The **LPA-13P1W-R** is a specific model of an **Audio Indicator (Piezoelectric Buzzer)**. It is primarily used to provide audible feedback or alarms in electronic circuits. This component is known for its compact size, low power consumption, and reliability. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The following table highlights the core technical parameters of the LPA-13P1W-R: | Parameter | Specification | | :--- | :--- | | **Type** | Piezoelectric Indicator (Internal Circuitry) | | **Rated Voltage** | 12V DC | | **Operating Voltage Range** | 3V to 20V DC | | **Current Consumption** | ≤ 10mA (at Rated Voltage) | | **Sound Pressure Level (SPL)** | ≥ 80dB (at 10cm / 12V DC) | | **Resonant Frequency** | 4,000Hz ± 500Hz | | **Tone Type** | Continuous | | **Mounting Type** | Through-hole (Pins) | | **Housing Material** | PBT (Plastic) | --- ### 2. Key Features and Design * **Built-in Drive Circuit:** Unlike "transducers" which require an external oscillating signal, the LPA-13P1W-R is an **indicator**. This means it has an internal oscillator; you simply apply a DC voltage to the pins, and it produces sound. * **Piezoelectric Technology:** It utilizes a piezoelectric ceramic plate. When voltage is applied, the plate deforms and vibrates, creating sound waves. This is much more energy-efficient than electromagnetic buzzers. * **Compact Form Factor:** The "13" in the part number often refers to the diameter (approx. 13.8mm), making it suitable for space-constrained PCB designs. * **Polarity:** As a DC component, it is polarity-sensitive. The longer lead or the marking on the housing typically indicates the **Positive (+)** terminal. --- ### 3. Application Circuit Example To integrate this part into a microcontroller circuit (like an Arduino or ESP32), you typically use a transistor as a switch because the buzzer may draw more current than a GPIO pin can safely provide. ```cpp // Simple Arduino code to activate the buzzer int buzzerPin = 9; void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { digitalWrite(buzzerPin, HIGH); // Buzzer turns ON (Constant Tone) delay(1000); // Wait 1 second digitalWrite(buzzerPin, LOW); // Buzzer turns OFF delay(1000); // Wait 1 second } ``` --- ### 4. Common Use Cases * **Home Appliances:** Microwave beeps, washing machine alerts. * **Industrial Equipment:** Fault alarms and status indicators. * **Consumer Electronics:** Confirming button presses or low battery warnings. * **Medical Devices:** Patient monitors and portable diagnostic tools.