The **AST-02308MR-R** is a specialized audio component manufactured by **PUI Audio, Inc.** It is classified as a miniature dynamic speaker designed for compact electronic devices. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Type** | Dynamic Speaker (Moving Coil) | | **Shape** | Square | | **Dimensions** | 23mm x 23mm | | **Depth** | 8.3mm | | **Impedance** | 8 Ohms (±15%) | | **Power Rating** | 1.0W (Nominal) / 1.5W (Maximum) | | **Frequency Range** | 300 Hz ~ 20,000 Hz | | **Sensitivity** | 86 dB (at 1W/0.5m) | | **Magnet Material** | NdFeB (Neodymium) | --- ### 2. Key Electronic Parts & Construction The "AST" series utilizes a standard dynamic transducer architecture optimized for small footprints: * **Voice Coil:** A precision-wound copper coil that reacts to the audio signal's current. * **Neodymium Magnet:** Provides a high magnetic flux density in a small size, allowing for high sensitivity despite the small 23mm frame. * **Mylar/Paper Diaphragm:** The cone is typically made of lightweight materials to ensure fast transient response and clear mid-to-high frequency reproduction. * **Termination:** Usually features solder pads for direct wire attachment to a PCB or housing. --- ### 3. Application Use Cases This part is commonly found in industrial and consumer electronics where space is limited but audible alerts or voice prompts are required: * **Handheld Terminals:** Scanning devices or mobile POS systems. * **Medical Instrumentation:** Audible alarms for monitors or diagnostic tools. * **Security Systems:** Control panels and intercoms. * **IoT Devices:** Smart home hubs requiring voice feedback. --- ### 4. Integration Considerations When designing a circuit for the AST-02308MR-R, keep the following in mind: 1. **Amplifier Matching:** Ensure your audio amplifier is stable at **8 Ohms**. A Class-D amplifier is often used for efficiency in battery-powered devices. 2. **Enclosure Design:** Because this is a dynamic speaker, the "back-wave" must be isolated. Mounting it in a sealed or ported enclosure will significantly improve the bass response and prevent phase cancellation. 3. **Polarity:** Note the (+) and (-) markings on the solder pads to ensure correct phase, especially if using multiple speakers.