The **UDS-15B-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) Buzzer** or an **Electromagnetic Audio Transducer**. It is widely used in consumer electronics, automotive dashboards, and medical equipment to provide acoustic feedback. --- ### 1. Key Technical Specifications The following table outlines the typical electronic parameters for the UDS-15B-R: | Parameter | Value / Range | | :--- | :--- | | **Type** | Magnetic / Electromagnetic | | **Rated Voltage** | 12.0 V | | **Operating Voltage** | 8.0 ~ 15.0 V | | **Current Consumption** | Max 40 mA | | **Sound Pressure Level (SPL)** | Min 85 dB (at 10cm) | | **Resonant Frequency** | 2400 ± 200 Hz | | **Coil Resistance** | 140 ± 15 Ω | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Functional Components The UDS-15B-R consists of several internal electronic and mechanical parts: 1. **Electromagnetic Coil:** A copper wire winding that creates a magnetic field when current passes through it. 2. **Permanent Magnet:** Provides a static magnetic field that interacts with the coil's field. 3. **Vibrating Diaphragm:** A thin metal disk that moves rapidly due to magnetic fluctuations, creating sound waves. 4. **Housing (LCP/PPS):** High-temperature resistant plastic casing designed to withstand SMT (Surface Mount Technology) reflow soldering. 5. **Terminals:** Gold-plated or tin-plated pads for soldering onto a PCB. --- ### 3. Circuit Integration Since the UDS-15B-R is an **electromagnetic transducer** (not a self-driven buzzer), it requires an external oscillating circuit to produce sound. It acts as an inductive load. #### Example Driver Circuit (Basic) ```cpp // Example: Driving the UDS-15B-R using a microcontroller (e.g., Arduino) // Requires a transistor (NPN) to handle the 40mA current. void setup() { pinMode(9, OUTPUT); // Connect to Base of Transistor via 1k resistor } void loop() { tone(9, 2400); // Output the resonant frequency (2400 Hz) delay(500); // Beep for 500ms noTone(9); // Silence delay(500); } ``` --- ### 4. Application Considerations * **Polarity:** Most UDS-15B-R units are polarized. Check for a "+" mark on the casing to ensure correct installation. * **Reflow Soldering:** Because it is an SMD part, it is designed for automated pick-and-place machines and can survive standard lead-free reflow profiles. * **Acoustic Port:** Do not cover the small hole on the top or side of the component, as this is where the sound is emitted. ---