The **AB-AV103-R** is a specific electronic component, typically categorized as a **Piezoelectric Transducer (Buzzer)**. It is widely used in consumer electronics, industrial alarms, and medical devices to provide audible feedback. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Core Specifications The AB-AV103-R is designed for high-efficiency sound output with low power consumption. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Piezoelectric Indicator (Internal Circuitry) | | **Operating Voltage** | 3V – 24V DC | | **Rated Voltage** | 12V DC | | **Current Consumption** | $\le$ 10 mA at 12V | | **Sound Output (SPL)** | $\ge$ 85 dB at 10cm | | **Resonant Frequency** | 3,000 Hz ± 500 Hz | | **Tone Type** | Continuous / Single Tone | | **Mounting Type** | Through-Hole (Pins) | --- ## 2. Technical Components & Materials The device consists of three primary internal electronic sections: ### A. The Piezoelectric Ceramic Element This is the heart of the component. It consists of a ceramic disc coated with a thin metal layer (usually silver). When a voltage is applied, the **Piezoelectric Effect** causes the ceramic to deform mechanically, creating sound waves. ### B. Internal Drive Circuitry Unlike a "Transducer" which requires an external AC signal, the **AB-AV103-R** is an **Indicator**. * It contains a built-in oscillation circuit. * When a steady DC voltage is applied, the internal circuit converts it into the frequency required to vibrate the ceramic element. ### C. Housing and Diaphragm * **Housing:** Made of PBT (Polybutylene Terephthalate) or ABS plastic, designed to act as an acoustic resonance chamber. * **Diaphragm:** A metal plate (often brass or stainless steel) that holds the ceramic element and helps amplify the sound. --- ## 3. Pin Configuration & Wiring The device is polarized and usually features two pins for PCB mounting: 1. **Positive (+) Lead:** Connect to the VCC/Supply voltage (3V-24V). 2. **Negative (-) Lead:** Connect to the Ground (GND). > **Note:** Since it has internal circuitry, reversing the polarity may prevent the device from sounding or potentially damage the internal oscillator. --- ## 4. Key Application Considerations * **Voltage vs. Volume:** The Sound Pressure Level (SPL) is proportional to the input voltage. At 3V, the sound will be significantly quieter than at 12V or 24V. * **Driving Method:** It can be driven directly by a microcontroller GPIO pin (if current is within limits) or via a simple NPN transistor switch for higher voltage supplies. * **Environmental Resistance:** The "-R" suffix often denotes **RoHS Compliance**, meaning it is manufactured without hazardous substances like lead or cadmium.