The **AT-13-R** is primarily identified as a high-quality **Piezoelectric Audio Indicator (Transducer/Buzzer)** manufactured by companies like *Ariose Electronics* or *PUI Audio*. It is widely used in consumer electronics for alarm and notification sounds. --- ### 1. Key Technical Specifications The electronic performance of the AT-13-R is defined by its low power consumption and high sound output. | Parameter | Typical Value | | :--- | :--- | | **Rated Voltage** | 3 - 12 Vp-p (Square Wave) | | **Resonant Frequency** | 4,000 Hz ± 500 Hz | | **Sound Pressure Level (SPL)** | ≥ 80 dB (at 10cm / 3Vp-p) | | **Capacitance** | 12,000 pF ± 30% | | **Operating Temperature** | -20°C to +70°C | | **Current Consumption** | ≤ 3 mA | --- ### 2. Physical & Mechanical Construction The "R" suffix often denotes **RoHS Compliance** or a specific **Radial** lead configuration. * **Housing Material:** Usually PBT (Polybutylene Terephthalate) or ABS plastic, providing heat resistance during soldering. * **Piezo Element:** A ceramic disc coated with a metal layer. When an oscillating voltage is applied, the disc vibrates (the piezoelectric effect), creating sound waves. * **Dimensions:** Typically ~13mm in diameter and ~7mm in height (hence the "13" in the part number). * **Mounting:** Through-hole pins for PCB (Printed Circuit Board) integration. --- ### 3. Circuit Integration Unlike an "Internal Drive" buzzer, the AT-13-R is an **External Drive** transducer. It does not contain an internal oscillator. #### Driving the Component To produce sound, you must provide a square wave at its resonant frequency (4.0 kHz). Below is a basic example of how to drive it using an Arduino/Microcontroller: ```cpp // Basic Arduino code to drive AT-13-R int buzzerPin = 9; // Connect to digital pin 9 void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { // Generate a 4kHz tone tone(buzzerPin, 4000); delay(1000); // Sound for 1 second noTone(buzzerPin); delay(1000); // Silent for 1 second } ``` --- ### 4. Application Areas Because of its small footprint and low current draw, it is found in: 1. **Handheld Devices:** Multimeters, scanners, and portable medical tools. 2. **Home Appliances:** Microwaves, washing machines, and security panels. 3. **Industrial:** Feedback beeps for control interfaces.