The **AC208-DS03-R** is a specific electronic component, typically categorized as a **Surface Mount (SMT) Buzzer** or an **Electromagnetic Audio Indicator**. It is designed to provide acoustic feedback in electronic circuits. --- ## 1. Technical Specifications The following table highlights the core electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Transducer Type** | Electromagnetic (Magnetic) | | **Mounting Type** | Surface Mount Device (SMD/SMT) | | **Rated Voltage** | 3.0 Vp-p (Typical) | | **Operating Voltage** | 2.0 ~ 5.0 Vp-p | | **Rated Current** | Max 100 mA | | **Resonant Frequency** | 2,731 Hz (Commonly 2.7 kHz) | | **Sound Pressure Level (SPL)** | Min 80 dB @ 10cm | | **Coil Resistance** | 17 ± 3 Ω | | **Operating Temperature** | -30°C to +70°C | --- ## 2. Key Internal Components The AC208-DS03-R functions based on electromagnetic induction. Its internal structure includes: 1. **Permanent Magnet:** Provides a static magnetic field. 2. **Voice Coil:** A winding of thin copper wire that creates a fluctuating magnetic field when an AC signal is applied. 3. **Vibrating Diaphragm:** A thin metal disk (often iron or a magnetic alloy) that is pulled and released by the magnetic field, creating sound waves. 4. **Housing:** A heat-resistant plastic (usually LCP or PPS) designed to withstand the high temperatures of reflow soldering. --- ## 3. Circuit Integration Unlike "indicators" which have internal circuitry to generate a beep, this is a **transducer**. This means it requires an external oscillating signal to produce sound. ### Driving Circuit Example To drive the AC208-DS03-R with a microcontroller (MCU), a simple transistor switching circuit is required: ```mermaid [MCU GPIO] ---- [Resistor] ---- [Base of NPN Transistor] | [Collector] ---- [Buzzer (-)] | [Buzzer (+)] ---- [VCC 3V] | [Emitter] ---- [GND] ``` --- ## 4. Application Use-Cases * **Consumer Electronics:** Feedback tones for household appliances (microwaves, washing machines). * **Medical Devices:** Alarm signals for portable monitors. * **Handheld Terminals:** Scanning confirmation beeps for POS systems. * **Automotive:** Warning chimes for dashboard interfaces. ---