The **LSMT2-10141-R** is a high-performance, surface-mount (SMD) magnetic transducer, commonly referred to as a magnetic buzzer. It is designed for compact electronic devices that require reliable audio signaling. --- ### 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Type** | Magnetic Transducer (External Drive) | | **Rated Voltage** | 1.5 Vp-p | | **Operating Voltage** | 1.0 ~ 2.0 Vp-p | | **Rated Current** | Max 80 mA | | **Sound Pressure Level (SPL)** | Min 85 dB @ 10cm | | **Resonant Frequency** | 2,730 Hz | | **Coil Resistance** | 5.5 ± 1.0 $\Omega$ | | **Operating Temperature** | -40°C to +85°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Key Electronic Components & Working Principle The LSMT2-10141-R operates on electromagnetic principles rather than piezoelectricity. Its internal construction includes: * **Permanent Magnet:** Provides a static magnetic field. * **Voice Coil:** A small copper winding that creates a fluctuating magnetic field when an AC signal is applied. * **Vibrating Diaphragm:** A metal disk (usually iron-based) that is attracted and released by the magnetic field, creating sound waves. * **Housing:** A heat-resistant LCP (Liquid Crystal Polymer) plastic casing designed to withstand reflow soldering temperatures. --- ### 3. Application Circuitry Unlike "indicators" which beep as soon as DC power is applied, this **transducer** requires an external oscillating circuit. #### Basic Driving Circuit Typically, a NPN transistor is used to switch the transducer. A diode is often placed in parallel to protect the circuit from back-EMF (voltage spikes). ```cpp // Example: Driving logic for a Microcontroller (MCU) void setup() { pinMode(BUZZER_PIN, OUTPUT); } void loop() { // Generate a square wave at the Resonant Frequency (2730Hz) tone(BUZZER_PIN, 2730); delay(500); noTone(BUZZER_PIN); delay(500); } ``` --- ### 4. Use Cases * **Consumer Electronics:** Wearables, smartwatches, and handheld devices. * **Medical Devices:** Portable monitors and glucose meters. * **Industrial:** Alarm systems and status indicators for compact PCBs.