The **LPA-14PA-R** is an electronic component typically categorized as a **Piezoelectric Indicator** or **Audio Transducer (Buzzer)**. These parts are widely used in consumer electronics, medical devices, and industrial control panels to provide audible feedback or alarms. --- ### 1. General Specifications While specific data can vary slightly by manufacturer (often associated with brands like **Mallory Sonalert** or **Intervox**), the typical specifications for this series are as follows: | Parameter | Typical Value | | :--- | :--- | | **Type** | Piezo Indicator (with Internal Circuitry) | | **Operating Voltage** | 3V - 20V DC | | **Rated Voltage** | 12V DC | | **Current Consumption** | 8mA - 15mA (Max) | | **Sound Pressure Level (SPL)** | 85dB - 95dB at 10cm | | **Resonant Frequency** | 3,500 Hz ± 500 Hz | | **Tone Type** | Continuous | | **Mounting Type** | PC Pin (Through-Hole) | --- ### 2. Internal Components & Technology The "LPA" series utilizes **Piezoelectricity** rather than electromagnetic coils. Here is how the internal parts work: * **Piezoelectric Ceramic Disc:** A ceramic material bonded to a metal plate. When voltage is applied, the material physically deforms. * **Oscillator Circuit:** The "PA" suffix often denotes that it contains an **internal drive circuit**. This means you only need to apply a DC voltage to trigger the sound; you do not need an external AC signal. * **Resonant Chamber:** The plastic housing (usually PBT or ABS) is shaped specifically to amplify the sound waves generated by the disc. --- ### 3. Pinout and Installation The device features a simple two-pin interface: 1. **Positive (+) Pin:** Connected to the DC supply (e.g., a microcontroller GPIO pin or a power rail via a transistor). 2. **Negative (-) Pin:** Connected to Ground (GND). ```cpp // Example: Driving the LPA-14PA-R with an Arduino int buzzerPin = 9; void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { digitalWrite(buzzerPin, HIGH); // Sound ON delay(1000); digitalWrite(buzzerPin, LOW); // Sound OFF delay(1000); } ``` --- ### 4. Key Advantages * **Low Power Consumption:** Because it is piezo-based, it draws significantly less current than electromagnetic buzzers. * **Solid State:** No moving parts (like a striker), leading to high reliability and a long lifespan. * **Wide Voltage Range:** It can operate on both 5V logic and 12V industrial systems without requiring different components.