The **AST-03208MR-R** is a high-performance, miniature dynamic speaker manufactured by **PUI Audio**. It is specifically designed for applications where high-quality sound output is required within a very compact footprint. --- ### ## Technical Specifications The following table summarizes the primary electrical and mechanical characteristics of the AST-03208MR-R: | Parameter | Specification | | :--- | :--- | | **Impedance** | 8 Ohms (±15%) | | **Rated Input Power** | 0.3 Watts | | **Maximum Input Power** | 0.5 Watts | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Sensitivity (SPL)** | 84 dB ± 3dB @ 0.1W/0.1M | | **Resonant Frequency** | 700 Hz (±20%) | | **Magnet Material** | NdFeB (Neodymium) | | **Diaphragm Material** | Mylar (PET) | | **Weight** | ~4.1 Grams | --- ### ## Key Features & Design 1. **Miniature Profile**: With a diameter of approximately 32mm and a very slim depth, it is ideal for handheld devices. 2. **Mylar Cone**: The use of Mylar (polyester film) makes the speaker resistant to humidity and environmental moisture, unlike traditional paper-cone speakers. 3. **Neodymium Magnet**: Provides high flux density in a small size, allowing for high sensitivity and efficiency without adding significant weight. 4. **Spring Contact/Solder Pads**: Usually features rear-side solder pads for secure wire attachment, though some variants support spring contacts. --- ### ## Common Applications Because of its broad frequency response (reaching up to 20kHz), this component is used for more than just simple beeps; it is capable of clear voice and melodic playback. * **Medical Devices**: Used in portable monitoring equipment for audible alerts and voice prompts. * **Industrial Controls**: Human-Machine Interfaces (HMI) where status feedback is required. * **Security Systems**: Keypads and alarm panels. * **Consumer Electronics**: Handheld scanners, walkie-talkies, and smart home gadgets. --- ### ## Implementation Considerations * **Back-Volume**: To achieve the best low-frequency performance (bass), the speaker should be mounted in a sealed or vented enclosure. Without an enclosure, "acoustic cancellation" occurs, significantly reducing volume. * **Drive Circuit**: Ensure the amplifier circuit does not exceed the 0.5W peak power rating to prevent voice coil burnout. * **Mounting**: The speaker should be mounted using a gasket to prevent "rattle" against the device chassis.