The **AS07708PS-3-WR-R** is a high-performance miniature loudspeaker manufactured by **PUI Audio**. It is part of their "Slim-Line" series, designed for applications where space is limited but high-quality sound output is required. --- ### ## Technical Specifications Below are the primary electronic and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Transducer Type** | Dynamic (Moving Coil) | | **Rated Power (Nominal)** | 3.0 Watts | | **Maximum Power** | 4.0 Watts | | **Impedance** | 8 Ohms ± 15% | | **Sound Pressure Level (SPL)** | 84 dB ± 3dB @ 1W/0.5M | | **Resonant Frequency (Fs)** | 300 Hz ± 20% | | **Frequency Range** | 300 Hz ~ 20,000 Hz | | **Dimensions** | 77mm x 8mm | | **Connection Method** | Lead Wires (WR denotes Wire) | --- ### ## Key Features and Construction 1. **Form Factor:** The "07708" in the part number signifies its dimensions (roughly 77mm length and 8mm width). This extremely narrow profile makes it ideal for mounting in the bezels of monitors or within thin handheld devices. 2. **Magnet Material:** It typically utilizes **NdFeB (Neodymium)** magnets. Neodymium provides a high magnetic flux density, allowing for a high power-to-size ratio. 3. **Diaphragm/Cone:** Often constructed from cloth or synthetic polymers to ensure durability and a wide frequency response range. 4. **Environmental Compliance:** The "-R" suffix indicates that the part is **RoHS Compliant**, meeting international standards for the restriction of hazardous substances. 5. **Water Resistance:** The "WR" in the suffix usually denotes a level of water resistance, often achieved through a specialized cone coating or gasket, making it suitable for outdoor or industrial environments. --- ### ## Typical Applications Due to its unique "strip" shape and 3W power rating, it is commonly used in: * **Digital Signage:** Providing audio in slim displays. * **Medical Devices:** Alarms and voice prompts in bedside monitors. * **Point-of-Sale (POS) Terminals:** Transactional audio feedback. * **Smart Home Appliances:** Voice assistants or UI sounds in refrigerators or thermostats. --- ### ## Integration Code Example When driving this speaker from a microcontroller (like an Arduino or ESP32), you should use an **I2S or Class-D Audio Amplifier** rather than direct GPIO pins, as the speaker requires up to 3W of power. ```cpp // Example: Basic Square Wave Tone (PWM) // Note: Use a transistor or amplifier circuit between MCU and Speaker const int speakerPin = 9; void setup() { pinMode(speakerPin, OUTPUT); } void loop() { // Play a 440Hz tone (A4) tone(speakerPin, 440); delay(1000); noTone(speakerPin); delay(1000); } ```