The **AS04004PO-2-R** is a high-quality, miniature speaker manufactured by **PUI Audio**. It is specifically designed for applications where space is limited but clear sound reproduction is required, such as in handheld devices, scanners, and small electronics. --- ### 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Speaker Type** | Dynamic, Permanent Magnet | | **Impedance** | 4 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 @ 0.1W / 0.1M | | **Resonant Frequency (Fo)** | 500 Hz (±20%) | | **Dimensions** | 40mm x 28.5mm x 11.5mm | | **Mounting Type** | Flange Mount / Surface | --- ### 2. Physical Construction The "R" suffix in the part number often indicates RoHS compliance. The internal construction includes: * **Magnet Material:** Typically Neodymium (NdFeB), providing high magnetic flux in a small footprint. * **Diaphragm:** Often made of Paper or Mylar (Polyethylene Terephthalate) depending on the specific environmental rating, providing a balance between weight and stiffness. * **Frame:** Durable plastic or metal housing with integrated mounting holes for easy installation. --- ### 3. Connection and Integration Integrating this part into a circuit typically requires an audio amplifier circuit. Below is a simple conceptual representation of how it fits into an electronic system: ```text [Audio Source] -> [Pre-Amplifier/DAC] -> [Class D Amplifier] -> [AS04004PO-2-R] | (Powered by 3.3V-5V) ``` **Key Considerations for Design:** * **Amplifier Matching:** Ensure your amplifier is rated for a **4 Ohm load**. Using an amplifier designed only for 8 Ohms may cause the amplifier to overheat. * **Polarity:** The terminals are usually marked with (+) and (-) signs. Correct polarity is essential to ensure the speaker moves "outward" on the positive cycle, preventing phase cancellation in multi-speaker setups. * **Enclosure:** To achieve the best bass response and prevent acoustic short-circuiting, this speaker should be mounted in a sealed or ported enclosure. --- ### 4. Common Applications * **Handheld Scanners:** Providing audible feedback for barcode reads. * **Medical Instruments:** Alarm signals and voice prompts. * **IoT Devices:** Smart home hubs and notification systems. * **Kiosks:** Low-power audio instructions.