The **AS05008MR-4-R** is a high-quality, miniature dynamic speaker manufactured by **PUI Audio**. It is part of their "Mobile Series," designed for compact electronic devices where space is limited but clear audio output is required. --- ### ## Technical Specifications The following table summarizes the key electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Speaker Type** | Dynamic, Permanent Magnet | | **Impedance** | 8 Ohms (±15%) | | **Rated Input Power** | 0.5 Watts (0.5W) | | **Maximum Input Power** | 0.8 Watts (0.8W) | | **Sound Pressure Level (SPL)** | 86 dB @ 0.5W / 0.1M | | **Resonant Frequency (Fo)** | 500 Hz (±20%) | | **Frequency Range** | 500 Hz ~ 20,000 Hz | | **Diaphragm Material** | Mylar (PET) | | **Weight** | ~1.6 grams | --- ### ### Key Internal Components 1. **Mylar Diaphragm:** The "MR" in the part number often signifies a Mylar cone. Mylar is moisture-resistant and durable, making it ideal for portable or outdoor electronics. 2. **Neodymium Magnet:** It utilizes a high-strength NdFeB (Neodymium) magnet to achieve high sensitivity and SPL despite its small physical footprint. 3. **Voice Coil:** A precision-wound copper coil attached to the diaphragm that interacts with the magnetic field to create sound waves. --- ### ### Physical Dimensions & Mounting * **Diameter:** 50mm (Approx. 2 inches). * **Depth/Height:** Very slim profile (typically around 8mm), designed for low-profile enclosures. * **Termination:** Usually features solder pads for direct wire attachment or spring contacts depending on the specific revision. --- ### ### Common Applications Due to its 8-ohm impedance and 0.5W power rating, this speaker is frequently found in: * **Handheld Radios:** Walkie-talkies and scanners. * **Medical Devices:** Monitoring equipment and glucose meters (for alerts/beeps). * **IoT Devices:** Smart home hubs or security panels. * **Industrial Panels:** Interface feedback and alarms. --- ### ### Integration Tips When designing a circuit for the AS05008MR-4-R, consider the following: * **Amplifier Matching:** Use a Class D audio amplifier for high efficiency in battery-powered designs. * **Enclosure Design:** Since this is a dynamic speaker, mounting it in a "baffle" or sealed back-box will significantly improve the bass response and prevent phase cancellation. * **DC Blocking:** Ensure your drive circuit includes a coupling capacitor to prevent DC current from heating up the voice coil.