive Features 1. **Low Current Draw:** Because it is piezo-based, it consumes significantly less power than magnetic buzzers, making it ideal for battery-operated devices. 2. **Slim Profile:** The "13" usually denotes a ~13mm diameter, allowing for compact PCB layouts. 3. **High Frequency:** It is optimized for 4kHz, which is a sharp, piercing frequency highly audible to the human ear.