The **8AT-36-R** is an electronic component primarily classified as an **Electromagnetic Buzzer** (or Transducer). These components are widely used in consumer electronics, automotive alerts, and industrial equipment to provide audible feedback. --- ### Technical Specifications Below is a breakdown of the typical electronic characteristics for this series: | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Electromagnetic / Magnetic Transducer | | **Rated Voltage** | 1.5V - 12V DC (Model dependent) | | **Operating Voltage** | 1.0V to 15V DC | | **Current Consumption** | Max 30mA - 80mA | | **Sound Pressure Level (SPL)** | Min 85dB at 10cm | | **Resonant Frequency** | 2,700Hz ± 300Hz | | **Mounting Type** | Through-hole (DIP) or Surface Mount (SMT) | | **Operating Temp** | -20°C to +70°C | --- ### Key Electronic Features #### 1. Driving Mechanism The "AT" designation usually implies an **External Drive** (Transducer). Unlike a "piezo buzzer" that contains its own oscillating circuit, this part requires an external square wave signal to generate sound. - **Input Signal:** Requires a frequency matching its resonant frequency (e.g., 2.7kHz) to achieve maximum loudness. - **Circuitry:** Often driven by a NPN transistor or a MOSFET controlled by a Microcontroller (MCU). #### 2. Construction * **Coil:** An internal copper coil that creates a magnetic field when current passes through. * **Diaphragm:** A metal disk that vibrates rapidly toward and away from the electromagnet to create sound waves. * **Housing:** Usually made of PBT (Polybutylene Terephthalate) or high-temperature plastic to withstand wave soldering. #### 3. Polarity and Wiring As a magnetic device, it is **polar**. One lead is usually longer or marked with a "+" sign. Connecting it in reverse may result in lower sound output or damage to the internal coil over long periods. --- ### Implementation Example (Arduino/MCU) To use this part, you generally connect it through a switching transistor to protect your MCU pins: ```cpp // Basic code to drive the 8AT-36-R at 2.7kHz int buzzerPin = 9; // PWM pin connected to transistor base void setup() { pinMode(buzzerPin, OUTPUT); } void loop() { tone(buzzerPin, 2700); // Send 2.7kHz signal delay(500); noTone(buzzerPin); // Silence delay(500); } ```