## Technical Overview: AS01308MR-2-R The **AS01308MR-2-R** is a high-performance, miniature dynamic speaker manufactured by **PUI Audio**. It is part of the "Mobile Series," designed specifically for compact electronic devices where space is limited but audio clarity is required. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Transducer Type** | Dynamic Speaker | | **Impedance** | 8 Ohms ± 15% | | **Rated Power** | 0.5 Watts | | **Maximum Power** | 0.8 Watts | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Sound Pressure Level (SPL)** | 84 dB @ 0.5W, 0.1m | | **Dimensions** | 13mm (Diameter) x 3.5mm (Height) | | **Mounting Type** | Surface Mount / Lead Wire | --- ### 2. Physical Construction & Materials The speaker is built with specific materials to ensure longevity and performance in small form factors: * **Magnet:** Neodymium (NdFeB). This provides a strong magnetic field relative to its size, allowing for high sensitivity in a thin profile. * **Diaphragm:** Typically made of Mylar (Polyethylene Terephthalate) or similar lightweight polymer to allow for fast response times and high-frequency reproduction. * **Frame:** High-temperature plastic/metal housing designed to withstand standard soldering temperatures. --- ### 3. Features and Benefits * **Compact Form Factor:** With a diameter of only 13mm and a thickness of 3.5mm, it is ideal for wearables and handheld devices. * **Broad Frequency Response:** Unlike simple buzzers, this is a full-range speaker capable of reproducing voice and music from 500 Hz up to 20 kHz. * **RoHS Compliant:** Meets environmental standards for lead-free electronic components. * **High Efficiency:** The 84 dB sensitivity ensures audible output even with low-power battery-operated circuits. --- ### 4. Common Applications Due to its size and audio fidelity, the AS01308MR-2-R is frequently found in: 1. **IoT Devices:** Smart home sensors and hubs requiring voice prompts. 2. **Medical Wearables:** Blood pressure monitors or glucose meters with audio feedback. 3. **PDAs and Handhelds:** Portable scanners and GPS units. 4. **Security Products:** Alarm panels and two-way communication intercoms. --- ### 5. Implementation Example (Basic Driving Circuit) To drive this speaker using a microcontroller (like an Arduino or ESP32), a simple transistor or a Class-D amplifier is required. ```cpp // Example: Generating a 1kHz tone for a notification int speakerPin = 9; // Connected to a transistor driving the speaker void setup() { pinMode(speakerPin, OUTPUT); } void loop() { tone(speakerPin, 1000); // Send 1KHz sound signal delay(500); noTone(speakerPin); // Stop sound delay(1000); } ```